Vibration-resistant temperature sensor with high temperature measurement accuracy and its set

Abstract

The present invention discloses a vibration-resistant temperature sensor with high temperature measurement accuracy and a set thereof, comprising an armored cable protection tube, a temperature measuring element fixed at the head end of the armored cable protection tube, a cold end armor fixed at the tail end of the armored cable protection tube, and a lead wire having one end electrically connected to the temperature measuring element and the other end passing through the armored cable protection tube and then passing out of the cold end armor, wherein: a positioning ring is fixed on the armored cable protection tube, one or more anti-vibration sheets are fixed on the armored cable protection tube at the front end of the positioning ring, a movable ferrule sliding therewith is provided on the armored cable protection tube between the positioning ring and the cold end armor, an external thread is provided on the outer wall of the movable ferrule to connect the temperature measuring sleeve, a positioning groove is provided in the movable ferrule, and when the movable ferrule is moved axially, the positioning flange at the rear end of the positioning ring is closely fitted with the positioning groove to form axial positioning. The present invention has good vibration-resistant function and high measurement accuracy.

Description

Technical Field

[0001] The invention relates to the technical field of measuring instruments, and in particular to a vibration-resistant temperature sensor with high temperature measurement accuracy and a set thereof. Background Art

[0002] Thermal resistor temperature sensors are widely used in temperature measurement systems in various fields due to their high measurement accuracy, ease of use, and accurate correspondence between resistance signals and temperature. They are the most commonly used temperature measurement products. However, most thermal resistor temperature sensors in the prior art are directly fixed on the device under test, which has the disadvantage of poor vibration resistance and is not suitable for harsh environments such as vibration occasions. In addition, when the thermal resistor temperature sensor is screwed in and installed, the lead wire rotates with the sensor body, which will cause the lead wire to be entangled. Summary of the invention

[0003] The purpose of the present invention is to provide a vibration-resistant temperature sensor with high temperature measurement accuracy to solve the problems that the temperature sensor in the prior art is not suitable for vibration environments and the lead wires are easily entangled during assembly.

[0004] Another object of the present invention is to provide a set consisting of the vibration-resistant temperature sensor with high temperature measurement accuracy and a temperature measuring sleeve.

[0005] The technical solution adopted to achieve the purpose of the present invention is:

[0006] A vibration-resistant temperature sensor with high temperature measurement accuracy comprises an armored cable protection tube, a temperature measuring element fixed at the head end of the armored cable protection tube, a cold end armor fixed at the tail end of the armored cable protection tube, and a lead wire whose one end is electrically connected to the temperature measuring element and the other end passes through the armored cable protection tube and then passes through the cold end armor, wherein:

[0007] A positioning ring is fixed on the armored cable protection tube, and one or more anti-vibration sheets are fixed on the armored cable protection tube at the front end of the positioning ring. Each anti-vibration sheet is arranged in the length direction of the armored cable protection tube, and both ends of each anti-vibration sheet are fixed on the armored cable protection tube, and an elastic protrusion is formed in the middle;

[0008] An active sleeve is provided on the armored cable protection tube between the positioning ring and the cold end armor, and an external thread is provided on the outer wall of the active sleeve to connect the temperature measuring sleeve. A positioning groove is provided in the active sleeve. When the active sleeve is moved axially, the positioning flange at the rear end of the positioning ring is tightly fitted with the positioning groove to form axial positioning.

[0009] In the above technical solution, two or three anti-vibration plates are provided, and the anti-vibration plates are symmetrically arranged in a ring matrix.

[0010] In the above technical solution, the anti-vibration sheet is welded to the armored cable protection tube, the positioning ring is welded to the armored cable protection tube, and the diameter of the positioning ring is larger than the diameter of the armored cable protection tube.

[0011] In the above technical solution, the temperature measuring element is a paired platinum resistor, and insulating material is filled between the platinum resistor and the armored cable protection tube.

[0012] In the above technical solution, the insulating material is magnesium oxide.

[0013] In the above technical solution, an anti-bending spring is provided on the outer sleeve of the position where the lead wire is connected to the cold end armor.

[0014] In the above technical solution, the movable ferrule includes a front cylindrical section and a rear cylindrical section in an integrated structure, and the external thread is arranged on the outer wall of the front cylindrical section.

[0015] In the above technical solution, a stepped channel is formed inside the movable ferrule, a large diameter section of the stepped channel forms the positioning groove, and a small diameter section of the stepped channel is slidably connected to the armored cable protection tube.

[0016] In the above technical solution, the diameter of the cold end armor is larger than the diameter of the armored cable protection tube, and a transition section is provided at the position where the two are connected. The diameter of the transition section is larger than the diameter of the armored cable protection tube and smaller than the diameter of the cold end armor. The diameter of the transition section is larger than the inner diameter of the small diameter section to limit the position of the movable ferrule.

[0017] Another aspect of the present invention is a vibration-resistant temperature sensor set with high temperature measurement accuracy, comprising the vibration-resistant temperature sensor with high temperature measurement accuracy and a temperature measuring sleeve, the temperature measuring sleeve being provided with an internal thread matching the external thread of the movable ferrule, when the vibration-resistant temperature sensor with high temperature measurement accuracy is inserted into the movable ferrule, the vibration-resistant sheet is deformed and fits tightly to the inner wall of the temperature measuring sleeve.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. This device has good positioning function: radial positioning is performed by using anti-vibration sheets, and axial positioning is performed by using the cooperation of movable ferrules and positioning rings. The insertion depth and position of the temperature sensor can be accurately controlled, thereby improving the accuracy of the measurement.

[0020] 2. This device has good anti-vibration performance: the setting of the elastic anti-vibration sheet has good anti-vibration function. The use of armored cable as a protective tube and high-purity magnesium oxide as an insulating material also has good anti-vibration function. In addition, the diameter of the fixing ring is thickened at this position to reduce the amplitude of the sensor and improve the anti-vibration performance.

[0021] 3. Use the movable ferrule and the temperature measuring sleeve to form an assembly. When fixed, you only need to rotate the positioning ferrule without rotating the temperature sensor. This makes installation more convenient and avoids the lead wire from rotating with the temperature sensor to cause entanglement and twisting. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The figure shows a schematic diagram of the structure of a vibration-resistant temperature sensor with high temperature measurement accuracy (an anti-vibration sheet is installed in the figure).

[0023] Figure 2 It is a structural diagram of the movable card sleeve, where A is a three-dimensional structural diagram, B is the main view, and C is a cross-sectional view of the AA surface in B.

[0024] In the figure: 1-lead, 2-anti-bending spring, 3-cold end armor, 4-armored cable protection tube, 5-movable ferrule, 6-positioning ring, 7-anti-vibration sheet, 8-insulating material, 9-temperature measuring element, 10-positioning groove, 11-positioning flange, 12-front cylindrical section, 13-rear column section, 14-small diameter section, 15-transition section. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0026] Example 1

[0027] A vibration-resistant temperature sensor with high temperature measurement accuracy, comprising an armored cable protection tube 4, a temperature measuring element 9 fixed at the head end of the armored cable protection tube 4, a cold end armor 3 fixed at one end of the armored cable protection tube 4, and a lead 1 with one end electrically connected to the temperature measuring element 9 and the other end passing through the armored cable protection tube 4 and out of the cold end armor 3, wherein:

[0028] A positioning ring 6 is fixed on the armored cable protection tube 4, and one or more anti-vibration sheets 7 are fixed on the armored cable protection tube 4 at the front end of the positioning ring 6. Each anti-vibration sheet 7 is arranged in the length direction of the armored cable protection tube 4, and both ends of each anti-vibration sheet 7 are fixed on the armored cable protection tube 4, and an elastic protrusion is formed in the middle;

[0029] The armored cable protection tube 4 at the rear end of the positioning ring 6 is provided with a movable sleeve 5 that slides therewith, and the outer wall of the movable sleeve 5 is provided with an external thread to connect the temperature measuring sleeve. A positioning groove 10 is provided in the movable sleeve 5. When the movable sleeve 5 is moved axially, the positioning flange 11 at the rear end of the positioning ring 6 fits with the positioning groove 10.

[0030] Installation method of the temperature sensor:

[0031] First, a temperature measuring sleeve is installed at the industrial temperature measurement site. When the device is inserted into the temperature measuring sleeve, the elastic protrusion of each anti-vibration piece 7 is deformed by force, so that the temperature sensor and the inner wall of the sleeve are closely matched, and the device is radially positioned, thereby achieving the effect of anti-vibration and improving measurement accuracy. At the same time, the requirements for the inner diameter processing accuracy of the temperature measuring sleeve are also reduced, thereby reducing the cost.

[0032] On the other hand, when the temperature measuring sleeve is inserted, the external thread of the movable ferrule 5 is threadedly connected with the internal thread of the temperature measuring sleeve. When the movable ferrule 5 is rotated, it approaches the positioning ring 6 in the axial direction until the positioning flange 11 of the positioning ring 6 enters the positioning groove 10 and fits tightly on the positioning groove 10, so as to axially position the device. The positioning ring 6 not only accurately determines the insertion depth, but also thickens the diameter of this position, reduces the amplitude of the sensor, and improves the vibration resistance. The setting of the movable ferrule 5 makes it more convenient to install and fix and avoids the lead wire from rotating with the sensor to cause winding and twisting.

[0033] Example 2

[0034] Preferably, there are two or three anti-vibration sheets 7. The anti-vibration sheets 7 are arranged in a ring matrix. When there are two anti-vibration sheets 7, they are arranged oppositely on the outer surface of the armored cable protection tube 4. When there are three anti-vibration sheets 7, the angle between each two anti-vibration sheets 7 is 120°.

[0035] Preferably, the anti-vibration sheet 7 is welded to the armored cable protection tube 4, and the positioning ring 6 is welded to the armored cable protection tube 4. The diameter of the positioning ring 6 is greater than the diameter of the armored cable protection tube 4.

[0036] Preferably, the temperature measuring element 9 is a paired platinum resistor, and further, an insulating material 8 is filled between the platinum resistor and the armored cable protection tube 4. The high-precision platinum resistor temperature measuring element ensures measurement accuracy, and the insulating material 8 is made of magnesium oxide. The temperature measuring element is placed in the armored cable protection tube 4 and high-purity magnesium oxide is used to fill the gap to ensure insulation and vibration resistance. The temperature measurement range of this device is -30 to 300 ° C.

[0037] Preferably, an anti-bending spring 2 is provided on the position where the lead wire 1 is connected to the cold end armor 3. The anti-bending spring 2 reduces the bending arc between the lead wire 1 and the cold end armor 3, reduces the stress, and improves the reliability of the product.

[0038] Preferably, the movable ferrule 5 comprises a front cylindrical section 12 and a rear cylindrical section 13 in an integrated structure, and the external thread is arranged on the outer wall of the front cylindrical section 12. The rear cylindrical section 13 is easy to rotate and is convenient and quick to use.

[0039] Preferably, a stepped channel is formed inside the movable ferrule 5 , a large diameter section of the stepped channel forms the positioning groove 10 , and a small diameter section 14 of the stepped channel is slidably connected to the armored cable protection tube 4 .

[0040] Preferably, the diameter of the cold end armor 3 is larger than the diameter of the armored cable protection tube 4, and a transition section 15 is provided at the connection position between the two. The diameter of the transition section 15 is larger than the diameter of the armored cable protection tube 4 and smaller than the diameter of the cold end armor. The diameter of the transition section 15 is larger than the inner diameter of the small diameter section 14 to limit the position of the movable sleeve 5.

[0041] Example 3

[0042] A vibration-resistant temperature sensor set with high temperature measurement accuracy comprises the vibration-resistant temperature sensor with high temperature measurement accuracy and a temperature measuring sleeve as described in Example 1. The temperature measuring sleeve is provided with an internal thread matching the external thread of the movable ferrule 5, and when the vibration-resistant temperature sensor with high temperature measurement accuracy is inserted into the movable ferrule 5, the vibration-resistant sheet 7 is deformed and closely fits the inner wall of the temperature measuring sleeve.

[0043] For ease of explanation, spatial relative terms such as "upper", "lower", "left", "right" and the like are used in the embodiments to illustrate the relationship of one element or feature shown in the figure relative to another element or feature. It should be understood that, in addition to the orientation shown in the figure, the spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figure is inverted, the element described as being "under" other elements or features will be positioned "on" other elements or features. Therefore, the exemplary term "under" can include both upper and lower orientations. The device can be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used here can be interpreted accordingly.

[0044] Furthermore, relational terms such as “first” and “second” and the like are merely used to distinguish one component from another having the same name, but do not necessarily require or imply any such actual relationship or order between these components.

[0045] The above description is only a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements can be made without departing from the principle of the present invention, and these improvements should also be regarded as the scope of protection of the present invention.

Claims

1. A vibration-resistant temperature sensor with high temperature measurement accuracy, characterized in that: The invention comprises an armored cable protection tube (4), a temperature measuring element (9) fixedly mounted at the head end of the armored cable protection tube (4), a cold end armor (3) fixedly mounted at the tail end of the armored cable protection tube (4), and a lead wire (1) having one end electrically connected to the temperature measuring element (9) and the other end passing through the armored cable protection tube (4) and then passing through the cold end armor (3), wherein: A positioning ring (6) is fixed on the armored cable protection tube (4), and one or more anti-vibration plates (7) are fixed on the armored cable protection tube (4) at the front end of the positioning ring (6). Each anti-vibration plate (7) is arranged in the length direction of the armored cable protection tube (4), and both ends of each anti-vibration plate (7) are fixed on the armored cable protection tube (4), and an elastic protrusion is formed in the middle; An armored cable protection tube (4) between the positioning ring (6) and the cold end armor (3) is provided with a movable sleeve (5) that slides therewith, an outer wall of the movable sleeve (5) is provided with an external thread for connecting to a temperature measuring sleeve, and a positioning groove (10) is provided in the movable sleeve (5). When the movable sleeve (5) is axially moved, a positioning flange (11) at the rear end of the positioning ring (6) is tightly fitted with the positioning groove (10) to form axial positioning; The movable ferrule (5) comprises a front cylindrical section (12) and a rear cylindrical section (13) in an integrated structure, and the outer wall of the front cylindrical section (12) is provided with the external thread; A stepped channel is formed inside the movable ferrule (5), a large diameter section of the stepped channel forms the positioning groove (10), and a small diameter section (14) of the stepped channel is slidably connected to the armored cable protection tube (4); The anti-vibration sheets (7) are provided with two or three pieces, and the anti-vibration sheets (7) are symmetrically arranged in a ring-shaped matrix.

2. The vibration-resistant temperature sensor with high temperature measurement accuracy according to claim 1, characterized in that: The anti-vibration sheet (7) is welded to the armored cable protection tube (4), the positioning ring (6) is welded to the armored cable protection tube (4), and the diameter of the positioning ring (6) is greater than the diameter of the armored cable protection tube (4).

3. The vibration-resistant temperature sensor with high temperature measurement accuracy according to claim 1, characterized in that: The temperature measuring element (9) is a paired platinum resistor, and an insulating material (8) is filled between the platinum resistor and the armored cable protection tube (4).

4. The vibration-resistant temperature sensor with high temperature measurement accuracy according to claim 3, characterized in that: The insulating material (8) is magnesium oxide.

5. The vibration-resistant temperature sensor with high temperature measurement accuracy according to claim 1, characterized in that: An anti-bending spring (2) is provided on the outer sleeve of the position where the lead wire (1) is connected to the cold end armor (3).

6. The vibration-resistant temperature sensor with high temperature measurement accuracy according to claim 5, characterized in that: The diameter of the cold end armor (3) is larger than the diameter of the armored cable protection tube (4), and a transition section (15) is provided at the position where the two are connected. The diameter of the transition section (15) is larger than the diameter of the armored cable protection tube (4) but smaller than the diameter of the cold end armor (3). The diameter of the transition section (15) is larger than the inner diameter of the small diameter section (14) to limit the position of the movable sleeve (5).

7. A vibration-resistant temperature sensor set with high temperature measurement accuracy, characterized in that: It comprises a vibration-resistant temperature sensor with high temperature measurement accuracy and a temperature measuring sleeve as described in any one of claims 1 to 6, wherein the temperature measuring sleeve is provided with an internal thread matching the external thread of the movable sleeve (5), and when the vibration-resistant temperature sensor with high temperature measurement accuracy is inserted into the movable sleeve (5), the vibration-resistant sheet (7) is deformed and fits tightly to the inner wall of the temperature measuring sleeve.

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