CN113007465A

CN113007465A - Pipeline connecting device

Info

Publication number: CN113007465A
Application number: CN201911329111.6A
Authority: CN
Inventors: 不公告发明人
Original assignee: Zhejiang Sanhua Intelligent Controls Co Ltd
Current assignee: Zhejiang Sanhua Intelligent Controls Co Ltd
Priority date: 2019-12-20
Filing date: 2019-12-20
Publication date: 2021-06-22

Abstract

The invention provides a pipeline connecting device, which comprises a first connecting pipe, a second connecting pipe, a nut and a connector, the nut comprises a main body part, more than two first conical table surfaces are arranged on the peripheral surface of the main body part, an operating portion recessed toward a central axis direction of the nut is provided between the first frustum surfaces, the first end of the operating part and the first frustum surface are intersected on a first sideline, at least one section of the outer diameter of the second end of the operating part is gradually reduced, and forms a convex table surface with the adjacent first frustum surface, the convex table surface and the first frustum surface are intersected at a second side line, the convex table surface and the operation part are intersected at a third side line, in any cross section located at the operating portion, a distance between a surface of the operating portion and a central axis of the nut is increased in a direction along the first end.

Description

Pipeline connecting device

Technical Field

The invention relates to the technical field of refrigeration systems, in particular to a pipeline connecting structure for a refrigeration system.

Background

In an air conditioning system, a pipeline connecting device is mainly used for connecting pipelines of a refrigeration system, and generally adopts a connecting pipe nut and a pipe joint to realize sealing and fixing of two pipes of the refrigeration system. As shown in fig. 1, fig. 1 is a general pipeline connecting device of the background art, which includes a first connecting pipe 1 ', a second connecting pipe 2', a connecting head 3 ', and a connecting pipe nut 4', wherein the connecting pipe nut 4 'is provided with an internal thread, the pipe joint 3' is provided with an external thread, and the connecting pipe nut and the pipe joint are connected by a thread. The adapter nut is provided with a hexagonal operation surface 41 ', and when in specific operation, the adapter nut is positively screwed up by clamping the operation surface 41' by a wrench to rotate clockwise so as to realize fixation. The pipeline connecting device can be screwed up in the forward direction and can be unscrewed in the reverse direction. In recent years, due to the environmental protection requirement, the air conditioning refrigerant is gradually switched to the refrigerant with stronger flammability such as R32, and in order to prevent accidents caused by improper operation, the national standard requires the air conditioner using the refrigerant, and non-professional personnel cannot disassemble the refrigerant at will, so that the design of the pipeline connecting device which is not easy to disassemble is a technical problem which needs to be solved by technical personnel in the field.

Disclosure of Invention

The object of the present invention is to provide a new pipe connection which cannot be simply disassembled by means of a wrench or the like.

The invention provides a pipeline connecting device, which comprises a first connecting pipe, a second connecting pipe, a nut and a connector, wherein the first connecting pipe is fixedly connected with the connector, the connector is in threaded connection with the nut, the connector, the nut and the second connecting pipe are limited and fixedly connected, the pipeline connecting device is characterized in that the nut comprises a main body part, more than two first frustum surfaces are arranged on the peripheral surface of the main body part, an operating part which is sunken towards the central axis direction of the nut is arranged between the first frustum surfaces, the first end of the operating part and the first frustum surfaces are intersected on a first side line, at least one section of the outer diameter of the second end of the operating part is gradually reduced, a convex table surface is formed by the second end of the operating part and the adjacent first frustum surfaces, the convex table surface and the first frustum surfaces are intersected on a second side line, and the convex table surface and the operating part are intersected on a third side line, in any cross section located at the operating portion, a distance between a surface of the operating portion and a central axis of the nut is increased in a direction along the first end.

The pipeline connecting device provided by the invention has the advantages that when the clamping nut is unscrewed in the counterclockwise direction by using a tool such as a wrench, the wrench can easily slide out along the circumferential direction of the surface of the operating part due to the gradual reduction of the clamping distance, so that the aim that the nut cannot be easily disassembled is fulfilled.

Drawings

FIG. 1 is a schematic structural diagram of a pipe connection device according to the prior art;

FIG. 2 is a perspective view of a first embodiment of a pipe coupling device according to the present invention;

FIG. 3 is a cross-sectional view of a first embodiment of a pipe coupling according to the present invention;

FIG. 4 is a schematic structural view of a first embodiment of a nut;

FIG. 5 is a cross-sectional view of the first embodiment of the nut;

FIG. 6 is a front view of the first embodiment nut;

FIG. 7 is a view A-A of FIG. 6;

FIG. 8 is a schematic structural view of a nut according to a second embodiment;

FIG. 9 is a schematic structural view of a nut according to a third embodiment;

FIG. 10 is a schematic structural view of a nut according to a fourth embodiment;

Detailed Description

In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

It should be noted that the terms of orientation, left, right, upper and lower, etc., mentioned herein are defined with reference to the accompanying drawings of the corresponding specification, and the use of the terms of orientation is only for convenience of description of the technical solution, and it should be understood that the use of the terms of orientation does not constitute a limitation of the scope of protection.

Referring to fig. 2 and 3, fig. 2 is a perspective view of a pipe connection device provided by the present invention, and fig. 3 is a sectional view of the pipe connection device provided by the present invention.

Pipeline connecting device includes first takeover 101, second takeover 102, nut 1, connector 2, and first takeover 101 is connected with connector 2 adoption welded fastening's mode, and connector 2 is provided with external screw thread 202, and the internal perisporium of nut 1 sets up screw thread portion 40, and screw thread portion 40 is used for cooperating in order to realize fixedly with the external screw thread 202 of the outside setting of connector 2. The main body part of the nut 1 is provided with a through hole part 60 for the second connecting pipe 102 to be inserted from a channel formed by the through hole part 60, the inner peripheral wall of the nut 1 is further provided with an inner conical surface part 50, correspondingly, one end part of the second connecting pipe 102 is provided with an expanding part 1021, the connector 2 is provided with an outer conical surface part 201, when the nut 1 is matched with the connector 2, the inner conical surface part 50 and the outer conical surface part 201 can be matched with the expanding part 1021 of the second connecting pipe, and at least part of the expanding part 1021 is clamped between the inner conical surface part 50 and the outer conical surface part 201. Specifically, the second adapter tube 102 may be inserted into the channel formed by the through hole portion 60, then one end of the second adapter tube 102 is flared to form a flared portion 1021, and then the nut 1 is tightened to tightly connect the nut and the connector, so that the flared portion 1021 and the tapered portion 50 are tightly attached to prevent the second adapter tube from being separated from the pipe connection device, thereby achieving the fixed connection between the first adapter tube 101 and the second adapter tube 102.

It should be noted that the present invention is mainly directed to the improvement of the external structure of the nut 1 to achieve the purpose that the pipeline connecting device cannot be easily disassembled, and the above description of the internal structure of the pipeline connecting device is only for facilitating the understanding of the technical solutions by those skilled in the art, and does not constitute a limitation to the internal structure of the pipeline connecting device. Various adaptations and equivalent substitutions of the internal structure of the pipe coupling device may be made by those skilled in the art without departing from the spirit of the invention.

Referring to fig. 4-7, fig. 4 is a schematic structural view of a nut of the first embodiment, fig. 5 is a sectional view of the nut of the first embodiment, fig. 6 is a front view of the nut of the first embodiment, and fig. 7 is a view a-a of fig. 6.

The outer peripheral wall of the nut is provided with a first end portion 3, the first end portion 3 being substantially cylindrical, the surface of which forms a first surface 30, the first end portion 3 having an outer diameter D1. A body portion 4 extends in the axial direction of the first end portion 3, and the body portion 4 is used for tightening a nut with a tool such as a wrench. The overall profile of the main body portion 4 is substantially frustum-shaped, and a plurality of first frustum surfaces 10 are distributed on the outer peripheral surface thereof, and the first frustum surfaces 10 substantially define a virtual frustum surface, that is, the edge lines of any cross section of the plurality of first frustum surfaces 10 are located on the same circle, as shown in fig. 6. Wherein, the outer diameter of the first frustum surface 10 gradually decreases towards the side far away from the first end 3, that is, the outer diameter of the first frustum surface 10 adjacent to the first end 3 at a position a is larger than the outer diameter of the first frustum surface 10 far away from the first end 3 at a side B, and if the outer diameter of any position of the first frustum surface 10 is D2, the following requirements are met: d1 is more than or equal to D2. If the outer diameter of the first conical surface 10 is larger at any point than the outer diameter of the first end portion 3, the wrench may touch or abut against a fulcrum formed between the second side line 22 and the first end portion 3 when the nut is screwed in the counterclockwise direction, so that the nut is unscrewed.

The nut 1 further has a second end portion 5, the second end portion 5 being located at the other end of the body portion 4, i.e. the first end portion 3 and the second end portion 5 are located on both sides of the body portion 4, respectively.

The outer edge of the main body 4 except the first conical surface 10 is recessed toward the direction of the central axis S, and forms at least one pair of operation parts 20 symmetrically distributed with respect to the central axis S, the first end of the operation part 20 intersects the first conical surface 10 along the clockwise direction shown in fig. 3 to form a first side line 26, the outer diameter of at least one section of the operation part 20 gradually decreases along the counterclockwise direction shown in fig. 3, so that a certain height difference is formed with another adjacent conical surface 10, a convex surface 21 is formed between the two, and the convex surface 21 intersects the first conical surface at a second side line 22 and intersects the operation part 20 at a third side line 23.

In the present embodiment, the operation portion 20 includes the clip portion 25, and specifically, the surface of the clip portion 25 is planar and constitutes a part of the surface of the operation portion 20. The clamping portion 25 with a plane is beneficial to clamping by using tools such as a wrench and the like to operate and tighten the nut, in the embodiment, the number of the clamping portions 25 is 4, the clamping portions are divided into 2 pairs, and the surfaces of each pair of the clamping portions 25 are parallel to each other, so that the clamping by the wrench is beneficial.

In any cross section of the operating portion 20, the surface of the operating portion 20 is in an increasing state in the direction in which the nut is tightened (i.e., in the clockwise direction) from the nut center axis S. Referring to fig. 7, fig. 7 is a schematic cross-sectional view of one of the cross sections a-a, taking one of the tapered table surfaces 10 as an example, taking any plane perpendicular to the central axis of the nut to cut the operating portion 20, where a point C is an intersection of the contour CD and the third side line 23, and is equivalent to the second end of the operating portion, a point D is an intersection of the contour CD and the first side line 26, and is equivalent to the first end of the operating portion, and if a distance from the point C to the central axis S of the nut is Rc, and a distance from the point D to the central axis S of the nut is Rd, the following requirements are satisfied: rc < Rd. Taking any two points E, F on the contour line CD, as shown in fig. 7, point E is close to point C, point F is close to point D, the distance from point E to the central axis S of the nut is Re, and the distance from point F to the central axis of the nut is Rf, then the following is satisfied: rc < Re < Rf < Rd. Like this, when using spanner centre gripping clamping part 25 to rotate along clockwise, when screwing up nut 1, the clamping distance grow gradually for the nut is driven the rotation by the spanner easily, with the purpose that the realization is pressed from both sides tightly. On the contrary, when the clamping portion 25 is clamped by a wrench and rotated in the counterclockwise direction, the clamping distance is gradually reduced, so that the wrench slides out along the circumferential direction of the surface of the operation portion 20, that is, the nut cannot be loosened by the wrench.

In a specific embodiment, the surface of the operating portion 20 except the clamping portion 25 is flat, and the rest is a curved portion 24. In this embodiment, the surface of the curved surface portion 24 is a cylindrical surface, and the curved surface portion 24 of the cylindrical surface is convenient for forging and forming. The curved surface portion 24 intersects the surface of the clamping portion 25 at an intersection line 27.

As shown in fig. 4 and 6, the boss surface 21 is gradually inclined in the counterclockwise direction shown in fig. 4, that is, on an imaginary plane, an extension line of the first side line 22 forms an included angle α with a projection of the central axis on the imaginary plane. Thus, if the clamping portion 25 is clamped by a wrench to rotate counterclockwise, the wrench can slide out along the circumferential direction of the surface of the operating portion 20 and also slide out along the axial direction of the second sideline 22, so that the wrench cannot effectively loosen the nut, and the nut cannot be easily disassembled by using tools such as the wrench.

Referring to fig. 8, fig. 8 is a schematic view of a nut structure according to a second embodiment. For convenience of explanation of differences between the present embodiment and the first embodiment, the same reference numerals are used for parts having the same structure and function in both examples.

The outer peripheral wall of the nut is provided with a first end portion 3, the first end portion 3 being substantially cylindrical, the surface of which forms a first surface 30, the end portion 3 having an outer diameter D1. The nut 1 further has a second end portion 5, the second end portion 5 being located at the other end of the body portion 4, i.e. the first end portion 3 and the second end portion 5 are located on both sides of the body portion 4, respectively. The body portion 4 can be used for tightening a nut with a tool such as a wrench. The overall profile of the main body part 4 is approximately frustum-shaped, and a plurality of first frustum surfaces 10 are distributed on the outer peripheral surface of the main body part, and the first frustum surfaces 10 approximately define a virtual frustum surface, i.e. the edge lines of any cross section of the plurality of first frustum surfaces 10 are all located on the same circle. Wherein, the outer diameter of the first frustum surface 10 gradually decreases towards the side far away from the first end 3, that is, the outer diameter of the first frustum surface 10 adjacent to the first end 3 at a position a is larger than the outer diameter of the first frustum surface 10 far away from the first end 3 at a side B, and if the outer diameter of any position of the first frustum surface 10 is D2, the following requirements are met: d1 is more than or equal to D2. If the outer diameter of the first conical surface 10 is larger at any point than the outer diameter of the first end portion 3, the wrench may touch or abut against a fulcrum formed between the first sideline 22 and the first end portion 3 when the nut is screwed in the counterclockwise direction, so that the nut is unscrewed.

The outer edge of the main body 4 except the first conical surface 10 is recessed toward the direction of the central axis S, and forms at least one pair of operation parts 201 symmetrically distributed with respect to the central axis S, the outer surface of the operation part 201 intersects the first conical surface 10 in the clockwise direction shown in fig. 8 to form a first side line 26, the outer diameter of at least one section of the operation part 201 gradually decreases in the counterclockwise direction shown in fig. 3, so that a certain height difference is formed with another adjacent conical surface 10, a convex surface 21 is formed between the two, and the convex surface 21 intersects the first conical surface at a second side line 22 and intersects the operation part 201 at a third side line 23.

In the present embodiment, the operation portion 201 has a surface 241 having a curved surface as a whole, and the surface of the operation portion 201 is in an increasing state in a direction along which the nut is tightened (i.e., in a clockwise direction) in any cross section of the operation portion 201 from the nut center axis S. Of course, the operation portion may be provided in a flat state at a portion closer to the right side in the figure, that is, the first end of the operation portion may be in a flat state and the second end may be in a curved state. The surface of the operation part in a plane state is beneficial to clamping the tool, and the smooth transition curved surface is beneficial to facilitating the tool to slide out along the curved surface when the tool rotates anticlockwise after being clamped. Like this, when using spanner centre gripping operation portion 201 to rotate along clockwise, when screwing up nut 1, the clamping distance grow gradually for the nut is easily driven by the spanner and is rotated, in order to realize pressing from both sides tight purpose. On the contrary, when the operation portion 201 is clamped by the wrench and rotated in the counterclockwise direction, the wrench may slide out along the circumferential direction of the surface of the operation portion 201 due to the gradually decreasing clamping distance, that is, the nut cannot be loosened by the wrench. Similar to the first embodiment, the boss surface 21 may also be disposed to be gradually inclined along the counterclockwise direction, so that when the operation portion 201 is clamped by the wrench to rotate counterclockwise, the wrench may slide out along the circumferential direction of the surface of the operation portion 201 and also slide out along the axial direction of the second sideline 22, and further the wrench may not be able to effectively unscrew the nut, so as to achieve the purpose that the nut cannot be simply disassembled by using tools such as the wrench.

Referring to fig. 9, fig. 9 is a schematic structural diagram of a nut according to a third embodiment of the present invention. The present embodiment is different from the first embodiment in that the operation portion 202 includes the clamping portion 252 and the curved portion 242, wherein the surface of the curved portion 242 does not directly intersect with the surface of the clamping portion 252, but has a certain height difference, that is, the outer diameter of any one of the curved portions 242 is smaller than the outer diameter of the clamping portion 252, so that the step portion 212 is formed therebetween. The number of the operation portions 202 is 4, and two pairs of the operation portions 202 are provided, and each pair of the operation portions 202 is symmetrically provided on the outer peripheral wall of the main body portion 4. Also, such a structure satisfies: the distance from the surface of the operating part 201 to the central axis S of the nut is increased along the direction of screwing the nut (namely, clockwise), and when the nut is screwed, the clamping distance is gradually increased, so that the nut is easily driven by a wrench to rotate, and the purpose of clamping is achieved. On the other hand, when the operation portion 202 is held by the wrench and rotated in the counterclockwise direction, the wrench may slip out along the circumferential direction of the surface of the operation portion 202 due to the gradually decreasing clamping distance, that is, the nut cannot be loosened by the wrench.

Referring to fig. 10, fig. 10 is a schematic view of a nut structure according to a fourth embodiment of the present invention. The difference between this embodiment and the third embodiment is that the number of the operation portions 202 is 2, and the operation portions are symmetrically distributed on the outer peripheral wall of the main body portion 4, and the rest of the structure can be understood with reference to the third embodiment.

The ordinal numbers such as "first", "second", etc., used in the specification of the invention are only for distinguishing between different elements and not for indicating a particular sequential relationship between the elements. The "plane" in this specification is flat relative to a curved surface, and is not required to be an absolute plane.

The valve device provided by the present invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims

1. The pipeline connecting device comprises a first connecting pipe, a second connecting pipe, a nut and a connector, wherein the first connecting pipe is fixedly connected with the connector, the connector is in threaded connection with the nut, the connector, the nut and the second connecting pipe are limited and fixedly connected, the pipeline connecting device is characterized in that the nut comprises a main body part, more than two first frustum surfaces are arranged on the peripheral surface of the main body part, an operating part which is sunken towards the central axis direction of the nut is arranged between the first frustum surfaces, the first end of the operating part and the first frustum surfaces are intersected on a first side line, at least one section of outer diameter of the second end of the operating part is gradually reduced and forms a convex table surface with the adjacent first frustum surfaces, the convex table surface and the first frustum surfaces are intersected on a second side line, and the convex table surface and the operating part are intersected on a third side line, in any cross section located at the operating portion, a distance between a surface of the operating portion and a central axis of the nut is increased in a direction along the first end.

2. The line coupling apparatus of claim 1, wherein the nut includes a first end portion and a second end portion, the first end portion being positioned on one side of the body portion and the second end portion being positioned on the other side of the body portion, the first end portion having an outer diameter (D1) that is greater than or equal to an outer diameter (D2) of the first frustoconical surface at either location.

3. Pipeline connecting device according to claim 1, characterised in that the extension of the first borderline forms an angle (α) with the projection of the centre axis of the nut onto a plane, the cam plane being gradually inclined in the counter-clockwise direction in which the nut is unscrewed.

4. The line connecting device according to any one of claims 1 to 3, wherein the operating portion comprises a clamping portion and a curved portion, the surfaces of the clamping portion are flat, the number of the clamping portions is 1 or more, and the surfaces of each pair of the clamping portions are parallel to each other.

5. The line connection apparatus of claim 4, wherein the surface of the curved surface portion is a cylindrical surface, and the cylindrical surface intersects the surface of the clamping portion at an intersection line, and the outer diameter of the curved surface portion on a side adjacent to the boss surface is smaller than the outer diameter of the first conical boss surface.

6. A pipe coupling according to any one of claims 1-3, wherein said handle portion has an overall curved surface, and wherein the distance between said handle portion surface and the central axis of said nut is increased in any cross-section of said handle portion in a direction along said first end.

7. A line connection according to any of claims 1-3, wherein the surface of the first end of the handle portion is flat and the surface of the second end of the handle portion is flat, the flat and curved surfaces being in smooth transition.

8. The pipe connecting device according to any one of claims 1 to 3, wherein the operating portion includes a clamping portion and a curved surface portion, a height difference exists between a surface of the curved surface portion and a surface of the clamping portion, an outer diameter of any portion of the curved surface portion is smaller than an outer diameter of the clamping portion, and a stepped portion is formed between the curved surface portion and the clamping portion.

9. A line connection apparatus according to any of claims 1-9, wherein the number of said operating portions is 2, and said operating portions are symmetrically distributed on the outer peripheral wall of said main body portion.