JPH11118646A - Connecting structure for pressure detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connecting structure for a pressure detector having high durability and reliability. SOLUTION: The pressure detector 1 comprises a detector body 2, a pressure detecting means 8 contained in the body 2, and a pressure guide channel 73 for guiding fluid to be detected to the means 8. A detector side engaging part 72 attachable to or detachable from an introducing member side engaging part 71 of fluid-to-be-detected introducing member 61 is provided at the body 2. The channel 73 for communicating a channel R2 of the member 61 side opened at the part 71 with an interior of the body 2 is formed at the part 72. The parts 71 and 72 are connected by using a locking fitting 74 for allowing relative rotation of both the parts 71 and 72 and latching them so as not to be detached. A sealing member 77 is interposed at the boundary between the parts 71 and 72.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure detector,
In particular, the present invention relates to a structure for connecting a pressure detector to a flow path of a fluid introduction member to be detected.

[0002]

2. Description of the Related Art Conventionally, various fluid pressure actuators utilizing pneumatic or hydraulic pressure have been proposed. In order to suitably drive and control the fluid pressure actuator, it is necessary to accurately grasp the pressure of the fluid supplied through the pipe or tube by any means. As means for achieving such an object, for example, a pressure detector typified by a pressure switch or the like is known.

[0003] The conventional pressure detector disclosed in Japanese Patent Application Laid-Open No. 8-75585 has the following features.
A pressure sensor for detecting the pressure of the pressurized fluid is housed inside the casing of the pressure detector. Outside the casing, a cylindrical portion having a pressure introduction port is provided. A through hole facing the pressure sensor in the casing is defined in the cylindrical portion. The tubular portion is detachably connected to an opening of a one-touch fitting, which is a part of a pipe connection mechanism. As a result, the fluid flowing through the fluid supply tube is introduced into the casing via the pipe connection mechanism and the through hole, and the pressure is detected by the pressure sensor.

[0004]

However, in the above-mentioned prior art, since a structure in which a tubular portion is connected to an opening of a one-touch fitting is adopted, a one-touch pipe is provided on the outer peripheral surface of the tubular portion. The claw of the annular locking chuck of the joint is bitten. Therefore, it is extremely difficult to rotate the pressure detector about the axial direction of the one-touch fitting when the tubular portion is connected to the one-touch fitting.
Further, if the pressure detector is forcibly rotated in the above-described connection state, the outer peripheral surface of the cylindrical portion is damaged. Therefore, if used for a long period of time, fluid may leak from the connection portion, making it impossible to accurately detect pressure, or the tubular portion itself may fall out of the one-touch fitting. Therefore, conventionally, in order to rotate the pressure detector, it is necessary to once detach the tubular portion from the one-touch fitting.

Further, if the connection portion is of the prior art structure in which it cannot rotate, an excessive force is likely to be applied to the base of the lead wire drawn out of the casing, leading to problems such as deterioration of the sealing property of the portion and disconnection. Cheap.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a highly durable and reliable connection structure for a pressure detector.

[0007]

According to the first aspect of the present invention, there is provided a detector body, a pressure detecting means housed inside the detector body, and a fluid to be detected. For connecting a pressure detector having a pressure guiding flow path for guiding pressure to the pressure detecting means to a flow path on the test fluid introducing member side, wherein the test fluid introducing member includes an introducing member side fitting. A detector-side fitting portion that can be fitted to and removed from the mating portion is provided in the detector main body, and the flow path on the side of the test fluid introducing member that opens at the introducing member-side fitting portion and the inside of the detector main body. Are formed in the detector-side fitting portion, and the locking portion that allows relative rotation between the two fitting portions and prevents them from coming off is used. Pressure detection, wherein the two members are irremovably connected to each other and a seal member is interposed at an interface between the two fitting portions. The connecting structure and its gist.

According to the second aspect of the present invention, there is provided a pressure sensor having a detector main body, pressure detecting means housed inside the detector main body, and a pressure guiding flow path for guiding a test fluid to the pressure detecting means. A structure for connecting the detector to the flow path on the side of the test fluid introducing member, wherein the detector-side fitting portion capable of being detachably fitted to the introducing member-side fitting portion of the test fluid introducing member is provided. A pressure guiding flow path that is provided in the detector main body and communicates the flow path on the test fluid introducing member side that opens at the introducing member side fitting portion and the inside of the detector main body is provided on the detector side fitting portion. Forming
By engaging slidably with a locked portion formed on one of the outer peripheral surfaces of the two fitting portions, the relative rotation between the two fitting portions is allowed while allowing the relative rotation between the two fitting portions. A connection structure for a pressure detector, characterized in that the fitting parts are irremovably connected to each other by using a locking member for preventing the fitting of the pressure detector, and a seal member is interposed at an interface between the fitting parts. Is the gist.

According to a third aspect of the present invention, in the first or second aspect, the seal member is an annular elastic body, and the interface between the two fitting portions is mainly formed by an elastic return force acting in its own radial direction. It was said that it was to be sealed.

[0010] The invention described in claim 4 is the first to third aspects of the present invention.
In any one of the above, the seal member is disposed on the back side of the locking member. According to a fifth aspect of the present invention, in the third aspect, the annular elastic body is mounted in an annular mounting groove provided in the fitting portion.

[0011] The invention described in claim 6 is the first to fifth aspects.
In any one of the above, the introduction member-side fitting portion of the subject fluid introduction member has a fitting concave portion having a circular cross section, and the detector-side fitting portion has a fitting projection having a circular cross section. It was assumed to be.

According to a seventh aspect of the present invention, in the sixth aspect, the locked portion is an annular locked groove formed on an outer peripheral surface of the fitting projection. According to an eighth aspect of the present invention, in the seventh aspect, the annular mounting groove is formed on the outer peripheral surface of the fitting projection at a more distal end side than the locked groove.

According to a ninth aspect of the present invention, in the seventh or eighth aspect, the test fluid introducing member is provided with a stopper insertion hole extending in a direction perpendicular to the axial direction of the two fitting portions. The locking tool is slidably engaged with the locked groove by being inserted into the locking tool insertion hole.

According to a tenth aspect of the present invention, in the ninth aspect, the locking member is a substantially U-shaped pin. According to an eleventh aspect of the present invention, in the tenth aspect, the substantially U-shaped pin is made of a metal material having a spring property.

According to a twelfth aspect of the present invention, in the tenth or eleventh aspect, the substantially U-shaped pin is retained in the locking hole insertion / extraction hole in the vicinity of the entrance side of the engagement / removal hole so as not to fall off. Holding projections are formed.

According to a thirteenth aspect of the present invention, in any one of the tenth to twelfth aspects, the inlet side of the locking tool insertion hole is wider than the inner side. Claim 14
In the invention described in any one of claims 6 to 13, the test fluid introducing member may include a first region having an outer peripheral surface having a circular shape and a second region having an outer peripheral surface having a polygonal shape. And the test fluid introduction pipe has the fitting concave portion provided in a through hole opened at an end portion on the second region side.

According to a fifteenth aspect of the present invention, in any one of the sixth to thirteenth aspects, the test fluid introducing member has a first region having a circular outer peripheral surface and a polygonal outer peripheral surface. A second region, wherein the fitting recess is provided in a through hole that opens at an end on the second region side, and a male screw groove is formed on an outer peripheral surface of the first region. It was determined that the test fluid introduction pipe was used.

According to a sixteenth aspect of the present invention, in any one of the sixth to thirteenth aspects, the test fluid introducing member is a pipe connecting mechanism including a plurality of one-touch pipe joints,
It is assumed that the fitting recess is provided in the flow path opened by the pipe connection mechanism.

According to a seventeenth aspect of the present invention, there is provided a test fluid introducing pipe of the threadless type described in claim 14, a fluid introducing pipe of the threaded type described in claim 15, The tube connection mechanism described in claim 16 has the fitting recess of the same standard.

Hereinafter, the "action" of the present invention will be described. According to the first aspect of the present invention, as a result of the test fluid being introduced into the inside of the detector main body through the pressure guiding flow path formed in the detector side fitting portion, the pressure detecting means detects the pressure. . In addition, when the fitting part on the introduction member side and the fitting part on the detector side are fitted, the two fitting parts are not only irremovably connected by the locking tool but also are in a state of being relatively rotatable. . In addition, by interposing the seal member, the sealing property of the interface between the two fitting portions is ensured at any of the rotation positions.
Therefore, even if the pressure detector is still connected to the fluid introduction member, the pressure detector can be freely and freely rotated. Therefore, even if the pressure detector is used for a long time, the outer peripheral surface of the detector-side fitting portion is not damaged, and leakage of fluid from the connection portion and extraction of the fitting portion are reliably avoided. You.

According to the second aspect of the present invention, the test fluid is introduced into the inside of the detector main body through the pressure guiding flow passage formed in the detector-side fitting portion, and as a result, the pressure detecting means has its pressure detected. Is detected. Further, when the detector-side fitting portion is fitted to the introduction member-side fitting portion, the fitting portions are not only irremovably connected to each other by the locking tool but also are in a state of being relatively rotatable. In addition, by interposing the seal member, the sealing property of the interface between the two fitting portions is ensured at any of the rotation positions. Therefore, even if the pressure detector is still connected to the fluid introduction member, the pressure detector can be freely and freely rotated. Therefore, even if the pressure detector is used for a long time, the outer peripheral surface of the detector-side fitting portion is not damaged, and leakage of fluid from the connection portion and extraction of the fitting portion are reliably avoided. You. In particular, in the invention according to the second aspect, since a locking tool of a type which is slidably engaged with the locked portion is used, unlike the conventional type which engages by biting, the opposite side is used. Damage to members is small. Therefore, even when the pressure detector is rotated while the pressure detector is connected to the test fluid introduction member,
The outer peripheral surface of the fitting portion is not damaged.

According to the third aspect of the present invention, a so-called outer diameter seal is achieved by the interposition of the annular elastic body, so that the two fitting portions are not required to be continuously pressed in the fitting direction. High sealing properties are secured at the interface, and relative rotation between the two fitting portions is allowed.

According to the fourth aspect of the present invention, since the seal member is disposed on the back side of the locking member, there is no possibility that the fluid leaks from a portion where the locking member is present, and the sealing member is provided with the sealing member. High sealing properties are secured at the interface.

According to the fifth aspect of the present invention, by mounting the annular elastic body in the annular mounting groove, the elastic body is held at a predetermined position of the fitting portion without displacement. Therefore, a high sealing property is secured at the interface between the two fitting portions.

According to the sixth aspect of the present invention, the fitting projection of the pressure detector can be rotatably fitted to the fitting recess of the fluid introducing member. According to the invention as set forth in claim 7, when the annular locked groove and the locking tool are combined, the locking tool can slidably engage with the outer peripheral surface of the fitting projection. The relative rotation between the fitting projection and the fitting recess is allowed. In addition, since the locking tool contacts the inner wall surface of the locked groove, the fitting projection is prevented from coming off from the fitting recess.

According to the eighth aspect of the present invention, the seal member can be arranged on the back side of the locking member, and there is no possibility that the fluid leaks from a portion where the locking member exists. According to the ninth aspect of the present invention, the locking tool is inserted into the locking tool insertion / extraction hole in a state where both fitting portions are fitted to each other, so that the locking tool slides with respect to the locked groove. As a result of the engaging engagement, the two fitting portions are connected to each other so as to be relatively rotatable and cannot be detached.
Further, when the locking tool is removed from the locking tool insertion / extraction hole, one fitting portion can be detached from the other fitting portion.

According to the tenth aspect of the present invention, when the substantially U-shaped pin serving as the locking tool is used as the locking tool, for example, both arms of the pin are engaged when the pin is inserted into the locking tool insertion hole. It is possible to arrange it in the groove. Therefore, the locking member can be slid on two points on the outer peripheral surface of the fitting projection.

According to the eleventh aspect of the present invention, since the pin is a substantially U-shaped pin made of a metal material having a spring property, the pin is resistant to deformation, and the pin can be easily inserted into and removed from the insertion hole of the locking member. It can be carried out.

According to the twelfth aspect of the present invention, since the locking projection is held in the locking insertion hole by the holding projection so as not to fall off, the fitting portions are more securely connected to each other. According to the thirteenth aspect of the present invention, since the entrance side of the locking tool insertion hole is wider than the back side, the locking tool can be easily inserted and removed.

According to the seventeenth aspect of the present invention, in the plurality of test fluid introducing members having different structures, the fitting recesses are set to the same standard, so that the members can be exchanged with each other. The versatility of the pressure detector increases.

[0031]

BEST MODE FOR CARRYING OUT THE INVENTION

[First Embodiment] A connection structure of a pressure detector 1 according to a first embodiment of the present invention will now be described in detail with reference to FIGS.

The pressure detector 1 of this embodiment is a so-called pressure switch. As shown in FIGS. 1 to 3, the detector main body 2 of the pressure detector 1 is configured by fitting a plurality of main body constituent members. Here, the plurality of main body constituent members refer to four members: a base 3, an upper lid 4, a trimmer cover 5 as a trimmer protector, and a drawer protection cap 6 as a drawer protector.

The base 3 is a bottomed member having a substantially rectangular opening at the top. The base 3 is manufactured by, for example, die molding using a small translucent resin material. When the upper cover 4 is fitted into the upper opening of the base 3, an accommodation space is defined on the inner surface side of the base 3 and the upper cover 4. The circuit board 7 is accommodated in such an accommodation space in a horizontal state. On an upper surface of the circuit board 7, a pressure sensor 8 as pressure detecting means, a trimmer 9 for adjusting a set pressure of the pressure sensor 8, a light emitting diode 10, and the like are mounted. A plurality of connection pads (not shown) are formed on the base end edge on the upper surface side of the circuit board 7, and the conductors of the lead wires 11 are soldered to these connection pads. In the present embodiment, specifically, a semiconductor pressure sensor 8 is used.

The upper surface of the upper cover 4 is slightly inclined toward the tip of the pressure detector 1. A substantially semicircular groove 2 extending along the lateral direction of the pressure detector 1 is formed in the center of the upper surface of the upper lid 4.
1 is formed. A bearing 22 is formed at the center of the groove 21. A display window 23 having a substantially rectangular shape is formed at a position on the distal end side of the bearing portion 22. The display window 23 is arranged corresponding to the position of the light emitting diode 10. The portion of the display window 23 is formed thinner than other portions of the upper lid 4. Further, the outer surface of the portion of the display window 23 is a smooth surface and has relatively high translucency. On the other hand, other portions of the upper lid 4 are rough surfaces, and have relatively small light transmission.

As shown in FIG. 1 and the like, a rectangular cover mounting recess 24 for mounting the trimmer cover 5 is formed at a position closer to the base end than the bearing portion 22. A pair of stoppers 25 protrude from both side edges of the cover mounting recess 24 so as to face each other. The trimmer cover 5 has a substantially rectangular outer shape. A pair of support shafts 26 are provided on the base end side of the trimmer cover 5 so as to face each other. These support shafts 26 are fitted to the bearings 22 formed in the grooves 21 of the upper lid 4 from both sides thereof. Therefore, the trimmer cover 5 can be rotated about the support shaft 26. On the other hand, a notch 27 having a substantially semicircular shape is formed on the tip end side of the trimmer cover 5 for convenience in opening the trimmer cover 5.

A through hole 28 having a substantially circular cross section is formed at the center of the cover mounting recess 24. This through hole 28 is located at a position corresponding to the trimmer 9. Meanwhile, trimmer cover 5
A fitting portion 29 is protrudingly provided at a predetermined position on the lower surface side.
The fitting portion 29 is fitted into the through hole 28 when the trimmer cover 5 is closed. When the trimmer cover 5 is in a closed state, the trimmer cover 5 is retained in the cover mounting recess 24 by engaging with a pair of stoppers 25. As a result, careless opening of the trimmer cover 5 is prevented.

A lead wire lead-out portion 31 is provided on the rear side surface of the base portion 3 so as to project therefrom. The lead wire lead-out section 31 is attached to the detector main body 2.
Is provided with an insertion hole 32 that communicates the accommodation space with the external region of the main body. The lead wire 11 is drawn out through this insertion hole 32. A male screw groove is formed on the entire outer peripheral surface of the lead wire lead-out portion 31. On the other hand, the protective cap 6 fitted to the lead wire lead-out portion 31 also
Has an insertion hole 33 for pulling out. On the inner peripheral surface of the protective cap 6, a female screw groove is formed at a pitch corresponding to the male screw groove. Therefore, the protective cap 6 can be fitted to the lead wire lead-out portion 31 by screwing the male screw groove and the female screw groove.

As shown in FIG. 3, the outer circumferential surface of the fitting portion 29 of the trimmer cover 5 has an annular holding groove 3 as a holding portion.
0 is provided. In the annular holding groove 30, a packing 34 as a sealing member is slidably fitted and held. The packing 34 seals the interface between the fitting portion 29 and the through hole 28 of the upper lid 4. Top lid 4
In the outer peripheral portion of the inner side surface, an endless accommodation groove 35 as a holding portion is provided.
Is provided. An endless packing 36 as a seal member is fitted and held in the endless receiving groove 35 so as not to fall off. This endless packing 36
The interface between the opening edge of the base 3 and the inner surface of the upper lid 4 is sealed. At the interface between the lead wire lead-out portion 31 and the protective cap 6, a packing 37 as a sealing member is held in a compressed state along its own axial direction. The packings 34, 36 and 37 are all made of an elastic material such as rubber.

As shown in FIG. 3, the pressure introducing portion 38 of the pressure sensor 8 projects from the lower surface of the circuit board 7. The pressure introducing portion 38 is fitted into a pressure introducing portion fixing concave portion 39 provided on the bottom surface of the base 3. The interface between the pressure introducing section 38 and the pressure introducing section fixing recess 39 is sealed by a packing 40 as a sealing member.

Next, the tube connecting mechanism 41 will be described. As shown in FIG. 3, the pipe connection mechanism 41 of the present embodiment is provided at a location where a flexible tube 42 through which air as a test fluid flows is cut. The main body 43 constituting the tube connecting mechanism 41 is a hollow resin molded product having a flow path therein. The flow path comprises a main flow path R1 and a sub flow path R2. The main passage R1 is provided in the main body 43.
The opening of the first end 44 and the opening of the second end 45 communicate with each other. The first end 44 and the second end 45 are on the same axis as the axis of the flexible tube 42.
A first one-touch fitting 46 is provided at the opening of the first end 44, and a second one-touch fitting 47 having the same structure is provided at the opening of the second end 45.

As shown in FIG. 3, the one-touch fittings 46 and 47 of the present embodiment include a detachable ring 51, an annular locking chuck 52, a seal ring 53, a chuck holding ring 54, and a sleeve 55. The annular locking chuck 52 is housed in the openings of the first end 44 and the second end 45 with the outer peripheral portion held by the chuck holding ring 54. A plurality of claw portions that bite into the outer peripheral surface of the flexible tube 42 are formed on the inner peripheral portion of the annular locking chuck 52. The seal ring 53 is accommodated on the back side of the annular locking chuck 52 and the chuck holding ring 54. The seal ring 53 has a lip portion on the inner peripheral surface side thereof which is in close contact with the outer peripheral surface of the flexible tube 42. The sleeve 55 is disposed on the inlet side of the annular locking chuck 52 and the chuck holding ring 54. The detachable ring 51 having the tube insertion port 56 is movably accommodated in the sleeve 55. A flange portion is formed on the outer end side of the attachment / detachment ring 51, and a diameter-enlargement action portion capable of contacting the annular locking chuck 52 is formed on the inner end side.

When the flexible tube 42 is inserted into the one-touch fittings 46 and 47 through the tube insertion port 56, the claw portion of the annular locking chuck 52 bites into the outer peripheral surface of the distal end portion, so that the flexible tube 42 cannot be pulled out. Fixed. At this time, the sealing action of the seal ring 53 prevents air leakage from the one-touch fittings 46 and 47 to the outside. When the attachment / detachment ring 51 is immersed inside the opening, the diameter-enlargement action section is moved to the annular locking chuck 5.
Contact 2 As a result, the diameter of the annular locking chuck 52 is increased, and the flexible tube 42 is connected to the annular locking chuck 52.
Released from. That is, the flexible tube 42 can be pulled out of the one-touch fittings 46 and 47 with one touch.

A branch portion 57 projects vertically from the center of the upper surface of the main body 43. The opening of this branch 57 is
It is connected to the main flow path R1 via the sub flow path R2. On the inner peripheral surface of the screwing recess 58 provided at the opening of the branch portion 57,
A female screw groove 59 is formed.

FIGS. 1 to 4 show a test fluid introduction pipe 61 of a threaded type as a test fluid introduction member. The test fluid introduction pipe 61 is provided between the pressure detector 1 and the pipe connection mechanism 41 to introduce air to be detected from the pipe connection mechanism 41 side to the pressure detector 1 side. Play a role. As shown in FIG. 1, the test fluid introduction pipe 61 of the present embodiment is a cylindrical member, and has a first region 62 having a circular outer surface and a second region 62 having a square outer surface. And an area 63. The through-hole 64 having a circular cross section provided in the test fluid introduction pipe 61 has an end (that is, a lower end) belonging to the first region 62 and the second region 6.
3 at the ends (that is, the upper ends). The lower end of the test fluid introduction pipe 61 is connected to the pipe connection mechanism 41, and the upper end of the introduction member side fitting portion 71 is connected to the pressure detector 1. Note that the outer diameter of the first region 62 is set to be substantially the same as the inner diameter of the threaded recess 58 provided at the opening of the branch portion 57.

On the outer peripheral surface of the first area 62, the screwing recess 5 is formed.
A female screw groove 59 formed at the same pitch as the female screw groove 59 formed on the inner peripheral surface of 8 is formed. Therefore, the external thread groove 65
The first region 62 side of the test fluid introduction tube 61 can be detachably connected to the threaded recess 58 by screwing the female thread groove 59 with the threaded recess 58.

Next, a structure for connecting the pressure detector 1 to the test fluid introducing pipe 61 having a thread groove will be described. As shown in FIG. 3, the test fluid introduction pipe 61 is
A fitting concave portion 71a is provided at the center of the upper end portion of the introducing member side fitting portion 71. The fitting recess 71 a has a circular cross section and is provided at the opening of the through hole 64. The detector main body 2 includes a fitting protrusion 72 as a detector-side fitting portion. The fitting projection 72 has a circular cross section and can be fitted into and removed from the fitting recess 71a. The fitting protrusion 72 is provided so as to correspond to a portion of the base 3 where the pressure introducing portion fixing concave portion 39 is formed.

At the center of the fitting projection 72, a pressure guiding channel 7 is provided.
3 are formed. The first end of the pressure guiding channel 73 is open at the tip end surface of the fitting projection 72, and the second end is open within the pressure-introducing-portion fixing recess 39. Therefore, when the pressure detector 1 is connected to the test fluid introducing pipe 61 of the threaded type, the sub-flow path R
2 and the internal region of the detector main body 1 are communicated. Then
The air is guided into the pressure sensor 8 via the pressure introducing section 38, and the pressure of the air can be detected.

As shown in FIG. 3, the fitting projection 72 has a large diameter portion and a small diameter portion. The small diameter portion is located closer to the tip than the large diameter portion. On the outer peripheral surface of the large-diameter portion of the fitting projection 72, an annular locked groove 75 into which a part of the substantially U-shaped pin 74 can be inserted is formed as a locked portion. Fitting projection 7
An annular mounting groove 76 is formed on the outer peripheral surface of the small diameter portion 2. That is, the annular mounting groove 76 is located on the outer peripheral surface of the fitting protrusion 72 on the distal end side with respect to the locked groove 75.
Such an annular mounting groove 76 has O as a sealing member.
A ring 77 is mounted. The O-ring 77 is an annular elastic body, and seals the interface between the fitting recess 71a and the fitting projection 72 mainly by an elastic return force acting in its own radial direction. Therefore, even if the pressing force is not continuously applied to the fitting protrusion 72 along the direction in which the fitting protrusion 72 is fitted to the fitting recess 71a, a high sealing property is secured at the interface. In addition, as shown in FIG.
It is desirable that the ring 77 is disposed on the back side of the substantially U-shaped pin 74 as a locking tool.

As shown in FIGS. 1 and 4, a fitting recess 71a is provided in the second region 63 of the test fluid introducing pipe 61.
Locking tool insertion hole 81 extending in a direction orthogonal to the axial direction of the locking tool. Two locking tool insertion holes 81 are parallel to each other and penetrate the second region 63. These locking tool insertion holes 81 are provided at positions corresponding to the locked grooves 75 when the fitting projections 72 are fitted into the fitting recesses 71a.

The substantially U-shaped pin 74 as a locking member is made of a metal material having a spring property (for example, SUS304 or the like).
As shown in FIG. 4 (f), this pin 74 is formed of a pair of arm portions 74a and a base end side connecting portion 74 connecting the pair of arm portions 74a.
b. The pair of arms 74a can be inserted and removed from the pair of locking tool insertion holes 81. When the pin 74 is inserted, each arm 74a is slidably engaged with the locked groove 75. At this time, the fitting protrusion 72 is in a state of being sandwiched by the both arm portions 74a from the outer peripheral surface side. Further, the both arm portions 74 a of the pin 74 abut against the inner wall surface of the locked groove 75, whereby the fitting recess 7 is formed.
The fitting protrusion 72 is prevented from coming off from the first protrusion 1a. That is, when the pin 74 is inserted, the fitting portions 71, 72
Is in a state of being irremovably connected. However, since the substantially U-shaped pin 74 does not bite into the outer peripheral surface of the fitting projection 72 at all, the relative rotation between the two fitting portions 71, 72 about the axial direction of the fitting recess 71a. Movement is allowed.

As shown in FIG.
A cut-out portion 83 is formed at the entrance side of the device 1. The notch 83 has a holding projection 82 formed therein. The holding projection 82 engages with the base end side connecting portion 74b of the substantially U-shaped pin 74, thereby holding the pin 74 in the locking hole insertion hole 81 so as not to fall off. Thereby, both fitting portions 71, 7
The two can be more reliably connected. FIG.
As shown in (c), the entrance side of both locking tool insertion holes 81 is wider than the depth side. This makes it possible to easily insert and remove the pins 74 into and out of the locking hole insertion / extraction holes 81.

Next, a method of using the pressure detector 1 will be described. First, an appropriate portion of the flexible tube 42 is cut, and the above-described tube connection mechanism 41 is provided between the cut ends. That is, each flexible tube 42 is inserted into the tube insertion port 56 of both the one-touch fittings 46 and 47 of the pipe connection mechanism 41. A test fluid introduction pipe 61 is screwed into the branch portion 57 of the pipe connection mechanism 41. Next, the fitting protrusion 72 on the lower surface side of the pressure detector 1 is replaced with the fitting concave portion 71 on the fluid introduction pipe 61 side.
a. In this state, the pin 74 is inserted into both the lock insertion holes 81, and the fitting portions 71 and 72 are connected to each other so as to be relatively rotatable and cannot be detached. Of course, even in such a connection state, it is possible to change the arrangement state by rotating the pressure detector 1 as needed. Therefore, it is relatively easy to make the base of the lead wire 11 drawn out of the detector main body 2 not bend.

According to the configuration of the present embodiment, however, the pressure detector 1 and the test fluid introduction pipe 61 are connected in advance using the pins 74, and then the test fluid introduction pipe 61 and the pipe connection mechanism 41 are connected. Can also be connected. In this case, even if the connection of the lead wire 11 has already been completed, it is not necessary to rotate the pressure detector 1 itself at the time of connection. That is, using a general-purpose tool (for example, a wrench or the like) having a shape engaging with the second region 63 having a square shape, the test fluid introduction pipe 61 is used.
This is because, by rotating only the pipe, the test fluid introduction pipe 61 can be screwed to the pipe connection mechanism 41. The same applies when the test fluid introduction pipe 61 is detached from the pipe connection mechanism 41.

Now, the characteristic effects of the present embodiment will be enumerated below. (1) According to this embodiment, as described above, not only the two fitting portions 71 and 72 are irremovably connected to each other, but also
These 71 and 72 are in a state where they can be relatively rotated by 360 °. In addition, since the O-ring 77 is interposed at the interface between the fitting portions 71 and 72, the sealing property of the interface is ensured at any of the rotation positions. Therefore, even when the pressure detector 1 is still connected to the test fluid introduction pipe 61,
It is possible to freely rotate the pressure detector 1 without difficulty. Therefore, even if the pressure detector 1 is used for a long time, the outer peripheral surface of the fitting projection 72 is not damaged,
Leakage of air from the connection portion, extraction of the fitting protrusion 72, and the like are reliably avoided. As a result, a highly durable and reliable connection structure of the pressure detector 1 can be realized.

(2) In the present embodiment, a substantially U-shaped pin 74 is used as a locking tool of a type that is slidably engaged with the locked groove 75. For this reason, unlike the conventional type in which the claw portion engages by biting, the damage given to the mating member by the locking member is extremely small. Therefore, even when the pressure detector 1 is rotated while the pressure detector 1 is connected to the test fluid introduction pipe 61, the outer peripheral surface of the fitting protrusion 72 is not damaged.

(3) In the present embodiment, unlike the prior art in which the connection portion cannot rotate, an excessive force is less likely to be applied to the base of the lead wire 11 drawn from the pressure detector 1. Therefore, problems such as deterioration of the sealing property at the base of the lead wire 11 and disconnection are prevented. This is also preferable for improving reliability. In addition, in the present embodiment, the packing 37 is held at the interface between the lead wire lead-out portion 31 and the protective cap 6 in a state of being compressed along its own axial direction. Therefore, a high sealing property is secured in the first place.

(4) In this embodiment, a so-called outer diameter seal is achieved at the interface between the two fitting portions 71 and 72 by interposing the O-ring 77 which is an annular elastic body. for that reason,
Even if the pressing force is not continuously applied along the fitting direction, a high sealing property is secured at the interface between the two fitting portions 71 and 72, and the relative rotation of the two fitting portions 71 and 72 is allowed. . Therefore, the pressure detector 1 can be easily rotated only by applying a small operation force.

(5) In the present embodiment, the annular mounting groove 76 is formed on the outer peripheral surface of the fitting projection 72 on the distal end side with respect to the locked groove 75, and the O-ring 77 is disposed on the back side with respect to the pin 74. doing. Therefore, unlike the case where the positional relationship is temporarily reversed, there is no possibility that air leaks from a certain portion of the pin 74, and a high sealing property is secured at the interface between the two fitting portions 71 and 72. This contributes to improved reliability.

(6) In this embodiment, since the O-ring 77 is mounted in the annular mounting groove 76, the O-ring 77 is held at a predetermined position of the fitting projection 72 without displacement. This also has a positive effect on ensuring a high sealing property at the interface between the two fitting portions 71 and 72, so that the reliability is further improved.

(7) In the present embodiment, the upper end portion 71 of the test fluid introduction pipe 61, which is the introduction member side fitting portion, has a fitting concave portion 71a having a circular cross section. Are fitting projections 72 having a circular cross section. Therefore, the fitting protrusion 72 can be rotatably fitted to the fitting recess 71a. Further, such a structure has the following advantages as compared with a structure in which the fitting concave portion 71a is provided on the pressure detector 1 side. First, since it is not necessary to secure a space in the base portion 3 for recessing the fitting concave portion 71a, it is suitable for downsizing the pressure detector 1. Secondly, it is convenient for mounting and dismounting using a tool. That is, the portion for engaging the tool can be easily secured on the outer peripheral surface of the test fluid introduction pipe 61.

(8) In the present embodiment, the fitting insertion / extraction hole 81 extending in the direction perpendicular to the axial direction of the fitting portions 71 and 72 is provided in the fluid introduction tube 61. The pin 74 serving as a locking tool can be slidably contacted with the locked groove 75 by being inserted into the locking tool insertion hole 81 in a state where the fitting portions 71 and 72 are fitted to each other. Engages. At this time, the two fitting portions 71 and 72 are connected to each other so as to be relatively rotatable and non-separable. Then, the pin 74 is inserted into the stopper insertion hole 81.
Is removed from the fitting recess 71a. With such a structure, a part of the pin 74 can be seen even in the connection state.
Therefore, it can be easily grasped whether or not the two fitting portions 71 and 72 are in a detachable state.

(9) In this embodiment, a substantially U-shaped pin 74 made of a metal material having a spring property is used as a locking member. With such a shape, both arms 74 a of the pin 74 can be arranged in the locked groove 75 when the pin 74 is inserted into the locking tool insertion hole 81. Therefore, the pin 74 can be brought into sliding contact with two points on the outer peripheral surface of the fitting projection 72. In addition, since the pin 74 has a simple structure of a substantially U-shape, the insertion and removal of the pin 74 into and from the locking tool insertion hole 81 can be performed relatively easily. Therefore, excellent workability can be obtained. Further, since the pin 74 is made of a metal material having a spring property, the pin 74 is not easily deformed. Even if deformation occurs, it can be easily replaced with a new one.

(10) In the case of the test fluid introducing pipe 61 having the structure as in the present embodiment, a general-purpose tool is engaged with the second area 63 having an outer peripheral surface having a square shape and is rotated. , Mounting and dismounting work can be performed easily. [Second Embodiment] Next, a connection structure of a pressure detector 1 according to a second embodiment of the present invention will be described in detail with reference to FIGS. Portions common to the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. The test fluid introducing member in the present embodiment is a test fluid introducing pipe 91 of a threadless type having no external thread groove 65 on the outer peripheral surface of the first region 62. The test fluid introduction pipe 91 is characterized in that the first region 62 is formed much longer than in the first embodiment. On the other hand, a third one-touch fitting 93 is provided in the branch portion 57 of the pipe body connection mechanism 92 instead of the threaded recess 58 having the female screw groove 59. In this embodiment, the third one-touch fitting 93 has the same structure as the first and second one-touch fittings 46 and 47.

When the test fluid introduction pipe 91 is inserted into the third one-touch fitting 93 through the tube insertion port 56, the claw portion of the annular locking chuck 52 bites into the outer peripheral surface of the distal end portion of the first region 62. As a result, the test fluid introduction pipe 91 is fixed to the pipe connection mechanism 92 so as not to come out. At this time, the sealing action of the seal ring 53 prevents air leakage from the third one-touch fitting 93 to the outside. When the attachment / detachment ring 51 is immersed inside the opening, the diameter-enlargement action portion comes into contact with the annular locking chuck 52. As a result, the diameter of the annular locking chuck 52 increases, and the first region 62 is released from the annular locking chuck 52. That is, the fluid introduction pipe 9 to be inspected from the third one-touch fitting 93 with one touch.
1 can be removed.

According to the present embodiment, the connection between the pipe connecting mechanism 92 and the test fluid introduction pipe 91 cannot be rotated relative to each other, whereas the test fluid introduction pipe 91 and the pressure detector 1
Can be relatively rotated. Therefore,
Even when the pressure detector 1 is connected to the test fluid introduction pipe 91, the pressure detector 1 can of course be freely and freely rotated. Therefore, similarly to the first embodiment, a highly durable and reliable connection structure of the pressure detector 1 can be realized. [Third Embodiment] Next, a connection structure of a pressure detector 1 according to a third embodiment of the present invention will be described in detail with reference to FIGS. Portions common to the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

The present embodiment is different from the first and second embodiments in that a tube connection mechanism 96 having a plurality of one-touch fittings 46 and 47 is grasped as a fluid introduction member to be tested. In this pipe connection mechanism 96, the upper end of the branching portion 57 is the introduction member side fitting portion 71. At the upper end of the branch portion 57, an auxiliary flow path R2 communicating with the main flow path R1 is open. On the inlet side of the sub flow path R2, there is provided a fitting recess 71a into which the fitting projection 72 on the pressure detector 1 can be fitted.

According to the present embodiment, even if the pressure detector 1 is still connected to the pipe connecting mechanism 96, the pressure detector 1 can be freely and freely rotated. Therefore, similarly to the first embodiment, a highly durable and reliable connection structure of the pressure detector 1 can be realized. Furthermore, the size can be reduced as a whole because the test fluid introduction pipes 61 and 91 are not used.

The present invention is not limited to the above embodiment, but can be modified to another form as follows, for example. The shape of the pin 74 serving as the locking member is not limited to a substantially U-shape, and may be, for example, a substantially V-shape, a substantially J-shape, a substantially L-shape, a substantially I-shape, or the like. The pin 74 may be made of a material other than a metal material, such as a ceramic material or a resin material.

The fluid introduction pipe 61 of the first embodiment is
For example, it is also possible to use by screwing directly to the port of the external pneumatic device. A configuration in which the fitting concave portion 71a is provided on the pressure detector 1 side may be adopted.

The structures of the one-touch fittings 46, 47 and 93 are not limited to those of the first to third embodiments, but may be different from those. ◎ By projecting an annular engaging ridge over the outer opening of the through hole 28 of the upper lid 4, for example, over the entire periphery of the outer opening,
The opening on the side where the fitting portion 29 is fitted may be narrowed.
In this case, it is preferable that the first packing 34 has a slightly larger diameter than that of the embodiment. If such an engaging portion is provided, when the upper lid 4 is closed, the first packing 3
4 engages with the inner surface side of the annular engaging ridge. as a result,
The sliding resistance is increased, and the fitting portion 29 is less likely to come out of the through hole 28. Therefore, even if the pair of stoppers 25 as in the embodiment are not provided, the trimmer cover 5 will not be opened carelessly. Of course, the stopper 2
When used in combination with 5, the inadvertent opening can be more reliably prevented. In addition, the engaging protrusion which is an engaging part does not necessarily need to be formed over the entire circumference of the outer opening, and may be a part thereof. Also, a projection may be used as the engaging portion. A protrusion or the like may be provided on the outer peripheral surface on the first packing 34 side.

The test fluid introduction pipe 61 of the first embodiment having no thread groove, the test fluid introduction pipe 91 of the second embodiment having a thread groove, and the tube connection mechanism 96 of the third embodiment are respectively shown. It is preferable that the fitting recess 71a is manufactured to the same standard. That is, the inner diameter, the depth, the pitch of the female screw groove 59 and the like are set to be the same. If a plurality of test fluid introduction members having different structures are prepared in advance, the members can be exchanged with each other, and as a result, the versatility of the pressure detector 1 is improved.

Here, in addition to the technical ideas described in the claims, the technical ideas grasped by the above-described embodiments are listed below together with their effects. (1) The detector body according to any one of claims 1 to 17, wherein the detector main body is formed by fitting a plurality of main body constituent members, and a seal member is undetachably held at an interface between the main body constituent members. A connection structure for a pressure detector, wherein a holding portion is provided and the sealing member is held by the holding portion. According to this configuration, since the sealing property is improved, the reliability is further improved.

(2) In the technical idea 1, the plurality of main body constituting members may include a bottomed base, an upper lid fitted to an upper opening of the base, and a bearing formed on the upper lid. A spindle portion rotatably fitted with respect to the trimmer protection body having a fitting portion fitted into a through hole formed at a position corresponding to the trimmer in the upper lid; A connection structure for a pressure detector, wherein an annular holding groove is provided on an outer peripheral surface of the trimmer protection body, and a packing is fitted in the annular holding groove. According to this configuration, particularly, the sealing property between the upper lid and the trimmer protection body is improved, so that the reliability is further improved.

(3) In the technical idea 2, the detector main body further includes, as the main body constituent member, a lead-out part protector fitted to a lead wire lead-out part protruding from a side surface of the base. A connection structure for a pressure detector, wherein packing is held at an interface between the lead wire lead-out portion and the lead-out portion protection body in a state of being compressed along its own axial direction. According to this configuration, particularly, the sealing property at the lead lead-out portion is improved, so that the reliability is further improved.

The technical terms used in this specification are defined as follows. “Metal material having spring properties: In addition to ferrous metal materials such as stainless steel represented by SUS304, it includes non-ferrous metal materials.”

[0076]

As described above in detail, according to the first to seventeenth aspects of the present invention, it is possible to provide a highly durable and reliable connection structure for a pressure detector.

According to the third aspect of the present invention, as a result of employing the outer diameter seal, the pressure detector can be easily rotated only by applying a small operating force. Claims 4, 5,
According to the invention described in 8, since a high sealing property is secured at the interface between the both fitting portions, the reliability can be further improved.

According to the invention described in claim 6, a structure suitable for downsizing the pressure detector can be obtained. Claim 7
According to the invention described in (1), since the fitting projection is prevented from coming off from the fitting recess, reliability can be further improved.

According to the tenth, eleventh, and thirteenth aspects of the present invention, it is possible to easily perform the insertion and removal of the locking tool, and it is possible to achieve excellent workability. According to the twelfth aspect, the fitting portions can be more reliably connected to each other, and the reliability can be improved.

According to the seventeenth aspect, the versatility of the pressure detector can be enhanced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a pressure detector and a test fluid introducing pipe with a thread groove according to a first embodiment of the present invention.

FIG. 2A is a left side view of a pressure detector and a test fluid introduction pipe with a thread groove of the first embodiment, FIG. 2B is a front view thereof,
(C) is a rear view, (d) is a right side view, (e) is a plan view, and (f) is a bottom view.

FIG. 3 is a cross-sectional view illustrating a usage state of the pressure detector and the test fluid introduction pipe of the threaded type according to the first embodiment;

4A is a front view of a test fluid introducing pipe with a thread groove according to the first embodiment, FIG. 4B is a cross-sectional view taken along line AA in FIG. 4A, and FIG. Sectional view along line -B, (d)
FIG. 4E is a plan view thereof, FIG. 4E is a cross-sectional view taken along line CC of FIG. 4A, and FIG.

FIG. 5 is a perspective view showing a pressure detector and a test fluid introducing tube of a type without a screw groove according to a second embodiment;

FIG. 6 is a cross-sectional view illustrating a use state of a pressure detector and a test fluid introducing pipe of a type without a thread groove according to a second embodiment.

FIG. 7 is a perspective view showing a pressure detector and a tube connection mechanism of a third embodiment.

FIG. 8 is a sectional view showing a use state of the pressure detector according to the third embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Pressure detector, 2 ... Detector main body, 8 ... Pressure sensor as a pressure detection means, 41, 92 ... Tube connection mechanism, 46,
47, 93 ... one-touch fitting, 61 ... threaded type test fluid introduction pipe as test fluid introduction member, 62 ...
1st area | region, 63 ... 2nd area | region, 64 ... Through-hole, 65 ...
Male thread groove, 71 fitting recess as fitting portion on the introduction member side,
Reference numeral 72 denotes a fitting projection as a detector-side fitting portion, 73 a pressure guiding flow path, 74 a substantially U-shaped pin as a locking member, 75 a ring-shaped locked groove as a locked portion, 76. Annular mounting groove, 77…
O-ring as a sealing member, 81: locking tool insertion / extraction hole, 8
Reference numeral 2 denotes a holding projection, 91 denotes a test fluid introducing pipe of a threadless type as a test fluid introducing member, 96 denotes a pipe connecting mechanism as a test fluid introducing member, R1 denotes a main flow path constituting a flow path,
R2: a sub-channel constituting the channel.

Claims (17)

[Claims] A pressure detector having a detector main body, a pressure detecting means housed inside the detector main body, and a pressure guiding flow path for guiding a test fluid to the pressure detecting means, comprises: A structure for connecting to the flow path on the introduction member side, wherein a detector-side fitting portion that can be fitted to and removed from the introduction member-side fitting portion of the test fluid introduction member is provided on the detector main body. Forming a pressure guiding flow path in the detector-side fitting portion that communicates the flow path on the side of the test fluid introduction member that opens at the introduction-member-side fitting portion with the inside of the detector body; The two fitting portions were irremovably connected to each other by using a locking member that prevents relative removal of the portions while allowing them to rotate relative to each other, and a seal member was interposed at an interface between the both fitting portions. A connection structure for a pressure detector. A pressure detector having a main body of the detector, pressure detecting means housed inside the main body of the detector, and a pressure guiding flow path for guiding the test fluid to the pressure detecting means; A structure for connecting to the flow path on the introduction member side, wherein a detector-side fitting portion that can be fitted to and removed from the introduction member-side fitting portion of the test fluid introduction member is provided on the detector main body. Forming a pressure guiding flow path in the detector-side fitting portion that communicates the flow path on the side of the test fluid introduction member that opens at the introduction-member-side fitting portion with the inside of the detector body; By slidably engaging with a locked part formed on the outer peripheral surface of one of the parts, the two fitting parts are prevented from coming off while allowing relative rotation between the two fitting parts. The two fitting portions are irremovably connected to each other by using a locking tool, and a sealing member is interposed at an interface between the two fitting portions. The connection structure of the pressure detector characterized by being equipped. 3. The seal member according to claim 1, wherein the seal member is an annular elastic body, and seals an interface between the two fitting portions mainly by an elastic return force acting in a radial direction of the seal member. 3. The connection structure of the pressure detector according to 2. 4. The connection structure for a pressure detector according to claim 1, wherein the seal member is disposed at a position deeper than the locking member. 5. The connection structure for a pressure detector according to claim 3, wherein said annular elastic body is mounted in an annular mounting groove provided in said fitting portion. 6. A fitting part on the introduction member side provided in the fluid introduction member for test has a fitting concave part having a circular cross section, and the fitting part on the detector side is a fitting projection having a circular cross section. The connection structure for a pressure detector according to any one of claims 1 to 5, wherein: 7. The connection structure for a pressure detector according to claim 6, wherein said locked portion is an annular locked groove formed on an outer peripheral surface of said fitting projection. 8. The connection structure for a pressure detector according to claim 7, wherein said annular mounting groove is formed on the outer peripheral surface of said fitting projection at a more distal end side than said locked groove. 9. The test fluid introducing member is provided with a locking tool insertion hole extending in a direction perpendicular to the axial direction of the two fitting portions, and the locking tool is provided in the locking tool insertion hole. The connection structure for a pressure detector according to claim 7, wherein the connection structure is slidably engaged with the locked groove by being inserted into the locked groove. 10. The connection structure for a pressure detector according to claim 9, wherein said locking member is a substantially U-shaped pin. 11. The connection structure for a pressure detector according to claim 10, wherein said substantially U-shaped pin is made of a metal material having a spring property. 12. A retaining projection for holding the substantially U-shaped pin in the retaining hole insertion / extraction hole in the vicinity of the entrance side of the retaining tool insertion / extraction hole. The connection structure for a pressure detector according to claim 10. 13. An apparatus according to claim 10, wherein an entrance side of said stopper insertion hole is wider than a back side.
The connection structure for a pressure detector according to any one of the above. 14. The test fluid introducing member has a first region whose outer peripheral surface is circular and a second region whose outer peripheral surface is polygonal, and an end located on the second region side. The connection structure for a pressure detector according to any one of claims 6 to 13, wherein the connection structure is a test fluid introduction pipe in which the fitting concave portion is provided in a through hole that opens at a portion. 15. The test fluid introducing member has a first region whose outer peripheral surface is circular and a second region whose outer peripheral surface is polygonal, and an end located on the second region side. 14. The test fluid introducing pipe according to claim 6, wherein the fitting concave portion is provided in a through hole that opens at the portion, and a male screw groove is formed on an outer peripheral surface of the first region. A connection structure for the pressure detector according to any one of the preceding claims. 16. The fluid introducing member is a pipe connecting mechanism having a plurality of one-touch fittings, and the fitting recess is provided in the flow path opened by the pipe connecting mechanism. The connection structure for a pressure detector according to any one of claims 6 to 13, characterized in that: 17. The test fluid introducing pipe of the threadless type described in claim 14, the fluid introducing pipe of the threaded type described in claim 15, and the test fluid introducing pipe of claim 16. The connection structure of a pressure detector, wherein the pipe connection mechanism has the fitting recess of the same standard.