Connector used on flow meter

Abstract

The joint comprises a pipe joint, a flared pipe and a connector, a fluid channel is formed in the pipe joint, the pipe joint is used for being connected with the flared pipe, and the end, connected with the flared pipe, of the pipe joint is provided with a connector and a first connecting part in sequence; the first connecting part and the second connecting part of the connector are detachably connected with each other with a limiting function, and the flared pipe is arranged at the ending position of the second connecting part; the flared pipe comprises a first pipeline and a second pipeline, the first pipeline is arranged at the ending position of the second connecting part, the diameter of the second pipeline is smaller than that of the first pipeline, after the first connecting part and the second connecting part are connected in place, the connector is connected into the first pipeline, and a pipeline in the connector is matched with the second pipeline; a passage for fluid movement is formed between the pipe joint and the flared pipe. According to the flow meter connector, the problem that in the prior art, a flow meter connector structure is complex is solved, and the flow meter connector is simple in structure, easy to disassemble and good in sealing performance.

Description

Technical Field

[0001] The present application relates to the field of flow meters, and in particular to a connector used in a flow meter. Background Art

[0002] Flowmeter is a meter that indicates the measured flow rate and / or the total amount of fluid in a selected time interval. In simple terms, it is a meter used to measure the flow rate of fluid in a pipeline or open channel. Flowmeters are divided into differential pressure flowmeters, rotor flowmeters, throttling flowmeters, slit flowmeters, volumetric flowmeters, electromagnetic flowmeters, ultrasonic flowmeters, etc. Classified by medium: liquid flowmeters and gas flowmeters.

[0003] Figure 1 It is a connection diagram of a flow meter according to the related art, such as Figure 1 As shown, flow meter B is used to measure liquid flow or gas flow. In the following, liquid is used as an example. The liquid enters the flow meter from a pipeline and then flows out of the flow meter from another pipeline. Thus, the flow of the liquid can be controlled by flow meter B. The pipeline is connected to the flow meter through connector A, which is convenient for disassembly of the flow meter. Figure 1 Two joints A are shown in FIG. 1 , wherein one joint is connected to a pipe entering the flow meter, and the other joint is connected to a pipe flowing out of the flow meter.

[0004] In order to achieve easy disassembly and airtightness at the same time, the flow meter in the related art has a relatively complex structure and a relatively high cost. Summary of the invention

[0005] The embodiment of the present application provides a connector for use in a flow meter, so as to at least solve the problem that the connector structure of the flow meter in the related art is relatively complicated.

[0006] According to one aspect of the present application, there is provided a joint for use in a flow meter, comprising: a pipe joint, a flared tube and a connector, wherein the interior of the pipe joint is a fluid channel, the pipe joint is used to connect to the flared tube, and one end of the pipe joint connected to the flared tube is a connector and a first connecting portion in sequence; the first connecting portion and the second connecting portion of the connector are a detachable connection with a limit, and the flared tube is arranged at the position where the second connecting portion ends; the flared tube comprises a first pipe and a second pipe, the first pipe is arranged at the position where the second connecting portion ends, the diameter of the second pipe is smaller than the diameter of the first pipe, and after the first connecting portion and the second connecting portion are connected in place, the connector is connected to the first pipe, and the pipe in the connector cooperates with the second pipe to form a passage for fluid movement between the pipe joint and the flared tube.

[0007] Further, the connector is a nut, and the first connecting part and the second connecting part are both threads; the threads inside the nut are adapted to the threads of the pipe joint, and the flared tube is arranged at the position where the threads inside the nut end; after the threads of the pipe joint and the threads inside the nut are tightened, the connector is connected to the first pipe; a measuring ring is arranged at one end where the pipe joint and the nut are connected, and after the threads of the nut and the pipe joint are tightened, one surface of the measuring ring contacts the end surface of the connection between the nut and the pipe joint; or, the second connecting part of the connector and the first connecting part of the pipe joint are connected by a snap-on connection.

[0008] Further, a component for increasing pressure or friction is provided on the side where the flared tube and / or the connector are in contact with each other; or, a component for increasing pressure or friction is provided on the side where the flared tube and / or the nut are in contact with each other.

[0009] Further, a protrusion is provided on the side of the connecting head that contacts the first pipe of the flared tube; and / or, a protrusion is provided on the side of the first pipe of the flared tube that contacts the connecting head; and / or, a protrusion is provided on the side of the first pipe of the flared tube that contacts the nut; and / or, a protrusion is provided on the side of the nut that contacts the first pipe of the flared tube; wherein the protrusion provided is an elastic protrusion.

[0010] Furthermore, a plurality of mutually engaging annular protrusions are staggeredly arranged at the portion where the connector and the first pipe of the flared pipe contact each other; and / or a plurality of mutually engaging annular protrusions are staggeredly arranged at the portion where the first pipe of the flared pipe and the inner side of the nut meet.

[0011] Furthermore, a chamfer is provided at one end of the connector that is connected to the flared pipe, and an annular protrusion is provided at the chamfer of the connector.

[0012] Furthermore, the end of the first pipe of the flared tube is located in the gap formed by the nut and the connector, and the end of the first pipe does not contact the inner sides of the connector and the nut; the shape of the gap formed by the nut and the connector is adapted to the shape and size of the first pipe, one side of the end of the first pipe contacts the connector, and the other side of the end of the first pipe contacts the inner side of the nut.

[0013] Furthermore, the thread on the pipe joint is used to cooperate with the nut 3, and the connector is used to connect with the flared pipe, and a chamfer is provided at one end of the connector connected to the flared pipe.

[0014] Furthermore, at least one protrusion is provided on the outer cylindrical surface of the nut, and the protrusion protrudes from the outer cylindrical surface of the nut.

[0015] Furthermore, there are multiple protrusions evenly arranged on the outer cylindrical surface of the nut, the cross-section of one end of the protrusion is a regular shape, and the middle part between the two ends of the protrusion is a cube.

[0016] The joint in the embodiment of the present application includes: a pipe joint, a flared tube and a connector, wherein the interior of the pipe joint is a fluid passage, the pipe joint is used to connect with the flared tube, and one end of the pipe joint connected to the flared tube is a connector and a first connecting part in sequence; the first connecting part and the second connecting part of the connector are detachably connected with a limit, and the flared tube is arranged at the position where the second connecting part ends; the flared tube includes a first pipe and a second pipe, the first pipe is arranged at the position where the second connecting part ends, the diameter of the second pipe is smaller than the diameter of the first pipe, and after the first connecting part and the second connecting part are connected in place, the connector is connected to the first pipe, and the pipe in the connector cooperates with the second pipe to form a passage for fluid movement between the pipe joint and the flared tube. The present application solves the problem that the joint structure of the flow meter in the related art is relatively complicated, and the joint structure of the present application is simple, easy to disassemble and has good sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0018] Figure 1 is a connection diagram of a flow meter according to the related art;

[0019] Figure 2 is a schematic diagram of a connector for a flow meter according to an embodiment of the present application;

[0020] Figure 3 is a schematic diagram of a joint with an increased amount ring according to an embodiment of the present application;

[0021] Figure 4 is a schematic diagram of a pipe joint according to an embodiment of the present application;

[0022] Figure 5 is a schematic diagram of a nut according to an embodiment of the present application;

[0023] Figure 6 is a schematic diagram of a pipe joint and a flared pipe connected by a nut according to an embodiment of the present application;

[0024] Figure 7 is a schematic diagram of the principle of component sealing according to an embodiment of the present application;

[0025] Figure 8 is a schematic diagram of a pipe joint and a flared pipe provided with a protrusion according to an embodiment of the present application;

[0026] Fig. 9 It is a schematic diagram of setting a protrusion according to an embodiment of the present application Figure 1 ;

[0027] Fig.10 It is a schematic diagram of setting a protrusion according to an embodiment of the present application Figure 2 ;

[0028] Fig.11 It is a schematic diagram of setting a protrusion according to an embodiment of the present application Figure 3 ;

[0029] Fig.12 It is a schematic diagram of setting a protrusion according to an embodiment of the present application Figure 4 ;

[0030] Fig.13 is a schematic diagram of a measuring ring according to an embodiment of the present application; and,

[0031] Fig.14 It is a schematic diagram of the cooperation between the measuring ring and the nut according to an embodiment of the present application. DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0033] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0034] Figure 2 is a schematic diagram of a connector for a flow meter according to an embodiment of the present application, such as Figure 2As shown, the joint comprises: a pipe joint 1, a flared pipe 2 and a nut 3, wherein the interior of the pipe joint 1 is a fluid passage, the pipe joint 1 is used to connect with the flared pipe 2, and one end of the pipe joint 1 connected with the flared pipe 2 is a connector and a thread in sequence (in an optional embodiment, the diameter of the connector is smaller than the diameter of the annular surface on which the thread is set); the thread inside the nut 3 is adapted to the thread of the pipe joint, and the flared pipe 2 is arranged at the position where the thread ends inside the nut 3; the flared pipe 2 comprises a first pipe and a second pipe, the first pipe is arranged at the position where the thread ends (in an optional embodiment, the diameter of the first pipe is the same as the diameter of the annular surface on which the thread is set inside the nut 3), the diameter of the second pipe is smaller than the diameter of the first pipe, and after the thread of the pipe joint 1 is tightened with the thread inside the nut 3, the connector is connected to the first pipe, and the pipe in the connector cooperates with the second pipe to form a passage for fluid movement between the pipe joint 1 and the flared pipe 2. The pipe joint may be a male thread, and the thread inside the nut may be a female thread; or the pipe joint may be a female thread, and the thread inside the nut may be a male thread.

[0035] It should be noted that the reason why it is called a flared tube is because the diameters of the two ends of the tube are different.

[0036] exist Figure 2 In the joint shown, the pipe joint 1 and the flared pipe 2 are connected by the cooperation between the threads, so that the purpose of detachability can be achieved, and the cooperation between the flared pipe 2 and the threads can also achieve the purpose of easy installation and prevention of fluid leakage.

[0037] It should be noted that the nut can also be a connector in other forms, for example, a bead-shaped press-fit joint, and the second connection part of the connector and the first connection part of the pipe joint are connected by a press-fit connection. Therefore, as long as a detachable limit connection is achieved, it will be sufficient. That is, the interior of the pipe joint is a fluid channel, the pipe joint is used to connect with the flared pipe, and one end of the pipe joint connected to the flared pipe is a connector and a first connection part in sequence; the first connection part and the second connection part of the connector are a detachable connection with a limit, and the flared pipe is arranged at the end position of the second connection part; the flared pipe includes a first pipe and a second pipe, the first pipe is arranged at the end position of the second connection part, the diameter of the second pipe is smaller than the diameter of the first pipe, and after the first connection part and the second connection part are connected in place, the connector is connected to the first pipe, and the pipe in the connector cooperates with the second pipe to form a passage for fluid movement between the pipe joint and the flared pipe.

[0038] As an embodiment, after adding a measuring ring, the measuring ring is set at one end where the pipe joint is connected to the connector. After the connection with the pipe joint is in place, one surface of the measuring ring contacts the end surface of the connection between the connector and the pipe joint; the measuring ring is made of elastic material.

[0039] Corresponds to Figure 2 , the connector is a nut, the first connection part and the second connection part are both threads; the threads inside the nut are adapted to the threads of the pipe joint, and the flared tube is arranged at the position where the threads inside the nut end; after the threads of the pipe joint and the threads inside the nut are tightened, the connector is connected to the first pipe. As an embodiment, after adding a measuring ring, the measuring ring is arranged at one end where the pipe joint is connected to the nut, and after the threads of the nut and the pipe joint are tightened, one surface of the measuring ring contacts the end surface of the connection between the nut and the pipe joint. In the following embodiments, the connector is a nut as an example for description.

[0040] Figure 6 Schematic diagram of a pipe joint and a flared pipe connected by a nut according to an embodiment of the present application, Figure 6 As shown, the connecting head of the pipe joint 1 and the inner side of the first pipe of the flared pipe 2 are pressed into contact by the pressure generated by the cooperation between the threads, and the outer side of the first pipe of the flared pipe 2 and the inner side of the nut are pressed into contact by the pressure generated by the cooperation between the threads.

[0041] In order to ensure tight internal contact between the flared tube 2, the connector and the nut, a component for increasing pressure or friction may be provided on the side where the flared tube and / or the connector are in contact with each other, or a component for increasing pressure or friction may be provided on the side where the flared tube and / or the nut are in contact with each other.

[0042] Figure 7 Schematic diagram of the principle of component sealing according to an embodiment of the present application, such as Figure 7 As shown, the two parts have through holes along the axial direction, which are engaged by threads. The male head has an insertion hole along the axial direction, and the pipe member is inserted into the surface of the annular protrusion on the axial extension of the male and female heads through the hole. The pipe member with an enlarged diameter is clamped between the inner circumferential surfaces of the male and female heads. Figure 7 In the process, annular protrusions can be set at three sealing locations to increase pressure and thus make the seal better. The three sealing locations are Figure 7 Seal 1, seal 2 and seal 3 shown in Figure 7 , A11, A12 and A13 represent seal 1, seal 2 and seal 3 respectively, and P1 and P2 represent the applied pressing forces respectively.

[0043] based on Figure 7According to the principle shown in , a protrusion can be set on the side of the connector that contacts the first pipe of the flared pipe; and / or, a protrusion can be set on the side of the first pipe of the flared pipe that contacts the connector; and / or, a protrusion can be set on the side of the first pipe of the flared pipe that contacts the nut; and / or, a protrusion can be set on the side of the nut that contacts the first pipe of the flared pipe; wherein the protrusion is an elastic protrusion. It should be noted that these four ways of setting the protrusion can be used alone or at least two of them can be selected and used in combination.

[0044] Figure 8 Schematic diagram of a pipe joint and a flared pipe provided with a protrusion according to an embodiment of the present application, Figure 8 As shown, an annular protrusion is provided on the connecting head of the pipe joint, and in particular, an annular protrusion A14 is also provided at the chamfer of the connecting head.

[0045] Several optional ways of setting the protrusions are described below with reference to several examples.

[0046] Fig. 9 It is a schematic diagram of setting a protrusion according to an embodiment of the present application Figure 1 ,like Fig. 9 As shown, a plurality of mutually engaging annular protrusions are staggeredly arranged at the portion where the connector and the first pipe of the flared tube contact; an annular protrusion is arranged at the chamfer of the connector; and an annular protrusion is arranged on the surface where the nut contacts the first pipe. Fig.10 It is a schematic diagram of setting a protrusion according to an embodiment of the present application Figure 2 ,exist Fig.10 The way to set the bulge in Fig. 9 The same, but different, in Fig. 9 In the embodiment, the end of the first pipe of the flared pipe is located in the gap formed by the nut and the connector, and the end of the first pipe does not contact the inner sides of the connector and the nut; Fig.10 In the embodiment, the shape of the gap formed by the nut and the connector is adapted to the shape and size of the first pipe, one side of the end of the first pipe contacts the connector, and the other side of the end of the first pipe contacts the inner side of the nut.

[0047] Fig.11 It is a schematic diagram of setting a protrusion according to an embodiment of the present application Figure 3 ,like Fig.11As shown, an annular protrusion is provided on the connector, or an annular protrusion is provided on the first pipe of the flared pipe, wherein the position where the annular protrusion is provided is the contact surface between the connector and the first pipe; an annular protrusion is provided on the inner side of the nut on the surface in contact with the first pipe, wherein the annular protrusions are provided at two locations, one of the two locations is provided with an annular protrusion, and the other of the two locations is provided with multiple annular protrusions.

[0048] Fig.12 It is a schematic diagram of setting a protrusion according to an embodiment of the present application Figure 4 , Fig.12 and Fig.11 Similar, but different, the cross section of the annular protrusion is triangular, Figures 9 to 11 The cross section of the annular protrusion is semicircular. Fig.12 In the embodiment, an annular protrusion is provided on the inner side of the nut on the surface in contact with the first pipe.

[0049] Since the connection between the flared pipe 2 and the pipe joint 1 is through a thread, it is best to determine the position of the nut 3 when tightening the nut 3, so as to avoid possible damage to the pipe joint 1 caused by over-tightening the nut 3. In order to solve this problem, in an optional embodiment, a retaining ring can be added to limit the position of the nut 3. The retaining ring can be simply referred to as a ring or a measuring ring 4. In the following embodiments, the retaining ring is referred to as a measuring ring 4. Figure 3 is a schematic diagram of a joint of an increase amount ring 4 according to an embodiment of the present application, such as Figure 3 As shown, the interface may further include a measuring ring 4, which is arranged at one end where the pipe joint 1 is connected to the nut 3. After the threads of the nut 3 and the pipe joint 1 are tightened, one surface of the measuring ring 4 contacts the end surface of the connection between the nut 3 and the pipe joint 1.

[0050] Figure 3 The measuring ring 4 shown includes a first end and a second end, the first end is an end installed relative to the pipe joint, the pipe joint 1 is provided with a blocking portion, the blocking portion is used to prevent the first end from moving in a direction away from the connecting head, and the second end is tubular, and the diameter of the tubular shape of the second end is adapted to the diameter of one end of the nut 3, so that one end of the nut 3 can tightly enter the tubular second end.

[0051] The measuring ring 4 is made of elastic material.

[0052] Fig.13 is a schematic diagram of a measuring ring according to an embodiment of the present application, such as Fig.13As shown, the two clearances A15 at the measuring ring feature make the measuring ring more likely to deform, vibrate and make sounds during the collision between the locking member and the measuring ring. That is, at least one clearance is provided at the first end of the measuring ring.

[0053] Fig.14 is a schematic diagram of the cooperation between the measuring ring and the nut according to an embodiment of the present application, such as Fig.14 As shown, the second end of the measuring ring is provided with a protrusion, and the nut is provided with a protrusion. In the process of tightening the nut, the protrusion and the second end of the measuring ring are rubbed against each other, thereby making a sound. The protrusion can be evenly arranged on the outer cylindrical surface of the nut, and the cross-section of one end of the protrusion is semicircular. The measuring ring and the pipe joint are interference-pressed through the lower radial protrusion on the measuring ring and the depression at the pipe joint, thereby limiting the rotational movement of the measuring ring in the axial direction. The locking member and the pipe joint are engaged with each other through threads. When the locking member reaches the predetermined position, the radially distributed ribs on the outer surface of the locking member interact with the protrusion on the upper surface of the measuring ring. When the measuring ring resists the rotation of the locking member, due to its own thin-walled characteristics, it will issue a periodic alarm sound to prompt the user that the predetermined position has been reached. Among them, Fig.14 A16 in the figure indicates detail 1, and A17 indicates the point where the measuring ring and the locking piece interact.

[0054] In order to better connect the pipe joint 1 to the expanded pipe 2 , a chamfer may be provided on the pipe joint 1 . Figure 4 is a schematic diagram of a pipe joint 1 according to an embodiment of the present application, such as Figure 4 As shown, the thread 11 is used to cooperate with the nut 3, and the connector 12 is used to connect with the flared pipe 2. A chamfer 121 is provided at one end of the connector connected to the flared pipe 2, and the chamfer 121 plays a guiding role.

[0055] pass Figure 3 When the joint provided with the measuring ring 4 is used, the pipe joint 1 is first combined with the flared pipe 2, and the chamfer of the pipe joint 1 plays a guiding role, and then combined with the nut 3. The contact surface contains threads, and the threads play a displacement role, a sealing role, and a fastening role. When the nut 3 is turned, when the nut 3 moves axially toward the measuring tube, the measuring ring 4 does not rotate, and the flared pipe 2 and the pipe joint 1 are more tightly combined, so that the sealing performance is better. When the nut 3 touches the measuring ring 4, a sound is made due to the thin wall vibration principle, and the connection between the nut 3 and the pipe joint 1 is completed.

[0056] A flow path for fluid flow is formed inside the joint, realizing a passage between the flow controller and the water pipe, so as to smoothly transmit the fluid and have good water tightness.

[0057] Figure 5 is a schematic diagram of a nut according to an embodiment of the present application, such as Figure 5As shown, in order to facilitate the user to screw the nut, at least one protrusion may be provided on the outer cylindrical surface of the nut, and the protrusion protrudes from the outer cylindrical surface of the nut.

[0058] Multiple protrusions can be provided, evenly arranged on the outer cylindrical surface of the nut, the cross-section of one end of the protrusion is semicircular or can also be other regular shapes, such as rectangle, triangle, etc., the other end of the protrusion is a slope (or it may not be a slope, a plane is also acceptable), and the middle part between the two ends of the protrusion is a cube.

[0059] In the above embodiment, a connector is provided, which is a detachable connector in a fluid passage, including a measuring ring, a nut, a flared tube, and a pipe joint component, and the pipe joint and the connecting nut have corresponding male and female threads. The connector is assembled around the plastic shell of the flow controller, and is made of PFA material, PVDF material or PP material (these materials are examples, and are not limited to these materials, and other materials can also be selected), has low density, light weight, corrosion resistance, acid and alkali resistance, moisture resistance, easy disassembly, and good sealing performance.

[0060] PFA material, PVDF material or PP material has excellent chemical corrosion resistance, the lowest friction coefficient among plastics, and good electrical properties. Its electrical insulation is not affected by temperature. PFA material, PVDF material or PP material is suitable for making corrosion-resistant parts, wear-resistant parts, seals, insulating parts and medical device parts.

[0061] In this embodiment, a flow meter may also be provided, which uses the above-mentioned joint to connect a pipeline through which fluid enters the flow meter, and / or uses the above-mentioned joint to connect a pipeline through which fluid flows out of the flow meter.

[0062] The flow meter can be an ultrasonic flow meter, and in the ultrasonic flow meter, it is more suitable to use PFA material, PVDF material or PP material to make the joint. The ultrasonic flow meter may include: a shell, the shell space is divided into two parts; a valve assembly, used to control the flow of liquid into the ultrasonic flow meter; a flow measurement assembly, used to measure the flow rate of the liquid flowing through the flow measurement assembly by ultrasonic waves, wherein the valve assembly is connected to the flow assembly, and the valve assembly and the flow assembly are located in the first part of the two parts; a circuit board, used to control the valve assembly and the flow measurement assembly, wherein the circuit board is located in the second part of the two parts, wherein the circuit board covers the valve assembly and the flow measurement assembly.

[0063] Optionally, the ultrasonic flow meter also includes: a plurality of mounting posts, one end of each mounting post is fixed to the shell, each mounting post is located in the first part, and the other end of each mounting post is used to fix the circuit board, the circuit board and one side of the shell constitute the first part, and the part where the circuit board is located is the second part.

[0064] Optionally, the valve assembly is arranged on one side of the first part, and the flow measurement assembly is arranged on the other side of the first part. In another embodiment, the ultrasonic flow meter may further include: an inlet pipe and an outlet pipe, wherein the inlet pipe is connected to the valve assembly, and the outlet pipe is connected to the flow measurement assembly. The inlet pipe and the outlet pipe can be connected to the channel of the external fluid using the above-mentioned joint.

[0065] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A connector for a flow meter, characterized in that: include: Pipe fittings, flared pipes and connectors, among which, The interior of the pipe joint is a fluid passage, and the pipe joint is used to connect with the flared pipe. One end of the pipe joint connected with the flared pipe is a connector and a first connecting part in sequence; the first connecting part and the second connecting part of the connector are detachably connected with a limit, and the flared pipe is arranged at the position where the second connecting part ends; the flared pipe includes a first pipe and a second pipe, and the first pipe is arranged at the position where the second connecting part ends, and the diameter of the second pipe is smaller than the diameter of the first pipe. After the first connecting part and the second connecting part are connected in place, the connector is connected to the first pipe, and the pipe in the connector cooperates with the second pipe to form a passage for fluid movement between the pipe joint and the flared pipe; The connector is a nut, and both the first connection part and the second connection part are threads; the threads inside the nut are adapted to the threads of the pipe joint, and the flared tube is arranged at the position where the threads inside the nut end; after the threads of the pipe joint and the threads inside the nut are tightened, the connector is connected to the first pipe; a measuring ring is arranged at one end where the pipe joint and the nut are connected, and after the threads of the nut and the pipe joint are tightened, one surface of the measuring ring contacts the end surface where the nut and the pipe joint are connected; or, the second connection part of the connector and the first connection part of the pipe joint are connected by a press-fitting method; At least one protrusion is arranged on the outer cylindrical surface of the nut, and the protrusion protrudes from the outer cylindrical surface of the nut; there are multiple protrusions, which are evenly arranged on the outer cylindrical surface of the nut, and the cross-section of one end of the protrusion is a regular shape, and the middle part between the two ends of the protrusion is a cube.

2. The connector for use in a flow meter according to claim 1, characterized in that: A component for increasing pressure or friction is provided on the side where the flared tube and / or the connector are in contact with each other; or a component for increasing pressure or friction is provided on the side where the flared tube and / or the nut are in contact with each other.

3. The connector for use in a flow meter according to claim 2, characterized in that: A protrusion is provided on the side of the connector that contacts the first pipe of the expanded pipe; and / or a protrusion is provided on the side of the first pipe of the expanded pipe that contacts the connector; And / or, a protrusion is provided on the side where the first pipe of the flared pipe contacts the nut; and / or, a protrusion is provided on the side where the nut contacts the first pipe of the flared pipe; wherein the provided protrusion is an elastic protrusion.

4. The connector for use in a flow meter according to claim 3, characterized in that: A plurality of mutually engaging annular protrusions are staggeredly arranged at the contact portion between the connector and the first pipe of the flared pipe; and / or a plurality of mutually engaging annular protrusions are staggeredly arranged at the joint portion between the first pipe of the flared pipe and the inner side of the nut.

5. The connector for use in a flow meter according to claim 3, characterized in that: A chamfer is provided at one end of the connector that is connected to the flared pipe, and an annular protrusion is provided at the chamfer of the connector.

6. The connector for use in a flow meter according to claim 1, characterized in that: The end of the first pipe of the expanded tube is located in the gap formed by the nut and the connector, and the end of the first pipe does not contact the inner sides of the connector and the nut; the shape of the gap formed by the nut and the connector is adapted to the shape and size of the first pipe, one side of the end of the first pipe contacts the connector, and the other side of the end of the first pipe contacts the inner side of the nut.

7. The connector for use in a flow meter according to claim 1, characterized in that: The thread on the pipe joint is used to cooperate with the nut, and the connecting head is used to connect with the flared pipe. A chamfer is set at one end of the connecting head connected to the flared pipe.

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