WO2013125317A1 - 圧力センサ - Google Patents
圧力センサ Download PDFInfo
- Publication number
- WO2013125317A1 WO2013125317A1 PCT/JP2013/052122 JP2013052122W WO2013125317A1 WO 2013125317 A1 WO2013125317 A1 WO 2013125317A1 JP 2013052122 W JP2013052122 W JP 2013052122W WO 2013125317 A1 WO2013125317 A1 WO 2013125317A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pressure receiving
- receiving surface
- wall
- pressure
- liquid
- Prior art date
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/0007—Fluidic connecting means
- G01L19/0023—Fluidic connecting means for flowthrough systems having a flexible pressure transmitting element
Definitions
- the present invention relates to a pressure sensor that detects the pressure of a liquid.
- a pressure sensor has been used to detect the pressure of the liquid flowing in the flow path.
- a so-called single-port type is generally used in which a liquid is branched from a main flow path through which the liquid flows to a branch flow path, and the pressure of the branched liquid is detected.
- the single-port type pressure sensor has a problem that the branch pipe portion becomes a dead volume and a problem that the liquid staying in the branch pipe portion is deteriorated.
- an in-line type pressure sensor that detects the pressure of the liquid flowing through the main flow path without branching the liquid from the main flow path to the branch flow path.
- Patent Document 1 as a flow path in a housing of a pressure sensor, a first flow path that changes flow from a main flow path toward a liquid chamber provided with a pressure receiving portion, and a second flow that flows along the liquid chamber.
- an in-line type pressure sensor is disclosed that includes a third flow path that changes the flow direction from the liquid chamber toward the main flow path.
- the liquid outflow hole provided in the inner wall of the pressure sensor housing that defines the liquid chamber is closer to the center of the pressure receiving surface than the end of the pressure receiving surface including the pressure receiving portion. Is provided.
- bubbles or the like stay in the connecting portion connected to the pressure receiving surface of the inner wall of the housing, and the accumulated bubbles and the like flow out together and the flow rate of the liquid fluctuates.
- the pressure sensor according to the present invention has a pressure receiving surface in contact with the liquid, a pressure detecting portion that detects the pressure of the liquid with respect to the pressure receiving portion included in the pressure receiving surface, and a housing inner wall that defines a liquid chamber together with the pressure receiving surface.
- At least a part of the connecting portion to be used is an inner wall of the outflow hole, and the inner wall of the housing that is the inner wall of the outflow hole is adjacent to the portion that is the inner wall of the outflow hole. It protrudes outward of the liquid chamber from the inner wall of the housing.
- the inner wall of the housing that defines the liquid chamber together with the pressure receiving surface
- at least a part of the connecting portion connected to the pressure receiving surface is an inner wall of the outflow hole
- the inner wall of the outflow hole is The inner wall of the housing protrudes outward of the liquid chamber from the inner wall of the housing of the other connecting portion adjacent to the portion of the outflow hole. Accordingly, it is possible to suppress problems such as bubbles remaining in a connecting portion connected to the pressure receiving surface of the inner wall of the housing, and the retained bubbles and the like flowing together to change the liquid flow rate.
- the housing has an inflow channel for allowing the liquid flowing in from the outside of the pressure sensor to flow into the liquid chamber, and the inflow channel is connected to the pressure sensor.
- the liquid flowing in from the outside is allowed to flow into the liquid chamber without branching to another flow path.
- the liquid flowing from the outside of the pressure sensor is allowed to flow into the liquid chamber without branching to the other flow path, so that the branch pipe portion becomes a dead volume. And the problem that the liquid staying in the branch pipe portion is altered can be avoided.
- the pressure sensor according to the second aspect of the present invention is characterized in that the pressure receiving surface is substantially circular in plan view and satisfies the following conditional expression. ⁇ 0.5 ⁇ (r1 ⁇ r2) /r3 ⁇ 0.9 (1) here, r1: distance from the center of the pressure receiving surface to the end of the pressure receiving surface; r2: distance from the center of the pressure receiving surface to the center of the outflow hole, r3: distance from the center of the outflow hole to the inner wall of the outflow hole.
- the conditional expression (1) It was made to satisfy. By doing in this way, the space where a bubble etc. can stay in the connection part connected with a pressure receiving surface among housing inner walls can be reduced. As a result, it is possible to suppress problems such as bubbles remaining in the liquid chamber, and the bubbles remaining in the liquid chamber collectively flow out to change the liquid flow rate.
- the pressure sensor according to the second aspect of the present invention may be further configured to satisfy the following conditional expression. 0.5 ⁇ (r1-r2) /r3 ⁇ 0.8 (2)
- the inner wall of the portion that is the inner wall of the outflow hole is protruded outward of the liquid chamber from the inner wall of the housing of the other connecting portion, and the center of the outflow hole is the end of the pressure receiving surface. It is arranged at an appropriate position closer to the center of the pressure receiving surface than the portion. By doing so, it is possible to prevent the outflow efficiency of the liquid from the liquid chamber to the outflow hole from being deteriorated due to the center of the outflow hole being farther from the center of the pressure receiving surface than the end of the pressure receiving surface. it can.
- the pressure sensor according to a third aspect of the present invention is characterized in that the pressure receiving surface has a substantially circular planar view, and the pressure receiving portion has a substantially circular planar view and satisfies the following conditional expression: And r2-r3 ⁇ r4 ⁇ r1 (3) here, r1: distance from the center of the pressure receiving surface to the end of the pressure receiving surface; r2: distance from the center of the pressure receiving surface to the center of the outflow hole, r3: distance from the center of the outflow hole to the inner wall of the outflow hole, r4: distance from the center of the pressure receiving part to the end of the pressure receiving part.
- the pressure sensor according to the third aspect of the present invention satisfies the conditional expression (3) so that the end portion of the pressure receiving portion overlaps the outflow hole.
- At least a part of the connecting portion is an inner wall of the inflow hole, and the inner wall of the housing is a portion of the inner wall of the inflow hole. It protrudes outward of the liquid chamber from the other connecting portion adjacent to the portion.
- At least a part of the portion of the inner wall of the housing connected to the pressure receiving surface is an inner wall of the inflow hole, and the inner wall of the portion of the housing that is the inner wall of the inflow hole is It protrudes to the outside of the liquid chamber from the inner wall of the housing of the other connecting portion adjacent to the inner wall of the inflow hole. Accordingly, it is possible to suppress problems such as bubbles remaining in a connecting portion connected to the pressure receiving surface of the inner wall of the housing, and the retained bubbles and the like flowing together to change the liquid flow rate.
- the pressure sensor according to the fifth aspect of the present invention is characterized in that the center of the inflow hole, the center of the outflow hole, and the center of the pressure receiving surface are arranged on the same straight line.
- the center of the pressure receiving surface is arranged on a straight line connecting the center of the inflow hole and the center of the outflow hole, the liquid from the inflow hole to the outflow hole in the liquid chamber is arranged. Can be moved smoothly. As a result, it is possible to further suppress problems such as bubbles remaining in the liquid chamber, and the bubbles remaining in the liquid chamber collectively flow out to change the liquid flow rate.
- a straight line connecting the center of the inflow hole and the center of the outflow hole may be set as the vertical direction, and the outflow hole may be arranged above the vertical direction.
- the outflow hole since the outflow hole is disposed above the liquid chamber in the vertical direction, bubbles or the like having a lighter specific gravity than the liquid easily flow out of the outflow hole. As a result, it is possible to further suppress problems such as bubbles remaining in the liquid chamber, and the bubbles remaining in the liquid chamber collectively flow out to change the liquid flow rate.
- the housing further includes a first connecting portion to which a joint provided in a first pipe through which the liquid flowing into the pressure sensor flows is connected.
- a second connecting part to which a joint provided in a second pipe through which the liquid flowing out from the pressure sensor flows is connected, and from the outflow hole of the liquid chamber toward the same straight line as the second pipe.
- An outflow passage that changes a flow direction, and the inflow passage may change the flow direction from the same straight line as the first pipe toward the inflow hole of the liquid chamber.
- the inflow channel changes the flow direction of the liquid flowing in from the first pipe toward the inflow hole of the liquid chamber, and the outflow channel flows out of the outflow hole of the liquid chamber.
- the flow direction of the liquid is changed toward the second pipe.
- the first pipe and the second pipe are further arranged substantially in parallel with the pressure receiving surface, and the inflow channel is connected to the first pipe.
- a flow path that changes a flow direction from the same straight line toward a direction substantially orthogonal to the pressure receiving surface, and the outflow flow path is directed from the direction substantially orthogonal to the pressure receiving surface toward the same straight line as the second pipe line.
- the present invention it is possible to provide a pressure sensor in which bubbles and the like stay in the liquid chamber, and the accumulated bubbles and the like flow out together and the liquid flow rate fluctuates.
- FIG. 3 is a perspective AA ′ cross-sectional view of the liquid chamber 11 formed in the housing 14 of the first embodiment.
- FIG. FIG. 3 is a perspective AA ′ cross-sectional view of a liquid chamber 11 formed in a housing 14 of a comparative example of the first embodiment. It is a figure which shows the inflow hole 12b and the outflow hole 13a of the 2nd Embodiment of this invention, (a) is the top view seen from the housing upper direction to the centerline CL direction, (b) is A of (a). -A 'sectional view. It is sectional drawing which shows the internal structure of the pressure sensor of the 3rd Embodiment of this invention.
- FIG. 1 is a cross-sectional view showing the internal structure of the pressure sensor of the first embodiment.
- the pressure sensor 10 shown in FIG. 1 detects the pressure of a liquid such as a chemical solution that flows in from the first pipe P1 and flows out of the second pipe P2 through the liquid chamber 11.
- the liquid that flows in from the first pipe P1 flows into the liquid chamber 11 through the inflow channel 12, and flows out from the liquid chamber 11 through the outflow channel 13 to the second pipe P2.
- the 1st pipe line P1 and the inflow flow path 12 provided in the housing 14 are mutually connected by the 1st coupling C1.
- the 2nd pipe line P2 and the outflow flow path 13 provided in the housing 14 are mutually connected by the 2nd coupling C2.
- the housing 14 is provided with a first connecting portion 22 to which the first joint C1 is screwed and connected, and a second connecting portion 23 to which the second joint C2 is screwed and connected.
- the 1st pipe line P1 and the 2nd pipe line P2 are arrange
- the inflow channel 12 is a channel that changes the flow direction of the liquid from the same straight line as the first pipe P1 toward the center line CL direction substantially orthogonal to the pressure receiving surface 15 (described later) of the liquid chamber 11.
- the outflow channel 13 is a channel that changes the flow direction from the direction of the center line CL substantially orthogonal to the pressure receiving surface 15 (described later) toward the same straight line as the second pipeline P2.
- the housing 14 includes an inflow channel 12 through which liquid flowing in from the outside of the pressure sensor 10 flows into the liquid chamber 11, and an outflow channel 13 through which liquid flows out of the pressure sensor 10 from the liquid chamber 11.
- the inflow channel 12 allows the entire amount of the liquid flowing in from the outside of the pressure sensor 10 via the first pipe P1 to flow into the liquid chamber 11 without branching to other channels.
- the housing 14 has a housing inner wall 19 that defines the liquid chamber 11 together with a pressure receiving surface 15 described later.
- the housing inner wall 19 defines a space opened upward along the center line CL of the pressure sensor 10.
- the housing inner wall 19 includes a bottom surface 19a that is perpendicular to the center line CL and has a substantially circular plan view in the direction of the center line CL, and a side surface 19b that gradually switches from the bottom surface 19a in a direction parallel to the center line CL.
- the seat 17 is disposed above the inner wall 19 of the housing including the bottom surface 19a and the side surface 19b, and the pressure detection unit 20 is disposed above the seat 17.
- the pressure detection unit 20 includes a pressure detection element 21 and a sheet 17 that functions as a pressure receiving surface 15 that contacts the liquid in the liquid chamber 11.
- the sheet 17 is a sheet disposed so as to cover the entire space defined by the inner wall 19 of the housing, and functions as a protective sheet that prevents the pressure detection element 21 from coming into direct contact with a liquid such as a chemical solution.
- a sheet made of a fluororesin such as polytetrafluoroethylene (PTFE) is preferably used.
- a portion of the sheet 17 facing the liquid chamber 11 is a pressure receiving surface 15.
- the pressure receiving surface 15 is a surface in contact with the liquid when the liquid chamber 11 is filled with the liquid.
- the pressure receiving surface 15 includes a pressure receiving portion 16, and the pressure detecting element 21 detects the pressure of the liquid applied to the pressure receiving portion 16 from the liquid filled in the liquid chamber 11.
- the sheet 17 is substantially circular in plan view from the direction of the center line CL, and the pressure receiving surface 15 corresponding to the inner peripheral portion thereof is in contact with the liquid in the liquid chamber 11.
- the outer peripheral portion of the seat 17 is in contact with the housing 14. Similar to the seat 17, the pressure receiving surface 15 is substantially circular in plan view from the direction of the center line CL.
- a circular groove centered on the center line CL is dug in a part of the housing 14 in contact with the seat 17, and an O-ring 18 is disposed in the groove part.
- the O-ring 18 functions as a seal member for preventing the liquid in the liquid chamber 11 from flowing out.
- the pressure detection element 21 includes a diaphragm (not shown) in contact with the pressure receiving unit 16, and detects the pressure of the liquid applied to the diaphragm via the pressure receiving unit 16.
- Various elements such as a strain gauge can be used as the pressure detection element 21.
- the pressure detected by the pressure detection element 21 is transmitted to an external device (not shown) via the cable 24.
- a cylindrical pressing member 25 having a center line CL as a central axis is disposed on the pressure detection unit 20.
- a base 26 is disposed below the housing 14. The base member 26 and the pressing member 25 are fastened with screws 27 through screw holes 28 provided in the housing 14, so that the pressure detection unit 20 is fixed in close contact with the housing 14.
- FIG. 2 is a plan view when the sheet 17 is viewed from the liquid chamber 11 side in the direction of the center line CL.
- the center position of the circle corresponds to the center line CL, and the portion outside the center position from the pressure receiving surface 15 is in contact with the housing 14.
- the pressure receiving surface 15 corresponds to a part of the sheet 17 that contacts the liquid in the liquid chamber 11.
- the pressure receiving portion 16 is a portion to which a pressure detected by the pressure detecting element 21 is applied.
- the diaphragm (not shown) of the pressure detection element 21 is disposed in contact with the surface of the pressure receiving unit 16 that does not contact the liquid. Therefore, in the pressure receiving surface 15, the pressure of the liquid applied to the pressure receiving unit 16 is detected by the pressure detection element 21, and the pressure of the liquid applied to other regions is not detected by the pressure detection element 21.
- the pressure receiving portion 16 is substantially circular in plan view from the direction of the center line CL.
- the pressure detection unit 20 has the pressure receiving surface 15 in contact with the liquid, and detects the pressure of the liquid with respect to the pressure receiving unit 16 included in the pressure receiving surface 15 using the pressure detection element 21. Further, the housing 14 has a housing inner wall 19 that defines the liquid chamber 11 together with the pressure receiving surface 15.
- FIG. 3 is a diagram illustrating the inflow hole 12a and the outflow hole 13a of the first embodiment.
- 3A is a plan view seen from above the housing 14 in the direction of the center line CL
- FIG. 3B is a cross-sectional view taken along line AA ′ of FIG.
- FIG. 4 is a perspective AA ′ sectional view of the liquid chamber 11 formed in the housing 14 of the first embodiment.
- FIG. 3A is a plan view when viewed from above the housing 14 along the center line CL in a state where the pressure detection unit 20 is not disposed in the housing 14.
- FIG. 3A shows a state in which the sheet 17 is not disposed, but a portion corresponding to the pressure receiving portion 16 of the sheet 17 is indicated by a dotted line.
- the housing inner wall 19 is provided with an inflow hole 12 a through which fluid flows into the liquid chamber 11 and an outflow hole 13 a through which liquid flows out from the liquid chamber 11.
- r1, r2, r3, and r4 respectively indicate the following.
- r3 Distance from the center of the outflow hole 13a to the inner wall of the outflow hole 13a
- r4 Distance from the center of the pressure receiving portion 16 to the end of the pressure receiving portion 16
- FIG. 4 is a perspective AA ′ cross-sectional view of the liquid chamber 11 formed in the housing 14 of the first embodiment.
- the housing inner wall 19 includes a bottom surface 19a facing the pressure receiving surface 15; A bottom surface 19 a and a side surface 19 b for connecting the pressure receiving surface 15 and defining the liquid chamber 11 are provided.
- a portion indicated by reference numeral 30 in the side surface 19 b is a connecting portion connected to the pressure receiving surface 15.
- the connecting portion 30 is a part of the side surface 19b and exists at a distance of approximately r1 from the center line CL. As shown in FIG. 4, at the position where the outflow hole 13a is present, the connecting portion is the inner wall of the outflow hole 13a as indicated by reference numeral 30a. And the connection part 30a protrudes outside the liquid chamber 11 rather than the other connection part 30 adjacent to the connection part 30a.
- the outward direction is a direction from the center line CL toward the side surface 19b of the housing inner wall 19.
- FIG. 5 is a diagram illustrating the inflow hole 12a ′ and the outflow hole 13a ′ of the comparative example of the first embodiment.
- FIG. 5A is a plan view seen from above the housing 14 in the direction of the center line CL
- FIG. 5B is a cross-sectional view taken along the line AA ′ of FIG.
- FIG. 6 is a perspective AA ′ sectional view of the liquid chamber 11 formed in the housing 14 of the comparative example of the first embodiment.
- the connecting portion 30 is not the inner wall of the outflow hole 13a ′ even at the position where the outflow hole 13a ′ exists.
- the connecting portion 30 at the position where the outflow hole 13 a ′ is present has the same distance from the center line CL as the other adjacent connecting portions 30.
- the bubble B shown by FIG. 6 tends to stay. Then, when the bubbles B staying in the connecting portion 30 at the position where the outflow hole 13a ′ exists, the liquid flow rate greatly fluctuates.
- the connecting portion 30 connected to the pressure receiving surface 15 of the housing inner wall 19 that defines the liquid chamber 11 together with the pressure receiving surface 15 is the inner wall of the outflow hole 13a.
- the connecting portion 30a that is the inner wall of the outflow hole 13a protrudes outward of the liquid chamber 11 from the housing inner wall 19 of the other connecting portion 30 adjacent to the connecting portion 30a. Accordingly, it is possible to suppress problems such as bubbles remaining in the connecting portion 30 connected to the pressure receiving surface 15 of the inner wall 19 of the housing, and the remaining bubbles and the like flowing out together to change the liquid flow rate. it can.
- the inflow channel 12 allows the entire amount of the liquid to flow into the liquid chamber 11 without branching the liquid flowing in from the outside of the pressure sensor 10 to another channel. Therefore, the problem that the branch pipe portion becomes a dead volume and the problem that the liquid staying in the branch pipe portion is altered can be avoided.
- the aforementioned r1, r2 , And r3 are preferably in the relationship of the following conditional expression (1). ⁇ 0.5 ⁇ (r1 ⁇ r2) /r3 ⁇ 0.9 (1)
- conditional expression (1) it is possible to reduce the space in which bubbles or the like can stay in the connecting portion 30 connected to the pressure receiving surface 15 in the housing inner wall 19. As a result, it is possible to suppress problems such as bubbles remaining in the liquid chamber 11, and the remaining bubbles collectively flow out to change the liquid flow rate.
- the values of r1, r2, and r3 described above are in the relationship of the following conditional expression (2). 0.5 ⁇ (r1-r2) /r3 ⁇ 0.8 (2)
- conditional expression (2) the center of the outflow hole 13a is located farther from the center of the pressure receiving surface 15 than the end of the pressure receiving surface 15, and the liquid flows into the outflow hole 13a from the liquid chamber 11. It is possible to prevent the outflow efficiency from deteriorating.
- the values of r1, r2, r3, and r4 described above have the relationship of the following conditional expression (3). r2-r3 ⁇ r4 ⁇ r1 (3)
- conditional expression (3) it is possible to solve the problem that the end portion of the pressure receiving portion 16 does not overlap the outflow hole 13a and the area of the pressure receiving portion 16 cannot be sufficiently secured. Therefore, it is possible to provide the pressure sensor 10 that sufficiently secures the area of the pressure receiving portion 16 and improves the detection accuracy of the liquid pressure.
- the connecting portion 30 protrudes outward from the liquid chamber 11 even at the position where the inflow hole 12a exists.
- at least a part of the connecting portion 30 is the inner wall of the inflow hole 12a, and the housing inner wall 19 of the portion that is the inner wall of the inflow hole 12a protrudes outward of the liquid chamber 11 from the other connecting portion 30. It becomes.
- the center of the inflow hole 12a, the center of the outflow hole 13a, and the center of the pressure receiving surface 15 are arranged on the same straight line.
- the liquid is smoothly moved from the inflow hole 12a to the outflow hole 13a in the liquid chamber 11.
- problems such as bubbles remaining in the liquid chamber 11, and the retained bubbles and the like flowing together to change the flow rate of the liquid.
- the housing 14 of the first embodiment has a first connecting part 22 to which the first joint C1 is screwed and connected, and a second connecting part 23 to which the second joint C2 is screwed and connected.
- the inflow channel 12 is a channel that changes the flow direction of the liquid from the same straight line as the first pipe P1 toward the center line CL direction substantially orthogonal to the pressure receiving surface 15 (described later) of the liquid chamber 11. By doing in this way, even when the liquid chamber 11 is not arranged on the same straight line as the first pipeline P1 and the second pipeline P2, it is possible to appropriately distribute the liquid without providing a dead volume. .
- the first pipeline P1 and the second pipeline P2 are arranged substantially parallel to the pressure receiving surface 15, and the inflow channel 12 is the same as the first pipeline P1.
- the flow path changes the flow direction from a straight line toward a direction substantially orthogonal to the pressure receiving surface 15.
- the outflow passage 13 is a passage that changes the flow direction from the direction substantially orthogonal to the pressure receiving surface 15 toward the same straight line as the second pipe P2.
- the pressure sensor 10 according to the second embodiment is a modification of the pressure sensor 10 according to the first embodiment, and is the same as the pressure sensor 10 according to the first embodiment, except for the part specifically described below. Shall.
- the connecting portion 30 protrudes outward from the liquid chamber 11 at a position where the inflow hole 12a exists.
- the connecting portion 30 is prevented from protruding outward from the liquid chamber 11 at the position where the inflow hole 12a exists.
- FIG. 7 is a view showing the inflow hole 12b and the outflow hole 13a of the second embodiment.
- FIG. 7A is a plan view seen from above the housing 14 in the direction of the center line CL
- FIG. 7B is a cross-sectional view taken along the line AA ′ of FIG.
- the connecting portion 30 protrudes outward from the liquid chamber 11.
- the connecting portion 30 is prevented from protruding outward from the liquid chamber 11.
- the liquid flowing in from the inflow hole 12b flows out from the outflow hole 13a. Bubbles and the like mixed in the liquid are particularly likely to stay in the connecting portion 30 at the position where the outflow hole 13a exists. On the other hand, it is hard to stay in the connection part 30 in the position where the inflow hole 12b exists. Therefore, even if the connecting portion 30 does not protrude outward from the liquid chamber 11 at the position where the inflow hole 12b exists, it is rare that a problem of fluctuation in the liquid flow rate due to the retention of bubbles occurs. is there.
- the connecting portion 30 is prevented from protruding outward from the liquid chamber 11 at the position where the inflow hole 12b exists.
- the inflow hole 12b can be arrange
- the pressure sensor 10 according to the third embodiment is a modification of the pressure sensor 10 according to the first embodiment, and is the same as the pressure sensor 10 according to the first embodiment, except for a part specifically described below. Shall.
- the pressure sensor 10 In the first embodiment, a specific description of the installation position of the pressure sensor 10 is omitted. On the other hand, the pressure sensor 10 according to the third embodiment specifically specifies the installation position of the pressure sensor 10.
- FIG. 8 is a cross-sectional view showing the internal structure of the pressure sensor 10 according to the third embodiment of the present invention. Since the configuration of the pressure sensor 10 is the same as that of the first embodiment, the description thereof is omitted.
- the base 26 is fixed to the fixing member 40.
- the fixing member 40 is a member such as a wall surface or a support, and has a fixing surface 40a that can fix the base 26 of the pressure sensor 10 with a screw or the like.
- the fixed surface 40a is a surface parallel to the vertical direction, and when the base 26 of the pressure sensor 10 is fixed, the center line CL of the pressure sensor 10 is in a state perpendicular to the fixed surface 40a.
- the center of the inflow hole 12a, the center of the outflow hole 13a, and the center of the pressure receiving surface 15 are arranged on the same straight line, and the direction of the straight line coincides with the vertical direction.
- the liquid flows into the first pipeline P1 from below in the vertical direction and flows out to the second pipeline P2 above in the vertical direction.
- the outflow hole 13a is arranged above the inflow hole 12a in the vertical direction. Accordingly, in the pressure sensor 10 having such a configuration, bubbles or the like having a lighter specific gravity than the liquid easily flow out from the outflow hole 13a. As a result, it is possible to further suppress problems such as bubbles remaining in the liquid chamber 11 and the accumulated bubbles flowing out together and the liquid flow rate fluctuating.
- the present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the scope of the invention.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
Description
本発明に係る圧力センサは、液体に接する受圧面を有し、該受圧面に含まれる受圧部に対する液体の圧力を検出する圧力検出部と、前記受圧面とともに液体室を画定するハウジング内壁を有するハウジングと、を備え、前記ハウジング内壁には、前記液体室へ液体を流入させる流入孔と前記液体室から液体を流出させる流出孔とが設けられており、前記ハウジング内壁のうち前記受圧面に連結される連結部分の少なくとも一部分が前記流出孔の内壁とされており、該流出孔の内壁とされた部分の前記ハウジング内壁が、前記流出孔の内壁とされた部分に隣接する他の前記連結部分の前記ハウジング内壁よりも前記液体室の外方へ突出したことを特徴とする。
-0.5≦(r1-r2)/r3≦0.9 (1)
ここで、
r1:前記受圧面の中心から前記受圧面の端部までの距離、
r2:前記受圧面の中心から前記流出孔の中心までの距離、
r3:前記流出孔の中心から前記流出孔の内壁までの距離
である。
0.5≦(r1-r2)/r3≦0.8 (2)
r2-r3≦r4≦r1 (3)
ここで、
r1:前記受圧面の中心から前記受圧面の端部までの距離、
r2:前記受圧面の中心から前記流出孔の中心までの距離、
r3:前記流出孔の中心から前記流出孔の内壁までの距離、
r4:前記受圧部の中心から前記受圧部の端部までの距離
である。
以下、本発明の第1の実施形態の圧力センサを図面に基づいて説明する。図1は、第1の実施形態の圧力センサの内部構造を示す断面図である。
図2は、シート17を、中心線CL方向に液体室11側から視認した場合の平面図である。円形の中心位置が中心線CLに対応し、受圧面15よりも中心位置から外方はハウジング14に接する部分である。受圧面15は、シート17の一部分であって液体室11内の液体が接する部分に対応する。
図3において、r1、r2、r3、およびr4は、それぞれ以下を示す。
r1:受圧面15の中心から受圧面15の端部までの距離
r2:受圧面15の中心から流出孔13aの中心までの距離
r3:流出孔13aの中心から流出孔13aの内壁までの距離
r4:受圧部16の中心から受圧部16の端部までの距離
図4に示すようにハウジング内壁19は、受圧面15に対向する底面19aと、底面19aと受圧面15を接続して液体室11を画定するための側面19bとを有する。側面19bのうち、符号30で示した部分は、受圧面15に連結される連結部分である。
-0.5≦(r1-r2)/r3≦0.9 (1)
0.5≦(r1-r2)/r3≦0.8 (2)
条件式(2)を満たすようにすることで、流出孔13aの中心が受圧面15の端部よりも受圧面15の中心から遠い位置となって液体室11からに流出孔13aへの液体の流出効率が悪くなることを防止することができる。
r2-r3≦r4≦r1 (3)
条件式(3)を満たすようにすることで、受圧部16の端部が流出孔13aに重ならない位置となって受圧部16の面積を十分に確保できないという不具合を解消することができる。従って、受圧部16の面積を十分に確保して液体の圧力の検出精度を向上させた圧力センサ10を提供することができる。
次に、本発明の第2の実施形態について説明する。第2の実施形態の圧力センサ10は、第1の実施形態の圧力センサ10の変形例であり、以下に特に説明する部分を除いては、第1の実施形態の圧力センサ10と同様であるものとする。第1の実施形態では、流入孔12aが存在する位置において、連結部分30が液体室11の外方へ突出するようにした。それに対して、第2の実施形態では、流入孔12aが存在する位置において、連結部分30が液体室11の外方へ突出しないようにする。
次に、本発明の第3の実施形態について説明する。第3の実施形態の圧力センサ10は、第1の実施形態の圧力センサ10の変形例であり、以下に特に説明する部分を除いては、第1の実施形態の圧力センサ10と同様であるものとする。
<他の実施形態>
本発明は上述した実施形態に限定されることはなく、その要旨を逸脱しない範囲内において適宜変更することができる。
11 液体室
12 流入流路
12a,12b 流入孔
13 流出流路
13a 流出孔
14 ハウジング
15 受圧面
16 受圧部
17 シート
19 ハウジング内壁
20 圧力検出部
30 連結部分
30a 流出孔の内壁とされた連結部分
CL 中心線
Claims (10)
- 液体に接する受圧面を有し、該受圧面に含まれる受圧部に対する液体の圧力を検出する圧力検出部と、
前記受圧面とともに液体室を画定するハウジング内壁を有するハウジングと、を備え、
該ハウジング内壁には、前記液体室へ液体を流入させる流入孔と前記液体室から液体を流出させる流出孔とが設けられており、
前記ハウジング内壁のうち前記受圧面に連結される連結部分の少なくとも一部分が前記流出孔の内壁とされており、
該流出孔の内壁とされた部分の前記ハウジング内壁が、前記流出孔の内壁とされた部分に隣接する他の前記連結部分よりも前記液体室の外方へ突出したことを特徴とする圧力センサ。 - 前記ハウジングが、前記圧力センサの外部から流入する液体を前記液体室へ流入させる流入流路を有し、
前記流入流路が、前記圧力センサの外部から流入する液体を他の流路へ分岐させることなく前記液体室へ流入させることを特徴とする請求項1に記載の圧力センサ。 - 前記受圧面の平面視が略円形とされており、
以下の条件式を満たす請求項1または請求項2に記載の圧力センサ。
-0.5≦(r1-r2)/r3≦0.9 (1)
ここで、
r1:前記受圧面の中心から前記受圧面の端部までの距離、
r2:前記受圧面の中心から前記流出孔の中心までの距離、
r3:前記流出孔の中心から前記流出孔の内壁までの距離
である。 - 以下の条件式を満たす請求項3に記載の圧力センサ。
0.5≦(r1-r2)/r3≦0.8 (2) - 前記受圧面の平面視が略円形とされており、
前記受圧部の平面視が略円形とされており、
以下の条件式を満たす請求項1から請求項4のいずれか1項に記載の圧力センサ。
r2-r3≦r4≦r1 (3)
ここで、
r1:前記受圧面の中心から前記受圧面の端部までの距離、
r2:前記受圧面の中心から前記流出孔の中心までの距離、
r3:前記流出孔の中心から前記流出孔の内壁までの距離、
r4:前記受圧部の中心から前記受圧部の端部までの距離
である。 - 前記連結部分の少なくとも一部分が前記流入孔の内壁とされており、
該流入孔の内壁とされた部分の前記ハウジング内壁が、前記流入孔の内壁とされた部分に隣接する他の前記連結部分よりも前記液体室の外方へ突出したことを特徴とする請求項1から請求項5のいずれか1項に記載の圧力センサ。 - 前記流入孔の中心、前記流出孔の中心、および前記受圧面の中心が同一直線上に配置された請求項1から請求項6のいずれか1項に記載の圧力センサ。
- 前記同一直線を鉛直方向とし、前記流出孔を該鉛直方向の上方に配置したことを特徴とする請求項7に記載の圧力センサ。
- 前記ハウジングが、
前記圧力センサに流入する液体が流通する第1管路に設けられた継手が連結される第1連結部と、
前記圧力センサから流出する液体が流通する第2管路に設けられた継手が連結される第2連結部と、
前記液体室の前記流出孔から前記第2管路と同一直線上に向けて流れ方向を変える流出流路と、を備え、
前記流入流路が、前記第1管路と同一直線上から前記液体室の前記流入孔に向けて流れ方向を変えることを特徴とする請求項2に記載の圧力センサ。 - 前記第1管路および前記第2管路が、前記受圧面と略平行に配置されており、
前記流入流路が前記第1管路と同一直線上から前記受圧面に略直交する方向に向けて流れ方向を変える流路であり、
前記流出流路が前記受圧面に略直交する方向から前記第2管路と同一直線上に向けて流れ方向を変える流路であることを特徴とする請求項9に記載の圧力センサ。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP13751347.9A EP2818841B1 (en) | 2012-02-24 | 2013-01-31 | Pressure sensor |
KR1020147022947A KR101613479B1 (ko) | 2012-02-24 | 2013-01-31 | 압력 센서 |
US14/380,340 US9778128B2 (en) | 2012-02-24 | 2013-01-31 | Pressure sensor |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012-039195 | 2012-02-24 | ||
JP2012039195A JP5823888B2 (ja) | 2012-02-24 | 2012-02-24 | 圧力センサ |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2013125317A1 true WO2013125317A1 (ja) | 2013-08-29 |
Family
ID=49005508
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2013/052122 WO2013125317A1 (ja) | 2012-02-24 | 2013-01-31 | 圧力センサ |
Country Status (5)
Country | Link |
---|---|
US (1) | US9778128B2 (ja) |
EP (1) | EP2818841B1 (ja) |
JP (1) | JP5823888B2 (ja) |
KR (1) | KR101613479B1 (ja) |
WO (1) | WO2013125317A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10215597B2 (en) | 2014-01-17 | 2019-02-26 | Alphinity, Llc | Fluid monitoring assembly with sensor functionality |
US10267701B2 (en) | 2013-10-30 | 2019-04-23 | Alphinity, Llc | Fluid monitoring device with disposable inner liner with sensor integration |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB201305758D0 (en) * | 2013-03-28 | 2013-05-15 | Quanta Fluid Solutions Ltd | Blood Pump |
USD857172S1 (en) | 2017-09-08 | 2019-08-20 | Smc Corporation | Control valve |
USD858713S1 (en) | 2017-09-08 | 2019-09-03 | Smc Corporation | Control valve |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06249735A (ja) * | 1993-02-23 | 1994-09-09 | T H I Syst Kk | 流体用センサ |
JP2005010078A (ja) | 2003-06-20 | 2005-01-13 | Surpass Kogyo Kk | インライン型圧力センサ |
JP2008207121A (ja) * | 2007-02-27 | 2008-09-11 | Nissan Motor Co Ltd | 取付部材 |
JP2011185635A (ja) * | 2010-03-05 | 2011-09-22 | Surpass Kogyo Kk | 圧力センサ、差圧式流量計及び流量コントローラ |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4462409A (en) * | 1981-05-15 | 1984-07-31 | Healthdyne, Inc. | Pressure transducer dome |
-
2012
- 2012-02-24 JP JP2012039195A patent/JP5823888B2/ja active Active
-
2013
- 2013-01-31 WO PCT/JP2013/052122 patent/WO2013125317A1/ja active Application Filing
- 2013-01-31 EP EP13751347.9A patent/EP2818841B1/en active Active
- 2013-01-31 KR KR1020147022947A patent/KR101613479B1/ko active IP Right Grant
- 2013-01-31 US US14/380,340 patent/US9778128B2/en active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06249735A (ja) * | 1993-02-23 | 1994-09-09 | T H I Syst Kk | 流体用センサ |
JP2005010078A (ja) | 2003-06-20 | 2005-01-13 | Surpass Kogyo Kk | インライン型圧力センサ |
JP2008207121A (ja) * | 2007-02-27 | 2008-09-11 | Nissan Motor Co Ltd | 取付部材 |
JP2011185635A (ja) * | 2010-03-05 | 2011-09-22 | Surpass Kogyo Kk | 圧力センサ、差圧式流量計及び流量コントローラ |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10267701B2 (en) | 2013-10-30 | 2019-04-23 | Alphinity, Llc | Fluid monitoring device with disposable inner liner with sensor integration |
US10502650B2 (en) | 2013-10-30 | 2019-12-10 | Alphinity, Llc | Fluid monitoring device with disposable inner liner with sensor integration |
US10215597B2 (en) | 2014-01-17 | 2019-02-26 | Alphinity, Llc | Fluid monitoring assembly with sensor functionality |
US10451451B2 (en) | 2014-01-17 | 2019-10-22 | Alphinity, Llc | Fluid monitoring assembly with sensor functionality |
US11015962B2 (en) | 2014-01-17 | 2021-05-25 | Repligen Corporation | Fluid monitoring assembly with replaceable sensor functionality |
US11512987B2 (en) | 2014-01-17 | 2022-11-29 | Repligen Corporation | Fluid monitoring assembly with replaceable sensor functionality |
Also Published As
Publication number | Publication date |
---|---|
JP5823888B2 (ja) | 2015-11-25 |
EP2818841B1 (en) | 2020-04-01 |
EP2818841A4 (en) | 2015-11-04 |
KR20140116937A (ko) | 2014-10-06 |
JP2013174507A (ja) | 2013-09-05 |
US9778128B2 (en) | 2017-10-03 |
US20150013467A1 (en) | 2015-01-15 |
KR101613479B1 (ko) | 2016-04-19 |
EP2818841A1 (en) | 2014-12-31 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2013125317A1 (ja) | 圧力センサ | |
KR100827759B1 (ko) | 유량계 | |
US6640650B2 (en) | Flow rate sensor | |
JP4234024B2 (ja) | インライン型圧力センサー | |
KR101943811B1 (ko) | 유체 계측용 센서의 설치 구조 | |
KR20180114921A (ko) | 오리피스 내장 밸브 및 압력식 유량 제어 장치 | |
JP2013160747A (ja) | 圧力検出器 | |
EP3104134A1 (en) | Gas flowmeter | |
KR102612893B1 (ko) | 압력 검출 장치 | |
JP2005010078A (ja) | インライン型圧力センサ | |
KR102604020B1 (ko) | 압력 검출 장치 | |
JP2013524186A (ja) | ハウジングを備える測定プローブ | |
JP5745325B2 (ja) | 漏液検出装置及び漏液検出装置の基台 | |
KR20150098586A (ko) | 차압식 유량계 및 그것을 구비한 유량 컨트롤러 | |
JP5277911B2 (ja) | 流体計測用流路装置 | |
JP2009133747A (ja) | 流路センサ | |
JP2009168629A (ja) | 電磁流量計 | |
JP6238824B2 (ja) | 液体圧検出装置 | |
JP6672834B2 (ja) | 水位検知装置 | |
JP2014095558A (ja) | 接続パーツおよび差圧/圧力発信器 | |
CA2567284C (en) | Restriction flowmeter | |
JP2007155566A (ja) | 圧力伝送器 | |
JP6646435B2 (ja) | 流体混合装置 | |
GB2443544A (en) | Multi functional fuel mixing tank | |
JP6022203B2 (ja) | ガスメータ |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 13751347 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 20147022947 Country of ref document: KR Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 14380340 Country of ref document: US Ref document number: 2013751347 Country of ref document: EP |
|
NENP | Non-entry into the national phase |
Ref country code: DE |