Gas density switch and gas density monitoring device

Abstract

The invention discloses a gas density switch and a gas density monitoring device, and relates to the technical field of gas density monitoring, the gas density switch comprises a cylinder and a stroke amplification mechanism; the stroke amplification mechanism comprises a driving assembly, a first acting piece, a second acting piece, a microswitch, an elastic assembly and a transmission piece. The driving assembly can reciprocate in the sealing cavity under the action of the pressure change of the to-be-detected gas so as to drive the first acting piece to move in the direction close to or away from the second acting piece, so that the second acting piece can move from an initial relative position under the interaction with the first acting piece; one end of the transmission part can be in contact with or disconnected from a contact point of the microswitch, so that the microswitch can send out an action signal; and the initial relative position of the second acting piece and the first acting piece can be adjusted. According to the gas density switch and the gas density monitoring device provided by the invention, the anti-vibration performance and the adjustment flexibility can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas density monitoring, and in particular to a gas density switch and a gas density monitoring device. Background Art

[0002] In the power industry, the operation and normal functioning of high-voltage electrical equipment is inseparable from insulating gases such as sulfur hexafluoride (SF6) gas, which are used for arc extinguishing and insulation. Therefore, for insulated electrical products equipped with sealed SF6 gas chambers, ensuring that the chambers are leak-proof is a fundamental requirement. If the gas leaks, the reduced gas density will seriously affect the electrical performance of the equipment and pose a serious risk to its safe operation. Currently, the density of SF6 and other insulating gases is commonly monitored using a mechanical pointer-type SF6 gas density relay. This is done through the gas density switch within the gas density relay.

[0003] The operating environment of high-voltage substations is harsh, especially during system operation, which can generate high vibrations. This can cause damage to components within the gas density relay, such as the gas density switch, or malfunction. This in turn affects the detection accuracy and other functions of the remote SF6 gas density relay, resulting in poor or no remote transmission signal and unreliable operation. Furthermore, existing gas density relays make it difficult to adjust the monitoring accuracy of the gas density switch. Summary of the Invention

[0004] The purpose of the present invention is to provide a gas density switch and a gas density monitoring device to solve the problems existing in the above-mentioned prior art and improve the vibration resistance and adjustment flexibility.

[0005] To achieve the above object, the present invention provides the following solutions: The present invention provides a gas density switch, comprising a cylinder and a stroke amplification mechanism; the cylinder is used to be placed in a shell and encloses a sealed cavity; the stroke amplification mechanism comprises a drive assembly, a first action member, a second action member, a micro switch, an elastic assembly and a transmission member; the first action member is arranged on the drive assembly, and the drive assembly and the first action member are both arranged in the sealed cavity; the second action member, the micro switch, the elastic assembly and the transmission member are all arranged outside the cylinder, the micro switch is relatively fixed to the cylinder, one end of the transmission member is movably connected to the micro switch and can contact or disconnect with the contact of the micro switch, and the other end of the transmission member is connected to the elastic assembly Connected to the cylinder, the second acting member is arranged on the transmission member; the microswitch is used to communicate with the intelligent control unit; the driving component can move back and forth in the sealed cavity under the action of the pressure change of the gas to be measured, so as to drive the first acting member to move in the direction of approaching or away from the second acting member, so that the second acting member can move from the initial relative position under the interaction with the first acting member to drive the transmission member to rotate relative to the microswitch, and then one end of the transmission member can contact or disconnect with the contact of the microswitch, so that the microswitch can send an action signal; and the second acting member can adjust the initial relative position with the first acting member.

[0006] Preferably, the driving assembly includes a bellows and a driving member, the sealed cavity is provided with a guide cylinder, the bellows is arranged in the guide cylinder, one end of the bellows is relatively fixed to the inner wall of the sealed cavity, and the other end is fixedly connected to the driving member, the driving member slides through one side wall of the guide cylinder, and the first acting member is arranged on the driving member; a connecting hole connected to the sealed cavity is provided on the guide cylinder, and the sealed cavity is used to connect the gas to be measured, so that the pressure inside the guide cylinder and the sealed cavity is consistent with the pressure of the gas to be measured; the bellows can move back and forth in the sealed cavity under the action of the change in the pressure of the gas to be measured, so that the first acting member can be driven by the driving member to move in the direction of approaching or away from the second acting member.

[0007] Preferably, the elastic component is capable of adjusting the supporting force on the end of the transmission member facing away from the micro switch.

[0008] Preferably, the first acting member is movable and fixed relative to the driving assembly so as to be able to adjust an initial relative position with the second acting member.

[0009] Preferably, the first acting member is configured as a permanent magnet, and the second acting member is configured as a metal block, and the first acting member and the second acting member can interact with each other through magnetic force.

[0010] The present invention also provides a gas density monitoring device, comprising a shell, a gas density switch as described above, a signal acquisition component and an intelligent control unit; the shell can be connected to an insulating gas chamber; the gas density switch is arranged in the shell; the signal acquisition component is arranged in the shell and can monitor the pressure of the gas to be measured in the insulating gas chamber; the intelligent control unit is arranged in the shell and can communicate with the micro switch of the gas density switch and the signal acquisition component to receive signals; and the intelligent control unit can communicate with external equipment.

[0011] Preferably, it further comprises a pointer display mechanism, which is arranged in the shell and can be connected to the insulating air chamber, and the pointer display mechanism can display the density of the gas to be measured in the insulating air chamber with a pointer.

[0012] Preferably, an inflation connector is provided on the shell, and an air duct is provided in the shell. One end of the inflation connector can be connected to the insulating air chamber, and the other end is connected to the air duct; the gas density switch, the signal acquisition component and the pointer display mechanism are all connected to the air duct.

[0013] Preferably, a first cavity and a second cavity are separated from each other in the shell; the gas density switch, the pointer display mechanism and the air duct are all arranged in the first cavity, the signal acquisition component and the intelligent control unit are arranged in the second cavity, and the signal acquisition component can also collect temperature information in the first cavity and send it to the intelligent control unit.

[0014] Preferably, it also includes a multi-way connector, and the multiple interfaces of the multi-way connector are respectively connected to the inflation connector, the insulating air chamber and the air pressure regulating mechanism; an on-off valve communicatively connected to the intelligent control unit is provided between one interface of the multi-way connector and the insulating air chamber, and the intelligent control unit can control the action of the on-off valve; the intelligent control unit is also communicatively connected to the air pressure regulating mechanism, and the intelligent control unit can perform verification by controlling the action of the air pressure regulating mechanism.

[0015] Compared with the prior art, the present invention has achieved the following technical effects: The gas density switch provided by the present invention has a gas pressure change caused by a change in the density of the gas to be measured. Through the design of a stroke amplification mechanism, the density change of the gas to be measured is amplified, and the first acting member is driven to move by the driving component to interact with the second acting member on the transmission member, so that the second acting member can drive the transmission member to move. The second acting member is connected to the middle of the two ends of the transmission member, and is converted into a stroke amount for pressing or releasing the micro switch contact by utilizing the lever principle, so that the micro switch can have a larger operating stroke for the change of unit air pressure, which is beneficial to improving the setting accuracy of the alarm pressure value or the locking pressure value; the intelligent control unit can receive the contact signal of the micro switch for subsequent signal processing.

[0016] In addition, when external vibration occurs, the elastic component at one end of the transmission part can play a buffering and supporting role, preventing the transmission part from vibrating excessively under the action of external vibration and the gravity of the second acting part, which may cause the micro switch to malfunction. Therefore, the stability and accuracy of the device in a vibration environment are improved, and it has good vibration resistance.

[0017] In addition, by adjusting the initial relative position of the second acting member and the first acting member, the stroke amount of pressing or releasing the micro switch contact can be adjusted, which facilitates the adjustment of the setting accuracy of the alarm pressure value or the locking pressure value; in addition, since the first acting member and the second acting member are respectively arranged on the inside and outside of the cylinder, the second acting member is convenient for adjustment on the outside, and there is no need to disassemble the inside of the cylinder, which is convenient for operation.

[0018] The gas density monitoring device provided by the present invention collects gas pressure information through a signal acquisition component. The intelligent control unit can process the collected signal to obtain gas density information, and monitor the changes in gas density through a gas density switch, which is conducive to improving the setting accuracy of the alarm pressure value or the locking pressure value; the intelligent control unit can also communicate with external equipment, thereby improving the intelligence level of monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 A schematic side view of the structure of a gas density switch provided in the first embodiment of the present invention; Figure 2 A schematic side view of the structure of a gas density monitoring device provided in the second embodiment of the present invention; Figure 3 A schematic side view of the structure of a gas density monitoring device provided in the fourth embodiment of the present invention; Figure 4 A schematic side view of the structure of the gas density monitoring device during self-calibration provided in the fourth embodiment of the present invention; Figure 5 This is a circuit diagram of the gas density monitoring device provided in the fourth embodiment of the present invention when it is not self-calibrating; Figure 6 This is a circuit diagram of the gas density monitoring device during self-calibration provided by the fourth embodiment of the present invention.

[0021] In the figure: 1-housing; 101-first cavity; 102-base; 103-Baden tube; 104-bimetallic temperature compensation element; 105-movement; 106-pointer; 107-dial; 108-sealing cap; 109-spring seat; 110-spring; 111-transmission member; 112-threaded column; 113-metal block; 114-micro switch; 115-crossbar; 116-permanent magnet; 117-cylinder; 118-driving rod; 119-guide cylinder; 120-fixed cover; 121-bellows; 122-bottom plate; 123-airway; 124-support rod; 125-support plate; 126-second cavity; 2-MEMS pressure sensor; 3-MEMS temperature sensor; 4-on-off valve; 5-air pressure regulating mechanism; 6-signal acquisition component; 7-intelligent control unit; 8-inflating connector; 9-multi-way connector; 901-first interface; 902-second interface; 903-third interface; 10-insulating air chamber. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] The purpose of the present invention is to provide a gas density switch and a gas density monitoring device to solve the problems existing in the above-mentioned prior art and improve the vibration resistance and adjustment flexibility.

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Example 1 This embodiment provides a gas density switch, see Figure 1, including a cylinder 117 and a stroke amplification mechanism; the cylinder 117 is used to be placed in the housing 1 and is surrounded by a sealed cavity; the stroke amplification mechanism includes a driving component, a first acting member, a second acting member, a micro switch 114, an elastic component and a transmission member 111; the first acting member is arranged on the driving component, and the driving component and the first acting member are both arranged in the sealed cavity; the second acting member, the micro switch 114, the elastic component and the transmission member 111 are all arranged outside the cylinder 117, the micro switch 114 and the cylinder 117 are relatively fixed, one end of the transmission member 111 is movably connected to the micro switch 114, such as by rotating the pin shaft, and can contact or disconnect with the contact of the micro switch 114, and the other end of the transmission member 111 The second acting member is connected to the cylinder 117 through an elastic component, and is arranged on the transmission member 111; the micro switch 114 is used to communicate with the intelligent control unit 7; the driving component can move back and forth in the sealed cavity under the action of the pressure change of the gas to be measured, so as to drive the first acting member to move in the direction of approaching or away from the second acting member, so that the second acting member can move from the initial relative position under the interaction with the first acting member, so as to drive the transmission member 111 to rotate relative to the micro switch, and then one end of the transmission member 111 can contact or disconnect with the contact of the micro switch 114, so that the micro switch 114 can send an action signal; and the second acting member can adjust the initial relative position with the first acting member.

[0026] The change in density of the gas to be measured causes the change in gas pressure. Through the design of the stroke amplification mechanism, the change in density of the gas to be measured is amplified, and the first acting member is driven to move by the driving component, and interacts with the second acting member on the transmission member 111, so that the second acting member can drive the transmission member 111 to move. The second acting member is connected to the middle of the two ends of the transmission member 111, and is converted into the stroke amount of pressing or releasing the contact of the micro switch 114 by using the lever principle, so that the micro switch 114 can have a larger operating stroke for the change in unit air pressure, which is beneficial to improve the setting accuracy of the alarm pressure value or the locking pressure value; the intelligent control unit 7 can receive the contact signal of the micro switch 114 for subsequent signal processing.

[0027] In addition, when external vibration occurs, the elastic component at one end of the transmission member 111 can play a buffering and supporting role, preventing the transmission member 111 from vibrating excessively at this end under the action of external vibration and the gravity of the second acting member, thereby causing the micro switch 114 to operate incorrectly. This improves the stability and accuracy of the device in a vibration environment and has good anti-vibration performance.

[0028] In addition, by adjusting the initial relative position of the second acting member and the first acting member, the stroke amount of pressing or releasing the contact of the micro switch 114 can be adjusted, which facilitates the adjustment of the setting accuracy of the alarm pressure value or the locking pressure value; in addition, since the first acting member and the second acting member are respectively placed on the inner and outer sides of the cylinder 117, the second acting member is convenient for adjustment on the outside, and there is no need to disassemble and assemble the inside of the cylinder 117, which is convenient for operation.

[0029] In the optional scheme of this embodiment, it is more preferred that the driving assembly includes a bellows 121 and a driving member, the sealed cavity is provided with a guide cylinder 119, the bellows 121 is arranged in the guide cylinder 119, one end of the bellows 121 is relatively fixed to the inner wall of the sealed cavity, and the other end is fixedly connected to the driving member, the driving member slides through one side wall of the guide cylinder 119, and the first acting member is arranged on the driving member; a connecting hole connected to the sealed cavity is provided on the guide cylinder 119, and the sealed cavity is used to connect the gas to be measured, so that the pressure inside the guide cylinder 119 and the sealed cavity is consistent with the pressure of the gas to be measured; the bellows 121 can move back and forth in the sealed cavity under the action of the change in the pressure of the gas to be measured, so that the first acting member can be driven by the driving member to move in the direction of approaching or away from the second acting member.

[0030] Further preferably, the first acting member is configured as a permanent magnet 116 , and the second acting member is configured as a metal block 113 such as an iron block, and the first acting member and the second acting member can interact with each other through magnetic force.

[0031] The driving member includes a driving rod 118 and a cross bar 115. One end of the driving rod 118 is fixedly connected to the bellows 121 through a fixed cover plate 120, such as a bolt, and the other end is fixedly connected, such as a threaded cross bar 115 is passed through. The cross bar 115 is provided with a first action member; by sleeved on the outside of the bellows 121 is a guide cylinder 119, the guide cylinder 119 can prevent the bellows 121 from being tilted and deformed by external vibration, resulting in its own deformation and damage or misoperation of the micro switch 114. , which can improve the vibration resistance; the lower end of the bellows 121 is fixed to the base 102 inside the shell 1 through the bottom plate 122, such as welding or bonding, and the cylinder 117 is connected to the air channel 123 in the base 102. When the gas density increases, the air pressure increases, and the air pressure in the cylinder 117 and the guide cylinder 119 increases, squeezing the bellows 121 from the outside to shorten the bellows 121, thereby driving the driving member to move. When the gas density decreases, the air pressure decreases, and the air pressure in the cylinder 117 and the guide cylinder 119 increases. As the air pressure decreases, the standard gas in the bellows 121 is squeezed internally, causing the bellows 121 to extend, thereby driving the drive member to move; a guide cylinder 119 is sleeved on the outside of the bellows 121, and the lower end of the guide cylinder 119 is fixed, such as by bonding, to the base 102; the permanent magnet 116 is driven by the drive rod 118 to move, attracting the metal block 113 on the transmission member 111. When the relative distance is shortened, the suction force on the metal block 113 increases, causing the metal block 113 to move downward. When the relative distance increases, the suction force on the metal block 113 decreases, causing the metal block 113 to move upward. At the same time, the transmission member 111 structure converts the stroke amount for pressing or releasing the micro switch 114, so that the micro switch 114 can have a larger operating stroke for a unit change in air pressure; since the stroke displacement of the permanent magnet 116 corresponds to the size of the air pressure value, the stroke displacement required to trigger the button of the micro switch 114 is amplified, that is, the unit air pressure value change has a larger displacement.

[0032] In the optional scheme of this embodiment, it is more preferred that the elastic component can adjust the supporting force for the end of the transmission member away from the micro switch; specifically, the elastic component includes a spring 110 and a spring seat 109, and a guide thread column is provided on the cylinder 117 at a position corresponding to the end of the transmission member 111. The end of the transmission member 111 is slidably sleeved outside the guide thread column, and the guide thread column guides the movement of the transmission member 111. The spring seat 109 is threadedly connected to the guide thread column, and the spring is sleeved outside the guide thread column, and the two ends of the spring 110 are fixedly connected to the transmission member 111 and the spring seat 109 respectively. Then, the spring 110 can elastically support the end of the transmission member 111. When external vibration occurs, the spring 110 under the transmission member 111 can prevent the micro switch 114 from malfunctioning due to the influence of the gravity of the metal block 113 and the vibration, thereby improving the stability and accuracy of the device in a vibration environment and having good vibration resistance. Moreover, by adjusting the relative position of the spring seat 109 and the guide thread column, the supporting force of the spring 110 can be adjusted to improve the adaptability and at the same time avoid the supporting force of the spring 110 being too large, which may cause the transmission member 111 to be unable to move with the metal block 113.

[0033] In the optional scheme of this embodiment, it is more preferred that the first acting member can be moved and fixed relative to the driving component so as to be able to adjust the initial relative position with the second acting member; specifically, the first acting member, i.e., the permanent magnet 116, is threadedly assembled on the threaded hole provided in the cross bar 115 of the driving member, and its protruding position relative to the cross bar 115 can be adjusted by rotation, which is convenient for assembly, and can adjust the initial relative position with the metal block 113, and can adjust the stroke amount of pressing or releasing the contact of the micro switch 114, so as to facilitate the adjustment of the setting accuracy of the alarm pressure value or the locking pressure value.

[0034] Further preferably, the second acting member, i.e., the metal block 113, is connected to the transmission member 111 through a threaded column 112, the threaded column 112 is threadedly connected to the transmission member 111, and the metal block 113 is fixedly arranged on the threaded column 112. By adjusting the relative position of the threaded column 112 and the transmission member 111, the relative position of the second acting member and the first acting member is adjusted; or, the second acting member is threadedly connected to the threaded column 112, the threaded column 112 is fixedly connected to the transmission member 111, and by adjusting the relative position of the metal block 113 on the threaded column 112, the relative position of the second acting member and the first acting member is adjusted.

[0035] In the optional scheme of this embodiment, it is more preferred that the number of micro switches 114 can be set to multiple, such as two, and correspondingly, the number of transmission parts 111, elastic components, metal blocks 113 and permanent magnets 116 can be matched and set to multiple, and multiple micro switches 114 can synchronously monitor gas density to improve reliability; specifically, multiple micro switches 114 can be fixedly connected to a support plate 125 by bolts, and the support plate 125 is fixedly connected to the cylinder 117 by a support rod 124, wherein the support rod 124 can be threadedly connected to the support plate 125.

[0036] The gas density switch provided in this embodiment has the following characteristics: in the initial state, when the gas in the insulating gas chamber 10 has not leaked, the micro switch 114 is in a normally closed state under the pressure of the transmission member 111, and the spring 110 provides an upward thrust; when the gas in the insulating gas chamber 10 leaks, the gas density gradually decreases, the external pressure on the bellows 121 gradually decreases, and the standard gas in the bellows 121 is internally squeezed, causing the bellows 121 to stretch, thereby driving the permanent magnet 116 to move upward through the driving rod 118, increasing the suction force on the metal block 113, attracting the metal block 113 on the transmission member 111 to move downward, driving the pressing member 111 to move downward, and the contact signal of the micro switch 114 gradually changes, and a changing signal can be output. Because the contacts of the micro switch 114 are provided with normally closed contacts (composed of the connection terminal COM and the connection terminal NC), the original closed state is changed to an open state and can be sensed by the intelligent control unit 7.

[0037] Example 2 This embodiment provides a gas density monitoring device, namely a gas density relay, see Figure 2 , including a shell 1, a gas density switch as provided in Example 1, a signal acquisition component 6 and an intelligent control unit 7; the shell 1 can be connected to the insulating gas chamber 10; the gas density switch is arranged in the shell 1; the signal acquisition component 6 is arranged in the shell 1 and can monitor the pressure of the gas to be measured in the insulating gas chamber 10; the intelligent control unit 7 is arranged in the shell 1 and can communicate with the micro switch 114 of the gas density switch and the signal acquisition component 6 to receive signals; and the intelligent control unit 7 can communicate with external devices.

[0038] Further preferably, the gas density monitoring device provided in this embodiment also includes a pointer display mechanism, which is arranged in the shell 1 and can be connected to the insulating gas chamber 10. The pointer display mechanism can display the density of the gas to be measured in the insulating gas chamber 10 with a pointer, so as to facilitate intuitive observation of the gas density value.

[0039] Further preferably, an inflation connector 8 is provided on the shell 1, and an air duct 123 is provided in the shell 1, one end of the inflation connector 8 can be connected to the insulating gas chamber 10, and the other end is connected to the air duct 123; the gas density switch, the signal acquisition component 6 and the pointer display mechanism are all connected to the air duct 123; a base 102 is provided in the shell 1, and an air duct 123 is provided in the base 102 and is connected to the inflation connector 8 on the outside of the shell 1 to realize gas communication, and the air duct 123 is connected to the cylinder 117 and the pointer display mechanism to realize the measurement of gas density.

[0040] Specifically, the pointer display mechanism adopts a conventional structure, such as including a pointer 106, a bimetallic temperature compensation element 104, a Baden tube 103, a movement 105, a dial 107, and a sealing cap 108. One end of the Baden tube 103 is connected to the base 102 and communicates with the airway 123, and the other end is sealed by the sealing cap 108. The driving end of the movement 105 is connected to one end of the bimetallic temperature compensation element 104, and the other end of the bimetallic temperature compensation element 104 is connected to the other end of the Baden tube 103. The pointer 106 is mounted on the movement 105 and is located in front of the dial 107. The movement 105, dial 107, and pointer 106 are all disposed within the housing 1. The Baden tube 103 is a device that uses the principle of gas expansion to measure gas pressure. As the density of the gas to be measured changes, the gas pressure in the Baden tube 103 changes and deforms, thereby driving the pointer 106 to achieve a visual display of the gas density.

[0041] Bimetallic temperature compensation element 104 is a temperature-sensitive "U"-shaped element. The opening and closing dimensions of its "U"-shaped end vary with temperature. This characteristic of bimetallic temperature compensation element 104 is used to reversely correct the relationship between the measured gas pressure and temperature, eliminating the effect of temperature on pressure and thereby reflecting changes in gas density. Baden tube 103 is an elastic element. Under the pressure of the measured gas, the end of Baden tube 103 is forced to undergo corresponding elastic deformation and displacement. The reverse correction of bimetallic temperature compensation element 104 transmits this corrected displacement to movement 105, which in turn transmits it to pointer 106, which in turn displays the measured gas density value on dial 107. This density relay eliminates the effect of temperature on pressure, thereby displaying the gas density value.

[0042] Further preferably, a separated first cavity 101 and a second cavity 126 are provided in the shell 1; the gas density switch, the pointer display mechanism and the air duct 123 are all provided in the first cavity 101, and the signal acquisition component 6 and the intelligent control unit 7 are provided in the second cavity 126, and the signal acquisition component 6 can also collect temperature information in the first cavity 101 and send it to the intelligent control unit 7.

[0043] Specifically, the shell 1 has a rectangular structure, which facilitates the sealed connection between the inflation connector 8 and the shell 1; the shell 1 is divided into a first chamber 101 and a second chamber 126 by a partition plate. This design helps to isolate different functional components and improve the stability and safety of the device.

[0044] Specifically, the signal acquisition component 6 includes a MEMS pressure sensor 2, which is communicated with the intelligent control unit 7, and the intelligent control unit 7 is communicated with the host computer to realize remote transmission and monitoring of data; the air pressure collection port of the MEMS pressure sensor 2 is connected to the airway in the base 102, and the MEMS pressure sensor 2 transmits the collected signal to the intelligent control unit 7 for processing.

[0045] In order to correct the influence of ambient temperature, the signal acquisition component 6 also includes a MEMS temperature sensor 3. The MEMS temperature sensor 3 is connected to the partition plate. The air temperature acquisition end of the MEMS temperature sensor 3 is located in the first chamber 101. The MEMS temperature sensor 3 transmits the collected signal to the intelligent control unit 7 for processing; the intelligent control unit 7 monitors the gas pressure and temperature of the shell 1 online according to the signal acquisition component 6, and then obtains the insulating gas density value.

[0046] The intelligent control unit 7 can convert the pressure and temperature values measured by the MEMS pressure sensor 2 and the MEMS temperature sensor 3 into the pressure value P20 corresponding to 20°C according to the gas characteristics, that is, the gas density monitoring device has pressure and temperature measurement and software conversion functions; the intelligent control unit 7 can measure the gas density of relative pressure and absolute pressure types; further, the intelligent control unit 7 can also have a communication interface, which is used to connect to a host computer, a storage device or a printing device, and can complete test data storage, and / or test data export, and / or test data can be printed, and / or data communication with the host computer can be carried out, and / or analog and digital information can be input.

[0047] Furthermore, the gas density monitoring device can also have human-computer interaction functions: it has a data display interface that can refresh the current data value in real time; it has a data input function that can input parameter setting values; the electrical interface of the gas density relay can have a protection function, and misconnection will not cause damage to the interface.

[0048] Further preferably, the gas density monitoring device provided in this embodiment also includes a multi-way connector 9, and multiple interfaces of the multi-way connector 9 are respectively connected to the inflation connector 8, the insulating gas chamber 10 and the air pressure regulating mechanism 5; an on-off valve 4 is provided between one interface of the multi-way connector 9 and the insulating gas chamber 10, and the intelligent control unit 7 is capable of controlling the action of the on-off valve 4; the intelligent control unit 7 is also communicatively connected to the air pressure regulating mechanism 5, and the intelligent control unit 7 is capable of performing calibration by controlling the action of the air pressure regulating mechanism 5.

[0049] Specifically, see Figure 4 The multi-way connector 9 has a first interface 901, a second interface 902, and a third interface 903. The first interface 901 is connected to the gas charging connector 8, and the second interface 902 is connected to the insulating gas chamber 10 of the electrical equipment. An on-off valve 4 is disposed between the second interface 902 and the insulating gas chamber 10 of the electrical equipment. The on-off valve 4 is in communication with the intelligent control unit 7, which controls whether the on-off valve 4 is closed or open. The third interface 903 is connected to the air pressure regulating mechanism 5. The air pressure regulating mechanism 5 is connected to the gas charging connector 8 of the housing 1 via the multi-way connector 9 and is mounted on the insulating gas chamber 10 of the electrical equipment via the on-off valve 4. It is used to adjust the gas pressure in the housing 1, causing the micro switch 114 in the housing 1 to generate a contact signal. The self-calibration function of the density relay is realized through the signal acquisition component 6 and the intelligent control unit 7 disposed in the second chamber 126 of the housing 1.

[0050] The on-off valve 4 is connected to the intelligent control unit 7 and opens or closes under the control of the intelligent control unit 7. The gas pressure regulating mechanism 5 adjusts the gas pressure in the density relay housing 1, causing the density relay housing 1 to generate a contact signal. During normal operation, the on-off valve 4 is open, and the gas density relay monitors the gas density value within the electrical equipment. Simultaneously, the gas density relay monitors the gas density value within the electrical equipment online via the MEMS pressure sensor 2, the MEMS temperature sensor 3, and the intelligent control unit 7. The circuit board of the signal acquisition component 6 can also be connected to the microswitch 114 for communication and acquisition of its contact signals. The microswitch 114 is connected to the intelligent control unit 7 for communication, and the microswitch 114 transmits a switch signal to the intelligent control unit 7. The intelligent control unit 7 can be a microprocessor-based embedded system with embedded algorithms and control programs to automatically control the entire monitoring process, including all peripherals, logic, and inputs and outputs.

[0051] The intelligent control unit 7 can be implemented using a general-purpose computer, an industrial computer, a CPU, a single-chip microcomputer, an ARM chip, an AI chip, a quantum chip, a photonic chip, an MCU, an FPGA, a PLC, an industrial control mainboard, an embedded main control board, etc.

[0052] The air pressure regulating mechanism 5 adopts a conventional structure, for example, including an air chamber and a heating component, the air chamber is connected to the third interface 903 of the multi-way connector 9, and the intelligent control component 7 adjusts the gas pressure value of the air chamber by controlling the heating of the heating component.

[0053] In addition, the gas density monitoring device provided in this embodiment has a self-calibration function. The working principle of the self-calibration is as follows, and reference can be made to the description in the fourth embodiment.

[0054] Further preferably, the gas density monitoring device provided in this embodiment uploads the density value, temperature value T, and / or pressure value P of the gas in the insulating gas chamber 10 through data communication; for example, it is connected to the substation integrated automation online monitoring system through data communication methods such as RS-485, and is remotely transmitted to the unmanned station central monitoring station through the intelligent control unit 7, and real-time monitoring is performed at the local and remote central monitoring stations of the substation, thereby realizing online monitoring of the gas density in electrical equipment.

[0055] Furthermore, the gas density monitoring device provided in this embodiment can achieve long-distance transmission of test data and / or results and other information via data communication. It can also include a clock to record test time and can provide functions such as real-time online display of density, pressure, temperature, and other data, trend analysis, historical data query, and real-time alarms. When online monitoring detects an increasing trend in gas pressure, an abnormality notification can be issued in a timely manner.

[0056] The gas density monitoring device provided in this embodiment may also include a temperature protection function for electronic components, preventing them from operating at excessively low or high temperatures and ensuring that they operate within an acceptable temperature range. The vibration-resistant sulfur hexafluoride gas density monitoring device of the present invention may also be equipped with a heater and / or a heat sink, such as a fan, which is activated at low temperatures and at high temperatures to ensure that electronic components, such as the MEMS pressure sensor 2 and / or integrated circuits, can operate reliably in both low and high temperature environments.

[0057] The gas density monitoring device provided in this embodiment may also have data analysis and data processing functions, and can perform corresponding fault diagnosis and prediction on electrical equipment and the density relay itself thereon.

[0058] Based on the above technical solution, the gas density monitoring device provided in this embodiment is a highly vibration-resistant, high-precision, self-calibrating remote sulfur hexafluoride gas density monitoring device, which can improve monitoring efficiency, achieve maintenance-free, thereby reducing costs and making power grid operation more reliable.

[0059] Example 3 This embodiment provides a gas density switch, which is different from the gas density switch provided in the first embodiment in that: Figure 3 and Figure 4 As can be seen from the figure, the micro switches 114 are arranged in opposite directions, and the two micro switches 114 can be directly fixed to the cylinder 117 by bolts or glue.

[0060] The gas density switch provided in this embodiment has an initial state in which, when the gas in the insulating gas chamber 10 is not leaking, the microswitch 114 is in a normally open state under the pressure of the transmission member 111, and the spring 110 provides an upward thrust. When the gas in the insulating gas chamber 10 leaks, the gas density gradually decreases, and the external pressure on the bellows 121 gradually decreases. The standard gas in the bellows 121 is squeezed internally, causing the bellows 121 to stretch, thereby driving the permanent magnet 116 to move upward through the driving rod 118, increasing the suction force on the metal block 113, attracting the metal block 113 on the transmission member 111 to move downward, driving the pressing member 111 to move downward, and the contact signal of the microswitch 114 gradually changes, and a changing signal can be output. Because the contacts of the microswitch 114 are usually provided with normally open contacts (composed of the connection terminal COM and the connection terminal NO), the original open state is changed to a closed state and can be sensed by the intelligent control unit 7.

[0061] The other structures of the gas density switch provided in this embodiment are the same as those in the first embodiment and will not be described in detail here.

[0062] Example 4 This embodiment provides a gas density monitoring device, namely a gas density relay, which differs from the gas density monitoring device provided in the second embodiment in that the gas density switch provided in the third embodiment is adopted.

[0063] The other structures of the gas density monitoring device provided in this embodiment are the same as those in the second embodiment and will not be described in detail here.

[0064] The gas density monitoring device provided in this embodiment has a self-calibration function, and the working principle of the self-calibration is as follows: The gas density monitoring device performs data analysis based on the set calibration time and / or calibration instructions, the gas density value obtained based on the collected pressure and temperature values, and the corresponding collected contact signal value of the micro switch 114; when the gas density relay is allowed to be calibrated, the signal acquisition component 6 is directly or indirectly adjusted to the calibration state through the intelligent control unit 7. Figure 6 As shown, in the verification state, the signal acquisition component 6 cuts off the control loop of the gas density relay contact signal, that is, the signal acquisition component 6 is controlled by the intelligent control unit 7 to de-energize the intermediate relay J1 control coil of the signal acquisition component 6, that is, the contact J11 and the contact J12 are disconnected, so that the contact signal PJ of the gas density relay is disconnected from the control loop of the contact signal.

[0065] The intelligent control unit 7 controls the on-off valve 4 to close, thereby shutting off the gas path between the gas density relay and the electrical equipment; then, the intelligent control unit 7 controls the pressure change of the gas pressure regulating mechanism 5 to adjust the gas pressure of the gas density relay, causing the gas pressure to slowly decrease, causing the gas density relay to alarm and lock the signal contact to operate, such as Figure 6 As shown, when the contact PJ of the gas density relay is closed, the photoelectric coupler light-emitting electrode is energized and lights up, making Figure 6 The output end of is low level, that is, the intelligent control unit 7 can detect the low level; in this way, the contact action of the gas density relay is transmitted to the intelligent control unit 7 through the signal acquisition component 6. The intelligent control unit 7 obtains the gas density value P20 according to the pressure value P and temperature value T when the alarm and lockout signal contacts are actuated, or directly obtains the gas density value P20, detects the alarm and lockout contact signal action values of the gas density relay, and completes the verification of the contact signal action value of the gas density relay. Next, the gas pressure regulating mechanism 5 is driven by the intelligent control unit 7 to slowly increase the gas pressure, so that the gas density relay alarms and the lockout signal contacts are reset, such as Figure 6 As shown in the figure, when the contact PJ of the gas density relay is disconnected, the photoelectric coupler light-emitting electrode is not energized and does not light up, making Figure 6 The output terminal of is high level, that is, the intelligent control unit 7 can detect the high level. In this way, the alarm and lockout signal contact reset of the gas density relay is transmitted to the intelligent control unit 7 through the signal acquisition component 6. The intelligent control unit 7 obtains the gas density value P20 based on the pressure value P and temperature value T when the contact is reset, or directly obtains the gas density value P20, detects the alarm and lockout contact signal return value of the gas density relay, and completes the verification of the contact signal return value of the gas density relay.

[0066] When all the contact signal verification work is completed, the intelligent control unit 7 controls the on-off valve 4 to open, so that the gas density relay and the gas path of the electrical equipment are connected to each other, and the signal acquisition device 6 is adjusted to the working state. At this time, the intelligent control unit 7 controls the signal acquisition device 6 to energize the control coil of the intermediate relay J1 of the signal acquisition device 6, and its contacts J11 and J12 are closed. In this way, the contact signal of the gas density relay is connected to the control circuit of the contact signal, and the control circuit of the contact signal of the gas density relay resumes normal operation. Figure 5 shown.

[0067] In this first embodiment, the on-off valve 4 of the gas density monitoring device is controlled by the intelligent control unit 7 to open and close, ensuring that the gas density relay is connected to the electrical equipment in the gas path during operation. The gas density relay can safely monitor the gas density of the electrical equipment, ensuring safe and reliable operation of the electrical equipment. In the calibration state, the gas density relay is disconnected from the electrical equipment in the gas path, and online calibration of the gas density relay does not affect the safe operation of the electrical equipment. This embodiment enables online calibration of the gas density relay, improving efficiency and reducing operation and maintenance costs. Furthermore, the entire calibration process achieves zero SF6 gas emissions, complying with environmental regulations and facilitating widespread application.

[0068] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A gas density switch, characterized in that: include: The cylinder is used to be placed in the shell and enclose a sealed cavity; The stroke amplification mechanism includes a drive assembly, a first operating member, a second operating member, a micro switch, an elastic member, and a transmission member; the first operating member is disposed on the drive assembly, and the drive assembly and the first operating member are both disposed within the sealed cavity; the second operating member, the micro switch, the elastic member, and the transmission member are all disposed outside the cylinder; the micro switch is relatively fixed to the cylinder; one end of the transmission member is movably connected to the micro switch and can contact or disconnect with the contact of the micro switch; the other end of the transmission member is connected to the cylinder via the elastic member, and the second operating member is disposed on the transmission member; the micro switch is used to communicate with the intelligent control unit; The driving assembly can move back and forth in the sealed cavity under the action of changes in the pressure of the gas to be measured, so as to drive the first acting member to move in a direction close to or away from the second acting member, so that the second acting member can move from an initial relative position under the interaction with the first acting member, so as to drive the transmission member to rotate relative to the micro switch, and then one end of the transmission member can contact or disconnect with the contact of the micro switch, so that the micro switch can send an action signal; and the second acting member can adjust the initial relative position with the first acting member.

2. The gas density switch according to claim 1, characterized in that: The driving assembly includes a bellows and a driving member. The sealed cavity is provided with a guide cylinder. The bellows is arranged in the guide cylinder. One end of the bellows is fixed relative to the inner wall of the sealed cavity, and the other end is fixedly connected to the driving member. The driving member slides through a side wall of the guide cylinder. The first acting member is arranged on the driving member. The guide cylinder is provided with a connecting hole connected to the sealed cavity, and the sealed cavity is used to connect the gas to be measured so that the pressure inside the guide cylinder and the sealed cavity is consistent with the pressure of the gas to be measured; the bellows can move back and forth in the sealed cavity under the action of the pressure change of the gas to be measured, so as to be able to drive the first acting member to move in the direction of approaching or moving away from the second acting member through the driving member.

3. The gas density switch according to claim 1, characterized in that: The elastic component can adjust the supporting force for the end of the transmission member facing away from the micro switch.

4. The gas density switch according to claim 1, characterized in that: The first acting member is movable and fixed relative to the driving assembly so as to be able to adjust an initial relative position with the second acting member.

5. The gas density switch according to claim 1, characterized in that: The first acting member is configured as a permanent magnet, and the second acting member is configured as a metal block. The first acting member and the second acting member can interact with each other through magnetic force.

6. A gas density monitoring device, characterized in that: include: a housing capable of communicating with the insulating air chamber; The gas density switch according to any one of claims 1 to 5, arranged in the housing; a signal acquisition component, disposed in the housing and capable of monitoring the pressure of the gas to be measured in the insulating gas chamber; and The intelligent control unit is arranged in the shell and can be communicatively connected with the micro switch of the gas density switch and the signal acquisition component to receive signals; and the intelligent control unit can be communicatively connected with external devices.

7. The gas density monitoring device according to claim 6, characterized in that: It also includes a pointer display mechanism, which is arranged in the shell and can be connected to the insulating air chamber. The pointer display mechanism can display the density of the gas to be measured in the insulating air chamber with a pointer.

8. The gas density monitoring device according to claim 7, characterized in that: An inflation connector is provided on the shell, and an air duct is provided inside the shell. One end of the inflation connector can be connected to the insulating air chamber, and the other end is connected to the air duct; the gas density switch, the signal acquisition component and the pointer display mechanism are all connected to the air duct.

9. The gas density monitoring device according to claim 8, characterized in that: A first cavity and a second cavity are separated from each other in the shell; the gas density switch, the pointer display mechanism and the airway are all arranged in the first cavity, and the signal acquisition component and the intelligent control unit are arranged in the second cavity, and the signal acquisition component can also collect temperature information in the first cavity and send it to the intelligent control unit.

10. The gas density monitoring device according to claim 8, characterized in that: It also includes a multi-way connector, and multiple interfaces of the multi-way connector are respectively connected to the inflation connector, the insulating air chamber and the air pressure regulating mechanism; an on-off valve connected to the intelligent control unit for communication is provided between one interface of the multi-way connector and the insulating air chamber, and the intelligent control unit can control the action of the on-off valve; the intelligent control unit is also connected to the air pressure regulating mechanism for communication, and the intelligent control unit can perform verification by controlling the action of the air pressure regulating mechanism.

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