Sensor

Abstract

A sensor disclosed by the present invention comprises a housing, an adapter, an isolation sleeve, a temperature sensing unit and a first sealing member, the housing comprises a temperature sensing channel, the isolation sleeve is at least partially located in the temperature sensing channel, the temperature sensing unit comprises a pin and a temperature sensing element, the pin is electrically connected with the temperature sensing element, and the first sealing member is electrically connected with the adapter. The temperature sensing element is located in an inner cavity of the isolation sleeve, the isolation sleeve comprises an open end and a closed end, the temperature sensing element is closer to the closed end than the open end, the adapter comprises a protruding part, the pin extends out of the protruding part, the pin extending out of the protruding part is located in the inner cavity of the isolation sleeve, the open end is sleeved with the protruding part, and the first sealing piece is sleeved with the protruding part. Or the first sealing piece is sleeved with an isolation sleeve, and the first sealing piece seals an inner cavity of the isolation sleeve. Through the arrangement of the isolation sleeve, the isolation between the pin of the temperature sensing unit and the measured fluid is realized, so that the risk of pin short circuit can be reduced.

Description

Technical Field

[0001] This invention relates to the field of sensing technology, and in particular to a sensor. Background Technology

[0002] Sensors are an important component in industrial automation control systems. They are used to sense the measured information and convert it into electrical signals or other required forms of output information according to certain rules. With the continuous development of science and technology, sensors are being used in more and more widespread areas of daily life.

[0003] Figure 1 This is a cross-sectional schematic diagram of a sensor provided for background art. In this structure, the sensor includes a temperature sensing device 01, which includes a temperature probe 011 and two pins 012 electrically connected to the temperature probe 011. In practical use, because the pins 012 are in direct contact with the medium, if conductive impurities are present in the medium, the pins 012 may short-circuit and fail, affecting the sensor's operational reliability. Summary of the Invention

[0004] To address the aforementioned problems, this application provides a sensor comprising: a housing, an adapter, an isolation sleeve, a temperature sensing unit, and a first sealing element. The housing includes a temperature sensing channel, and the isolation sleeve is at least partially located within the temperature sensing channel. The temperature sensing unit includes pins and a temperature sensing element, the pins being electrically connected to the temperature sensing element, the temperature sensing element being located within the inner cavity of the isolation sleeve. The isolation sleeve includes an open end and a closed end, the temperature sensing element being closer to the closed end than the open end. The adapter includes a protrusion, the pins extending from the protrusion, the pins extending from the protrusion being located within the inner cavity of the isolation sleeve, the open end being fitted over the protrusion, and the first sealing element fitting over the protrusion, or the first sealing element fitting over the isolation sleeve, the first sealing element sealing the inner cavity of the isolation sleeve.

[0005] This application achieves isolation between the pins of the temperature sensing unit and the fluid being measured by setting an isolation sleeve, with the protruding pins located inside the cavity of the isolation sleeve, the protruding pins covered by the isolation sleeve, and a first sealing member covering the protruding pins or the isolation sleeve, thereby reducing the risk of pin short circuits. Attached Figure Description

[0006] Figure 1 A cross-sectional schematic diagram of a sensor is provided for the background art;

[0007] Figure 2 A cross-sectional schematic diagram of a sensor provided by the present invention;

[0008] Figure 3 for Figure 2 Enlarged view of point X in the middle;

[0009] Figure 4 for Figure 2 A three-dimensional structural diagram of the middle shell;

[0010] Figure 5 for Figure 2 Exploded view of the transfer connector, temperature sensing unit, and isolation sleeve;

[0011] Figure 6 A partial cross-sectional schematic diagram of another sensor provided by the present invention;

[0012] Figure 7 This is a partial cross-sectional schematic diagram of the third type of sensor provided by the present invention. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of the invention.

[0014] In embodiments of the present invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," and "third" may explicitly or implicitly include one or more of that feature.

[0015] The directional terms mentioned in the embodiments of this invention, such as "up," "down," "inner," "outer," "left," and "right," are for reference only. Figure 2 The directional terms used are for the purpose of better and clearer explanation and understanding of the embodiments of the present invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention.

[0016] Figure 2 A cross-sectional schematic diagram of a sensor provided by the present invention; Figure 3 for Figure 2 Enlarged view of point X in the middle; Figure 4 for Figure 2 A three-dimensional structural diagram of the middle shell; Figure 5 for Figure 2 Exploded view of the transfer connector, temperature sensing unit and isolation sleeve.

[0017] As shown in the figure, the sensor in this embodiment includes a housing 1, an adapter 2, an isolation sleeve 3, a temperature sensing unit 4, a first sealing element 6, and a connector A. The housing 1 is machined from metal and includes a receiving cavity 101 with an opening at the top. The adapter 2 is located in the receiving cavity 101, and the bottom 1011 of the receiving cavity 101 supports the adapter 2. The connector A is located in the receiving cavity 101, and the connector A, the adapter 2, and the housing 1 are fixedly connected by riveting. The temperature sensing unit 4 includes pins 41 and a temperature sensing element 42. In this embodiment, the pins 41 include inserts 411 and leads 412. The inserts 411 are fixedly connected to the adapter 2 by injection molding, that is, the adapter 2 is made of plastic. The inserts 411 and the leads 412 are electrically connected by welding, and the leads 412 are electrically connected to the temperature sensing element 42. Pin 41 adopts a split structure. The insert 411 can be used as an insert to injection mold the adapter 2 first. During assembly, the insert 411 is then soldered to the lead wire 412. With this setting, the high temperature heat during injection molding of the adapter 2 will not affect the performance of the temperature sensing element 42.

[0018] The housing 1 includes a temperature sensing channel 102 and a pressure sensing channel 103, with the pressure sensing channel 103 serving as the inlet and outlet channels for the fluid being measured. In this embodiment, the temperature sensing channel 102 and the pressure sensing channel 103 are arranged parallel to each other. The isolation sleeve 3 is made of non-metallic materials, including ceramics and plastics. The portion of the aforementioned pin 41 extending downwards from the protrusion 22 is located within the inner cavity 30 of the isolation sleeve 3, and the aforementioned temperature sensing element 42 is located within the inner cavity 30 of the isolation sleeve 3. Specifically, the isolation sleeve 3 includes a sleeve body 31, which is cylindrical with a bottom. The sleeve body 31 includes an open end 311 and a closed end 312, with the temperature sensing element 42 being closer to the closed end 312 than the open end 311. The aforementioned adapter 2 includes a body portion 21 and a protrusion portion 22. The body portion 21 is generally cylindrical, and the protrusion portion 22 is generally cylindrical. The protrusion portion 22 protrudes downward from the body portion 21 toward the sensor in the longitudinal direction. The outer diameter of the protrusion portion 22 is smaller than the outer diameter of the body portion 21. The insert 411 of the pin 41 extends downward from the protrusion portion 22. The open end 311 has an opening, and the open end 311 covers the protrusion portion 22 through the opening.

[0019] In this embodiment, the first sealing element 6 is a rubber O-ring, and the first sealing element 6 is covered by an isolation sleeve 3 or a protrusion 22, so that the first sealing element 6 seals the inner cavity 30 of the isolation sleeve 3. This configuration isolates the pin 31 located inside the isolation sleeve 3 from the fluid being measured, thereby reducing the risk of short circuits in the pin 31. Furthermore, since the isolation sleeve 3 in this embodiment is made of a non-metallic material with insulating properties, while the housing 1 is made of metal, the isolation sleeve 3 can insulate the pin 41 from the housing 1, thus ensuring the electrical performance of the pin 41.

[0020] Furthermore, the isolation sleeve 3 also includes an extension 32, which extends outward from the sleeve body 31 along the transverse direction of the sensor. The extension 32 is annular, and the housing 1 can directly or indirectly support the extension 32. In this embodiment, as... Figure 2 , Figure 3 As shown, the first sealing member 6 is covered by the sleeve body 31 of the isolation sleeve 3, and the extension 32 is located above the first sealing member 6. In the longitudinal direction of the sensor, the body part 21 presses against the extension 32, the extension 32 presses against the first sealing member 6, and the first sealing member 6 presses against the housing 1. In this way, by pressing the first sealing member 6 in the longitudinal direction of the sensor, the inner cavity 30 of the isolation sleeve 3 is sealed, so that the measured fluid will not flow into the inner cavity 30, thereby reducing the risk of short circuit of the pin 41.

[0021] Figure 6 This is a partial cross-sectional schematic diagram of another sensor provided by the present invention.

[0022] As a variation, such as Figure 6 As shown, the first seal 6 has a protruding portion 22, and the extension portion 32 is located below the first seal 6. In the longitudinal direction of the sensor, the main body 21 presses against the first seal 6, the first seal 6 presses against the extension portion 32, and the extension portion 32 presses against the housing 1. In this way, by pressing the first seal 6 in the longitudinal direction of the sensor, the inner cavity 30 of the isolation sleeve 3 can also be sealed, so that the measured fluid will not flow into the inner cavity 30, thereby reducing the risk of short circuit of the pin 41.

[0023] Furthermore, such as Figure 3 , Figure 4 As shown, the housing 1 includes a stepped hole portion 11, which has the aforementioned temperature sensing channel 102. The stepped hole portion 11 has a stepped surface 110 facing the body portion 21. The stepped surface 110 supports the first sealing member 6 and the extension portion 32, that is, the stepped surface 110 supports the isolation sleeve 3. In the longitudinal direction of the sensor, the isolation sleeve 3 is limited by the body portion 21 of the adapter 2 and the stepped hole portion 11. As a specific embodiment, the stepped hole portion 11 includes a large-diameter section 111 and a small-diameter section 112. The inner diameter of the large-diameter section 111 is larger than the inner diameter of the small-diameter section 112. The stepped surface 110 connects the inner peripheral wall of the large-diameter section 111 and the inner peripheral wall of the small-diameter section 112. The aforementioned extension portion 32 and the first sealing member 6 are located within the large-diameter section 111, and the sleeve 31 is at least partially located within the small-diameter section 112. By providing a large-diameter section 111 to accommodate the extension 32 and the first seal 6, and by having the body 21 and the stepped surface 110 press the first seal 6 longitudinally against the sensor, the sealing reliability of the first seal 6 is improved.

[0024] To facilitate the assembly of the isolation sleeve 3, in this embodiment, the inner diameter of the small-diameter section 112 is larger than the outer diameter of the sleeve body 31, meaning that a gap channel 1021 is included between the outer peripheral wall of the sleeve body 31 and the inner peripheral wall of the small-diameter section 112. During measurement, the lower section of the sensor housing 1 is immersed in the fluid being measured, thus the fluid enters the gap channel 1021. The first sealing member 6, through deformation, can prevent the fluid from entering the inner cavity 30 of the isolation sleeve 3, meaning the first sealing member 6 can isolate the inner cavity 30 from the gap channel 1021.

[0025] Figure 7 This is a partial cross-sectional schematic diagram of the third type of sensor provided by the present invention.

[0026] In this embodiment, the housing 1A includes a receiving cavity 101, and the adapter 2A includes a body portion 21A and a protrusion 22A. The body portion 21A is located in the receiving cavity 101 and is positioned at the bottom 1011 of the receiving cavity 101. The body portion 21A includes a groove 214A with its opening facing downwards. The protrusion 22A protrudes downwards from the bottom of the groove 214A. The first sealing member 6 and the extension portion 32 are located in the groove 214A, and the bottom 1011 of the receiving cavity 101 supports the first sealing member 6 and the extension portion 32. In this embodiment, by creating a groove 214A on the adapter 2A to receive the first sealing member 6 and the extension portion 32, and then longitudinally pressing the first sealing member 6 by the bottom of the groove 214A against the bottom 1011 of the receiving cavity 101, the purpose and effect of the present invention can be achieved. Figure 7 The diagram shows a design where the first seal 6 is covered by a protruding portion 22A, with the first seal 6 positioned above the extension 32. Alternatively, the first seal 6 can be covered by an isolation sleeve 3, with the extension 32 positioned above the first seal 6.

[0027] In this embodiment, as Figure 2 As shown, the closed end 312 of the isolation sleeve 3 is located outside the housing 1, and the temperature sensing element 42 is also located outside the housing 1. This arrangement allows the closed end 312 to be surrounded by more of the measured fluid, improving the efficiency of temperature conduction and thus increasing the response time of the temperature sensing element 42. However, since the isolation sleeve 3 is made of non-metallic material, the closed end 312 is easily damaged by impacts, etc. Therefore, the sensor in this embodiment also includes a protective sleeve 7, which is made of metal and is fixedly connected to the housing 1 or is an integral structure, such as... Figure 2 The sensor is shown as a single unit. Laterally, the protective sleeve 7 and the isolation sleeve 3 are fitted with a clearance, allowing fluid to flow through this gap to the aforementioned gap channel 1021 when the sensor is operating. Longitudinally, the protective sleeve 7 protrudes downwards from the housing 1, covering the closed end 312 of the isolation sleeve 3. This design reduces the risk of impact damage to the closed end 312, thereby improving the reliability of the sensor product.

[0028] It should be noted that when the protective sleeve 7 and the shell 1 are separate structures, they can be fixed by means of extrusion, welding, riveting, etc.

[0029] Furthermore, the aforementioned protective sleeve 7 is cylindrical, with an opening at its lower end. In the longitudinal direction of the sensor, the lower end of the protective sleeve 7 is lower than the lower end of the closed end 312, meaning the closed end 312 is not exposed outside the protective sleeve 7. The opening at the lower end of the protective sleeve 7 allows the lower end of the closed end 312 to directly contact the fluid, thereby improving the response time of the temperature sensing element 42. On the other hand, the lower end of the protective sleeve 7 being lower than the lower end of the closed end 312 ensures that the closed end 312, located outside the housing 1, is protected as much as possible, reducing the probability of collision damage to the isolation sleeve 3.

[0030] Further as Figure 2 As shown, the housing 1 includes a first annular groove 104 surrounding the pressure sensing channel 103. The sensor in this embodiment also includes a second seal 8 located within the first annular groove 104. The body 21 of the adapter 2 presses against the second seal 8, and the second seal 8 presses against the bottom of the first annular groove 104. This arrangement prevents fluid entering the pressure sensing channel 103 from leaking through the gap between the adapter 2 and the housing 1, thus avoiding affecting the reliability of the sensor.

[0031] like Figure 2 As shown, the sensor also includes a pressure sensing unit 5, which is used to sense the pressure value of the fluid being measured. The adapter 2 also includes a receiving groove 210 with its opening facing upwards. The pressure sensing unit 5 is at least partially located in the receiving groove 210. The adapter 2 has a drainage cavity 211 and a drainage channel 212. The drainage cavity 211 is located below the pressure sensing unit 5, and the drainage channel 212 connects the drainage cavity 211 with the aforementioned pressure sensing channel 103. Since the pressure sensing unit 5 in this embodiment uses a ceramic pressure element, and the cross-sectional area of ​​the drainage cavity 211 is larger than the cross-sectional area of ​​the drainage channel 212, the contact area between the fluid being measured and the ceramic diaphragm on the lower surface of the pressure sensing unit 5 can be ensured, thereby improving the sensing efficiency of the pressure sensing unit 5.

[0032] like Figure 2 , Figure 3As shown, the adapter 2 also includes a second annular groove 213, which surrounds the drainage cavity 211. The sensor also includes a third seal 9, which is located in the second annular groove 213. In the longitudinal direction of the sensor, the pressure sensing unit 5 presses against the third seal 9, and the third seal 9 presses against the bottom of the second annular groove 213. The beneficial effect is that the fluid entering the drainage cavity 211 will not leak above the pressure sensing unit 5, thus avoiding affecting the reliability of the electronic components above the pressure sensing unit 5.

[0033] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0034] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and controls without departing from the concept of the present invention, and these modifications and controls all fall within the scope of protection of the present invention.

Claims

1. A sensor, characterized in that, include: The device comprises a housing, an adapter, an isolation sleeve, a temperature sensing unit, and a first seal. The housing includes a temperature sensing channel, and the isolation sleeve is at least partially located within the temperature sensing channel. The temperature sensing unit includes pins and a temperature sensing element, the pins being electrically connected to the temperature sensing element, the temperature sensing element being located within the cavity of the isolation sleeve. The isolation sleeve includes an open end and a closed end, the temperature sensing element being closer to the closed end than the open end. The adapter includes a protrusion, the pins extending from the protrusion, the pins extending from the protrusion being located within the cavity of the isolation sleeve, the open end being fitted over the protrusion, and the first seal fitting over the protrusion, or the first seal fitting over the isolation sleeve, the first seal sealing the cavity of the isolation sleeve.

2. The sensor according to claim 1, characterized in that, The adapter is made of non-metallic material. The adapter includes a main body. The protrusion protrudes downward from the main body toward the sensor longitudinally. The isolation sleeve is made of non-metallic material. The isolation sleeve includes a sleeve body and an extension. The sleeve body includes an open end and a closed end. The extension extends outward from the sleeve body along the sensor transversely. The housing directly or indirectly supports the extension.

3. The sensor according to claim 2, characterized in that, The first seal covers the protrusion, the extension is located below the first seal, in the longitudinal direction of the sensor, the body abuts against the first seal, the first seal abuts against the extension, and the extension presses against the housing.

4. The sensor according to claim 2, characterized in that, The first seal is fitted with the isolation sleeve, the extension is located above the first seal, the body portion presses against the extension portion in the longitudinal direction of the sensor, the extension portion presses against the first seal, and the first seal is pressed against the housing.

5. The sensor according to any one of claims 2-4, characterized in that, The housing includes a stepped hole with an upward-facing stepped surface, the stepped hole having the temperature sensing channel, the stepped surface of the stepped hole supporting the first seal and the extension, the stepped hole including a large hole section and a small hole section, the stepped surface of the stepped hole connecting the inner peripheral wall of the large hole section and the inner peripheral wall of the small hole section, the extension and the first seal being located within the large hole section, and the sleeve being at least partially located within the small hole section.

6. The sensor according to claim 5, characterized in that, The outer peripheral wall of the sleeve and the inner peripheral wall of the small hole segment include a gap channel, and the first seal isolates the inner cavity of the isolation sleeve from the gap channel.

7. The sensor according to any one of claims 2-4, characterized in that, The housing includes a receiving cavity, the body portion is located in the receiving cavity, the body portion includes a groove with the groove opening facing downward, the protrusion protrudes downward from the bottom of the groove, the first seal and the extension portion are located in the groove, and the bottom of the receiving cavity supports the first seal and the extension portion.

8. The sensor according to any one of claims 1-4, characterized in that, The closed end is located outside the housing, the temperature sensing element is located outside the housing, and the sensor also includes a protective sleeve. The protective sleeve is fixedly connected to the housing or is an integral structure. In the longitudinal direction of the sensor, the protective sleeve protrudes downward from the housing and covers the closed end.

9. The sensor according to claim 8, characterized in that, The protective sleeve is cylindrical, with an opening at its lower end. In the longitudinal direction of the sensor, the lower end of the protective sleeve is lower than the lower end of the closed end.

10. The sensor according to any one of claims 1-4, characterized in that, The housing also includes a pressure sensing channel, which is arranged parallel to the temperature sensing channel. The adapter or the housing includes a first annular groove, which surrounds the pressure sensing channel. The sensor also includes a second seal, which is located in the first annular groove. The adapter presses against the second seal, and the second seal presses against the bottom of the first annular groove.

11. The sensor according to claim 10, characterized in that, It also includes a pressure sensing unit. The adapter includes a receiving groove with the opening of the receiving groove facing upward. The pressure sensing unit is at least partially located in the receiving groove. The adapter has a drainage cavity and a drainage channel. The drainage cavity is located below the pressure sensing unit. The drainage channel connects the drainage cavity and the pressure sensing channel. The cross-sectional area of ​​the drainage cavity is larger than the cross-sectional area of ​​the drainage channel.

12. The sensor according to claim 11, characterized in that, The adapter also includes a second annular groove surrounding the drainage cavity. The sensor also includes a third seal located in the second annular groove. In the longitudinal direction of the sensor, the pressure sensing unit presses against the third seal, and the third seal presses against the bottom of the second annular groove.

Images