CN215111084U

CN215111084U - Nut for pipe joint, pipe joint and gas pipeline system

Info

Publication number: CN215111084U
Application number: CN202120933377.8U
Authority: CN
Inventors: 杨福源; 邓欣涛; 王天泽; 欧阳明高
Original assignee: Tsinghua University
Current assignee: Tsinghua University
Priority date: 2021-04-30
Filing date: 2021-04-30
Publication date: 2021-12-10
Anticipated expiration: 2031-04-30

Abstract

The utility model relates to a nut, coupling and gas piping system for coupling. The nut comprises a nut main body and a sensing unit; the nut main body is provided with a gas collecting chamber which is communicated with a pipe cavity of the nut main body; the sensing unit is arranged in the gas collecting chamber and is used for acquiring and transmitting the gas concentration of the gas collecting chamber. When the threaded connection between the nut main body and the joint main body is loosened but not completely failed or pulled out, the gas in the gas pipeline leaks out through a gap between the nut main body and the gas pipeline (namely a pipe cavity of the nut main body), then flows into a gas collection cavity of the nut, and is detected by the sensing unit. The gas collection cavity can be regarded as a relatively closed small space relative to the external environment, so that the gas concentration in the gas collection cavity can quickly reach the lower limit of the detection concentration of the sensing unit, and the sensitivity and the corresponding speed of gas leakage detection can be greatly improved.

Description

Nut for pipe joint, pipe joint and gas pipeline system

Technical Field

The utility model relates to a gas leakage detects technical field, especially relates to a nut, coupling and gas piping system for coupling.

Background

Energy exhaustion and environmental pollution caused by fossil energy consumption are becoming serious, and large-scale development and utilization of renewable energy are imperative. Although renewable energy resources are abundant and widely distributed, the renewable energy resources fluctuate violently and are periodically influenced by natural environments. The hydrogen is used as an effective energy storage carrier, can store chemical energy converted from renewable energy sources during the power generation peak period, and converts the chemical energy carried by the hydrogen into electric energy again for use through the fuel cell during the power utilization peak period. Among them, hydrogen is a very flammable and explosive gas, and when the volume fraction of hydrogen in air exceeds 4% and is less than 75%, it may cause combustion or explosion upon encountering a fire source, hot spots, static electricity, or the like. At present, in order to ensure the tightness of hydrogen gas during transportation and storage of hydrogen gas, a ferrule type pipe joint is generally adopted to enable a hydrogen gas conveying gas pipeline to be adjacent to other gas pipelines or equipment. However, when the screw connection at the joint is loosened but not completely failed or pulled out, a trace amount of hydrogen is released, and there is also a risk of combustion or explosion.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is necessary to provide a nut for a pipe joint, and a gas piping system, which are used for the pipe joint, in order to solve the technical problem that there is a risk of combustion or explosion when the threaded connection at the ferrule type pipe joint is loosened but not completely failed or pulled out.

A nut for a pipe coupling, the nut comprising: the nut body and the sensing unit;

the nut main body is provided with a gas collecting chamber which is communicated with a pipe cavity of the nut main body;

the sensing unit is arranged in the gas collecting chamber and used for acquiring and sending the gas concentration of the gas collecting chamber.

In one embodiment, the nut body is provided with a mounting shell, and an inner cavity of the mounting shell forms the air collecting chamber.

In one embodiment, the nut body and the mounting shell each comprise a first end and a second end which are distributed oppositely;

the first end of the mounting shell is sleeved on the second end of the nut main body, the second end of the mounting shell extends along the direction far away from the first end of the nut main body, and the second end of the mounting shell is provided with a mounting hole for the gas pipeline to penetrate through.

In one embodiment, the second end of the mounting housing is a clearance fit with the gas line.

In one embodiment, the mounting housing is made of plastic and is integrated with the nut body by means of an injection molding insert.

In one embodiment, the air collecting chamber is opened on the side wall of the nut main body, and the nut main body is further provided with an air passage which is communicated with the air collecting chamber and the tube cavity of the nut main body.

In one embodiment, the air passages are distributed along the radial direction of the nut body.

In one embodiment, the nut further comprises: the gland is used for pressing the sensing unit in the gas collection chamber.

The nut for the pipe joint can be applied to the pipe joint needing nut fastening, such as a CT threaded joint, a pipe threaded joint, a ferrule type pipe joint and the like, when the threaded connection between the nut main body and the joint main body is loosened but not completely failed or pulled out, gas in the gas pipeline leaks out through a gap between the nut main body and the gas pipeline (namely a pipe cavity of the nut main body), then flows into a gas collection cavity of the nut, and is further detected by the sensing unit. The gas collection cavity can be regarded as a relatively closed small space relative to the external environment, so that the gas concentration in the gas collection cavity can quickly reach the lower limit of the detection concentration of the sensing unit, and the sensitivity and the corresponding speed of gas leakage detection can be greatly improved.

A pipe joint comprising a joint body and the nut for a pipe joint of any one of the above;

the nut main body of the nut is sleeved on the joint main body.

When the threaded connection between the nut body and the joint body is loosened but not completely failed or pulled out, the gas in the gas pipeline leaks out through the gap between the nut body and the gas pipeline (i.e., the tube cavity of the nut body), and then flows into the gas collection chamber of the nut, and is detected by the sensing unit. The gas collection cavity can be regarded as a relatively closed small space relative to the external environment, so that the gas concentration in the gas collection cavity can quickly reach the lower limit of the detection concentration of the sensing unit, and the sensitivity and the corresponding speed of gas leakage detection can be greatly improved.

A gas line system, comprising: a gas line and a pipe joint as defined in any of the above.

When the threaded connection between the nut body and the joint body is loosened but not completely failed or pulled out, the gas in the gas pipeline leaks out through a gap between the nut body and the gas pipeline (namely, a pipe cavity of the nut body), then flows into a gas collection cavity of the nut, and is detected by the sensing unit. The gas collection cavity can be regarded as a relatively closed small space relative to the external environment, so that the gas concentration in the gas collection cavity can quickly reach the lower limit of the detection concentration of the sensing unit, and the sensitivity and the corresponding speed of gas leakage detection can be greatly improved.

Drawings

Fig. 1 is a schematic structural view of a nut for a ferrule-type pipe joint according to an embodiment of the present invention;

fig. 2 is a schematic cross-sectional view of a gas pipeline system according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a gas pipeline system according to an embodiment of the present invention;

fig. 4 is a schematic structural view of a nut for a ferrule-type pipe joint according to another embodiment of the present invention;

fig. 5 is a schematic cross-sectional view of a gas pipeline system according to another embodiment of the present invention;

fig. 6 is an exploded view of a nut according to another embodiment of the present invention.

Wherein the reference numerals in the accessories are explained as follows:

100. a nut; 110. a nut body; 110a, a lumen; 110b, an air passage; 120. a gas collection chamber; 130. a sensing unit; 140. installing a shell; 150. a gland; 200. a connector body; 300. a gas pipeline.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

An embodiment of the present invention provides a nut 100 for a pipe joint, as shown in fig. 1 to 6, the nut 100 including: the nut body 110 and the sensing unit 130; the nut main body 110 is provided with a gas collection chamber 120, and the gas collection chamber 120 is communicated with the pipe cavity 110a of the nut main body 110; the sensing unit 130 is disposed in the gas collecting chamber 120 and is used to acquire and transmit the gas concentration of the gas collecting chamber 120.

The pipe joint is used for connecting a gas pipeline and can be a CT threaded joint, a pipe threaded joint, a clamping sleeve type pipe joint and other threaded joints. The structure and the installation of the gas leak detection device will be described below by taking the ferrule type pipe joint as an example. As shown in fig. 3 and 5, the ferrule tube fitting includes: a fitting body 200, a nut body 110, and a ferrule; when the ferrule and the nut body 110 are sleeved on the gas pipeline 300 and inserted into the joint body 200, and the nut body 110 is screwed, the outer side of the front end of the ferrule is attached to the conical surface of the joint body 200, and the inner edge is uniformly bitten into the gas pipeline 300 to form effective sealing. Compared with other types of pipe joints, the ferrule type pipe joint has the advantages of firm connection, good sealing performance and the like, and is widely applied to the fields of gas transportation and storage, such as hydrogen. However, when the nut body 110 is loosened, the outer side of the front end of the ferrule no longer abuts against the tapered surface of the connector body 200, and gas (e.g., hydrogen) in the gas pipeline 300 leaks from the gap between the ferrule and the tapered surface of the connector body 200 to the gap between the nut body 110 and the gas pipeline 300 (i.e., the lumen 110a of the nut body 110).

As an example, the sensing unit 130 includes: the peripheral circuit board and the gas sensitive element integrated on the peripheral circuit board. When the gas sensitive element detects that the gas concentration reaches a set value, a voltage signal can be generated, and the voltage signal is received by external acquisition equipment to give an alarm.

The nut 100 for a pipe joint as described above can be applied to a pipe joint requiring nut fastening, such as a CT threaded joint, a pipe threaded joint, a ferrule type pipe joint, etc., when the threaded connection between the nut body 110 and the joint body 200 is loosened but not yet completely failed or pulled out, the gas in the gas pipeline 300 leaks out through the gap between the nut body 110 and the gas pipeline 300 (i.e., the pipe cavity 110a of the nut body 110), and then flows into the gas collection chamber 120 of the nut 100, and is detected by the sensing unit 130. Since the gas collection chamber 120 can be regarded as a relatively closed small space with respect to the external environment, the gas concentration in the gas collection chamber 120 can quickly reach the lower detection concentration limit of the sensing unit 130, so that the sensitivity and corresponding speed of gas leakage detection can be greatly improved.

As for the formation of the gas collecting chamber 120, two examples are given as follows:

example (1)

As shown in fig. 1 to 3, the nut body 110 is provided with a mounting case 140, and an inner cavity of the mounting case 140 constitutes the gas collection chamber 120. The nut body 110 may have the same structure as the nut 100 of the conventional ferrule type tube fitting, so that the housing 140 may be directly machined and mounted on the nut 100 of the conventional ferrule type tube fitting.

Further, as shown in fig. 1 to 3, the nut body 110 and the mounting shell 140 each include a first end and a second end that are distributed oppositely; the first end of the mounting housing 140 is sleeved on the second end of the nut main body 110, the second end of the mounting housing 140 extends along a direction away from the first end of the nut main body 110, and the second end of the mounting housing 140 has a mounting opening for the gas pipeline 300 to pass through. Therefore, the material for installing the shell 140 can be reduced, the volume of the gas collecting chamber 120 can be reduced as much as possible, and the corresponding speed of gas leakage detection is improved.

Alternatively, as shown in FIG. 2, the first end of the mounting housing 140 is a clearance fit with the gas line 300. Therefore, the installation housing 140 can slide on the gas pipeline 300 conveniently, which is beneficial to the installation of the gas pipeline 300. it should be noted that the gap between the installation housing 140 and the gas pipeline 300 is small in size and can be ignored, and the sensitivity of the gas leakage detection of the sensing unit 130 is not affected.

Alternatively, the mounting housing 140 is made of plastic and is formed integrally with the nut body 110 by means of injection molding. Therefore, the connection strength between the mounting shell 140 and the nut body 110 can be improved, the mounting shell 140 is prevented from falling off from the nut body 110, and the normal operation of the sensing unit 130 is ensured. The nut body 110 may be made of metal (e.g., copper, alloy). The sensing unit 130 may be attached in the gas collecting chamber 120 using an insulating adhesive.

Example (2)

As shown in fig. 4 to 6, the gas collecting chamber 120 is opened on a side wall of the nut main body 110, the nut main body 110 further has a gas passage 110b, and the gas passage 110b is communicated with the gas collecting chamber 120 and the pipe cavity 110a of the nut main body 110. The gas leaked from the gas pipe 300 reaches the gap between the nut body 110 and the gas pipe 300 and then enters the gas collecting chamber 120 through the gas passage 110 b. This form of the gas collecting chamber 120 may reduce the volume of the gas collecting chamber 120 and may increase the corresponding speed of gas leak detection.

Alternatively, as shown in fig. 5, the ventilation channels 110b are distributed along the radial direction of the nut body 110. The opening of the air passage 110b is facilitated, and the length of the nut body 110 can be reduced.

Further, in some embodiments of the present invention, as shown in fig. 4 to 6, the nut 100 further includes: and a pressing cover 150, the pressing cover 150 being used to press the sensing unit 130 into the gas collecting chamber 120. The cover 150 may protect the sensing unit 130.

Alternatively, the pressing cover 150 can be fixed on the nut body 110 by screws, so as to facilitate the assembly and disassembly of the sensing unit 130 in the gas collection chamber 120. Illustratively, the gland 150 has screw holes, the wall of the gas collecting chamber 120 close to the gas pipeline 300 has screw holes, and the screws are inserted into the screw holes of the gland 150 and the screw holes of the gas collecting chamber 120 to fix the gland 150. In another example, the gland 150 has screw holes, the wall of the gas collecting chamber 120 close to the gas pipeline 300 has screw posts, and the screws are inserted into the screw holes of the gland 150 and the screw posts of the gas collecting chamber 120 to fix the gland 150.

Alternatively, the gland 150 may be a rectangular plate, a circular plate, or other regular polygonal plate, a profiled plate. Wherein, when the gland 150 is a rectangular plate, each corner of the gland 150 is connected with the nut main body 110 by a screw.

Another embodiment of the present invention provides a pipe joint, which includes a joint main body 200 and any one of the nuts 100 for a pipe joint described above; the nut body 110 of the nut 100 is fitted over the fitting body 200.

As one example, the fitting body 200 may be a two-way or three-way pipe structure.

When the threaded connection between the nut body 110 and the joint body 200 is loosened but not completely failed or pulled out, the gas in the gas pipeline 300 leaks out through the gap between the nut body 110 and the gas pipeline 300 (i.e., the tube cavity 110a of the nut body 110), and then flows into the gas collection chamber 120 of the nut 100, and is detected by the sensing unit 130. Since the gas collection chamber 120 can be regarded as a relatively closed small space with respect to the external environment, the gas concentration in the gas collection chamber 120 can quickly reach the lower detection concentration limit of the sensing unit 130, so that the sensitivity and corresponding speed of gas leakage detection can be greatly improved.

example (1)

Example (2)

The utility model discloses another embodiment provides a gas pipeline system, and this gas pipeline system includes: a gas line 300 and a pipe joint according to any of the above.

In the gas pipeline system, when the threaded connection between the nut body 110 and the connector body 200 is loosened but not completely failed or pulled out, the gas in the gas pipeline 300 leaks out through the gap between the nut body 110 and the gas pipeline 300 (i.e., the tube cavity 110a of the nut body 110), and then flows into the gas collection chamber 120 of the nut 100, and is detected by the sensing unit 130. Since the gas collection chamber 120 can be regarded as a relatively closed small space with respect to the external environment, the gas concentration in the gas collection chamber 120 can quickly reach the lower detection concentration limit of the sensing unit 130, so that the sensitivity and corresponding speed of gas leakage detection can be greatly improved.

example (1)

Example (2)

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. Nut for a pipe joint, characterized in that said nut (100) comprises: a nut body (110) and a sensing unit (130);

the nut main body (110) is provided with a gas collecting chamber (120), and the gas collecting chamber (120) is communicated with a pipe cavity (110a) of the nut main body (110);

the sensing unit (130) is disposed in the gas collecting chamber (120) and is used to acquire and transmit the gas concentration of the gas collecting chamber (120).

2. Nut according to claim 1, characterized in that a mounting housing (140) is provided on the nut body (110), the inner cavity of the mounting housing (140) constituting the gas collection chamber (120).

3. The nut of claim 2 wherein the nut body (110) and the mounting shell (140) each include oppositely disposed first and second ends;

the first end of the mounting shell (140) is sleeved on the second end of the nut main body (110), the second end of the mounting shell (140) extends along the direction far away from the first end of the nut main body (110), and the second end of the mounting shell (140) is provided with a mounting opening for the gas pipeline (300) to penetrate through.

4. The nut according to claim 3, characterized in that the second end of the mounting housing (140) is clearance fitted with the gas line (300).

5. The nut according to any one of claims 2 to 4, characterized in that said mounting housing (140) is made of plastic and is formed integrally with said nut body (110) by means of an injection-molded insert.

6. The nut according to claim 1, characterized in that the air collection chamber (120) is opened on the side wall of the nut main body (110), the nut main body (110) further has an air passage (110b), and the air passage (110b) is communicated with the air collection chamber (120) and the lumen (110a) of the nut main body (110).

7. Nut according to claim 6, characterized in that said ventilation channels (110b) are distributed radially of said nut body (110).

8. The nut of claim 6 or 7, further comprising: a gland (150), the gland (150) for compressing the sensing unit (130) in the gas collection chamber (120).

9. A pipe joint, characterized in that the pipe joint comprises: -a fitting body (200) and a nut (100) for a pipe fitting according to any of claims 1 to 8;

the nut main body (110) of the nut (100) is sleeved on the joint main body (200).

10. A gas line system, comprising: a gas line (300) and a pipe coupling according to any of claims 1-9.