Gas chamber sealing structure of gas density relay

Abstract

The utility model relates to a gas density relay and a sealing structure thereof, which adopt an end cover to separate a first chamber of a display device from a second chamber of a contact device, so that the first chamber and the second chamber are not communicated with each other, and standard atmospheric pressure gas can be filled into the first chamber to compensate the display device. The influence of high-altitude environment air pressure on the pointer mechanism is eliminated, and the first cavity can be filled with oil to improve the vibration resistance of the pointer mechanism; the second cavity is filled with air chamber air of the electrical equipment and is communicated with the inner cavity of the bourdon pipe to provide air pressure, compensation air is sealed in the corrugated pipe, and therefore the second cavity can serve as a relative cavity of the corrugated pipe, and deformation of the corrugated pipe is compensated.

Description

Technical Field

[0001] This utility model relates to a gas chamber sealing structure for a gas density relay, and more particularly to a gas chamber sealing structure for a gas density relay with good vibration resistance. Background Technology

[0002] Against the backdrop of my country's rapid economic development, SF6 electrical equipment is widely used in power systems and numerous industrial and mining enterprises, injecting strong momentum into the vigorous development of the power industry. As a core component of this type of equipment, the SF6 gas density relay bears the crucial responsibility of monitoring changes in the SF6 gas density within the SF6 electrical equipment itself; its performance directly affects the safe and stable operation of the equipment. Currently, the industry mostly uses mechanical pointer-type SF6 gas density relays to monitor gas density. Once a leak occurs in the SF6 electrical equipment, this density relay can promptly issue alarm and interlock signals, safeguarding the safe operation of the electrical equipment.

[0003] Currently, density relays widely used in the market employ a Baden-Württemberg tube (C-tube) as the pressure-sensing element. The Baden-Württemberg tube is connected to the gas chamber of the electrical equipment, deforming according to changes in gas pressure. A bimetallic strip acts as a compensation element, driving a pointer mechanism to display the gas density or pressure. The contact portion uses a bellows as the pressure-sensing element, driving a microswitch to generate an electrical signal. However, existing density relays often house the Baden-Württemberg tube and the bellows in the same chamber, lacking compensation functionality. Alternatively, while they may have compensation functionality, the chamber's structural design is complex, resulting in low reliability. Utility Model Content

[0004] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a gas density relay and its gas chamber sealing structure, which can easily separate the gas chamber, has a simple structure, and high reliability.

[0005] To achieve the above objectives, this utility model provides a gas chamber sealing structure for a gas density relay. The gas density relay includes a display device and a contact device. The display device has a first chamber for accommodating a mounting base, a Baden tube, and a pointer mechanism. The contact device has a second chamber connected to an inflation connector for accommodating a bellows and a micro switch.

[0006] The first chamber and the second chamber are separated by an end cap. A sealing cover and a sealing shell are respectively installed on the front and rear sides of the end cap. The inner cavity of the sealing cover is the first chamber, and the inner cavity of the sealing shell is the second chamber. The end cap is provided with a connection hole, and the base has a connector. The connector is sealed and inserted into the connection hole. The connector has an air inlet that connects to the Baden tube.

[0007] Preferably, a portion of the connector is sealed into the connection hole, the sealing shell has a insertion tube, and another portion of the connector is sealed into the insertion tube.

[0008] Preferably, the outer wall of the connector is provided with a first sealing groove, and a sealing ring is installed in the first sealing groove.

[0009] Preferably, the base has a sealing surface, the axis of the connector is perpendicular to the sealing surface, the front side of the end cap is provided with a second sealing groove, the second sealing groove surrounds the connector, a sealing ring is provided in the second sealing groove, and the sealing surface and the front side of the end cap are sealed together by the sealing ring.

[0010] Preferably, the rear side of the end cap is provided with a positioning countersunk hole, the positioning countersunk hole is coaxially arranged with the connecting hole, the inner wall of the insertion tube is sealed to the connector, and the outer wall of the insertion tube is inside the positioning countersunk hole.

[0011] Preferably, the end cap is further provided with a filling port, and a sealing plug is detachably connected to the filling port. The filling port is used to fill the first chamber with standard atmospheric pressure gas or oil.

[0012] Preferably, the sealing cover is made of a transparent material, and a protective cover made of metal is fitted over the outside of the sealing cover.

[0013] More preferably, the end cap is provided with an annular positioning groove, the rear end of the sealing cover has an annular plug, the annular plug is inserted into the annular positioning groove, the side wall of the annular positioning groove is provided with a third sealing groove, a sealing ring is installed in the third sealing groove, and the sealing ring is sealed with the side wall of the sealing cover.

[0014] Preferably, a pressure plate is provided on the rear side of the end cap, which presses the end cap tightly against the sealing cover.

[0015] Corresponding to the gas chamber sealing structure of the gas density relay of this utility model, this utility model also provides a gas density relay, including the gas chamber sealing structure of the gas density relay described in the above technical solution or any preferred technical solution.

[0016] As described above, the sealing structure of the gas density relay of this utility model has the following beneficial effects: The sealing structure of the gas density relay of this utility model adopts an end cap to separate the first chamber of the display device and the second chamber of the contact device, so that the first chamber and the second chamber are not connected to each other. Thus, standard atmospheric pressure gas can be filled into the first chamber to compensate for the display device and eliminate the influence of high-altitude environmental air pressure on the pointer mechanism. Oil can also be filled into the first chamber to increase the vibration resistance of the pointer mechanism. The second chamber is filled with the gas chamber gas of the electrical equipment and connected to the inner cavity of the Baden tube to provide gas pressure. The bellows is sealed with compensating gas. In this way, the second chamber can serve as the relative cavity of the bellows, so that the deformation of the bellows is compensated.

[0017] The gas density relay of this utility model also has the above-mentioned beneficial effects, which will not be elaborated here. Attached Figure Description

[0018] Figure 1 The diagram shown is a cross-sectional view of a first embodiment of the gas density relay of this invention.

[0019] Figure 2 Displayed as Figure 1 A magnified view of point C in the middle.

[0020] Figure 3 The diagram shown is a cross-sectional view of a second embodiment of the gas density relay of this invention.

[0021] Figure 4 The diagram shown is a cross-sectional view of a third embodiment of the gas density relay of this invention.

[0022] Figure 5 The diagram shown is a cross-sectional view of the fourth embodiment of the gas density relay of this invention.

[0023] Component designation explanation

[0024] 1 Display device

[0025] 2 Contact device

[0026] 3. Inflation connector

[0027] 4 First Chamber

[0028] 5. Base

[0029] 6 Baden tubes

[0030] 7. Pointer mechanism

[0031] 8. Airway

[0032] 9 Second Chamber

[0033] 10 Corrugated Pipe

[0034] 11. Micro switch

[0035] 12 push rods

[0036] 13 Protective shield

[0037] 14 Sealing Cover

[0038] 15 End Caps

[0039] 16 Observation Window

[0040] 17 Connecting holes

[0041] 18 Connector

[0042] 19 Sealed Casing

[0043] 20 Connector

[0044] 21 Sealing ring

[0045] 22 pressure plate

[0046] 23 First sealing groove

[0047] 24 charging port

[0048] 25 Threaded plug

[0049] 26 Glass Plates

[0050] 27 Second sealing groove

[0051] 28 Intelligent Control Components

[0052] 29. Intermediate shell

[0053] 30 Rear end housing

[0054] 31 Annular positioning groove

[0055] 32 Ring-shaped connector

[0056] 33 Third sealing groove

[0057] 34 Junction Box Detailed Implementation

[0058] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0059] It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are only for illustrative purposes to aid those skilled in the art and are not intended to limit the implementation of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effects and objectives of this utility model, should still fall within the scope of the technical content disclosed in this utility model. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of implementation of this utility model.

[0060] Please refer to Figures 1 to 5 This utility model provides a gas chamber sealing structure for a gas density relay. The gas density relay includes a display device 1 and a contact device 2. The display device 1 has a first chamber 4, which is used to accommodate a mounting base 5, a Baden tube 6, and a pointer mechanism 7. The contact device 2 has a second chamber 9, which is connected to an inflation connector 3 and is used to accommodate a bellows 10 and a micro switch 11. The first chamber 4 and the second chamber 9 are separated by an end cap 15. A sealing cover 14 and a sealing shell 19 are respectively installed on the front and rear sides of the end cap 15. The inner cavity of the sealing cover 14 is the first chamber 4, and the inner cavity of the sealing shell 19 is the second chamber 9. The end cap 15 is provided with a connection hole 17, and the base 5 has a connector 18, which is sealed and inserted into the connection hole 17. The connector 18 has an air inlet that connects to the Baden tube 6.

[0061] The sealing structure of this gas density relay uses an end cap 15 to separate the first chamber 4 of the display device 1 and the second chamber 9 of the contact device 2, ensuring that the first chamber 4 and the second chamber 9 are not interconnected. This allows the first chamber 4 to be filled with standard atmospheric pressure gas to compensate for the display device 1, eliminating the influence of high-altitude atmospheric pressure on the pointer mechanism 7. It also allows the first chamber 4 to be filled with oil to increase the vibration resistance of the pointer mechanism 7. The second chamber 9 is sealed as a gas-sealed cavity, filled with the gas chamber gas of the electrical equipment and connected to the inner cavity of the Baden tube 6 to provide gas pressure. The bellows 10 is sealed with compensating gas. Thus, the second chamber 9 can serve as a relative cavity to the bellows 10, compensating for the deformation of the bellows 10. This gas density relay and its gas chamber sealing structure of this invention can easily separate the gas chambers, has a simple structure, and high reliability.

[0062] The density relay includes a display device 1, a contact device 2, and an inflation connector 3. One end of the Baden tube 6 of the display device 1 is sealed and fixed on the base 5, and the other end of the Baden tube 6 is connected to the pointer mechanism 7. An air passage 8 is provided in the base 5, and the inner cavity of the Baden tube 6 is connected to the air passage 8. The second chamber 9 of the contact device 2 is connected to the inflation connector 3, and the air inlet of the air passage 8 is connected to the second chamber 9. A bellows 10 and a micro switch 11 are provided in the second chamber 9. The inner cavity of the bellows 10 is sealed with pre-charged gas. One end of the bellows 10 is sealed and fixed, and the other end of the bellows 10 is connected to a push rod 12 for triggering the micro switch 11.

[0063] In order to conveniently and reliably isolate the first chamber 4 and the second chamber 9, and to allow the second chamber 9 to introduce the gas from the electrical equipment into the Baden tube 6, such as Figure 2 As shown, a portion of the connector 18 is sealed and inserted into the connecting hole 17. The sealing shell 19 has a insertion tube 21, and the other portion of the connector 18 is sealed and inserted into the insertion tube 21. To achieve a better sealing effect, a first sealing groove 23 is provided on the outer wall of the connector 18, and a sealing ring is installed in the first sealing groove 23. The first sealing groove 23 is provided on the side wall of the connector 18 where the connector 18 mates with the connecting hole 17, and on the side wall of the connector 18 where the connector 18 mates with the insertion tube 21. In addition, the base 5 has a sealing surface, which is located on the side of the base 5 facing the end cover 15. The connector 18 extends from the middle of the sealing surface toward the end cover 15, and the axis of the connector 18 is perpendicular to the sealing surface. A second sealing groove 27 is provided on the front side of the end cover 15, which surrounds the connector 18. A sealing ring is provided in the second sealing groove 27, and the sealing surface and the front side of the end cover are sealed by the sealing ring. To ensure a good fit between the insertion tube 21 of the sealing shell 19 and the connecting hole 17, such as Figure 2 As shown, a positioning countersunk hole is provided on the rear side of the end cap 15. The positioning countersunk hole is coaxially arranged with the connecting hole 17. The inner wall of the insertion tube 21 is sealed with the connector 18. The outer wall of the insertion tube 21 is inside the positioning countersunk hole. The insertion tube 21 is fixedly connected to the pressure plate 22 by a nut. The inner wall of the insertion tube 21 is sealed with the connector.

[0064] Please refer to Figures 1 to 5The bottom of the sealing shell 19 is sealed by a bellows base plate, which is part of the sealing shell 19. An inflation connector 3 is connected to the sealing shell 19. The inflation connector 3 is connected to the insulating gas chamber of the electrical equipment. The gas in the insulating gas chamber of the electrical equipment enters the second chamber 9 of the contact device 2 through the inflation connector 3. An air passage 8 is provided in the base 5. One end of the air passage 8 is connected to the air inlet, and the other end is connected to the Baden tube 6. The second chamber 9 and the air passage 8 on the base 5 are directly connected. Therefore, the gas in the air passage 8 has the same density as the gas in the insulating gas chamber of the electrical equipment. The gas in the air passage 8 enters... In the Baden tube 6, the Baden tube 6, acting as a detection element, undergoes precise deformation based on the gas pressure or density within its cavity, thereby driving the pointer mechanism 7 to indicate an accurate density value. The first chamber 4 can be completely sealed or not sealed, neither connected to the Baden tube 6 nor to the second chamber 9. It can be filled with gas at standard atmospheric pressure as needed to ensure that the Baden tube 6 and pointer assembly remain under standard atmospheric pressure in high-altitude environments, thus avoiding the impact of high altitude on indicating accuracy. Alternatively, it can be filled with oil to prevent vibration from affecting the pointer's indication. To facilitate filling the first chamber 4 with gas or oil, such as... Figure 1 As shown, a filling inlet 24 is also provided on the end cap 15, which is sealed by a threaded plug 25. Gas or oil can be filled into the filling inlet 24, and after filling, the filling inlet 24 is sealed with the threaded plug 25. The bellows 10 is pre-filled with compensating gas, which can be selected as needed to compensate for environmental factors such as temperature, so that the contact device 2 can more accurately measure the gas density in the insulating gas chamber of the electrical equipment.

[0065] The sealing structure of this gas density relay separates the first chamber 4 of the display device 1 and the second chamber 9 of the contact device 2, preventing them from communicating. This allows the first chamber 4 to be filled with standard atmospheric pressure gas to compensate for the display device 1, eliminating the influence of high-altitude atmospheric pressure on the pointer mechanism 7. It also allows the first chamber 4 to be filled with oil to increase the vibration resistance of the pointer mechanism 7. The second chamber 9 is filled with the gas chamber of the electrical equipment and connected to the inner cavity of the Baden tube 6 to provide gas pressure. The bellows 10 is sealed with compensating gas. Thus, the second chamber 9 can serve as a relative cavity to the bellows 10, compensating for the deformation of the bellows 10. Furthermore, the sealing structure of this gas density relay achieves the effect of isolating the gas chambers using the design of the base 5 and the end cap 15, and directly connects the gas path through the gas channel 8, eliminating the need for a metal capillary tube and avoiding breakage caused by vibration during assembly or use. Therefore, the gas density relay and its gas chamber sealing structure of this utility model can easily separate the gas chambers, and the structure is simple and highly reliable.

[0066] To facilitate the filling of the first chamber 4 with gas at standard atmospheric pressure or anti-vibration oil, such as Figure 1 As shown, the end cap 15 is also provided with a filling inlet 24, and a sealing plug is detachably connected to the filling inlet 24. The filling inlet 24 is used to fill the first chamber 4 with standard atmospheric pressure gas or oil. After the gas or oil is filled, the sealing plug is then tightened.

[0067] To ensure a good seal between the end cap 15 and the sealing cover 14, such as Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, the end cap 15 is provided with an annular positioning groove 31, and the rear end of the sealing cover 14 is provided with an annular connector 32. The annular connector 32 at the rear end of the sealing cover 14 is inserted into the annular positioning groove 31. The side wall of the annular positioning groove 31 is provided with a third sealing groove 33, and a sealing ring 21 is installed in the third sealing groove 33. The third sealing ring is in a sealing fit with the side wall of the sealing cover 14. In this way, the annular connector 32 is confined in the annular positioning groove 31, and the annular connector 32 and its surrounding parts are not easily deformed. Since the position of the third sealing groove 33 is very close to the annular connector 32, the part of the sealing ring 21 that is in sealing contact with the sealing cover 14 is also not easily deformed, resulting in good sealing performance.

[0068] Corresponding to the gas chamber sealing structure of the gas density relay of this utility model, this utility model also provides a gas density relay, including the gas chamber sealing structure of the gas density relay described in the above-mentioned technical solution or any preferred technical solution. The gas density relay of this utility model also has the above-mentioned beneficial effects, which will not be elaborated here.

[0069] This utility model also provides a gas density relay in which the gas in the insulating gas chamber of the electrical equipment enters the second chamber 9, the gas passage 8 of the base 5, and the Baden tube 6 through the gas filling connector 3. The Baden tube 6 deforms according to the gas density (density is related to pressure) to drive the pointer mechanism 7 to indicate the gas density. The bellows 10 in the second chamber 9 deforms according to the gas density in the second chamber 9 and the pre-filled gas density in the bellows 10, which drives the top rod 12 to produce a corresponding displacement, thereby triggering the opening and closing of the micro switch 11. The micro switch 11 generates an electrical signal and transmits it to the electrical equipment for processing.

[0070] Example 1:

[0071] like Figure 1As shown, the gas density relay includes a display device 1 and a contact device 2. The display device 1 has a first chamber 4, in which a base 5, a Baden tube 6, and a pointer mechanism 7 are installed. The contact device 2 has a second chamber 9, which is connected to an inflation connector 3. The second chamber 9 contains a bellows 10 and a micro switch 11. The first chamber 4 and the second chamber 9 are separated by an end cover 15. A sealing cover 14 and a sealing shell 19 are respectively installed on the front and rear sides of the end cover 15. The inner cavity of the sealing cover 14 is the first chamber 4, and the inner cavity of the sealing shell 19 is the second chamber 9. The end cover 15 has a connection hole 17. The base 5 has a connector 18, which is sealed and inserted into the connection hole 17. The connector 18 has an air inlet that connects to the Baden tube 6 and is connected to the second chamber 9.

[0072] A protective cover 13 is also fitted outside the sealing cover 14. The front end of the protective cover 13 has an observation window 16. The front end of the sealing cover 14 faces the observation window 16. The opening at the rear end of the sealing cover 14 is sealed by the end cap 15. The space between the sealing cover 14 and the end cap 15 forms a first chamber 4. The end cap 15 is provided with a connection hole 17. The base 5 has a connector 18. The air inlet of the air passage 8 is located at the end of the connector 18. The connector 18 is inserted into the connection hole 17. The connector 18 and the connection hole 17 are sealed together. In this way, the base 5 is fixedly installed on the end cap 15. The Baden tube 6 is sealed and fixedly installed on the base 5. The air inlet end of the Baden tube 6 is connected to the air passage 8 on the base 5. A glass plate 26 is also provided at the front end of the protective cover 13. The glass plate 26 is located between the inwardly extending edge of the observation window 16 and the sealing cover 14. The front end of the sealing cover 14 rests on the glass plate 26, and the glass plate 26 presses against the inwardly extending edge of the observation window 16. A sealing ring is provided between the glass plate 26 and the front end face of the sealing cover 14 to prevent moisture from entering between the front end face of the sealing cover 14 and the glass plate 26 and causing condensation. As mentioned earlier, the space between the sealing cover 14 and the end cap 15 forms the first chamber 4. In order to reliably seal the space between the end cap 15 and the sealing cover 14, the end cap 15 and the sealing cover 14 are sealed by a sealing ring 21. The end cap 15 is machined from a relatively thick metal plate. A third sealing groove 33 is provided on the front side wall of the end cap 15, and the sealing ring 21 is provided in the third sealing groove 33. The sealing cover 14 presses the sealing ring 21 tightly. The contact device 2 has a sealing shell 19, and the inner cavity of the sealing shell 19 is the second chamber 9. Please refer to Figure 2The sealing shell 19 has a forward-protruding insertion tube 21. A portion of the connector 18 is sealed and inserted into the connection hole 17. The sealing shell 19 has an insertion tube 21, and another portion of the connector 18 is sealed and inserted into the insertion tube 21. A first sealing groove 23 is provided on the outer wall of the connector 18, and a sealing ring is installed in the first sealing groove 23. The first sealing groove 23 is provided on the side wall of the connector 18 where it mates with the connection hole 17, and on the side wall of the connector 18 where it mates with the insertion tube 21. Furthermore, the base 5 has a sealing surface, which is located on the side of the base 5 facing the end cap 15. The connector 18 extends from the middle of the sealing surface toward the end cap 15, and the axis of the connector 18 is perpendicular to the sealing surface. A second sealing groove 27 is provided on the front side of the end cap 15, surrounding the connector 18. A sealing ring is provided in the second sealing groove 27, and the sealing surface and the front side of the end cap are sealed together by the sealing ring. Figure 2 As shown, a positioning countersunk hole is provided on the rear side of the end cap 15. The positioning countersunk hole is coaxially arranged with the connecting hole 17. The insertion tube 21 is inserted into the positioning countersunk hole. The inner side wall of the insertion tube 21 cooperates with the connector 18, so that the insertion tube 21 can be firmly inserted into the positioning countersunk hole without being misaligned.

[0073] In order for the end cap 15 to press the sealing cover 14, thereby pressing the sealing cover 14 to press the glass plate 26 and the sealing cavity between the sealing cover 14 and the glass plate 26, a pressure plate 22 is also provided on the rear side of the end cap 15. The pressure plate 22 presses the end cap 15 against the sealing cover 14. The pressure plate 22 is fixedly connected to the protective cover 13 and is pressed on the end cap 15. The sealing shell 19 is fixed on the pressure plate 22, thereby connecting the contact device 2 and the display device 1 together.

[0074] Example 2:

[0075] like Figure 3 As shown, Figure 3 Density relays and Figure 1 The basic structure and principle of the sealing structure of the density relay are the same. The end cover 15 separates the first chamber 4 of the display device 1 and the second chamber 9 of the contact device 2, so that the first chamber 4 and the second chamber 9 are not connected to each other. This allows the first chamber 4 to be filled with standard atmospheric pressure gas to compensate for the display device 1 and eliminate the influence of high-altitude environmental air pressure on the pointer mechanism 7. Oil can also be filled into the first chamber 4 to increase the vibration resistance of the pointer mechanism 7. The second chamber 9 is filled with the gas chamber of the electrical equipment and is connected to the inner cavity of the Baden tube 6 to provide gas pressure. The bellows 10 is sealed with compensating gas. In this way, the second chamber 9 can be used as the relative cavity of the bellows 10, so that the deformation of the bellows 10 is compensated.

[0076] Figure 3 Density relays and Figure 1The main difference in density relays lies in the fact that the bellows 10 is installed horizontally. Figure 3 The right end of the sealing shell 19 is connected to the air inlet connector 3. The sealing shell 19 is also relatively small in size. A junction box 34 is installed on the lower side of the sealing shell 19. The junction box 34 is used to install electrical control components. The electrical control components are connected to the micro switch 11 in the sealing shell 19.

[0077] Example 3:

[0078] like Figure 4 As shown, Figure 4 Density relays and Figure 1 The basic structure and principle of the sealing structure of the density relay are the same. The end cover 15 separates the first chamber 4 of the display device 1 and the second chamber 9 of the contact device 2, so that the first chamber 4 and the second chamber 9 are not connected to each other. This allows the first chamber 4 to be filled with standard atmospheric pressure gas to compensate for the display device 1 and eliminate the influence of high-altitude environmental air pressure on the pointer mechanism 7. Oil can also be filled into the first chamber 4 to increase the vibration resistance of the pointer mechanism 7. The second chamber 9 is filled with the gas chamber of the electrical equipment and is connected to the inner cavity of the Baden tube 6 to provide gas pressure. The bellows 10 is sealed with compensating gas. In this way, the second chamber 9 can be used as the relative cavity of the bellows 10, so that the deformation of the bellows 10 is compensated.

[0079] Figure 4 Density relays and Figure 1 The main difference between the density relays lies in the structural form of the base 5, but this does not change their basic sealing form and function. Figure 3 The connection hole 17 on the end cap 15 of the display device 1 is located at the center of the end cap 15, and the connector 18 on the base 5 is also located at the center of the end cap 15 so that it can be adapted to the connection hole 17. The air passage 8 extends outward from the center of the connector 18 to communicate with the air inlet of the Baden tube 6.

[0080] Example 4:

[0081] like Figure 5 As shown, Figure 5 Density relays and Figure 1The basic structure and principle of the sealing structure of the density relay are the same. The end cover 15 separates the first chamber 4 of the display device 1 and the second chamber 9 of the contact device 2, so that the first chamber 4 and the second chamber 9 are not connected to each other. This allows the first chamber 4 to be filled with standard atmospheric pressure gas to compensate for the display device 1 and eliminate the influence of high-altitude environmental air pressure on the pointer mechanism 7. Oil can also be filled into the first chamber 4 to increase the vibration resistance of the pointer mechanism 7. The second chamber 9 is filled with the gas chamber of the electrical equipment and is connected to the inner cavity of the Baden tube 6 to provide gas pressure. The bellows 10 is sealed with compensating gas. In this way, the second chamber 9 can be used as the relative cavity of the bellows 10, so that the deformation of the bellows 10 is compensated.

[0082] Figure 5 Density relays and Figure 1 Unlike density relays, Figure 5 The density relay in the middle is connected to the intermediate housing 29 and the rear housing 30 at the rear end of the protective cover 13. The intermediate housing 29 and the rear housing 30 are connected. A sealed cavity is formed between the intermediate housing 29, the rear housing 30 and the end cap 15. The bellows 10, the micro switch 11 and the push rod 12 are installed in the intermediate housing 29. The inflation connector 3 is set on the fixed plate at the bottom of the sealed housing 19 and is connected to the inner cavity of the sealed housing 19. The outer diameter of the intermediate housing 29 and the rear housing 30 is the same as or close to the outer diameter of the protective cover 13, and they are coaxially installed together. In this way, the intermediate housing 29, the rear housing 30 and the protective cover 13 are assembled together to form a cylindrical structure with equal or close outer diameters. Thus, as Figure 5 As shown, the overall shape and structure of the density relay are similar to those of existing density relays, eliminating the need for separate testing and verification of the appearance before operation. An intelligent control component 28 is housed in the rear housing 30. This component includes an intelligent microprocessor, a pressure sensor, a temperature sensor, a power module, and a communication module. The intelligent microprocessor calculates the gas density value based on the pressure and temperature values ​​collected by the pressure and temperature sensors. The communication module uploads the calculated gas density value to the target device or platform.

[0083] Based on the technical solutions of the above embodiments, the gas density relay and its sealing structure of this utility model can conveniently and reliably separate the gas chamber and connect the gas path, allowing the first chamber of the display device to be filled with standard atmospheric pressure gas or anti-vibration oil, and the second chamber to be filled with the gas chamber gas of the electrical equipment and connected to the inner cavity of the Baden tube to provide gas pressure. The second chamber can serve as the relative cavity of the bellows, thus compensating for the deformation of the bellows. Therefore, the gas density relay and its gas chamber sealing structure of this utility model can conveniently separate the gas chamber, has a simple structure, and high reliability. Moreover, since there is no need to use a metal capillary tube, it avoids the breakage of the metal capillary tube due to vibration during assembly or use.

[0084] In summary, this utility model effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0085] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A gas chamber sealing structure for a gas density relay, the gas density relay comprising a display device and a contact device, the display device having a first chamber for accommodating a mounting base, a Baden tube, and a pointer mechanism; the contact device having a second chamber communicating with an inflation connector, the second chamber for accommodating a mounting bellows and a micro switch; characterized in that... The first chamber and the second chamber are separated by an end cap. A sealing cover and a sealing shell are respectively installed on the front and rear sides of the end cap. The inner cavity of the sealing cover is the first chamber, and the inner cavity of the sealing shell is the second chamber. The end cap is provided with a connection hole, and the base has a connector. The connector is sealed and inserted into the connection hole. The connector has an air inlet that connects to the Baden tube.

2. The gas chamber seal structure of the gas density relay according to claim 1, characterized by: A portion of the connector is sealed and inserted into the connection hole, the sealing shell has a insertion tube, and another portion of the connector is sealed and inserted into the insertion tube.

3. The gas chamber seal structure of the gas density relay according to claim 1, characterized by: The outer wall of the connector is provided with a first sealing groove, and a sealing ring is installed in the first sealing groove.

4. The gas chamber seal structure of the gas density relay according to claim 1, characterized by: The base has a sealing surface, the axis of the connector is perpendicular to the sealing surface, the front side of the end cap is provided with a second sealing groove, the second sealing groove surrounds the connector, a sealing ring is provided in the second sealing groove, and the sealing surface and the front side of the end cap are sealed together by the sealing ring.

5. The gas chamber seal structure of the gas density relay according to claim 2, characterized by: The rear side of the end cap is provided with a positioning countersunk hole, which is coaxially arranged with the connecting hole. The inner wall of the insertion tube is sealed to the connector, and the outer wall of the insertion tube is inside the positioning countersunk hole.

6. The gas chamber seal structure of the gas density relay according to claim 1, characterized by: The end cap is also provided with a filling port, and a sealing plug is detachably connected to the filling port. The filling port is used to fill the first chamber with standard atmospheric pressure gas or oil.

7. The gas chamber seal structure of the gas density relay according to claim 1, characterized by: The sealing cover is made of transparent material, and a protective cover made of metal is fitted over the outside of the sealing cover.

8. The gas chamber seal structure of the gas density relay according to claim 7, characterized by: The end cap is provided with an annular positioning groove, and the rear end of the sealing cover has an annular plug, which is inserted into the annular positioning groove. The side wall of the annular positioning groove is provided with a third sealing groove, and a sealing ring is installed in the third sealing groove. The sealing ring is sealed and fitted with the side wall of the sealing cover.

9. The gas chamber seal structure of the gas density relay according to claim 8, characterized by: The end cap is also provided with a pressure plate on its rear side, which presses the end cap against the sealing cover, or the end cap is provided with an intermediate shell at its rear end, which presses against the end cap.

10. A gas density relay characterized by, The gas chamber sealing structure of the gas density relay as described in claim 1 is included.

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