CN204479196U - Sensor card gripping members, sensor module and transmitter - Google Patents

Abstract

The utility model discloses a sensor clamping part, a sensor assembly and a transmitter. The sensor clamping part comprises: a conical tube-shaped clamping part, the outer surface of the clamping part has threads, and the clamping part has two first slits extending along its axial direction; and a circular tube-shaped base part, The base part is formed coaxially and integrally with the clamping part, wherein the sensor clamping part has a through-hole which axially passes through the clamping part and the base part and whose diameter is larger than that of the sensor. The sensor assembly includes: a sensor; a sensor clamp for clamping the sensor; and a thermowell for accommodating a portion of the sensor, the thermowell has an open end and a closed end, the thermowell is adjacent to the The inner surface of the portion of the open end has threads mating with the threads on the outer surface of the gripping portion. The transmitter includes a housing and the sensor assembly, wherein the sensor assembly is secured to the housing by threads on an outer surface of an end portion of an extension that it includes.

Description

Sensor clamps, sensor assemblies and transmitters

technical field

The utility model generally relates to the field of measurement. Specifically, the utility model relates to a sensor clamping part for clamping a sensor, a sensor assembly with the sensor clamping part, and a transmitter with the sensor assembly.

Background technique

This section provides background information related to the present disclosure which is not necessarily prior art.

The transmitter is a device that converts the sensed physical quantity, chemical quantity and other information into a standardized signal that is convenient for measurement and transmission according to certain rules. It is an integral part of the unit combination instrument. Transmitters can be used to measure parameters such as pressure, temperature, flow, and liquid level. The sensor is the core component of the transmitter, which can sense various parameters of the measured medium and convert them into usable output signals, so as to realize various measurements.

As an example of a sensor, a temperature sensor is used in the field of temperature measurement. In a temperature measuring instrument, a protective device such as a protective sleeve is usually used to accommodate the temperature sensor, thereby isolating the medium to be measured and protecting the internal temperature sensor. However, the temperature sensor components currently used in temperature measuring instruments are usually complicated in manufacturing process and inconvenient to assemble. Therefore, how to design a temperature sensor assembly that is easy to manufacture and can be conveniently assembled is a technical problem that needs to be solved urgently in this field. The same or similar issues exist for other types of sensor assemblies and transmitters.

Utility model content

This section provides a general summary of the disclosure, not a comprehensive disclosure of its full scope or all of its features.

In view of this, the utility model proposes a sensor clamping part with a simpler structure, a sensor assembly with the sensor clamping part, and a transmitter with the sensor assembly.

According to the utility model, the structure of the sensor assembly with the sensor clamping part is more compact. In addition, the assembly process of the sensor assembly with the sensor clamping part according to the present invention is simpler. In addition, the cost of the sensor assembly according to the invention with the sensor clamping part is also lower.

According to one aspect of the present invention, a sensor clamping part is provided. The clamping part of the sensor includes: a clamping part, the clamping part is in the shape of a conical tube, the outer surface of the clamping part has threads, and the clamping part has an axial extension along the clamping part the two first cutouts; and a base, which is in the shape of a round tube and integrally formed with the clamping part, the base and the clamping part are coaxial, wherein the sensor clamp A through hole with a diameter larger than that of the sensor is provided axially through the clamping portion and the base portion.

Optionally, the base has two second cutouts at the end of the base on a side away from the clasping portion.

Optionally, the two first slits are located in two radial directions perpendicular to each other of the clasping portion.

Optionally, the two second cutouts are located in two radial directions perpendicular to each other of the base.

Optionally, the length of the clinging portion is greater than the length of the base portion.

Optionally, the outer diameter of the clinging portion gradually decreases toward a direction away from the base, and the outer diameter of the base is larger than the maximum outer diameter of the clinging portion.

Optionally, said two first cuts have equal depth and width, and said two second cuts have equal depth and width.

Optionally, the sensor clamping member is made of stainless steel.

According to another aspect of the present invention, a sensor assembly is provided. The sensor assembly includes: a sensor; the above-mentioned sensor clamping member for clamping the sensor; and a thermowell for accommodating a part of the sensor, the thermowell has an open end and a closed end, the proximity of the thermowell The inner surface of the part of the open end has a screw thread matched with the screw thread on the outer surface of the clamping part.

Optionally, the sensor assembly further includes: an extension for accommodating the rest of the sensor, the extension is in the shape of a round tube and has threads on the outer surfaces of both ends thereof; and the thermal There are threads on the inner surface of the open end of the sleeve, and the threads on the outer surface of one end of the extension cooperate with the threads on the inner surface of the open end of the thermowell.

Optionally, the sensor is clamped to the portion of the thermowell proximate its open end by the sensor clamp.

Optionally, the tip of the sensor is arranged in contact with the closed end of the thermowell.

Optionally, the thermowell is made of stainless steel, and the extension is made of stainless steel.

According to a specific example of the present invention, the sensor is a thermocouple, and the sensor component is a temperature sensor component.

According to yet another aspect of the utility model, a transmitter is provided. The transmitter includes: a housing; and the above-mentioned sensor assembly. Wherein the sensor assembly is secured to the housing by threads on the outer surface of the other end of the extension.

According to a specific example of the present invention, the sensor assembly is a temperature sensor assembly, and the transmitter is a temperature transmitter.

The sensor clip according to the invention has a relatively simple structure. Furthermore, the sensor assembly with the sensor clamp has the advantages of a more compact structure and a simpler assembly process. Furthermore, the sensor assembly with the sensor clamp, and thus the transmitter with the sensor assembly, has lower costs.

Further areas of applicability will become apparent from the description provided herein. The description and specific examples in this summary are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure.

Description of drawings

Read the exemplary embodiment of the utility model with reference to the accompanying drawings, and it will be easier to understand other features and advantages of the utility model. The accompanying drawings described here are only for the purpose of schematically illustrating the utility model embodiment, not All possible implementations are included and are not intended to limit the scope of the present invention. In the attached picture:

FIG. 1 is a schematic cross-sectional view showing a spring-type temperature sensor assembly.

Fig. 2a is a schematic perspective view showing a thermocouple clamp according to an exemplary embodiment of the present invention.

Fig. 2b is a schematic longitudinal sectional view showing a thermocouple clamp according to an exemplary embodiment of the present invention.

Fig. 2c is a schematic cross-sectional view showing a thermocouple clamp according to an exemplary embodiment of the present invention.

3 is a schematic cross-sectional view illustrating a temperature sensor assembly with a thermocouple clamp according to an exemplary embodiment of the present invention.

FIG. 4 is a schematic assembly diagram showing a temperature transmitter according to an exemplary embodiment of the present invention.

Detailed ways

Embodiments of the utility model are now described in detail with reference to the accompanying drawings. It should be noted that the following description is only exemplary and not intended to limit the present invention, and for the sake of brevity, specific descriptions of some components and steps that are the same as those in the prior art are omitted in the following description. Also, in the following description, the same reference numerals will be used to designate the same or similar components in different drawings. Different features in the embodiments described below can be combined with each other to form other embodiments within the scope of the invention.

As an example of a sensor, a thermocouple (thermocouple) is a commonly used temperature measuring element, which directly measures temperature and converts the temperature signal into a thermoelectromotive force signal, and then converts the thermoelectromotive force signal into the temperature of the measured medium. A temperature sensor assembly with a thermocouple is widely used in the field of temperature measurement, especially for temperature measurement used in industrial field control.

Next, in this specification, a thermocouple will be described as an example of a sensor. However, the present invention is not limited thereto. For example, thermocouples can be replaced not only with various other temperature measuring elements capable of measuring temperature, but also with various corresponding measuring elements capable of measuring other physical quantities, as long as these measuring elements have similar structures to thermocouples .

Typically, the temperature sensor assembly with a thermocouple is a spring type temperature sensor assembly. FIG. 1 is a schematic cross-sectional view showing a spring-type temperature sensor assembly. As shown in FIG. 1 , the spring-type temperature sensor assembly 100 includes a clamping member 110 , a thermocouple 120 in the shape of an elongated rod, and a thermowell 130 with an open end and a closed end. The clip 110 includes a clip body 111 , a spring 112 , and washers 113 and 114 . The clip body 111 has two coaxial but different diameter cylindrical holes communicating with each other. The spring 112 and the washers 113 and 114 are disposed in the larger diameter cylindrical bore. Both ends of the clip body 111 have cylindrical threads on the outer surfaces. The cylindrical thread on the outer surface of one end of the clip body 111 is matched with the cylindrical thread on the housing (not shown here) of the temperature transmitter, so that the clip body 111 is fixed to the temperature transmitter. shell. The cylindrical threads on the outer surface of the other end of the clip body 111 cooperate with the cylindrical threads on the inner surface of the open end of the thermowell 130 so that the clip body 111 is fixed to the thermowell 130 . When the spring-type temperature sensor assembly 100 is assembled, the tip of the thermocouple 120 is in contact with the closed end of the thermowell 130 .

When assembling the spring-type temperature sensor assembly 100, the spring 112 is arranged between the washers 114 and 113 and inserted together into a cylindrical hole with a larger diameter. Then, the opposite end of the thermocouple 120 is inserted into and passes through the smaller diameter cylindrical hole of the clamp body 111, passes through the washer 113 and enters the inside of the spring 112, so that the thermocouple 120 is held by the clamp 110 . Then, by screwing the cylindrical thread on the outer surface of the other end of the clamp body 111 onto the cylindrical thread on the inner surface of the open end of the thermowell 130, the clamp 110 holding the thermocouple 120 is secured to the thermowell 130. At this time, the elastic force of the spring 112 makes the tip of the thermocouple 120 contact the closed end of the thermowell 130 , so that the thermocouple can sense the temperature of the measured medium.

According to the above description, since the clamping member 110 has many parts such as the spring 112 and the washers 113 and 114 and thus is structurally complicated, the assembly process of the spring type temperature sensor assembly 100 including the clamping member 110 is relatively complicated and higher cost. Therefore, there is a need for a temperature sensor assembly with a more compact structure, simpler assembly process, and lower cost.

Fig. 2a is a schematic perspective view showing a thermocouple clamp 210 according to an exemplary embodiment of the present invention. Fig. 2b is a schematic longitudinal sectional view showing a thermocouple clamp 210 according to an exemplary embodiment of the present invention. Fig. 2c is a schematic cross-sectional view showing a thermocouple clamp 210 according to an exemplary embodiment of the present invention. Thermocouple clamp 210 is, for example, a sensor clamp. The thermocouple clamp 210 is made of metal material, preferably stainless steel material. As shown in FIGS. 2 a to 2 c , the thermocouple clamping member 210 is composed of a conical tube-shaped clamping portion 211 and a circular tube-shaped base portion 212 . The clasping portion 211 and the base portion 212 are integrally formed and coaxial. The length of the clasping portion 211 is generally greater than the length of the base portion 212 . The outer diameter of the conical tube-shaped clamping portion 211 gradually decreases toward the direction away from the base portion 212 . The outer diameter of the base portion 212 is generally constant and larger than the outer diameter of the end portion of the clinching portion 211 adjacent to the base portion 212 , ie, the maximum outer diameter of the clinching portion 211 . The thermocouple clamping part 210 has a through hole 216 axially penetrating through the clamping part 211 and the base part 212 , with a diameter larger than that of the thermocouple, so that the thermocouple can pass through the thermocouple clamping part 210 when assembling the temperature sensor assembly. The through hole 216 is generally a cylindrical through hole, that is, the clasping portion 211 and the base portion 212 have equal inner diameters.

As shown in Figures 2a and 2b, the outer surface of the remaining part of the clinging part 211 except the end adjacent to the base part 212 has a screw thread 213 that revolves along the axial direction of the clinging part 211, so that when the temperature sensor is assembled When assembled, the thermocouple clamp 210 can be secured to the thermowell and grip the thermocouple by a threaded fit as described below. Thread 213 is generally a conical thread. The clasping portion 211 has two first slits 214 and 214' extending along its axial direction. The cutouts 214 and 214' are respectively located in two radial directions perpendicular to each other of the clasping portion 211. Cuts 214 and 214' are generally of equal depth and width. The depth of cutouts 214 and 214' is generally slightly greater than the axial length of threads 213. The depth and width of the cutouts 214 and 214' are set so that the clasping portion 211 has desired flexibility, so that the clasping portion 211 can hug the thermocouple without damaging the thermocouple when the temperature sensor assembly is assembled.

As shown in Figures 2a and 2c, two cutouts 215 and 215' are provided at the end of the base portion 212 on the side away from the clasping portion 211. The cutouts 215 and 215' are located in two radial directions perpendicular to each other of the base 212, respectively. Slits 215 and 215' are generally of equal depth and width and extend generally axially of base 212. The depth and width of the cutouts 215 and 215' are set to enable the cutouts 215 and 215' to engage with an assembly tool. When assembling the temperature sensor assembly, the base 212 is screwed using the assembly tool so that the thermocouple clamp 210 can be secured to the thermowell and grip the thermocouple by a threaded fit as described below.

FIG. 3 is a schematic cross-sectional view illustrating a temperature sensor assembly 200 with a thermocouple clamp 210 according to an exemplary embodiment of the present invention. As shown in FIG. 3, a temperature sensor assembly 200 according to an exemplary embodiment of the present invention includes a thermocouple clamp 210, a thermocouple 220, a thermowell 230 for accommodating a part of the thermocouple 220, and a A tubular extension 240 that houses the remainder of the thermocouple 220 .

The thermocouple clamp 210 here has exactly the same structure as the thermocouple clamp 210 described above with reference to FIGS. structure, so their structure will not be repeated here.

The thermowell 230 is made of metallic material, preferably stainless steel material. Thermowell 230 houses a portion of thermocouple 220 including its tip. Similar to thermowell 130, thermowell 230 has an open end and a closed end. When the temperature sensor assembly 200 is assembled, the tip of the thermocouple 220 is in contact with the closed end of the thermowell 230 . The inner surface of the part of the thermowell 230 close to its open end has a screw thread that matches the screw thread 213 on the outer surface of the clasping portion 211 . The thread is wound in the axial direction of the thermowell 230 and is therefore coaxial with the thermowell 230 . Of the same type as thread 213, this thread is also generally a conical thread. The maximum diameter of the through hole formed by the threads is slightly smaller than the inner diameter of the open end of the thermowell 230 . When assembling the temperature sensor assembly 200, the thermocouple clamping member 210 including the clasping portion 211 is fixed to the portion of the thermowell 230 near its open end by screwing, and the clasping is partially accommodated in the thermowell. Thermocouple 220 inside tube 230 . Thus, the thermocouple 220 is clamped by the thermocouple clamping member 210 to the portion of the thermowell 230 close to its open end. The outer diameter of the open end of thermowell 230 is substantially equal to the outer diameter of extension 240 . The inner surface of the open end of the thermowell 230 has threads 231 wound along the axial direction of the open end of the thermowell 230 so that the thermowell 230 can be fixed to the extension 240 by screw fit. Thread 231 is generally a cylindrical thread.

The extension 240 is made of metal material, preferably stainless steel material. The extension 240 is preferably formed from tubing. The outer surfaces of both ends of the extension piece 240 have threads 241 that rotate along the axial direction of the extension piece 240 . Thread 241 is generally a cylindrical thread. Threads 241 on the outer surface of one end of the extension piece 240 cooperate with threads on the housing of the temperature transmitter (see FIG. 4 ), so that the extension piece 240 can be fixed to the housing of the temperature transmitter. The threads 241 on the outer surface of the other end of the extension 240 cooperate with the threads 231 on the inner surface of the open end of the thermowell 230, so that the extension 240 can be fixed to the open end of the thermowell 230 by threading. Ends.

FIG. 4 is a schematic assembly diagram showing a temperature transmitter according to an exemplary embodiment of the present invention. As shown in FIG. 4, the temperature transmitter includes a temperature sensor assembly 200 and a housing 250 containing the instrumentation. The instrumentation of the temperature transmitter is the electronic unit that converts the temperature signal of the temperature sensor assembly into a standardized output signal that can be transmitted. The temperature sensor assembly 200 is fixed to the housing 250 by threads 241 on the outer surface of the other end of the extension 240 thereof, and makes the temperature sensor assembly 200 electrically connected with the instrumentation of the temperature transmitter. The main assembly process of the temperature transmitter is as follows.

First, a part of the thermocouple 220 including its tip is inserted from the open end of the thermowell 230 so that the thermocouple 220 passes through the open end of the thermowell 230 and the part of the thermowell 230 near its open end. The threaded portion on the inner surface is advanced until the tip of the thermocouple 220 makes contact with the closed end of the thermowell 230 .

Then, the thermocouple clamp 210 is looped over the thermocouple 220 from the end of the thermocouple 220 opposite its tip (the end is not received in the thermowell 230), and the thermocouple clamp 210 is placed along the thermowell 220. The length of couple 220 travels past the open end of thermowell 230 to the portion of thermowell 230 that is threaded on the inner surface near its open end. Then, the base 212 of the thermocouple clamping part 210 is screwed with an assembly tool so that the threads on the outer surface of the gripping part 211 of the thermocouple clamping part 210 are screwed into the thermowell 230 near its open end. The threads of the part provided with threads on the inner surface, that is, the gripping portion 211 is threadedly engaged with the part of the thermowell 230 that is provided with threads on the inner surface near its open end. Since the clasping portion 211 has two radial cutouts 214 and 214 ′ extending along its axial direction and perpendicular to each other, the clasping portion 211 has a greater thickness than the part of the thermowell 230 that is threaded with the clasping portion 211 . Great flexibility. Therefore, when the base portion 212 is screwed, the clasping portion 211 is deformed and thus contracts radially inwards to hug the thermocouple 220 . As the base part 212 is continuously screwed, the clamping part 211 is deformed more and shrinks radially inward, so that the thermocouple 220 is hugged more tightly. Thus, thermocouple clamp 210 is secured to thermowell 230 and hugs thermocouple 220 .

Extension 240 is then looped over thermocouple 220 from the end of thermocouple 220 opposite its tip (the end that is not received in thermowell 230 ). Then, the thread 241 on the outer surface of one end of the extension 240 is screwed onto the thread on the housing 250 of the temperature transmitter, thereby fixing the extension 240 to the housing 250 of the temperature transmitter; and the extension Threads 241 on the outer surface of the other end of piece 240 are threaded onto threads 231 on the inner surface of the open end of thermowell 230 , thereby securing extension 240 to thermowell 230 .

Finally, the temperature sensor assembly 200 is fixed to the housing 250 through the thread 241 on the outer surface of the other end of the extension 240, and the temperature sensor assembly 200 is electrically connected with the instrumentation of the temperature transmitter. In this way, the assembly process of the temperature transmitter is completed.

According to the above detailed description, the thermocouple clamp according to the exemplary embodiment of the present invention has a relatively simple structure. Moreover, the temperature sensor assembly with the thermocouple clamp has the advantages of a more compact structure and a simpler assembly process. Furthermore, the temperature sensor assembly with the thermocouple clamp, and thus the temperature transmitter with the temperature sensor assembly, has a lower cost.

Above, the structure of the utility model has been briefly described with the sensor as the physical quantity measuring element. It should be pointed out here that the utility model is not limited to the sensor clamping part, the temperature sensor assembly with the sensor clamping part, and the temperature transmitter with the temperature sensor assembly described above, but various modifications can be made. For example, various corresponding measuring elements suitable for measuring other physical quantities may be substituted for the sensors, thereby constituting a corresponding sensor clamp, a sensor with the sensor clamp, and a transmitter with the sensor.

The above description of the embodiments of the utility model is for a better understanding of the utility model, and it is only exemplary rather than intended to limit the utility model. It should be noted that in the above description, features described and/or illustrated for one embodiment can be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments , or replace the features in other embodiments. Those skilled in the art should understand that without departing from the concept of the utility model, various changes and modifications made to the above-described embodiments all fall within the scope of the utility model.

Claims (16)

1. A sensor clamping part, characterized in that, the sensor clamping part comprises: A tightening part, the tightening part is in the shape of a conical tube, the outer surface of the tightening part has threads, and the tightening part has two first slits extending along the axial direction of the tightening part; as well as a base part, the base part is in the shape of a round tube and integrally formed with the clamping part, the base part and the clamping part are coaxial, Wherein, the sensor clamping member has a through hole axially penetrating through the clamping portion and the base portion and having a diameter larger than that of the sensor. 2 . The sensor clip according to claim 1 , wherein the base portion has two second cutouts at the end of the base portion on a side remote from the clasping portion. 3 . 3 . The sensor clip according to claim 1 , wherein the two first cutouts are respectively located in two radial directions perpendicular to each other of the clasping portion. 4 . 4 . The sensor clip according to claim 2 , wherein the two second cutouts are respectively located in two radial directions perpendicular to each other of the base. 5 . 5. The sensor clip according to claim 1, wherein the length of the gripping portion is greater than the length of the base portion. 6. The sensor clip according to claim 1, characterized in that, the outer diameter of the clamping portion gradually decreases toward a direction away from the base, and the outer diameter of the base is larger than the clamping portion The maximum outer diameter of the part. 7. The sensor clamp of claim 2, wherein the two first cutouts are of equal depth and width, and the two second cutouts are of equal depth and width. 8. The sensor clamping part according to any one of claims 1 to 7, characterized in that the sensor clamping part is made of stainless steel material. 9. A sensor assembly, characterized in that the sensor assembly comprises: sensor; a sensor clamp according to any one of claims 1-8 for clamping said sensor; and A thermowell for accommodating a portion of the sensor, the thermowell having an open end and a closed end, the inner surface of the portion of the thermowell proximate the open end having a Threads that mate with threads on the outer surface of the head. 10. The sensor assembly according to claim 9, further comprising: an extension for accommodating the remaining part of the sensor, the extension being in the shape of a round tube and at its two ends have threads on the outer surface; and It is characterized in that there are threads on the inner surface of the open end of the thermowell, and the threads on the outer surface of one end of the extension piece are connected with the threads on the inner surface of the open end of the thermowell. match. 11. The sensor assembly of claim 10, wherein the sensor is clamped by the sensor clamp to the portion of the thermowell proximate its open end. 12. The sensor assembly of claim 10, wherein the tip of the sensor is arranged in contact with the closed end of the thermowell. 13. The sensor assembly of claim 10, wherein the thermowell is made of a stainless steel material and the extension is made of a stainless steel material. 14. The sensor assembly according to any one of claims 9 to 13, wherein the sensor is a thermocouple, and the sensor assembly is a temperature sensor assembly. 15. A transmitter, characterized in that the transmitter comprises: casing; and A sensor assembly according to any one of claims 10-13, Wherein the sensor assembly is secured to the housing by threads on the outer surface of the other end of the extension. 16. The transmitter of claim 15, wherein the sensor assembly is a temperature sensor assembly, and the transmitter is a temperature transmitter.