CN210770782U

CN210770782U - Sealing pipe joint

Info

Publication number: CN210770782U
Application number: CN201921580119.5U
Authority: CN
Inventors: 贾建东; 张虞旭驹; 潘哲
Original assignee: Hangzhou Cobetter Filtration Equipment Co Ltd
Priority date: 2019-09-23
Filing date: 2019-09-23
Publication date: 2020-06-16
Anticipated expiration: 2029-09-23

Abstract

The utility model relates to a sealed coupling, include: the connector comprises a connector main body, a bead and a screw cap; the joint body includes a body tube portion, an outer tube portion and an inner tube portion, the outer tube portion is coaxially projected from the body tube portion to one side of the axial center direction, the inner tube portion is provided on the radial inner side of the outer tube portion and coaxially projected from the body tube portion in the same direction as the outer tube portion so that the projecting end is closer to the body tube portion side than the projecting end of the outer tube portion, and a first insertion groove opened to one side of the axial center direction is formed between the inner surface of the outer tube portion and the outer surface of the inner tube portion; the insert bead comprises an insert part and a connecting end, the insert part is embedded into the joint body and is cylindrical, the connecting end is far away from the insert part, and the insert part is detachably embedded into the first inserting groove to form a first sealing part and a second sealing part. The utility model aims to reach the purpose provide an installation, dismantle more laborsaving and structural strength is higher, life is more of a specified duration while does not influence sealed effect's sealed coupling.

Description

Sealing pipe joint

Technical Field

The utility model relates to a coupling, especially a sealed tube connects.

Background

In the manufacturing processes of semiconductor manufacturing, medical and pharmaceutical product manufacturing, food processing and industrial fields, various fluids (such as high-purity chemical liquid, high-purity chemical reagent and the like) are required to be used, and the fluids are necessarily conveyed through a conduit in machine equipment, and conduit joints are required to be connected between conduits and equipment. If the sealing performance of the conduit joint is not good enough or does not meet the standard, leakage and the like can be generated at the joint, obviously, the situation can not be generated, and therefore, the conduit joint with excellent sealing effect is required to avoid the situation.

In the present invention patent document No. CN201580030806.8, a resin pipe joint is disclosed, which comprises a joint main body, a sleeve and a fastening member, wherein a guide pipe is sleeved on one end of the sleeve, the other end of the sleeve is connected to the joint main body, and finally the guide pipe and the sleeve are further fastened to the joint main body by the fastening member. In this aspect, the insertion rate and the magnification of the insertion portion into the groove portion are further defined, thereby achieving a better sealing effect. Through research, the scheme of the invention patent has certain defects. In this solution, the width of the slot portion is significantly smaller than the width (or thickness) of the insertion portion, and the shape of the slot portion and the cross-sectional shape of the insertion portion are both rectangular, although a certain chamfer is provided at the top end of the insertion portion and the opening of the slot portion, it is still very difficult to insert or extract, it is not easy to insert to a deeper working position during insertion, and it is very inconvenient to extract with a large force.

On the other hand, we think that the structural strength of the product in this solution also has some problems, and further, as shown in fig. 6 and analyzed in the process of inserting the sleeve into the joint body, when the protruding end portion 58 of the insertion portion is inserted into the joint body, because the insertion portion is thicker than the groove portion, a radial pressure F is generated on the inner cylinder portion 13 and the outer cylinder portion, and then the corresponding cross sections (broken line portions in fig. 6) of the inner cylinder portion 13 and the outer cylinder portion become relatively breakable cross sections, and a radial outward movement tendency is formed at one end of the inner cylinder portion 13 away from the main cylinder portion, and even one end of the inner cylinder portion 13 away from the main cylinder portion is expanded outward, and the structure of the corresponding portion is distorted over a long period of time, which affects the sealing effect. In a specific use scene, the sealing performance of the new pipe joint is not greatly influenced due to the relation of materials and structures, but the problem is amplified after the pipe joint is disassembled and assembled for many times, the sealing performance of the whole pipe joint product is influenced, and even the corresponding position on the joint body is broken and scrapped, so that the service life of the product is shortened.

SUMMERY OF THE UTILITY MODEL

The utility model aims to reach the purpose provide an installation, dismantle more laborsaving and structural strength is higher, life is more of a specified duration while does not influence sealed effect's sealed coupling.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

further, a sealed pipe joint, comprising: the connector comprises a connector main body, a bead and a screw cap; the joint body includes a body tube portion, an outer tube portion and an inner tube portion, the outer tube portion is coaxially projected from the body tube portion to one side of the axial center direction, the inner tube portion is provided on the radial inner side of the outer tube portion and coaxially projected from the body tube portion in the same direction as the outer tube portion so that the projecting end is closer to the body tube portion side than the projecting end of the outer tube portion, and a first insertion groove opened to one side of the axial center direction is formed between the inner surface of the outer tube portion and the outer surface of the inner tube portion; the insert bead comprises an insert part and a connecting end, the insert part is embedded into the cylindrical joint main body, the connecting end is far away from the insert part, and the insert part is detachably embedded into the first slot to form a first sealing part and a second sealing part; the connecting end is arranged in a radial protruding manner in the direction far away from the axis; the nut is in threaded connection with the joint main body; flow channels for fluid circulation are arranged in the joint main body and the bead; the width of the first slot is gradually reduced from the opening to the bottom.

Further, the inner surface of the outer cylinder part is a first groove wall, the outer surface of the inner cylinder part is a second groove wall, and the first groove wall and/or the second groove wall are/is provided with an inclined surface.

Further, the inclination angles of the first groove wall and the second groove wall in the axial direction are both set to be 0.5-5 degrees.

Furthermore, the inclination angle of the first groove wall is smaller than that of the second groove wall.

Furthermore, a chamfer is further arranged at the opening of the first slot on the second slot wall, and the chamfer is arranged on one side of the inner surface of the inner barrel part.

Further, the included angle between the outer surface and the inner surface of the insertion part and the horizontal axial direction is set to be 0-5 degrees.

Furthermore, a second slot used for being matched with the inner cylinder part is formed between the inserting part and the inner wall of the bead in the circumferential direction, the inner surface of the second slot is a third slot wall, the outer surface of the second slot is a fourth slot wall, and a third sealing part is formed between the third slot wall and the inner cylinder part.

Furthermore, the width of the second slot is gradually reduced from the opening to the bottom.

Further, the third groove wall and/or the fourth groove wall are/is provided with a slope.

Furthermore, after the inner cylinder part is inserted into the second slot, the insertion depth of the inner cylinder part is at least 0.8 times of the total depth of the second slot.

The utility model discloses compare the advantage that exists among the prior art and lie in: 1. the first slot is made into a form that the width is gradually reduced from the opening end to the bottom, so that when the bead is inserted into the joint main body, the bead is more convenient compared with the traditional mode, and the sealing effect is multiplied along with the increase of the insertion depth; meanwhile, the beads can be conveniently pulled out of the street main body. 2. The first slot is approximately in a V-shaped structure, so that the structural strength of the inner cylinder part can be increased to a certain extent, and the service life of the inner cylinder part is prolonged. 3. The whole scheme is provided with a plurality of sealing structures, so that the sealing performance of the sealing pipe joint can be further improved.

Drawings

The present invention will be further explained with reference to the accompanying drawings:

fig. 1 is a schematic structural view of a sealing pipe joint of the present invention;

FIG. 2 is an enlarged view of a portion at A;

FIG. 3 is a partial enlarged view at B;

FIG. 4 is a schematic view of the structure of the bead and fitting body when assembled;

FIG. 5 is a partial enlarged view at C;

FIG. 6 is a schematic representation of a prior art insert bead inserted into a fitting body.

In the figure: 1. a connector body; 11. an outer cylinder portion; 12. an inner cylinder part; 121. chamfering; 13. a main body cylinder part; 14. a first slot; 141. a first slot wall; 142. a second slot wall; 2. putting beads; 21. an insertion portion; 22. a connecting end; 23. a second slot; 231. a third tank wall; 232. a fourth slot wall; 3. a nut; 4. a conduit.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

A sealed pipe joint as shown in figure 1 is composed of a joint main body 1, a ball 2 and a nut 3. When the connector is used, the three are coaxially matched, the conduit 4 is expanded to be sleeved into the connecting end 22 of the bead 2, the inserting part 21 of the bead 2 is inserted into the connector main body 1, and finally the nut 3 is sleeved outside the bead 2 and the connector main body 1 to be screwed and fixed; flow passages for fluid to flow are formed in the joint body 1 and the bead 2, so that the fluid can smoothly flow through the inside of the sealed pipe joint after the sealed pipe joint is assembled.

In the present embodiment, the joint body 1 includes a body tube portion 13, an outer tube portion 11, and an inner tube portion 12, and the outer tube portion 11 is provided to coaxially project from the body tube portion 13 toward one side in the axial direction thereof; the inner cylinder portion 12 is provided radially inward of the outer cylinder portion 11 and protrudes coaxially with the outer cylinder portion 11 in the same direction from the main body cylinder portion 13 so that the protruding end is closer to the main body cylinder portion 13 side than the protruding end of the outer cylinder portion 11 (that is, the axial length or height of the outer cylinder portion 11 is longer than the axial length or height of the inner cylinder portion 12) such that a first insertion groove 14 that opens to one side in the axial direction is formed between the inner surface of the outer cylinder portion 11 and the outer surface of the inner cylinder portion 12. (where we define the inner and outer surfaces as follows: the surface of the same location near the axis is called the inner surface, and the surface away from the axis is called the outer surface, as defined throughout the specification). In particular, the slot shape of the first slot 14 is defined in relation to the width of the first slot 14, i.e. the cross section of the first slot 14 is generally triangular, trapezoidal or other shapes corresponding to the gradually decreasing slot width, such as the two inner surfaces of the first slot 14 are provided as arc surfaces with gradually decreasing width. In the present embodiment, the first slot 14 is specifically arranged as shown in fig. 2. With such an arrangement, the insertion portion 21 of the bead 2 is very easy and easy to insert when the first slot 14 is initially inserted, and as the insertion depth increases, the slot width of the first slot 14 becomes smaller and smaller, which results in a larger pressure between the insertion portion 21 of the bead 2 and the first slot 14, and further causes a larger friction force there, thereby achieving an effect of better and better sealing performance. Meanwhile, due to the structural arrangement that the width of the opening of the first slot 14 is large and the width of the bottom is small, the thickness of the outer cylinder part 11 or the inner cylinder part 12 close to one side of the joint main body 1 is thick, so that the structural strength of the part can be increased, the part is not easy to deform in the long-term use process, and the service life of a product is correspondingly prolonged. From another perspective, such a structural arrangement also enables the pressure acting on the inner surface of the first slot 14 to generate a component force in the horizontal axis direction, which is smaller than the pressure directly acting on the inner surface of the slot portion when the insert bead 2 is inserted in the prior art, and from this perspective, the service life of the product can be prolonged to a certain extent.

In the present embodiment, the insert 2 includes an insertion portion 21 inserted into the joint body 1 in a cylindrical shape and a connection end 22 away from the insertion portion 21, and the insertion portion 21 is detachably inserted into the inside of the first insertion groove 14 to form a first seal portion and a second seal portion. The first seal portion here specifically means a position where the insertion portion 21 collides with the inner surface of the outer cylinder portion 11; and the second seal portion specifically refers to a position where the insertion portion 21 interferes with the outer surface of the inner tube portion 12; the connecting end 22 of the inlet bead 2 is arranged in a radial protruding manner in the direction away from the axis, so that the expanded conduit 4 is conveniently sleeved and fixed behind the connecting end 22 and is not easy to fall off.

In the present embodiment, it is preferable to provide both inner surfaces of the first socket 14 as the first groove wall 141 and the second groove wall 142, that is, the inner surface of the outer tube portion 11 as the first groove wall 141 and the outer surface of the inner tube portion 12 as the second groove wall 142. And further defines the inclination angle of the first and

second groove walls

141 and 142 with respect to the axial direction to be between 0.5 deg. and 5 deg.. The limit of the inclination angle is the optimal inclination angle range obtained by a large number of different experiments according to different actual working conditions. If the inclination angle is too small, the horizontal axial component force is too small, and the effect of reducing the pressure is weak and can be ignored; if the inclination angle is too large, the insertion portion 21 is not easily inserted into the first slot 14 and is easily released. Since the outer cylinder portion 11 and the inner cylinder portion 12 have different thicknesses, the inclination angle of the first groove wall 141 is set smaller than that of the second groove wall 142 in consideration of the fact that the entire thickness of the inner cylinder portion 12 is thinner than that of the outer cylinder portion 11. The benefits of such an arrangement are: when the same pressure is applied to the inner cylindrical portion 12, the larger the inclination angle of the second groove wall 142, the smaller the component force in the radial direction is, and the thickness of the inner cylindrical portion 12 near the end of the joint body 1 is increased when the insert 2 is inserted, so that the structural strength of the insertion structure can be further ensured, and the service life of the product can be prolonged. In order to facilitate the insertion of the insertion portion 21 of the ball 2, a chamfer 121 is further disposed at an opening of the second groove wall 142 corresponding to the first groove wall 141, that is, the chamfer 121 is disposed at one side of the inner surface of the inner tube 12 and away from one end of the joint body 1, where the chamfer 121 is disposed to facilitate the insertion of the insertion portion 21 of the ball 2 into the first slot 14, so in this embodiment, two sections of structures with different inclinations are disposed at the opening of the second groove wall 142 corresponding to the first slot 14, and the functions and effects of each section are different.

As shown in FIG. 3, the specific structure of the insertion portion 21 of the insert 2 is shown. Structurally, a second slot 23 for fitting the inner tube part 12 is formed circumferentially between the insertion part 21 and the inner wall of the insert bead 2, that is, the second slot 23 is formed in the thickness direction of the insertion part 21. The inner surface of the second socket 23 is referred to as a third socket wall 231, the outer surface of the second socket 23 is referred to as a fourth socket wall 232, and a third seal portion is formed between the third socket wall 231 and the inner cylindrical portion 12. The third sealing portion is arranged to increase the number of the sealing portions of the sealing joint, namely, multiple sealing effects are generated, certain sealing effects can be achieved through the standby third sealing portion when the first sealing portion or the second sealing portion fails, the service life of the sealing pipe joint is prolonged, and the service life of the sealing pipe joint is prolonged. The specific connection structure of the inlet bead 2 when inserted into the joint body 1 is schematically shown in fig. 4 and 5.

In the embodiment, the second slot 23 is further limited, and the second slot 23 is configured to have a gradually decreasing width from the opening to the bottom, so that the inner cylinder portion 12 can be inserted into the second slot, and the sealing effect of the third sealing portion can be increased along with the increase of the insertion depth, and further, the structural strength of the second slot can be improved to a certain extent. In a specific implementation, third slot wall 231 and fourth slot wall 232 are both beveled, and the angle of inclination of third slot wall 231 is set greater than the angle of inclination of fourth slot wall 232, with the included angle opening formed between third slot wall 231 and fourth slot wall 232 being between about 15 ° and about 55 °. Since the width of the insertion portion 21 is slightly greater than or equal to the width of the first slot 14, when the ball 2 is inserted into the first slot 14, the first slot 14 is pressed to generate flaring deformation or flaring deformation, and the included angle between the third slot wall 231 and the fourth slot wall 232 is in such a range, so that the inner tube portion 12 can be inserted into the second slot 23 no matter whether the flaring shape of the first slot 14 is large or small. And the deformation tendency of the first slot 14 is reduced and the structural strength thereof is increased by the action of the second slot 23. In the process of inserting the inner tube portion 12 into the second insertion groove 23, the depth of insertion of the inner tube portion 12 is at least 0.8 times the total depth of the second insertion groove 23. This limitation of the insertion depth of the inner barrel portion 12 can ensure that the structural strength and sealing effect of the third seal portion are in an optimum state. If the depth of insertion of the inner tube portion 12 is less than 0.8 times the total depth of the second insertion groove 23, the sealing effect of the third seal portion is not ensured, and the structural strength of the third seal portion is reduced to some extent due to an excessive non-insertion space.

To illustrate the advantages that the first slot 14 can provide in accordance with the present embodiment, we have performed relevant experiments to verify that four sets of samples, set a: the connector comprises a connector main body 1, a bead 2 and a screw cap 3, wherein a first groove wall 141 and a second groove wall 142 are both arranged to be inclined planes; group B: the connector comprises a connector body 1, a ball 2 and a screw cap 3, wherein a first groove wall 141 is arranged to be an inclined surface, and a second groove wall 142 is arranged to be a plane parallel to the axial direction; group C: the connector comprises a connector body 1, a bead 2 and a screw cap 3, wherein a first groove wall 141 is arranged to be a plane parallel to the axial direction, and a second groove wall 142 is arranged to be an inclined plane; group D: comprises a connector body 1, a bead 2 and a screw cap 3, wherein a first groove wall 141 and a second groove wall 142 of the connector body are both arranged to be planes parallel to the axial direction (namely, a product in the prior art). In order to simulate factors such as aging of the joint material when the actual sealed pipe joint was used, heating (150 ℃ C., 1 hour) and cooling (25 ℃ C., 6 hours) were repeated in a lump for four groups of samples before the experiment. Experiment one: respectively placing the group A sample, the group B sample, the group C sample and the group D sample under the working condition of 0.75MPa at normal temperature for carrying out sealing performance test, and recording leakage time, wherein the details are shown in the following table I; experiment two: the group a, group B, group C and group D samples were each subjected to a sealing performance test at 180 ℃ at 0.097MPa, and the leak time was recorded, as detailed in table two below.

Table one:

table two:

from the above table i and table ii, it can be clearly concluded that, no matter under any working condition, when any one of the first slot wall 141 and the second slot wall 142 of the first slot 14 is set as a slope, the sealing effect of the product is better than that of the prior art (i.e. samples D1-D5 of group D); when the first slot wall 141 and the second slot wall 142 of the first slot 14 are both configured as slopes, the sealing performance is better than that when a single surface of the first slot wall 141 or the second slot wall 142 is configured as a slope. Therefore, the comprehensive experiment conclusion shows that the sealing effect and the service life of the groove part structure with certain inclination are improved to a certain extent compared with the traditional structure.

In this embodiment, the surface of the inner cylinder 12 abutting against the third groove wall 231 is also provided as an inclined surface, and the inclined angle is larger than the inclined angle of the third groove wall 231, so as to further ensure the sealing pressure at the third sealing portion and increase the sealing effect of the third sealing portion. To demonstrate the effect of this feature, the following experiment three was performed: respectively placing the sample e, the sample f and the sample g under the working conditions of 0.75MPa and normal temperature for carrying out the tightness test, and recording related experimental data as shown in the following table III; experiment four: the sample e, the sample f and the sample g are placed under the working condition of 0.097MPa and 180 ℃ for sealing performance test, and relevant experimental data are recorded as shown in the following table four. The three samples all include the connector body 1, the bead 2 and the nut 3, wherein the first groove wall 141 and the second groove wall 142 of the first slot 14 on the connector body 1 are both provided with inclined surfaces, and the three samples are different only in that in the sample e, the inclination angle of the surface of the inner cylinder part 12, which is in contact with the third groove wall 231, is larger than that of the third groove wall 231; in the sample f, the inclination angle of the surface of the inner cylindrical portion 12 abutting against the third cell wall 231 is smaller than the inclination angle of the third cell wall 231; in the sample g, the inclination angle of the surface of the inner cylindrical portion 12 abutting against the third groove wall 231 is equal to the inclination angle of the third groove wall 231. And simultaneously carrying out the treatment of simulating the actual working conditions on the sample e, the sample f and the sample g, namely uniformly and repeatedly heating (150 ℃, 1 hour) and cooling (25 ℃, 6 hours) for 10 times on four groups of samples before the experiment.

Table three: 0.75MPa, normal temperature working condition

Table four: 0.097MPa and 180 DEG C

By observing the data in table three and table four, it can be easily found that the sealing effect of sample e and sample f is slightly better than that of sample g no matter under what working condition. Also, considering the case of the actual use operation, the sample e is more easily inserted into the second insertion groove 23 than the sample f, and therefore, the embodiment of the sample e is more preferable.

The preferred embodiments of the present invention have been described in detail, but it should be understood that various changes and modifications can be made by those skilled in the art after reading the above teaching of the present invention. Such equivalents are intended to fall within the scope of the claims appended hereto.

Claims

1. A sealed pipe joint, comprising: the connector comprises a connector main body, a bead and a screw cap; the joint body includes a body tube portion, an outer tube portion and an inner tube portion, the outer tube portion is coaxially projected from the body tube portion to one side of the axial center direction, the inner tube portion is provided on the radial inner side of the outer tube portion and coaxially projected from the body tube portion in the same direction as the outer tube portion so that the projecting end is closer to the body tube portion side than the projecting end of the outer tube portion, and a first insertion groove opened to one side of the axial center direction is formed between the inner surface of the outer tube portion and the outer surface of the inner tube portion; the insert bead comprises an insert part and a connecting end, the insert part is embedded into the cylindrical joint main body, the connecting end is far away from the insert part, and the insert part is detachably embedded into the first slot to form a first sealing part and a second sealing part; the connecting end is arranged in a radial protruding manner in the direction far away from the axis; the nut is in threaded connection with the joint main body; flow channels for fluid circulation are arranged in the joint main body and the bead; the sealing pipe joint is characterized in that: the width of the first slot is gradually reduced from the opening to the bottom.

2. The sealed pipe joint of claim 1, wherein the inner surface of the outer barrel portion is a first groove wall, the outer surface of the inner barrel portion is a second groove wall, and the first groove wall and/or the second groove wall are provided as a slope.

3. The sealed pipe joint of claim 2, wherein the angles of inclination of the first and second groove walls in the axial direction are each set between 0.5 ° and 5 °.

4. The sealed pipe joint of claim 3, wherein the angle of inclination of the first groove wall is less than the angle of inclination of the second groove wall.

5. The sealed pipe joint according to claim 2, wherein the second groove wall is further provided with a chamfer at an opening of the first slot, the chamfer being provided on an inner surface side of the inner cylindrical portion.

6. The sealed pipe joint of claim 1, wherein: the included angle between the outer surface and the inner surface of the insertion part and the horizontal axial direction is set to be 0-5 degrees.

7. The sealed pipe joint of claim 1, wherein: a second slot used for being matched with the inner cylinder part is formed between the inserting part and the inner wall of the bead in the circumferential direction, the inner surface of the second slot is a third slot wall, the outer surface of the second slot is a fourth slot wall, and a third sealing part is formed between the third slot wall and the inner cylinder part.

8. The sealed pipe joint according to claim 7, wherein: the width of the second slot is gradually reduced from the opening to the bottom.

9. The sealed pipe joint according to claim 8, wherein: the third groove wall and/or the fourth groove wall are/is provided with a slope.

10. The sealed pipe joint according to claim 7, wherein: after the inner cylinder part is inserted into the second slot, the insertion depth of the inner cylinder part is at least 0.8 times of the total depth of the second slot.