JP2015102103A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint enabled to connect a Ferrule pipe easily.SOLUTION: A pipe joint 10 comprises: a joint body 18 including a first tubular part 12, a second tubular part 14 and a connection part 16 for connecting the first tubular part and the second tubular part; and a pair of fixing levers 22a and 22b pivotally set in paired openings 20a and 20b of the joint body. The curved pushing pressure faces 44 of the fixing levers 22a and 22b are formed such that the normal line N at the position, where the fixing levers 22a and 22b engage with a flange 4 when at the connection positions, may pass inside with reference closer to the radial direction of the second tubular part 14 than to the center axis C of the pivot with respect to the second tubular part 14 of the fixing levers 22a and 22b.

Description

  The present invention relates to a pipe joint for connecting and fixing a ferrule pipe.

  Normally, pipes used for sanitary piping in food manufacturing plants are provided with flanges called ferrules at the ends, and when connecting pipes for piping, packing between each other's ferrules is put between them. The clamp members are tightened by surrounding them with a ferrule clamp made up of two semicircular clamp members while being put in contact with each other (Patent Document 1). When performing a connecting operation using such a ferrule clamp, it is necessary to perform the clamping operation while aligning the two pipes to be connected and holding the ferrule at the end with the packing interposed therebetween. Such work may be difficult to perform by only one worker. If the ferrule tube is long and heavy, the connecting operation becomes more difficult.

  On the other hand, instead of connecting through the ferrule as described above, the end of one tube is inserted into the end of the other tube, and the fixing lever provided at the end of the other tube is rotated. By moving, there is means for attracting and fixing the end of the one tube to the end of the other tube (Patent Document 2). Such a connection means is easier to work than the connection work using the ferrule clamp described above.

JP 2009-115167 A Japanese Patent No. 3314009

  An object of the present invention is to provide a pipe joint in which the ferrule pipes can be easily connected in view of the conventional techniques as described above.

That is, the present invention
A pipe joint for connecting a ferrule pipe having a flange (ferrule) extending radially outward and circumferentially at an end,
A first tubular portion; a second tubular portion provided coaxially with the first tubular portion at an end of the first tubular portion and having a larger inner diameter than the first tubular portion; the first tubular portion; A connecting portion for connecting the second tubular portion with respect to the axes of the first and second tubular portions between the inner peripheral surface of the first tubular portion and the inner peripheral surface of the second tubular portion; A coupling body having an annular step surface extending annularly in a vertical plane, the second tubular portion having an inner diameter capable of receiving the flange and diametrically mutually A joint body having a pair of openings extending in a direction facing away from the connecting portion from a position adjacent to the connecting portion at opposing positions;
A pair of fixing levers set in the opening and pivotally attached to the second tubular portion so as to be pivotable between a connecting position and a releasing position in a plane passing through the axis and the opening. And, in the connecting position, enters the second tubular portion from the opening to fix the flange in the second tubular portion, and in the released position, exits from the second tubular portion, and the flange is the second tubular portion. A connecting portion that is positioned so as to be able to enter and exit in the direction of the axis with respect to the tubular portion; the connecting portion engages with the flange at the connecting position so that the flange is brought into contact with the annular step surface; A fixing lever having a curved pressing surface to be pressed toward,
With
The curved pressing surface of the connecting portion of the fixing lever engages with the flange when the fixing lever is moved from the release position toward the connecting position, and the fixing lever is moved to the connecting position. As it approaches, the flange is gradually curved toward the annular step surface,
The curved pressing surface of the connecting portion of the fixing lever is also configured such that a normal line of the curved pressing surface at a position where the fixing lever engages with the flange when the fixing lever is set to the connecting position. There is provided a pipe joint characterized in that it is shaped so as to pass inward with respect to a radial direction of the second tubular portion relative to a central axis of a pivot of the lever with respect to the second tubular portion.

  In this pipe joint, the ferrule pipe can be connected by inserting the flange of the ferrule pipe into the second tubular portion of the joint body and moving the fixing lever from the release position to the connection position. Compared to the connection work using rule clamps, the connection work can be simplified. In addition, since the curve pressing surface of the fixing lever is such that the normal line at the position where it engages with the flange at the coupling position passes through the inner side of the central axis of the pivoting of the fixing lever, The force that the fixing lever receives from the ferrule when receiving a force in the direction away from the pipe joint becomes the force in the direction that rotates the fixing lever in the direction opposite to the release position. As a result, it is possible to prevent the fixing lever from unintentionally pivoting to the release position due to the force received from the ferrule and detaching the ferrule. Normally, for safety, the connection with the ferrule tube is released in a state where no internal pressure is applied. However, if the ferrule is removed by pivoting the fixing lever while the pressure is high. The force required to pivot the locking lever is greater than normal. As a result, the operator can recognize that pressure is applied to the inside, so it is possible to prevent inadvertent situations such as inadvertently blowing out high-pressure fluid inside the pipe or blowing off the ferrule tube. Become. In addition, by setting the direction of the normal while taking into account the influence of the inner diameter of the ferrule tube and the amount of friction between the fixing lever and the flange, an internal pressure exceeding a specified value is applied. In this case, it is possible to prevent the fixing lever from being operated by the normal operator's force.

  Preferably, an annular seal member set in the annular cross section of the joint body, further comprising a seal member sealingly engaged with the flange of the ferrule tube fixed by the fixing lever. Can do.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a pipe joint according to the present invention will be described with reference to the accompanying drawings.

It is a perspective view of a pipe joint concerning one embodiment of the present invention. It is sectional drawing of the pipe joint of FIG. It is sectional drawing of the state in the middle of pivoting the fixing lever of the pipe joint of FIG. 2 toward a connection position. It is sectional drawing of the state which pivoted a pair of fixing lever of the pipe joint of FIG. 2 to a connection position. FIG. 2 is a cross-sectional view of a state where only one fixing lever of the pipe joint of FIG. 1 is pivoted to a coupling position.

  As shown in FIGS. 1 and 2, a pipe joint 10 according to an embodiment of the present invention includes a first tubular portion 12, a second tubular portion 14 provided coaxially with the first tubular portion 12, and a first tubular portion 10. A joint body 18 having a connecting portion 16 that connects the tubular portion 12 and the second tubular portion 14, and a pair of openings 20 a and 20 b formed in the second tubular portion 14 of the joint body 18. And a pair of fixing levers 22a and 22b provided so as to be pivotable. The diameter of the inner peripheral surface 26 of the second tubular portion 14 that is larger than the inner peripheral surface 24 of the first tubular portion 12 is sized to receive the flange 4 that is the ferrule of the ferrule tube 2 that is a connection partner. . The pipe joint 10 is configured to connect and fix the ferrule pipe 2 by operating the fixing levers 22a and 22b in a state where the ferrule pipe 2 is received in the second tubular portion.

  The connecting portion 16 is perpendicular to the axis L of the first and second tubular portions 12, 14 between the inner peripheral surface 24 of the first tubular portion 12 and the inner peripheral surface 26 of the second tubular portion 14. An annular step surface 28 extending in an annular shape in the plane is formed. An annular seal member 30 is set on the annular step surface 28 so as to be hermetically engaged with the engagement end surface 6 of the flange 4 of the ferrule tube 2. An annular seal member engagement groove 32 is formed in a portion of the inner peripheral surface 26 of the second tubular portion 14 that is connected to the annular step surface 28, and the seal member 30 has an annular shape formed on the outer peripheral surface thereof. The engagement protrusion 34 is fixed to the joint body 18 by being fitted in the seal member engagement groove 32.

  As shown in FIG. 1, the pair of openings 20 a and 20 b formed in the second tubular portion 14 of the joint body 18 are parallel to the axis L in a direction away from the connecting portion 16 from a position adjacent to the connecting portion 16. It has an elongated shape extending in the direction. On both sides of these openings 20a and 20b, a lever holding portion 36 is provided so as to protrude outward from the outer peripheral surface 37 of the second tubular portion 14. The fixing levers 22a and 22b are pivotally attached to the joint body 18 by a pivot shaft 38 fixed to the lever holding portion 36, and are between the release position shown in FIG. 2 and the connection position shown in FIG. It is possible to pivot. The fixing levers 22 a and 22 b include a connecting portion 40 through which the pivot shaft 38 is passed, and an operation portion 42 that extends narrowly from the connecting portion 40 in a direction away from the pivot shaft 38. In the connection state of FIG. 4, the connecting portion 40 is engaged with the flange 4 of the ferrule tube 2 and presses the flange 4 toward the annular step surface 28, and is connected to the curved pressing surface 44. When the fixing lever is at the coupling position shown in FIG. 4, an engagement holding surface 46 extending in parallel with the axis L is provided at a position close to the outer peripheral surface 8 of the ferrule tube 2.

  When connecting the pipe joint 10 to the ferrule pipe 2, first, the fixing levers 22 a and 22 b are set to the release positions shown in FIG. 2, and the ferrule pipe 2 is inserted into the second tubular portion 14 of the joint body 18. When the fixing levers 22a and 22b are pivoted toward the connecting position, the curved pressing surface 44 is engaged with the flange 4 of the ferrule tube 2 as shown in FIG. The curved pressing surface 44 forms a cam-like curve, and when the fixing levers 22a and 22b are further pivoted, the flange 4 of the ferrule tube 2 is pressed toward the annular step surface 28 by the curved pressing surface 44. Go. As shown in FIG. 4, the fixing levers 22 a and 22 b are pivoted to a position where the contact surface 48 provided on the inner side of the operation portion 42 contacts the outer peripheral surface 37 of the second tubular portion 14 of the joint body 18. When the connection position is established, the seal member 30 fixed to the annular step surface 28 is compressed between the annular step surface 28 and the engagement end surface 6 of the ferrule tube 2, and the annular step surface 28 and the engagement end surface 6 And the connection is completed.

  The curved pressing surfaces 44 of the fixing levers 22a and 22b have a normal line N at a position engaged with the flange 4 of the ferrule tube 2 in the coupled state of FIG. The curved shape is such that it passes through the inside with respect to the radial direction of the second tubular portion 14 rather than C. By making the curved pressing surface 44 into such a shape, when the ferrule pipe 2 receives a force in a direction away from the pipe joint 10 due to the seal member 30 or internal pressure, the fixing levers 22a and 22b are removed from the ferrule pipe 2. The force received is the force in the direction R that rotates the fixing levers 22a and 22b in the direction opposite to the release position. Therefore, it is possible to prevent the fixing levers 22a and 22b from being unintentionally pivoted to the release position by the force received from the ferrule tube 2 and detaching the ferrule tube 2. Normally, for safety, the connection with the ferrule tube 2 is released in a state where no internal pressure is applied, but the fixing levers 22a and 22b are pivoted while the pressure is high, and the ferrule tube 2 is removed. In such a case, the force required to pivot the fixing levers 22a and 22b becomes larger than usual. As a result, the operator can recognize that the pressure is applied to the inside, so that it is possible to prevent a situation in which the internal high-pressure fluid is inadvertently blown out or the ferrule tube 2 is blown off in advance. become. Further, by setting the direction of the normal line N in consideration of the influence of the inner diameter of the ferrule tube 2 and the magnitude of friction between the fixing levers 22a and 22b and the flange 4, the internal pressure exceeding a specified value can be obtained. In a state where the lever is applied, it is possible to prevent the fixing levers 22a and 22b from being operated by a normal operator's force.

  The pipe joint 10 does not pivot the pair of fixing levers 22a and 22b to the connecting position at the same time, but first pivots one fixing lever 22a to the connecting position and then the other fixing lever. It is also possible to pivot 22b to the connection position. When only one fixing lever 22a is pivoted to the connection position, as shown in FIG. 5, the flange 4 of the ferrule tube 2 is pressed only on one side and the seal member 30 is partially compressed, and the ferrule The pipe 2 is inclined to the position where the outer peripheral surface 8 abuts on the engagement holding surface 46 of the fixing lever 22a on the side of the fixing lever 22a which is the connection position. In this state, when the other fixing lever 22b is pivoted toward the coupling position, the curved pressing surface 44 engages with the flange 4 of the ferrule tube 2. By further pivoting the fixing lever 22b from the state shown in FIG. 5 toward the connection position, the flange 4 is pressed toward the annular step surface 28 to be in the connection state shown in FIG. As described above, the fixing levers 22a and 22b are provided with the engagement holding surface 46 that engages with the outer peripheral surface of the ferrule tube 2, and the tilt amount of the ferrule tube 2 is suppressed within a certain range, whereby one of the fixing levers 22a. Even when the ferrule tube 2 is tilted by pivoting only to the connection position, the position of the flange 4 can be kept within a range that can be engaged with the curved pressing surface 44 of the other fixing lever 22b. Accordingly, it is not always necessary to operate the pair of fixing levers 22a and 22b so that they are simultaneously pivoted to the connection position, and the connection of the ferrule tube 2 can be normally completed even when operated in order one by one. It becomes.

  In the above embodiment, the pair of fixing levers 22a and 22b are provided. However, an additional fixing lever may be further provided in addition to the pair of fixing levers 22a and 22b.

  Further, in the above embodiment, when only one fixing lever 22a is set to the connection position, the outer peripheral surface 8 of the ferrule tube 2 comes into contact with the one fixing lever 22a, thereby suppressing the amount of inclination of the ferrule tube 2. However, it is not always necessary that the fixing levers 22a and 22b abut on the inclined outer peripheral surface 8 of the ferrule tube 2.

Ferrule 2; Flange 4; Engagement end surface 6; Outer peripheral surface 8; Pipe joint 10; First tubular portion 12; Second tubular portion 14; Connection portion 16; Joint body 18; Openings 20a and 20b; 22b; inner peripheral surface 24; inner peripheral surface 26; annular step surface 28; seal member 30; seal member engaging groove 32; engaging protrusion 34; lever holding portion 36; outer peripheral surface 37; Part 40; operation part 42; curved pressing surface 44; engagement holding surface 46; abutment surface 48; axis L; normal N; central axis C;

Claims (2)

A pipe joint for connecting a ferrule pipe having a flange extending radially outward and circumferentially at an end,
A first tubular portion; a second tubular portion provided coaxially with the first tubular portion at an end of the first tubular portion and having a larger inner diameter than the first tubular portion; the first tubular portion; A connecting portion for connecting the second tubular portion with respect to the axes of the first and second tubular portions between the inner peripheral surface of the first tubular portion and the inner peripheral surface of the second tubular portion; A coupling body having an annular step surface extending annularly in a vertical plane, the second tubular portion having an inner diameter capable of receiving the flange and diametrically mutually A joint body having a pair of openings extending in a direction facing away from the connecting portion from a position adjacent to the connecting portion at opposing positions;
A pair of fixing levers set in the opening and pivotally attached to the second tubular portion so as to be pivotable between a connecting position and a releasing position in a plane passing through the axis and the opening. And, in the connecting position, enters the second tubular portion from the opening to fix the flange in the second tubular portion, and in the released position, exits from the second tubular portion, and the flange is the second tubular portion. A connecting portion that is positioned so as to be able to enter and exit in the direction of the axis with respect to the tubular portion; the connecting portion engages with the flange at the connecting position so that the flange is brought into contact with the annular step surface; A fixing lever having a curved pressing surface to be pressed toward,
With
The curved pressing surface of the connecting portion of the fixing lever engages with the flange when the fixing lever is moved from the release position toward the connecting position, and the fixing lever is moved to the connecting position. As it approaches, the flange is gradually curved toward the annular step surface,
The curved pressing surface of the connecting portion of the fixing lever is also configured such that a normal line of the curved pressing surface at a position where the fixing lever engages with the flange when the fixing lever is set to the connecting position. A pipe joint characterized in that it is shaped so as to pass inward with respect to the radial direction of the second tubular portion relative to the central axis of the pivot of the lever with respect to the second tubular portion.   The annular seal member set in the annular cross section of the joint body, further comprising a seal member sealingly engaged with the flange of the ferrule tube fixed by the fixing lever. Pipe fittings.

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