Thermal resistor capable of adjusting position of measuring end

Abstract

The utility model discloses a thermal resistor capable of adjusting the position of a measuring end, which belongs to the technical field of thermal resistors and comprises a thermal resistor junction box, a shell, a rotary drum, a probe connecting rod and a positioning rod, the shell is fixedly mounted at the lower end of the thermal resistor junction box, the rotary drum is rotatably assembled in the shell, and the probe connecting rod and the positioning rod are movably assembled in the shell. A rotating drum is arranged in the shell, a T-shaped block is arranged in the rotating drum, an outer guide groove is formed in the outer surface of the rotating drum, an inner guide groove is formed in the inner surface of the rotating drum, and a probe moving block inserted into the inner guide groove is fixedly installed on the outer surface of the probe connecting rod. The probe connecting rod and the positioning rod are driven to move through the outer guide groove and the inner guide groove, the stroke of the probe connecting rod is half of the stroke of the positioning rod, when the positioning rod makes contact with the inner wall of the pipeline, it can be determined that the probe on the probe connecting rod is located at the center line of the pipeline, and the temperature measurement accuracy of the thermal resistor is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of thermal resistors, and in particular provides a thermal resistor capable of adjusting the position of a measuring end. Background Art

[0002] Thermal resistors are widely used temperature detection devices in medium and low temperature areas. Their working principle is based on the property that the resistance value of a conductor or semiconductor changes with temperature, and they are used to measure temperature and its related parameters. When using a thermal resistor to measure the temperature of a fluid in a pipeline, the measuring end of the thermal resistor should be placed at the point where the flow rate is the highest in the pipeline to make the measurement result most accurate. The point where the flow rate is the highest in the pipeline is generally located at the center line of the pipeline. However, since most pipelines are metal pipelines and are not transparent, it is difficult to accurately place the measuring end at the center line of the pipeline when installing the thermal resistor, which will affect the accuracy of the temperature measurement data. Therefore, a thermal resistor with an adjustable measuring end position is required to accurately place it at the center line of the pipeline. Utility Model Content

[0003] In order to solve the above problems, the utility model provides a thermal resistor with adjustable measuring end position.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a thermal resistor with adjustable measuring end position, comprising a thermal resistor junction box, a shell, a rotating drum, a probe connecting rod and a positioning rod, the shell being fixedly installed at the lower end of the thermal resistor junction box, the rotating drum being rotatably assembled in the shell, a probe being fixedly installed at the lower end of the probe connecting rod, the probe connecting rod and the positioning rod being movably assembled in the shell, an outer guide groove being provided on the outer surface of the rotating drum, and there are two outer guide grooves in total, the two outer guide grooves being arranged in a double helix shape, an inner guide groove being provided on the inner surface of the rotating drum, and the stroke of the outer guide groove being twice the stroke of the inner guide groove when the rotating drum rotates one circle, a probe moving block plugged into the inner guide groove being fixedly installed on the outer surface of the probe connecting rod, and a positioning rod moving block plugged into the outer guide groove being fixedly installed on the inner end surface of the positioning rod;

[0005] The shell is composed of a front shell and a rear shell, and the left ends of the front shell and the rear shell are integrally formed with a rectangular shell. The inner surface of the rectangular shell is movably equipped with a T-shaped rod, and the inner end of the T-shaped rod is fixedly installed with a T-shaped rod moving block inserted in the outer guide groove.

[0006] Furthermore, a connecting rod is fixedly installed on the lower side of the inner surface of the shell, and a guide ring is fixedly installed on the inner end of the connecting rod, and the probe connecting rod passes through the guide ring. A through groove is opened on the outer surface of the probe connecting rod, and an anti-rotation block inserted in the through groove is fixedly installed on the inner surface of the guide ring.

[0007] Furthermore, the outer ends of the two rectangular shells are integrally formed with mounting plates, the two mounting plates are connected by bolts and nuts, the right end face of the rear shell is provided with a snap-in groove, and the right end face of the front shell is fixedly installed with a snap-in rod inserted into the snap-in groove.

[0008] Furthermore, the outer surfaces of the two rectangular shells are symmetrically provided with sliding grooves, and the front and rear ends of the T-shaped rod respectively pass through the sliding grooves.

[0009] Furthermore, a static slide groove is provided at the lower end of the left surface of the inner cavity of the slide groove, and the width of the static slide groove is greater than the depth of the outer guide groove.

[0010] Furthermore, an auxiliary positioning block symmetrically distributed with the probe moving block is fixedly mounted on the outer surface of the probe connecting rod, and the auxiliary positioning block is in contact with the inner surface of the rotating drum.

[0011] Furthermore, positioning grooves are provided at both upper and lower ends of the outer surface of the rotating drum, and the depth of the positioning grooves is smaller than the depth of the outer guide grooves, and rotating drum positioning plates are symmetrically inserted into the positioning grooves front and back, and a mounting block is fixedly installed in the middle of the outer arc surface of the rotating drum positioning plate, and the mounting block is fixedly installed on the shell by screws, and the screws pass through the mounting block and the rotating drum positioning plate, and a disc spring is arranged between the nut of the screw and the shell.

[0012] Furthermore, the positioning rod is located between the right end surfaces of the front and rear drum positioning plates, the front and rear surfaces of the positioning rod are symmetrically provided with limiting grooves, and the right end surface of the drum positioning plate is fixedly installed with a limiting block inserted into the limiting groove.

[0013] Furthermore, both upper and lower sides of the middle of the outer arc surface of the front shell and the rear shell are provided with a drum positioning plate mounting groove, and the screws penetrate the drum positioning plate mounting groove and are screwed onto the mounting block.

[0014] Furthermore, a cushion block is fixedly mounted on the lower end of the positioning rod.

[0015] The beneficial effects of using the utility model are:

[0016] The utility model provides a rotating drum in a shell, which plays the role of a cylindrical cam. The rotating drum can be driven to rotate by moving a T-shaped block, and then the probe connecting rod and the positioning rod are driven to move through an outer guide groove and an inner guide groove. The stroke of the probe connecting rod is half of the stroke of the positioning rod. When the positioning rod contacts the inner wall of the pipeline, it can be determined that the probe on the probe connecting rod is at the center line of the pipeline, thereby improving the temperature measurement accuracy of the thermal resistor.

[0017] The utility model can adjust the position of the rotating drum by providing a rotating drum positioning plate and a rotating drum positioning plate mounting groove, and further adjust the initial alignment position of the probe and the pad block, so as to be suitable for different installation situations. In addition, after tightening the screws, the rotating drum will be pressed, so that the rotating drum can be fixed, ensuring that the position of the probe will not change at the center line of the pipeline, thereby further improving the accuracy of the temperature measurement work. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the front view of the utility model.

[0019] Figure 2 It is a main view section view of the utility model.

[0020] Figure 3 For this utility model Figure 1 Cross-sectional view along the AA direction.

[0021] Figure 4 It is an expanded view of the outer surface of the rotary drum of the utility model.

[0022] Figure 5 It is an expanded view of the inner surface of the rotary drum of the utility model.

[0023] The reference numerals include: 1, thermal resistor junction box, 2, shell, 21, guide ring, 22, clamping rod, 23, drum positioning plate mounting groove, 3, rectangular shell, 31, slide groove, 32, static slide groove, 4, drum, 41, outer guide groove, 42, inner guide groove, 43, positioning groove, 5, probe connecting rod, 51, probe, 52, probe moving block, 53, auxiliary positioning block, 6, positioning rod, 61, cushion block, 62, positioning rod moving block, 63, limiting groove, 7, drum positioning plate, 71, mounting block, 72, limiting block, 8, T-bar, 81, T-bar moving block, 9, mounting plate. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] Reference Figures 1 to 5A thermal resistor with adjustable measuring end position comprises a thermal resistor junction box 1, a shell 2, a rotating drum 4, a probe connecting rod 5 and a positioning rod 6. The shell 2 is fixedly installed at the lower end of the thermal resistor junction box 1, the rotating drum 4 is rotatably assembled in the shell 2, a probe 51 is fixedly installed at the lower end of the probe connecting rod 5, and the probe connecting rod 5 and the positioning rod 6 are both movably assembled in the shell 2. An outer guide groove 41 is provided on the outer surface of the rotating drum 4, and there are two outer guide grooves 41, and the two outer guide grooves 41 are arranged in a double helix shape. An inner guide groove 42 is provided on the inner surface of the rotating drum 4, and the stroke of the outer guide groove 41 is twice the stroke of the inner guide groove 42 when the rotating drum 4 rotates one circle. A probe moving block 52 inserted in the inner guide groove 42 is fixedly installed on the outer surface of the probe connecting rod 5, and a positioning rod moving block 62 inserted in the outer guide groove 41 is fixedly installed on the inner end surface of the positioning rod 6.

[0026] The lower end of the shell 2 is provided with a flange for connecting with the flange where the thermal resistor is installed on the pipeline.

[0027] When the thermal resistor and the pipeline are installed, the positions of the probe 51 and the cushion block 61 are aligned and both are located at the uppermost position of the inner wall of the pipeline.

[0028] The drum 4 is provided with an outer guide groove 41 and an inner guide groove 42 with a stroke in a two-fold relationship, so that it plays the role of a cylindrical cam, and the spiral direction of the outer guide groove 41 and the inner guide groove 42 are the same.

[0029] When the drum 4 rotates, the probe connecting rod 5 moves driven by the inner guide groove 42, and the positioning rod 6 moves driven by the outer guide groove 41, and the stroke of the positioning rod 6 is twice the stroke of the probe connecting rod 5. Therefore, when the lower end of the positioning rod 6 contacts the inner wall of the pipeline, it can ensure that the probe 51 is located on the center line of the pipeline, and the temperature in the pipeline can be accurately measured.

[0030] A channel is provided inside the probe connecting rod 5 for placing leads. The probe 51 is connected to the electronic components inside the thermal resistor junction box 1 through the leads. The leads located above the probe connecting rod 5 are spirally arranged so that the length of the leads can meet the movement of the probe connecting rod 5 and the probe 51.

[0031] The shell 2 is composed of a front shell and a rear shell. The left ends of the front shell and the rear shell are integrally formed with a rectangular shell 3. The inner surface of the rectangular shell 3 is movably equipped with a T-shaped rod 8. The inner end of the T-shaped rod 8 is fixedly installed with a T-shaped rod moving block 81 inserted into the outer guide groove 41.

[0032] When installing the internal structure of the housing 2, first install each structure on the front housing and the rear housing respectively, then splice and fix the front housing and the rear housing, and at the same time complete the docking installation of the internal structure.

[0033] The rotating drum 4 is driven to rotate by moving the T-shaped rod 8 up and down.

[0034] The outer guide groove 41 is in a double helix shape, so that both the positioning rod moving block 62 and the T-shaped rod moving block 81 can be inserted into the outer guide groove 41 .

[0035] A plurality of probe moving blocks 52 are evenly arranged on the probe connecting rod 5 , and a plurality of positioning rod moving blocks 62 are evenly arranged on the positioning rod 6 , so as to ensure that the rotation of the rotating drum 4 can always drive the probe connecting rod 5 and the positioning rod 6 to move.

[0036] In different situations, the length of the shell 2 and the drum 4 can be changed to further improve the application of this thermal resistor to pipes with different diameters.

[0037] Specifically, if Figure 2 and Figure 3 As shown, a connecting rod is fixedly installed on the lower side of the inner surface of the shell 2, and a guide ring 21 is fixedly installed on the inner end of the connecting rod, and the probe connecting rod 5 passes through the guide ring 21, a through groove is opened on the outer surface of the probe connecting rod 5, and an anti-rotation block inserted in the through groove is fixedly installed on the inner surface of the guide ring 21.

[0038] The setting of the guide ring 21 prevents the probe connecting rod 5 from rotating, so when the rotating drum 4 rotates, the probe connecting rod 5 can be guaranteed to move.

[0039] Specifically, if Figure 3 As shown, the outer ends of the two rectangular shells 3 are integrally formed with mounting plates 9, and the two mounting plates 9 are connected by bolts and nuts. A snap-in groove is provided on the right end face of the rear shell, and a snap-in rod 22 inserted into the snap-in groove is fixedly installed on the right end face of the front shell.

[0040] The installation of the front housing and the rear housing is completed by the cooperation of the mounting plate 9, bolts and nuts.

[0041] The clamping slot and clamping rod 22 are provided to enable the right ends of the front housing and the rear housing to be tightly mounted.

[0042] Specifically, if Figure 1 and Figure 2 As shown, the outer surfaces of the two rectangular shells 3 are symmetrically provided with slide grooves 31 , and the front and rear ends of the T-shaped rod 8 respectively pass through the slide grooves 31 .

[0043] from Figure 3 The specific shape of the T-shaped rod 8 can be seen in the figure. It has three ends: front, rear and right. The slide groove 31 is set to limit the moving path and position of the T-shaped rod 8. In addition, the movement of the T-shaped rod 8 can be completed by pinching the front and rear ends of the T-shaped rod 8, thereby realizing the rotation of the rotating drum 4.

[0044] Specifically, if Figure 1 and Figure 2As shown, a static slide groove 32 is opened at the lower end of the left surface of the inner cavity of the slide groove 31 , and the width of the static slide groove 32 is greater than the depth of the outer guide groove 41 .

[0045] A plurality of T-shaped rods 8 can be arranged in the rectangular shell 3. When one T-shaped rod 8 moves to the lowermost position of the rotating drum 4, another T-shaped rod 8 above can be moved downward and moved into the outer guide groove 41. Then, the lower T-shaped rod 8 moves outward to the static slide groove 32. The rotating drum 4 can be driven to rotate again by the upper T-shaped rod 8, and the probe connecting rod 5 and the positioning rod 6 can be continuously moved. This is suitable for situations where the pipe diameter is larger.

[0046] Specifically, if Figure 2 and Figure 3 As shown, an auxiliary positioning block 53 symmetrically distributed with the probe moving block 52 is fixedly mounted on the outer surface of the probe connecting rod 5 , and the auxiliary positioning block 53 is in contact with the inner surface of the rotating drum 4 .

[0047] The auxiliary positioning block 53 is used to assist in defining the position of the probe connecting rod 5 so as to keep it in a vertical state without tilting.

[0048] Specifically, if Figure 2 and Figure 3 As shown, positioning grooves 43 are provided at both upper and lower ends of the outer surface of the rotating drum 4, and the depth of the positioning grooves 43 is less than the depth of the outer guide grooves 41, and a rotating drum positioning plate 7 is symmetrically inserted into the positioning grooves 43 front and back, and a mounting block 71 is fixedly installed in the middle of the outer arc surface of the rotating drum positioning plate 7, and the mounting block 71 is fixedly installed on the shell 2 by screws, and the screws pass through the mounting block 71 and the rotating drum positioning plate 7, and a disc spring is arranged between the nut of the screw and the shell 2.

[0049] There are small gaps between the inner arc surface of the drum positioning plate 7 and the outer peripheral surface of the drum 4 , and between the outer end of the mounting block 71 and the inner wall of the shell 2 .

[0050] The drum positioning plates 7 on the upper and lower sides are placed in the positioning grooves 43 to limit the position of the drum 4. When there is a gap between the inner arc surface of the drum positioning plates 7 and the outer peripheral surface of the drum 4, the drum positioning plates 7 will not affect the rotation of the drum 4.

[0051] The end of the screw is a flat head.

[0052] The position of the drum positioning plate 7 is fixed by screws. When all the screws are inserted into the drum positioning plate 7 and the mounting block 71 and the disc spring is not subjected to pressure, continue to tighten the screws to compress the disc spring to generate pressure, which cooperates with the mounting block 71 on the inside to fix the position of the drum positioning plate 7.

[0053] Continuing to tighten the screw will continue to compress the disc spring, and eventually the end of the screw will completely penetrate the drum positioning plate 7 and squeeze on the drum 4, making the drum 4 unable to rotate, thereby fixing the positions of the probe connecting rod 5 and the positioning rod 6.

[0054] Specifically, if Figure 3 As shown, the positioning rod 6 is located between the right end surfaces of the front and rear drum positioning plates 7, and the front and rear surfaces of the positioning rod 6 are symmetrically provided with limiting grooves 63, and the right end surface of the drum positioning plate 7 is fixedly installed with a limiting block 72 inserted into the limiting groove 63.

[0055] By setting the limiting groove 63 and the limiting block 72, the position and movement direction of the positioning rod 6 can be limited to ensure that the positioning rod moving block 62 is located in the outer guide groove 41 and the positioning rod 6 moves in a straight line.

[0056] Specifically, if Figure 1 As shown, the middle of the outer arc surface of the front shell and the rear shell are provided with a drum positioning plate mounting groove 23 on both upper and lower sides, and the screws penetrate the drum positioning plate mounting groove 23 and are screwed onto the mounting block 71 .

[0057] After loosening the screws until the disc spring is no longer under stress, the drum positioning plate 7 can be moved up and down, thereby adjusting the position of the drum 4, and finally adjusting the positions of the aligned probe 51 and pad 61 to ensure that the probe 51 and pad 61 are located at the uppermost position of the inner wall of the pipe.

[0058] After adjusting the position of the drum 4, tighten the screws and use the elastic force of the disc spring to fix the position of the drum positioning plate 7.

[0059] Specifically, if Figure 2 As shown, a cushion block 61 is fixedly mounted on the lower end of the positioning rod 6 .

[0060] The cushion block 61 can prevent the lower end of the positioning rod 6 from causing damage to the inner wall of the pipeline.

[0061] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, many changes can be made in the specific implementation methods and application scopes based on the ideas of the present invention. As long as these changes do not deviate from the concept of the present invention, they all belong to the protection scope of the present invention.

Claims

1. A thermal resistor with adjustable measuring end position, characterized in that: It comprises a thermal resistor junction box, a shell, a rotating drum, a probe connecting rod and a positioning rod, wherein the shell is fixedly mounted on the lower end of the thermal resistor junction box, the rotating drum is rotatably assembled in the shell, a probe is fixedly mounted on the lower end of the probe connecting rod, the probe connecting rod and the positioning rod are both movably assembled in the shell, an outer guide groove is provided on the outer surface of the rotating drum, and there are two outer guide grooves in total, the two outer guide grooves are arranged in a double helix shape, an inner guide groove is provided on the inner surface of the rotating drum, and the stroke of the outer guide groove is twice the stroke of the inner guide groove when the rotating drum rotates one circle, a probe moving block plugged into the inner guide groove is fixedly mounted on the outer surface of the probe connecting rod, and a positioning rod moving block plugged into the outer guide groove is fixedly mounted on the inner end surface of the positioning rod; The shell is composed of a front shell and a rear shell, and the left ends of the front shell and the rear shell are integrally formed with a rectangular shell. The inner surface of the rectangular shell is movably equipped with a T-shaped rod, and the inner end of the T-shaped rod is fixedly installed with a T-shaped rod moving block inserted in the outer guide groove.

2. A thermal resistor with adjustable measuring end position according to claim 1, characterized in that: A connecting rod is fixedly installed on the lower side of the inner surface of the shell, and a guide ring is fixedly installed on the inner end of the connecting rod, and the probe connecting rod passes through the guide ring. A through groove is opened on the outer surface of the probe connecting rod, and an anti-rotation block inserted in the through groove is fixedly installed on the inner surface of the guide ring.

3. A thermal resistor with adjustable measuring end position according to claim 1, characterized in that: The outer ends of the two rectangular shells are integrally formed with mounting plates, and the two mounting plates are connected by bolts and nuts. The right end face of the rear shell is provided with a snap-in groove, and the right end face of the front shell is fixedly installed with a snap-in rod inserted into the snap-in groove.

4. A thermal resistor with adjustable measuring end position according to claim 1, characterized in that: The outer surfaces of the two rectangular shells are symmetrically provided with sliding grooves, and the front and rear ends of the T-shaped rod respectively penetrate the sliding grooves.

5. A thermal resistor with adjustable measuring end position according to claim 4, characterized in that: A static sliding groove is provided at the lower end of the left surface of the inner cavity of the sliding groove, and the width of the static sliding groove is greater than the depth of the outer guiding groove.

6. A thermal resistor with adjustable measuring end position according to claim 1, characterized in that: An auxiliary positioning block symmetrically distributed with the probe moving block is fixedly installed on the outer surface of the probe connecting rod, and the auxiliary positioning block is fitted to the inner surface of the rotating drum.

7. The thermal resistor with adjustable measuring end position according to claim 1, characterized in that: The outer surface of the rotating drum is provided with positioning grooves at both upper and lower ends, and the depth of the positioning grooves is less than the depth of the outer guide grooves, and a rotating drum positioning plate is symmetrically inserted into the positioning grooves front and back, and a mounting block is fixedly installed in the middle of the outer arc surface of the rotating drum positioning plate, and the mounting block is fixedly installed on the shell by screws, and the screws pass through the mounting block and the rotating drum positioning plate, and a disc spring is arranged between the nut of the screw and the shell.

8. A thermal resistor with adjustable measuring end position according to claim 7, characterized in that: The positioning rod is located between the right end surfaces of the front and rear drum positioning plates. The front and rear surfaces of the positioning rod are symmetrically provided with limiting grooves. The right end surface of the drum positioning plate is fixedly mounted with a limiting block inserted into the limiting groove.

9. The thermal resistor with adjustable measuring end position according to claim 7, characterized in that: The upper and lower sides of the middle of the outer arc surface of the front shell and the rear shell are both provided with a rotating drum positioning plate mounting groove, and the screws penetrate the rotating drum positioning plate mounting groove and are screwed on the mounting block.

10. The thermal resistor with adjustable measuring end position according to claim 1, characterized in that: A cushion block is fixedly mounted on the lower end of the positioning rod.

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