Sulfur hexafluoride gas density relay

Abstract

The invention discloses a sulfur hexafluoride gas density relay, and relates to the technical field of relays. The sulfur hexafluoride gas density relay comprises a mechanical assembly, and a base, a Bourdon tube, an end seat, a U-shaped bimetal temperature compensation plate, an operation arm, a microswitch and an anti-vibration corrugated pipe assembly are arranged in a first shell of the mechanical assembly. The Bourdon tube is hermetically connected with the base and the end seat, the bimetal temperature compensating plate is connected with the end seat and the operating arm, and the operating arm is provided with an adjusting screw for triggering the microswitch. The bottom end of the anti-vibration corrugated pipe assembly is connected with the base, a corrugated pipe closed cavity of the anti-vibration corrugated pipe assembly is communicated with the Bourdon pipe, and a gap is formed between the top end and the bottom face of the operation arm. And the interval width is smaller than the moving distance of the operating arm required when the alarm is triggered. Through the communication design, the Bourdon tube and the anti-vibration corrugated pipe assembly act synchronously, the interval is kept constant, false alarm caused by vibration is effectively restrained, and the density monitoring accuracy and the working stability are improved.

Description

Technical Field

[0001] This invention relates to the field of relay technology, and in particular to a sulfur hexafluoride gas density relay. Background Technology

[0002] Currently, sulfur hexafluoride (SF6) electrical products are widely used in the power sector and industrial and mining enterprises, promoting the rapid development of the power industry. Meanwhile, with the development of unmanned substations towards networking and digitalization, online monitoring of the gas density status of SF6 electrical equipment has become increasingly common. Current gas density monitoring systems (gas density relays) widely employ intelligent SF6 gas density relays to collect and upload data on density, pressure, and temperature, achieving online gas density monitoring. Therefore, selecting a reliable remote-transmission density relay is particularly important.

[0003] However, the currently used intelligent SF6 gas density relay uses a single Baden tube as the pressure sensing element and a bimetallic temperature compensation plate to simultaneously drive the microswitch and display the pointer. The advantage is that the pointer display can be synchronized with the measured gas density and pressure very well. However, it also has certain limitations and shortcomings. The debugging accuracy is not high, and the vibration resistance performance is difficult to meet the requirements of electrical equipment in actual application sites. When the electrical equipment closes the circuit breaker, the strong vibration of the electrical switch equipment can easily cause malfunctions and false alarms.

[0004] In addition, density relays that combine a bellows-type relative cavity drive microswitch as the control structure and a Baden tube as the pointer display structure have excellent vibration resistance in practical applications due to the high vibration resistance of the bellows-type relative cavity. However, since the bellows-type relative cavity structure and the pointer display Baden tube structure are two relatively independent structures, the synchronization is relatively poor, and there is a certain deviation between the pointer indication and the gas density pressure measured by the bellows-type relative cavity control structure. Summary of the Invention

[0005] The purpose of this invention is to provide a sulfur hexafluoride gas density relay to solve the problems existing in the prior art and improve the accuracy and stability of density monitoring.

[0006] To achieve the above objectives, the present invention provides the following solution: This invention provides a sulfur hexafluoride gas density relay, comprising: A mechanical assembly includes a first housing, within which are disposed a base, a Baden tube, an end seat, a bimetallic temperature compensation plate, an operating arm, a micro switch, an indicating assembly, and a vibration-damping bellows assembly. One end of the Baden tube is sealed to the base, and the other end is sealed to the end seat. One end of the bimetallic temperature compensation plate is fixedly connected to the end seat, and the other end is fixedly connected to the operating arm. The micro switch is fixedly connected to the first housing and is located on the side of the operating arm away from the base. An adjusting screw for triggering the micro switch is threaded onto the operating arm. The indicating assembly includes a pointer scale, a pointer display mechanism, and a pointer, one end of which is fixedly connected to the output end of the pointer display mechanism. The base and the operating arm... The arms are respectively connected to the pointer display mechanism, which is used to convert the movement of the operating arm into the rotation of the pointer. The pointer scale is fixed on the base or the pointer display mechanism and located between the pointer and the pointer display mechanism. The first housing is provided with a connecting joint for communicating with the measured sulfur hexafluoride gas chamber. The connecting joint is connected to the Baden tube through the base. The bottom end of the anti-vibration bellows assembly is fixedly connected to the base. The anti-vibration bellows assembly includes a bellows sealed cavity, which is connected to the Baden tube. The top end of the anti-vibration bellows assembly is located directly below the operating arm, and there is a gap between the top end of the anti-vibration bellows assembly and the bottom surface of the operating arm. The bimetallic temperature compensation sheet is U-shaped, with the active layer located on the outer side and the passive layer located on the inner side.

[0007] Preferably, the vibration-damping bellows assembly includes a first base plate, a first bellows, a first top plate, and a bimetallic temperature reversal compensation plate arranged sequentially. The first base plate is fixedly connected to the base, and the first base plate and the first top plate are respectively sealed to the first bellows. The bellows sealed cavity is formed by the first base plate, the first top plate, and the first bellows. A vent pipe is connected to the first base plate, and the bellows sealed cavity communicates with the Baden tube through the vent pipe and the base. The interval is located between the bimetallic temperature reversal compensation plate and the operating arm. The bimetallic temperature reverse compensation sheet is U-shaped, with the active layer located on the inner side and the passive layer on the outer side.

[0008] Preferably, the bimetallic temperature reverse compensation plate is installed in the same direction as or in the opposite direction to the bimetallic temperature compensation plate.

[0009] Preferably, the vibration-damping bellows assembly includes a second base plate, a fixed cylinder, a second bellows, a third bellows, a sealing partition, and an adjusting rod. The second base plate is fixedly connected to the base, and the fixed cylinder is fixedly connected to the second base plate. The second bellows and the third bellows are coaxial and both are located inside the fixed cylinder. The sealing partition is located between the second bellows and the third bellows, and one end of each of the second and third bellows is sealed to the sealing partition. The other end of the second bellows is sealed to the inner wall of the fixed cylinder. The bellows sealed cavity is formed by the second bellows, the sealing partition, and the fixed cylinder. A vent pipe is connected to the second base plate, and the bellows sealed cavity is connected to the Baden pipe through the vent pipe and the base. The other end of the third corrugated pipe is fixedly connected to the inner wall of the fixed cylinder. The fixed cylinder is provided with a through hole communicating with the inside of the third corrugated pipe. The adjusting rod passes through the through hole and is fixedly connected to the sealing partition. The gap is located between the adjusting rod and the operating arm.

[0010] Preferably, it also includes a remote transmission electronic component, which includes a second housing. The second housing contains an integrated temperature and pressure sensor and a remote transmission circuit board. The integrated temperature and pressure sensor is connected to the Baden tube via a gas path. The integrated temperature and pressure sensor is signal-connected to the remote transmission circuit board, which is used for data transmission.

[0011] Preferably, the first housing is provided with a front cover, and the front cover is provided with transparent glass facing the pointer scale; a sealing gasket is sandwiched between the front cover and the first housing.

[0012] Preferably, the second housing is provided with a rear cover, and the second housing is fixedly connected to the first housing or independent of each other.

[0013] Preferably, the micro switch is normally closed, and the anti-vibration bellows assembly is used to prevent the adjusting screw from triggering the micro switch when the sulfur hexafluoride gas density relay is vibrated by external force.

[0014] Preferably, the distance between the bimetallic temperature compensation plate and the top end of the anti-vibration bellows assembly is in the direction of the width of the interval, and the width of the interval is less than the distance that the operating arm needs to move when the adjusting screw stops triggering the micro switch.

[0015] Preferably, the adjusting screw is threaded with an anti-loosening nut, and the distance between the adjusting screw and the micro switch can be adjusted by rotating the adjusting screw.

[0016] The present invention achieves the following technical effects compared to the prior art: In this invention, the Baden tube in the sulfur hexafluoride gas density relay is connected to the bellows sealed cavity, allowing the Baden tube and the anti-vibration bellows assembly to extend or retract synchronously. This ensures that the gap between the anti-vibration bellows assembly and the double operating arms remains constant, thereby enabling the anti-vibration bellows assembly to always perform its anti-vibration function. This prevents the adjusting screw from stopping triggering the microswitch when the sulfur hexafluoride gas density relay vibrates under external force, thus avoiding false alarms caused by the density relay. This improves the accuracy and stability of density monitoring. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the sulfur hexafluoride gas density relay in Embodiment 1 of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of the sulfur hexafluoride gas density relay in Embodiment 1 of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the anti-vibration bellows assembly in Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the structure of the bimetallic temperature compensation plate and the bimetallic temperature reverse compensation plate installed in the same direction in Embodiment 1 of the present invention; Figure 5 This is a schematic diagram of the structure of the bimetallic temperature compensation plate and the bimetallic reverse temperature compensation plate installed in reverse in Embodiment 1 of the present invention; Figure 6 This is a schematic diagram of the structure of the sulfur hexafluoride gas density relay in Embodiment 2 of the present invention; Figure 7 This is a schematic diagram of the anti-vibration bellows assembly in Embodiment 2 of the present invention; In the diagram: 1. Mechanical component; 101. First housing; 102. Connecting joint; 103. Front cover; 104. Transparent glass; 105. Sealing gasket; 106. Pointer dial; 107. Baden tube; 108. End seat; 109. Base; 110. Bimetallic temperature compensation plate; 111. Operating arm; 112. Adjusting screw; 113. Locking nut; 114. Micro switch; 115. Pointer display mechanism; 116. Pointer; 117. Anti-vibration bellows assembly; 11 71. First base plate; 1172. First corrugated pipe; 1173. First top plate; 1174. Bimetallic temperature reverse compensation plate; 1175. Vent pipe; 1176. Second base plate; 1177. Fixing cylinder; 1178. Second corrugated pipe; 1179. Third corrugated pipe; 1180. Sealing partition; 1181. Adjusting top rod; 2. Remote transmission electronic components; 201. Second housing; 202. Rear cover; 203. Integrated temperature and pressure sensor; 204. Remote transmission circuit board. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] The purpose of this invention is to provide a sulfur hexafluoride gas density relay to solve the problems existing in the prior art and improve the accuracy and stability of density monitoring.

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Example 1 like Figures 1 to 5 As shown, this embodiment provides a sulfur hexafluoride gas density relay, including a mechanical component 1 and a remote transmission electronic component 2.

[0023] The mechanical component 1 includes a first housing 101, within which are disposed a base 109, a Baden tube 107, an end seat 108, a bimetallic temperature compensation plate 110, an operating arm 111, a micro switch 114, an indicating component, and an anti-vibration bellows assembly 117. One end of the Baden tube 107 is sealed to the base 109, and the other end is sealed to the end seat 108. One end of the bimetallic temperature compensation plate 110 is fixedly connected to the end seat 108, and the other end is fixedly connected to the operating arm 111. The micro switch 114 is fixedly connected to the first housing 101 and is located on the side of the operating arm 111 away from the base 109. An adjusting screw 112 for triggering the micro switch 114 is threaded onto the operating arm 111. The indicating component includes a pointer dial 106, a pointer display mechanism 115, and a pointer 116, one end of which is fixedly connected to the output end of the pointer display mechanism 115. The base 109 and the operating arm 111 are respectively connected to the pointer display... The mechanism 115 is connected, and the pointer display mechanism 115 is used to convert the movement of the operating arm 111 into the rotation of the pointer 116. The pointer scale 106 is fixed on the base 109 or the pointer display mechanism 115 and is located between the pointer 116 and the pointer display mechanism 115. The first housing 101 is provided with a connecting joint 102 for communicating with the sulfur hexafluoride gas chamber being tested. The connecting joint 102 is connected to the Baden tube 107 through the base 109. The vibration-resistant bellows assembly 11 The bottom end of 7 is fixedly connected to the base 109. The anti-vibration bellows assembly 117 includes a bellows sealed cavity, which is connected to the Baden tube 107. The top end of the anti-vibration bellows assembly 117 is located directly below the operating arm 111, and there is a gap between the top end of the anti-vibration bellows assembly 117 and the bottom end of the operating arm 111. The bimetallic temperature compensation plate 110 is U-shaped, with the active layer on the outside and the passive layer on the inside of the bimetallic temperature compensation plate 110.

[0024] The specific working principle of the sulfur hexafluoride gas density relay in this embodiment is as follows: When the gas density in the measured sulfur hexafluoride gas chamber rises or falls, the end of the Baden tube 107 deforms and displaces, and the anti-vibration bellows assembly 117 also deforms and displaces in the same direction. This ensures that the width of the gap between the top of the anti-vibration bellows assembly 117 and the operating arm 111 (assuming the gap width is ΔS) remains constant. The distance that the operating arm 111 needs to move when the adjusting screw 112 stops triggering the micro switch 114 is often corresponding to the distance that the operating arm 111 will move when the minimum pressure setting value of the sulfur hexafluoride gas density is set by the electrical equipment. That is, the deformation of the end of the Baden tube 107 caused by the minimum pressure setting value of the measured sulfur hexafluoride gas density will also cause the operating arm 111 to drive the adjusting screw 112 to move, so that the adjusting screw 112 stops triggering the micro switch 114.

[0025] When the electrical equipment closes the circuit breaker, it generates a strong vibration. At this time, the end of the Baden tube 107 will be displaced due to the vibration, causing the base 109, bimetallic temperature compensation plate 110 and operating arm 111 to vibrate. When the vibration displacement exceeds the distance that the operating arm 111 needs to move when the adjusting screw 112 stops triggering the micro switch 114, the adjusting screw 112 will stop triggering the micro switch 114, causing a false alarm (the micro switch 114 is in a normally closed state, and will not trigger an alarm when the micro switch 114 is triggered, but will trigger an alarm when the micro switch 114 is not triggered). That is, under normal operating conditions, the measured sulfur hexafluoride gas density pressure value that causes the operating arm 111 to move to contact the top of the anti-vibration bellows assembly 117 is greater than the measured sulfur hexafluoride gas density pressure value that causes the operating arm 111 to move to the position where the adjusting screw 112 on the operating arm 111 stops triggering the micro switch 114.

[0026] In this embodiment, the vibration-damping bellows assembly 117 includes a first base plate 1171, a first bellows 1172, a first top plate 1173, and a bimetallic temperature reverse compensation plate 1174 arranged sequentially. The first base plate 1171 is fixedly connected to the base 109. The first base plate 1171 and the first top plate 1173 are respectively sealed to the first bellows 1172. The bellows sealed cavity is formed by the first base plate 1171, the first top plate 1173, and the first bellows 1172. A vent pipe 1175 is connected to the first base plate 1171. The bellows sealed cavity is connected to the Baden tube 107 through the vent pipe 1175 and the base 109. The spacer is located between the bimetallic temperature reverse compensation plate 1174 and the operating arm 111. The bimetallic temperature reverse compensation plate 1174 is U-shaped, with the active layer located on the inner side and the passive layer on the outer side. The bimetallic temperature compensation plate 110 and the bimetallic temperature reverse compensation plate 1174 are designed to have the same shape and effective length. That is, when the temperature increases by the same amount, the elongation change of the bimetallic temperature compensation plate 110 is the same as the shrinkage change of the bimetallic temperature reverse compensation plate 1174, or when the temperature decreases by the same amount, the shrinkage change of the bimetallic temperature compensation plate 110 is the same as the elongation change of the bimetallic temperature reverse compensation plate 1174, so as to eliminate the influence of the deformation of the bimetallic temperature compensation plate 110 on the device during temperature changes.

[0027] In the optional schemes of this embodiment, it is more preferred that the bimetallic temperature reverse compensation plate 1174 and the bimetallic temperature compensation plate 110 are installed in the same direction or in opposite directions; keeping the bimetallic temperature reverse compensation plate 1174 and the bimetallic temperature compensation plate 110 installed in the same direction can compensate for the influence of temperature factors on the vibration-resistant structure.

[0028] In the optional solutions of this embodiment, a more preferred option is to further include a remote transmission electronic component 2. The remote transmission electronic component 2 includes a second housing 201. The second housing 201 is provided with an integrated temperature and pressure sensor 203 and a remote transmission circuit board 204. The integrated temperature and pressure sensor 203 is connected to the Baden tube 107 through an air passage. The integrated temperature and pressure sensor 203 is signal connected to the remote transmission circuit board 204, which is used for data transmission.

[0029] In the optional embodiments of this example, a front cover 103 is provided on the first housing 101, and a transparent glass 104 facing the pointer dial 106 is provided on the front cover 103; a sealing gasket 105 is sandwiched between the front cover 103 and the first housing 101.

[0030] In the optional solutions of this embodiment, it is more preferred that the second housing 201 is provided with a rear cover 202, and the second housing 201 is fixedly connected to the first housing 101 or independent of each other.

[0031] In the optional embodiments of this example, the micro switch 114 is normally closed, and the anti-vibration bellows assembly 117 is used to prevent the adjusting screw 112 from triggering the micro switch 114 when the sulfur hexafluoride gas density relay is vibrated by external force.

[0032] In the optional solutions of this embodiment, it is more preferred that the distance between the operating arm 111 and the top end of the anti-vibration bellows assembly 117 is in the direction of the width of the interval, and the width of the interval is less than the distance that the operating arm 111 needs to move when the adjusting screw 112 stops triggering the micro switch 114.

[0033] In the optional embodiments of this example, a more preferred option is that the adjusting screw 112 is threaded with an anti-loosening nut 113, and the distance between the adjusting screw 112 and the micro switch 114 can be adjusted by rotating the adjusting screw 112.

[0034] Example 2 like Figure 6 and Figure 7 As shown, this embodiment provides a sulfur hexafluoride gas density relay. The sulfur hexafluoride gas density relay of this embodiment is basically the same as the sulfur hexafluoride gas density relay of Embodiment 1 in terms of structure and working principle, with the only difference being: The specific structure of the anti-vibration bellows assembly 117 in this embodiment differs from that in the first embodiment. In this embodiment, the anti-vibration bellows assembly 117 includes a second base plate 1176, a fixed cylinder 1177, a second bellows 1178, a third bellows 1179, a sealing partition 1180, and an adjusting rod 1181. The second base plate 1176 is fixedly connected to the base 109, and the fixed cylinder 1177 is fixedly connected to the second base plate 1176. The second bellows 1178 and the third bellows 1179 are coaxial and both located inside the fixed cylinder 1177. The sealing partition 1180 is located between the second bellows 1178 and the third bellows 1179, and the second bellows 1178 and the third bellows 1179 are... One end of the third bellows 1178 is sealed to the sealing partition 1180, and the other end of the second bellows 1178 is sealed to the inner wall of the fixed cylinder 1177. The bellows sealed cavity is formed by the second bellows 1178, the sealing partition 1180 and the fixed cylinder 1177. A vent pipe 1175 is connected to the second base plate 1176. The bellows sealed cavity is connected to the Baden pipe 107 through the vent pipe 1175 and the base 109. The other end of the third bellows 1179 is fixedly connected to the inner wall of the fixed cylinder 1177. The fixed cylinder 1177 is provided with a through hole that communicates with the inside of the third bellows 1179. The adjusting rod 1181 passes through the through hole and is fixedly connected to the sealing partition 1180. The gap is located between the adjusting rod 1181 and the operating arm 111.

[0035] The working principle of the anti-vibration bellows assembly 117 in this embodiment is as follows: When the gas density in the measured sulfur hexafluoride gas chamber rises or falls, the end of the Baden tube 107 deforms and shifts. Since the bellows-sealed cavity in the anti-vibration bellows assembly 117 is connected to the Baden tube 107, the gas density in the bellows-sealed cavity will also rise or fall accordingly. This causes the second bellows 1178 and the third bellows 1179 to extend and contract respectively, and the sealing partition 1180 will rise and fall accordingly, driving the adjusting rod 1181 to rise and fall, thereby realizing the overall extension or contraction of the anti-vibration bellows assembly 117.

[0036] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A sulfur hexafluoride gas density relay, characterized in that, include: A mechanical assembly includes a first housing, within which are disposed a base, a Baden tube, an end seat, a bimetallic temperature compensation plate, an operating arm, a micro switch, an indicating assembly, and a vibration-damping bellows assembly. One end of the Baden tube is sealed to the base, and the other end is sealed to the end seat. One end of the bimetallic temperature compensation plate is fixedly connected to the end seat, and the other end is fixedly connected to the operating arm. The micro switch is fixedly connected to the first housing and is located on the side of the operating arm away from the base. An adjusting screw for triggering the micro switch is threaded onto the operating arm. The indicating assembly includes a pointer scale, a pointer display mechanism, and a pointer, one end of which is fixedly connected to the output end of the pointer display mechanism. The base and the operating arm... The arms are respectively connected to the pointer display mechanism, which is used to convert the movement of the operating arm into the rotation of the pointer. The pointer scale is fixed on the base or the pointer display mechanism and located between the pointer and the pointer display mechanism. The first housing is provided with a connecting joint for communicating with the measured sulfur hexafluoride gas chamber. The connecting joint is connected to the Baden tube through the base. The bottom end of the anti-vibration bellows assembly is fixedly connected to the base. The anti-vibration bellows assembly includes a bellows sealed cavity, which is connected to the Baden tube. The top end of the anti-vibration bellows assembly is located directly below the operating arm, and there is a gap between the top end of the anti-vibration bellows assembly and the bottom surface of the operating arm. The bimetallic temperature compensation sheet is U-shaped, with the active layer located on the outer side and the passive layer located on the inner side.

2. The sulfur hexafluoride gas density relay according to claim 1, characterized in that: The vibration-damping bellows assembly includes a first base plate, a first bellows, a first top plate, and a bimetallic temperature reverse compensation plate arranged sequentially. The first base plate is fixedly connected to the base, and the first base plate and the first top plate are respectively sealed to the first bellows. The bellows sealed cavity is formed by the first base plate, the first top plate, and the first bellows. A vent pipe is connected to the first base plate, and the bellows sealed cavity is connected to the Baden tube through the vent pipe and the base. The gap is located between the bimetallic temperature reverse compensation plate and the operating arm. The bimetallic temperature reverse compensation sheet is U-shaped, with the active layer located on the inner side and the passive layer on the outer side.

3. The sulfur hexafluoride gas density relay according to claim 2, characterized in that: The bimetallic temperature reverse compensation plate is installed in the same direction as or in the opposite direction to the bimetallic temperature compensation plate.

4. The sulfur hexafluoride gas density relay according to claim 1, characterized in that: The vibration-damping bellows assembly includes a second base plate, a fixed cylinder, a second bellows, a third bellows, a sealing partition, and an adjusting rod. The second base plate is fixedly connected to the base, and the fixed cylinder is fixedly connected to the second base plate. The second bellows and the third bellows are coaxial and both are located inside the fixed cylinder. The sealing partition is located between the second bellows and the third bellows, and one end of each of the second and third bellows is sealed to the sealing partition. The other end of the second bellows is sealed to the inner wall of the fixed cylinder. The bellows sealed cavity is formed by the second bellows, the sealing partition, and the fixed cylinder. A vent pipe is connected to the second base plate, and the bellows sealed cavity is connected to the Baden pipe through the vent pipe and the base. The other end of the third corrugated pipe is fixedly connected to the inner wall of the fixed cylinder. The fixed cylinder is provided with a through hole communicating with the inside of the third corrugated pipe. The adjusting rod passes through the through hole and is fixedly connected to the sealing partition. The gap is located between the adjusting rod and the operating arm.

5. The sulfur hexafluoride gas density relay according to any one of claims 1-4, characterized in that: It also includes a remote transmission electronic component, which includes a second housing. The second housing contains an integrated temperature and pressure sensor and a remote transmission circuit board. The integrated temperature and pressure sensor is connected to the Baden tube via a gas path. The integrated temperature and pressure sensor is signal-connected to the remote transmission circuit board, which is used for data transmission.

6. The sulfur hexafluoride gas density relay according to claim 1, characterized in that: The first housing is provided with a front cover, and the front cover is provided with transparent glass facing the pointer scale; a sealing gasket is sandwiched between the front cover and the first housing.

7. The sulfur hexafluoride gas density relay according to claim 5, characterized in that: The second housing is provided with a rear cover, and the second housing is fixedly connected to the first housing or independent of each other.

8. The sulfur hexafluoride gas density relay according to claim 1, characterized in that: The micro switch is normally closed, and the anti-vibration bellows assembly is used to prevent the adjusting screw from triggering the micro switch when the sulfur hexafluoride gas density relay is vibrated by external force.

9. The sulfur hexafluoride gas density relay according to claim 8, characterized in that: The distance between the operating arm and the top of the anti-vibration bellows assembly is in the direction of the width of the interval, and the width of the interval is less than the distance the operating arm needs to move when the adjusting screw stops triggering the micro switch.

10. The sulfur hexafluoride gas density relay according to claim 1, characterized in that: The adjusting screw is threaded with an anti-loosening nut. By rotating the adjusting screw, the distance between the adjusting screw and the micro switch can be adjusted.

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