TWI739427B - A sealed conduit joint - Google Patents

Abstract

The invention discloses a pipe joint, comprising: a joint main body, an inner ring and a nut; the joint main body has a main body cylinder, an outer cylinder and an inner cylinder, and the outer cylinder extends from the main cylinder to its axis. One side is coaxially protruding, the outer cylindrical portion and the inner cylindrical portion are surrounded and formed with a groove opening to one side in the axial direction, and the inner cylindrical portion is provided on the radially inner side of the outer cylindrical portion so that the protruding end The way that the protruding end of the outer cylinder is closer to the side of the main body cylinder is coaxially protruding from the main body cylinder in the same direction as the outer cylinder; The embedding end is detachably embedded in the inner side of the groove to form a sealing portion; the connecting end of the pipe is arranged to protrude radially away from the axial center, the maximum outer diameter of the protruding part of the connecting end is D1, and the inner ring is The diameter is D2; the purpose of the present invention is to provide a pipe joint with longer service life and better sealing effect.

Description

A sealed conduit joint

The invention relates to a sealed pipe joint.

In the manufacturing process of semiconductor manufacturing, medical and medical supplies manufacturing, food processing and industrial fields, various fluids (such as high-purity chemical liquids, high-purity chemical reagents, etc.) need to be used, and these fluids must be carried out through catheters in machinery and equipment. For conveying, pipe joints are required for connection between the catheter and the catheter, and between the catheter and the equipment. If the sealing of the pipe joint is not good enough or not up to the standard, leakage will occur at the joint. Obviously, this situation cannot be produced. Therefore, a pipe joint with an excellent sealing effect is required to avoid such a situation.

At present, in the Japanese patent document with the publication number JP2799562B2, a resin pipe joint is disclosed, which includes a joint body, a sleeve and a fastener; when it is used, the pipe is sleeved on one end of the sleeve, and then the other of the sleeve One end is connected to the main body of the joint, and finally the pipe and the sleeve are further fastened to the main body of the joint by using a fastener. In this way, the sealing connection effect at the joint of the pipe is realized. According to the technical solutions in the prior art, in the actual production process, we found that different inner ring sizes and different nut sizes of the sealing pipe joints will have a certain degree of influence on the service life and sealing effect of the overall sealing pipe joints. In the prior art, this has not been explained and disclosed.

In view of the shortcomings of the prior art, the purpose of the present invention is to provide a pipe joint with a longer service life and better sealing effect.

In order to achieve the above object, the present invention provides the following technical solutions: a pipe joint comprising: a joint body, an inner ring and a nut; the joint body has a main body cylinder, an outer cylinder and an inner cylinder, the outer cylinder Coaxially protruding from the main body cylinder to one side of the axis, the outer cylinder and the inner cylinder are surrounded to form a groove that opens to the axis, and the inner cylinder is provided on the outer cylinder. The inner ring is arranged to protrude coaxially from the main body cylinder in the same direction as the outer cylinder so that the protruding end is closer to the main body cylinder side than the protruding end of the outer cylinder; The connecting end of the pipe is detachably inserted into the inner side of the groove to form a sealing part; the connecting end of the pipe is radially protruding in the direction away from the axis, and the protruding part of the connecting end is the largest outward The diameter is D1, the inner diameter of the inner ring is D2; the nut is threadedly connected to the main body of the joint, and the minimum diameter of the pressing surface of the nut is D3; the inside of the joint main body and the inner ring are both provided with fluid Circulating flow channel; the relationship between the outer diameter D1, the inner diameter D2 of the inner ring inner diameter and the minimum diameter D3 of the contact surface of the nut and the inner ring satisfies D2+2.2mm<D3<D1; the inner ring The thickness of the opening on the side close to the nut is set to L1, and the relationship between L1, D2, and D3 satisfies D2+2L1<D3.

The present invention is further configured as follows: the outer diameter D1 of the protruding part of the connecting end of the catheter, the inner diameter D2 of the inner ring and the diameter D3 of the contact surface of the nut and the inner ring are specifically set as D3=1/2(D1+D2).

L1

1/4(D1-D2)。 The present invention is further configured as: the thickness of the L1 satisfies 0.1mm

L1

1/4(D1-D2).

The present invention is further provided that: the protruding part of the connecting end of the conduit includes a first end surface facing away from the nut and a second end surface facing the nut, and any point on the second end surface is on its corresponding inner ring shaft The included angle between the tangent to the second end surface and the horizontal tangent plane is θ, and the reciprocal of the tangent value of the included angle θ is smaller than the friction coefficient μ between the second end surface and the catheter, that is, μ>1/tanθ.

The present invention is further provided that: the first end surface and the second end surface are both set to be flat surfaces.

The present invention is further provided as follows: a horizontal horizontal end surface is connected between the first end surface and the second end surface.

The present invention is further configured that: the axial length of the horizontal end surface is set to be between 0.1 mm and 5 mm.

The present invention is further configured as follows: the included angle between the first end surface and the horizontal plane is α, and the α satisfies 10°<α<60°.

The present invention is further provided that: the end of the outer cylinder portion away from the main body cylinder portion is provided with a chamfer inward.

The present invention is further provided that: the opening of the nut at one end away from the main body of the joint is provided with a chamfer radially inward.

By adopting the above technical solution, in the process of concrete use of the pipe joint, the pipe is sleeved outside one end of the inner ring, and the other end of the inner ring is embedded in the joint body, and at the same time, the nut is tightened with the joint body. The contact end of the ring is just on the surface of the second end surface at the protrusion of the connecting end of the catheter and the height of the contact position from the inner wall of the inner ring is greater than the wall thickness of the catheter (that is, it needs to meet D2+2.2mm<D3<D1 and D2+2L1 at the same time. <D3 two conditions). This arrangement can ensure that when the screw cap is tightened, the duct wall will not dent inward relative to the flow channel, and can ensure the consistency of the flow channel size at the connection between the inner ring and the duct. If the height of the conflicting position from the inner wall of the inner ring is less than the thickness of the tube wall of the tube, the tube will be recessed into the flow channel, which will affect the flow of fluid. At the same time, due to the recess of the tube, the cross section of the flow channel at the recess will become smaller. Allow the pipe wall to be more impacted by the fluid, reducing its service life. The position between D2, D3 and L1 is further restricted. This arrangement can ensure that the conflicting position can fall on the second end surface. Instead of resisting the right end surface of the inner ring, if the conflicting position falls on the right end surface of the inner ring, the degree of distortion of the catheter will be increased, which will have a certain impact on the sealing effect of the connection, and also affect the service life of the catheter.

1: Connector body

11: The main body tube

12: Outer cylinder

13: inner cylinder

14: Groove

2: inner ring

21: Embedded end

22: Conduit connection end

221: first end face

222: horizontal end face

223: second end face

3: nut

4: Catheter

5: runner

A: point

D1: Outer diameter

D2: inner diameter

D3: Diameter

F: Squeeze force

Fx: component of force

Fy: component of force

L1: thickness

L2: axial length

θ: included angle

μ: friction coefficient

Hereinafter, the present invention will be further described with reference to the accompanying drawings: [Figure 1] is a schematic diagram of the structure of the sealed conduit joint of the present invention; [Figure 2] is a schematic diagram of the various dimensions of the sealed conduit joint of the present invention; [Figure 3] is the screw assembly of the present invention A partial enlarged view of the collision between the cap, the inner ring and the pipe joint; [Figure 4] is a schematic diagram of the force analysis of the collision between the nut, the inner ring and the pipe joint during assembly of the present invention; [Figure 5] is the nut during assembly of the present invention Diagram 1 of wrong size; [FIG. 6] Diagram 2 of wrong size of nut during assembly of the present invention; [FIG. 7] Diagram of wrong size of L1 during assembly of the present invention; [FIG. 8] Diagram of screw cap in the second embodiment Schematic.

In order to be able to understand the above objectives, features and advantages of the present invention more clearly, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments of the application and the features in the embodiments can be combined with each other if there is no conflict.

In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described here. Therefore, the protection scope of the present invention is not limited to the specific details disclosed below. Limitations of the embodiment.

An embodiment of a sealed pipe joint of the present invention will be further described with reference to FIGS. 1 to 5.

Embodiment 1: A sealed conduit joint as shown in Figures 1 and 2, comprising a generally cylindrical joint body 1, a generally cylindrical inner ring 2 and a generally cylindrical nut 3, the inner ring 2 One end is detachably and hermetically connected with the joint body 1; the other end of the inner ring 2 is connected with a pipe 4, and the nut 3 is threadedly connected with the joint body 1, and the pipe 4 is tightened by squeezing the inner ring 2 during the connection. It is fixed to the joint body 1; both the joint body 1 and the inner ring 2 are provided with a flow channel 5 for fluid circulation.

In this embodiment, the joint main body 1 has a main body cylinder portion 11, an outer cylinder portion 12, and an inner cylinder portion 13. At the same time, the outer cylinder portion 12 and the inner cylinder portion 13 are surrounded and formed with a groove portion that opens to one side in the axial direction. 14. The opening direction of the groove portion 14 faces the side of the inner ring 2; and a chamfer is provided at the end of the outer cylinder portion 12 away from the main body cylinder portion 11 inward to facilitate the embedding of the inner ring 2; further, the inner ring 2 includes an embedded joint body The embedding end 21 of 1 and the pipe connecting end 22 away from the embedding end 21 are here formed by the embedding and fitting of the embedding end 21 and the groove 14 to form a sealing portion, thereby achieving a detachable and sealing connection between the inner ring 2 and the joint body 1. More specifically, the embedding end 21 is further set: the outer diameter of the embedding end 21 is substantially the same as the inner diameter of the outer cylinder portion 12, and the thickness at the embedding end 21 is slightly larger than the width of the groove portion 14. The external force inserts the insertion end 21 into the groove 14.

In this embodiment, the pipe connecting end 22 of the inner ring 2 is arranged to protrude in the direction away from the axial center, and the protruding part includes a first end surface 221 facing away from the nut and a second end surface 223 facing the nut; Here, the diameter of the highest position of the protrusion is recorded as D1; the minimum inner diameter of the contact surface of the nut 3 on the side away from the joint body 1 with the pipe 4 and the inner ring 2 is recorded as D3; use different pipes of the pipe 4 according to the actual situation The wall thickness is between 1.1mm-1.6mm; the thickness at the end of the connecting end 22 of the inner ring 2 is recorded as L1, and a chamfer is provided radially inward at the end of the connecting end 22 of the inner ring 2. The relationship satisfied between D1, D2, D3 and L1 must be full at the same time Foot: D2+2.2mm<D3<D1; D2+2L1<D3. More specifically, in this embodiment, the size of D3 is selected as D3=1/2 (D1+D2), that is, the nut 3, the pipe 4, and the inner ring 2 collide at the position of the middle section of the second end surface 223, that is, As shown in Figure 3. In this way, the force on the protruding part of the connecting end 22 of the pipe can be more uniform, and the possibility of deformation and damage of the inner ring 2 due to excessive force on the upper part or excessive force on the lower part can be reduced. Satisfying the condition of D2+2.2mm<D3<D1 is to ensure that when the nut 3 is tightened, the wall of the duct 4 will not dent inward with respect to the flow channel 5, and the size of the flow channel 5 at the connection of the inner ring 2 and the duct 4 can be ensured. consistency. If the height of the conflicting position from the inner wall of the inner ring 2 is less than the wall thickness of the duct 4, that is, the above conditions are not met, the duct 4 will be recessed into the flow channel, thereby affecting the flow of fluid. At the same time, due to the recess of the duct 4, As a result, the cross section of the flow channel at the depression is reduced, so that the wall of the duct 4 is subject to greater fluid impact, and its service life is reduced, as shown in FIG. 5. Meet the condition of D2+2L1<D3, that is, to ensure that when the nut 3 is tightened, the position where it conflicts with the pipe 4 and the inner ring 2 is on the surface of the second end surface 223. If this condition is not met, the nut 3 and the inner ring The conflicting position of the ring 2 may fall on the side wall of the end thickness of the pipe connecting end 22, which will increase the degree of distortion of the pipe 4 at some positions, and adversely affect the overall service life and sealing effect, as shown in Figure 6 (for The meaning can be clearly expressed. In Fig. 6, the thickness of the end of the catheter connecting end 22 of the inner ring 2 is drawn thicker). Furthermore, in this embodiment, the nut 3 is provided with a chamfered radially inwardly away from the opening at one end of the joint body 1, and the setting of this chamfer can facilitate the insertion of the catheter 4.

L1

1/4(D1-D2)。即厚度最大不會超過第二端面223高度的一半，厚度最小不小於0.1mm，這裡將L1厚度設置為1mm。若厚度過大，超過第二端面223高度的一半，就會使螺帽3抵觸於內環2和導管4時的抵觸點過高，相對整個導管連接端22來說，上部和下部受力不均，影響其整體結構的穩定性及使用壽命，即如圖7所示。 Furthermore, the thickness at L1 is set to satisfy 0.1mm

L1

1/4(D1-D2). That is, the maximum thickness will not exceed half of the height of the second end surface 223, and the minimum thickness will not be less than 0.1 mm. Here, the thickness of L1 is set to 1 mm. If the thickness is too large, more than half of the height of the second end surface 223, the contact point when the nut 3 abuts against the inner ring 2 and the duct 4 will be too high. Relative to the entire duct connecting end 22, the upper and lower parts will receive uneven forces. , Affecting the stability and service life of its overall structure, as shown in Figure 7.

In this embodiment, a horizontal end surface 222 is connected between the first end surface 221 and the second end surface 223, and the axial length L2 of the horizontal end surface 222 is set to be between 0.1 mm and 5 mm. In the embodiment, the axial length L2 of the horizontal end surface 222 is set to 1.2 mm. The setting of the horizontal end surface 222 here also takes into account that when the catheter 4 is inserted into the catheter connecting end 22, the most bend is smoother, so as to avoid the sharp bending angle of the catheter 4 when the pressure is high during use. Excessive stress will affect its service life and sealing effect after long-term use.

Further, in this embodiment, the first end surface 221 and the second end surface 223 are both set as planes, the angle between the first end surface 221 and the horizontal plane is α, and α satisfies 10°<α<60°, which is specifically set here Is 15°. When the nut 3 is tightened to the inner ring 2, the pipe connecting end 22 of the inner ring 2 will be subjected to greater pressure, and the pipe connecting end 22 is protruding, so as a whole, the protruding part is connected to the outer wall of the inner ring 2 It is the easiest to break. In order to ensure the strength of the structure, we set the angle α between the first end surface 221 and the horizontal plane to be 30° to ensure that the thickness changes between the first end surface 221 and the outer wall of the inner ring 2 are relatively gentle, thus It is not easy to break, and it also saves materials.

Figure 4 is a schematic diagram showing the force analysis of the conflicting part of the nut, inner ring and pipe joint during assembly of the present invention. μ is the friction coefficient of the surface when the tube wall of the catheter 4 is in contact with the second end surface 223 of the inner ring 2. At the same time, the included angle between any point on the second end surface 223 and the second end surface 223 on the corresponding axial tangent surface of the inner ring 2 is denoted as θ. In the figure, the included angle between the second end surface 223 and the horizontal plane is θ. A point A on the second end surface 223 is arbitrarily taken, and the force analysis is performed on the nut 3 when the nut 3 is tightened. Point A receives the horizontal leftward squeezing force F from the nut 3, and decomposes the force in the two directions parallel to the second end surface 223 and perpendicular to the second end surface 223, and it is obtained that the direction parallel to the second end surface 223 is upward. The component force Fx and the downward component force Fy perpendicular to the second end surface 223. Fx=F×cosθ, Fy=F×sinθ. For the second end surface 223, the duct 4 is relatively inner Ring 2 does not slide and needs to satisfy Fx<Fy×μ, that is, F×cosθ<F×sinθ×μ. After simplification, μ>1/tanθ is obtained, that is, the reciprocal of the tangent value of the included angle θ is less than the second end surface 223 and The coefficient of friction between the ducts 4 is μ.

Specifically, in this embodiment, D1 is set to 31mm, D2 is set to 21mm, D3 is set to 26mm, and L1 is set to 0.3mm. At the same time, it satisfies the two conditions of D2+2.2mm<D3<D1 and D2+2L1<D3, and according to the friction coefficient between the inner ring 2 and the duct 4, specifically set the clamp θ between the second end surface 223 and the horizontal plane to 29 °.

In order to verify that the dimensions of each part of the pipe joint satisfying the two conditions of D2+2.2mm<D3<D1 and D2+2L1<D3 can indeed improve the overall tightness of the pipe joint, we also set up multiple sets of experiments. Among them, the size of each part of the pipe joint of group 1 meets the above two conditions at the same time, and the dimensions of the other groups are that the various parts of the pipe joint do not meet the above two conditions at the same time. Test the tightness of the two sets of pipe joints under the working condition of 0.097MPa, 180°C, using pipes of the same material and size, and the clamp θ between the second end surface 223 and the horizontal plane being set to 29°. Refer to the table below for specific experimental data and results.

Through the above experimental data, it is not difficult to find that when the two conditions of D2+2.2mm<D3<D1 and D2+2L1<D3 are not met at the same time, the situation as shown in Fig. 5 and Fig. 6 appears. In this case, the experimental leakage time of all groups is shorter than the time of group 1, that is, the sealing performance is not as good as group 1 that meets the two conditions of D2+2.2mm<D3<D1 and D2+2L1<D3 at the same time.

The second embodiment: Compared with the first embodiment, the second embodiment differs only in the partial structure of the nut 3, as shown in Fig. 8 for details. Specifically, the conflicting position of the nut 3 with the conduit 4 and the inner ring 2 is set as a slope, and the slope is the same as the slope of the second end surface 223. Such an arrangement can increase the contact area when the nut 3 is fixed, increase friction, and improve the sealing effect.

Embodiment 3: Compared with Embodiment 1, the difference between Embodiment 3 is only a part of the structure of the inner ring 2, as shown in Fig. 9 for details. Specifically: the end thickness L1 at the pipe connecting end 22 of the inner ring 2 is 0 mm, that is, the end of the pipe connecting end 22 is sharp. This arrangement can ensure that the screw cap 3 can abut against the second end surface when tightening. The surface of 223 solves the problem of reducing the service life of the pipe 4 when the nut 3 is tightened against the right side wall of the pipe connecting end 22 due to the size relationship.

The preferred embodiments of the present invention have been described in detail above, but it should be understood that after reading the above teaching content of the present invention, a person with ordinary knowledge in the technical field to which the present invention belongs can make various changes or modifications to the present invention. These equal forms also fall within the scope defined by the scope of the patent application attached to this application.

1: Connector body

11: The main body tube

12: Outer cylinder

13: inner cylinder

14: Groove

2: inner ring

21: Embedded end

22: Conduit connection end

3: nut

4: Catheter

5: runner

Claims (10)

A sealed pipe joint, comprising: a joint body, an inner ring and a nut; the joint body has a main body cylinder, an outer cylinder and an inner cylinder, and the outer cylinder is coaxial from the main cylinder to one side of its axis The outer cylindrical portion and the inner cylindrical portion are surrounded and formed with a groove opening to one side of the axial center, and the inner cylindrical portion is provided on the radially inner side of the outer cylindrical portion so that the protruding end is larger than the outer cylindrical portion. The protruding end of the part is closer to the side of the main body cylinder part and the outer cylinder part protrudes coaxially from the main body cylinder part in the same direction as the outer cylinder part; The end is detachably embedded in the inner side of the groove to form a sealing part; the connecting end of the pipe is arranged to protrude radially away from the axis, the maximum outer diameter of the protruding part of the connecting end is D1, and the inner diameter of the inner ring is D2 The nut is threadedly connected to the main body of the joint, and the minimum diameter of the pressing surface of the nut is D3; the inside of the joint main body and the inner ring are provided with a flow passage for fluid circulation; the characteristics of the pipe joint It is that the relationship between the outer diameter D1 of the protruding part of the connecting end of the catheter, the inner diameter D2 of the inner ring and the minimum diameter D3 of the contact surface of the nut and the inner ring satisfies D2+2.2mm<D3<D1; the inner ring is close to the nut The thickness at one side of the opening is set to L1, and the relationship between L1, D2, and D3 satisfies D2+2L1<D3. The sealed pipe joint according to claim 1, wherein the outer diameter D1 of the protruding part of the pipe connecting end, the inner diameter D2 of the inner ring and the diameter D3 of the contact surface of the nut and the inner ring are specifically set as D3=1/2(D1 +D2). The sealed conduit joint according to claim 2, wherein the thickness L1 at the opening on one side of the nut satisfies 0.1mm

L1

1/4(D1-D2). The sealed pipe joint according to claim 1, wherein the protruding part of the pipe connection end includes a first end surface on the side facing away from the nut and a second end surface on the side facing the nut, and any point on the second end surface is The corresponding included angle between the tangent to the second end face on the axial tangent surface of the inner ring and the horizontal is θ, and the reciprocal of the tangent value of the included angle θ is smaller than the friction coefficient μ between the second end face and the conduit, that is, μ>1/tanθ . The sealed conduit joint according to claim 4, wherein the first end surface and the second end surface are both set to be flat surfaces. The sealed pipe joint according to claim 4, wherein a horizontal end surface is connected between the first end surface and the second end surface. The sealed pipe joint according to claim 6, wherein the axial length of the horizontal end surface is set to be between 0.1 mm and 5 mm. The sealed conduit joint according to any one of claims 4-7, wherein the angle between the first end surface and the horizontal plane is α, and the α satisfies 10°<α<60°. The sealed conduit joint according to claim 1, wherein an end of the outer cylinder portion away from the main body cylinder portion is provided with a chamfer inward. The sealed conduit joint according to claim 1, wherein the nut is provided with a chamfer radially inward from the opening at one end of the nut away from the main body of the joint.

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