Remote-transmission pressure transmitter capillary tube sealing connection structure

Abstract

The utility model relates to a pressure transmitter capillary tube sealing connection structure capable of remote transmission. Comprising a shell chassis arranged at the bottom end of the shell; the base is arranged in the shell, and an accommodating hole is formed in the base; the back pressure plate is arranged in the shell, and a threaded hole is formed in the back pressure plate; the first outer pipe and the second outer pipe are both contained in the containing hole, a cavity is formed between the first outer pipe and the second outer pipe and the containing hole, and a sealing piece is arranged in the cavity; a protective sleeve is arranged at one end of the first outer pipe, the other end of the first outer pipe is connected with one end of the second outer pipe, the protective sleeve is provided with an external thread structure in threaded fit with the threaded hole, and the other end of the second outer pipe abuts against the base plate. The capillary tube is arranged in the first outer tube and the second outer tube in a sleeving manner; and the sealing joint is connected with the chassis, and the capillary tube penetrates through the sealing joint. According to the utility model, the sealing performance is obviously improved, more convenient installation and maintenance are realized, and the requirement of long-distance pressure signal transmission in a high static pressure environment can be met.

Description

Technical Field

[0001] This utility model relates to the field of transmitter technology, and in particular to a capillary sealing connection structure for a pressure transmitter capable of remote transmission. Background Technology

[0002] Pressure transmitters suitable for high static pressure applications need to achieve long-term stable operation in complex environments such as extreme high pressure, corrosive liquids, and temperature fluctuations (e.g., deep-sea environments). The sealed connection between the pressure transmitter and the capillary tube is crucial for ensuring accurate and reliable pressure signal transmission.

[0003] Existing sealing structures mostly employ multi-layer O-rings or welding processes, but they have the following shortcomings: Firstly, welded connections are not detachable, making subsequent maintenance extremely inconvenient, and under high pressure, they are prone to micro-cracks due to thermal stress, affecting sealing reliability; secondly, the capillary tube and transmitter interface are subjected to long-term pressure and temperature fluctuations, which can easily lead to fatigue fracture, resulting in signal transmission distortion or even leakage.

[0004] Therefore, existing technologies cannot simultaneously meet practical requirements in terms of high sealing performance, impact resistance, and ease of maintenance. There is an urgent need to propose a connection structure that combines high sealing performance, excellent impact resistance, and easy maintenance to meet the application requirements in high hydrostatic pressure environments. Summary of the Invention

[0005] Therefore, this utility model provides a capillary sealing connection structure for a pressure transmitter that can transmit signals over long distances. This structure significantly improves the sealing performance and enables more convenient installation and maintenance, making it suitable for long-distance pressure signal transmission needs in high static pressure environments.

[0006] To solve the above-mentioned technical problems, this utility model provides a capillary sealing connection structure for a remote pressure transmitter, comprising:

[0007] shell;

[0008] The chassis is located at the bottom of the outer casing;

[0009] A base is disposed within the outer casing, and the base is provided with a receiving hole;

[0010] A back pressure plate is disposed inside the housing, and the back pressure plate is provided with threaded holes;

[0011] The first outer tube and the second outer tube are both housed in the receiving hole and form a cavity between the outer wall and the receiving hole. A sealing element is provided in the cavity. A protective sleeve is provided at one end of the first outer tube and the other end is connected to one end of the second outer tube. The protective sleeve is provided with an external thread structure that is threaded to the threaded hole. The other end of the second outer tube abuts against the chassis.

[0012] A capillary tube is fitted inside the first outer tube and the second outer tube;

[0013] A sealing joint is connected to the chassis, and the capillary tube passes through the sealing joint.

[0014] In one embodiment of this utility model, the chassis is provided with a plurality of threaded through holes, and the sealing joint is threadedly connected to the threaded through holes; each of the threaded through holes is coaxially arranged with the corresponding receiving hole.

[0015] In one embodiment of this utility model, the chassis is disc-shaped and includes a first half-disc and a second half-disc. The first half-disc and the second half-disc are detachably connected by bolts. The chassis is also provided with a threaded connection hole connected to the base.

[0016] In one embodiment of this utility model, a sealing ring is provided between the sealing joint and the chassis.

[0017] In one embodiment of this utility model, the base includes a first base body and a second base body. The first base body and the second base body are connected by bolts after the concave-convex structure is engaged, so as to achieve a detachable connection.

[0018] In one embodiment of this utility model, the first outer tube has a groove structure at its end, and the second outer tube has a connecting post at one end facing the groove structure, forming a step between the two ends. The connecting post extends into the groove structure and abuts against the bottom wall of the groove structure, and the step abuts against the end of the first outer tube.

[0019] In one embodiment of this utility model, the outer diameter of the first outer tube is larger than the outer diameter of the second outer tube.

[0020] In one embodiment of this utility model, the protective sleeve and the first outer tube are connected by argon arc welding.

[0021] In one embodiment of this utility model, the first outer tube and the second outer tube are connected by argon arc welding.

[0022] In one embodiment of this utility model, the sealing element includes a diamond-shaped sealing material.

[0023] The above-mentioned technical solution of this utility model has the following advantages compared with the prior art:

[0024] The capillary sealing connection structure for a pressure transmitter capable of long-distance transmission described in this utility model significantly improves sealing performance while enabling more convenient installation and maintenance, and is suitable for long-distance pressure signal transmission needs in high static pressure environments.

[0025] This utility model features a protective sleeve that is fixedly connected to the end of the outer tube and has external threads for engaging with the threaded holes of the back pressure plate. The protective sleeve can preferentially bear external loads, effectively buffering the load, reducing the risk of fatigue damage at critical connections, and improving the system's impact resistance and safety factor.

[0026] This utility model adopts a threaded connection and a split design (including a detachable base, chassis, and outer shell), effectively eliminating the traditional integrated welding method. The functional modules are connected by bolts or threads, allowing for flexible adjustments during assembly, effectively addressing defective products caused by processing deviations, and greatly reducing maintenance and operating costs.

[0027] This invention achieves excellent airtightness and liquid tightness through the structural design of the shell, chassis, base, outer tube, and sealing components. The sealing components adopt highly elastic, high-pressure resistant, and corrosion-resistant diamond-shaped sealing materials, which can adapt to complex working conditions such as high temperature, high pressure, and highly corrosive media, significantly improving the long-term sealing stability of the pressure transmitter in extreme environments and preventing media leakage. Attached Figure Description

[0028] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0029] Figure 1 This is a schematic diagram of the capillary sealing connection structure of the remote-transmitting pressure transmitter of this utility model.

[0030] Figure 2 yes Figure 1 A magnified view of a portion of the image.

[0031] Figure 3 This is a structural schematic diagram of the chassis of this utility model.

[0032] Explanation of reference numerals in the instruction manual:

[0033] 1. Outer shell;

[0034] 2. Chassis; 201. Threaded through hole; 202. Threaded connection hole; 2a. First half-disc; 2b. Second half-disc;

[0035] 3. Base; 3a. First base body; 3b. Second base body;

[0036] 4. Back pressure plate;

[0037] 5. First outer tube; 51. Boss; 52. Groove structure;

[0038] 6. Second outer tube; 61. Connecting column;

[0039] 7. Seals;

[0040] 8. Protective sleeve; 81. External thread structure;

[0041] 9. Capillary tube;

[0042] 10. Sealing joint; 101. Sealing ring. Detailed Implementation

[0043] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0044] In this utility model, when directions (up, down, left, right, front, and back) are described, it is only for the convenience of describing the technical solution of this utility model, and does not indicate or imply that the technical features referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0045] In this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc. are understood to exclude the stated number; "above," "below," "within," etc. are understood to include the stated number. In the description of this utility model, if "first" or "second" is used, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of the indicated technical features.

[0046] In this utility model, unless otherwise explicitly defined, terms such as "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; a fixed connection, a detachable connection, or an integrally formed connection; a mechanical connection, an electrical connection, or a connection capable of mutual communication; or the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model based on the specific content of the technical solution.

[0047] Reference Figure 1 , Figure 2 As shown, the capillary sealing connection structure for a remote pressure transmitter according to this utility model includes:

[0048] Housing 1, which serves as the outermost protective housing for the pressure transmitter and its connecting components, is used to cover and support all internal components, preventing the influence of the external environment (such as moisture, dust, and corrosive media) on the internal components;

[0049] The chassis 2 is located at the bottom of the outer shell 1 and supports the outer shell 1;

[0050] The base 3 is disposed inside the outer shell 1, and the base 3 is provided with a receiving hole;

[0051] Back pressure plate 4 is disposed inside the outer shell 1, serving to limit movement and withstand internal pressure. The back pressure plate 4 is provided with threaded holes.

[0052] The first outer tube 5 and the second outer tube 6 are both housed in the receiving hole and form a cavity between them. A sealing element 7 is provided in the cavity. A protective sleeve 8 is provided at one end of the first outer tube 5 and the other end is connected to one end of the second outer tube 6. The protective sleeve 8 is provided with an external thread structure 81 that is threaded to the threaded hole. The other end of the second outer tube 6 abuts against the chassis 2.

[0053] Capillary tube 9 is sleeved inside the first outer tube 5 and the second outer tube 6;

[0054] The sealing joint 10 is connected to the chassis 2, and the capillary tube 9 passes through the sealing joint 10 and leads out of the outer casing 1.

[0055] Through the above structural design, the connection between the transmitter and capillary tube 9 is optimized from the traditional welding method to a detachable structure, enabling timely adjustments for defective products caused by processing deviations during assembly. In the event of product defects, relevant components can be quickly disassembled and replaced, significantly improving the flexibility and efficiency of the assembly process. Simultaneously, it helps reduce maintenance costs and enhances the overall maintainability and reliability of the product.

[0056] As can be understood, capillary tube 9 serves as the pressure transmission channel between the pressure transmitter and the measured medium. Its function is to reliably transmit the pressure signal from the measured point over a long distance to the sensitive element of the transmitter, thereby achieving remote pressure measurement and monitoring. One end of capillary tube 9 is connected to the measured pressure point, and the other end is connected to the pressure transmitter cavity. The pressure change generated by the measured medium (such as liquid or gas) in the pipeline is transmitted through the filling liquid (silicone oil or inert liquid) inside capillary tube 9, or directly through gas, forming a pressure transmission path inside capillary tube 9, accurately transmitting the pressure to the sensitive element of the transmitter (such as the pressure sensing diaphragm).

[0057] Reference Figure 3 As shown, the chassis 2 has multiple threaded through holes 201, and the sealing joint 10 is threadedly connected to the threaded through holes 201. Each threaded through hole 201 is coaxially arranged with the corresponding receiving hole.

[0058] In one embodiment, the chassis 2 is disc-shaped, comprising a first half-disc 2a and a second half-disc 2b, which are detachably connected by bolts. The chassis 2 also has a threaded connection hole 202 for connection with the base 3, facilitating installation, disassembly, and maintenance between the base 3 and the chassis 2.

[0059] The first half-disc 2a and the second half-disc 2b are two equally divided semicircular discs. During installation, bolt holes are pre-designed along the mating edges of the two half-discs. During installation, bolts are inserted and nuts are tightened to securely connect the two half-discs into one unit. The bolt holes are evenly distributed along the joint to ensure uniform stress distribution and a robust structure at the joint. (Refer to...) Figure 3 As shown, a threaded through hole 201 is formed between the first half-disc 2a and the second half-disc 2b. Threaded connection holes 202 are circumferentially distributed around the threaded through hole 201.

[0060] In one embodiment, a sealing ring 101 is provided between the sealing joint 10 and the chassis 2 to further improve the sealing performance at the interface.

[0061] In one embodiment, the base 3 includes a first base body 3a and a second base body 3b. The first base body 3a and the second base body 3b are connected by bolts after a concave-convex structure is fitted together, so as to achieve a detachable connection, which facilitates the installation, disassembly and maintenance of the base 3 and the outer tube. The base 3 is also connected to the outer shell 1 by bolts.

[0062] In one embodiment, the protective sleeve 8 is connected to the first outer tube 5 by argon arc welding. For ease of connection, a boss 51 is provided at the end of the first outer tube 5, and the protective sleeve 8 is fitted onto the boss 51. By providing the protective sleeve 8 with an external thread structure 81, the capillary tube 9 is easily installed and removed, and the protective sleeve 8 can preferentially bear the load, thus acting as a load buffer.

[0063] In one embodiment, the protective sleeve 8 is made of stainless steel. Alternatively, high-strength alloy steel, Hastelloy, or other special corrosion-resistant alloy materials may be selected depending on the actual working conditions, and surface strengthening treatment can be applied to ensure that the protective sleeve 8 maintains excellent sealing performance and structural safety over a long period under harsh environments such as high static pressure, strong corrosion, and frequent temperature changes.

[0064] In one embodiment, the first outer tube 5 and the second outer tube 6 are connected by argon arc welding. To facilitate welding, the first outer tube 5 has a larger outer diameter and is provided with a groove structure 52. The second outer tube 6 has a smaller outer diameter, and a connecting post 61 is provided at one end facing the groove structure 52, forming a step between the two ends. The connecting post 61 extends into the groove structure 52 and abuts against the bottom wall of the groove structure 52, and the step abuts against the end of the first outer tube 5.

[0065] It should be noted that by using two outer tubes, the capillary tube 9 can be assembled and welded to the first outer tube 5 first, then the capillary tube 9 can be assembled and welded to the second outer tube 6, and finally the two outer tubes can be connected to each other. This step-by-step assembly helps ensure the coaxiality, sealing, and structural precision of each interface, improving overall assembly efficiency and reliability. In practical applications, the first outer tube 5 and the second outer tube 6 can be made of different diameters, wall thicknesses, or materials as needed to adapt to different connection structures such as the pressure transmitter end, the field installation end, and the base 3 and chassis 2, achieving a smooth transition and precise fit.

[0066] In one embodiment, the sealing element 7 includes a diamond-shaped sealing ring. It is made of highly elastic, high-pressure resistant, and corrosion-resistant rubber or elastomer materials, such as fluororubber (FKM), ethylene propylene diene monomer (EPDM), and polytetrafluoroethylene (PTFE), and is disposed within an annular cavity. It is suitable for high-temperature, high-pressure, and highly corrosive environments. Furthermore, the diamond-shaped cross-section can form multiple sealing contact lines with the inner wall of the base 3 and the outer wall of the outer tube under pressure, improving sealing reliability.

[0067] The assembly process of this embodiment includes the following steps: First, the capillary tube 9 is inserted into the first outer tube 5, and the capillary tube 9 is firmly connected to the first outer tube 5 using a welding process. Then, the capillary tube 9 is further inserted into the second outer tube 6, and the capillary tube 9 is reliably fixed to the second outer tube 6 using the same welding process. Simultaneously, the first outer tube 5 and the second outer tube 6 are also connected using a welding process to ensure the overall structure's sealing and mechanical strength.

[0068] After completing the above welding connections, the protective sleeve 8 is connected to the back pressure plate 4 via a threaded connection, abandoning the traditional welding connection mode and significantly improving the product's assembly efficiency and ease of later maintenance. The base 3 adopts a split structure, divided into a first base body 3a and a second base body 3b, which facilitates the assembly and disassembly of the capillary tube 9 and also makes the product's later maintenance convenient.

[0069] Finally, the sealing joint 10 and the sealing ring 101 cooperate to achieve a reliable sealing connection of the chassis 2, preventing external liquid from entering the housing and ensuring the long-term stable operation of the entire system under high static pressure conditions.

[0070] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although this utility model has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A capillary sealing connection structure for a remote pressure transmitter, characterized in that, include: Outer shell (1); The chassis (2) is located at the bottom of the outer shell (1); A base (3) is disposed inside the outer shell (1), and the base (3) is provided with a receiving hole; A back pressure plate (4) is disposed inside the outer casing (1), and the back pressure plate (4) is provided with threaded holes; The first outer tube (5) and the second outer tube (6) are both housed in the receiving hole and form a cavity with the receiving hole. A sealing element (7) is provided in the cavity. A protective sleeve (8) is provided at one end of the first outer tube (5), and the other end is connected to one end of the second outer tube (6). The protective sleeve (8) is provided with an external thread structure (81) that is threaded to the threaded hole. The other end of the second outer tube (6) abuts against the chassis (2). The capillary tube (9) is fitted inside the first outer tube (5) and the second outer tube (6); A sealing joint (10) is connected to the chassis (2), and the capillary tube (9) passes through the sealing joint (10).

2. The capillary sealing connection structure for a remote-transmitting pressure transmitter according to claim 1, characterized in that, The chassis (2) has multiple threaded through holes (201), and the sealing joint (10) is threadedly connected to the threaded through holes (201); each threaded through hole (201) is coaxially arranged with the corresponding receiving hole.

3. The capillary sealing connection structure for a remote-transmitting pressure transmitter according to claim 1, characterized in that, The chassis (2) is disc-shaped and includes a first half-disc (2a) and a second half-disc (2b). The first half-disc (2a) and the second half-disc (2b) are detachably connected by bolts. The chassis (2) is also provided with a threaded connection hole (202) connected to the base (3).

4. The capillary sealing connection structure for a remote-transmitting pressure transmitter according to claim 1, characterized in that, A sealing ring (101) is provided between the sealing joint (10) and the chassis (2).

5. The capillary sealing connection structure for a remote-transmitting pressure transmitter according to claim 1, characterized in that, The base (3) includes a first base body (3a) and a second base body (3b). The first base body (3a) and the second base body (3b) are connected by bolts after the concave and convex structure is engaged, so as to achieve detachable connection.

6. The capillary sealing connection structure for a remote-transmitting pressure transmitter according to claim 1, characterized in that, The first outer tube (5) has a groove structure (52) at its end. The second outer tube (6) has a connecting post (61) at one end facing the groove structure (52) and forms a step with that end. The connecting post (61) extends into the groove structure (52) and abuts against the bottom wall of the groove structure (52). The step abuts against the end of the first outer tube (5).

7. The capillary sealing connection structure for a remote-transmitting pressure transmitter according to claim 1, characterized in that, The outer diameter of the first outer tube (5) is greater than the outer diameter of the second outer tube (6).

8. The capillary sealing connection structure for a remote-transmitting pressure transmitter according to claim 1, characterized in that, The protective sleeve (8) is connected to the first outer tube (5) by argon arc welding.

9. The capillary sealing connection structure for a remote-transmitting pressure transmitter according to claim 1, characterized in that, The first outer tube (5) and the second outer tube (6) are connected by argon arc welding.

10. The capillary sealing connection structure for a remote-transmitting pressure transmitter according to claim 1, characterized in that, The seal (7) includes a diamond-shaped seal.

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