Pressure measuring device

Abstract

A pressure measuring device is disclosed that measures the pressure of a part to be measured and converts the measurement result into an electrical signal to be output externally. The pressure measuring device according to the present invention comprises: a conduit having a passage (flow path) through which pressure is introduced formed along the center and a receiving groove on the upper side communicating with said passage, and having screw threads formed on the outer surface; an intermediate member disposed at the top of the conduit and having a through hole formed in the center that coincides with the center of the receiving groove; a sensor body installed in a receiving part partitioned by the receiving groove and the through hole; and a detection element mounted on the upper surface of the sensor body and electrically connected to a substrate on the intermediate member, wherein the conduit and the sensor body are directly connected to the intermediate member, and the conduit and the sensor body are indirectly connected to each other through the intermediate member. The present invention, with such a configuration, can resolve or minimize the conventional problem in which a reaction force caused by assembly torque is transmitted to the detection element (sensor element) when assembled to a part to be mounted (sensor mounting part), thereby causing measurement deviation.

Description

Technology Field

[0001] The present invention relates to a pressure measuring device, and more particularly to a pressure measuring device that measures the pressure of a part to be measured and converts the measurement result into an electrical signal to output to the outside. Background Technology

[0002] Pressure measuring devices refer to pressure gauges primarily used to measure fluid pressure, installed in fluid passages or on valves in applications such as automobiles, chemical facilities, and semiconductor manufacturing equipment. For example, in the automotive sector, they are used to measure vehicle manifold pressure, engine hydraulic pressure, hydrogen gas or air pressure in fuel cell vehicles, and exhaust gas pressure within mufflers with high precision.

[0003] Various configurations of such pressure measuring devices are known, including Korean Patent Publication No. 10-2005-0014871 and Korean Patent Publication No. 10-2013-0037066. Basically, they are configured to include a detection element for pressure detection, a terminal that transmits a signal generated from the detection element to the outside, and a housing and a port arranged to surround the detection element.

[0004] FIG. 1 is a schematic cross-sectional view of a pressure measuring device according to the prior art.

[0005] A pressure measuring device according to the prior art includes, as illustrated in FIG. 1, a conduit (100) having a passage (flow path) through which pressure is introduced along the center, an intermediate member (200) coupled to the upper end of the conduit (100), a sensor body (300) installed in an inner mounting space formed by the combination of the conduit (100) and the intermediate member (200), and a detection element (400) mounted on the upper surface of the sensor body (300) and electrically connected to a substrate on the intermediate member (200).

[0006] In such a conventional pressure measuring device, as shown in the enlarged view of the main part of FIG. 1, the conduit (100) and the sensor body (300) are directly connected through laser welding (the part indicated by arrow ①), and the conduit (100) and the intermediate member (200) are directly connected through laser welding (the part indicated by arrow ②). Therefore, when the pressure measuring device is assembled to the mounting target, the reaction force caused by the assembly torque is inevitably transmitted directly to the detection element (400).

[0007] In Figure 1, the streamlined arrow indicates the reaction force transmission route through which the reaction force caused by the assembly torque is transmitted to the detection element when the pressure measuring device is assembled to the mounting target part.

[0008] In this way, when a reaction force caused by assembly torque is transmitted to a detection element, the detection element detects that reaction force, resulting in a measurement deviation. In particular, when no pressure is applied, the output should also be corresponding; however, in a structure like that of Fig. 1, there is a problem where the detection accuracy and precision are reduced because the output fluctuates, such as when the output continues to be produced as if pressure were applied due to the reaction force. Prior art literature

[0009] Republic of Korea Published Patent Application No. 10-2005-0014871 (Publication Date: Feb. 07, 2005) Republic of Korea Published Patent Application No. 10-2013-0037066 (Publication Date: Apr. 15, 2013) The problem to be solved

[0010] The technical problem that the present invention aims to solve is to provide a pressure measuring device capable of resolving or minimizing the problem in which a reaction force caused by assembly torque is transmitted to a detection element (sensor element) during assembly to a mounting target (sensor mounting part), thereby causing measurement deviation. means of solving the problem

[0011] According to one aspect of the present invention as a means of solving the problem,

[0012] A conduit having a passage (flow channel) through which pressure is introduced formed along the center, a receiving groove on the upper side communicating with said passage, and screw threads formed on the outer surface;

[0013] An intermediate member positioned at the top of the above conduit, having a through hole formed in the center that coincides with the center of the above receiving groove;

[0014] A sensor body installed in a receiving portion partitioned by the above-mentioned receiving groove and through hole; and

[0015] It includes a detection element mounted on the upper surface of the sensor body and electrically connected to a substrate on the intermediate member;

[0016] The conduit and the sensor body are directly connected to the intermediate member, and

[0017] The present invention provides a pressure measuring device characterized in that the above conduit and sensor body are indirectly connected to each other through an intermediate member.

[0018] Here, the upper outer edge of the conduit is fixed by welding to the lower portion of the intermediate member outside the through hole, and the binding wing of the sensor body is fixed by welding to the lower edge of the through hole, and the lower region of the sensor body including the binding wing is received in the receiving groove with a predetermined gap (g1, g2, g3, g4) so ​​that the conduit and the sensor body do not come into direct contact.

[0019] And the sensor body applied in the present invention may be composed of an upper region located in the through hole such that a portion of the upper part protrudes higher than the upper surface of the intermediate member, and a lower region below the upper region that is received in the receiving groove with a structure spaced apart with a predetermined gap (g1, g2, g3, g4).

[0020] In addition, a stepped portion may be formed on the upper edge of the binding wing, which is closely attached to the lower corner of the through hole during device assembly and welded to the lower corner of the through hole.

[0021] The pressure measuring device according to the present invention may further include a terminal housing that is coupled to the upper surface of the intermediate member through a binding flange to cover the detection element and the substrate, and has a connecting hole formed on the inside.

[0022] At this time, a terminal is embedded in the terminal housing, and the terminal and the substrate can be electrically connected through an electrically conductive elastic member mounted in the connection hole.

[0023] According to another aspect of the present invention as a means of solving the problem,

[0024] A conduit having a passage for introducing pressure formed along the center, a receiving groove communicating with said passage at the top, and screw threads formed on the outer surface;

[0025] An intermediate member positioned at the top of the above conduit;

[0026] A sensor body formed integrally in the center of the above intermediate member and coupled in a structure in which a portion is received in the receiving groove with a predetermined gap (g1, g2, g3, g4); and

[0027] A pressure measuring device is provided, characterized by including a detection element mounted on the upper surface of the sensor body and electrically connected to a substrate on the intermediate member. Effects of the invention

[0028] According to the pressure measuring device of an embodiment of the present invention, the sensor body and the intermediate member are welded first, and then the conduit and the intermediate member are welded so that the conduit and the sensor body are indirectly connected through the intermediate member, and the sensor body and the conduit do not come into direct contact with each other through gaps (g1, g2, g3, g4), thereby forming a structure such that the reaction force caused by the assembly torque is not transmitted directly from the conduit to the sensor body but passes through the intermediate member.

[0029] That is, when assembling the pressure measuring device to the mounting target, the transmission route of the reaction force caused by strong assembly torque becomes significantly longer compared to the conventional configuration, thereby blocking or minimizing the transmission of the reaction force to the detection element. Consequently, the problem of the conventional technology in which the output of the detection element becomes inaccurate due to the reaction force can be resolved or significantly reduced. Brief explanation of the drawing

[0030] FIG. 1 is a schematic cross-sectional view of a pressure measuring device according to the prior art. FIG. 2 is a separated cross-sectional view of a pressure measuring device according to one embodiment of the present invention. FIG. 3 is a combined cross-sectional view of the pressure measuring device shown in FIG. 2. FIG. 4 is an enlarged view of the essential part of the present invention, showing part 'A' of FIG. 3 in enlarged form. FIG. 5 is a reference diagram for showing the route through which a reaction force is transmitted by a strong assembly torque when a pressure measuring device according to one embodiment of the present invention is assembled to a mounting target part. FIG. 6 is a combined cross-sectional view of a pressure measuring device according to another embodiment of the present invention. FIG. 7 is an enlarged view of the key part showing section 'B' of FIG. 6. Specific details for implementing the invention

[0031] Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

[0032] In describing the present invention, the terms used in the specification below are used merely to describe specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise.

[0033] Furthermore, terms such as “comprising” or “having” in this specification are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0034] In describing the invention with reference to the attached drawings, identical components are assigned the same reference numerals, and redundant descriptions of identical components are omitted. Furthermore, in describing the invention, if it is determined that a detailed description of related prior art could unnecessarily obscure the essence of the invention, such detailed description is omitted.

[0035] FIG. 2 is a separated cross-sectional view of a pressure measuring device according to one embodiment of the present invention, and FIG. 3 is a combined cross-sectional view of the pressure measuring device shown in FIG. 2.

[0036] Referring to FIGS. 2 and 3, a pressure measuring device (1) according to one embodiment of the present invention includes a conduit (10). The conduit (10) may have a passage (12, a flow path into which pressure is introduced) formed along the center, and may have a receiving groove (14) on the upper side that communicates with the passage (12). Additionally, a screw thread (16) for screw fastening with a mounting target (sensor mounting part) may be formed on the outer surface. This conduit (10) may be made of a metal material.

[0037] An intermediate member (20) may be disposed at the top of the conduit (10). The intermediate member (20) may be configured in the shape of a nut, having a polygonal planar shape, preferably a hexagonal one, and having a through hole (24) in its center that coincides with the center of the receiving groove (14) of the conduit (10). This intermediate member (20) may also be made of a metal material and may be manufactured separately from the conduit (10) and joined to the conduit (10) through welding.

[0038] A receiving portion (S) may be formed on the upper side of the conduit (10) and on the inner side of the intermediate member (20) by means of the receiving groove (14) of the conduit (10) and the through hole (24) of the intermediate member (20), and a sensor body (30) may be installed in the receiving portion (S) partitioned by the receiving groove (14) and the through hole (24). Additionally, a detection element (40, sensor element) may be mounted on the upper surface of the sensor body (30), which is installed to protrude a predetermined height above the upper surface of the intermediate member (20) through the through hole (24).

[0039] A substrate (50) having a hole in the center corresponding to a through hole (24) may be installed on the upper surface of the intermediate member (20), and the substrate (50) on the intermediate member (20) and the detection element (40) on the upper surface of the sensor body (30) may be electrically connected through wire bonding or the like. Accordingly, a signal generated by the detection element (40) is transmitted to the substrate (50) and, after a predetermined processing, can be output to the outside in the form of an electrical signal through the elastic member (55) and terminal (70) described later.

[0040] A terminal housing (60) may be attached to the upper surface of the intermediate member (20). The terminal housing (60) may be attached to the upper surface of the intermediate member (20) through a binding flange (80) in a structure that covers and conceals the detection element (40) and the substrate (50), and two or more connecting holes (62) may be formed inside it. Two or more terminals (70) may be embedded in the terminal housing (60), and an electrically conductive elastic member (55) may be installed in each of the connecting holes (62).

[0041] The elastic member (55) may be, for example, a compression coil spring as shown in the drawing, and its upper and lower ends are elastically attached to the input end of the terminal (70) and the output terminal (not shown) of the substrate (50), so that the terminal (70) and the substrate (50) can be electrically connected in a structure that is always in contact. As a result, externally applied power can be supplied to the substrate (50) through the terminal (70), or an electrical signal generated by the detection element (40) can be transmitted from the substrate (50) to the terminal (70).

[0042] FIG. 4 is an enlarged view of the essential part of the present invention, showing part 'A' of FIG. 3 in enlarged form.

[0043] Referring to FIG. 4 and FIG. 3 together, in a pressure measuring device (1) according to one embodiment of the present invention, the conduit (10) and the sensor body (30) are directly connected to an intermediate member (20), and the conduit (10) and the sensor body (30) are indirectly connected to each other through the intermediate member (20), so that when the pressure measuring device is assembled to a mounting target (sensor mounting part), the reaction force caused by the assembly torque is blocked or minimized from being transmitted to the detection element (40).

[0044] Preferably, the upper outer edge of the conduit (10) is fixed by welding to the lower surface of the intermediate member (20) outside the through hole (24), and the binding wing (32) of the sensor body (30) can be fixed by welding to the lower edge of the through hole (24). And, by receiving the lower region (a2) of the sensor body (30) including the binding wing (32) in a structure that is spaced apart from the receiving groove (14) with a predetermined gap (g1, g2, g3, g4), the conduit (10) and the sensor body (30) do not come into direct contact with each other.

[0045] For reference, the part indicated by the arrow in Fig. 4 is where the two components (conduit and intermediate member, and intermediate member and sensor body) are joined through welding.

[0046] The sensor body (30) applied in the present invention may specifically be composed of an upper region (a1) and a lower region (a2) formed below it and including the binding wing (32). The upper region (a1) may be positioned with a gap between its wall (wall of the through hole) and the upper portion of the upper portion of the intermediate member (20) so that it protrudes higher than the upper surface of the intermediate member (20), and the lower region (a2) may be received in a structure spaced apart with a predetermined gap (g1, g2, g3, g4) in the receiving groove (14).

[0047] A stepped portion (33) may be formed on the upper edge of the binding wing (32). This stepped portion (33) may be closely attached to the lower corner of the through hole (24) in a structure that engages during device assembly, and in that state, the outer side of the stepped portion (33) may be attached and fixed to the intermediate member (20) through welding. Through such a stepped portion (33), the present invention can easily implement centering that aligns the center of the sensor body (30) with the center of the through hole (24) during device assembly.

[0048] We will briefly examine the assembly process of a pressure measuring device according to an embodiment of the present invention configured as described above, with reference to the preceding FIGS. 2 and FIGS. 3.

[0049] In the assembly of the pressure measuring device (1) according to one embodiment of the present invention, first, a sensor body (30) is pushed in from the lower part of the through hole (24) so ​​that a portion of it is positioned in the through hole (24) of the intermediate member (20). At this time, when the aforementioned stepped portion (33) comes into contact with the lower corner of the through hole (24) and the sensor body (30) no longer moves upward, the sensor body (30) is pushed into the through hole (24), and then the sensor body (30) and the intermediate member (20) are joined together by welding.

[0050] Next, a conduit (10) is assembled at the bottom of the intermediate member (20) so that the receiving groove (14) surrounds the lower region (a2) of the sensor body (30) combined with the intermediate member (20), and then the intermediate member (20) and the conduit (10) are joined together by welding. Then, a detection element (40) and a substrate (50) are mounted on the upper surface of the sensor body (30) and the upper surface of the intermediate member (20), respectively, and then the detection element (40) and the substrate (50) are electrically connected to each other through wire bonding.

[0051] When the sensor body (30), conduit (10), and substrate (50) are combined with the intermediate member (20), a binding flange (80) is attached to the intermediate member (20). Specifically, the lower end of the binding flange (80) is welded to the upper surface of the intermediate member (20) that contacts it to attach the binding flange (80) to the intermediate member (20), and the assembly can be completed by inserting a terminal (70) with an elastic member (55) installed inside into the upper part of the binding flange (80) so that it is fixed and secured inside the binding flange (80).

[0052] In a pressure measuring device according to one embodiment of the present invention assembled in this manner, the sensor body and the intermediate member are welded first, and then the conduit and the intermediate member are welded so that the conduit and the sensor body are indirectly connected through the intermediate member, and the sensor body and the conduit do not come into direct contact with each other through gaps (g1, g2, g3, g4), thereby forming a structure such that the reaction force caused by the assembly torque is not transmitted directly from the conduit to the sensor body but passes through the intermediate member in between.

[0053] That is, when assembling the pressure measuring device to the mounting target, the transmission route of the reaction force caused by strong assembly torque is extended as shown by the arrow in Fig. 5 compared to the conventional configuration of Fig. 1, thereby blocking or minimizing the transmission of the reaction force to the detection element. As a result, the problem of the conventional technology in which the output of the detection element becomes inaccurate due to the reaction force can be resolved or significantly reduced.

[0054] FIG. 6 is a combined cross-sectional view of a pressure measuring device according to another preferred embodiment of the present invention, and FIG. 7 is an enlarged view of the main part of the present invention showing part 'B' of FIG. 6, and the same components having the same function as the above-described embodiment are described by assigning the same reference numerals.

[0055] The pressure measuring device (1) according to another preferred embodiment of the present invention illustrated in FIGS. 6 and 7 is identical to the configuration of the previously described embodiment, except that the intermediate member (20) and the sensor body (30) are formed as a single object, i.e., integrally. Therefore, redundant descriptions of identical configurations will be omitted below, and only the parts corresponding to the differences will be briefly examined.

[0056] Referring to FIGS. 6 and 7, a pressure measuring device (1) according to another embodiment of the present invention includes a sensor body (30) having a detection element (40) mounted on its upper surface and an intermediate member (20). Here, the sensor body (30) may be formed integrally with the intermediate member (20) at the center of the intermediate member (20). The intermediate member (20) and the sensor body (30) formed integrally in this way may be made of steel, preferably stainless steel.

[0057] In configuring the intermediate member (20) and the sensor body (30) as a single unit, a Metal Injection Molding (MIM) method, which is manufactured by injecting and sintering metal powder, may be used, and a part of the sensor body (30) that protrudes downward from the lower surface of the intermediate member (20) in the drawing, i.e., a protrusion (a3), may be connected in a structure in which it is received with a predetermined gap (g1, g2, g3, g4) in a receiving groove (14) formed on the upper part of the conduit (10).

[0058] In FIG. 7, the part indicated by the arrow indicates the part where the lower portion of the intermediate member (20) and the upper outer corner of the conduit (10) are interconnected through welding, and reference numeral 36 indicates a slit formed along the perimeter of the upper portion of the sensor body (30) so that the upper portion of the sensor body (30) is separated from the intermediate member (20) and the reaction force due to assembly torque is not directly transmitted to the upper portion of the sensor body (30) through the intermediate member (20).

[0059] In this other embodiment as well, the conduit (10) and the sensor body (30) are not directly connected to each other, but are indirectly connected to each other through the intermediate member (20), thereby blocking or minimizing the transmission of a reaction force caused by assembly torque to the detection element (40) when the pressure measuring device is assembled to the mounting target (sensor mounting part).

[0060] The above detailed description of the present invention describes only specific embodiments thereof. However, it should be understood that the present invention is not limited to the specific forms mentioned in the detailed description, but rather should be understood to include all variations, equivalents, and substitutions within the spirit and scope of the invention as defined by the appended claims. Explanation of the symbols

[0061] 1 : Pressure measuring device 10: Conduit 12: Passage 14 : Accommodation Home 16 : Screw thread 20 : Intermediate member 24: Through hole 30 : Sensor body 32 : Binding Wings 33 : Step 40 : Detector element (sensor element) 50 : Substrate 55 : Elastic member 60 : Terminal housing 62: Connection hole 70 : Terminal 80 : Binding flange g1, g2, g3, g4 : gaps a1 : Upper area of ​​sensor body a2 : Lower area of ​​sensor body S : Reception part

Claims

Claim 1 A metal conduit having a passage for introducing pressure formed along the center, a receiving groove communicating with the passage at the top, and screw threads formed on the outer surface; an intermediate member having a polygonal planar shape made of metal positioned at the top of the conduit and having a through hole formed in the center that coincides with the center of the receiving groove; and a sensor body installed in a receiving portion partitioned by the receiving groove and the through hole. A pressure measuring device comprising: a detection element mounted on the upper surface of the sensor body and electrically connected to a substrate on the intermediate member; wherein the conduit and the sensor body are directly connected to the intermediate member, and the conduit and the sensor body are indirectly connected to each other through the intermediate member, wherein the upper outer edge of the conduit is fixed by welding to the lower surface of the intermediate member outside the through hole, and the binding wing of the sensor body is fixed by welding to the lower edge of the through hole, and the lower region of the sensor body including the binding wing is received in the receiving groove with a predetermined gap so that the conduit and the sensor body do not come into direct contact, and a step portion is formed on the upper edge of the binding wing, and further comprising a terminal housing coupled to the upper surface of the intermediate member through a binding flange to cover the detection element and the substrate and having a connecting hole formed on the inside; wherein a terminal is embedded in the terminal housing, and the terminal and the substrate are electrically connected through an electrically conductive elastic member mounted in the connecting hole. Claim 2 delete Claim 3 A pressure measuring device according to claim 1, wherein the sensor body is composed of an upper region located in the through hole such that a portion of the upper part protrudes higher than the upper surface of the intermediate member, and a lower region below the upper region that is received in the receiving groove with a predetermined gap. Claim 4 A pressure measuring device according to claim 1, characterized in that a stepped portion is formed on the upper edge of the binding wing, which is welded to the lower corner of the through hole and closely fitted in a structure that engages with the lower corner of the through hole during device assembly. Claim 5 delete Claim 6 delete Claim 7 delete

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