JP2005325998A - Fitting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fitting with a pressure sensor connection nut and a flared copper pipe connection nut preventive of cracking. <P>SOLUTION: The fitting 50 comprises a first fluid passage communicated with a second fluid passage Pp of a nut member having the second fluid passage Pp, a female screw portion and a first taper portion, a push rod 52 and a body 51. The body has a push rod storage space SPi, a communication passage Pi2, a second taper portion 53, and a male screw portion 54. The push rod storage space SPi stores the push rod in such a state that part of the push rod is protruded along a longitudinal direction X of the push rod. The communication passage Pi2 is a passage for communication with the first fluid passage. A seal structure forming part is provided at the end on a push rod protruded side X1 in the longitudinal direction X of the push rod to encircle the outer periphery of the push rod storage space SPi, and it abuts on the first taper portion to form a seal structure. The male screw portion 54 can be threaded to the female screw portion along the longitudinal direction X of the push rod. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a joint for connecting a pressure sensor, a flare copper pipe, and the like to another pipe.

A member called a joint is often used to connect a pressure sensor, a flare copper pipe, and the like to other piping. By the way, among such joints, what seals a connection part by deforming metal packings, such as a copper packing, is widely known among those skilled in the art (for example, refer patent document 1).
A typical example of such a joint is shown in FIG. As shown in FIG. 1A, the joint 10 includes a push rod 12, a main body 11, a steel ball 15, a spring 16, a copper packing 13, and a copper pipe portion 17.

  The push rod 12 includes a contact portion 12a, a first flow path Pc11, and a second flow path Pc12. The contact portion 12a is provided at one end portion in the push rod longitudinal direction X. The contact portion 12a is provided with a contact taper portion 12b. As is apparent from FIG. 1A, the contact taper portion 12b surrounds the first flow path Pc11 at the end of the contact portion 12a on the push rod longitudinal side X1 in the push rod longitudinal direction X. Is provided. Moreover, this contact taper part 12b inclines toward the opposite side X2 of the push rod protrusion side of the push rod longitudinal direction X toward the outer periphery. And this taper part 12b is a state where the push rod 12 is housed in a push rod housing space SPc of the main body 11 which will be described later, and the female thread portion 22 of the pressure sensor connecting nut 20 shown in FIG. Are brought into contact with the nut taper portion 21 of the pressure sensor connecting nut 20 (see FIG. 1B and FIG. 1C). Further, the push rod 12 is in contact with the steel ball 15 at the end X2 opposite to the push rod protruding side in the push rod longitudinal direction X. The push rod 12 is urged by the spring 16 together with the steel ball 15 toward the push rod protruding side X1 in the push rod longitudinal direction X. That is, when an external force is applied from the opposite side X2 of the push rod protruding side in the push rod longitudinal direction X, the push rod 12 moves along the push rod longitudinal direction X toward the opposite side X2 of the push rod protruding side. It is possible. The first flow path Pc11 is formed along the push rod longitudinal direction X. The second flow path Pc12 is formed along a direction perpendicular to the push rod longitudinal direction X. In addition, the 1st flow path Pc11 and the 2nd flow path Pc12 are connected, and form the 1st relay path Pc1.

  The main body 11 includes a push rod accommodating space SPc, a male screw portion 14, and a second relay path Pc2. In the push rod accommodating space SPc, the abutting portion 12a of the push rod 12 is accommodated so as to protrude to the outside. The push rod accommodating space SPc communicates with the first relay path Pc1 in a state where the push rod 12 is accommodated as such. The male screw portion 14 is provided so as to surround the outer periphery of the push rod accommodating space SPc. And this male thread part 14 can be screwed together with the female thread part 22 of the pressure sensor connection nut 20 along the push rod longitudinal direction X (refer FIG.1 (b)). A fluid flowing from a fluid passage of a copper pipe (not shown) to be connected flows through the second relay path Pc2.

The steel balls 15 are arranged in the second relay path Pc2 and are energized by the spring 16 to close the push rod accommodating space SPc and the second relay path Pc2.
The spring 16 is arranged in the second relay path Pc2 similarly to the steel ball 15, and biases the push rod 12 and the steel ball 15 as described above.
The copper packing 13 is disposed in a space sandwiched between the surface of the contact portion 12a on the opposite side X2 of the push rod protruding side in the longitudinal direction X of the push rod and the surface of the push rod protruding side X1 of the main body 11 in the longitudinal direction of the push rod. Is done.

The copper pipe portion 17 has a third relay path Pc3 and is connected to the lower end of the main body 11 by solder 18. Note that the lower end of the copper pipe portion 17 is previously brazed by brazing so that the flow path of the copper pipe (not shown) to be connected and the third relay path Pc3 of the copper pipe portion 17 communicate with each other. (Not shown).
When the male screw portion 14 of the joint 10 and the female screw portion 22 of the pressure sensor connection nut 20 are screwed together, first, the contact taper portion 12b comes into contact with the nut taper portion 21 of the pressure sensor connection nut 20 and is pushed. The rod 12 and the steel ball 15 begin to move to the opposite side X2 of the push rod protruding side in the push rod longitudinal direction X against the spring force of the spring 16. As a result, the flow path Pp of the pressure sensor connecting nut 20 and the first relay path Pc1 of the push rod 12 communicate with each other, and the push rod housing space SPc and the second relay path Pc2 communicate with each other (see FIG. 1C). . Then, when the screwing is further advanced, the copper packing 13 is brought into contact with the push rod protruding side X1 in the longitudinal direction X of the push rod in the longitudinal direction X of the main body 11 and the surface X2 opposite to the push rod protruding side in the push rod longitudinal direction X of the contact portion 12a. The surface is pressed and deformed to seal the gap between the contact portion 12a and the main body 11. In this state, the contact taper portion 12b and the nut taper portion 21 of the pressure sensor connection nut 20 are sufficiently crimped, and the contact portion 12a and the pressure sensor connection nut 20 are sufficiently sealed.

  In addition, the joint 10 is connected to the flare copper pipe connection nut 40 shown in FIG. 1 (e) to connect the flare copper pipe 30 shown in FIG. 1 (d) and another copper pipe (not shown). It is also possible to connect. The connection between the second relay path Pc2 of the joint 10 and the fluid passage of another copper pipe (not shown) is performed by brazing as in the case of the pressure sensor connection nut 20. In addition, in order to connect the flare copper pipe 30 to the joint 10, the flare copper pipe 30 is inserted into the opening HL of the flare copper pipe connection nut 40 in a manner as shown in FIG. In FIG. 1 (f), it appears that the flare portion 31 of the flare copper tube 30 and the nut taper portion 41 of the flare copper tube connection nut 40 are in close contact, but in this state, the flare portion of the flare copper tube 30. 31 and the nut taper portion 41 of the flare copper pipe connection nut 40 do not necessarily have to be in close contact with each other.

When the male thread portion 14 of the joint 10 and the female thread portion 42 of the flare copper pipe connection nut 40 are screwed together, first, the contact taper portion 12b comes into contact with the flare portion 31 of the flare copper pipe 30 and is pushed. The rod 12 and the steel ball 15 begin to move to the opposite side X2 of the push rod protruding side in the push rod longitudinal direction X against the spring force of the spring 16. As a result, the flow path Pf of the flare copper tube 30 communicates with the first relay path Pc1 of the push rod 12, and also communicates with the push rod accommodating space SPc and the second relay path Pc2 (see FIG. 1 (g)). Then, when the screwing is further advanced, the copper packing 13 is brought into contact with the push rod protruding side X1 in the longitudinal direction X of the push rod in the longitudinal direction X of the main body 11 and the surface X2 opposite to the push rod protruding side in the push rod longitudinal direction X of the contact portion 12a. The surface is pressed and deformed to seal the gap between the contact portion 12a and the main body 11. In this state, the flare portion 31 of the flare copper tube 30 is sufficiently clamped by the contact taper portion 12b and the nut taper portion 41 of the flare copper tube connection nut 40, and the flare portion 31, the contact portion 12a, And the flare copper pipe connection nut 40 is sufficiently sealed.
JP 2002-276866 A

  However, the angles β and γ formed by the inclination directions Sp and Sf of the nut taper portions 21 and 41 of the pressure sensor connection nut 20 and the flare copper tube connection nut 40 and the push rod longitudinal direction X are the inclination directions Sc1 of the contact taper portion 12b. When the screw packing is advanced until the copper packing 13 is deformed when it is smaller than the angle α formed with the longitudinal direction X of the push rod, the pressure sensor connecting nut 20 and the flare copper tube connecting nut 40 are deformed. There was a problem that the sensor connection nut 20 and the flare copper pipe connection nut 40 were broken (see FIGS. 1A, 1B, and 1E).

  The subject of this invention is providing the coupling which can prevent that a pressure sensor connection nut, a flare copper pipe connection nut, etc. crack.

  A joint according to a first aspect is a joint for communicating a first fluid passage with a second fluid passage of a nut member having a second fluid passage, a female thread portion, and a first taper portion, and a push rod and a main body Is provided. Note that fluid passes through the first fluid passage. Further, the first taper portion is inclined toward the female screw portion side toward the outer peripheral side. The main body has a push rod accommodating space, a communication path, a seal structure forming portion, and a male screw portion. The push rod accommodating space accommodates the push rod so that a part of the push rod projects along the longitudinal direction of the push rod. The communication passage is a passage for communicating with the first fluid passage. In addition, this communicating path is provided in the opposite side to the push rod protrusion side of the push rod longitudinal direction of a push rod accommodation space. The seal structure forming portion is provided at the end on the push rod protruding side in the push rod longitudinal direction so as to surround the outer periphery of the push rod housing space. And this seal structure formation part can contact | abut with a 1st taper part, and can form a seal structure. The male screw portion can be screwed with the female screw portion along the longitudinal direction of the push rod. When the female screw portion and the male screw portion are screwed together, the seal structure forming portion abuts on the first taper portion. The push rod moves to the opposite side of the push rod projecting side along the longitudinal direction of the push rod, with a part of the portion projecting from the push rod housing space coming into contact with a part of the nut member. And the communication passage.

  Here, when the female screw portion and the male screw portion are screwed together, the seal structure forming portion abuts on the first taper portion. Therefore, in this joint, the seal between the main body and the nut member is sealed by the seal structure forming portion of the main body and the first taper portion of the nut member without proceeding the screwing until the copper packing is deformed as in the conventional joint. It can be carried out. Therefore, in this joint, the main body and the nut member can be sealed with a small tightening torque. As a result, this joint can prevent the nut member from cracking. Further, in this joint, as in the conventional joint, a part of the portion where the push rod protrudes from the push rod housing space comes into contact with a part of the nut member and the push rod protrudes along the push rod longitudinal direction. It moves to the opposite side and makes the 2nd fluid passage and the communicating passage communicate. For this reason, even in this joint, if the communication passage and the first fluid passage are communicated by a technique such as brazing before the female screw portion and the male screw portion are screwed together, as in the conventional joint, The fluid flowing in the fluid passage can be passed through another fluid passage.

The joint according to the second invention is the joint according to the first invention, and the seal structure forming portion is the second taper portion. A 2nd taper part inclines toward the opposite side to the push rod protrusion side of a push rod longitudinal direction as it goes to an outer peripheral side.
Here, the seal structure forming portion is the second tapered portion. For this reason, in this joint, a seal structure can be formed by surface contact with the first tapered portion. Therefore, this joint can form a good seal structure.

The joint according to the third invention is the joint according to the second invention, wherein the angle formed by the inclination direction of the second taper portion with the longitudinal direction of the push rod is the first in the state where the female screw portion and the male screw portion are screwed together. The inclination direction of the taper portion is equal to or smaller than the angle formed by the longitudinal direction of the push rod.
Here, the angle formed by the inclination direction of the second taper portion with the longitudinal direction of the push rod is equal to or less than the angle formed by the inclination direction of the first taper portion with the longitudinal direction of the push rod in a state where the female screw portion and the male screw portion are screwed together. is there. For this reason, in this joint, when the female screw portion and the male screw portion are screwed together, the entire surface of the second taper portion contacts the entire surface of the first taper portion or the push rod in the longitudinal direction of the push rod of the second taper portion. The protruding side can contact the push rod protruding side of the first taper portion in the longitudinal direction of the push rod. Therefore, in this joint, the sealing state between the main body and the nut member can be improved.

The joint according to the fourth invention is the joint according to the second invention or the third invention, wherein the second taper portion is provided with a first protrusion. The first protrusion protrudes toward the outer peripheral side. The first projecting portion is in contact with the first tapered portion and deforms to form a seal structure.
Here, a 1st projection part is provided in a 2nd taper part. The first projecting portion is in contact with the first tapered portion and deforms to form a seal structure. For this reason, in this joint, it becomes possible to form a strong seal structure.

A joint according to a fifth aspect is the joint according to the first aspect, wherein the seal structure forming part is a convex spherical part.
Here, the seal structure forming portion is a convex spherical portion. For this reason, in this joint, regardless of the angle of the first taper portion, it is possible to form a seal structure in line contact with any portion of the first taper portion.

A joint according to a sixth aspect of the present invention is the joint according to any one of the first to fifth aspects of the present invention, and the seal structure forming portion includes a seal member as a separate body. And this seal member forms a seal structure by contacting and deforming the 1st taper part.
Here, the seal member is included separately in the seal structure forming portion. And this seal member forms a seal structure by contacting and deforming the 1st taper part. For this reason, in this joint, it becomes possible to form a strong seal structure. In this joint, the seal member can be appropriately replaced. Therefore, in this joint, the reliability with respect to the seal at the time of a plurality of times of tightening can be improved.

A joint according to a seventh aspect is the joint according to the sixth aspect, wherein the seal structure forming portion further includes a groove for supporting the seal member.
Here, the seal structure forming portion further includes a groove for supporting the seal member. For this reason, in this joint, there is no possibility that the seal member is displaced, and a good seal structure can be formed.

  A joint according to an eighth aspect is the joint according to any one of the first through seventh aspects, wherein the push rod has a second protrusion at a portion protruding from the push rod housing space. The second protrusion protrudes on the outer peripheral side of the push rod. The second protrusion is preferably wider than the maximum passage width of the second fluid passage. Then, when the female screw part and the male screw part are screwed together, the second projection part comes into contact with the first taper part, and the push bar moves to the opposite side of the push bar protruding side along the push bar longitudinal direction, The second fluid passage and the communication passage are communicated.

  Here, the push rod has a second protrusion at a portion protruding from the push rod housing space. Then, when the female screw part and the male screw part are screwed together, the second projection part comes into contact with the first taper part, and the push bar moves to the opposite side of the push bar protruding side along the push bar longitudinal direction, The second fluid passage and the communication passage are communicated. For this reason, in this joint, the cross section of the push rod cut by the plane perpendicular to the longitudinal direction of the push rod is a plane perpendicular to the longitudinal direction of the push rod of the second fluid passage when the female screw portion and the male screw portion are screwed together. Even if it is completely surrounded by a cross-section cut by, it can be connected.

  The joint according to the ninth aspect is the joint according to the eighth aspect, wherein the second protrusion has a third tapered portion. A 3rd taper part inclines toward the opposite side to the push rod protrusion side of a push rod longitudinal direction as it goes to an outer peripheral side. When the female screw part and the male screw part are screwed together, the third taper part comes into contact with the first taper part, and the push bar moves to the opposite side of the push bar protruding side along the push bar longitudinal direction, The second fluid passage and the communication passage are communicated.

  Here, the protrusion has a third taper portion. For this reason, in this joint, when the end of the push rod protruding side of the second protrusion in the longitudinal direction of the push rod comes into contact with the tapered portion of the nut member, the sealing state with the nut member can be made favorable. . Further, the angle formed by the inclination direction of the third taper portion with the longitudinal direction of the push rod is equal to or less than the angle formed by the inclination direction of the taper portion of the nut member with the longitudinal direction of the push rod in a state where the female screw portion and the male screw portion are screwed together. If so, the sealing state between the end portion and the nut member can be made better.

  A joint according to a tenth aspect of the present invention is the joint according to any one of the first to seventh aspects of the present invention, wherein the push rod has a fourth tapered portion. A 4th taper part is provided in the edge part of the push rod protrusion side of a push rod longitudinal direction. Moreover, this 4th taper part inclines toward the opposite side to the push rod protrusion side of a push rod longitudinal direction as it goes to an outer peripheral side. When the female screw portion and the male screw portion are screwed together, the fourth taper portion comes into contact with the first taper portion, and the push rod moves along the push rod longitudinal direction to the opposite side of the push rod protruding side, The second fluid passage and the communication passage are communicated.

  Here, a 4th taper part is provided in the edge part of the push rod protrusion side of a push rod longitudinal direction. For this reason, in this joint, when the end portion of the push rod in the push rod longitudinal direction on the push rod protruding side comes into contact with the tapered portion of the nut member, the sealing state between the end portion and the nut member is improved. be able to. Further, the angle formed by the inclination direction of the fourth taper portion with the longitudinal direction of the push rod is equal to or less than the angle formed by the inclination direction of the taper portion of the nut member with the longitudinal direction of the push rod in a state where the female screw portion and the male screw portion are screwed together. If so, the sealing state between the end portion and the nut member can be made better.

  A joint according to an eleventh aspect of the present invention is a joint for communicating a third fluid passage with a fourth fluid passage of a pipe having a fourth fluid passage and a fifth tapered portion, and a push rod, a main body, and a nut member Is provided. The fluid passes through the third fluid passage. A 5th taper part inclines toward an edge part as it goes to the radial direction of piping. The main body has a push rod accommodating space, a communication path, a seal structure forming portion, and a male screw portion. The push rod accommodating space accommodates the push rod so that a part of the push rod projects along the longitudinal direction of the push rod. The communication passage is a passage for communicating with the third fluid passage. In addition, this communicating path is provided in the opposite side to the push rod protrusion side of the push rod longitudinal direction of a push rod accommodation space. The seal structure forming portion is provided at the end on the push rod protruding side in the push rod longitudinal direction so as to surround the outer periphery of the push rod housing space. And this seal structure formation part can contact | abut with a 5th taper part, and can form a seal structure. The nut member has an internal thread portion, an opening, and a sixth taper portion. The female screw portion can be screwed with the male screw portion along the longitudinal direction of the push rod. The opening is provided for inserting a pipe. A 6th taper part inclines toward the internal thread part side as it goes to an outer peripheral side. Then, when the female screw part and the male screw part are screwed together with the pipe inserted into the opening so that the fifth taper part contacts the sixth taper part, the seal structure forming part and the sixth taper part are: A part of the fifth taper portion is clamped. Further, the end of the push rod projecting side comes into contact with the other portion of the fifth taper portion, and the push rod moves to the opposite side of the push rod projecting side along the longitudinal direction of the push rod and communicates with the fourth fluid passage. Communicate with the passage.

  Here, when the female screw part and the male screw part are screwed together with the pipe inserted into the opening so that the fifth taper part contacts the sixth taper part, the seal structure forming part and the sixth taper part are Then, a part of the fifth taper portion is clamped. For this reason, in this joint, the main body, the piping, and the nut member are connected by the seal structure forming portion of the main body and the sixth taper portion of the nut member without proceeding screwing until the copper packing is deformed as in the conventional joint. Sealing can be performed. Therefore, in this joint, the main body, the pipe, and the nut member can be sealed with a small tightening torque. As a result, this joint can prevent the nut member from cracking. In this joint, as in the conventional joint, the end of the push rod protrudes from the other end of the fifth taper portion, and the push rod protrudes in the longitudinal direction of the push rod. And the fourth fluid passage and the communication passage are communicated with each other. For this reason, even in this joint, if the communication passage and the third fluid passage are connected by a technique such as brazing before the female screw portion and the male screw portion are screwed together, The fluid flowing in the fluid passage can be passed through another fluid passage.

The joint according to the twelfth invention is the joint according to the eleventh invention, wherein the seal structure forming portion is a seventh taper portion. A 7th taper part inclines toward the opposite side to the push rod protrusion side of a push rod longitudinal direction as it goes to an outer peripheral side.
Here, the seal structure forming portion is the seventh tapered portion. For this reason, in this joint, a seal structure can be formed by surface contact with the fifth tapered portion. Therefore, this joint can form a good seal structure.

The joint according to the thirteenth invention is the joint according to the twelfth invention, wherein the angle formed by the inclination direction of the seventh taper portion with the longitudinal direction of the push rod is the sixth in the state where the female screw portion and the male screw portion are screwed together. The inclination direction of the tapered portion is equal to or smaller than the angle formed with the longitudinal direction of the push rod.
Here, the angle formed by the inclination direction of the seventh taper portion with the longitudinal direction of the push rod is equal to or less than the angle formed by the inclination direction of the sixth taper portion with the longitudinal direction of the push rod in a state where the female screw portion and the male screw portion are screwed together. is there. For this reason, in this joint, the fifth taper portion is sandwiched between the entire surface of the seventh taper portion and the entire surface of the sixth taper portion, or the push rod protruding side of the seventh taper portion in the longitudinal direction of the push rod and the sixth taper portion The fifth taper portion can be clamped by the push rod protruding side in the longitudinal direction of the push rod. Therefore, in this joint, the sealing state with the main body, the piping, and the nut member can be improved.

The joint according to the fourteenth invention is the joint according to the twelfth invention or the thirteenth invention, and the third taper portion is provided with a third protrusion. The third protrusion protrudes toward the outer peripheral side. And the 3rd projection part contacts the 5th taper part, and forms a seal structure.
Here, the third taper is provided with a third protrusion. And the 3rd projection part contacts the 5th taper part, and forms a seal structure. For this reason, in this joint, it becomes possible to form a strong seal structure.

A joint according to the fifteenth aspect is the joint according to the eleventh aspect, wherein the seal structure forming part is a convex spherical part.
Here, the seal structure forming portion is a convex spherical portion. For this reason, in this joint, regardless of the angle of the first taper portion, it is possible to form a seal structure in line contact with any portion of the first taper portion.

The joint according to the sixteenth invention is a joint according to any of the eleventh to fifteenth inventions, and the seal structure forming portion includes a seal member as a separate body. And this seal member forms a seal structure by contacting and deforming the 5th taper part.
Here, the seal member is included separately in the seal structure forming portion. And this seal member forms a seal structure by contacting and deforming the 5th taper part. For this reason, in this joint, it becomes possible to form a strong seal structure. In this joint, the seal member can be appropriately replaced. Therefore, in this joint, the reliability with respect to the seal at the time of a plurality of times of tightening can be improved.

The joint according to the seventeenth aspect is the joint according to the sixteenth aspect, wherein the seal structure forming portion further includes a groove for supporting the seal member.
Here, the seal structure forming portion further includes a groove for supporting the seal member. For this reason, in this joint, there is no possibility that the seal member is displaced, and a good seal structure can be formed.

  A joint according to an eighteenth aspect of the present invention is the joint according to any of the eleventh to seventeenth aspects of the present invention, wherein the push rod has a fourth protrusion at a portion protruding from the push rod housing space. The fourth protrusion protrudes on the outer peripheral side of the push rod. The fourth protrusion is preferably wider than the maximum passage width of the fourth fluid passage. And when a female screw part and a male screw part are screwed together in the state where piping was inserted in the opening so that the 5th taper part may contact the 6th taper part, the 4th projection part is the other part of the 5th taper part. The push rod moves to the opposite side of the push rod protruding side along the push rod longitudinal direction, and the fourth fluid passage and the communication passage are communicated with each other.

  Here, the push rod has a fourth protrusion at a portion protruding from the push rod housing space. Then, when the female screw part and the male screw part are screwed together, the fourth projection part comes into contact with the fifth taper part, and the push bar moves to the opposite side of the push bar protruding side along the push bar longitudinal direction, The fourth fluid passage and the communication passage are communicated. For this reason, in this joint, the cross section of the push rod cut by the plane perpendicular to the longitudinal direction of the push rod is a plane perpendicular to the longitudinal direction of the push rod of the fourth fluid passage in a state where the female screw portion and the male screw portion are screwed together. Even if it is completely surrounded by a cross-section cut by, it can be connected.

  The joint according to the nineteenth invention is the joint according to the eighteenth invention, wherein the fourth projecting portion has an eighth taper portion. The 8th taper part inclines toward the opposite side to the push rod protrusion side of a push rod longitudinal direction as it goes to the perimeter side. When the female screw portion and the male screw portion are screwed together with the pipe inserted into the opening so that the fifth taper portion contacts the sixth taper portion, the eighth taper portion is the other portion of the fifth taper portion. The push rod moves to the opposite side of the push rod protruding side along the push rod longitudinal direction, and the fourth fluid passage and the communication passage are communicated with each other.

  Here, the protrusion has an eighth taper portion. For this reason, in this joint, when the end of the fourth protruding portion on the push rod protruding side in the longitudinal direction of the push rod comes into contact with the tapered portion of the pipe, the sealing state with the pipe can be improved. Further, the angle formed by the inclination direction of the eighth taper portion with the longitudinal direction of the push rod is not more than the angle formed by the inclination direction of the tapered portion of the pipe with the longitudinal direction of the push rod in the state where the female screw portion and the male screw portion are screwed together. For example, the sealing state between the end portion and the piping can be made better.

  A joint according to a twentieth invention is the joint according to any of the eleventh to seventeenth inventions, wherein the push rod has a ninth taper portion. The ninth tapered portion is provided at the end of the push rod protruding side in the push rod longitudinal direction. Moreover, this 9th taper part inclines toward the opposite side to the push rod protrusion side of a push rod longitudinal direction as it goes to an outer peripheral side. When the female screw portion and the male screw portion are screwed together with the pipe inserted into the opening so that the fifth taper portion contacts the sixth taper portion, the ninth taper portion is the other portion of the fifth taper portion. The push rod moves to the opposite side of the push rod protruding side along the push rod longitudinal direction, and the fourth fluid passage and the communication passage are communicated with each other.

  Here, the 9th taper part is provided in the edge part of the push rod protrusion side of a push rod longitudinal direction. For this reason, in this joint, when the end of the push rod in the push rod longitudinal direction on the push rod protruding side comes into contact with the tapered portion of the pipe, the seal state between the end and the pipe can be improved. . Further, the angle formed by the inclination direction of the ninth taper portion with the longitudinal direction of the push rod is not more than the angle formed by the inclination direction of the taper portion of the pipe with the longitudinal direction of the push rod when the female thread portion and the male screw portion are screwed together. In this case, the sealing state between the end portion and the nut member or piping can be made better.

  In the joint according to the first invention, the main body and the nut member can be sealed with a small tightening torque. As a result, this joint can prevent the nut member from cracking. Further, in this joint, as in the conventional joint, a part of the portion where the push rod protrudes from the push rod housing space comes into contact with a part of the nut member and the push rod protrudes along the push rod longitudinal direction. It moves to the opposite side and makes the 2nd fluid passage and the communicating passage communicate. For this reason, even in this joint, if the communication passage and the first fluid passage are communicated by a technique such as brazing before the female screw portion and the male screw portion are screwed together, as in the conventional joint, The fluid flowing in the fluid passage can be passed through another fluid passage.

In the joint according to the second invention, a seal structure can be formed by surface contact with the first taper portion. Therefore, this joint can form a good seal structure.
In the joint according to the third aspect of the invention, when the female thread portion and the male thread portion are screwed together, the entire surface of the second taper portion contacts the entire surface of the first taper portion or the second taper portion is pushed in the longitudinal direction of the push rod. The rod protrusion side can contact the push rod protrusion side of the first taper portion in the longitudinal direction of the push rod. Therefore, in this joint, the sealing state between the main body and the nut member can be improved.

In the joint according to the fourth invention, it is possible to form a strong seal structure.
In the joint according to the fifth aspect, regardless of the angle of the first taper portion, it is possible to form a seal structure in line contact with any portion of the first taper portion.
In the joint according to the sixth invention, it is possible to form a strong seal structure. In this joint, the seal member can be appropriately replaced. Therefore, in this joint, the reliability with respect to the seal at the time of a plurality of times of tightening can be improved.

In the joint according to the seventh aspect of the invention, there is no fear that the seal member is displaced, and a good seal structure can be formed.
In the joint according to the eighth aspect of the present invention, the cross section of the push rod cut by the plane perpendicular to the longitudinal direction of the push rod is perpendicular to the longitudinal direction of the push rod of the second fluid passage when the female screw portion and the male screw portion are screwed together. Even if it is completely surrounded by a section cut by a plane, it can be connected.

  In the joint according to the ninth aspect of the present invention, when the end of the second protrusion in the push rod longitudinal direction on the push rod protruding side comes into contact with the taper portion of the nut member, the sealing state with the nut member may be good. it can. Further, the angle formed by the inclination direction of the third taper portion with the longitudinal direction of the push rod is equal to or less than the angle formed by the inclination direction of the taper portion of the nut member with the longitudinal direction of the push rod in a state where the female screw portion and the male screw portion are screwed together. If so, the sealing state between the end portion and the nut member can be made better.

  In the joint according to the tenth aspect of the invention, when the end of the push rod in the longitudinal direction of the push rod comes into contact with the tapered portion of the nut member, the seal state between the end and the nut member is good. can do. Further, the angle formed by the inclination direction of the fourth taper portion with the longitudinal direction of the push rod is equal to or less than the angle formed by the inclination direction of the taper portion of the nut member with the longitudinal direction of the push rod in a state where the female screw portion and the male screw portion are screwed together. If so, the sealing state between the end portion and the nut member can be made better.

  In the joint according to the eleventh invention, the main body, the pipe, and the nut member are formed by the seal structure forming portion of the main body and the sixth taper portion of the nut member without proceeding screwing until the copper packing is deformed as in the conventional joint. Can be sealed. Therefore, in this joint, the main body, the pipe, and the nut member can be sealed with a small tightening torque. As a result, this joint can prevent the nut member from cracking. In this joint, as in the conventional joint, the end of the push rod protrudes from the other end of the fifth taper portion, and the push rod protrudes in the longitudinal direction of the push rod. And the fourth fluid passage and the communication passage are communicated with each other. For this reason, even in this joint, if the communication passage and the third fluid passage are connected by a technique such as brazing before the female screw portion and the male screw portion are screwed together, The fluid flowing in the fluid passage can be passed through another fluid passage.

In the joint according to the twelfth aspect, a seal structure can be formed by surface contact with the fifth tapered portion. Therefore, this joint can form a good seal structure.
In the joint according to the thirteenth aspect of the present invention, the fifth taper portion is clamped by the entire surface of the seventh taper portion and the entire surface of the sixth taper portion, or the push rod protruding side in the push rod longitudinal direction of the seventh taper portion and the sixth taper portion The fifth taper portion can be clamped by the push rod protruding side of the portion in the longitudinal direction of the push rod. Therefore, in this joint, the sealing state with the main body, the piping, and the nut member can be improved.

In the joint according to the fourteenth aspect, a strong seal structure can be formed.
In the joint according to the fifteenth aspect, regardless of the angle of the first taper portion, it is possible to form a seal structure in line contact with any part of the first taper portion.
In the joint according to the sixteenth aspect, a strong seal structure can be formed. In this joint, the seal member can be appropriately replaced. Therefore, in this joint, the reliability with respect to the seal at the time of a plurality of times of tightening can be improved.

In the joint according to the seventeenth invention, there is no fear that the seal member is displaced, and a good seal structure can be formed.
In the joint according to the eighteenth aspect of the present invention, the cross section of the push rod cut by the plane perpendicular to the longitudinal direction of the push rod is perpendicular to the longitudinal direction of the push rod of the fourth fluid passage when the female screw portion and the male screw portion are screwed together. Even if it is completely surrounded by a section cut by a plane, it can be connected.

  In the joint according to the nineteenth aspect of the present invention, when the end of the fourth protrusion on the push rod protruding side in the longitudinal direction of the push rod comes into contact with the tapered portion of the pipe, the sealing state with the pipe can be made favorable. Further, the angle formed by the inclination direction of the eighth taper portion with the longitudinal direction of the push rod is not more than the angle formed by the inclination direction of the tapered portion of the pipe with the longitudinal direction of the push rod in the state where the female screw portion and the male screw portion are screwed together. For example, the sealing state between the end portion and the piping can be made better.

  In the joint according to the twentieth invention, when the end of the push rod in the longitudinal direction of the push rod comes into contact with the tapered portion of the pipe, the seal state between the end and the pipe may be made favorable. it can. Further, the angle formed by the inclination direction of the ninth taper portion with the longitudinal direction of the push rod is not more than the angle formed by the inclination direction of the taper portion of the pipe with the longitudinal direction of the push rod when the female thread portion and the male screw portion are screwed together. In this case, the sealing state between the end portion and the nut member or piping can be made better.

[Fitting structure]
A longitudinal sectional view of the joint according to the present invention is shown in FIG.
As shown in FIG. 2A, the joint 50 includes a push rod 52, a main body 51, a steel ball 55, a spring 56, and a copper pipe portion 57.
[Components of fittings]
(1) Push rod Push rod 52 is provided with projection part 52a, the 1st channel Pi11, and the 2nd channel Pi12. The protrusion 52a is provided on the outer periphery of the push rod 52 and has a protrusion taper 52b. In addition, this protrusion taper part 52b inclines toward the opposite side X2 of the push rod protrusion side of the push rod longitudinal direction X toward the outer peripheral side. In the protrusion taper portion 52b, the angle formed by the inclination direction of the protrusion taper portion 52b with the push rod longitudinal direction X is equal to or less than the angle formed by the inclination direction of the main body taper portion 53 (described later) with the push rod longitudinal direction X. It is formed so that it may become more than the angle. Further, the end of the push bar 52 opposite to the push bar protruding side in the push bar longitudinal direction X is a steel ball 55 in a state where the push bar 52 is housed in a push bar housing space SPi (described later) of the main body 51. To touch. At this time, the push rod 52 is urged toward the push rod protruding side X1 in the push rod longitudinal direction X by the spring 56 together with the steel balls 55. That is, when an external force is applied from the opposite side X2 of the push rod protruding side in the push rod longitudinal direction X, the push rod 52 moves along the push rod longitudinal direction X toward the opposite side X2 of the push rod protruding side. It is possible. The first flow path Pi11 is formed along the push rod longitudinal direction X. The second flow path Pi12 is formed along a direction perpendicular to the push rod longitudinal direction X. Note that the first flow path Pi11 and the second flow path Pi12 communicate with each other and form a first relay path Pi1.

(2) Main body The main body 51 includes a push rod housing space SPi, a male screw portion 54, a main body taper portion 53, and a second relay path Pi2. In the push rod accommodating space SPi, a part of the push rod 52 including the protrusion 52a is accommodated so as to protrude to the outside. The push rod accommodating space SPi communicates with the first relay path Pi1 in a state where the push rod 52 is accommodated as such. The male screw portion 54 is provided on the opposite side X2 of the main body taper portion 53 on the push rod protruding side in the push rod longitudinal direction X so as to surround the outer periphery of the push rod housing space. And this male thread part 54 can be screwed together with the female thread part 22 of the pressure sensor connection nut 20 along the push rod longitudinal direction X (refer FIG.1 (b)). The main body taper portion 53 is provided at the end of the push rod protruding side X1 in the push rod longitudinal direction X so as to surround the outer periphery of the push rod housing space SPi, and the push rod projecting side in the push rod longitudinal direction X toward the outer circumference side. It inclines toward the opposite side X2. The main body taper portion 53 has an angle δ formed by the inclination direction Si1 and the longitudinal direction X of the push rod. The internal thread portion 22 and the external thread portion 54 of the pressure sensor connecting nut 20 are screwed along the longitudinal direction X of the push rod. In this state, the inclined direction Sp of the nut taper portion 20 is formed to be not more than an angle β formed with the longitudinal direction X of the push rod and not less than a predetermined angle. The joint 50 connects the flare copper pipe 30 shown in FIG. 1 (d) and another copper pipe (not shown) in cooperation with the flare copper pipe connecting nut 40 shown in FIG. 1 (e). In this case, the main body taper portion 53 of the nut taper portion 41 is in a state where the angle δ formed by the inclination direction Si1 with the push rod longitudinal direction X is screwed with the female screw portion 42 and the male screw portion 54 along the push rod longitudinal direction X. It is formed so that the inclination direction Sf is equal to or smaller than an angle γ formed with the longitudinal direction X of the push rod and equal to or larger than a predetermined angle. A fluid flowing from a fluid passage of a copper pipe (not shown) to be connected flows through the second relay path Pi2.

(3) Steel ball The steel ball 55 is arrange | positioned at the 2nd relay path Pi2, and is obstruct | occluded by the spring 56, and obstruct | occludes the push rod accommodation space SPi and the 2nd relay path Pi2.
(4) Spring The spring 56 is arrange | positioned at the 2nd relay path Pi2 similarly to the steel ball 55, and biases the push rod 52 and the steel ball 55 as mentioned above.

(5) Copper tube portion The copper tube portion 57 has a third relay path Pi3 and is connected to the lower end of the main body 51 by solder 58. The lower end of the copper pipe portion 57 is previously brazed with copper pipe (not shown) so that the flow path of the copper pipe (not shown) to be connected and the third relay path Pi3 of the copper pipe portion 57 communicate with each other. Connected).

[Connection form of joint and pressure sensor connection nut]
When the male screw portion 14 of the joint 10 and the female screw portion 22 of the pressure sensor connection nut 20 are screwed together, first, the end of the push rod protruding side X1 in the push rod longitudinal direction X of the push rod 52 is the pressure sensor connection nut. The push rod 52 and the steel ball 55 abut against the flat portion formed on the opposite side X2 of the push rod longitudinal direction X in the push rod longitudinal direction X of the flow path Pp, and the push rod longitudinal direction X against the spring force of the spring 56 Begins to move to the opposite side X2 of the push bar protruding side. As a result, the flow path Pp of the pressure sensor connecting nut 20 and the first relay path Pi1 of the push rod 52 communicate with each other, and the push rod accommodating space SPi and the second relay path Pi2 also communicate with each other (see FIG. 2B). . When the screwing is further advanced, the entire surface of the main body taper portion 53 comes into contact with the entire surface of the net taper portion 21, or the push rod protruding side X1 of the main body taper portion 53 in the longitudinal direction of the push rod X It contacts the push rod protruding side X1 in the longitudinal direction of the push rod. In this state, the end of the push rod 52 in the longitudinal direction X of the push rod 52 and the opposite end X2 of the push rod longitudinal direction X of the flow passage Pp of the pressure sensor connecting nut 20 are located on the opposite side X2. The formed flat portion is sufficiently urged and sealed by the spring force of the spring 56. Similarly, the main body 51 and the pressure sensor connecting nut 20 are sufficiently sealed by the main body tapered portion 53 and the nut tapered portion 21.

[Connection form between joint and flare copper pipe connection nut]
The joint 50 is connected to the flare copper pipe connection nut 40 shown in FIG. 1 (e) to connect the flare copper pipe 30 shown in FIG. 1 (d) and another copper pipe (not shown). It is also possible to connect. The connection between the joint 50 and another copper pipe (not shown) is performed by brazing as in the case of the pressure sensor connection nut 20. Further, in order to connect the flare copper pipe 30 to the joint 50, the flare copper pipe 30 is inserted into the opening HL of the flare copper pipe connection nut 40 in a manner as shown in FIG. In FIG. 1 (f), it appears that the flare portion 31 of the flare copper tube 30 and the nut taper portion 41 of the flare copper tube connection nut 40 are in close contact, but in this state, the flare portion of the flare copper tube 30. 31 and the nut taper portion 41 of the flare copper pipe connection nut 40 do not necessarily have to be in close contact with each other.

  When the male thread portion 54 of the joint 50 and the female thread portion 42 of the flare copper pipe connection nut 40 are screwed together along the longitudinal direction X of the push rod, first, the projecting taper portion 52b of the push rod 52 is flare copper. The push rod 52 and the steel ball 55 come into contact with the flare portion 31 of the tube 30 and begin to move to the opposite side X2 of the push rod protruding side in the push rod longitudinal direction X against the spring force of the spring 56. As a result, the flow path Pf of the flare copper tube 30 and the first relay path Pi1 of the push rod 12 communicate with each other, and the push rod accommodation space SPi and the second relay path Pi2 also communicate with each other (see FIG. 2C). When the screwing is further advanced, the flare 31 is pressed between the entire surface of the main body taper 53 and the entire surface of the nut taper 41, or the flare 31 is pushed in the longitudinal direction X of the push rod of the main body taper 53. It is pinched by the rod protrusion side X1 and the push rod protrusion side X1 of the flare portion 31 in the longitudinal direction of the push rod. In this state, the protrusion taper portion 52b and the flare portion 31 are sufficiently urged by the spring force of the spring 56 and sealed. Similarly, when the flare 31 is clamped between the main body 51 and the nut taper 41, the flare 31, the main body 51, and the flare copper pipe connection nut 40 are sufficiently sealed.

[Features of fittings]
(1)
In the joint 50 according to the present embodiment, when the male screw portion 54 and the female screw portion 22 are screwed together, the main body taper portion 53 contacts the nut taper portion 21. For this reason, in this joint 50, the main body 51 and the pressure sensor connecting nut 20 are sealed by the main body taper portion 53 and the nut taper portion 21 without proceeding screwing until the copper packing is deformed as in the conventional joint. be able to. Therefore, in this joint 50, the main body 51 and the pressure sensor connection nut 20 can be sealed with a small tightening torque. As a result, the joint 50 can prevent the pressure sensor connecting nut 20 from cracking. Further, in this joint 50, as in the conventional joint, the push rod 52 is opposite to the push rod projecting side in the longitudinal direction X of the push rod in the flow path Pp of the pressure sensor connecting nut 20 at the end of the push rod projecting side X1. It abuts against the flat surface formed on the side X2 and moves along the push rod longitudinal direction X to the opposite side X2 of the push rod protruding side. At the same time, the end of the push rod 52 on the opposite side X2 of the push rod comes into contact with the steel ball 55 and moves the steel ball 55 to the opposite side X2 on the push rod protruding side. For this reason, also in this joint 50, the fluid which flows into one fluid path can be made to flow into another fluid path like the conventional joint.

(2)
In the joint 50 according to the present embodiment, the angle δ between the inclination direction Si1 of the main body taper portion 53 and the push rod longitudinal direction X is such that the female screw portion 22 and the male screw portion 54 are screwed together along the push rod longitudinal direction X. In this state, the main body taper portion 53 is formed such that the inclination direction Sp of the nut taper portion 21 is equal to or less than an angle β formed with the push rod longitudinal direction X and equal to or greater than a predetermined angle. Therefore, when the female screw portion 22 and the male screw portion 54 are screwed together in the push rod longitudinal direction X, the entire surface of the main body taper portion 53 contacts the entire surface of the nut taper portion 21 or the push rod of the main body taper portion 53. The push rod protrusion side X1 in the longitudinal direction X can contact the push rod protrusion side X1 of the nut taper portion 21 in the push rod longitudinal direction X. Therefore, in this joint 50, the sealing state between the main body 51 and the pressure sensor connecting nut 20 can be made favorable.

(3)
In the joint 50 according to the present embodiment, the female screw portion 42 and the male screw portion 54 are in the push rod longitudinal direction X in a state where the flare copper tube 30 is inserted into the opening HL so that the flare portion 31 contacts the nut taper portion 41. When screwed along, the main body taper portion 53 and the nut taper portion 41 pinch the flare portion 31. Therefore, in this joint 50, the main body 51, the flare copper pipe 30, and the flare copper pipe are connected by the main body taper portion 53 and the nut taper portion 41 without proceeding screwing until the copper packing is deformed as in the conventional joint. The nut 40 can be sealed. Therefore, this joint 50 can seal the main body 51, the flare copper pipe 30, and the flare copper pipe connection nut 40 with a small tightening torque. As a result, this joint 50 can prevent the flare copper pipe connection nut 40 from cracking. Further, in this joint 50, as in the conventional joint, the push rod 52 has an end on the push rod protruding side abutting against the flare 31 and the opposite side X2 on the push rod protruding side along the push rod longitudinal direction X. Move to. At the same time, the end of the push rod 52 on the opposite side X2 of the push rod comes into contact with the steel ball 55 and moves the steel ball 55 to the opposite side X2 on the push rod protruding side. For this reason, also in this joint 50, the fluid which flows into one fluid path can be made to flow into another fluid path like the conventional joint.

(4)
In the joint 50 according to the present embodiment, the angle δ between the inclination direction Si1 of the main body taper portion 53 and the push rod longitudinal direction X is such that the female screw portion 42 and the male screw portion 54 are screwed together along the push rod longitudinal direction X. The main body taper portion 53 is formed so that the inclination direction Sf of the nut taper portion 41 is equal to or less than an angle γ formed with the longitudinal direction X of the push rod in a state where the nut taper portion 41 is in a predetermined angle. For this reason, when the female screw portion 42 and the male screw portion 54 are screwed together along the push rod longitudinal direction X, the flare portion 31 is clamped by the entire surface of the main body taper portion 53 and the entire surface of the nut taper portion 41, or the main body taper portion. The flare portion 31 can be clamped by the push rod protrusion side X1 of the push rod longitudinal direction 53 of the push rod 53 and the push rod protrusion side X1 of the nut taper portion 41 of the push rod longitudinal direction X. Therefore, in this joint 50, the sealing state with the main body 51, the flare copper pipe 30, and the flare copper pipe connection nut 40 can be made favorable.

(5)
In the joint 50 according to the present embodiment, the push rod 52 has a protrusion 52a at a portion protruding from the push rod housing space SPi. For this reason, in this joint 50, even if the radius of the push bar 52 is smaller than the radius of the flow path of the flare copper tube 30, as shown in FIG. It is possible to contact 30 flare portions 31. Therefore, in this joint 50, even in the above case, the push rod 52 can be moved to the opposite side X <b> 2 of the push rod protruding side in the push rod longitudinal direction X. As a result, in this joint 50, even in the above case, the fluid flowing in one fluid passage can be passed to the other fluid passage as in the conventional joint. Further, the projection 52a has a projection taper portion 52b. For this reason, in this joint 50, a sealing state with a nut member, piping, etc. can be made favorable.

(6)
In the joint 50 according to the present embodiment, the angle formed by the inclined direction of the protrusion taper portion 52b with the longitudinal direction of the push rod is such that the flare portion 31 of the flare copper tube 30 is in a state where the female screw portion 42 and the male screw portion 54 are screwed together. The protrusion taper portion 52b is formed so that the inclination direction is equal to or less than an angle formed with the push rod longitudinal direction X and equal to or more than a predetermined angle. For this reason, in this joint 50, the sealing state of the projection part 52a and the flare part 31 can be made more favorable.

[Modification]
(A)
In the joint 50 according to the previous embodiment, the push rod 52 whose end surface on the push rod protruding side in the push rod longitudinal direction X is flat is adopted, but the push rod longitudinal direction as shown in FIG. You may employ | adopt the push rod 62 in which the push rod taper part 62c is provided in the edge part of the push rod protrusion side of X. FIG. In such a joint 60, the joint 60 is connected to a pressure sensor connection nut 70 having a shape as shown in FIG. 3B or a flare copper pipe 80 having a small diameter as shown in FIG. Even in such a case, the sealing state between the push rod 62 and the pressure sensor connecting nut 70, the flare copper tube 80, etc. can be made good (see FIGS. 3C and 3E). . Further, the angle between the inclination direction of the push rod taper portion 62c and the push rod longitudinal direction X is such that the internal thread portions 72 and 92 of the pressure sensor connection nut 70 and the flare copper pipe connection nut 90 and the external thread portion 64 are in the push rod longitudinal direction X. In such a state, the inclination direction of the nut taper portion 71 of the pressure sensor connection nut 70 and the flare portion 81 of the flare copper tube 80 is not more than an angle formed with the longitudinal direction X of the push rod and is not less than a predetermined angle. If the push rod taper portion 62c is formed, the sealing state between the push rod 62 and the pressure sensor connecting nut 70, the flare copper tube 80, etc. can be made better.

(B)
In the joint 50 according to the previous embodiment, the angle δ between the inclination direction Si1 of the main body taper portion 53 and the push rod longitudinal direction X is such that the female screw portion 22 and the male screw portion 54 are screwed along the push rod longitudinal direction X. In this state, the main body taper portion 53 is formed so that the inclination direction Sp of the nut taper portion 21 is equal to or smaller than an angle β formed with the longitudinal direction X of the push rod and equal to or larger than a predetermined angle. However, the angle δ between the inclination direction Si1 of the main body taper portion 53 and the push rod longitudinal direction X is such that the nut taper portion 21 is inclined in a state where the female screw portion 22 and the male screw portion 54 are screwed together along the push rod longitudinal direction X. The main body taper portion 53 may be formed such that the direction Sp is equal to or larger than the angle β formed with the longitudinal direction X of the push rod.

(C)
In the joint 50 according to the previous embodiment, the angle δ between the inclination direction Si1 of the main body taper portion 53 and the push rod longitudinal direction X is such that the female screw portion 42 and the male screw portion 54 are threaded together along the push rod longitudinal direction X. In this state, the main body taper portion 53 is formed so that the inclination direction Sf of the nut taper portion 41 is equal to or smaller than an angle γ formed with the longitudinal direction X of the push rod and equal to or larger than a predetermined angle. However, the angle δ between the inclination direction Si1 of the main body taper portion 53 and the push rod longitudinal direction X is such that the nut taper portion 41 is inclined in a state where the female screw portion 42 and the male screw portion 54 are screwed together along the push rod longitudinal direction X. The main body taper portion 53 may be formed so that the direction Sf is equal to or larger than the angle γ formed with the push rod longitudinal direction X.

(D)
In the joint 50 according to the previous embodiment, the seal structure of the main body taper portion 53 and the net taper portion 21 or the flare portion 31 is formed by a taper surface. However, as shown in FIG. The metal seal ring 145 may be positioned between the portion 53 and the net taper portion 21 or the flare portion 31 to form a seal structure with the metal seal ring 145. Further, as shown in FIG. 4B, the metal seal ring 145 may be replaced with an O-ring 155. In this way, the metal seal ring 145 can be replaced as appropriate. Therefore, the reliability with respect to the seal at the time of tightening a plurality of times can be improved. Further, as shown in FIG. 4C, a housing groove 147 for the metal seal ring 145 or the O-ring 155 may be provided in the main body taper portion. In this way, there is no possibility that the metal seal ring 145 and the O-ring 155 are displaced, and a good seal structure can be formed.

(E)
In the joint 50 according to the previous embodiment, nothing was formed on the main body taper portion 53, but the protrusions 123a, 123d, as shown in FIG. 123b may be further provided. If it does in this way, the seal structure of a main body taper part and the net taper part 21 or the flare part 31 comes to be formed by protrusion part 123a, 123b. 4D, the outer peripheral surface is a ring surface centered on the push rod longitudinal direction X, and the inner peripheral surface is orthogonal to the push rod longitudinal direction X. It is in a substantially parallel relationship with the surface. Further, in the protrusion 123b shown in FIG. 4E, the outer peripheral surface is a ring surface centered on the push rod longitudinal direction X, and the inner peripheral surface is centered on the push rod longitudinal direction X. This is an inverted conical surface (with respect to the push rod protruding side X1 direction).

(F)
In the joint 50 according to the previous embodiment, the main body taper portion 53 is provided in the main body. However, the main body taper portion 53 may be a convex spherical surface portion 163 as shown in FIG. In this way, regardless of the angle of the nut taper portions 21 and 41, it becomes possible to form a seal structure by making line contact with any portion of the nut taper portions 21 and 41. Further, as shown in FIG. 4G, a metal seal ring 175 or an O-ring may be placed on the push rod protruding side X1 of the convex spherical portion 163. Furthermore, as shown in FIG. 4 (h), a metal seal ring 175 or an O-ring receiving groove 187 may be provided on the push rod protruding side X1 of the convex spherical surface portion. In this way, the seal structure is formed not only by the convex spherical surface portion 163 but also by the metal seal ring 175 and the O-ring. That is, a double seal structure can be formed.

(G)
In the joint according to the previous embodiment or the above-described modification, the tapered portion is provided at the push rod protrusion or the end portion of the push rod, but these may be formed into a convex spherical shape.
(H)
In the previous embodiment, the aspect in which the joint 50 is connected to the pressure sensor connecting nut 20 and the flare copper pipe 30 has been described. However, this joint can also be used for connecting a pressure switch, a safety valve, and the like. Can do.

  The joint according to the present invention can prevent the nut portion and nut of the pressure sensor from cracking, and is useful for configuring a refrigerant circuit such as an air conditioner.

The longitudinal cross-sectional view of the conventional coupling. The longitudinal cross-sectional view of a pressure sensor connection nut. The figure showing the screwing completion state of the conventional coupling and a pressure sensor connection nut. The fragmentary longitudinal cross-sectional view of a flare copper pipe. The longitudinal cross-sectional view of a flare copper pipe connection nut. The figure showing the state which inserted the flare copper pipe in the flare copper pipe connection nut. The figure showing the screwing completion state of the conventional coupling and a flare copper pipe connection nut. The longitudinal cross-sectional view of the coupling which concerns on this invention. The figure showing the screwing completion state of the joint which concerns on this invention, and a pressure sensor connection nut. The figure showing the screwing completion state of the joint which concerns on this invention, and a flare copper pipe connection nut. The longitudinal cross-sectional view of a part of the joint according to Modification (A). The longitudinal cross-sectional view of the pressure sensor connection nut which concerns on a modification (A). The figure showing the screwing completion state of the joint and pressure sensor connection nut concerning a modification (A). The longitudinal cross-sectional view of the flare copper pipe and flare copper pipe connection nut which concern on a modification (A). The figure showing the screwing completion state of the joint and flare copper pipe connection nut concerning a modification (A). The longitudinal cross-sectional view of a part of the joint according to Modification (D). The longitudinal cross-sectional view of a part of the joint according to Modification (D). The longitudinal cross-sectional view of a part of the joint according to Modification (D). The longitudinal cross-sectional view of a part of the joint according to Modification (E). The longitudinal cross-sectional view of a part of the joint according to Modification (E). The longitudinal cross-sectional view of a part of the joint according to Modification (F). The longitudinal cross-sectional view of a part of the joint according to Modification (F). The longitudinal cross-sectional view of a part of the joint according to Modification (F).

Explanation of symbols

20 Pressure sensor connection nut (nut member)
21 Nut taper (first taper)
22, 42 Female thread part 30 Flared copper pipe (pipe)
31 Flare part (first taper part)
40 Flared copper pipe connection nut (nut member)
41 Nut taper (third taper)
50, 60 Joint 51 Main body 52, 62 Push rod 52a Projection 52b Projection taper (fifth taper)
53 Tapered body (second taper)
54 Male thread 62c Push rod taper (fourth taper)
123a, 123b Protrusions 145, 175 Metal seal rings 147, 187 Housing groove 155 O-ring 163 Convex spherical surface portion Pp Pressure sensor connecting nut flow path (second fluid path)
Pf flare copper pipe flow path (second fluid passage)
Pi2 2nd junction (communication path)
SPi Push rod housing space HL Opening X Push rod longitudinal direction X1 Push rod protrusion side X2 Opposite to push rod protrusion side Sp Inclination direction of nut taper portion of pressure sensor connection nut (inclination direction of first taper portion)
Inclination direction of nut taper portion of Sf flare copper pipe connection nut (inclination direction of third taper portion)
Inclination direction of Si1 body taper portion (inclination direction of second taper portion)
β The angle formed by the inclination direction of the nut taper of the pressure sensor connecting nut and the longitudinal direction of the push rod (the angle formed by the inclination direction of the first taper portion and the longitudinal direction of the push rod)
Angle formed by the inclination direction of the nut taper portion of the γ flare copper pipe connection nut with the longitudinal direction of the push rod (angle formed by the inclination direction of the third taper portion with the longitudinal direction of the push rod)
δ Angle formed by the inclination direction of the main body taper portion with the longitudinal direction of the push rod (angle formed by the inclination direction of the second taper portion with the longitudinal direction of the push rod)

Claims (20)

A nut member having a first fluid passage through which a fluid passes, a second fluid passage (Pp), a female screw portion (22), and a first taper portion (21) that inclines toward the female screw portion side toward the outer peripheral side. A joint (50) for communicating with the second fluid passage (Pp) of (20),
A push rod (52);
A push rod housing space (SPi) for housing the push rod (52) so that a part of the push rod (52) protrudes along the push rod longitudinal direction (X), and the push rod housing space (SPi) A communication passage (Pi2) provided on the opposite side (X2) of the push rod in the longitudinal direction (X) of the push rod to communicate with the first fluid passage, and a push in the longitudinal direction of the push rod (X) A seal structure forming portion that is provided at the end of the rod projecting side (X1) so as to surround the outer periphery of the push rod accommodating space (SPi), and can form a seal structure in contact with the first taper portion (21). (53, 163) and a main body (51) having a male screw portion (54) that can be screwed with the female screw portion (22) along the longitudinal direction of the push rod (X),
With
When the female screw portion (22) and the male screw portion (54) are screwed together,
The seal structure forming part (53, 163) abuts on the first taper part (21),
The push rod (52) has a portion protruding from the push rod housing space (SPi), a part of which is in contact with a part of the nut member (20), and the push rod is arranged along the push rod longitudinal direction (X). Move to the opposite side (X2) of the protruding side, and connect the second fluid passage (Pp) and the communication passage (Pi2).
Joint (50, 60). The seal structure forming portion (53, 163) is a second taper portion (53) that is inclined toward the opposite side (X2) of the push rod protruding side in the push rod longitudinal direction (X) toward the outer peripheral side.
The joint (50) according to claim 1. The angle (δ) formed by the inclination direction (Si1) of the second taper portion (53) with the push rod longitudinal direction (X) is a state in which the female screw portion (22) and the male screw portion (54) are screwed together. In which the inclination direction (Sp) of the first taper portion (20) is equal to or less than the angle (β) formed with the longitudinal direction of the push rod (X).
The joint (50) according to claim 2. The second taper part (53) is provided with first protrusions (123a, 123b) protruding to the outer peripheral side,
The first protrusions (123a, 123b) are in contact with the first taper part (21) to form a seal structure.
The joint according to claim 2 or 3. The seal structure forming portion (53, 163) is a convex spherical portion (163).
The joint according to claim 1. The seal structure forming portions (53, 163) include seal members (145, 155, 175) as separate bodies,
The seal members (145, 155, 175) form a seal structure by deforming in contact with the first taper portion (21).
The joint according to any one of claims 1 to 5. The seal structure forming portions (53, 163) further include grooves (147, 187) for supporting the seal members (145, 155, 175).
The joint according to claim 6. The push rod (52) has a second projecting portion (52a) projecting to the outer peripheral side at a portion projecting from the push rod accommodating space (SPi), and the second projecting portion is the first tapered portion ( 21), and moves to the opposite side (X2) of the push rod protruding side along the push rod longitudinal direction (X) to connect the second fluid passage (Pp) and the communication passage (Pi2). ,
A joint (50) according to any of the preceding claims. The second projecting portion (52a) has a third taper portion (52b) that is inclined toward the opposite side (X2) of the push rod protruding side in the push rod longitudinal direction (X) toward the outer peripheral side,
In the push rod, the third taper portion abuts on the first taper portion (21), and moves along the push rod longitudinal direction (X) to the opposite side (X2) of the push rod protrusion side. Two fluid passages (Pp) and the communication passage (Pi2) are communicated with each other.
The joint (50) according to claim 8. The push rod (62) is provided at the end of the push rod protruding side (X1) in the push rod longitudinal direction (X), and is opposite to the push rod projecting side in the push rod longitudinal direction (X) toward the outer peripheral side. A fourth taper portion (62c) inclined toward (X2), the fourth taper portion abutting against the first taper portion (21), and a push rod along the push rod longitudinal direction (X) Move to the opposite side (X2) of the protruding side, and connect the second fluid passage (Pp) and the communication passage (Pi2).
A joint (60) according to any of the preceding claims. The fourth fluid passage of the pipe (30) having the third fluid passage through which the fluid passes, the fourth fluid passage (Pf), and the fifth taper portion (31) inclined toward the end portion in the radial direction. A joint (50) for communicating with (Pf),
A push rod (52);
A push rod housing space (SPi) for housing the push rod (52) so that a part of the push rod (52) protrudes along the push rod longitudinal direction (X), and the push rod housing space (SPi). A communication passage (Pi2) provided on the opposite side (X2) of the push rod protruding side in the push rod longitudinal direction (X) to communicate with the third fluid passage, and a push in the push rod longitudinal direction (X) A seal structure forming portion that is provided at the end of the rod projecting side (X1) so as to surround the outer periphery of the push rod housing space (SPi), and can form a seal structure in contact with the fifth taper portion (31) (53, 163) and a main body (51) having a male screw portion (54),
Along the push rod longitudinal direction (X), an internal thread portion (42) that can be screwed with the external thread portion (54), an opening (HL) for inserting the pipe (30), and toward the outer peripheral side A nut member (40) having a sixth taper portion (41) inclined toward the female screw portion side;
With
In a state where the pipe (30) is inserted into the opening (HL) so that the fifth taper portion (31) contacts the sixth taper portion (41), the female screw portion (42) and the male screw portion ( 54) are screwed together,
The seal structure forming part (53, 163) and the sixth taper part (41) sandwich a part of the fifth taper part (31),
The push rod (52) is pushed along the longitudinal direction (X) of the push rod with a part of the portion protruding from the push rod housing space (SPi) abutting against the other portion of the fifth taper portion (31). Move to the opposite side (X2) of the rod protruding side, and connect the fourth fluid passage (Pp) and the communication passage (Pi2).
Fittings. The seal structure forming portion (53, 163) is a seventh taper portion (53) which is inclined toward the opposite side (X2) of the push rod protruding side in the push rod longitudinal direction (X) toward the outer peripheral side.
The joint according to claim 11. The angle (δ) formed by the inclination direction (Si1) of the seventh taper portion (53) with the push rod longitudinal direction (X) is a state in which the female screw portion (42) and the male screw portion (54) are screwed together. In the sixth taper portion (41), the inclination direction (Sf) is equal to or less than the angle (γ) formed with the push rod longitudinal direction (X).
The joint (50) according to claim 12. The seventh taper portion (53) is provided with third protrusion portions (123a, 123b) protruding toward the outer peripheral side,
The third protrusions (123a, 123b) are in contact with the fifth taper part (31) to form a seal structure.
The joint according to claim 12 or 13. The seal structure forming portion (53, 163) is a convex spherical portion (163).
The joint (50) according to claim 11. The seal structure forming portions (53, 163) include seal members (145, 155, 175) as separate bodies,
The seal members (145, 155, 175) form a seal structure by deforming in contact with the fifth taper portion (31).
The joint according to any one of claims 11 to 15. The seal structure forming portion (53, 163) further includes grooves (147, 187) for supporting the seal members (145, 155, 175).
The joint according to claim 16. The push rod (52) has a fourth projecting portion (52a) projecting to the outer peripheral side at a portion projecting from the push rod accommodating space (SPi), and the fourth projecting portion is the fifth tapered portion ( 21) abuts against the other portion and moves along the longitudinal direction (X) of the push rod to the opposite side (X2) of the push rod protruding side, and the fourth fluid passage (Pp) and the communication passage (Pi2) To communicate,
The joint according to any one of claims 11 to 17. The fourth protrusion (52a) has an eighth taper portion (52b) that is inclined toward the opposite side (X2) of the push rod protrusion side in the push rod longitudinal direction (X) toward the outer peripheral side,
In the push rod, the eighth taper portion contacts the other portion of the fifth taper portion (21), and moves to the opposite side (X2) of the push rod protrusion side along the push rod longitudinal direction (X). , Communicating the fourth fluid passage (Pp) and the communication passage (Pi2),
The joint according to claim 18. The push rod (62) is provided at the end of the push rod protruding side (X1) in the push rod longitudinal direction (X), and is opposite to the push rod projecting side in the push rod longitudinal direction (X) toward the outer peripheral side. A ninth taper portion (62c) inclined toward (X2), the ninth taper portion abutting against the other portion of the fifth taper portion (21), and along the push rod longitudinal direction (X) And move to the opposite side (X2) of the push rod protruding side to connect the fourth fluid passage (Pp) and the communication passage (Pi2).
The joint according to any one of claims 11 to 17.

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