A transmitter multi-sealing structure based on laser welding

Abstract

The present invention discloses a transmitter multi-sealing structure based on laser welding, which belongs to the field of transmitter technology. The transmitter multi-sealing structure includes a housing, a base, and a heat dissipation connector. A first sealing component is provided between the base and the heat dissipation connector, and a second sealing component is provided between the housing and the heat dissipation connector. The first sealing component includes a mounting seat, a mounting groove is provided on one side of the mounting seat, annular sealing gaskets are provided on both sides of the mounting groove, and an O-ring is provided between the two annular sealing gaskets near the outer end. The second sealing component includes a sealing ring, and a plurality of spring pieces are provided on the surface of the sealing ring near the housing. The arrangement of the first sealing component and the second sealing component of the present invention forms a multiple sealing defense line, which effectively prevents leakage of the medium, can dynamically adjust the sealing pressure according to changes in working conditions, compensate for the sealing gap caused by wear, vibration and temperature changes, and ensure long-term stable sealing effect.

Description

Technical Field

[0001] The present invention relates to the technical field of transmitters, and more particularly to a multiple sealing structure of a transmitter based on laser welding. Background Art

[0002] In the field of industrial automation, transmitters are key devices that convert physical quantities into measurable electrical signals. Their sealing performance is directly related to measurement accuracy, device lifespan, and system safety. As industrial environments become increasingly complex, extreme operating conditions such as high temperature, high pressure, and severe corrosion place higher demands on transmitter sealing structures. Traditional transmitters often use mechanical seals, rubber gaskets, or conventional welding, which present numerous technical bottlenecks.

[0003] Mechanical seals rely on the tight fit of sealing surfaces to achieve a seal, but they are susceptible to vibration and wear over long periods of operation, which can increase the gap between the sealing surfaces and cause media leakage. Conventional welding sealing technologies, such as argon arc welding and arc welding, create a large heat-affected zone during welding, which can easily cause changes in material structure, resulting in reduced weld joint strength and unstable sealing performance. Furthermore, welding defects (such as pores and cracks) are difficult to completely avoid, and these defects can become potential channels for media leakage.

[0004] In recent years, laser welding technology has emerged as a leader in precision welding thanks to its advantages, including high energy density, non-contact processing, and minimal heat-affected zone. However, applying laser welding directly to transmitter seals still faces challenges: single laser welding seals struggle to cope with complex and changing operating conditions and cannot simultaneously meet multiple requirements, such as corrosion protection, high and low temperature resistance, and vibration resistance. To address this, we propose a multi-seal transmitter structure based on laser welding. Summary of the Invention

[0005] The object of the present invention is to provide a transmitter multi-sealing structure based on laser welding to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A transmitter multi-sealing structure based on laser welding includes a housing, a base provided at one end of the housing, a heat dissipation connector provided between the housing and the base, a first sealing component provided between the base and the heat dissipation connector, and a second sealing component provided between the housing and the heat dissipation connector;

[0008] The first sealing assembly includes a mounting seat, which is arranged on the base, and a mounting groove is defined on one side of the mounting seat. An annular sealing gasket is disposed oppositely on both sides of the mounting groove. An O-ring is disposed between the two annular sealing gaskets near one end thereof, and the outer end of the annular sealing gasket extends to the outside of the mounting groove.

[0009] The second sealing component includes a sealing ring, which is a conical structure. A plurality of spring pieces are provided on the surface of the sealing ring close to the housing.

[0010] Preferably, one end of the outer side of the annular sealing gasket is set as an inclined surface, and multiple mounting holes are opened on the inner side surfaces of the two annular sealing gaskets. A limiting mechanism is set in the mounting hole, and the limiting mechanism is in contact with the O-ring.

[0011] Preferably, the limiting mechanism includes a spring and a limiting ball, the spring is arranged in the mounting hole, the end of the spring is connected to the limiting ball, the limiting ball is located outside the mounting hole, and the limiting ball is in contact with the O-ring.

[0012] Preferably, a first groove is formed on the base, the mounting seat is arranged in the first groove, and the first groove is an annular structure.

[0013] Preferably, a second groove is provided at the end of the shell, the sealing ring is provided in the second groove, both ends of the sealing ring are respectively connected to the inner walls at both ends of the second groove, and one side surface of the elastic sheet contacts the inner wall in the middle of the second groove.

[0014] Preferably, a pressure connector is provided in the housing, one end of the pressure connector extends into the heat dissipation connector; one end of the heat dissipation connector extends into the base;

[0015] Fluororubber sealing rings are provided between the heat dissipation connector and the inner wall of the base, and between the pressure connector and the inner wall of the heat dissipation connector.

[0016] Preferably, a pressure sensitive element is provided in the pressure connector, and an O-ring is provided between the pressure sensitive element and the inner wall of the pressure connector;

[0017] A signal amplifier is provided at one end of the pressure connector, an insulating sleeve is provided in the shell, the signal amplifier is installed inside the insulating sleeve, and the inside of the insulating sleeve is filled with epoxy resin potting glue.

[0018] Preferably, the base and the heat dissipation connector are filled with magnesium oxide powder.

[0019] Preferably, a probe rod is provided at one end of the outer side of the base, a temperature sensitive element is provided at the bottom of the probe rod, the temperature sensitive element is connected to the signal amplifier through a wire, and the outer wall of the wire is made of insulating high-temperature resistant material.

[0020] Preferably, the elastic piece is composed of two inclined connecting parts, an obtuse angle is formed between the two connecting parts, and the outer ends of the two connecting parts are connected to the surface of the sealing ring.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) The arrangement of the first and second sealing assemblies of the present invention enables the connection between the base and the heat dissipation connector, and between the heat dissipation connector and the housing, to form multiple sealing lines of defense, effectively preventing leakage of the medium. At the same time, the annular sealing gasket, O-ring density ring, conical sealing ring, and spring clip structures cooperate with each other to dynamically adjust the sealing pressure according to changes in working conditions, compensate for sealing gaps caused by wear, vibration, and temperature changes, and ensure long-term stable sealing effects. Furthermore, the modular design of each sealing assembly facilitates quick installation and disassembly, reducing maintenance time and costs and improving the maintainability of the equipment.

[0023] (2) The inclined surface design of the sealing gasket and the spring thrust of the limiting mechanism of the present invention can disperse stress and avoid local stress concentration that may cause damage to the sealing material. In addition, the sealing pressure can be automatically adjusted according to pressure changes, dynamically compensating for the sealing gap caused by changes in working conditions, thereby extending the service life of the sealing component. The spring, limiting ball and other structures play a buffering and damping role, absorbing vibration energy, preventing the sealing component from shifting or loosening due to vibration, ensuring the stability of the sealing structure under vibration conditions, and improving the reliability of the transmitter in complex working environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a schematic cross-sectional view of the overall structure of the present invention;

[0026] Figure 3 For the present invention Figure 2 An enlarged schematic diagram of the first sealing component;

[0027] Figure 4 For the present invention Figure 2 An enlarged schematic diagram of the second sealing component;

[0028] Figure 5 It is a partial cross-sectional schematic diagram of the first sealing assembly of the present invention;

[0029] Figure 6 It is a three-dimensional schematic diagram of the second sealing component of the present invention.

[0030] Explanation of the numbers in the figure: 1. Temperature sensitive element; 2. Wire; 3. Base; 4. Fluororubber sealing ring; 5. Heat dissipation connector; 6. Pressure connector; 7. Pressure sensitive element; 8. Locking ring; 9. Signal amplifier; 10. Housing; 11. First sealing assembly; 1101. Mounting seat; 1102. Annular sealing gasket; 1103. O-ring; 1104. Spring; 1105. Limiting ball; 12. Second sealing assembly; 1201. Sealing ring; 1202. Shrapnel. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0032] Example:

[0033] See also Figure 1-6 A multiple sealing structure of a transmitter based on laser welding includes a shell 10, a base 3 is set at one end of the shell 10, the base 3 and the shell 10 are both made of stainless steel, a heat dissipation connector 5 is set between the shell 10 and the base 3, a first sealing component 11 is set between the base 3 and the heat dissipation connector 5, for achieving a sealed connection between the base 3 and the heat dissipation connector 5, and a second sealing component 12 is set between the shell 10 and the heat dissipation connector 5 for achieving a sealed connection between the shell 10 and the heat dissipation connector 5.

[0034] The first sealing component 11 includes a mounting seat 1101, which is arranged on the base 3, wherein a first groove is opened on the base 3, and the mounting seat 1101 is arranged in the first groove. The first groove is an annular structure, and the groove is used to position the mounting seat 1101 to prevent the mounting seat 1101 from offsetting during operation. A mounting groove is opened on one side of the mounting seat 1101, and an annular sealing gasket 1102 is arranged on both sides of the mounting groove. The two annular sealing gaskets 1102 are connected and fixed to the mounting seat 1101. The two annular sealing gaskets 1102 are connected and fixed to the mounting seat 1101. An O-ring 1103 is positioned between the annular gaskets 1102, near their outer ends. The outer ends of the annular gaskets 1102 extend beyond the mounting groove. A curved surface on the inner side of the annular gaskets 1102 mates with the O-ring 1103, restricting its position. This interaction ensures a more stable seal between the base 3 and the heat sink connector 5, preventing loosening due to vibration or external forces. The combination of the two annular gaskets 1102 and the O-ring 1103 ensures that when pressure is applied, the O-ring 1103 is squeezed and deformed. The elasticity and curved surface of the annular gaskets 1102 effectively absorb the resulting displacement, providing dynamic compensation. This adaptive capability ensures a good seal even under fluctuating pressure conditions, preventing seal failure due to pressure fluctuations. The annular gaskets 1102 extend beyond the mounting groove, creating a double barrier to entry. Even if the external sealing surface develops a tiny gap due to wear or corrosion, the internal O-ring 1103 and annular gasket 1102 will still prevent leakage. Furthermore, the gap between the two annular gaskets 1102 acts as a buffer and diverter in the event of a leak, facilitating the timely detection and resolution of potential leaks. Made of corrosion-resistant materials, annular gaskets 1102 and O-ring 1103 not only prevent leakage of the internal medium but also isolate moisture, corrosive gases, or particulate impurities from the external environment from entering the space between base 3 and heat dissipation connector 5, preventing them from corroding or interfering with the internal structure and extending the device's service life.

[0035] The second sealing assembly 12 includes a sealing ring 1201, which has a conical structure. A plurality of spring clips 1202 are provided on the surface of the sealing ring 1201 close to the housing 10. The upper arrangement of the plurality of spring clips 1202 enables the sealing ring 1201 to be in close contact with the heat dissipation connector 5, thereby improving the sealing effect. When the conical sealing ring 1201 is in contact with the heat dissipation connector 5, as the external pressure or temperature changes, the spring clip 1202 can produce elastic deformation, automatically adjusting the contact pressure between the sealing ring 1201 and the heat dissipation connector 5. When the pressure increases, the spring clip 1202 further bends and presses the contact surface; when the pressure decreases, the spring clip 1202 restores its elasticity, maintains a stable sealing force, and ensures that a tight seal can be maintained under fluctuating working conditions. The elastic properties of the spring clip 1202 can effectively compensate for dimensional errors, surface unevenness, and other problems generated during the manufacturing and assembly process of the heat dissipation connector 5 and the housing 10. The deformation of the shrapnel 1202 pushes the sealing ring 1201 to deform and fill the tiny gap, so that the sealing ring 1201 and the surface of the heat dissipation connector 5 can be tightly fitted in all directions, avoiding the risk of leakage caused by assembly defects. The shrapnel 1202 can also play a buffering and damping role, absorb vibration energy, and reduce the relative displacement between the sealing ring and the heat dissipation connector 5. At the same time, the lateral pressure exerted by the shrapnel 1202 on the sealing ring helps prevent it from loosening or shifting during vibration, ensuring the long-term reliability of the sealing structure. The conical structure of the sealing ring 1201 combined with the shrapnel 1202 can form a multiple protective barrier. The shrapnel not only enhances the sealing performance of the sealing ring, but also blocks the intrusion of external impurities such as dust, water vapor, corrosive media, etc. to a certain extent, preventing them from entering the interior of the equipment, effectively protecting the heat dissipation connector 5 and other key components, and extending the service life of the equipment.

[0036] In the present application, one end of the outer side of the annular sealing gasket 1102 is set as an inclined surface. The inclined surface design of the outer side of the annular sealing gasket 1102 can disperse the concentrated stress into a component force along the inclined surface when subjected to pressure, thereby avoiding damage or deformation of the sealing material caused by excessive local stress and preventing the risk of leakage caused by stress concentration. The inner side of each of the two annular sealing gaskets 1102 is provided with multiple mounting holes, and a limiting mechanism is set in the mounting holes. The limiting mechanism is in contact with the O-ring 1103. The setting of the limiting mechanism provides a certain thrust for the O-ring 1103, so that it is in close contact with the heat dissipation connector 5.

[0037] In the present application, the limiting mechanism includes a spring 1104 and a limiting ball 1105. The spring 1104 is arranged in the mounting hole. The end of the spring 1104 is connected to the limiting ball 1105. The limiting ball 1105 is located outside the mounting hole. The diameter of the limiting ball 1105 is smaller than the aperture of the mounting hole. The limiting ball 1105 is in contact with the O-ring 1103. The thrust of the spring 1104 on the limiting ball 1105 is used to push the O-ring 1103 to make it in close contact with the heat dissipation connector 5. The point contact form between the limiting ball 1105 and the O-ring 1103, combined with the elastic buffer of the spring 1104, can effectively absorb vibration energy and prevent the O-ring 1103 from being displaced or loosened due to vibration. The rebound force of the spring can continuously press the limiting ball against the sealing ring to ensure the stability of the sealing structure in a high-frequency vibration environment.

[0038] In this application, a second groove is provided at the end of the shell 10, and the sealing ring 1201 is provided in the second groove. The two ends of the sealing ring 1201 are respectively connected to the inner walls at both ends of the second groove. The surface of one side of the spring piece 1202 is in contact with the inner wall in the middle of the second groove. The spring piece 1202 provides thrust to make the sealing ring 1201 in close contact with the heat dissipation connector 5.

[0039] In a possible embodiment, the spring pieces 1202 are arranged in a ring shape and in multiple rows. The spring pieces 1202 in each row are staggered with each other, so that the sealing ring 1201 can be pushed by the spring pieces 1202 in the circumferential direction.

[0040] In this application, a pressure connector 6 is provided in the housing 10, one end of the pressure connector 6 extends into the heat dissipation connector 5; one end of the heat dissipation connector 5 extends into the base 3; a fluororubber sealing ring 4 is provided between the heat dissipation connector 5 and the inner wall of the base 3 and between the pressure connector 6 and the inner wall of the heat dissipation connector 5, and high-pressure sealing of the medium is achieved through the fluororubber sealing ring 4.

[0041] Among them, the heat dissipation connector 5 is connected to the base 3 through a threaded structure of the same specification as the pressure connector 6, and a high-pressure seal of the medium is achieved through a fluororubber sealing ring 4. Furthermore, the outside of the base 3 is sealed from the outside world by laser welding with the heat dissipation connector 5, and the stainless steel shell 10 is sealed from the outside world by laser welding with the heat dissipation connector 5. The upper part of the shell 10 is connected to a specific connector through a thread or is similar to the existing structure to perform IP68 sealing on the cable.

[0042] In the present application, a pressure sensitive element 7 is provided in the pressure connector 6, and an O-ring is provided between the pressure sensitive element 7 and the inner wall of the pressure connector 6; the pressure sensitive element 7 is equipped with an O-ring to achieve sealing with the inner cavity side wall of the pressure connector 6, and the locking ring 8 and the pressure connector 6 are screwed into and tightened to compress the pressure sensitive element 7 through threads.

[0043] A signal amplifier 9 is mounted on one end of the pressure connector 6. An insulating sleeve is located within the housing 10. The sleeve is tightly fitted to the end of the pressure connector 6, and the signal amplifier 9 is mounted within the insulating sleeve, which is then filled with epoxy resin potting compound. This filling of the insulating sleeve completely submerges the signal amplifier 9, isolating it from oxygen and moisture, and thus extending the life of the transmitter.

[0044] In this application, the base 3 and the heat dissipation connector 5 are filled with magnesium oxide powder to ensure effective transfer of the medium temperature and to ensure heat dissipation of the high-temperature medium during pressure measurement to protect the pressure sensitive element 7 from damage.

[0045] In this application, a probe is provided at one end of the outer side of the base 3, and a temperature-sensitive element 1 is provided at the bottom of the probe. The temperature-sensitive element 1 is connected to the signal amplifier 9 via a wire 2, the outer wall of which is made of an insulating and high-temperature resistant material. The real-time temperature of the measured medium is transmitted to the temperature-sensitive element 1 through the probe at the front end of the stainless steel base 3. The output signal of the temperature-sensitive element 1 is transmitted to the signal amplifier 9 via the insulated and high-temperature resistant wire 2. After being processed by the signal amplifier 9, it is output through the connector at the rear of the transmitter or the waterproof gas-conducting cable.

[0046] In the present application, the spring piece 1202 is composed of two inclined connecting parts, an obtuse angle is formed between the two connecting parts, and the outer ends of the two connecting parts are connected to the surface of the sealing ring 1201.

[0047] Working principle: The base 3 is fixed to the container of the measured medium through threads and sealed with the container of the measured medium through an ED sealing ring. The measured medium transmits the real-time pressure of the measured medium to the pressure sensitive element 7 through the pressure-introducing hole in the center of the base 3. The medium can effectively reduce the temperature of the measured medium to a temperature range acceptable to the pressure sensitive element 7 in the process of passing through the heat dissipation connector 5, thereby avoiding damage to the pressure sensitive element 7 by high temperature. The output signal of the pressure sensitive element 7 is transmitted to the signal amplifier 9 through a silicone wire, and is processed by the signal amplifier 9 and output by the connector at the tail of the transmitter or the waterproof gas guide cable.

[0048] The temperature sensitive element 1 is installed at the bottom of the probe rod of the base 3. The probe rod can also be appropriately lengthened. The probe rod and the base 3 can also be made into a whole. The two can also be assembled by threading and then laser welded to reduce the processing difficulty of the whole part, thereby reducing production costs. Since the probe is in direct contact with the medium, the temperature sensitive element 1 can be as close to the medium as possible, avoiding heat loss during the transmission of the medium temperature, which causes a large temperature measurement error. The temperature sensitive element 1 is connected to the signal amplifier 9 through the wire 2. The base 3 and the heat dissipation connector 5 are filled with magnesium oxide powder to ensure the effective transmission of the medium temperature. The real-time temperature of the measured medium is transmitted to the temperature sensitive element 1 through the probe rod at the front end of the base 3. The output signal of the temperature sensitive element 1 is transmitted to the signal amplifier 9 through the wire 2, and is processed by the signal amplifier 9 and output by the connector at the tail of the transmitter or the waterproof gas guide cable. This application combines the temperature and pressure transmitter into one, and through a special assembly process, realizes the accurate measurement of temperature and high precision as well as large pressure.

[0049] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A transmitter multi-sealing structure based on laser welding, comprising a housing (10), wherein a base (3) is provided at one end of the housing (10), and characterized in that: A heat dissipation connector (5) is provided between the housing (10) and the base (3), a first sealing component (11) is provided between the base (3) and the heat dissipation connector (5), and a second sealing component (12) is provided between the housing (10) and the heat dissipation connector (5); The first sealing assembly (11) includes a mounting seat (1101), the mounting seat (1101) is arranged on the base (3), a mounting groove is provided on one side of the mounting seat (1101), annular sealing gaskets (1102) are arranged on opposite sides of the mounting groove, an O-shaped sealing ring (1103) is arranged between the two annular sealing gaskets (1102) near one end of the outer side, and the outer end of the annular sealing gasket (1102) extends to the outside of the mounting groove; The second sealing assembly (12) comprises a sealing ring (1201), the sealing ring (1201) is a conical structure, and a plurality of spring pieces (1202) are provided on the surface of the sealing ring (1201) on one side close to the housing (10); One end of the outer side of the annular sealing gasket (1102) is set as an inclined surface, and the inner side surfaces of the two annular sealing gaskets (1102) are each provided with a plurality of mounting holes, and a limiting mechanism is set in the mounting hole, and the limiting mechanism is in contact with the O-shaped sealing ring (1103); The limiting mechanism comprises a spring (1104) and a limiting ball (1105), wherein the spring (1104) is arranged in the mounting hole, the end of the spring (1104) is connected to the limiting ball (1105), the limiting ball (1105) is located outside the mounting hole, and the limiting ball (1105) is in contact with the O-ring (1103).

2. The transmitter multi-sealing structure based on laser welding according to claim 1, characterized in that: The base (3) is provided with a first groove, the mounting seat (1101) is arranged in the first groove, and the first groove is an annular structure.

3. The transmitter multi-sealing structure based on laser welding according to claim 1, characterized in that: A second groove is provided at the end of the housing (10), the sealing ring (1201) is provided in the second groove, the two ends of the sealing ring (1201) are respectively connected to the inner walls at both ends of the second groove, and one side surface of the elastic sheet (1202) is in contact with the inner wall in the middle of the second groove.

4. The transmitter multi-sealing structure based on laser welding according to claim 1, characterized in that: A pressure connector (6) is provided in the housing (10), one end of the pressure connector (6) extends into the heat dissipation connector (5); one end of the heat dissipation connector (5) extends into the base (3); Fluororubber sealing rings (4) are provided between the heat dissipation connector (5) and the inner wall of the base (3), and between the pressure connector (6) and the inner wall of the heat dissipation connector (5).

5. The transmitter multi-sealing structure based on laser welding according to claim 4, characterized in that: A pressure sensitive element (7) is provided in the pressure connecting piece (6), and an O-ring is provided between the pressure sensitive element (7) and the inner wall of the pressure connecting piece (6); A signal amplifier (9) is provided at one end of the pressure connector (6), an insulating sleeve is provided in the housing (10), the signal amplifier (9) is installed inside the insulating sleeve, and the insulating sleeve is filled with epoxy resin potting glue.

6. The transmitter multi-sealing structure based on laser welding according to claim 1, characterized in that: The base (3) and the heat dissipation connector (5) are filled with magnesium oxide powder.

7. The transmitter multi-sealing structure based on laser welding according to claim 5, characterized in that: A probe is provided at one end of the outer side of the base (3), and a temperature sensitive element (1) is provided at the bottom of the probe. The temperature sensitive element (1) is connected to the signal amplifier (9) via a wire (2), and the outer wall of the wire (2) is made of an insulating and high-temperature resistant material.

8. The transmitter multi-sealing structure based on laser welding according to claim 1, characterized in that: The spring (1202) is composed of two inclined connecting parts, an obtuse angle is formed between the two connecting parts, and the outer ends of the two connecting parts are connected to the surface of the sealing ring (1201).

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