A double-tube protection thermocouple

Abstract

The invention provides a double-tube protection thermocouple. The device is provided with a protection tube and a driving component on the basis of the structure of an existing thermocouple. The protection tube is sleeved outside the sleeve to protect the sleeve and prevent the sleeve from being deformed by external force. In addition, a plurality of inclined elastic baffles are provided at the bottom of the protection tube. The elastic baffles are used to protect the measuring end of the thermocouple sleeve, and the elastic baffles are spaced apart from each other, so that the measuring accuracy of the thermocouple is not affected when measuring the temperature of the fluid. In addition, the protection tube can be driven to move upward by the driving component, so that the measuring end of the thermocouple squeezes the elastic baffle and causes the elastic baffle to undergo elastic deformation, so that the elastic baffle can be exposed from the conical cavity, thereby improving the accuracy of measuring the solid temperature.

Description

Technical Field

[0001] The invention relates to the field of thermocouples, and in particular to a double-tube protection thermocouple. Background Art

[0002] Thermocouples are commonly used temperature measuring elements in temperature measuring instruments. They directly measure temperature and convert temperature signals into thermoelectric potential signals, which are then converted into the temperature of the measured medium through electrical instruments. The appearance of various thermocouples is often very different due to needs, but their basic structure is roughly the same. They are usually composed of main parts such as hot electrodes, insulating sleeve protection tubes and junction boxes, and need to be used in conjunction with display instruments, recording instruments and electronic regulators.

[0003] In the prior art, since the insulating sleeve protection tube of the thermocouple is relatively slender, it is easy to bend and deform due to external force during installation, which further affects the measurement accuracy of the thermocouple. Therefore, there is room for further improvement. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a double-tube protection thermocouple, which mainly solves the problem that the thermocouple in the prior art has a slender sleeve, which is easy to cause the sleeve to bend during installation and use, thereby affecting the temperature measurement effect.

[0005] A double-tube protection thermocouple, comprising a junction box and a sleeve, wherein the sleeve is arranged below the junction box, and a thermode is arranged inside the sleeve, and is characterized in that: it also comprises a driving component and a protection tube;

[0006] The protective tube is sleeved outside the casing, and the axes of the two are collinear; a gap is left between the protective tube and the casing; the bottom end of the protective tube is open, and a plurality of elastic baffles are arranged circumferentially with intervals between them; the elastic baffles are all inclined toward the axis of the casing, thereby forming a tapered cavity for accommodating the measuring end of the casing;

[0007] The protection tube is connected to the driving assembly and is driven by the driving assembly to move along the axial direction of the casing, so that the measuring end of the casing is exposed from the tapered cavity or hidden in the tapered cavity.

[0008] Preferably, the driving assembly includes a rotating drum; the rotating drum is sleeved outside the sleeve and is installed below the junction box so as to be rotatable around the sleeve axis; the inner wall of the rotating drum is provided with an internal thread, the outer wall of the protective tube is provided with an external thread, and the rotating drum is threadedly connected to the protective tube.

[0009] Preferably, a positioning seat is provided below the junction box, a circumferential guide rail is provided on the positioning seat, and the rotating drum is rotatably mounted on the guide rail.

[0010] Preferably, anti-slip protrusions are provided on the outer wall of the drum.

[0011] Preferably, a through hole is formed at the top of the protective tube for the sleeve to pass through, and a sealing ring is provided in the through hole.

[0012] Preferably, a plurality of reinforcement layers are provided on the inner wall of the protection tube along the axial direction thereof, and a plurality of reinforcement rods are provided in each reinforcement layer.

[0013] Preferably, the multiple reinforcing rods in the reinforcing layer are arranged horizontally and distributed in a circular array with the center of the array located on the axis of the sleeve; a space area is enclosed between the multiple reinforcing rods for the sleeve to pass through.

[0014] Preferably, all the reinforcement layers are spirally distributed on the inner wall of the protection tube.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. A double-tube protection thermocouple is provided. The device is provided with a protection tube and a driving assembly based on the structure of an existing thermocouple. The protection tube is sleeved outside the sleeve to protect the sleeve and prevent the sleeve from being deformed by external force. In addition, a plurality of inclined elastic baffles are provided at the bottom of the protection tube. The elastic baffles are used to protect the measuring end of the thermocouple sleeve, and there is a gap between the elastic baffles, which will not affect the measurement accuracy of the thermocouple when measuring the temperature of the fluid. In addition, the protection tube can be driven to move upward by the driving assembly, so that the measuring end of the thermocouple squeezes the elastic baffle and causes the elastic baffle to undergo elastic deformation, so that it can be exposed from the conical cavity, which can improve the accuracy of measuring the solid temperature.

[0017] 2. In order to improve the strength of the protective tube, multiple reinforcement layers are provided on the inner wall of the protective tube along its axial direction. Multiple reinforcement rods are provided in each reinforcement layer. All reinforcement layers are spirally distributed on the inner wall of the protective tube, that is, there is an angle between any adjacent reinforcement layers, so that the protective tube can withstand more forces from different angles and improve the protection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an external view of the double-tube protection thermocouple proposed by the present invention;

[0019] Figure 2 It is an internal view of the double-tube protection thermocouple proposed by the present invention;

[0020] Figure 3 is a cross-sectional view of the protection tube of the present invention;

[0021] Figure 4 is a bottom view of the protection tube of the present invention;

[0022] The reference numerals are as follows:

[0023] 1. Junction box; 2. Positioning seat; 3. Rotating drum; 4. Protective tube; 5. Elastic baffle; 6. Guide rail; 7. Sleeve; 8. Reinforcement rod. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, unless otherwise specified, "multiple" means two or more. The orientation or state relationship indicated by the terms "inside", "upper", "lower", etc. is based on the orientation or state relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention; the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so as to describe the embodiments of the present invention described herein.

[0026] like Figure 1-4 A double-tube protection thermocouple shown includes a junction box 1 and a sleeve 7, wherein the sleeve 7 is arranged below the junction box 1, a thermode is arranged inside the sleeve 7, and further includes a drive assembly and a protection tube 4;

[0027] The protection tube 4 is sleeved outside the sleeve 7, and the axes of the two are collinear; a gap is left between the protection tube 4 and the sleeve 7; the bottom end of the protection tube 4 is open, and a plurality of elastic baffles 5 are circumferentially arranged with intervals between each other; the elastic baffles 5 are all inclined toward the axis of the sleeve 7, thereby forming a tapered cavity for accommodating the measuring end of the sleeve 7;

[0028] The protection tube 4 is connected to the driving assembly and is driven by the driving assembly to move axially along the sleeve 7, so that the measuring end of the sleeve 7 is exposed from the tapered cavity or hidden in the tapered cavity.

[0029] In view of the problem that the thermocouple in the prior art has a slender sleeve 7, which may easily cause the sleeve 7 to bend during installation and use, thereby affecting the temperature measurement effect, this embodiment designs a double-tube protective thermocouple. The device is provided with a protective tube 4 and a driving component on the basis of the structure of the existing thermocouple, wherein the protective tube 4 is sleeved on the outside of the sleeve 7 to protect the sleeve 7 and prevent the sleeve 7 from being deformed by external force; in addition, a plurality of inclined elastic baffles 5 are provided at the bottom of the protective tube 4, and the elastic baffles 5 are used to protect the measuring end of the thermocouple sleeve 7, and the elastic baffles 5 are spaced from each other, which will not affect the measurement accuracy of the thermocouple when measuring the temperature of the fluid; in addition, the protective tube 7 can be driven to move upward by the driving component, so that the measuring end of the thermocouple squeezes the elastic baffle 5 and causes the elastic baffle 5 to undergo elastic deformation, so that it can be exposed from the conical cavity, which can improve the accuracy of measuring the solid temperature.

[0030] Further specific settings such as Figure 2 and Figure 3 As shown, the driving assembly includes a rotating drum 3, which is sleeved on the outside of the sleeve 7 and can be installed below the junction box 1 to rotate around the axis of the sleeve 7. The specific structure is that a positioning seat 2 is provided below the junction box 1, and a circumferential guide rail 6 is provided on the positioning seat 2. The rotating drum 3 is rotatably installed on the guide rail 6. The guide rail 6 is a T-shaped guide rail, which can realize the rotation of the rotating drum 3 and prevent the rotating drum 3 from falling off the positioning seat 2; the inner wall of the rotating drum 3 is provided with an internal thread, and the outer wall of the protective tube 4 is provided with an external thread. The rotating drum 3 is threadedly connected to the protective tube 4, and the vertical movement of the protective tube 4 can be realized by rotating the rotating drum 3.

[0031] In order to facilitate rotation, vertical anti-slip protrusions are provided on the outer wall of the rotating drum 3; in order to prevent the fluid from overflowing from the protective tube 4 when the thermocouple measures the fluid temperature, a through hole is opened at the top of the protective tube 4 in this embodiment for the sleeve 7 to pass through. The diameter of the through hole is equal to the diameter of the sleeve 7, and a sealing ring is provided in the through hole.

[0032] Furthermore, in order to improve the strength of the protection tube 4, a plurality of reinforcement layers are provided on the inner wall of the protection tube 4 along its axial direction, and a plurality of reinforcement rods 8 are provided in each reinforcement layer; the plurality of reinforcement rods 8 are arranged horizontally and distributed in a circular array with the center of the array located on the axis of the casing 7; a space area is formed between the plurality of reinforcement rods 8 for the casing 7 to pass through, such as Figure 3 As shown, in this embodiment, four reinforcing rods 8 are provided in each reinforcing layer, and the four reinforcing rods 8 are distributed in a square shape; further, all the reinforcing layers are spirally distributed on the inner wall of the protective tube 4, that is, there is an angle between any adjacent reinforcing layers, so that the protective tube 4 can withstand more forces from different angles, thereby improving the protection effect.

[0033] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A double-tube protected thermocouple, comprising a junction box (1) and a sleeve (7), wherein the sleeve (7) is arranged below the junction box (1), and a thermode is arranged inside the sleeve (7), characterized in that: Also includes a drive assembly and a protective tube; The protection tube (4) is sleeved outside the sleeve (7), and the axes of the two are collinear; a gap is left between the protection tube (4) and the sleeve (7); the bottom end of the protection tube (4) is open, and a plurality of elastic baffles (5) are provided in the circumferential direction with intervals between them; the elastic baffles (5) are all inclined toward the axis of the sleeve (7), thereby forming a tapered cavity for accommodating the measuring end of the sleeve (7); The protection tube (4) is connected to the driving assembly and is driven by the driving assembly to move axially along the sleeve (7), so that the measuring end of the sleeve (7) is exposed from the conical cavity or hidden in the conical cavity; The elastic baffles (5) are spaced apart from each other, so that the measurement accuracy of the thermocouple is not affected when measuring the temperature of the fluid; in addition, the protective tube (4) can be driven upward by the driving component, so that the measuring end of the thermocouple squeezes the elastic baffle (5) and causes the elastic baffle (5) to undergo elastic deformation, so that the elastic baffle (5) can be exposed from the conical cavity, thereby improving the accuracy of measuring the solid temperature; The driving assembly comprises a rotating drum (3); the rotating drum (3) is sleeved outside the sleeve (7) and is installed below the junction box (1) so as to be rotatable around the axis of the sleeve (7); the inner wall of the rotating drum (3) is provided with an internal thread, the outer wall of the protective tube (4) is provided with an external thread, and the rotating drum (3) and the protective tube (4) are threadedly connected; A positioning seat (2) is provided below the junction box (1), a circumferential guide rail (6) is provided on the positioning seat (2), and the rotating drum (3) is rotatably mounted on the guide rail (6); The guide rail (6) is a T-shaped guide rail.

2. The double-tube protection thermocouple according to claim 1, characterized in that: Anti-slip protrusions are provided on the outer wall of the rotating drum (3).

3. The double-tube protection thermocouple according to claim 1, characterized in that: A through hole is formed at the top of the protection tube (4) for the sleeve (7) to pass through, and a sealing ring is arranged in the through hole.

4. The double-tube protection thermocouple according to claim 1, characterized in that: A plurality of reinforcement layers are arranged on the inner wall of the protection tube (4) along its axial direction, and a plurality of reinforcement rods (8) are arranged in each reinforcement layer.

5. The double-tube protection thermocouple according to claim 4, characterized in that: The multiple reinforcing rods (8) in the reinforcing layer are arranged horizontally and distributed in a circular array with the center of the array located on the axis of the sleeve (7); the multiple reinforcing rods (8) enclose a space area for the sleeve (7) to pass through.

6. The double-tube protection thermocouple according to claim 5, characterized in that: All the reinforcement layers are spirally distributed on the inner wall of the protection tube (4).

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