Pressure sensor

Abstract

This pressure sensor comprises: a measurement unit that measures the pressure of a to-be-measured fluid, on the basis of the pressure difference between a measurement-pressure receiving surface for receiving the pressure of the fluid and an atmospheric-pressure receiving surface for receiving the atmospheric pressure of an atmospheric pressure space, to output a measurement signal; a connector that is detachably attached to a connected body, is electrically connected to the connected body, and transmits the measurement signal to the connected body; a housing that comprises a holding part that holds the connector, an insertion part into which the connected body is inserted, a space formation part that covers at least a portion of the measurement unit and forms the atmospheric pressure space, and a flow path that has one end connected to the atmospheric pressure space; a seal member that surrounds the connected body attached to the connector and seals a portion between the connected body and the insertion part of the housing; and a fixing member that fixes the seal member to the housing by being held by the insertion part of the housing, and forms, between the fixing member and the housing, an atmospheric pressure release path connecting the other end of the flow path with respect to the one end thereof to an external space.

Description

Pressure sensor

[0001] The present invention relates to a pressure sensor.

[0002] Patent Document 1 discloses a power outlet having an annular groove into which a protective cylindrical portion of a plug is inserted from the front. In Patent Document 1, a waterproof cylindrical packing is interposed between the protective cylindrical portion of the plug inserted into the annular groove and the axial center portion. Patent Document 2 discloses a power outlet in which an elastic member such as rubber is fixed to the inner peripheral surface of a wall portion formed on the upper surface of a housing. In Patent Document 2, when a plug is inserted into the power outlet, this elastic member contacts the outer peripheral surface of the housing of the plug so that no gap is formed between the wall portion and the housing of the plug.

[0003] Japanese Patent Application Laid-Open No. 10-144386, Japanese Utility Model Publication No. 53-138194

[0004] In a pressure sensor having a connector detachably attached to a connected body, it is conceivable to provide a seal structure similar to those of Patent Documents 1 and 2 by a seal member. On the other hand, the pressure sensor measures the pressure of a fluid to be measured by receiving the pressure of the fluid on a measurement pressure receiving surface and receiving the atmospheric pressure on an atmospheric pressure receiving surface. Therefore, a path for air from an internal space where the atmospheric pressure receiving surface is provided and protected by the seal structure to the external space of the atmospheric pressure is required. If the path for air has a simple shape such as a straight line, it is easy for foreign matter or moisture to enter from the external space, so it is desirable that the path for air has a somewhat complicated shape.

[0005] However, there is a limit to the complication of the air path formed in the housing, and it is difficult to sufficiently prevent the intrusion of moisture and the like. Therefore, an object of the present disclosure is to realize a new configuration of an air path that can prevent the intrusion of moisture and the like.

[0006] One embodiment of the pressure sensor according to this disclosure includes: a measuring unit that measures the pressure of a fluid to be measured by the pressure difference between a pressure receiving surface that receives the pressure of the fluid to be measured and an atmospheric pressure receiving surface that receives the atmospheric pressure of an atmospheric pressure space and outputs a measurement signal; a connector that is detachably attached to a connected object and electrically connected to the connected object and transmits the measurement signal to the connected object; a housing that has a holding part for holding the connector, an insertion part into which the connected object is inserted, a space forming part that covers at least a part of the measuring unit and forms the atmospheric pressure space, and a flow path with one end connected to the atmospheric pressure space; a sealing member that surrounds the connected object attached to the connector and seals the space between the connected object and the insertion part of the housing; and a fixing member that is held in the insertion part of the housing and fixes the sealing member to the housing, and forms an atmospheric pressure release passage between the housing and the housing that connects the other end of the flow path to the external space.

[0007] The pressure sensor of this disclosure makes it possible to realize a new atmospheric path configuration that can prevent the intrusion of moisture and other substances.

[0008] Figure 1 is an external perspective view of the pressure sensor. Figure 2 is a perspective cross-sectional view of the pressure sensor. Figure 3 is a partial cross-sectional view of the pressure sensor. Figure 4 is a perspective cross-sectional view showing the measuring section. Figure 5 is an enlarged cross-sectional view showing a part of the measuring section. Figure 6 is a diagram showing the atmospheric passage connecting the atmospheric pressure space and the external space. Figure 7 is a perspective view showing one side of the retainer. Figure 8 is a perspective view showing the other side of the retainer. Figure 9 is a perspective view showing the insertion section of the cover. Figure 10 is a diagram showing the first stage in which the retainer is inserted into the insertion section. Figure 11 is a diagram showing the second stage in which the retainer is inserted into the insertion section. Figure 12 is a diagram showing the mechanism for preventing blockage of the atmospheric pressure opening passage by the claws. Figure 13 is a diagram showing a modified example of the cover.

[0009] Embodiments of the pressure sensor of this disclosure will be described in detail below with reference to the attached drawings. However, in order to avoid unnecessary redundancy in the following description and to facilitate understanding by those skilled in the art, more detailed descriptions than necessary may be omitted. For example, detailed descriptions of already well-known matters and redundant descriptions of substantially identical configurations may be omitted. Also, elements described in the previously described drawings may be referenced as appropriate in the later descriptions of the drawings. In this specification, expressions such as up, down, left, right, front, and back may be used to facilitate understanding of the descriptions, but these expressions indicate positional relationships and directions in the drawings and do not limit the configuration of the present invention.

[0010] <Structure of Pressure Sensor> Figure 1 is an external perspective view of the pressure sensor 10, Figure 2 is a perspective cross-sectional view of the pressure sensor 10, and Figure 3 is a partial cross-sectional view of the pressure sensor 10. The pressure sensor 10 is a sensor that measures the pressure of a fluid, whether liquid or gas. In this specification, the fluid whose pressure is measured by the pressure sensor 10 is referred to as the measuring fluid. The pressure sensor 10 is used, for example, to measure hydraulic pressure in a hydraulic system, to measure air pressure in a compressor, to measure water pressure, etc.

[0011] The pressure sensor 10 comprises a cover 100, a retainer 200, a fluid introduction section 300, a measuring section 400, a connector 500, and a sealing member 600. In this specification, "to be provided" means to be provided in some form, whether as an independent object or as part of an object, unless the context clearly indicates otherwise. In contrast, in this specification, "to have" generally means to have as part of an object.

[0012] The pressure sensor 10 is connected to an external device (only the connector 20 of the external device is shown) via a connector 500 and outputs an electrical measurement signal indicating the measured pressure to the external device. The connector 500 is detachably connected to the connector 20 of the external device. In this example, the connector 500 of the pressure sensor 10 is female and the connector 20 of the external device is male, but the reverse may also apply. In this specification, the connector 20 of the external device is referred to as the connected body 20 to distinguish it from the connector 500 of the pressure sensor 10.

[0013] The cover 100 corresponds to an example of a housing as referred to in this disclosure and includes an insertion portion 101, a holding portion 102, a space forming portion 103, and a flow channel pipe 105. A retainer 200 is held in the insertion portion 101 of the cover 100. The retainer 200 corresponds to an example of a fixing member as referred to in this disclosure and fixes a sealing member 600 inside the insertion portion 101. The connected body 20 is inserted into the insertion portion 101 of the cover 100, and the sealing member 600 surrounds, for example, the lower part of the connected body 20 attached to the connector 500, sealing the space between the connected body 20 and the insertion portion 101 of the cover 100.

[0014] The cover 100 holds the connector 500 in the holding portion 102 and the measuring portion 400 in the space forming portion 103. The fluid introduction portion 300 is fixed to the space forming portion 103 of the cover 100. The space forming portion 103 of the cover 100 forms an atmospheric pressure space 700 inside, where atmospheric pressure is maintained. In other words, the space forming portion 103 covers at least a part of the measuring portion 400 to form the atmospheric pressure space 700. The sealing member 600 prevents foreign matter or moisture from entering the atmospheric pressure space 700 and the measuring portion 400.

[0015] The cover 100 is equipped with a flow path 104 extending inside the flow path pipe 105, and one end (the lower end in Figure 2) 141 of the flow path 104 is connected to the atmospheric pressure space 700 (Figure 6). The fluid introduction section 300 is equipped with an inlet passage 301 inside, and the fluid to be measured flows through the inlet passage 301 to the measurement section 400. The measurement section 400 measures the pressure of the fluid to be measured and outputs a measurement signal. The measurement signal is transmitted to the connector 500, and the connector 500 transmits the measurement signal to the connected body 20. In other words, the connector 500 is detachably attached to the connected body 20 and electrically connected to the connected body 20, and transmits the measurement signal to the connected body 20.

[0016] <Structure of the Measurement Unit> Figure 4 is a perspective cross-sectional view showing the measurement unit 400, and Figure 5 is an enlarged cross-sectional view showing a part of the measurement unit 400. The measurement unit 400 comprises a sensor unit 401, a diaphragm 402, and an amplifier board 403, and the space between the sensor unit 401 and the diaphragm 402 is filled with silicone oil 404.

[0017] The diaphragm 402 has a structure that can be easily deformed in response to the vertical pressure shown in Figure 5. The lower surface 421 of the diaphragm 402 is a pressure receiving surface that receives the pressure of the measuring fluid 30 that has come through the inflow passage 301. The pressure of the measuring fluid 30 received by the lower surface 421 of the diaphragm 402 is transmitted to the sensor unit 401 via the silicone oil 404 due to the deformation of the diaphragm 402.

[0018] The sensor unit 401 has a membrane-like central portion 411. A strain gauge, not shown in the figure, is mounted on the central portion 411. One surface (upper surface) of the central portion 411 is in contact with the atmospheric pressure space 700 and is an atmospheric pressure receiving surface that receives atmospheric pressure. The other surface (lower surface) of the central portion 411 is in contact with the silicone oil 404 and is a surface that receives pressure. The other surface of the central portion 411 receives the pressure of the measurement fluid 30 indirectly via the silicone oil 404 and is therefore a measurement pressure receiving surface, similar to the lower surface 421 of the diaphragm 402.

[0019] The central portion 411 of the sensor unit 401 is strained by the difference between the atmospheric pressure of the atmospheric pressure space 700 and the pressure of the fluid to be measured 30. The strain of the central portion 411 is measured by a strain gauge, and a measurement signal indicating the pressure of the fluid to be measured 30 is output. The measurement signal is amplified by the circuit of the amplifier board 403 and output to the connector 500. In this embodiment, the atmospheric pressure of the atmospheric pressure space 700 is used as a reference for measuring the pressure of the fluid to be measured 30.

[0020] In other words, the measuring unit 400 measures the pressure of the fluid 30 to be measured by the pressure difference between the pressure receiving surface that receives the pressure of the fluid 30 to be measured and the atmospheric pressure receiving surface that receives the atmospheric pressure of the atmospheric pressure space 700, and outputs a measurement signal. Since the atmospheric pressure of the atmospheric pressure space 700 is used as a reference for measuring the pressure of the fluid 30 to be measured, the atmospheric pressure space 700 needs to be connected to the external space 85 of the pressure sensor 10 and maintained at atmospheric pressure. On the other hand, since the atmospheric pressure space 700 is prevented from entering by the sealing member 600, it is also necessary that the atmospheric pressure space 700 and the external space 85 are connected by an air passage 87 (Figure 6) with a structure that prevents the entry of moisture and other substances.

[0021] <Structure of the Atmospheric Path> Figure 6 shows the atmospheric path 87 connecting the atmospheric pressure space 700 and the external space 85. As described above, the cover 100 is equipped with a flow path 104 extending inside the flow path pipe 105, and one end (lower end) 141 of the flow path 104 is connected to the atmospheric pressure space 700. The other end (upper end) 142 of the flow path 104 reaches the part of the insertion portion 101 of the cover 100 that faces the retainer 200. A small gap is provided between the insertion portion 101 of the cover 100 and the retainer 200, and this gap forms the atmospheric pressure opening passage 800 that connects the flow path 104 and the external space 85. In this embodiment, the atmospheric path 87 is formed by the flow path 104 and the atmospheric pressure opening passage 800.

[0022] In other words, the retainer 200 is held in the insertion portion 101 of the cover 100, thereby fixing the sealing member 600 to the cover 100, and forming an atmospheric pressure opening passage 800 between the cover 100 and the retainer 200, connecting the other end 142 of the flow path 104 to the external space 85. The atmospheric pressure space 700 is connected to the external space 85 by the atmospheric passage 87 which connects the flow path 104 and the atmospheric pressure opening passage 800, and therefore the atmospheric pressure space 700 is maintained at atmospheric pressure. Furthermore, the shape of the atmospheric passage 87 which connects the flow path 104 and the atmospheric pressure opening passage 800 is complex, having multiple bends and narrow sections, so that moisture and other substances do not enter the atmospheric pressure space 700 from the external space 85.

[0023] The insertion portion 101 and the retainer 200 are structurally designed to easily and reliably form the atmospheric pressure release passage 800. The details of the structure of the retainer 200 and the insertion portion 101 will be described below.

[0024] Figures 7 and 8 are perspective views showing the retainer 200, and Figure 9 is a perspective view showing the insertion portion 101 of the cover 100. Figure 7 shows one side (front side) of the retainer 200, and Figure 8 shows the other side (rear side) of the retainer 200. The retainer 200 comprises a wall portion 201, a claw 202, a spring portion 203, and a flange portion 204. When viewed from above, the shape of the retainer 200 is approximately rectangular. Three sides of this rectangle are defined by the wall portion 201, and the remaining side is defined by the spring portion 203. As shown in Figure 7, the wall portion 201 and the spring portion 203 form a cylindrical shape. The claw 202 protrudes outward (forward) from the cylindrical shape (spring portion 203), and the claw 202 can be displaced in the inward / outward direction (front-back direction) of the cylindrical shape by the elastic bending of the spring portion 203. The wall portion 201 forms the left side (left wall) 201a, the right side (right wall) 201b, and the back (rear wall) 201c of the retainer 200. In this embodiment, the retainer 200 is equipped with two claws 202.

[0025] The flange portion 204 extends outward from the cylindrical shape (upper edge of the wall portion 201) of the retainer 200. As shown in Figure 8, the back surface (rear wall) 201c of the retainer 200 is provided with an opening surface 205 that forms the atmospheric pressure opening passage 800. As shown in Figure 9, the insertion portion 101 of the cover 100 is cylindrical in shape overall and has a left side surface 101a, a right side surface 101b, a back surface 10c, and a front surface 115. The upper edge of the cylindrical shape of the insertion portion 101 is a rectangular end surface 112. Of the inner circumferential surface of the insertion portion 101 of the cover 100, the surface surrounding the other end 142 of the flow path 104 (back surface 101c of the insertion portion 101) is provided with an opening surface 111 that forms the atmospheric pressure opening passage 800.

[0026] In other words, the retainer 200 has a cylindrical shape that surrounds the connected body 20, and the insertion portion 101 of the cover 100 has a cylindrical shape that surrounds the retainer 200. The atmospheric pressure release passage 800 is formed between the release passage forming surface 205 on the back surface 201c of the retainer 200 and the release passage forming surface 111 on the back surface 101c of the insertion portion 101.

[0027] As shown in Figure 9, the insertion portion 101 has a first hole 113 and a second hole 114. In this embodiment, the insertion portion 101 has two first holes 113. The claws 202 of the retainer 200 engage with each of the two first holes 113, fixing the retainer 200 to the insertion portion 101. A part of the connected body 20 engages with the second hole 114, fixing the connected body 20 to the insertion portion 101. By providing separate first holes 113 for fixing the retainer 200 and second holes 114 for fixing the connected body 20, the fixing of the retainer 200 and the connected body 20 is stabilized. The first holes 113 and the second holes 114 are provided on the front portion 115 of the insertion portion 101 (opposite the back portion 201c on which the open passage forming surface 111 is provided). The front portion 115, which has the first hole 113 and the second hole 114, constitutes the cylindrical front surface (front wall) of the insertion portion 101, while slightly protruding outwards from the cylindrical shape and upwards in Figure 9. The upper edge 116 of the front portion 115 protrudes upwards in Figure 9 than the end surface 112 on the open passage forming surface 111 side.

[0028] When the retainer 200 shown in Figures 7 and 8 is inserted into and fixed in the insertion portion 101 shown in Figure 9, an atmospheric pressure opening passage 800 is formed between the opening passage forming surface 111 of the insertion portion 101 and the opening passage forming surface 205 of the retainer 200. Since the atmospheric pressure opening passage 800 is a small gap between the two opening passage forming surfaces 111 and 205, the intrusion of moisture and other substances is suppressed.

[0029] Figures 10 and 11 show how the retainer 200 is inserted into the insertion portion 101. When the retainer 200 is inserted into the insertion portion 101 from above as shown in Figure 10, the claws 202 of the retainer 200 come into contact with the upper edge 116 of the insertion portion 101 (Figure 10). As the retainer 200 is pushed further into the insertion portion 101 from the state shown in Figure 10, the claws 202 are pushed against the edge 116 of the insertion portion 101, as shown in Figure 11, and the spring portion 203 bends elastically, causing the claws 202 to retract into the inside of the retainer 200 (left side in Figure 11). As the retainer 200 is pushed further in, the claws 202 reach the position of the first hole 113, and as shown by the dotted line in Figure 11, the force of the spring portion 203 pushes the claws 202 back (moving to the right in Figure 11) and engages with the hole 113 (snap fit). As a result, the retainer 200 is fixed to the insertion portion 101. In other words, the retainer 200 has claws 202 that protrude outward (forward) from the front portion of the retainer 200 and engage with the insertion portion 101 of the cover 100.

[0030] As described above, the claws 202 of the retainer 200 snap-fit ​​onto the insertion portion 101 of the cover 100, making it easy to install the retainer 200 and easily form the atmospheric pressure release passage 800. Once the retainer 200 is inserted into the insertion portion 101 and fixed to the insertion portion 101 by the claws 202, the upper end surface 112 of the insertion portion 101 and the flange portion 204 of the retainer 200 face each other, as shown in Figure 6. The atmospheric pressure release passage 800 is then connected between the flange portion 204 and the end surface 112.

[0031] In other words, the retainer 200 has a flange portion 204 that extends outward from the upper end of the retainer 200 and faces the upper end surface 112 of the insertion portion 101, and the atmospheric pressure release passage 800 extends between the flange portion 204 and the end surface 112. As a result, the atmospheric pressure release passage 800 has a shape in which the vertical portion in Figure 6 and the horizontal portion in Figure 6 are connected, making it easier to prevent moisture and other substances from entering the flow path 104 and the atmospheric pressure space 700 from the external space 85.

[0032] Furthermore, the retentioner 200 is fixed to the insertion portion 101 by the claws 202, which suppresses the occlusion of the atmospheric pressure release passage 800, as will be explained below. Figure 12 is a diagram illustrating the mechanism by which the claws 202 suppress the occlusion of the atmospheric pressure release passage 800. The retentioner 200 is pushed into the insertion portion 101 from above in Figure 12, thereby pressing the sealing member 600 downwards in Figure 12 and fixing the sealing member 600 to the insertion portion 101. As a result, as indicated by the upward arrow A in Figure 12, the retentioner 200 receives an upward reaction force from the sealing member 600. On the other hand, since the retentioner 200 is engaged with the first hole 113 of the insertion portion 101 by the claws 202, a force acts to resist the reaction force (arrow A) from the sealing member 600 and hold the retentioner 200 in place, as indicated by the downward arrow B in Figure 12.

[0033] The claws 202 of the retainer 200 are provided on the side opposite to the opening-forming surface 205 that forms the atmospheric pressure opening passage 800. In other words, the atmospheric pressure opening passage 800 is formed on the side opposite to the side from which the claws 202 protrude. The force indicated by the downward arrow B described above acts on the claws 202. Therefore, when looking at the retainer 200 as a whole, a rotational force is generated in the retainer 200 that moves the opening-forming surface 205 of the retainer 200 away from the opening-forming surface 111 of the insertion portion 101, as shown by the clockwise arrow C in Figure 12. This rotational force (arrow C) suppresses the blocking of the atmospheric pressure opening passage 800. In other words, in the pressure sensor 10 of this embodiment, a force that suppresses the blocking of the atmospheric pressure opening passage 800 acts on the retainer 200.

[0034] Figure 13 shows a modified version of the cover 100. In the modified cover 100, a spacer 117 is provided between the opening passage forming surface 111 of the insertion portion 101 and the opening passage forming surface 205 of the retainer 200. The spacer 117 is located within the atmospheric pressure opening passage 800 and maintains the distance between the insertion portion 101 and the retainer 200. In other words, the spacer 117 may be provided as part of the opening passage forming surface 111 of the insertion portion 101 (for example, protruding a predetermined distance from the opening passage forming surface 111 toward the front of the cover 100), or as part of the opening passage forming surface 205 of the retainer 200 (for example, protruding a predetermined distance from the opening passage forming surface 205 toward the back of the retainer 200). Alternatively, the spacer 115 may be a component independent of the cover 100 and the retainer 200. Furthermore, the shape of the spacer 117 is not limited to the shape shown. Since the spacer 117 maintains the distance between the insertion portion 101 and the retainer 200, when the spacer 117 is provided, the blockage of the atmospheric pressure opening passage 800 is suppressed compared to when it is not provided.

[0035] Furthermore, this technology can take the following configuration: (1) A pressure sensor comprising: a measuring unit that measures the pressure of a fluid to be measured by the pressure difference between a pressure receiving surface that receives the pressure of the fluid to be measured and an atmospheric pressure receiving surface that receives the atmospheric pressure of an atmospheric pressure space and outputs a measurement signal; a connector that is detachably attached to a connected object and electrically connected to the connected object and transmits the measurement signal to the connected object; a housing that has a holding part for holding the connector, an insertion part into which the connected object is inserted, a space forming part that covers at least a part of the measuring unit and forms the atmospheric pressure space, and a flow path with one end connected to the atmospheric pressure space; a sealing member that surrounds the connected object attached to the connector and seals the space between the connected object and the insertion part of the housing; and a fixing member that is held in the insertion part of the housing, thereby fixing the sealing member to the housing, and forming an atmospheric pressure release path between the housing and the housing that connects the other end of the flow path to the external space.

[0036] (2) The pressure sensor according to (1), wherein the other end of the flow path reaches the portion of the insertion part facing the fixing member.

[0037] (3) The pressure sensor according to (1) or (2), further comprising a spacer located within the atmospheric pressure opening passage to maintain the distance between the insertion portion and the fixing member.

[0038] (4) The pressure sensor according to any one of (1) to (3), wherein the fixing member has a cylindrical portion surrounding the connected body, the insertion portion of the housing has a cylindrical portion surrounding the fixing member, and the atmospheric pressure release passage is formed between the outer circumferential surface of the cylindrical portion of the fixing member and the inner circumferential surface of the cylindrical portion of the insertion portion.

[0039] (5) The pressure sensor according to (4), wherein the fixing member has claws that protrude outward from the outer circumference of the cylindrical portion and engage with the insertion portion of the housing.

[0040] (6) The claw snap-fits onto the insertion portion of the housing, the pressure sensor as described in (5).

[0041] (7) The pressure sensor according to (5) or (6), wherein the atmospheric pressure release passage is formed on the side opposite to the side from which the claw protrudes.

[0042] (8) The pressure sensor according to any one of (5) to (7), wherein the cylindrical portion of the insertion part comprises a first hole into which the claws engage and a second hole into which a part of the connected body engages and is fixed.

[0043] (9) The fixing member has a flange portion that extends outward from the outer circumference of the cylindrical portion of the fixing member and faces the end face of the cylindrical portion of the insertion portion, and the atmospheric pressure release passage extends between the flange portion and the end face, the pressure sensor according to any one of (4) to (8).

[0044] 10: Pressure sensor 20: Connector on the external device side (connected body) 30: Measuring fluid 85: External space 87: Air passage 100: Cover 101: Insertion part 102: Holding part 103: Space forming part 104: Flow path 105: Flow path tube 111: Open passage forming surface 112: End face 113: First hole 114: Second hole 117: Spacer 141: One end 142: Other end 200: Retainer 201: Wall part 202: Claw 203: Spring part 204: Flange part 205: Open passage forming surface 300: Fluid introduction part 400: Measuring part 401: Sensor part 402: Diaphragm 403: Amplifier board 404: Silicone oil 500: Connector 600: Seal material 700: Atmospheric pressure space 800: Atmospheric pressure open path

Claims

1. A pressure sensor comprising: a measuring unit that measures the pressure of a fluid to be measured by the pressure difference between a pressure receiving surface that receives the pressure of the fluid to be measured and an atmospheric pressure receiving surface that receives the atmospheric pressure of an atmospheric pressure space, and outputs a measurement signal; a connector that is detachably attached to a connected object and electrically connected to the connected object, and transmits the measurement signal to the connected object; a housing that has a holding part for holding the connector, an insertion part into which the connected object is inserted, a space forming part that covers at least a part of the measuring unit and forms the atmospheric pressure space, and a flow path with one end connected to the atmospheric pressure space; a sealing member that surrounds the connected object attached to the connector and seals the space between the connected object and the insertion part of the housing; and a fixing member that is held in the insertion part of the housing, thereby fixing the sealing member to the housing, and forming an atmospheric pressure release passage between the housing and the housing that connects the other end of the flow path to the external space.

2. The pressure sensor according to claim 1, wherein the other end of the flow path reaches the portion of the insertion part facing the fixing member.

3. The pressure sensor according to claim 1, further comprising a spacer located within the atmospheric pressure opening passage and maintaining the distance between the insertion portion and the fixing member.

4. The pressure sensor according to claim 1, wherein the fixing member has a cylindrical portion surrounding the connected body, the insertion portion of the housing has a cylindrical portion surrounding the fixing member, and the atmospheric pressure release passage is formed between the outer circumferential surface of the cylindrical portion of the fixing member and the inner circumferential surface of the cylindrical portion of the insertion portion.

5. The pressure sensor according to claim 4, wherein the fixing member is provided with a claw that protrudes outward from the outer circumference of the cylindrical portion and engages with the insertion portion of the housing.

6. The pressure sensor according to claim 5, wherein the claw snaps into the insertion portion of the housing.

7. The pressure sensor according to claim 5, wherein the atmospheric pressure release passage is formed on the side opposite to the side from which the claw protrudes.

8. The pressure sensor according to claim 5, wherein the cylindrical portion of the insertion part comprises a first hole into which the claws engage and a second hole into which a part of the connected body engages and is fixed.

9. The pressure sensor according to claim 4, wherein the fixing member has a flange portion that extends outward from the outer circumference of the cylindrical portion of the fixing member and faces the end face of the cylindrical portion of the insertion portion, and the atmospheric pressure release passage extends between the flange portion and the end face.

Images