Sensor fixing structure

Abstract

Disclosed in the present invention is a sensor fixing structure. The sensor fixing structure is used for fixing a sensor at the interface of a cavity and enabling a measurement end of the sensor to be located in the cavity so as to measure fluid parameters in the cavity, and comprises: a fastening member, detachably mounted at the interface; a fixing member, provided with a first through hole extending in the length direction; and a sealing portion, used for sealing the measurement end and sealing a gap between the sensor and the first through hole, wherein when the sensor fixing structure is assembled, the fixing member and the fastening member are sequentially assembled at the interface, the sensor runs through and is fixed in the first through hole, the measurement end is located in the cavity, and the fixing member is pressed under the preload of the fastening member to form a seal between the interface and the fastening member. In the present application, the sensor fixing structure has relatively high sealing performance by means of the described structure.

Description

Sensor fixing structure Technical Field

[0001] This application relates to the field of pipeline sensor technology, and further to a sensor fixing structure. Background Technology

[0002] In the existing technology, pipelines are often used to transport fluid substances such as liquids or gases. In order to ensure the normal operation of the equipment, different types of sensors can be used to detect parameters such as temperature, pressure, concentration or flow rate of the fluid in the pipeline.

[0003] Chinese patent application number 201210479628.5 discloses a method and device for measuring the temperature of a fluid medium inside a small tube. By mounting a temperature sensing element (sensor) on an adapter and connecting the adapter in series between two small tubes, the temperature sensing head of the temperature sensing element is located at the center of the fluid, thereby improving the accuracy of temperature measurement.

[0004] However, the aforementioned patent application documents do not disclose the fixing method of the temperature measuring element (sensor) and the adapter. The fixing method of the temperature measuring element (sensor) and the adapter directly affects the sealing performance of the overall structure of the pipeline temperature measuring device. Especially during the pipeline transportation of high temperature and high pressure fluids, the pressure inside the pipeline increases, the risk of sealing failure of the pipeline temperature measuring device increases, and the risk of fluid leakage is greater.

[0005] In summary, this application aims to provide a sensor mounting structure with high sealing performance.

[0006] Summary of the Invention

[0007] To address the aforementioned technical problems, the purpose of this application is to provide a sensor fixing structure with high sealing performance.

[0008] To achieve the above objectives, this application provides a sensor fixing structure for fixing a sensor to the interface of a cavity, with the sensor's detection end located within the cavity to detect fluid parameters within the cavity. The structure includes: a fastener detachably mounted at the interface; a fixing member having a first through hole extending along its length; and a sealing portion for sealing the detection end and the gap between the sensor and the first through hole. During assembly of the sensor fixing structure, the fixing member and the fastener are sequentially assembled at the interface, the sensor is fixed through the first through hole, and the detection end is located within the cavity. The fixing member, under the preload of the fastener, is pressed to form a seal between the interface and the fastener.

[0009] Compared with the prior art, the present invention has the following beneficial effects: On the one hand, the above solution forms a seal between the fastener and the interface and the fastener under the pre-tightening force of the fastener, thereby increasing the sealing effect between the fastener and the interface and the fastener; on the other hand, the above solution seals the gap between the sensor and the first through hole by sealing the sealing part, thereby increasing the sealing effect between the fastener and the sensor. Thus, the sensor fixing structure as a whole has a high sealing performance.

[0010] Overview of the attached figures

[0011] The features and performance of this application are further described by the following embodiments and accompanying drawings.

[0012] The preferred embodiments will now be described in a clear and easy-to-understand manner, in conjunction with the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages, and implementation methods of the present invention.

[0013] Figure 1 is a three-dimensional structural diagram of a sensor fixing structure according to an embodiment of this application;

[0014] Figure 2 is a cross-sectional view of Figure 1 along section f;

[0015] Figure 3 is a magnified view of a portion of region a in Figure 2;

[0016] Figure 4 is a magnified view of a portion of region b in Figure 2;

[0017] Figure 5 is a schematic diagram of the assembly structure of the fastener, sealing part and sensor according to one embodiment of this application;

[0018] Figure 6 is the front view of Figure 5;

[0019] Figure 7 is a full sectional view of Figure 6;

[0020] Figure 8 is a cross-sectional view of a sensor fixing structure according to another embodiment of this application;

[0021] Figure 9 is a magnified view of a portion of region c in Figure 8;

[0022] Figure 10 is a schematic diagram of the assembly structure of the fastener, sealing part and sensor according to another embodiment of this application;

[0023] Figure 11 is a full sectional view of Figure 10;

[0024] Figure 12 is a magnified view of a portion of region e in Figure 11;

[0025] Figure 13 is a schematic diagram of the structure after the sealing part and sensor in Figure 8 have been removed;

[0026] Figure 14 is a magnified view of a portion of region d in Figure 13.

[0027] Preferred embodiments of this application

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0029] To keep the drawings concise, each figure only schematically shows the parts relevant to the invention, and these do not represent the actual structure of the product. Furthermore, to facilitate understanding, in some figures, only one of components with the same structure or function is schematically depicted, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0030] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0031] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] This application discloses a sensor fixing structure 100 for fixing a sensor 200 at the interface 330 of a cavity 340 and placing the detection end 210 of the sensor 200 inside the cavity 340 to detect fluid parameters inside the cavity 340.

[0033] As shown in Figures 1 and 2, the sensor fixing structure 100 is used to fix the sensor 200 to the interface 330 of the multi-port pipe 300 as an example to illustrate the sensor fixing structure 100. The multi-port pipe 300 has a hollow structure (i.e., the multi-port pipe 300 has an internal cavity 340) and includes a first pipe interface 310, a second pipe interface 320, and an interface 330 that are interconnected. The first pipe interface 310 and the second pipe interface 320 are used to connect two adjacent pipes so that the cavity 340 is filled with fluid. The interface 330 is used to install the detection end 210 of the sensor 200 into the cavity 340 of the multi-port pipe 300 through the sensor fixing structure 100. The sensor 200 includes, but is not limited to, a temperature sensor, a hydraulic sensor, and a pressure sensor.

[0034] Specifically, the sensor fixing structure 100 includes a fastener 110, a fixing member 120, and a sealing part 130. As shown in Figures 2 and 3, the fastener 110 is detachably mounted at the interface 330. The fixing member 120 has a first through hole 123 extending along the length direction t of the sensor 200, the length of which is less than the length of the sensor 200. The sealing part 130 seals the detection end 210 of the sensor 200 and the gap S2 between the sensor 200 and the first through hole 123. During assembly of the sensor fixing structure, the fixing member 120 and the fastener 110 are sequentially assembled at the interface 330, with the detection end 210 located within the cavity 340. Under the pre-tightening force of the fastener 110, the fixing member 120 is pressed against the interface 330 and the fastener 110 to form a seal.

[0035] In this embodiment, on the one hand, the cooperation between the fastener 110, the fixing member 120, and the interface 330 increases the sealing performance between the fixing member 120 and the interface 330 and the fastener 110; on the other hand, the sealing part 130 seals the gap S2 between the sensor 200 and the first through hole 123, increasing the sealing performance between the sensor 200 and the fixing member 120. This embodiment, through these two aspects, ensures the overall sealing effect of the sensor fixing structure 100 during the fixing of the sensor 200.

[0036] Furthermore, in this embodiment, the sensor 200 is fixed through the first through hole 123 along its length t, thus fixing the sensor 200 relative to the fixing member 120. The fixing member 120 and the fastener 110 are sequentially assembled at the interface 330, further fixing the fixing member 120 relative to the interface 330, thereby fixing the sensor 200 relative to the interface 330. In practical applications, the depth of the sensor 200 extending into the cavity 340 can be accurately controlled by adjusting the position of the sensor 200 through the first through hole 123. Therefore, this sensor fixing structure 100 avoids the sensor 200 extending too far into the cavity 340, which would reduce the actual flow area of ​​the fluid within the cavity 340 and affect the flow rate of the fluid passing through the cavity 340. It also avoids the sensor 200 extending too shortly into the cavity 340, resulting in insufficient contact between the detection end 210 and the fluid, thus affecting the detection accuracy of the fluid within the cavity 340.

[0037] Preferably, as shown in FIG2, the sealing part 130 includes a sleeve 131 and a welding layer 132. The sleeve 131 has a sealing end 1312 located within the cavity 340, which is used to accommodate the detection end 210. The wall of the sleeve 131 is disposed in the gap S2, and the welding layer 132 is located between the port of the first through hole 123 and the sleeve 131. In this embodiment, the sealing problem of the gap S2 between the sensor 200 and the first through hole 123 is first transformed into the sealing problem between the sleeve 131 and the first through hole 123 by using the sleeve 131. Then, the sealing between the sleeve 131 and the first through hole 123 is completed by the welding layer 132, thereby realizing the sealing of the gap S2 between the sensor 200 and the first through hole 123 by the sealing part 130.

[0038] Specifically, the attachment locations of the weld layer 132 include both the connection point between the end of the first through hole 123 near the cavity 340 and the sleeve 131 shown in Figure 4, and the connection point between the end of the first through hole 123 away from the cavity 340 and the sleeve 131 shown in Figure 3, and the weld layer 132 is arranged in a ring around the outer surface of the sleeve 131.

[0039] Furthermore, in this embodiment, the fastener 110 is preferably a PFA (Perfluoroalkoxy) plastic part, the fastener 120 is preferably a PTEE (Polytetrafluoroethylene) plastic part, the sleeve 131 is preferably a PFA tube, and the weld layer 132 is preferably a PFA weld layer.

[0040] Preferably, as shown in Figures 5 and 6, the fastener 120 includes a force-receiving portion 121 and an insertion portion 122 along the aforementioned length direction t. The end of the force-receiving portion 121 away from the insertion portion 122 has a force-receiving surface 1211 that mates with the fastener 110. The insertion portion 122 has a sealing structure that mates with the interface 330. The force-receiving surface 1211 is used to bear the aforementioned pre-tightening force, compressing the sealing structure to form a seal between the fastener 120 and the interface 330.

[0041] Specifically, the sealing structure includes an outer conical surface 1222 formed on the side wall of the insertion portion 122 and an inner conical surface 351 formed on the inner wall of the interface (as shown in FIG3). In the assembled state, the outer conical surface 1222 and the inner conical surface 351 cooperate with each other to form a seal between the fastener 120 and the interface 330.

[0042] Furthermore, to further enhance the sealing effect between the fastener 120 and the interface 330, the sealing structure also includes an annular boss and an annular groove constructed on the opposing sides of the insertion portion 122 and the interface 330. The annular boss and the annular groove cooperate to form a seal between the fastener 120 and the interface 330. Specifically, as shown in FIG7, an annular groove 1223 and an annular boss 1224 are provided on the side of the insertion portion 122 away from the force-bearing portion 121, and the annular groove 1223 and the annular boss 1224 are arranged sequentially from the inside to the outside around the first through hole 123. As shown in FIG4, an annular boss 352 and an annular groove 353 are provided on the side of the interface 330 facing the insertion portion 122, and the annular boss 352 and the annular groove 1223 cooperate with each other, and the annular groove 353 and the annular boss 1224 cooperate with each other.

[0043] Preferably, referring again to Figures 6 and 7, the fastener 120 further includes an extension 124 located on the side of the force-receiving portion 121 away from the insertion portion 122. The force-receiving portion 121 is configured with a diameter larger than that of the extension 124 and the insertion portion 122, and the force-receiving surface 1211 corresponds to the annular surface of the force-receiving portion 121 facing the extension 124.

[0044] Specifically, referring again to Figures 2 and 3, the fastener 110 is adapted to the fastener 120. The fastener 110 includes a limiting section 112 and a connecting section 113 connected sequentially along the aforementioned length direction t, and a second through hole 111 penetrating the limiting section 112 and the connecting section 113. The second through hole 111 located in the limiting section 112 has a first inner diameter d1 that matches the outer diameter of the extension 124, and the second through hole 111 located in the connecting section 113 has a second inner diameter d2 that matches the outer diameter of the interface 330. The first inner diameter d1 is smaller than the second inner diameter d2. In the assembled state, the insertion part 122 is installed in the interface 330, the force-bearing part 121 is located between the connecting section 113 and the interface 330, the extension 124 is located in the second through hole 111 of the limiting section 112, and the outer wall of the interface 330 is detachably connected to the inner wall of the second through hole 111 of the connecting section 113. The connection methods of the aforementioned interface 330 and connection segment 113 include, but are not limited to, threaded connection and interference fit connection.

[0045] Figures 8 and 9 show another embodiment of the sensor fixing structure 100 of this application. In this embodiment, the sealing part 130 includes only the sleeve 131. One end of the sleeve 131 is sealed within the cavity 340 to accommodate the detection end 210. The other end of the sleeve 131 extends along the aforementioned length direction t toward the fixing member 120 and wraps around the outer surface of the fixing member 120.

[0046] Specifically, as shown in Figures 10, 11, and 12, the sensor 200 is fixed through the first through hole 123 along its length direction t. Specifically, along the aforementioned length direction t, a portion of the sensor 200 (including the detection end 210) is located on the side of the fixing member 120 closer to the cavity 340, and another portion of the sensor 200 is located on the side of the fixing member 120 away from the cavity 340. Since the sleeve 131 simultaneously wraps the fixing member 120 and the sensor 200 located on the side of the fixing member 120 closer to the cavity 340, it isolates the gap S2 between the sensor 200 and the first through hole 123 from the cavity 340, indirectly achieving the effect of sealing the gap S2 between the sensor 200 and the first through hole 123.

[0047] Preferably, the fastener 120 has a spherical structure, as shown in Figures 9, 13, and 14. The fastener 110 and the interface 330 have hemispherical cavities S1 and S3 on their opposing sides, which mate with the fastener 120. These cavities are used to compress the sleeve 131 wrapped around the outer surface of the fastener 120 under the aforementioned pre-tightening force, thereby forming a seal between the fastener 120 and the fastener 110 and the interface 330, respectively. Referring again to Figure 9, in the assembled state, the fastener 110 presses against the fastener 120. The fastener 120 and the sleeve 131 wrapped around its surface are located within the hemispherical cavities S1 and S3, forming a seal between the sleeve 131 on the surface of the fastener 120 and the interface 330 and the fastener 110.

[0048] Furthermore, in this embodiment, the fastener 110 is preferably a PFA (Perfluoroalkoxy) plastic part, the fastener 120 is preferably an SUS (steel use stainless) part, and the sleeve 131 is preferably a PFA tube.

[0049] It should be noted that in the embodiments shown in Figures 1 and 2, a cap 1311 is provided at the end of the sleeve 131 away from the cavity 340, which is used to fix the sensor 200 relatively inside the sleeve 131. However, in this embodiment, the gap between the sensor 200 and the first through hole 123 is filled with resin 133 (as shown in Figure 12) to fix the sensor 200 relatively inside the sleeve 131.

[0050] Preferably, as shown in FIG14, the fastener 110 includes a limiting segment 112 and a connecting segment 113 connected sequentially along the aforementioned length direction t, and a second through hole 111 penetrating the limiting segment 112 and the connecting segment 113. The second through hole 111 located in the limiting segment 112 has a first inner diameter d3, and the second through hole 111 located in the connecting segment 113 has a second inner diameter d4 that matches the outer diameter of the interface 330. The first inner diameter d3 is smaller than the second inner diameter d4. Hemispherical cavities S1 and S3 are located on the opposite side of the limiting segment 112 where the second through hole 111 is located and the interface 330. It should be noted that the first inner diameter d3 in Figure 14 and the first inner diameter d1 shown in Figure 3 are both used to represent the diameter of the second through hole 111 within the limiting section 112, and the first inner diameters d1 and d3 are both not less than the outer diameter of the sensor 200 to allow the sensor 200 to pass through; the second inner diameter d4 in Figure 14 and the second inner diameter d2 shown in Figure 3 are both used to represent the diameter of the second through hole 111 within the connecting section 113.

[0051] Referring again to Figure 9, in the assembled state, the fastener 120 and the sleeve 131 covering its surface are clamped within the hemispherical cavities S1 and S3 of the interface 330 and the limiting section 112, and the outer wall of the interface 330 is detachably connected to the inner wall of the second through hole 111 of the connecting section 113. The connection methods of the interface 330 and the connecting section 113 include, but are not limited to, threaded connection and interference fit connection.

[0052] It should be noted that the above embodiments can be freely combined as needed. The above are merely preferred embodiments of the present invention. For those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A sensor fixing structure for fixing a sensor at an interface of a cavity and positioning a detection end of the sensor inside the cavity to detect a fluid parameter in the cavity, characterized by, include: Fasteners are detachably installed at the interface; A fixing member, wherein the fixing member is provided with a first through hole extending along the length direction of the sensor; A sealing portion is used to seal the detection end and to seal the gap between the sensor and the first through hole; wherein, When assembling the sensor fixing structure, the fixing member and the fastener are sequentially assembled at the interface, the sensor is fixed through the first through hole, and the detection end is located in the cavity. The fixing member is pressed under the pre-tightening force of the fastener to form a seal between the interface and the fastener.

2. The sensor fixing structure according to claim 1, characterized in that, The sealing part includes a sleeve and a welding layer. The sleeve has a sealing end located inside the cavity. The sealing end is used to accommodate the detection end. The wall of the sleeve is disposed in the gap. The weld layer is located between the first through hole and the sleeve, and is used to seal the gap between the first through hole and the sleeve.

3. The sensor fixing structure according to claim 2, characterized in that, The weld layer is attached to the connection between the end of the first through hole near the cavity and the sleeve, and / or the weld layer is attached to the connection between the end of the first through hole away from the cavity and the sleeve.

4. The sensor fixing structure according to claim 1, characterized in that, The fastener includes a force-receiving portion and an insertion portion along its length. The end of the force-receiving portion away from the insertion portion has a force-receiving surface that mates with the fastener. The insertion portion and the interface have a mutually cooperating sealing structure. The force-receiving surface is used to bear the pre-tightening force, thereby ensuring the sealing structure... Pressure is applied to form a seal between the fastener and the interface.

5. The sensor fixing structure according to claim 4, characterized in that, The sealing structure includes an outer conical surface formed on the side wall of the insertion portion and an inner conical surface formed on the inner wall of the interface, wherein the outer conical surface and the inner conical surface cooperate with each other to form a seal between the fastener and the interface.

6. The sensor fixing structure according to claim 4, characterized in that, The sealing structure includes an annular boss and an annular groove formed on the opposite sides of the insertion part and the interface, wherein the annular boss and the annular groove cooperate with each other to form a seal between the fixing member and the interface.

7. The sensor fixing structure according to claim 4, characterized in that, The fastener includes a limiting segment and a connecting segment connected sequentially along the length direction, and a second through hole penetrating the limiting segment and the connecting segment. The second through hole has a first inner diameter in the limiting segment that allows the sensor to pass through, and the second through hole has a second inner diameter in the connecting segment that matches the outer diameter of the interface. The first inner diameter is smaller than the second inner diameter.

8. The sensor fixing structure according to claim 7, characterized in that, The fastener further includes an extension located on the side of the force-receiving portion away from the insertion portion. The force-receiving portion is configured with a diameter larger than the diameters of the extension and the insertion portion. The force-receiving surface is configured as an annular surface of the force-receiving portion facing the extension. The first inner diameter of the second through hole matches the outer diameter of the extension.

9. The sensor fixing structure according to claim 1, characterized in that, The sealing part includes a sleeve having a sealing end located within the cavity for accommodating the detection end, and the other end of the sleeve being wrapped around the outer surface of the fixing member.

10. The sensor fixing structure according to claim 9, characterized in that, The fastener has a spherical structure, and the fastener and the interface have hemispherical cavities on their opposite sides. The hemispherical cavities are adapted to the spherical structure and are used to squeeze the sleeve wrapped around the outer surface of the fastener under the action of the pre-tightening force, so that the fastener forms a seal with the fastener and the interface respectively.

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