Target current switch

Abstract

The utility model belongs to the technical field of fluid monitoring, and discloses a target flow switch. The target flow switch comprises a body cylinder, a mounting structure and a measuring rod, a mounting cavity with an open first end and a closed second end is formed in the body cylinder, the mounting structure is embedded in the opening and extends towards the second end of the mounting cavity, and a heat preservation layer is clamped between the mounting structure and the body cylinder; the measuring rod movably penetrates through the mounting structure, one end of the measuring rod is inserted into the mounting cavity, and the other end of the measuring rod extends out of the mounting cavity. The installation structure extends towards the second end of the installation cavity, so that the installation structure extends into the body cylinder to reach a certain length, the heat preservation layer is clamped between the installation structure and the body cylinder, heat loss in the installation cavity in a low-temperature environment can be prevented through the heat preservation layer, and the heat preservation performance of the target current switch is improved; the mounting structure separates the thermal insulation layer from the measuring rod, the measuring rod moves in the mounting structure to realize fluid monitoring, and the thermal insulation layer is prevented from occupying the moving space of the measuring rod.

Description

Technical Field

[0001] The utility model relates to the technical field of fluid monitoring, in particular to a target flow switch. Background Art

[0002] The target flow switch is installed on a pipeline for measuring the flow rate in the pipeline. The target flow switch includes a body and a vane system. When the fluid rushes towards the vane system, the measuring rod swings to trigger the operation of the target flow switch.

[0003] In the prior art, an installation cavity is provided in the body. A part of the measuring rod is located in the installation cavity and a part extends outside the installation cavity. The measuring rod moves in the installation cavity to achieve fluid monitoring. When the external environmental temperature is relatively low, the heat in the installation cavity will quickly dissipate. Once the liquid in the pipeline enters the installation cavity, the liquid will freeze in the installation cavity, affecting the normal use of the target flow switch.

[0004] That is, the existing target flow switch has the disadvantages that when the external environmental temperature is relatively low, the heat in the installation cavity quickly dissipates, the heat preservation performance of the installation cavity is poor, and further the liquid freezes, affecting the normal use of the target flow switch. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a target flow switch to solve the problems existing in the existing target flow switch, that is, when the external environmental temperature is relatively low, the heat in the installation cavity quickly dissipates, the heat preservation performance of the installation cavity is poor, and further the liquid freezes, affecting the normal use of the target flow switch.

[0006] To achieve the above purpose, the utility model adopts the following technical solutions:

[0007] The utility model provides a target flow switch, which includes:

[0008] A body cylinder, in which an installation cavity with an open first end and a closed second end is provided;

[0009] An installation structure, embedded at the opening and extending towards the second end of the installation cavity. A heat preservation layer is clamped between the installation structure and the body cylinder;

[0010] A measuring rod, movably passing through the installation structure. One end of the measuring rod is inserted into the installation cavity and the other end extends outside the installation cavity.

[0011] As an optional technical solution of the target flow switch, the installation structure includes two installation parts. The two installation parts are relatively closed to form a cylinder and sleeved outside the measuring rod.

[0012] As an optional technical solution of the target flow switch, the installation part includes:

[0013] An installation seat, arranged at the opening;

[0014] The isolation semi-cylinder is connected to the mounting seat, the mounting seat radially protrudes from the isolation semi-cylinder, and the heat insulation layer is placed on the mounting seat and sleeved outside the isolation semi-cylinder.

[0015] As an alternative technical solution of the target flow switch, one end of the isolation semi-cylinder is connected to the mounting seat, and a limiting portion is radially protruded at the other end of the isolation semi-cylinder for blocking the heat insulation layer.

[0016] As an alternative technical solution of the target flow switch, it further includes a sealing sleeve, the sealing sleeve is located outside the installation cavity, the sealing sleeve is sleeved outside the measuring rod and hermetically wraps the connection between the measuring rod and the installation structure.

[0017] As an alternative technical solution of the target flow switch, the installation structure is provided with a first annular groove, and the end of the sealing sleeve is located in the first annular groove to hermetically wrap part of the installation structure;

[0018] And / or, a second annular groove is provided on the outer side of the measuring rod, and the end of the sealing sleeve is located in the second annular groove and hermetically wraps the measuring rod.

[0019] As an alternative technical solution of the target flow switch, it further includes a first sealing ring, and the first sealing ring is located between the main body cylinder and the installation structure.

[0020] As an alternative technical solution of the target flow switch, a receiving groove for accommodating the first sealing ring is provided on the outer side of the installation structure, and both sides of the first sealing ring are respectively abutted against the inner wall of the main body cylinder and the bottom wall of the receiving groove.

[0021] As an alternative technical solution of the target flow switch, a second sealing ring is provided at the open end of the main body cylinder, and the second sealing ring is used to seal the gap between the main body cylinder and the pipeline to be measured.

[0022] As an alternative technical solution of the target flow switch, it further includes a protective sleeve sleeved outside the measuring rod, and the protective sleeve is detachably connected to the open end of the main body cylinder.

[0023] Beneficial effects:

[0024] The present utility model provides a target flow switch. The target flow switch includes a body cylinder, an installation structure, and a measuring rod. An installation cavity with an open first end and a closed second end is provided inside the body cylinder. The installation structure is embedded at the opening and extends towards the second end of the installation cavity. A heat insulation layer is clamped between the installation structure and the body cylinder; the measuring rod movably penetrates through the installation structure, one end of the measuring rod is inserted into the installation cavity, and the other end extends outside the installation cavity. By setting the installation structure to extend towards the second end of the installation cavity, the installation structure extends into the body cylinder to a certain length, and a heat insulation layer is clamped between the installation structure and the body cylinder. The structure of the heat insulation layer can effectively prevent the heat loss in the installation cavity in a low-temperature environment and improve the heat insulation performance of the target flow switch; moreover, the measuring rod is connected to the body cylinder through the installation structure. The installation structure can separate the heat insulation layer from the measuring rod, and the measuring rod can move in the installation structure to realize fluid monitoring, avoiding the heat insulation layer occupying the moving space of the measuring rod. Description of the Drawings

[0025] Figure 1 is a schematic structural diagram of the target flow switch provided by an embodiment of the present utility model;

[0026] Figure 2 is a cross-sectional view of the target flow switch provided by an embodiment of the present utility model;

[0027] Figure 3 is an exploded view of the target flow switch provided by an embodiment of the present utility model;

[0028] Figure 4 is a split view of the installation structure provided by an embodiment of the present utility model;

[0029] Figure 5 is a cross-sectional view of the body cylinder provided by an embodiment of the present utility model.

[0030] In the figure:

[0031] 1, body cylinder; 11, card slot; 12, limiting protrusion;

[0032] 2, measuring rod; 21, on-off magnet; 22, rod main body; 221, second annular groove; 23, blade; 24, pendulum needle;

[0033] 3, installation part; 3a, first installation part; 3b, second installation part; 31, installation seat; 311, clamping protrusion; 312, groove; 32, isolation half cylinder; 321, limiting part;

[0034] 4, heat insulation layer;

[0035] 5, magnetic induction component; 51, reed switch; 52, magnetic reed switch box; 53, connecting wire;

[0036] 61, sealing sleeve; 62, first sealing ring; 63, second sealing ring;

[0037] 71. Sleeve; 72. Return magnet; 8. Connecting nut; 9. Protective sleeve. Specific embodiments

[0038] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. Additionally, it should be noted that for the sake of description, only the parts related to the present utility model are shown in the drawings, rather than all the structures.

[0039] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0040] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath", and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.

[0041] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0042] Such as Figures 1 to 5As shown in the figure, this embodiment provides a target flow switch, which includes a main body cylinder 1, a mounting structure, and a measuring rod 2. The main body cylinder 1 is provided with a mounting cavity with an open first end and a closed second end. The mounting structure is embedded at the opening and extends towards the second end of the mounting cavity. A heat insulation layer 4 is clamped between the mounting structure and the main body cylinder 1; the measuring rod 2 is movably inserted through the mounting structure, one end of the measuring rod 2 is inserted into the mounting cavity, and the other end of the measuring rod 2 extends outside the mounting cavity.

[0043] By setting the mounting structure to extend towards the second end of the mounting cavity, the mounting structure extends into the main body cylinder 1 to a certain length, and a heat insulation layer 4 is clamped between the mounting structure and the main body cylinder 1. The structure of the heat insulation layer 4 can effectively prevent the heat loss in the mounting cavity in a low-temperature environment and improve the heat insulation performance of the target flow switch; and the measuring rod 2 is connected to the main body cylinder 1 through the mounting structure. The mounting structure can separate the heat insulation layer 4 from the measuring rod 2, and the measuring rod 2 can move in the mounting structure to realize fluid monitoring, avoiding the heat insulation layer 4 occupying the moving space of the measuring rod 2.

[0044] See Figure 2 and Figure 3 , the measuring rod 2 includes a rod main body 22. The top end of the rod main body 22 is located in the mounting cavity, the bottom end of the rod main body 22 extends outside the mounting cavity. A conical frustum is provided at the top end of the rod main body 22, a make-and-break magnet 21 is provided inside the conical frustum, and a blade 23 is provided at the bottom end of the rod main body 22.

[0045] In this embodiment, the target flow switch further includes a magnetic induction component 5. The magnetic induction component 5 is arranged on the main body cylinder 1 and located outside the mounting cavity. The measuring rod 2 can move in the mounting cavity so that the make-and-break magnet 21 approaches the magnetic induction component 5 to trigger the target flow switch to work, or the make-and-break magnet 21 moves away from the magnetic induction component 5 to stop the target flow switch from working.

[0046] Optionally, the magnetic induction component 5 includes a reed switch 51, a magnetic reed switch box 52, and a connecting wire 53. One end of the reed switch 51 is arranged inside the magnetic reed switch box 52, and the other end of the reed switch 51 is connected with the connecting wire 53.

[0047] In this embodiment, the magnetic reed switch box 52 is arranged through the top end of the main body cylinder 1 in the radial direction. The magnetic induction component 5 is located above the mounting cavity; the top end of the main body cylinder 1 is connected to the magnetic reed switch box 52 by screws; the magnetic reed switch box 52 is filled with resin, which can protect the reed switch 51 and increase the sealing performance, improving the service life.

[0048] The target flow switch further includes a sleeve 71 and a reset magnet 72. The sleeve 71 is sleeved outside the main body cylinder 1, and the reset magnet 72 is arranged inside the sleeve 71. There are two reset magnets 72, which are oppositely arranged on both sides of the main body cylinder 1. The two reset magnets 72 can generate a repulsive force with the on-off magnet 21, so that the measuring rod 2 is kept at the central position of the installation cavity.

[0049] Further, the installation structure includes two installation members 3. The installation members 3 are relatively closed to form a cylinder shape and are sleeved outside the measuring rod 2. The installation member 3 includes an installation base 31 and an isolation half cylinder 32. The installation base 31 is arranged at the opening of the installation cavity, and the isolation half cylinder 32 is connected to the installation base 31. The installation base 31 protrudes radially from the isolation half cylinder 32. The heat insulation layer 4 is placed on the installation base 31 and sleeved outside the isolation half cylinder 32. By setting the two installation members 3 to be closed and sleeved outside the measuring rod 2 together, the measuring rod 2 can be arranged in the main body cylinder 1 through the installation structure, and it is also convenient to install the installation structure in the main body cylinder 1. By setting the installation base 31 and the isolation half cylinder 32, the installation base 31 is used to connect with the main body cylinder 1 and the measuring rod 2 is arranged inside, and the isolation half cylinder 32 is arranged in the installation cavity to isolate the measuring rod 2 and the heat insulation layer 4. By setting the installation base 31 to protrude radially from the isolation half cylinder 32, the installation base 31 can support the heat insulation layer 4 and arrange the heat insulation layer 4 in the installation cavity.

[0050] See Figure 4 , the two installation members 3 are respectively a first installation member 3a and a second installation member 3b. Both the first installation member 3a and the second installation member 3b include an installation base 31 and an isolation half cylinder 32. The installation bases 31 of the first installation member 3a and the second installation member 3b are butted to form a disc-shaped base, and the isolation half cylinders 32 of the first installation member 3a and the second installation member 3b are butted to form a cylinder. The measuring rod 2 is located between the first installation member 3a and the second installation member 3b. In this embodiment, the heat insulation layer 4 is in a cylindrical shape. The inner diameter of the cylinder formed by butting the two isolation half cylinders 32 is larger than the outer diameter of the measuring rod 2, the inner diameter of the cylinder formed by butting the two isolation half cylinders 32 is matched with the inner diameter of the heat insulation layer 4, and the outer diameter of the heat insulation layer 4 is matched with the inner diameter of the main body cylinder 1.

[0051] Specifically, positioning columns and positioning holes are provided on the planes of the first installation member 3a and the second installation member 3b facing each other. The positioning columns can be inserted into the positioning grooves, so as to limit the butting positions of the first installation member 3a and the second installation member 3b. Both the first installation member 3a and the second installation member 3b are provided with two positioning columns and two positioning holes. The positioning columns are cylinders, and the positioning holes are circular blind holes. Optionally, the isolation half cylinder 32 is arranged in a hollow structure. By arranging the isolation half cylinders 32 of the first installation member 3a and the second installation member 3b to be hollow, materials can be saved.

[0052] In this embodiment, the installation structure measuring rod 2 further includes a pendulum needle 24. The pendulum needle 24 is fixedly inserted through the rod main body 22, and the extending directions of the rod main body 22 and the pendulum needle 24 are perpendicular to each other; both ends of the pendulum needle 24 extend outside the rod main body 22 and are respectively inserted into the first installation member 3a and the second installation member 3b; the measuring rod 2 can swing left and right around the axis direction of the pendulum needle 24. In other embodiments, a columnar protrusion can also be directly provided on the measuring rod 2, and the columnar protrusion is rotatably inserted into the installation structure, so that the measuring rod 2 can swing left and right.

[0053] Further, one end of the isolation half cylinder 32 is connected to the mounting seat 31, and the other end radially protrudes with a limiting portion 321 for blocking the heat insulation layer 4. By providing the limiting portion 321 on the isolation half cylinder 32, the limiting portion 321 can limit the heat insulation layer 4 from the top, and the heat insulation layer 4 is located between the mounting seat 31 and the limiting portion 321, avoiding the displacement of the heat insulation layer 4 from affecting the normal use of the measuring rod 2. In this embodiment, the limiting portion 321 is in the shape of a flat plate, and two limiting portions 321 are relatively arranged on both the first installation member 3a and the second installation member 3b.

[0054] In this embodiment, the heat insulation layer 4 is an anti-freezing cotton; the anti-freezing cotton can be made of high-quality heat insulation materials, such as polyester fiber cotton, rubber and plastic sponge or ultra-fine glass wool, etc.; the anti-freezing cotton has good heat insulation performance, reducing the heat exchange between the external environment and the installation cavity, so as to ensure that a certain temperature is maintained in the installation cavity in the external low-temperature environment and avoid the temperature in the installation cavity from being too low.

[0055] If the liquid to be measured enters the installation cavity, the liquid to be measured is likely to freeze in the installation cavity in a low-temperature environment. In order to prevent the liquid to be measured from entering the installation cavity, the target flow switch further includes a sealing sleeve 61. The sealing sleeve 61 is located outside the installation cavity, and the sealing sleeve 61 is sleeved outside the measuring rod 2 and tightly wraps the connection between the measuring rod 2 and the installation structure. By providing the sealing sleeve 61, the connection between the measuring rod 2 and the installation structure is sealed, avoiding the liquid to be measured from entering the installation cavity through the gap at the connection.

[0056] Optionally, the installation structure is provided with a first annular groove, and the end of the sealing sleeve 61 is located in the first annular groove to tightly wrap a part of the installation structure; and / or, a second annular groove 221 is provided on the outer side of the measuring rod 2, and the end of the sealing sleeve 61 is located in the second annular groove 221 and tightly wraps the measuring rod 2. By providing the first annular groove on the installation structure and the second annular groove 221 on the outer side of the measuring rod 2, the position of the end of the sealing sleeve 61 is restricted by the annular groove, so that the sealing sleeve 61 is tightly sleeved at the connection between the measuring rod 2 and the installation structure.

[0057] In this embodiment, the measuring rod 2 is a round rod, and a second annular groove 221 is provided on the outer side of the measuring rod 2; a groove 312 is provided on the mounting seat 31. When the mounting seats 31 of the first mounting member 3a and the second mounting member 3b are butted, the two grooves 312 are combined into an annular groove as the first annular groove, and the sealing sleeve 61 is sleeved on the two grooves 312 and wraps part of the first mounting member 3a and the second mounting member 3b.

[0058] See Figure 4 and Figure 5 In order to fix the mounting structure on the main body cylinder 1, clamping protrusions 311 are provided on the outer sides of the mounting seats 31 of the first mounting member 3a and the second mounting member 3b, and clamping grooves 11 that cooperate with the clamping protrusions 311 are provided on the inner side of the main body cylinder 1. By providing the cooperation of the clamping protrusions 311 and the clamping grooves 11 for clamping, after the first mounting member 3a and the second mounting member 3b are butted and combined, they are pushed into the mounting cavity of the main body cylinder 1, and the clamping protrusions 311 are clamped with the clamping grooves 11, which is convenient for installation and firmly fixed.

[0059] Optionally, a limiting protrusion 12 is further provided on the inner side of the main body cylinder 1, and a limiting groove that cooperates with the limiting protrusion 12 is provided on the outer side of the mounting structure, so as to be able to limit the relative position of the first mounting member 3a and the second mounting member 3b with respect to the main body cylinder 1 and prevent the mounting member 3 from rotating relative to the main body cylinder 1.

[0060] In this embodiment, two limiting grooves are provided. The two limiting grooves are respectively provided on the first mounting member 3a and the second mounting member 3b and are located at the butting position of the first mounting member 3a and the second mounting member 3b, that is, a limiting groove is processed with the butting seam of the first mounting member 3a and the second mounting member 3b as the processing axis; the limiting groove is a semi-cylindrical groove, and the limiting protrusion 12 is semi-cylindrical. In other embodiments, a limiting protrusion 12 may also be provided on the mounting structure, and a limiting groove may be provided on the main body cylinder 1.

[0061] Optionally, the target flow switch further includes a first sealing ring 62, and the first sealing ring 62 is located between the main body cylinder 1 and the mounting structure. By providing the first sealing ring 62, the gap between the main body cylinder 1 and the mounting structure is sealed to prevent the liquid to be measured from entering the mounting cavity from the gap.

[0062] In this embodiment, a receiving groove for receiving the first sealing ring 62 is provided on the outer side of the mounting structure, and both sides of the first sealing ring 62 are respectively abutted against the inner wall of the main body cylinder 1 and the bottom wall of the receiving groove. By providing the receiving groove, the first sealing ring 62 can be received and the position of the first sealing ring 62 can be limited.

[0063] Optionally, a second sealing ring 63 is provided at the open end of the main body cylinder 1. The second sealing ring 63 is used to seal the gap between the main body cylinder 1 and the pipeline to be measured. By providing the second sealing ring 63, when the target flow switch is connected to the pipeline to be measured, the second sealing ring 63 can seal the gap at the connection between the main body cylinder 1 and the pipeline to be measured, thereby preventing the liquid to be measured from flowing out through the gap. In this embodiment, the sealing sleeve 61, the first sealing ring 62 and the second sealing ring 63 can all be made of rubber or silica gel materials.

[0064] In this embodiment, the target flow switch further includes a connecting nut 8. The connecting nut 8 is sleeved outside the main body cylinder 1. The connecting nut 8 is provided with internal threads and is used for threaded connection with the pipeline to be measured. By providing the connecting nut 8, the target flow switch can be conveniently installed on the pipeline to be measured. The connecting nut 8 can be made of plastic material.

[0065] When the target flow switch is not in use, it is necessary to remove the target flow switch from the pipeline to be measured. To protect the measuring rod 2, the target flow switch further includes a protective sleeve 9. The protective sleeve 9 is sleeved outside the measuring rod 2 and is detachably connected to the open end of the main body cylinder 1. By providing the protective sleeve 9 connected to the open end of the main body cylinder 1, after the protective sleeve 9 is put on, the protective sleeve 9 can effectively protect the measuring rod 2 and prevent impurities from affecting the detection accuracy of the measuring rod 2. When using the target flow switch, only the protective sleeve 9 needs to be removed.

[0066] In this embodiment, the protective sleeve 9 is provided with external threads. The external threads of the protective sleeve 9 can be matched with the internal threads of the connecting nut 8. The protective sleeve 9 and the connecting nut 8 are tightened by threads, so that the protective sleeve 9 can be fixed at the open end of the main body cylinder 1.

[0067] Obviously, the above embodiments of the present invention are only examples for clearly explaining the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Target current switch, characterized in that: include: A main body tube (1), wherein a mounting cavity having an opening at a first end and a closed second end is provided in the main body tube (1); a mounting structure embedded in the opening and extending toward the second end of the mounting cavity, wherein a heat-insulating layer (4) is sandwiched between the mounting structure and the main body tube (1); A measuring rod (2) is movably arranged in the mounting structure, one end of the measuring rod (2) is inserted into the mounting cavity, and the other end extends out of the mounting cavity.

2. The target current switch according to claim 1, characterized in that: The mounting structure comprises two mounting parts (3), the two mounting parts (3) are relatively folded to form a cylindrical shape and are sleeved on the outside of the measuring rod (2).

3. The target current switch according to claim 2, characterized in that: The mounting member (3) comprises: A mounting seat (31) is arranged at the opening; The isolating half-cylinder (32) is connected to the mounting seat (31), the mounting seat (31) radially protrudes from the isolating half-cylinder (32), and the thermal insulation layer (4) is placed on the mounting seat (31) and sleeved outside the isolating half-cylinder (32).

4. The target current switch according to claim 3, characterized in that: One end of the isolation half-cylinder (32) is connected to the mounting seat (31), and the other end of the isolation half-cylinder (32) is radially protruded with a limiting portion (321) for blocking the thermal insulation layer (4).

5. The target current switch according to claim 1, characterized in that: It also comprises a sealing sleeve (61), wherein the sealing sleeve (61) is located outside the installation cavity, and the sealing sleeve (61) is sleeved outside the measuring rod (2) and is sealed around the connection between the measuring rod (2) and the installation structure.

6. The target current switch according to claim 5, characterized in that: The mounting structure is provided with a first annular groove, and the end of the sealing sleeve (61) is located in the first annular groove to seal and wrap a portion of the mounting structure; And / or, a second annular groove (221) is provided on the outer side of the measuring rod (2), and the end of the sealing sleeve (61) is located in the second annular groove (221) and is sealed and wrapped around the measuring rod (2).

7. The target current switch according to claim 1, characterized in that: It also includes a first sealing ring (62), wherein the first sealing ring (62) is located between the main body tube (1) and the mounting structure.

8. The target current switch according to claim 7, characterized in that: The outer side of the mounting structure is provided with a receiving groove for accommodating the first sealing ring (62), and two sides of the first sealing ring (62) respectively abut against the inner wall of the main body tube (1) and the bottom wall of the receiving groove.

9. The target current switch according to any one of claims 1 to 8, characterized in that: The open end of the main body tube (1) is provided with a second sealing ring (63), and the second sealing ring (63) is used to seal the gap between the main body tube (1) and the pipeline to be tested.

10. The target current switch according to any one of claims 1 to 8, characterized in that: It also comprises a protective sleeve (9) sleeved on the outside of the measuring rod (2), and the protective sleeve (9) is detachably connected to the open end of the main body tube (1).

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