A dual pressure gas density relay

Abstract

The embodiment of the present application relates to a kind of double pressure gas density relay, including first sensing module, second sensing module, temperature compensation module, indicating module, action module and signal generator.The technical scheme provided by the present application, by being connected to the indicating module and the action module of two sensing modules respectively, realize display and action double-way pressure measurement, and by adjustable action module, the precision of the gas density monitoring of the gas insulation or arc-extinguishing electrical equipment is improved, the improvement of the electrical performance and contact point precision of gas density relay is ensured, stable long-distance signal transmission can be realized simultaneously, the reliable work of system is more comprehensively guaranteed, can be well applied in various SF6 electrical equipment.

Description

Technical Field

[0001] This invention relates to the field of power equipment monitoring technology, and in particular to a dual-pressure 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. In the electrical equipment of the power industry, the operation and normal functioning of high-voltage electrical equipment cannot be separated from the sulfur hexafluoride gas medium used for arc extinguishing and insulation. Therefore, in sulfur hexafluoride electrical products equipped with sealed sulfur hexafluoride gas chambers, ensuring that the chambers do not leak is a crucial basic requirement. If gas leakage occurs, the reduced gas density will severely affect the electrical performance of the equipment, posing a serious threat to its safe operation.

[0003] 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 remote-controlled SF6 gas density relays to collect and upload data on density, pressure, and temperature, achieving online gas density monitoring. Therefore, selecting a reliable remote-controlled density relay is particularly important. Among the currently used remote-controlled SF6 gas density relays, one type uses magnetically assisted electrical contacts, which suffers from unreliable contact and short service life. Another type, while using microswitches, offers reliable contact and a long service life, but its accuracy remains relatively low. Summary of the Invention

[0004] The purpose of this invention is to provide a dual-pressure gas density relay that enables both display and operation pressure measurement, and improves the accuracy of gas density monitoring in gas-insulated or arc-extinguishing electrical equipment through an adjustable operation module.

[0005] To achieve the above objectives, according to one aspect of the present invention, a dual-pressure gas density relay is provided, comprising a first sensing module, a second sensing module, a temperature compensation module, an indication module, an action module, and a signal generator; wherein,

[0006] The first sensing module and the second sensing module are respectively housed in the housing of the gas density relay. When the gas pressure changes, the first elastic deformation value and the second elastic deformation value are output as related to the change in the density of the detected gas.

[0007] The temperature compensation module is connected to the first sensing module and the second sensing module respectively, and converts the first elastic deformation value and the second elastic deformation value into the first displacement value and the second displacement output value respectively.

[0008] The indicator module is connected to the temperature compensation module, receives the first displacement value output by the temperature compensation module, and indicates the gas density change value corresponding to the first displacement value.

[0009] The action module is connected to the temperature compensation module, receives the second displacement value output by the temperature compensation module, and outputs a switch action signal to the signal generator according to the second displacement value;

[0010] The action module includes an output action adjustment unit, which receives the second displacement value and adjusts the magnitude of the output switch action signal according to the magnitude of the second displacement value.

[0011] Furthermore, the actuation module also includes a control mechanism unit; the control mechanism unit includes a mechanism body, a mechanism shaft, and a crankshaft surface; the mechanism shaft is fixedly connected to the mechanism body and protrudes vertically to the side away from the temperature compensation module;

[0012] The crankshaft surface is one or more, arranged parallel to the shaft of the protruding part of the movement shaft, and each crankshaft surface is perpendicular to the shaft and moves with the movement shaft.

[0013] Furthermore, the main body of the movement is connected to the temperature compensation module to receive the second displacement value and transmit the second displacement value to the crankshaft surface through the movement shaft; one end of the temperature compensation module is connected to the moving end of the second pressure detector through the second end seat, and the other end is connected to the main body of the control movement unit; the main body of the movement transmits the linear arc motion of the second displacement value to the movement shaft through the mechanical crank mechanism, so as to convert it into the rotational motion of the movement shaft, and drive the crankshaft surface to move along the movement shaft as the central axis in an involute trajectory, thereby realizing the increase or decrease of the displacement of the crankshaft surface at a certain point under this motion trajectory.

[0014] Furthermore, the output action adjustment unit is one or more, each corresponding to one or more crankshaft faces, and is fixedly mounted on the base by a mounting bracket.

[0015] The output motion adjustment unit includes a cover, a trigger rod, and a spring.

[0016] Furthermore, the trigger rod and spring are disposed inside the housing and fixed between the crankshaft surface and the signal generator by the housing;

[0017] The trigger rod is assembled and connected to the crankshaft surface, and moves up and down according to the movement of the crankshaft surface to output a switch action signal to the signal generator.

[0018] Furthermore, the spring is configured such that the output motion adjustment unit engages seamlessly with the crankshaft surface.

[0019] Furthermore, the trigger rod includes a trigger drive rod, a trigger adjustment component, and a locking nut;

[0020] The trigger adjustment component is threaded to the upper part of the trigger drive rod and fixed by a locking nut;

[0021] The length of the trigger adjustment element is adjustable to adjust the magnitude of the switch action signal output by the trigger rod.

[0022] Furthermore, the first sensing module includes a first pressure detector, one end of which is sealed and connected to the base of the relay, and the other end is connected to one end of the temperature compensation module through a first end seat.

[0023] The second sensing module includes a second pressure detector, one end of which is sealed and connected to the base of the relay, and the other end is connected to one end of the temperature compensation module through a second end seat.

[0024] Furthermore, the indicating module includes a display mechanism, a pointer, and a dial;

[0025] One end of the display mechanism is connected to a temperature compensation module, and the other end is connected to a pointer and a dial.

[0026] Furthermore, the temperature compensation module includes a temperature compensation element;

[0027] The temperature compensation element includes a bimetallic strip made of bimetallic material, wherein the two metals of the bimetallic strip have different coefficients of thermal expansion.

[0028] In summary, this invention provides a dual-pressure gas density relay, comprising a first sensing module, a second sensing module, a temperature compensation module, an indication module, an action module, and a signal generator. The first and second sensing modules are respectively disposed within the housing of the gas density relay, and output a first elastic deformation value and a second elastic deformation value related to the detected gas density change value when the gas pressure changes. The temperature compensation module is connected to both the first and second sensing modules, converting the first and second elastic deformation values ​​into a first displacement value and a second displacement value, respectively, for output. The indication module is connected to the temperature compensation module, receives the first displacement value output by the temperature compensation module, and indicates the gas density change value corresponding to the first displacement value. The action module is connected to the temperature compensation module, receives the second displacement value output by the temperature compensation module, and outputs a switch action signal to the signal generator according to the second displacement value. The action module includes an output action adjustment unit, which receives the second displacement value and adjusts the magnitude of the output switch action signal according to the magnitude of the second displacement value. The technical solution provided by this invention achieves dual-channel pressure measurement of display and action by setting two sensing modules respectively connected to the indicator module and the action module. Furthermore, the adjustable action module improves the accuracy of gas density monitoring in gas-insulated or arc-extinguishing electrical equipment, ensuring the improvement of the electrical performance and contact accuracy of the gas density relay. At the same time, it can achieve stable long-distance signal transmission, more comprehensively guaranteeing the reliable operation of the system, and can be well applied in various SF6 electrical equipment. Attached Figure Description

[0029] Figure 1 This is a side view of the dual-pressure gas density relay according to an embodiment of the present invention;

[0030] Figure 2 This is a front structural schematic diagram of the dual pressure-measuring gas density relay according to an embodiment of the present invention;

[0031] Figure 3 This is a partial structural diagram of the crankshaft side of the dual-pressure gas density relay according to an embodiment of the present invention;

[0032] Figure 4 This is a schematic diagram of the ventilation state structure of the dual pressure gas density relay according to an embodiment of the present invention;

[0033] Figure 5 This is a schematic diagram of the leakage state structure of the dual pressure measuring gas density relay in an embodiment of the present invention. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0035] It should be noted that, unless otherwise defined, the technical or scientific terms used in one or more embodiments of the present invention should have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "first," "second," and similar terms used in one or more embodiments of the present invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0036] The technical solution of the present invention will now be described in detail with reference to the accompanying drawings. An embodiment of the present invention provides a dual-pressure gas density relay. Figure 1 The diagram shows a side view of the dual-pressure gas density relay according to an embodiment of the present invention. Figure 2 The diagram shows a front view of the dual-pressure gas density relay according to an embodiment of the present invention. Figure 3 The diagram shows a partial structural schematic of the crankshaft side of the dual-pressure gas density relay according to an embodiment of the present invention. Combined with the above... Figures 1-3 As shown, the dual-pressure gas density relay of this embodiment includes a first sensing module, a second sensing module, a temperature compensation module, an indication module, an action module, and a signal generator 126.

[0037] In this embodiment of the invention, two relatively independent gas density detection modules detect the density, each independently responsible for density display and density monitoring action output signal control, achieving high-precision detection of the displayed density value and density control via contact signals. This dual-pressure gas density relay includes a mechanical part 1, whose components are housed within the front housing 101 and can be connected to the device under test via a device connection connector 102. It also includes a front cover 103, a transparent glass 104, and a sealing gasket 105.

[0038] The first sensing module and the second sensing module are respectively disposed within the housing of the gas density relay. When the gas pressure changes, they output a first elastic deformation value and a second elastic deformation value related to the change in the detected gas density. The first sensing module includes, for example, a first pressure detector 111, one end of which is sealed to the relay base 110, and the other end is connected to one end of a temperature compensation module via a first endplate 112. The second sensing module includes a second pressure detector 121, one end of which is sealed to the relay base 110, and the other end is connected to one end of a temperature compensation module via a second endplate 122. The first pressure detector 111 and the second pressure detector 121 can, for example, be Baden tubes. When the gas pressure inside the housing 101 decreases, the Baden tube 103 undergoes a positive displacement; when the gas pressure inside the housing 101 increases, the Baden tube 103 undergoes a reverse displacement, thereby indicating the change in gas density inside the housing.

[0039] The temperature compensation module is connected to the first sensing module and the second sensing module respectively, and converts the first elastic deformation value and the second elastic deformation value into a first displacement value and a second displacement value for output. This temperature compensation module can be a temperature compensation element, such as a first temperature compensation element 113 and a second temperature compensation element 123. The temperature compensation element can be a bimetallic strip made of bimetallic material, where the two metals have different coefficients of thermal expansion. Based on the displacement generated by the first pressure detector 111 and the second pressure detector 121, the temperature compensation element corrects for changes in pressure and temperature, reflecting changes in SF6 gas density. This temperature compensation element, being a bimetallic strip made of bimetallic material, utilizes the difference in the thermal expansion coefficients of the two metals to offset the effect of temperature on the Baden tube displacement. The length of the temperature compensation element can be set according to actual needs to achieve temperature compensation. That is, under the pressure of the measured medium SF6, due to the effect of the temperature compensation element, when the gas density value inside the measured electrical equipment changes, the pressure value also changes accordingly, forcing the end of the Baden tube to produce a corresponding elastic deformation—displacement. The temperature compensation element compensates for this displacement and then transmits the displacement to the core.

[0040] The indicator module is connected to the temperature compensation module, receives the first displacement value output by the temperature compensation module, and indicates the gas density change value corresponding to the first displacement value. The indicator module includes a display mechanism 114, a pointer 115, and a dial 116; one end of the display mechanism 114 is connected to the temperature compensation module, and the other end is connected to the pointer 115 and the dial 116. The pointer 115 is mounted on the display mechanism 114 and positioned in front of the dial 116. Based on the pressure value detected by the first pressure detector 111, and using the temperature compensation element 123 to correct for changes in pressure and temperature, the module reflects changes in SF6 gas density. Under the pressure of the SF6 gas being measured, the pressure changes accordingly when the SF6 gas density changes due to the function of the first temperature compensation element 113. This forces the end of the first pressure detector 111 to undergo corresponding elastic deformation displacement. This displacement is transmitted to the display mechanism 114 via the first temperature compensation element 113, and then to the pointer 115. Consequently, the measured SF6 gas density value is displayed on the dial 116, allowing the gas density relay to show the SF6 gas density value. If there is a leak, the SF6 gas density value decreases, causing the first pressure detector 111 to generate a corresponding reverse displacement. This displacement is transmitted to the display mechanism 114 via the first temperature compensation element 113, and then to the pointer 115. The pointer 115 then moves towards a smaller value, specifically displaying the degree of leakage on the dial 116. By monitoring the SF6 gas density value in SF6 electrical switches and other equipment through mechanical principles, the SF6 gas density value of the electrical equipment is ensured to remain within the allowable range, thus ensuring the safe operation of the electrical equipment.

[0041] The action module is connected to the temperature compensation module, receives the second displacement value output by the temperature compensation module, and outputs a switch action signal to the signal generator 126 according to the second displacement value. The action module includes an output action adjustment unit 125 and a control mechanism unit 124. The output action adjustment unit 125 receives the second displacement value and adjusts the magnitude of the output switch action signal according to the magnitude of the second displacement value. The control mechanism unit 124 includes a mechanism body 1241, a mechanism shaft 1242, and a crankshaft surface 1243. The mechanism body 1241 is connected to a temperature compensation module to receive the second displacement value and transmit the second displacement value to the crankshaft surface 1243 through the mechanism shaft 1242. The mechanism shaft 1242 is fixedly connected to the mechanism body 1241 and protrudes vertically to the side away from the temperature compensation module. There are one or more crankshaft surfaces 1243, which are arranged parallel to the shaft of the protruding part of the mechanism shaft 1242. Each crankshaft surface 1243 is perpendicular to the shaft and rotates with the mechanism shaft 1242 as the central axis, generating a curved displacement with a certain curvature. One end of the temperature compensation module is connected to the moving end of the second pressure detector 121 via the second end seat 122, and the other end is connected to the main body 1241 of the control mechanism unit 124. The main body 1241 transmits the linear arc motion of the second displacement value to the mechanism shaft 1242 through the mechanical crank mechanism, so as to convert it into the rotational motion of the mechanism shaft 1242, and drives the crankshaft surface 1243 to move along the involute trajectory with the mechanism shaft 1242 as the central axis. Under this motion trajectory, the displacement of the crankshaft surface 1243 at the point is increased or decreased to achieve the purpose of transmission displacement. The process is as follows: when the measured pressure increases, the moving end of the second pressure detector 121 is displaced, causing the temperature compensation module to move accordingly. This movement is transmitted to the movement shaft 1242 via the mechanical crank mechanism of the movement body 1241, thus converting it into rotational motion of the movement shaft 1242. This rotation drives the crankshaft surface 1243 to move in an involute contraction direction, reducing the displacement of the crankshaft surface 1243 at the specified point and disengaging the subsequent triggering mechanism. Conversely, when the measured pressure decreases, the crankshaft surface 1243 moves in an involute expansion direction, increasing the displacement of the crankshaft surface 1243 at the specified point and triggering the subsequent triggering mechanism to achieve the corresponding function. The output action adjustment unit 125 is a single independent component, and there may be one or more units, each corresponding to one or more crankshaft surfaces 1243, and it is fixedly mounted on the base 110 via a fixing bracket 1254. The crankshaft surface 1243 is an involute crankshaft surface.The output action adjustment unit 125 includes a housing 1251, a trigger rod 1252, and a spring 1253. The trigger rod 1252 and spring 1253 are disposed inside the housing 1251 and fixed between the crankshaft surface 1243 and the signal generator 126 by the housing 1251. The trigger rod 1252 is fitted and connected to the crankshaft surface 1243, and moves up and down according to the movement of the crankshaft surface 1243 to output a switch action signal to the signal generator 126. The spring 1253 is configured to seamlessly engage the output action adjustment unit 125 with the crankshaft surface 1243. The trigger rod 1252 includes a trigger drive rod 12521, a trigger adjustment element 12522, and a locking nut 12523. The trigger rod 1252 is disposed inside the housing 1251 and can move up and down or extend and retract within a limited range inside the housing. The trigger adjustment component 12522 is threadedly connected to the upper part of the trigger drive rod 12521. The upper end of the trigger drive rod 12521 has an internal threaded hole, which mates with the external thread of the trigger adjustment component. The trigger adjustment component is also fitted with a locking nut 12523 and is fixed by the locking nut 12523. The length of the trigger adjustment component 12522 is adjustable and remains unchanged after adjustment. By setting different initial lengths, the corresponding displacement of the alarm and lockout contact triggers can be determined, thereby adjusting the magnitude of the switch action signal output by the trigger rod 1252. That is, the length of the trigger adjustment component 12522 is adjustable to adjust the initial displacement output by the trigger rod 1252, thereby adjusting the magnitude of the switch action signal to determine the set values ​​of the alarm and lockout contact signals. The trigger adjustment component 12522 and the trigger drive rod 12521 are threaded together and locked by the locking nut 12523, thus forming the trigger rod 1252. The length of the trigger rod 1252 can be adjusted by adjusting the trigger adjustment component 12522, setting the corresponding initial displacement of the trigger, and thus adjusting the alarm and lockout contact density action value. After adjusting the contact action value, the length is kept constant by locking the nut 12523, making the contact action value fixed. The spring 1253 is nested on the trigger drive rod 12521 at the lower part of the trigger adjustment component 12522. The trigger rod 1252 and the spring 1253 are disposed inside the housing 1251 and fixed inside the density relay by the housing 1251, positioned between the involute crankshaft surface 1243 and the signal generator 126. The signal generator 126 can be a micro switch, outputting the contact signal of the density relay.Under the pressure of the SF6 gas being measured, due to the function of the second temperature compensation element 123, the pressure value of the SF6 gas changes accordingly when the density value changes, forcing the end of the second pressure detector 121 to produce a corresponding elastic deformation displacement. With the help of the second temperature compensation element 123, this displacement is transmitted to the control mechanism unit 124. After displacement amplification by the control mechanism unit 124, the control mechanism unit 124 then cooperates with the output action adjustment unit 125 through its crankshaft surface 1243. In this way, the control mechanism 124 drives the involute crankshaft surface 1243, and the involute crankshaft surface 1243 in turn drives the output action adjustment unit 125 to trigger the signal generator 126. Spring 1253 is configured to ensure seamless engagement between the output action adjustment unit 125 and the involute crankshaft surface 1243. Due to the action of spring 1253, there is a seamless engagement between the output action adjustment unit 125 and the involute crankshaft surface 1243, eliminating any gaps and maximizing the control accuracy of the density contact signal. The output action adjustment unit 125 is positioned between the involute crankshaft surface 1243 and the signal generator 126, specifically below the involute crankshaft surface 1243 and above the signal generator 126, i.e., between them. The signal generator 126 can be a microswitch, outputting the contact signal of the density relay. The length of the trigger rod 1252 can be adjusted by adjusting the trigger adjustment element 1252, thereby adjusting the alarm and lockout contact action values. Once the alarm and interlock contact action values ​​are adjusted, the length is kept fixed by locking the nut 12523. This allows for adjustment and determination of the density action values ​​of the alarm and interlock contacts, enabling the density relay to output density signals from the alarm and interlock contacts. For example, in the event of a gas leak, the SF6 gas density decreases, causing the second pressure detector 121 to generate a corresponding reverse displacement. This displacement is transmitted to the control unit core 124 via the second temperature compensation element 123. The control unit core 124 amplifies the reverse displacement and then drives the output action adjustment unit 125 via its involute crankshaft surface 1243, thereby driving the contact signal of the signal generator 126.Because the control mechanism 124 amplifies the reverse displacement, and then drives the output action adjustment unit 125 away through the involute crankshaft surface 1243, thereby disconnecting the contact signal of the signal generator 126, the circular motion amplified by the control mechanism 124 is converted into linear motion. In other words, the output action adjustment unit 125 is in linear motion. The trigger drive rod 12521 of the linear motion output action adjustment unit 125 then drives the contact signal of the signal generator 126. Therefore, the leakage motion trajectory, after amplification, is not decomposed, thus improving the accuracy of the alarm and lockout density signal action values ​​of the density relay. The signal generator 126 can use a microswitch to improve the electrical performance of the density relay signal contacts. The output of the microswitch can be connected to an external junction box 106 to achieve signal connection. The length of the trigger adjustment component 12522 can be adjusted by adjusting the trigger rod 1252. After the length is locked by the locking nut 12523, it remains fixed. This allows the density action value of the alarm and lockout contacts to be adjusted, thereby realizing the density signal output of the alarm and lockout contacts of the density relay. Figure 4 The diagram shows a schematic diagram of the ventilation state structure of the dual pressure gas density relay according to an embodiment of the present invention. Figure 5 The diagram shows a schematic representation of the leakage state structure of a dual-pressure gas density relay according to an embodiment of the present invention. Figure 4 and Figure 5 As shown, when the gas density inside the device under test is normal, the output action adjustment unit 125 is separated from the signal generator 126 and will not trigger the signal generator 126 to output an alarm or lockout signal; when the gas density inside the device under test is abnormal due to leakage or other reasons, the output action adjustment unit 125 drives the contact signal of the signal generator 126, triggering the signal generator 126 to output an alarm or lockout signal.

[0042] According to some embodiments, the gas density relay may further include an electronic component 2, which includes a rear housing 201 and a rear cover 202, and a pressure sensor 3, a power supply 211, an amplifier circuit 212, an A / D converter 213, an MCU 214, a temperature sensor 4, and a data communication interface 215 disposed within the rear housing 201. The pressure sensor 3 is fixed inside the rear housing 201 and is interconnected with a first pressure detector 111 and a second pressure detector 121 in the gas path. The front housing 101 of the mechanical component 1 and the rear housing 201 of the electronic component 2 are independent of each other or separated. The MCU 214 is connected to the temperature sensor 4, the pressure sensor 3, and the communication interface 215, respectively. The measurement in the electronic section 2 mainly consists of pressure sensor 3 and temperature sensor 4. After processing by amplifier circuit 212, the data is converted to digital signal by A / D converter 213 and sent to MCU 214. Utilizing a mathematical model of the relationship between SF6 gas pressure and temperature, a soft measurement method is employed to acquire the pressure value P from pressure sensor 3 and the temperature value T from temperature sensor 4. The MCU 214 then processes the data to obtain the SF6 gas density value. Power supply 211 can be a switching power supply, AC 220V, DC power supply, LDO, programmable power supply, solar power, storage battery, rechargeable battery, or other similar devices. The remote density relay is connected to the substation integrated automation online monitoring system via RS-485 and other data communication methods, transmitting data to the unmanned station's central monitoring station. Real-time monitoring is performed at both the local and remote central monitoring stations within the substation, enabling online monitoring of SF6 gas density in SF6 electrical equipment. Simultaneously, through the technological innovation of this invention, the accuracy of the mechanical part of the remote density relay is improved, matching the accuracy of the remote electronic part. This allows for the integration and comparison of mechanical and electrical components, laying a solid technical foundation for the self-diagnosis of the remote density relay.

[0043] In summary, this invention provides a dual-pressure gas density relay, comprising a first sensing module, a second sensing module, a temperature compensation module, an indication module, an action module, and a signal generator. The first and second sensing modules are respectively disposed within the housing of the gas density relay, and output a first elastic deformation value and a second elastic deformation value related to the detected gas density change value when the gas pressure changes. The temperature compensation module is connected to both the first and second sensing modules, converting the first and second elastic deformation values ​​into a first displacement value and a second displacement value, respectively, for output. The indication module is connected to the temperature compensation module, receives the first displacement value output by the temperature compensation module, and indicates the gas density change value corresponding to the first displacement value. The action module is connected to the temperature compensation module, receives the second displacement value output by the temperature compensation module, and outputs a switch action signal to the signal generator according to the second displacement value. The action module includes an output action adjustment unit, which receives the second displacement value and adjusts the magnitude of the output switch action signal according to the magnitude of the second displacement value. The technical solution provided by this invention achieves dual-channel pressure measurement of display and action by setting two sensing modules respectively connected to the indicator module and the action module. Furthermore, the adjustable action module improves the accuracy of gas density monitoring in gas-insulated or arc-extinguishing electrical equipment, ensuring the improvement of the electrical performance and contact accuracy of the gas density relay. At the same time, it can achieve stable long-distance signal transmission, more comprehensively guaranteeing the reliable operation of the system, and can be well applied in various SF6 electrical equipment.

[0044] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of the invention and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of the invention should be included within the protection scope of the invention. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A dual-pressure gas density relay, characterized in that, It includes a first sensing module, a second sensing module, a temperature compensation module, an indicator module, an action module, and a signal generator (126); wherein, The first sensing module and the second sensing module are respectively housed in the housing of the gas density relay. When the gas pressure changes, the first elastic deformation value and the second elastic deformation value are output as related to the change in the density of the detected gas. The temperature compensation module is connected to the first sensing module and the second sensing module respectively, and converts the first elastic deformation value and the second elastic deformation value into the first displacement value and the second displacement value for output. The indicator module is connected to the temperature compensation module, receives the first displacement value output by the temperature compensation module, and indicates the gas density change value corresponding to the first displacement value. The action module is connected to the temperature compensation module, receives the second displacement value output by the temperature compensation module, and outputs a switch action signal to the signal generator (126) according to the second displacement value. The action module includes an output action adjustment unit (125), which receives the second displacement value and adjusts the magnitude of the output switch action signal according to the magnitude of the second displacement value; the action module also includes a control mechanism unit (124); the control mechanism unit (124) includes a mechanism body (1241), a mechanism shaft (1242), and a crankshaft surface (1243). The movement shaft (1242) is fixedly connected to the movement body (1241) and protrudes vertically to the side away from the temperature compensation module; The crankshaft surface (1243) is one or more, and is arranged parallel to the shaft of the protruding part of the movement shaft (1242). Each crankshaft surface (1243) is perpendicular to the shaft and moves with the movement shaft (1242). The main body of the movement (1241) is connected to the temperature compensation module to receive the second displacement value and transmit the second displacement value to the crankshaft surface (1243) through the movement shaft (1242); one end of the temperature compensation module is connected to the moving end of the second pressure detector (121) through the second end seat (122), and the other end is connected to the main body of the control movement unit (124) (1241); the main body of the movement (1241) transmits the linear arc motion of the second displacement value to the movement shaft (1242) through the mechanical crank mechanism, so as to convert it into the rotational motion of the movement shaft (1242), and drive the crankshaft surface (1243) to move along the movement of the movement shaft (1242) as the central axis in an involute trajectory, thereby realizing the increase or decrease of the displacement of the crankshaft surface (1243) at the point under this motion trajectory.

2. The gas density relay according to claim 1, characterized in that, The output action adjustment unit (125) is one or more, each corresponding to one or more crankshaft surfaces (1243), and is fixedly installed on the base (110) by a fixing bracket (1254); The output motion adjustment unit (125) includes a cover (1251), a trigger rod (1252), and a spring (1253).

3. The gas density relay according to claim 2, characterized in that, The trigger rod (1252) and spring (1253) are disposed inside the cover (1251) and are fixed between the crankshaft surface (1243) and the signal generator (126) by the cover (1251); The trigger rod (1252) is assembled and connected with the crankshaft surface (1243). It moves up and down according to the movement of the crankshaft surface (1243) to output a switch action signal to the signal generator (126).

4. The gas density relay according to claim 3, characterized in that, The spring (1253) is configured to allow the output motion adjustment unit (125) to engage seamlessly with the crankshaft surface (1243).

5. The gas density relay according to claim 4, characterized in that, The trigger rod (1252) includes a trigger drive rod (12521), a trigger adjustment component (12522), and a locking nut (12523). The trigger adjustment component (12522) is threaded to the upper part of the trigger drive rod (12521) and fixed by a locking nut (12523); The length of the trigger adjustment element (12522) is adjustable to adjust the magnitude of the switch action signal output by the trigger rod (1252).

6. The gas density relay according to claim 1, characterized in that, The first sensing module includes a first pressure detector (111), one end of which is sealed and connected to the base (110) of the relay, and the other end is connected to one end of the temperature compensation module through a first end seat (112). The second sensing module includes a second pressure detector (121), one end of which is sealed and connected to the base (110) of the relay, and the other end is connected to one end of the temperature compensation module through a second end seat (122).

7. The gas density relay according to claim 1, characterized in that, The indicator module includes a display mechanism (114), a pointer (115), and a dial (116). One end of the display mechanism (114) is connected to a temperature compensation module, and the other end is connected to a pointer (115) and a dial (116).

8. The gas density relay according to claim 1, characterized in that, The temperature compensation module includes temperature compensation elements (113, 123). The temperature compensation element (113, 123) includes a bimetallic strip made of bimetallic material, wherein the two metals of the bimetallic strip have different coefficients of thermal expansion.

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