JPWO2012014830A1 - Pressure detection device - Google Patents

Abstract

Provided is a pressure detection device capable of reducing the number of parts compared to the prior art. The pressure detection device (100) includes a pressure sensor module (110) for detecting the pressure of compressed air, a sensor base (120) in which the pressure sensor module (110) is installed, and a pressure installed in the sensor base (120). A sensor cover (130) covering the sensor module (110), a flat washer (140) and a screw (150) for pressing and fixing the sensor cover (130) to the sensor base (120) are provided, and the pressure sensor module ( 110), when the sensor cover (130) is pressed against the sensor base (120) by the flat washer (140) and the screw (150), the O-ring (123) of the sensor base (120) and the sensor cover (130) It is characterized by being sandwiched between and fixed to the protrusion (131b).

Description

  The present invention relates to a pressure detection device that detects the pressure of a gas.

  Conventionally, a pressure sensor element, a stem member on which the pressure sensor element is installed via a spacer, a case covering the pressure sensor element installed on the stem member, a spacer interposed between the stem member and the pressure sensor element, 2. Description of the Related Art A pressure detection device is known that includes a presser plate that sandwiches a pressure sensor element together with a spacer, and a mounting screw that fixes the presser plate, the pressure sensor element, and the spacer against the stem member by pressing the presser plate against the stem member side. (For example, refer to Patent Document 1).

Japanese Patent Laid-Open No. 5-52688

  However, in the conventional pressure detecting device, there are problems that parts such as a pressing plate and a spacer are required to fix the pressure sensor element to the stem member, and the number of parts is large.

  Accordingly, an object of the present invention is to provide a pressure detection device that can reduce the number of parts compared to the conventional art.

  The pressure detection device of the present invention includes a pressure sensor module that detects a gas pressure, a sensor base on which the pressure sensor module is installed, a sensor cover that covers the pressure sensor module installed on the sensor base, and the sensor Fixing means for pressing and fixing the cover to the sensor base, the sensor base includes a base side contact portion that contacts the pressure sensor module, and the sensor cover contacts the pressure sensor module. The pressure sensor module is sandwiched and fixed between the base side contact portion and the cover side contact portion when the sensor cover is pressed against the sensor base by the fixing means. It is characterized by that.

  With this configuration, the pressure detection device according to the present invention also fixes the pressure sensor module to the sensor base by the fixing means for fixing the sensor cover to the sensor base, so that the number of parts can be reduced as compared with the related art.

  Further, the fixing means of the pressure detecting device according to the present invention is configured such that the sensor cover is pressed against the external member by pressing the sensor cover against an external member disposed on the side opposite to the sensor cover with respect to the sensor base. The pressure detection device may be pressed and fixed.

  With this configuration, the pressure detection device of the present invention also fixes the pressure detection device to an external member by the fixing means for fixing the sensor cover to the sensor base, so what is the fixing means for fixing the sensor cover to the sensor base? Compared with the structure which fixes the pressure detection apparatus to an external member by another means, parts can be reduced.

  Further, the sensor cover of the pressure detection device of the present invention may include a claw portion that is hooked on the sensor base and temporarily fixes the sensor cover to the sensor base.

  With this configuration, the pressure detection device of the present invention can be unitized before being fixed to the external member by temporarily fixing the sensor cover to the sensor base by the claw portion, so that the external member The fixing work to the can be facilitated.

  The pressure sensor module of the pressure detection device of the present invention has a pressure introduction hole through which the pressure is introduced, and the base side contact portion surrounds the pressure introduction hole and prevents leakage of the gas by elasticity. A sealing member, and the cover-side contact portion includes a protruding portion that protrudes toward the sealing member. The sealing member is configured such that the fixing means attaches the sensor cover to the sensor with respect to the protruding portion. You may arrange | position in the direction pressed against a base.

  With this configuration, in the pressure detection device of the present invention, the sealing member of the sensor base is disposed with respect to the protrusion of the sensor cover in the direction in which the fixing means presses the sensor cover against the sensor base. The pressure sensor module can be pressed firmly against the sealing member of the sensor base.

  The pressure sensor module of the pressure detection device according to the present invention has a pressure introduction hole into which the pressure is introduced, and the base side contact portion surrounds the pressure introduction hole and prevents the gas from leaking. The sensor base includes a movement restricting portion for restricting movement of the pressure sensor module in a direction orthogonal to a direction in which the fixing means presses the sensor cover against the sensor base. The restricting portion may restrict the movement within a range in which the state in which the sealing member surrounds the pressure introducing hole is maintained.

  With this configuration, in the pressure detection device of the present invention, the state in which the sensor base sealing member surrounds the pressure introduction hole of the pressure sensor module is maintained by the movement restriction portion of the sensor base. Compared with a configuration in which the pressure sensor module can be moved until it is not surrounded by the base sealing member, handling can be facilitated.

  Further, the sensor cover of the pressure detection device of the present invention includes an electrode pin for outputting a signal output from the pressure sensor module to the outside of the pressure detection device, and the pressure detection device A lead wire for connecting the wiring of the sensor module and the electrode pin may be provided, and the cover side contact portion may include a protrusion protruding toward the base side contact portion.

  With this configuration, in the pressure detection device of the present invention, the sensor cover is configured to press the pressure sensor module against the sensor base by the protrusion, so that a space in which the lead wire can be disposed is between the pressure sensor module and the sensor cover. Therefore, it is possible to suppress the occurrence of a problem that the lead wire is sandwiched between the pressure sensor module and the sensor cover.

  The air dryer with a pressure detection device according to the present invention is formed with an air dryer that dries the gas by allowing the compressed gas to pass therethrough, and a gas passage that allows the gas that has exited the air dryer to pass therethrough, and is fixed to the air dryer. And a pressure detection device that is fixed to the passage formation portion and detects the pressure of the gas in the gas passage, and the pressure detection device includes a pressure sensor module that detects the pressure, A sensor base on which the pressure sensor module is installed; a sensor cover that covers the pressure sensor module installed on the sensor base; and a fixing means that presses and fixes the sensor cover to the sensor base. The passage forming portion is disposed on the side opposite to the sensor cover side with respect to the sensor base. The fixing means presses the sensor cover against the passage forming portion side to fix the pressure detection device against the passage forming portion, and the sensor base contacts the pressure sensor module. The sensor cover includes a cover side contact portion that contacts the pressure sensor module, and the pressure sensor module is configured such that the sensor cover is pressed against the sensor base by the fixing means. It is sandwiched and fixed between the base side contact portion and the cover side contact portion.

  With this configuration, the air dryer with a pressure detection device of the present invention can also fix the pressure sensor module to the sensor base by the fixing means for fixing the sensor cover to the sensor base. Moreover, the air dryer with a pressure detection device of the present invention can also fix the pressure detection device to the passage forming portion by a fixing means for fixing the sensor cover to the sensor base. Therefore, the air dryer with a pressure detection device of the present invention can reduce the number of parts compared to the conventional one.

  The pressure detection device of the present invention can reduce the number of parts compared to the conventional one.

1 is an external view of an air dryer with a pressure detection device according to a first embodiment of the present invention. It is an external view of the multi-circuit protection valve and pressure detection apparatus of an air dryer with a pressure detection apparatus shown in FIG. It is a circuit diagram of the air dryer with a pressure detection apparatus shown in FIG. It is a top view of the pressure detection apparatus shown in FIG. It is sectional drawing of the pressure detection apparatus in the state currently fixed to the multi-circuit protection valve shown in FIG. It is a disassembled perspective view of the pressure detection apparatus shown in FIG. It is sectional drawing of the pressure sensor module shown in FIG. It is a bottom view of the sensor cover shown in FIG. It is sectional drawing of the pressure detection apparatus which concerns on the 2nd Embodiment of this invention in the state currently fixed to the multi-circuit protection valve. It is sectional drawing of the pressure detection apparatus which concerns on the 3rd Embodiment of this invention in the state currently fixed to the multi-circuit protection valve. It is an external view of the air dryer with a pressure detection apparatus which concerns on the 4th Embodiment of this invention. It is a front view of the pressure detection apparatus shown in FIG. It is a rear view of the pressure detection apparatus shown in FIG. It is a left view of the pressure detection apparatus shown in FIG. It is a right view of the pressure detection apparatus shown in FIG. It is a top view of the pressure detection apparatus shown in FIG. It is a bottom view of the pressure detection apparatus shown in FIG. It is the perspective view seen from the upper surface side of the pressure detection apparatus shown in FIG. It is the perspective view seen from the bottom face side of the pressure detection apparatus shown in FIG. It is the II sectional view taken on the line of FIG. It is II-II line combination sectional drawing of FIG. It is sectional drawing of the pressure detection apparatus in the state currently fixed to the multi-circuit protection valve shown in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
First, the structure of the air dryer with a pressure detection device according to the present embodiment will be described.

  FIG. 1 is an external view of an air dryer 10 with a pressure detection device according to the present embodiment. FIG. 2 is an external view of the multi-circuit protection valve 30 and the pressure detection device 100 of the air dryer 10 with a pressure detection device. FIG. 3 is a circuit diagram of the air dryer 10 with a pressure detection device.

  The air dryer 10 with a pressure detection device shown in FIGS. 1 to 3 is equipped with devices such as brakes and suspensions (hereinafter referred to as “pneumatic actuators”) that are operated by the pressure of compressed air, which is a compressed gas. It is mounted on a vehicle and prevents malfunction of a pneumatic actuator by removing moisture in the compressed air and drying the compressed air. As a vehicle equipped with a pneumatic actuator, for example, there are commercial vehicles such as large and medium trucks and buses.

  The air dryer 10 with a pressure detection device is formed with an air dryer 20 that dries compressed air by allowing the compressed air to pass inside, and a flow path 31 as a gas passage according to the present invention that allows the compressed air emitted from the air dryer 20 to pass therethrough. A multi-circuit protection valve 30 as a passage forming portion of the present invention fixed to the air dryer 20, and a pressure detection device 100 fixed to the multi-circuit protection valve 30 and detecting the pressure of the compressed air in the flow path 31 are provided. Yes.

  The air dryer 20 communicates the gas inlet 21 into which compressed air generated by an air compressor (not shown) enters, the gas outlet 22 through which compressed air exits toward the pneumatic actuator, and the gas inlet 21 and the gas outlet 22 to communicate with each other. And a flow path 23 through which the water passes. Moreover, the air dryer 20 is provided with the desiccant 24 which is arrange | positioned on the flow path 23 and dries compressed air.

  The multi-circuit protection valve 30 distributes the compressed air from the air dryer 20 to a plurality of circuits, and when a failure occurs in any of the plurality of circuits, the valve corresponding to the circuit in which the failure occurs is closed. It protects other circuits.

  The pressure detection device 100 detects the pressure of compressed air in the flow path 31 of the multi-circuit protection valve 30. When the pressure detected by the pressure detection device 100 is low, pneumatic actuators such as brakes and suspensions do not operate. Therefore, the pressure detected by the pressure detection device 100 can be used, for example, to determine whether or not to output an alarm by the vehicle control device.

  FIG. 4 is a top view of the pressure detection device 100. FIG. 5 is a cross-sectional view of the pressure detection device 100 in a state where it is fixed to the multi-circuit protection valve 30. FIG. 6 is an exploded perspective view of the pressure detection device 100.

  As shown in FIGS. 4 to 6, the pressure detection device 100 is installed in two pressure sensor modules 110 that detect the pressure of compressed air, a sensor base 120 in which the pressure sensor module 110 is installed, and the sensor base 120. A sensor cover 130 that covers the pressure sensor module 110, and a flat washer 140 and a screw 150 as fixing means of the present invention that presses and fixes the sensor cover 130 to the sensor base 120 in the direction indicated by the arrow 100a.

  The pressure sensor module 110 is sandwiched between an O-ring 123 (described later) of the sensor base 120 and a protrusion 131b (described later) of the sensor cover 130 when the sensor cover 130 is pressed against the sensor base 120 by the flat washer 140 and the screw 150. Is fixed.

  FIG. 7 is a cross-sectional view of the pressure sensor module 110.

  As shown in FIG. 7, the pressure sensor module 110 is bonded and fixed to a ceramic substrate 111 having a pressure introduction hole 111a into which compressed air pressure is introduced, and the position of the pressure introduction hole 111a on the substrate 111. Pressure sensor chip 112, wire 113 that transmits the output signal of pressure sensor chip 112 to the wiring of substrate 111, electronic component 114 that is mounted on substrate 111 and processes the output signal of pressure sensor chip 112, and substrate 111 The resin cover 115 that covers the pressure sensor chip 112 and the electronic component 114 installed in the apparatus and the silicon gel 116 that protects the pressure sensor chip 112 and the electronic component 114 are provided.

  The cover 115 is formed with two holes 115a for the silicon gel 116 to be injected. The silicon gel 116 is injected from the outside of the space surrounded by the substrate 111 and the cover 115 into the inside through the hole 115 a of the cover 115.

  As shown in FIGS. 5 and 6, the sensor base 120 includes two bases 121 made of rubber for surrounding the hole 31 a of the metal base body 121 and the multi-circuit protection valve 30 and preventing leakage of compressed air by elasticity. A ring 122 and two O-rings 123 as sealing members of the present invention that surround the pressure introduction hole 111a of the pressure sensor module 110 and prevent leakage of compressed air by elasticity are provided. The hole 31a of the multi-circuit protection valve 30 communicates with the flow path 31 (see FIG. 3).

  The base body 121 includes two grooves 121a in which the O-ring 122 is installed, two grooves 121b in which the O-ring 123 is installed, two holes 121c that communicate with the grooves 121a and 121b, and two holes 121c. Two holes 121d, which are arranged at the sandwiched positions and into which the screws 150 are inserted, and a groove 121e into which a later-described claw portion 131a of the sensor cover 130 fits are formed. In addition, the base body 121 has a wall 121f as a movement restricting portion of the present invention that restricts the movement of the pressure sensor module 110 in a direction orthogonal to the direction indicated by the arrow 100a, and a direction opposite to the direction indicated by the arrow 100a. And an insertion portion 121g that is inserted into a hole 131c (described later) of the cover main body 131. The wall 121f is disposed at a position that restricts the movement of the pressure sensor module 110 within a range in which the O-ring 123 is maintained in a state in which the O-ring 123 surrounds the pressure introduction hole 111a of the pressure sensor module 110. A hole 121d is opened in the insertion portion 121g.

  The O-ring 123 is in contact with the pressure sensor module 110 and constitutes a base side contact portion of the present invention.

  FIG. 8 is a bottom view of the sensor cover 130.

  As shown in FIGS. 4 to 6 and FIG. 8, the sensor cover 130 includes a resin cover main body 131 and a plurality of electrode pins 132 installed through the cover main body 131.

  The cover main body 131 includes a claw portion 131a that fits in the groove 121e of the sensor base 120, and a protrusion 131b that protrudes toward the O-ring 123 of the sensor base 120. Further, the cover body 131 has a hole 131c into which the insertion portion 121g of the sensor base 120 is inserted.

  Since the sensor cover 130 is temporarily fixed to the sensor base 120, the claw portion 131a is hooked on the sensor base 120 by fitting into the groove 121e of the sensor base 120.

  The protrusion 131b is in contact with the pressure sensor module 110 and constitutes the cover side contact portion of the present invention. The protrusion 131b is disposed in the direction opposite to the direction indicated by the arrow 100a with respect to the O-ring 123 of the sensor base 120.

  A lead wire 101 connected to the wiring of the substrate 111 of the pressure sensor module 110 is connected to the electrode pin 132. The electrode pin 132 is an electrode pin for outputting a signal output from the pressure sensor chip 112 and processed by the electronic component 114 to the outside of the pressure detection device 100.

  The screw 150 is screwed into a screw hole 30 a formed in the multi-circuit protection valve 30, which is an external member disposed on the side opposite to the sensor cover 130 side with respect to the sensor base 120. The flat washer 140 and the screw 150 press and fix the pressure detection device 100 to the multi-circuit protection valve 30 by pressing the sensor cover 130 toward the multi-circuit protection valve 30 side.

  Next, a method for manufacturing the pressure detection device 100 will be described.

  First, the wiring of the substrate 111 of the pressure sensor module 110 and the electrode pin 132 of the sensor cover 130 are connected by the lead wire 101.

  Next, the pressure sensor module 110 connected by the sensor cover 130 and the lead wire 101 is disposed in the space surrounded by the wall portion 121 f in the sensor base 120.

  Next, the sensor cover 130 is moved in the direction indicated by the arrow 100a so that the insertion portion 121g of the sensor base 120 is inserted into the hole 131c, and the claw portion 131a fits into the groove 121e of the sensor base 120. Therefore, the sensor cover 130 is temporarily fixed to the sensor base 120. The pressure sensor module 110 is sandwiched between the O-ring 123 of the sensor base 120 and the protrusion 131b of the sensor cover 130 and temporarily fixed. At this time, the O-ring 123 is deformed by the pressure sensor module 110 pressed by the sensor cover 130 in the direction indicated by the arrow 100a, and the pressure sensor module 110 is opposite to the direction indicated by the arrow 100a by the restoring force. Is pushing back.

  Finally, the screw 150 passed through the flat washer 140 is passed through the hole 121 d of the sensor base 120 and screwed into the screw hole 30 a of the multi-circuit protection valve 30. Accordingly, the sensor cover 130 is pressed and fixed to the sensor base 120 in the direction indicated by the arrow 100a by being pressed toward the multi-circuit protection valve 30 by the flat washer 140 and the screw 150. The sensor base 120 is pressed against the multi-circuit protection valve 30 by the sensor cover 130 in the direction indicated by the arrow 100a by the sensor cover 130 being pressed by the flat washer 140 and the screw 150 in the direction indicated by the arrow 100a. Fixed. At this time, the O-ring 122 is deformed by the base body 121 pressed in the direction indicated by the arrow 100a by the sensor cover 130, and the base body 121 is pushed back in the direction opposite to the direction indicated by the arrow 100a by the restoring force. ing. Further, the pressure sensor module 110 is configured such that the sensor cover 130 is pressed against the sensor base 120 in the direction indicated by the arrow 100 a by the flat washer 140 and the screw 150, whereby the O-ring 123 of the sensor base 120 and the protrusion 131 b of the sensor cover 130. It is sandwiched between and fixed. At this time, the O-ring 123 is deformed by the pressure sensor module 110 pressed by the sensor cover 130 in the direction indicated by the arrow 100a, and the pressure sensor module 110 is opposite to the direction indicated by the arrow 100a by the restoring force. Is pushing back.

  As described above, the air dryer 10 with a pressure detection device and the pressure detection device 100 can also fix the pressure sensor module 110 to the sensor base 120 by the flat washer 140 and the screw 150 that fix the sensor cover 130 to the sensor base 120. Since this is done, the number of parts can be reduced as compared with the prior art. Therefore, the air dryer 10 with a pressure detection device and the pressure detection device 100 can reduce, for example, the manufacturing cost and facilitate the manufacturing work, as compared with the conventional case.

  Moreover, since the air dryer 10 with a pressure detection apparatus and the pressure detection apparatus 100 also fix the pressure detection apparatus 100 to the multi-circuit protection valve 30 by the flat washer 140 and the screw 150 which fix the sensor cover 130 to the sensor base 120, Compared to the configuration in which the pressure detection device 100 is fixed to the multi-circuit protection valve 30 by means other than the flat washer 140 and the screw 150 for fixing the sensor cover 130 to the sensor base 120, the number of components can be reduced.

  Further, the pressure detection device 100 can be unitized before being fixed to the multi-circuit protection valve 30 by temporarily fixing the sensor cover 130 to the sensor base 120 by the claw portion 131a. Fixing work to the protection valve 30 can be facilitated.

  Further, in the pressure detection device 100, since the O-ring 123 of the sensor base 120 is disposed with respect to the protrusion 131b of the sensor cover 130 in the direction indicated by the arrow 100a, the pressure sensor module 110 is formed by the protrusion 131b of the sensor cover 130. Can be strongly pressed against the O-ring 123 of the sensor base 120.

  Further, in the pressure detection device 100, the state in which the O-ring 123 of the sensor base 120 surrounds the pressure introduction hole 111a of the pressure sensor module 110 is maintained by the wall portion 121f of the sensor base 120. Compared with a configuration in which the pressure sensor module 110 can move until the 111a is not surrounded by the sensor-based O-ring 123, handling can be facilitated.

  Further, in the pressure detection device 100, since the sensor cover 130 presses the pressure sensor module 110 against the sensor base 120 by the protrusion 131b, the space in which the lead wire 101 can be arranged is placed in the pressure sensor module 110 and the sensor cover 130. And the occurrence of a problem that the lead wire 101 is sandwiched between the pressure sensor module 110 and the sensor cover 130 can be suppressed.

(Second Embodiment)
First, the structure of the air dryer with a pressure detection device according to the present embodiment will be described.

  The configuration of the air dryer with a pressure detection device according to the present embodiment is the same as the configuration of the air dryer with a pressure detection device 10 according to the first embodiment (see FIG. 1) except for the pressure detection device.

  FIG. 9 is a cross-sectional view of the pressure detection device 200 according to the present embodiment in a state of being fixed to the multi-circuit protection valve 30.

  Among the configurations of the pressure detection device 200 shown in FIG. 9, the same configurations as those of the pressure detection device 100 (see FIG. 5) are denoted by the same reference numerals as the configuration of the pressure detection device 100 and will be described in detail. Omitted.

  The pressure detection device 200 includes two pressure sensor modules 110 that detect the pressure of compressed air, a sensor base 220 in which the pressure sensor module 110 is installed, and a sensor cover 230 that covers the pressure sensor module 110 installed in the sensor base 220. A flat washer 140 and a screw 250 as fixing means of the present invention for pressing and fixing the sensor cover 230 to the sensor base 220 in the direction indicated by the arrow 100a, and the multi-circuit protection valve in the direction indicated by the arrow 100a. And a screw 290 that is pressed against and fixed to 30.

  The configuration of the sensor base 220 is the same as the configuration provided in the sensor base 120 (see FIG. 5) in place of the base body 221 made of metal instead of the base body 121 (see FIG. 5).

  The base body 221 includes two grooves 121a in which the O-ring 122 is installed, two grooves 121b in which the O-ring 123 is installed, two holes 121c that communicate the grooves 121a and 121b, and two holes 121c. Two screw holes 221a that are arranged at the sandwiching positions and into which the screws 250 are screwed, and two holes 221b that are arranged at the positions sandwiching the two screw holes 221a and into which the screws 290 are inserted are formed. The base body 221 has a wall 121f as a movement restricting portion of the present invention that restricts the movement of the pressure sensor module 110 in a direction orthogonal to the direction indicated by the arrow 100a, and a direction opposite to the direction indicated by the arrow 100a. And an insertion portion 121g that is inserted into the hole 131c of the cover main body 131. The wall 121f is disposed at a position that restricts the movement of the pressure sensor module 110 within a range in which the O-ring 123 is maintained in a state in which the O-ring 123 surrounds the pressure introduction hole 111a of the pressure sensor module 110. A screw hole 221a is opened in the insertion part 121g.

  The configuration of the sensor cover 230 is the same as the configuration in which the sensor cover 130 (see FIG. 5) is provided instead of the resin cover main body 231 in place of the cover main body 131 (see FIG. 5).

  The cover main body 231 includes a protrusion 131 b that protrudes toward the O-ring 123 of the sensor base 220. The cover body 231 has a hole 131c into which the insertion portion 121g of the sensor base 220 is inserted.

  The screw 250 is screwed into a screw hole 221 a formed in the sensor base 220. The flat washer 140 and the screw 250 fix the sensor cover 230 by pressing it against the sensor base 220.

  The screw 290 is screwed into a screw hole 30 a formed in the multi-circuit protection valve 30 and presses and fixes the pressure detection device 200 to the multi-circuit protection valve 30.

  Next, a method for manufacturing the pressure detection device 200 will be described.

  First, the wiring of the substrate 111 of the pressure sensor module 110 and the electrode pin 132 of the sensor cover 230 are connected by the lead wire 101.

  Next, the pressure sensor module 110 connected to the sensor cover 230 and the lead wire 101 is disposed in a space surrounded by the wall portion 121 f in the sensor base 220.

  Next, the sensor cover 230 is moved in the direction indicated by the arrow 100a so that the insertion portion 121g of the sensor base 220 is inserted into the hole 131c.

  Next, the screw 250 passed through the flat washer 140 is screwed into the screw hole 221 a of the sensor base 220. Therefore, the sensor cover 230 is pressed and fixed to the sensor base 220 in the direction indicated by the arrow 100a by the flat washer 140 and the screw 250. The pressure sensor module 110 is configured such that the sensor cover 230 is pressed against the sensor base 220 in the direction indicated by the arrow 100a by the flat washer 140 and the screw 250, whereby the O-ring 123 of the sensor base 220 and the protrusion 131b of the sensor cover 230. It is sandwiched between and fixed. At this time, the O-ring 123 is deformed by the pressure sensor module 110 pressed in the direction indicated by the arrow 100a by the sensor cover 230, and the pressure sensor module 110 is opposite to the direction indicated by the arrow 100a by the restoring force. Is pushing back.

  Finally, the screw 290 is passed through the hole 221 b of the sensor base 220 and screwed into the screw hole 30 a of the multi-circuit protection valve 30. Accordingly, the sensor base 220 is pressed and fixed to the multi-circuit protection valve 30 in the direction indicated by the arrow 100a by the screw 290. At this time, the O-ring 122 is deformed by the base body 221 pressed in the direction indicated by the arrow 100a by the screw 290, and the base body 221 is pushed back in the direction opposite to the direction indicated by the arrow 100a by the restoring force. Yes.

  As described above, the air dryer with a pressure detection device and the pressure detection device 200 according to the present embodiment have the pressure sensor for the sensor base 220 by the flat washer 140 and the screw 250 that fix the sensor cover 230 to the sensor base 220. Since the module 110 is also fixed, the number of parts can be reduced as compared with the prior art. Therefore, for example, the air dryer with a pressure detection device and the pressure detection device 200 according to the present embodiment can reduce the manufacturing cost and facilitate the manufacturing operation, as compared with the conventional case.

  Further, in the pressure detection device 200, the O-ring 123 of the sensor base 220 is disposed with respect to the protrusion 131b of the sensor cover 230 in the direction indicated by the arrow 100a. Can be strongly pressed against the O-ring 123 of the sensor base 220.

  Further, in the pressure detection device 200, the state in which the O-ring 123 of the sensor base 220 surrounds the pressure introduction hole 111 a of the pressure sensor module 110 is maintained by the wall 121 f of the sensor base 220. Compared with a configuration in which the pressure sensor module 110 can move until the 111a is not surrounded by the sensor-based O-ring 123, handling can be facilitated.

  Further, in the pressure detection device 200, the sensor cover 230 presses the pressure sensor module 110 against the sensor base 220 by the protrusion 131b, so that the space in which the lead wire 101 can be placed is the pressure sensor module 110 and the sensor cover 230. And the occurrence of a problem that the lead wire 101 is sandwiched between the pressure sensor module 110 and the sensor cover 230 can be suppressed.

(Third embodiment)
The structure of the air dryer with a pressure detection device according to the present embodiment will be described.

  The configuration of the air dryer with a pressure detection device according to the present embodiment is the same as the configuration of the air dryer with a pressure detection device 10 according to the first embodiment (see FIG. 1) except for the pressure detection device.

  FIG. 10 is a cross-sectional view of the pressure detection device 300 according to the present embodiment in a state where it is fixed to the multi-circuit protection valve 30.

  Of the configuration of the pressure detection device 300 shown in FIG. 10, the same configuration as the configuration of the pressure detection device 100 (see FIG. 5) is denoted by the same reference numerals as the configuration of the pressure detection device 100, and detailed description will be given. Omitted.

  The configuration of the pressure detection device 300 includes two pressure sensor modules 310 that detect the pressure of compressed air, and a sensor cover 330 that covers the pressure sensor module 310 installed on the sensor base 120. The pressure sensor module 110 (see FIG. 5). .) And the sensor cover 130 (see FIG. 5).

  The configuration of the pressure sensor module 310 is the same as the configuration in which the pressure sensor module 110 increases the thickness in the direction indicated by the arrow 100a.

  The configuration of the sensor cover 330 is the same as the configuration in which the sensor cover 130 (see FIG. 5) is provided instead of the resin cover main body 331 in place of the cover main body 131 (see FIG. 5).

  The configuration of the cover main body 331 is the same as the configuration in which the cover main body 131 does not include the protrusion 131b (see FIG. 5). The cover main body 331 includes a flat cover side contact portion 331 a that contacts the pressure sensor module 310.

  Note that the manufacturing method of the pressure detection device 300 is the same as the manufacturing method of the pressure detection device 100, and thus the description thereof is omitted.

  As described above, the air dryer with the pressure detection device and the pressure detection device 300 according to the present embodiment have the pressure sensor to the sensor base 120 by the flat washer 140 and the screw 150 that fix the sensor cover 330 to the sensor base 120. Since the module 310 is also fixed, the number of parts can be reduced as compared with the conventional case. Therefore, the air dryer with a pressure detection device and the pressure detection device 300 according to the present embodiment can reduce the manufacturing cost and facilitate the manufacturing work, for example, as compared with the conventional case.

  In addition, the air dryer with pressure detection device and the pressure detection device 300 according to the present embodiment have a flat washer 140 and a screw 150 for fixing the sensor cover 330 to the sensor base 120 and the pressure detection device 300 to the multi-circuit protection valve 30. Since the fixing is also performed, the components are compared with the configuration in which the pressure detection device 300 is fixed to the multi-circuit protection valve 30 by means other than the flat washer 140 and the screw 150 for fixing the sensor cover 330 to the sensor base 120. Can be reduced.

  In addition, the pressure detection device 300 can be unitized before being fixed to the multi-circuit protection valve 30 by temporarily fixing the sensor cover 330 to the sensor base 120 by the claw portion 131a. Fixing work to the protection valve 30 can be facilitated.

  Further, in the pressure detection device 300, the state in which the O-ring 123 of the sensor base 120 surrounds the pressure introduction hole 111a of the pressure sensor module 310 is maintained by the wall 121f of the sensor base 120. Compared to a configuration in which the pressure sensor module 310 can move until the 111a is not surrounded by the sensor-based O-ring 123, handling can be facilitated.

(Fourth embodiment)
First, the structure of the air dryer with a pressure detection device according to the present embodiment will be described.

  As shown in FIG. 11, the configuration of the air dryer with a pressure detection device according to the present embodiment is the same as that of the air dryer 10 with the pressure detection device according to the first embodiment (see FIG. 1) except for the pressure detection device 400. It is the same as that of the structure. In FIG. 11, among the configurations of the air dryer with a pressure detection device according to the present embodiment, the same configurations as those of the air dryer 10 with a pressure detection device are denoted by the same reference numerals as those of the air dryer 10 with a pressure detection device. Detailed description is omitted.

  The configuration of the pressure detection device 400 is the same as the configuration of the pressure detection device 100 (see FIGS. 4 to 6) according to the first embodiment, as shown in FIGS. 12 to 22, among the configurations of the pressure detection device 400, configurations similar to the configuration of the pressure detection device 100 are denoted by the same reference numerals as those of the pressure detection device 100, and detailed description thereof is omitted. The thin lines shown in FIGS. 12, 18 and 19 are all lines representing the shape of the three-dimensional surface. 21 and 22, the lead wire 101, the pressure sensor module 110, and the O-ring 123 (see FIG. 5) are not drawn.

  Although the pressure detection device 400 is slightly different from the shape of the pressure detection device 100 according to the first embodiment, the same effect as the pressure detection device 100 can be obtained. Therefore, the air dryer with a pressure detection device according to the present embodiment can obtain the same functions and effects as those of the air dryer with a pressure detection device 10 according to the first embodiment.

  The fixing means of the present invention is constituted by a flat washer and a screw in each of the above-described embodiments. However, if the sensor cover can be pressed and fixed to the sensor base in the direction indicated by the arrow 100a, the flat washer can be used. It may also be constituted by something other than screws.

  The pressure detection device is fixed to the air dryer 20 via the multi-circuit protection valve 30 in each of the above-described embodiments, but is directly fixed to the air dryer 20 and detects the pressure of the compressed air in the air dryer 20. It may be like this.

  Further, in each of the above-described embodiments, the pressure detection device detects the compressed air that has exited from the air dryer 20, but is not limited to the compressed air that has exited from the air dryer 20, and detection of the pressure of any gas. Can be used. That is, the pressure detection device of the present invention is not limited to the air dryer 20 or the multi-circuit protection valve 30 and can be fixed to any member.

  In addition, the pressure detection apparatus in each embodiment mentioned above can also be used as a sensor which detects a negative pressure (vacuum pressure).

10 Air dryer 30 Multi-circuit protection valve (external member, passage forming part)
31 flow path (gas passage)
DESCRIPTION OF SYMBOLS 100 Pressure detection apparatus 101 Lead wire 110 Pressure sensor module 111a Pressure introduction hole 120 Sensor base 121f Wall part (movement control part)
123 O-ring (base side contact part, sealing member)
130 Sensor cover 131a Claw part 131b Protrusion part (cover side contact part)
132 Electrode pin 140 Flat washer (fixing means)
150 screws (fixing means)
200 Pressure detecting device 220 Sensor base 230 Sensor cover 250 Screw (fixing means)
DESCRIPTION OF SYMBOLS 300 Pressure detection apparatus 310 Pressure sensor module 330 Sensor cover 331a Cover side contact part 400 Pressure detection apparatus

Claims (7)

A pressure sensor module for detecting the pressure of the gas; a sensor base on which the pressure sensor module is installed; a sensor cover for covering the pressure sensor module installed on the sensor base; and pressing the sensor cover against the sensor base. Fixing means for fixing,
The sensor base includes a base side contact portion that contacts the pressure sensor module,
The sensor cover includes a cover side contact portion that contacts the pressure sensor module,
The pressure sensor module, wherein the sensor cover is pressed against the sensor base by the fixing means, and is sandwiched and fixed between the base side contact portion and the cover side contact portion.   The fixing means presses and fixes the pressure detection device to the external member by pressing the sensor cover to an external member side disposed on the opposite side of the sensor base to the sensor base. The pressure detection device according to claim 1.   The pressure detection device according to claim 2, wherein the sensor cover includes a claw portion that is hooked on the sensor base and temporarily fixes the sensor cover to the sensor base. The pressure sensor module has a pressure introduction hole into which the pressure is introduced,
The base side contact portion includes a sealing member that surrounds the pressure introducing hole and prevents the gas from leaking by elasticity,
The cover side contact portion includes a protruding portion protruding toward the sealing member side,
The said sealing member is arrange | positioned in the direction which the said fixing means presses the said sensor cover with respect to the said sensor base with respect to the said projection part, The Claim 1 characterized by the above-mentioned. Pressure detection device. The pressure sensor module has a pressure introduction hole into which the pressure is introduced,
The base side contact portion includes a sealing member that surrounds the pressure introducing hole and prevents leakage of the gas,
The sensor base includes a movement restricting portion that restricts movement of the pressure sensor module in a direction perpendicular to a direction in which the fixing means presses the sensor cover against the sensor base.
The pressure detection according to any one of claims 1 to 3, wherein the movement restricting portion restricts the movement within a range in which the state in which the sealing member surrounds the pressure introducing hole is maintained. apparatus. The sensor cover includes an electrode pin for outputting a signal output from the pressure sensor module to the outside of the pressure detection device,
The pressure detection device includes a lead wire for connecting the wiring of the pressure sensor module and the electrode pin,
The pressure detection device according to any one of claims 1 to 3, wherein the cover side contact portion includes a protrusion protruding toward the base side contact portion. An air dryer that dries the gas by allowing the compressed gas to pass through; a passage forming portion that is formed in a gas passage that passes the gas that has exited from the air dryer and is fixed to the air dryer; and the passage forming portion And a pressure detection device that detects the pressure of the gas in the gas passage.
The pressure detection device includes a pressure sensor module that detects the pressure, a sensor base on which the pressure sensor module is installed, a sensor cover that covers the pressure sensor module installed on the sensor base, and the sensor cover. And a fixing means for pressing and fixing to the sensor base,
The passage forming portion is disposed on the side opposite to the sensor cover side with respect to the sensor base,
The fixing means presses and fixes the pressure detection device to the passage forming portion by pressing the sensor cover to the passage forming portion side,
The sensor base includes a base side contact portion that contacts the pressure sensor module,
The sensor cover includes a cover side contact portion that contacts the pressure sensor module,
The pressure sensor module is equipped with a pressure detection device, wherein the sensor cover is sandwiched and fixed between the base side contact portion and the cover side contact portion when the sensor cover is pressed against the sensor base by the fixing means. Air dryer.

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