Shell structure of cylindrical gas density relay

Abstract

According to the cylindrical gas density relay and the shell structure thereof, the inner cavity of the sealing cover and the inner cavity of the second shell are isolated in an airtight mode through the end cover, the inner cavity of the sealing cover is used for installing a Bourdon tube and a pointer mechanism, and the inner cavity of the second shell is used for installing a corrugated pipe and a microswitch, so that the sealing cover is not prone to falling off. And the two inner cavities can be filled with compensation gases with different pressures according to requirements without mutual influence. Moreover, the protective cover is cylindrical, the second shell is a cylindrical cover, and the front end of the second shell is coaxially connected to the rear end of the protective cover, so that the shell structure of the density relay is relatively simple, the overall structure is cylindrical, and the appearance structure of the density relay meets the requirement of a circuit equipment type test on the appearance of the density relay; and the system can be put into power grid operation without re-performing a type test.

Description

Technical Field

[0001] This utility model relates to the housing structure of a cylindrical gas density relay, belonging to the field of gas density monitoring. Background Technology

[0002] With the rapid development of my country's economy, SF6 electrical equipment, thanks to its excellent insulation and arc-extinguishing characteristics, has been widely adopted in power systems and numerous industrial and mining enterprises, providing strong support for the prosperity and development of the power industry. As a key component of such equipment, the SF6 gas density relay is primarily responsible for monitoring changes in the SF6 gas density within the SF6 electrical equipment itself. Its performance directly determines whether the equipment can operate safely and stably. Currently, the industry commonly uses mechanical pointer-type SF6 gas density relays to detect gas density. When SF6 electrical equipment leaks, this density relay can quickly issue alarm and lockout signals, ensuring the normal operation of the electrical equipment.

[0003] Currently widely used density relays employ a C-tube, or Baden tube, as the pressure-sensing element in their display section. The Baden tube is connected to the gas chamber of the electrical equipment and deforms according to changes in gas pressure. A bimetallic strip acts as a compensation element, driving the pointer mechanism to display the gas density or pressure. The contact section uses a bellows as the pressure-sensing element, driving a microswitch to generate an electrical signal. However, current density relays typically place the Baden tube and bellows in the same chamber. This often results in either a lack of compensation or, while compensation is present, a complex chamber design, leading to a complex outer casing that is not a basic cylindrical shape. This discrepancy between the relay's external structure and the type test design necessitates a re-test before it can be put into operation on the power grid. 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 cylindrical gas density relay and its housing structure, which can meet the requirements of type testing, has a simple external structure, and has a low production cost.

[0005] To achieve the above objectives, this utility model provides a housing structure for a cylindrical gas density relay, comprising a first housing and a second housing. The first housing includes a sealing cover, an end cap, and a protective cover, with a sealed cavity formed between the sealing cover and the end cap. The protective cover is cylindrical and fitted over the outer side of the sealing cover. The front end of the protective cover has an observation window. The sealing cover is made of transparent material, and the opening at the rear end of the sealing cover is sealed by the end cap. The inner cavity of the sealing cover has a first base for mounting a Baden tube, and the first base has a gas passage communicating with the inner cavity of the Baden tube. The second housing is a cylindrical cover, with its front end coaxially connected to the rear end of the protective cover. The rear end of the second housing is sealed. The inner cavity of the second housing has a second base with an installation port for mounting a sealing cylinder and communicating with the inner cavity of the sealing cylinder. The sealing cylinder is used to accommodate and mount a bellows and a micro switch. An inflation connector is also mounted on the second base, which communicates with the gas passage of the first base and the installation port of the second base. The inflation connector is used to connect to the insulating gas chamber of the electrical equipment.

[0006] Preferably, a first sealing gasket is provided between the edge of the front end of the second housing and the rear side of the end cap, and the first sealing gasket seals the connection between the edge of the front end of the second housing and the rear side of the end cap.

[0007] Preferably, the end cap is provided with a connection hole, the first base is provided with a connector, the air passage extends to the end of the connector, and a part of the connector is sealed in the connection hole; the second base is provided with a plug tube, the plug tube communicates with the mounting port of the second base, and the other part of the connector is sealed in the plug tube.

[0008] More preferably, the outer diameter of the intermediate housing is the same as that of the rear housing.

[0009] More preferably, a sealing cover is detachably connected to the rear end of the rear end housing, and a second sealing gasket is provided between the sealing cover and the rear end edge of the rear end housing, the second sealing gasket sealingly connecting the rear end edge of the rear end housing with the sealing cover of the end cap.

[0010] Furthermore, the intermediate housing is used to accommodate the installation of the sealing cylinder, and the rear housing is used to accommodate the installation of the intelligent control component.

[0011] Furthermore, the corrugated pipe is fixed to the second base, and the air inflator is also fixed to the second base.

[0012] Corresponding to the cylindrical gas density relay of this utility model, this utility model also provides a cylindrical gas density relay, including the housing structure of the cylindrical gas density relay described in the above technical solution.

[0013] As described above, the cylindrical gas density relay and its housing structure disclosed in this utility model have the following beneficial effects: The housing structure of the cylindrical gas density relay of this utility model utilizes an end cap and a sealing cover to form a sealed cavity. A first base is provided in the cavity for mounting a Baden tube. The inner cavity of the second housing has an installation port for mounting a sealing cylinder and connecting to the inner cavity of the sealing cylinder. The sealing cylinder is used to accommodate and install a bellows and a micro switch. The inflation connector on the second base is connected to the air passage of the first base and the installation port of the second base. In this way, the sealed cavity of the first housing can be filled with compensating gas or anti-vibration oil as needed. The sealing cylinder is filled with insulating gas from the electrical equipment gas chamber through the inflation connector, and the inner cavity of the bellows is filled with compensating gas. The inner cavity of the sealing cylinder serves as a relative cavity, and the amount of movement of the bellows acting on the micro switch can be compensated. Moreover, since the protective cover is cylindrical and the second housing is a cylindrical cover, with the front end of the second housing coaxially connected to the rear end of the protective cover, the housing structure of the density relay is relatively simple, and the overall structure is cylindrical. The external structure of the density relay meets the requirements of the circuit equipment type test for the shape of the density relay, and it can be put into operation on the power grid without re-conducting type tests.

[0014] The cylindrical gas density relay of this utility model also has the above-mentioned beneficial effects, which will not be elaborated here. Attached Figure Description

[0015] Figure 1 The image shown is a cross-sectional view of the cylindrical gas density relay housing structure of this utility model.

[0016] Figure 2 The image shown is a cross-sectional view of the cylindrical gas density relay of this utility model.

[0017] Figure 3 The image shown is a perspective view of the cylindrical gas density relay of this utility model.

[0018] Figure 4 The diagram shown is a structural schematic of the rear housing.

[0019] Figure 5 The diagram shown is a structural schematic of the sealing cap.

[0020] Component designation explanation

[0021] 1 First shell

[0022] 2 Second shell

[0023] 3. Inflation connector

[0024] 4 First sealing gasket

[0025] 5 First base

[0026] 6 Baden pipe

[0027] 7. Pointer mechanism

[0028] 8. Airway

[0029] 9 Second sealing gasket

[0030] 10 Corrugated Pipe

[0031] 11. Micro switch

[0032] 12 push rods

[0033] 13 Protective shields

[0034] 14 Sealing Cover

[0035] 15 End Caps

[0036] 16 Observation Window

[0037] 17 Connecting holes

[0038] 18 Connector

[0039] 19 Sealing cap

[0040] 20 Connector

[0041] 21 Sealing ring

[0042] 22. Flanged rear end of the intermediate shell

[0043] 23. Flanged front end of rear housing

[0044] 24 charging port

[0045] 25 Threaded plug

[0046] 26 Glass Plates

[0047] 27 Second base

[0048] 28 Intelligent Control Components

[0049] 29. Intermediate shell

[0050] 30 Rear end housing

[0051] 31 Cable connector

[0052] 32 folded edge

[0053] 33 Card Slots

[0054] 34 mounting ports

[0055] 35 Sealing cylinder Detailed Implementation

[0056] 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.

[0057] 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.

[0058] Please refer to Figure 1 This utility model provides a housing structure for a cylindrical gas density relay, including a first housing 1 and a second housing 2. The first housing 1 includes a sealing cover 14, an end cap 15, and a protective cover 13. The protective cover 13 is cylindrical and is fitted over the outer side of the sealing cover 14. The front end of the protective cover 13 has an observation window 16. The sealing cover 14 is made of transparent material, and the opening at the rear end of the sealing cover 14 is sealed by the end cap 15. The inner cavity of the sealing cover 14 is provided with a first base 5 for mounting a Baden tube 6. The first base 5 has a gas passage 8 communicating with the inner cavity of the Baden tube 6. The second housing 2 is a cylindrical cover. The front end of the second housing 2 is coaxially connected to the rear end of the protective cover 13. The rear end of the second housing 2 is sealed. The inner cavity of the second housing 2 is provided with a second base 27. The second base 27 has an installation port 34. The installation port 34 is used to install the sealing cylinder 35 and connect to the inner cavity of the sealing cylinder 35. The sealing cylinder 35 is used to accommodate and install the bellows 10 and the micro switch 11. An inflation connector 3 is also installed on the second base 27. The inflation connector 3 is connected to the air passage 8 of the first base 1 and the installation port 34 of the second base 2. The inflation connector 3 is used to connect to the insulating air chamber of the electrical equipment.

[0059] The present invention discloses a housing structure for a cylindrical gas density relay. A sealed cavity is formed by an end cap 15 and a sealing cover 14. A first base 1 is provided within the cavity for mounting a Baden tube 6. The inner cavity of a second housing 2 has an mounting port 34 for a second base 27 for mounting a sealing cylinder 35 and connecting to the inner cavity of the sealing cylinder 35. The sealing cylinder 35 is used to accommodate and mount a bellows tube 10 and a microswitch 11. An inflation connector 3 on the second base 27 connects to the air passage 8 of the first base 5 and the mounting port 34 of the second base 27. Thus, the sealed cavity of the first housing 1 can be filled with compensating gas or anti-vibration oil as needed. The sealing cylinder 35 is filled with insulating gas from the electrical equipment's gas chamber via the inflation connector 3. Compensating gas is filled into the inner cavity of the bellows tube 10. The inner cavity of the sealing cylinder 35 serves as a relative cavity, allowing the movement of the bellows tube 10 acting on the microswitch 11 to be compensated. Moreover, since the protective cover 13 is cylindrical and the second housing 2 is a cylindrical cover, with the front end of the second housing 2 coaxially connected to the rear end of the protective cover 13, the housing structure of the density relay is relatively simple, and the overall structure is cylindrical. The external structure of the density relay meets the requirements of the circuit equipment type test for the shape of the density relay, and it can be put into operation on the power grid without re-conducting type tests.

[0060] Please refer to Figure 2 The display device includes a sealing cover 14 and components such as a Baden tube 6, a first base 5, and a pointer mechanism 7 enclosed within its cavity. The Baden tube 6 deforms according to the gas pressure within its cavity and drives the pointer mechanism 7 to display the correct gas density value. Generally, a bimetallic strip for temperature compensation is also connected between the driving end of the Baden tube 6 and the pointer mechanism 7. The contact device includes a second housing 2 and a sealing cylinder 35, a bellows 10, and a micro switch 11 disposed within the second housing 2. The bellows 10 deforms according to the gas density within the cavity of the sealing cylinder 35 and drives the micro switch 11 through the push rod 12 to generate a corresponding electrical signal. Gas in the insulating gas chamber of the electrical equipment enters the cavity of the sealing cylinder 35 through the inflation connector 3. The mounting port 34, the cavity of the sealing cylinder 35, and the air passage 8 on the base are 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 the Baden tube 6. Please refer to [reference needed]. Figure 1 and Figure 2The 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 inner cavity of the sealing cover 14 can be completely sealed, neither connected to the Baden tube 6 nor to the inner cavity of the sealing cylinder 35. Standard atmospheric pressure gas can be introduced into the inner cavity of the sealing cover 14 as needed to ensure that the Baden tube 6 and pointer mechanism 7 remain under standard atmospheric pressure even in high-altitude environments, thus avoiding the impact of high altitude on indicating accuracy. Alternatively, oil can be introduced into the inner cavity of the sealing cover 14 to prevent vibration from affecting the pointer's indication. Please refer to [reference needed]. Figure 2 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. The bellows 10 is pre-filled with compensating gas, and the compensating gas can be selected as needed to compensate for environmental factors such as temperature, so that the contact device can more accurately measure the gas density in the insulating gas chamber of the electrical equipment.

[0061] To ensure a reliable seal between the second housing 2 and the end cap 15, please refer to... Figure 1 and Figure 2 A first sealing gasket 4 is provided between the front edge of the second housing 2 and the rear side of the end cover 15, and the first sealing gasket 4 seals the connection between the front edge of the second housing 2 and the rear side of the end cover 15. After the front edge of the second housing 2 presses the first sealing gasket 4 against the rear side of the end cover 15, the second housing 2 is fixedly connected to the protective cover 13.

[0062] Please refer to Figure 1 and Figure 2 A first base 5 is installed inside the sealing cover 14, and a connection hole 17 is provided on the end cap 15. A connector 18 is provided on the first base 5, and the connector 18 has an air passage 8 that connects to the Baden tube 6. A second base 27 is provided inside the sealing cylinder 35, and a plug tube 20 is provided on the second base 27. The plug tube 20 communicates with the mounting port 34 and the inner cavity of the sealing cylinder 35. A part of the connector 18 is sealed to the connection hole 17, and the other part of the connector 18 is sealed to the plug tube 20. Through this connection method, the inner cavity of the sealing cover 14 is effectively isolated from the inner cavity of the sealing cylinder 35. The insulating gas in the gas chamber of the electrical equipment can be filled into the Baden tube 6 through the inflation connector 3, the plug tube 20 in the second base 27, and the air passage 8 in the first base 5. The air passage 8 directly realizes the air path connection without the need for a metal capillary tube, thereby avoiding the breakage of the metal capillary tube due to vibration during assembly or use.

[0063] The present invention discloses a cylindrical gas density relay housing structure in which the outer diameter of the middle housing 29 and the rear housing 30 are the same. In this way, the gas density relay has an aesthetically pleasing appearance and meets the requirements of type testing for the appearance of density relays. The overall appearance of the density relay is similar to that of existing density relays, so it can be put into operation without separate type testing.

[0064] To facilitate the maintenance of components in density relays, such as Figure 1 and Figure 2 As shown, a sealing cover 19 is detachably connected to the rear end of the rear end housing 30. A second sealing gasket 9 is provided between the sealing cover 19 and the rear end edge of the rear end housing 30, and the second sealing gasket 9 seals the rear end edge of the rear end housing 30 with the sealing cover 19 of the end cover 15. Figure 4 and Figure 5 As shown, the rear end of the rear housing 30 is provided with multiple folded edges 31, and the sealing cover 19 is provided with a slot 32 that cooperates with the folded edges 31. The sealing cover 19 can be fixed on the rear housing 30 by aligning the slot 32 on the sealing cover 19 with the slot 32 on the rear housing 30 and tightening it.

[0065] like Figure 2 As shown, the intermediate housing 29 is used to house the bellows 10 and the micro switch 11, while the rear housing 30 is used to house the intelligent control component 28. The micro switch 11 is electrically connected to the electrical equipment. The intelligent control component 28 may include 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 target platform.

[0066] To facilitate the installation of the bellows 10 in the sealing cylinder 35, a second base 27 is provided in the sealing cylinder 35. The bellows 10 is sealed and fixed on the second base 27, and the inflation connector 3 is also fixed on the second base 27. The gas injected into the inflation connector 3 is injected into the Baden tube 6 through the insertion pipe 20 in the second base 27 and the air passage 8 in the first base 5.

[0067] Corresponding to the cylindrical gas density relay of this utility model, such as Figure 2 and Figure 3 As shown, this utility model also provides a cylindrical gas density relay, including the housing structure of the cylindrical gas density relay described in the above technical solution. An inflation connector 3 is connected to the second base 27, and a cable connector 31 is provided on the outer side of the second housing 2. The cable connector 31 is used for electrical connection to the micro switch 11.

[0068] Based on the technical solution of the above specific embodiments, the cylindrical gas density relay of this utility model has a relatively simple shell structure and low production cost. Its overall structure is cylindrical, and the external structure of the density relay meets the requirements for the shape of density relays in circuit equipment type testing, thus satisfying the type testing requirements and allowing it to be put into operation on the power grid without re-testing. This cylindrical gas density relay of this utility model also possesses the aforementioned beneficial effects, which will not be elaborated upon here.

[0069] In summary, this utility model effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0070] 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 housing structure of a cylindrical gas density relay, comprising a first housing and a second housing; the first housing comprises a sealing cover, an end cover and a protective cover, a sealed cavity is formed between the sealing cover and the end cover, the protective cover is cylindrical, the protective cover is sleeved on the outside of the sealing cover, the front end of the protective cover is provided with an observation window, the sealing cover is made of transparent material, the opening of the rear end of the sealing cover is blocked by the end cover; the inner cavity of the sealing cover is provided with a first base, the first base is used for mounting a barden tube, and the first base is provided with an air channel communicated with the inner cavity of the barden tube; the second housing is a cylindrical cover, the front end of the second housing is coaxially connected to the rear end of the protective cover, the rear end of the second housing is sealed, the inner cavity of the second housing is provided with a second base, the second base is provided with a mounting port, the mounting port is used for mounting a sealing cylinder and communicating the inner cavity of the sealing cylinder, the sealing cylinder is used for accommodating a bellows and a micro switch, and a gas charging connector is further mounted on the second base, the gas charging connector is communicated with the air channel of the first base and the mounting port of the second base, and the gas charging connector is used for communicating an insulation gas chamber of an electrical equipment.

2. The cylindrical gas density relay housing structure according to claim 1, wherein a first sealing gasket is arranged between the edge of the front end of the second housing and the rear side of the end cover, and the first sealing gasket seals and connects the edge of the front end of the second housing and the rear side of the end cover.

3. The cylindrical gas density relay housing structure according to claim 1, wherein a connecting hole is arranged on the end cover, a connecting head is arranged on the first base, the air channel extends to the end of the connecting head, and a part of the connecting head is sealingly connected in the connecting hole; a plug-in pipe is arranged on the second base, the plug-in pipe is communicated with the mounting port of the second base, and another part of the connecting head is sealingly connected in the plug-in pipe.

4. The cylindrical gas density relay housing structure according to claim 3, wherein the second housing comprises a middle housing and a rear end housing arranged coaxially, the rear end of the middle housing and the front end of the rear end housing are provided with folded edges folded towards the center axis of the housing, and the folded edge of the rear end of the middle housing is fixedly connected with the folded edge of the front end of the rear end housing.

5. The cylindrical gas density relay housing structure according to claim 4, wherein the outer diameters of the middle housing and the rear end housing are the same.

6. The cylindrical gas density relay housing structure according to claim 4, wherein a sealing cover is detachably connected to the rear end of the rear end housing, a second sealing gasket is arranged between the sealing cover and the edge of the rear end of the rear end housing, and the second sealing gasket sealingly connects the edge of the rear end of the rear end housing and the sealing cover of the end cover.

7. The cylindrical gas density relay housing structure according to claim 4, wherein the middle housing is used for accommodating the sealing cylinder, and the rear end housing is used for accommodating a smart control assembly.

8. The cylindrical gas density relay housing structure according to claim 7, wherein the bellows is fixed on the second base, and the gas charging connector is also fixed on the second base.

9. A cylindrical gas density relay characterized by, the housing structure of the cylindrical gas density relay of claim 1.

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