CN109103050B - Method for improving precision of gas density relay - Google Patents
Method for improving precision of gas density relay Download PDFInfo
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- CN109103050B CN109103050B CN201811136606.2A CN201811136606A CN109103050B CN 109103050 B CN109103050 B CN 109103050B CN 201811136606 A CN201811136606 A CN 201811136606A CN 109103050 B CN109103050 B CN 109103050B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H35/00—Switches operated by change of a physical condition
- H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
- H01H35/26—Details
- H01H35/28—Compensation for variation of ambient pressure or temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H35/00—Switches operated by change of a physical condition
- H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
- H01H35/36—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by curled flexible tube, e.g. Bourdon tube
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- Fluid Mechanics (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
A method for improving the accuracy of gas density relay is disclosed, the gas density relay includes shell, base, end seat, Bourdon tube, temp compensating element and signal regulatorA section mechanism and a plurality of micro switches used as signal generators; the microswitch is a button type microswitch, the density relay also comprises a microswitch contact point trigger element made of elastic materials, one end of the microswitch contact point trigger element is fixed in the shell, and the other end of the microswitch contact point trigger element is arranged corresponding to the button of the button type microswitch and is abutted against the button of each microswitch; when the gas density value changes, the Bourdon tube and the temperature compensation element generate displacement, the displacement drives the micro-switch contact triggering element through the signal adjusting mechanism in sequence, and the micro-switch contact triggering element changes in position to enable the micro-switch to send out a corresponding signal. The density relay has the advantages of high precision and good contact conductivity, and can be well applied to SF6On the electrical equipment.
Description
Technical Field
The invention relates to a gas density relay, in particular to a method for improving the precision of the gas density relay.
Background
SF6And mixed gas thereof or other environment-friendly gas electrical products are widely applied to the power sector and industrial and mining enterprises, and promote the rapid development of the power industry. And SF6The arc-extinguishing medium and the insulating medium of the electrical product are SF6Gas, no leakage can occur. If air leakage occurs, SF cannot be guaranteed6The electric product can operate reliably and safely. So that SF is monitored6SF of electrical products6Density values are very necessary.
At present, a mechanical pointer SF is generally adopted6Gas density relay to monitor SF6Density, i.e. when SF6The relay can give an alarm and be locked when the electric product leaks air, and can display the field density value. The contact of the density relay generally adopts a hairspring type magnetic-assisted electric contact, although the magnetic-assisted attraction is increased. However, the magnetic-assisted electric contact density relay generally adopts a hairspring type electric contact, and when the density is higher than a set value, the movable contact moves along with the pointer, so the force of the hairspring cannot be large, otherwise, the displayed value is not correct. In addition, the magnetic-assisted attraction force cannot be adjusted too large, otherwise the return value of the density relay is large and exceeds the technical standard. Therefore, for the magnetic-assisted electric contact, the contact closing force is small, the time is long, and if the contact is oxidized, the contact is not opened or the contact is not reliable. In the case of the oil-free type, the magnetic assistant type electric contact is exposed in the air, is very easy to oxidize or accumulate dust, and the contact is easy to be in poor contact or not communicated. It is particularly emphasized that, in coastal areasIn regions, due to the fact that air is humid and contains salt fog, contact points are prone to poor contact or obstruction. Although the oil-filled type and magnetic-assisted type electric contact is soaked in silicone oil, the contact performance is reduced after a long time and a plurality of actions, and the contact is poor or not communicated due to the insulating effect of an oil film. Tests have shown that contact-unreliable phenomena occur, especially at low temperatures. In addition, the density relay has oil leakage defect, and for the density relay with oil leakage, the magnetic assistant type electric contact is exposed in the air and is very easy to oxidize or even accumulate dust, and the contact is easy to be in poor contact or not to be communicated.
The current market also develops an SF with a microswitch used as a contact point6Gas density relay, SF6The microswitch adopted by the gas density relay is provided with a swing rod (or an operation arm is arranged on the microswitch), the structure of the microswitch is shown in figure 1, and as the swing rod 902 is provided with the shaft 903, the shaft 903 is arranged on the microswitch 9. In order to make the swing link 902 rotate flexibly, the shaft 903 is arranged with a clearance on the microswitch 9, and the swing link 902 also swings. The accuracy of such a density relay is not very stable because the displacement of the bourdon tube is also small, there is a gap, and a wobble is generated. Because the position of the swing rod changes due to the clearance and the swing of the swing rod, the precision of the microswitch type density relay is deviated, the microswitch type density relay is not stable, and the high precision of the density relay is difficult to realize. SF mentioned above6Although the microswitch adopted by the gas density relay has certain advantages, the microswitch is unreasonable in structure, so that the following problems still exist in use:
1) when the gas density relay vibrates, the swing rod has a gap, and the position of the swing rod is slightly changed, so that the precision of the gas density relay is seriously influenced. 2) Meanwhile, during debugging, the precision is difficult to be adjusted accurately, namely, a high-precision density relay is difficult to be manufactured.
In view of the above, it is necessary to develop a method for improving the accuracy of a gas density relay by studying to form a high-accuracy and high-electrical-performance gas density relay so as to ensure SF6And the gas electrical equipment can work reliably.
Disclosure of Invention
In order to solve the above problems in the prior art, the present invention provides a method for improving the accuracy of a gas density relay, which is a high-accuracy gas density relay with good electrical performance for controlling and monitoring SF in a sealed container6Equal density of gas and for SF6And when the gas leakage condition occurs in the gas electrical equipment, an alarm signal and a locking signal are sent out in time, so that the electric power safety is guaranteed.
A method of improving the accuracy of a gas density relay, the gas density relay comprising: the device comprises a shell, a base, an end seat, a Bourdon tube, a temperature compensation element, a signal adjusting mechanism and a plurality of micro switches serving as signal generators, wherein the base, the end seat, the Bourdon tube, the temperature compensation element, the signal adjusting mechanism and the micro switches are arranged in the shell; one end of the Bourdon tube is connected to the base in a sealing mode, the other end of the Bourdon tube is connected to the end seat in a sealing mode, one end of the temperature compensation element is connected to the end seat, and the other end of the temperature compensation element is connected with the signal adjusting mechanism; the method comprises the steps that the microswitch is a button type microswitch; the microswitch contact triggering element is made of elastic materials, one end of the microswitch contact triggering element is fixed in the shell, and the other end of the microswitch contact triggering element is arranged corresponding to the buttons of the button type microswitch and is abutted against the buttons of each microswitch in a one-to-one correspondence manner; when the gas density value changes, the Bourdon tube and the temperature compensation element generate displacement, the displacement drives the microswitch contact point trigger element sequentially through the signal adjusting mechanism, and when the gas density value reaches a corresponding set value, the microswitch contact point trigger element presses or is far away from a button of the microswitch, so that the microswitch generates a corresponding signal, and the function of a gas density relay is completed;
when the gas density value returns to normal, the Bourdon tube and the temperature compensation element generate corresponding displacement, the displacement drives the micro-switch contact point trigger element through the signal adjusting mechanism in sequence, and the micro-switch contact point trigger element is reset to the state when the gas density is normal.
When the gas density of the electrical equipment is reduced, the Bourdon tube and the temperature compensation element of the gas density relay generate displacement, the signal adjusting mechanism generates displacement, the contact point trigger element of the microswitch generates displacement, and the microswitch sends a corresponding signal to a certain degree.
The microswitch contact triggering element made of elastic material is used for sending out corresponding alarm or locking signal by means of the elasticity of the microswitch contact triggering element or the thrust of the signal regulating mechanism, and the microswitch contact triggering element made of elastic material is fixed together with the microswitch correspondingly without gap and swinging.
Still including showing core, calibrated scale and pointer, the one end of temperature compensation component through show the connecting rod with show the core and connect or the one end of temperature compensation component is direct to be connected with the display core, the pointer install in on the display core and locate before the calibrated scale.
A method for improving the accuracy of a gas density relay comprises a relatively independent signal control part and a value display part; the signal control part comprises a control base, a control end seat, a control Bourdon tube, a control temperature compensation element, a signal adjusting mechanism and a plurality of micro switches serving as signal generators; one end of the control Bourdon tube is hermetically connected to the control base, the other end of the control Bourdon tube is hermetically connected to the control end seat, one end of the control temperature compensation element is connected to the control end seat, and the other end of the control temperature compensation element is connected with the signal adjusting mechanism; the indicating value display part comprises a display Bourdon tube, a display temperature compensation element, a display base, a display end seat, a display core, a dial and a pointer, one end of the display Bourdon tube is hermetically connected to the display base, the other end of the display Bourdon tube is hermetically connected to the display end seat, one end of the display temperature compensation element is connected to the display end seat, the other end of the display temperature compensation element is connected with the display core through a display connecting rod or the other end of the temperature compensation element is directly connected with the display core, and the pointer is installed on the display core and arranged in front of the dial;
the method is characterized in that the microswitch adopts a button type microswitch;
the microswitch contact triggering element is made of elastic materials, one end of the microswitch contact triggering element is fixed in the shell, and the other end of the microswitch contact triggering element is arranged corresponding to the buttons of the button type microswitch and is abutted against the buttons of each microswitch in a one-to-one correspondence manner;
when the gas density value changes, the Bourdon tube and the temperature compensation element generate displacement, the displacement drives the microswitch contact point trigger element sequentially through the signal adjusting mechanism, and when the gas density value reaches a corresponding set value, the microswitch contact point trigger element presses or is far away from a button of the microswitch, so that the microswitch generates a corresponding signal, and the function of a gas density relay is completed;
when the gas density value returns to normal, the Bourdon tube and the temperature compensation element generate corresponding displacement, the displacement drives the micro-switch contact point trigger element through the signal adjusting mechanism in sequence, and the micro-switch contact point trigger element is reset to the state when the gas density is normal.
The limiting part limits the signal adjusting mechanism to move in a certain range, and the micro-switch contact point trigger element always moves in the elastic range; the signal adjusting mechanism is provided with an adjusting screw; the gas density relay further comprises a buffering balance mechanism, and the buffering balance mechanism improves the vibration resistance level of the gas density relay.
The shape of the micro-switch contact point trigger element is straight or bent; the relative position of the microswitch contact activating element and the microswitch can be horizontal or inclined.
The effective width of the contact part of the front end of the contact point trigger element of the microswitch and the signal adjusting mechanism is 4-18 mm.
The gas density relay is characterized by further comprising a limiting mechanism, when the gas density relay is vibrated, the limiting mechanism ensures that the signal adjusting mechanism moves within a normal working range, and the limiting mechanism limits the signal adjusting mechanism to a set corresponding position which is larger than a density alarm value.
The auxiliary piece is fixed at the middle front end of the micro-switch contact triggering element and can improve the local rigidity of the micro-switch contact triggering element made of elastic materials.
The microswitch contact actuating element, which is made of an elastic material, is locally reduced in width, or is locally notched or is locally perforated.
The temperature compensation element is a bimetallic strip or a gas-filled bourdon tube.
The signal control part is provided with a malfunction prevention mechanism.
The gas density relay also comprises a pressure sensor, a temperature sensor, a signal processing unit and a signal transmission unit, and has a remote signal to realize the online density monitoring.
When the gas density value changes, the Bourdon tube and the temperature compensation element generate displacement, the displacement drives the microswitch contact point trigger element sequentially through the signal adjusting mechanism, and when the gas density value reaches a corresponding set value, the microswitch contact point trigger element presses or is far away from a button of the microswitch, so that the microswitch generates a corresponding signal, and the function of a gas density relay is completed;
when the gas density value returns to normal, the Bourdon tube and the temperature compensation element generate corresponding displacement, the displacement drives the micro-switch contact point trigger element through the signal adjusting mechanism in sequence, and the micro-switch contact point trigger element is reset to the state when the gas density is normal.
When the signal regulating mechanism produces the displacement, micro-gap switch contact trigger element relies on micro-gap switch contact trigger element self elasticity or relies on signal regulating mechanism's thrust also and follows the production displacement this moment, when the setting value, makes micro-gap switch sends corresponding warning or blocking signal, and when gas density value is normal, micro-gap switch contact trigger element resets to the state when gas density is normal.
Compared with the prior art, the high-precision gas density relay has the following obvious advantages and characteristics because of adopting the technical method:
1. the method adopts the microswitch as the signal generator of the gas density relay, so that the reliable conduction of the contact can be ensured, and the reliable work of the system can be ensured.
2. The method adopts the microswitch contact point trigger element made of elastic material, and the microswitch contact point trigger element enables the microswitch to send out a corresponding alarm or locking signal by the elasticity of the microswitch contact point trigger element or the thrust of a signal adjusting mechanism. The microswitch contact point trigger element made of the elastic material is correspondingly fixed with the microswitch, has no gap and cannot swing, so that the precision is not deteriorated, and the precision of the gas density relay is not influenced during vibration or transportation, so that the precision of the gas density relay is stable. Meanwhile, during debugging, the precision is very easy to be adjusted accurately, and a high-precision density relay is very easy to be manufactured.
Drawings
The present invention will be further explained with reference to the accompanying drawings:
FIG. 1 is a schematic structural diagram of a microswitch of a pointer type gas density relay in the prior art;
fig. 2 is a schematic structural diagram of a high-precision gas density relay according to a first embodiment of the present invention;
fig. 3 is a schematic cross-sectional view of a high-precision gas density relay according to a first embodiment of the present invention;
FIG. 4 is a diagram illustrating the signal structure of the micro-switch of the high-precision gas density relay according to the first embodiment of the present invention;
fig. 5 is a schematic cross-sectional view of a high-precision gas density relay according to a second embodiment of the present invention;
fig. 6 is an explanatory diagram of the microswitch signal structure of the high precision gas density relay according to the second embodiment of the invention;
fig. 7 is an explanatory diagram of the microswitch signal structure of the high precision gas density relay according to the third embodiment of the invention;
fig. 8 is an explanatory diagram of the microswitch signal configuration of the high precision gas density relay according to the fourth embodiment of the invention;
fig. 9 is an explanatory diagram of the microswitch signal configuration of the high precision gas density relay according to the fifth embodiment of the invention;
fig. 10 is a schematic cross-sectional view of a high-precision gas density relay according to a sixth embodiment of the present invention;
FIG. 11 is a diagram of one embodiment of a micro-gap switch contact triggering device of the high precision gas density relay of the present invention;
FIG. 12 is a diagram of another embodiment of a microswitch contact activation element of the high precision gas density relay of the present invention;
fig. 13 is an explanatory diagram of the signal structure of the microswitch of the high precision gas density relay according to the seventh embodiment of the present invention.
Detailed Description
In order to make the objects, methods, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a high-precision gas density relay as an example for explanation and explanation by a method for improving the precision of the gas density relay. Referring to fig. 2, 3 and 4, fig. 2 and 3 are schematic partial cross-sectional views of a sulfur hexafluoride gas density relay according to a first embodiment of the present inventionAs shown in fig. 2, 3 and 4, the first embodiment of the present invention discloses a high-precision gas density relay, which uses SF6A gas density relay is an example. The invention has high-precision SF6The gas density relay mainly comprises a connector 1, a display core 2, a meter shell 3, a dial 4, a pointer 5, a Bourdon tube 6, a temperature compensation sheet 7 (the width is 5.5-18 mm), a wire holder 8, a plurality of (three in this case) micro switches 91, 92 and 93, a printed circuit board 10, a fixing plate 11, a signal adjusting mechanism 12, a plurality of adjusting screws 131, 132 and 133, a pull rod 14, meter glass 15, a cover ring 16, a limiting mechanism 17, an end seat 18, a base 19, micro switch contact triggering elements 201, 202 and 203, a limiting part 21, a micro switch contact triggering element fixing part 22, an anti-misoperation mechanism 23 and the like. Wherein the joint 1 is fixed to the case 3 and the display movement 2 is fixed to the base 19. The bourdon tube 6 is welded at one end to the base 19 and communicates therewith, and at the other end to the end seat 18. And the end seat 18 is connected with one end of the temperature compensation sheet 7, and the other end of the temperature compensation sheet 7 is connected with the signal adjusting mechanism 12. Three adjusting screws 131, 132, 133 are fixed to the signal adjusting mechanism 12. The signal conditioning mechanism 12 is in turn connected to a link 15, which link 15 is in turn connected to the display movement 2. The three microswitches 91, 92, 93 are fixed to a printed circuit board 10, respectively, the printed circuit board 10 being fixed to a fixing plate 11, the fixing plate 11 being in turn mounted on the base 19. The microswitches 91, 92, 93 are all push-button microswitches with buttons 9101, 9201, 9301, respectively. The microswitch contact point trigger elements 201, 202 and 203 are made of high-performance elastic materials, have good elasticity, cannot cause the problem of elastic failure in a certain stress range, can be made of high-performance elastic materials such as 65Mn steel, beryllium bronze and the like, and can also be made of non-metal materials with plastic materials. The microswitch contact triggering elements 201, 202 and 203 are fixed in the shell through the microswitch contact triggering element fixing part 22, the microswitch contact triggering elements 201, 202 and 203 are respectively arranged corresponding to the microswitches 91, 92 and 93, namely the microswitch contact triggering elements 201, 202 and 203 are respectively arranged corresponding to the buttons 9101, 9201 and 9301 of the microswitches 91, 92 and 93, and the microswitch contact triggering element 201, the microswitch contact triggering element fixing part 22 and the microswitch contact triggering element fixing part 22 are respectively arranged in the shell,202. 203 are correspondingly disposed above the adjusting screws 131, 132, 133, as shown in fig. 4, wherein the micro-switch contact triggering element 201 is fixed above the adjusting screw 131, the micro-switch contact triggering element 202 is fixed above the adjusting screw 132, and the micro-switch contact triggering element 203 is fixed above the adjusting screw 133. The limiting member 21 is fixed in the housing, and the limiting member 21 is disposed corresponding to the micro switch contact triggering elements 201, 202, 203. The pointer 5 and the dial 4 are fixed to the display movement 2, respectively. The signal contacts of the microswitch are connected by wires from the printed circuit board 10 to the wire holder 8, and the wire holder 8 is fixed to the case 3. The watch glass 15 and the bezel 16 are fixed to the case 3, respectively, and protect the internal mechanism from mechanical damage and intrusion of dirt and rainwater. The limiting mechanism 17 is fixed in the shell, and a gap is reserved between the limiting mechanism 17 and the signal adjusting mechanism 12. The limiting mechanism 17 is used for preventing the signal adjusting mechanism 12 from generating excessive displacement along the axial direction thereof when the switch is switched on and off to generate vibration, preventing the adjusting screws 131, 132 and 133 from being clamped or separated from the micro-switch contact triggering elements 201, 202 and 203 and ensuring the reliable work of the system. In this embodiment, the microswitch contact triggering elements 201, 202, 203 are straight in shape; the relative positions of the microswitch contact triggering elements 201, 202 and 203 and the microswitches 91, 92 and 93 are horizontal; the temperature compensation element 7 is made of a bimetallic sheet material or is a gas-filled compensated bourdon tube.
In addition, the relay is also provided with an error-action-preventing mechanism 23, when the gas density relay is vibrated, the error-action-preventing mechanism 23 can limit the amplitude of the Bourdon tube 6 and the signal regulating mechanism 12, thereby greatly improving the vibration resistance of the relay and ensuring the reliable operation of the system.
The action principle of the high-precision gas density relay is based on an elastic element Bourdon tube 6, and the temperature compensation sheet 7 is used for correcting the changed pressure and temperature and changing the density of the reaction gas. I.e. in the medium under test (e.g. SF)6) Under the action of gas pressure, the change of density value and pressure value due to the action of the temperature compensation sheet 7 forces the end of the Bourdon tube 6 to generate corresponding elastic deformation-displacementThe measured gas density is transmitted to the display movement 2 by means of the temperature compensation plate 7 and the connecting rod 15, and the display movement 2 is transmitted to the pointer 5, so that the measured gas density is indicated on the dial 4. If air leaks, the density value of the air leakage is reduced to a certain degree (reaching an alarm or locking value), the Bourdon tube 6 generates corresponding downward displacement, the signal adjusting mechanism 12 is displaced downward through the temperature compensation sheet 7, the adjusting screws 131, 132 and 133 on the signal adjusting mechanism 12 gradually leave the corresponding micro switch contact triggering elements 201, 202 and 203, the micro switch contact triggering elements 201, 202 and 203 gradually leave the buttons 9101, 9201 and 9301 of the corresponding micro switches 91, 92 and 93, and when the air leakage reaches a certain degree, the corresponding micro switches 91, 92 and 93 are connected to send corresponding signals (alarming or locking) so as to monitor and control the density of the air in equipment such as an electric switch and the like and enable the electric equipment to work safely. If the density value is increased, the pressure value is correspondingly increased to a certain degree, the Bourdon tube 6 is also correspondingly displaced upwards, the signal adjusting mechanism 12 is displaced upwards through the temperature compensation sheet 7, the adjusting screws 131, 132 and 133 on the signal adjusting mechanism 12 are displaced upwards, the corresponding micro switch contact triggering elements 201, 202 and 203 are pushed to be displaced upwards, the contacts of the micro switches 91, 92 and 93 are disconnected, and the signals (alarm or locking) are released.
The micro switch and the adjusting screw are not limited to three, and can be one, two, four or more.
Fig. 5 is a schematic partial cross-sectional view of a sulfur hexafluoride gas density relay according to a second embodiment of the present invention, and as shown in fig. 5 and 6, the micro switch contact point trigger elements 201, 202, and 203 are correspondingly disposed below the adjusting screws 131, 132, and 133, that is, the micro switch contact point trigger element 201 is fixed below the adjusting screw 131, the micro switch contact point trigger element 202 is fixed below the adjusting screw 132, and the micro switch contact point trigger element 203 is fixed below the adjusting screw 133. The limiting member 21 is fixed in the housing, and the limiting member 21 is disposed corresponding to the micro switch contact triggering elements 201, 202, 203. If the density value of the electrical equipment leaks air and is reduced to a certain degree (reaching an alarm or locking value), the Bourdon tube 6 generates corresponding downward displacement, the signal adjusting mechanism 12 is displaced downward through the temperature compensation sheet 7, the adjusting screws 131, 132 and 133 on the signal adjusting mechanism 12 are close to the corresponding micro-switch contact triggering elements 201, 202 and 203, the micro-switch contact triggering elements 201, 202 and 203 are close to the buttons 9101, 9201 and 9301 of the corresponding micro-switches 91, 92 and 93, and when the density value reaches a certain degree, the micro-switch contact triggering elements 201, 202 and 203 respectively drive the corresponding micro-switches 91, 92 and 93 to be connected to send corresponding signals (alarm or locking) so as to monitor and control the gas density in the equipment such as the electrical switches and the like and ensure that the electrical equipment works safely. If the density value is increased, the pressure value is correspondingly increased to a certain degree, the Bourdon tube 6 is also correspondingly displaced upwards, the signal adjusting mechanism 12 is displaced upwards through the temperature compensation sheet 7, the adjusting screws 131, 132 and 133 on the signal adjusting mechanism 12 are displaced upwards, the corresponding micro switch contact triggering elements 201, 202 and 203 are displaced upwards under the action of the self elastic force and the elastic force of the micro switch buttons, so that the contacts of the micro switches 91, 92 and 93 are disconnected, and the signals (alarm or lock) are released. Similarly, the limiting member 21 limits the movement of the adjusting screws 131, 132, 133 of the signal adjusting mechanism 12 within a certain range, so as to protect the microswitch contact triggering elements 201, 202, 203 from moving within the elastic range all the time, so that the microswitch contact triggering elements 201, 202, 203 do not have the problem of elastic failure within the certain stress range, thereby ensuring the realization of high precision and the long-term stability of contact precision. The effective width of the contact part of the front ends of the micro switch contact point trigger elements 201, 202 and 203 and the adjusting screws 131, 132 and 133 of the signal adjusting mechanism 12 is 4.0-18 mm, and the vibration resistance is improved.
Fig. 7 is an explanatory diagram of a microswitch signal configuration of a high-precision gas density relay according to a third embodiment of the present invention, and as shown in fig. 7, the microswitch contact activating elements 201, 202 and 203 are bent in shape, and the relative positions of the microswitch contact activating elements 201, 202 and 203 and the microswitches 91, 92 and 93 are inclined.
Fig. 8 is an explanatory diagram of the microswitch signal configuration of the high precision gas density relay according to the fourth embodiment of the present invention, and as shown in fig. 8, when the gas density of the electric device is normal, the microswitch contact point activating elements 201, 202, 203 press the buttons 9101, 9201, 9301 of the microswitches 91, 92, 93. When gas leaks, the contact triggering elements 201, 202 and 203 of the micro switches are displaced by means of the pushing force of the adjusting screws 131, 132 and 133 of the signal adjusting mechanism 12 respectively and are far away from the buttons 9101, 9201 and 9301 of the micro switches 91, 92 and 93 respectively, and when a set value is reached, the micro switches send corresponding alarm or locking signals.
Fig. 9 is an explanatory diagram of a microswitch signal structure of a high-precision gas density relay according to a fifth embodiment of the present invention, and as shown in fig. 9, when the gas density of the electric device is normal, the urging force of the adjustment screws 131, 132, 133 of the signal adjustment mechanism 12 causes the microswitch contact point triggering elements 201, 202, 203 to press the buttons 9101, 9201, 9301 of the microswitches 91, 92, 93. When gas leaks, the signal adjusting mechanism and the adjusting screw thereof generate displacement and are far away from the contact triggering element of the microswitch, and the contact triggering element of the microswitch is respectively dependent on the self elastic force and the self elastic force of the button of the microswitch, so that the contact triggering element of the microswitch is far away from the buttons 9101, 9201 and 9301 of the microswitches 91, 92 and 93, and when a set value is reached, the microswitch sends out a corresponding alarm or locking signal.
Fig. 10 is a schematic sectional view of a high-precision gas density relay according to a sixth embodiment of the present invention, and fig. 10 shows a high-precision gas density relay including a signal control part and a display part which are relatively independent from each other; the signal control part comprises a control base 19, a control end seat 18A, a control Bourdon tube 6A, a control temperature compensation element 7A, a signal adjusting mechanism 12 and a plurality of micro switches 91, 92 and 93 serving as signal generators; one end of the control bourdon tube 6A is connected to the control base 19, the other end of the control bourdon tube 6A is connected to one end of the control temperature compensating element 7A, and the other end of the control temperature compensating element 7A is connected to the signal adjusting mechanism 12. The micro switches 91, 92 and 93 are button type micro switches, the gas density relay further comprises micro switch contact point trigger elements 201, 202 and 203 which are made of elastic materials, one ends of the micro switch contact point trigger elements 201, 202 and 203 are fixed in the shell, and the other ends of the micro switch contact point trigger elements are arranged corresponding to the buttons of the button type micro switches 91, 92 and 93 and are abutted against the buttons of each micro switch in a one-to-one correspondence mode. When the gas density value changes, the control bourdon tube 6A and the control temperature compensation element 7A generate displacement, the displacement respectively drives the micro switch contact point trigger elements 201, 202 and 203 through the adjusting screws 131, 132 and 133 of the signal adjusting mechanism 12 in sequence, the micro switch contact point trigger elements 201, 202 and 203 generate position change, and the micro switches 91, 92 and 93 respectively send corresponding signals, so that the function of a gas density relay is completed. The high-precision gas density relay comprises a buffering balance mechanism 24, wherein the buffering balance mechanism 24 has a supporting function on the signal adjusting mechanism 12, and the vibration resistance level of the gas density relay is further improved. In addition, the high-precision gas density relay is adjustably provided with a limiting mechanism 25, the limiting mechanism 25 is provided with elasticity, the signal adjusting mechanism 12 is limited to a set corresponding position which is larger than the density alarm value, and the vibration resistance of the gas density relay can be further improved.
Meanwhile, the high-precision relay of this embodiment further includes a relatively independent indication display portion, as shown in fig. 10, which includes a display bourdon tube 6B, a display temperature compensation element 7B, a display base 19, a display end base 18B, a display movement 2, a dial, and a pointer 5. One end of the display Bourdon tube 6B is connected to the display base 19, the other end of the display Bourdon tube is connected to one end of the display temperature compensation element 7B through the display end seat 18B, the other end of the display temperature compensation element 7B is connected to the display movement 2 through the display connecting rod 14 or the other end of the display temperature compensation element 7B is directly connected to the display movement 2, and the pointer 5 is installed on the display movement 2 and is arranged in front of the dial for indicating the gas density value. The control base and the display base are integrated into a whole and can be separated.
In addition, the high-precision gas density relay can also comprise a pressure sensor, a temperature sensor, a signal processing unit and a signal transmission unit, and has a remote signal so as to realize the online density monitoring.
As shown in fig. 2, 3, and 4, the method for improving the accuracy of a gas density relay according to the present invention includes: comprises a shell 3, a base 19 arranged in the shell 3, an end seat 18, a Bourdon tube 6, a temperature compensation element 7, a signal adjusting mechanism 12 and a plurality of micro switches 91, 92 and 93 used as signal generators; one end of the Bourdon tube 6 is connected to the base 19, the other end of the Bourdon tube 6 is connected to the end seat 18, one end of the temperature compensation element 7 is connected to the end seat 18, and the other end of the temperature compensation element 7 is connected to the signal adjusting mechanism 12; the microswitches 91, 92 and 93 are button type microswitches; the gas density relay also comprises microswitch contact point trigger elements 201, 202 and 203 which are made of elastic materials, one ends of the microswitch contact point trigger elements 201, 202 and 203 are fixed in the shell through a fixing piece 22, and the other ends of the microswitch contact point trigger elements are arranged corresponding to the buttons 9101, 9201 and 9301 of the button type microswitch and are abutted against the buttons 9101, 9201 and 9301 of each microswitch in a one-to-one correspondence manner; when the gas density value changes, the bourdon tube 6 and the temperature compensation element 7 generate displacement, the displacement sequentially passes through the adjusting screws 131, 132 and 133 of the signal adjusting mechanism 12, the adjusting screws 131, 132 and 133 respectively drive the micro switch contact point triggering elements 201, 202 and 203, the micro switch contact point triggering elements 201, 202 and 203 respectively generate position change, so that the micro switches 91, 92 and 93 send corresponding signals, and the function of a gas density relay is completed. That is, when the gas density of the electrical equipment is reduced, the bourdon tube 6 and the temperature compensation element 7 of the gas density relay generate displacement, the signal adjusting mechanism 12 also generates displacement accordingly, and at the moment, the micro switch contact point triggering elements 201, 202 and 203 also generate displacement accordingly, so that the micro switches 91, 92 and 93 send corresponding signals to a certain extent. In a word, when the signal adjusting mechanism 12 is displaced, the micro switch contact triggering elements 201, 202 and 203 are displaced by the elastic force of the micro switch contact triggering elements 201, 202 and 203 or the pushing force of the adjusting screws 131, 132 and 133 of the signal adjusting mechanism 12, so that the micro switch contact triggering elements 201, 202 and 203 are also displaced accordingly, and when a set value is reached, the micro switch sends out a corresponding alarm or locking signal.
The innovation points and core points of the invention are as follows: due to the adoption ofThe microswitch contact point trigger element is made of elastic material, and the microswitch contact point trigger element makes the microswitch send out corresponding alarm or locking signal depending on the elasticity of the microswitch contact point trigger element or the pushing force of the signal regulating mechanism. The microswitch contact point trigger element made of the elastic material is correspondingly fixed with the microswitch, has no gap and cannot swing, so that the precision is not deteriorated, and the precision of the gas density relay is not influenced during vibration or transportation, so that the precision of the gas density relay is stable. Meanwhile, during debugging, the precision is very easy to be adjusted accurately, and a high-precision density relay is very easy to be manufactured. Meanwhile, as the microswitch is adopted as the signal generator of the gas density relay, the reliable conduction of the contact can be ensured, the reliable work of the system is ensured, the safe operation of the power grid is ensured, and the microswitch can be well applied to SF6Etc. of the gas. Through comparison and test, as can be seen from table 1, the contact precision and stability of the gas density relay adopting the technical method of the patent have better performance than those of the density relay in the prior art, have prominent substantive characteristics and remarkable progress, can greatly improve the precision and stability of the microswitch type gas density relay, and ensure the reliable and safe operation of a power grid.
As can be known from table 1, the gas density relay adopting the technology has very good contact precision and stability, meets the high precision requirement, and can improve the environmental adaptability of the gas density relay. At the same time, the key is that the stability is very good, and the precision can not be changed as soon as the vibration happens.
Table 1 comparison table of contact performance of density relay of this patent technology and gas density relay of prior art
The microswitch contact point triggering element can be designed integrally (see figure 11) or can be designed separately. In addition, as shown in fig. 11, the height of the two side baffles at the front end of the micro-switch contact triggering element 203 is 2.6-18mm, the front end of the micro-switch contact triggering element 203 can be respectively provided with an end plate B, and the end plates B and the two side baffles C together form a semi-closed area which can limit the adjusting screw from separating from the micro-switch contact triggering element 203 at the front end of the micro-switch contact triggering element 203. After the measure is adopted, the high-precision gas density relay can avoid the displacement of the micro-switch contact triggering element and the adjusting screw when the switch is switched on and off to generate vibration, so that the adjusting screw cannot be clamped or separated from the micro-switch contact triggering element, and the reliable work of the system is ensured. The vibration resistance of the product is greatly improved. Meanwhile, the part of the front end of each micro-switch contact triggering element, which can be contacted with the adjusting screw, is set to be a rectangular flat plate, and the width of the rectangular flat plate is 4.4-8mm, so that the phenomenon that the micro-switch contact triggering element and the adjusting screw are displaced to cause the adjusting screw not to be clamped or separated from the micro-switch contact triggering element is avoided, the reliable work of a system is ensured, and the vibration resistance of a product is further improved. As shown in fig. 11, the microswitch contact triggering element further comprises an auxiliary piece 26, and the auxiliary piece 26 is fixed at the middle front end of the microswitch contact triggering element. The object is to improve the local rigidity of a microswitch contact triggering element made of an elastic material, and to ensure a support point for displacement (or deformation such as bending) of the microswitch contact triggering element made of the elastic material by fixing the microswitch contact triggering element to the middle front end of the microswitch contact triggering element. Therefore, the difference value between the action and the return of the contact can be ensured to be in a proper range, and the switching difference of the gas density relay is ensured to meet the relevant standard.
As shown in fig. 12, the width of the microswitch contact activating element made of an elastic material is reduced at a part E. That is, the width at the part E is smaller than the width of the leading end. Or partially notched, or partially perforated, as at F. Therefore, the rigidity of the front end of the contact trigger element of the microswitch made of elastic materials is improved, so that the difference value between the action and the return of the contact is ensured to be within a proper range, and the switching difference of the gas density relay is ensured to meet the relevant standard. In summary, the microswitch contact activation element manufactured from an elastic material has a variety of shapes. The manner of fixing is also varied.
As shown in fig. 4, 7 and 13, the shape of the microswitch contact triggering element can be straight or bent, i.e. the shape can be straight or bent at different angles.
In addition, the outer portion of the shell of the gas density relay is wrapped by a heat insulation layer, and the influence of temperature difference is reduced.
In addition, the following steps can be adopted: the tray is arranged at the rear part of the shell, a vibration-proof pad (such as a spring vibration-proof pad) is arranged between the tray and the shell, the movement can also be provided with a damping mechanism, or the movement of the indication value display part is a vibration-proof movement (specifically, the vibration-proof movement comprises a torsion spring), and the shell of the density relay is filled with measures such as vibration-proof oil and the like, so that the vibration-proof performance is improved.
The micro switch and the base are respectively positioned at two sides of the signal adjusting mechanism, namely the micro switch is respectively positioned above the signal adjusting mechanism corresponding to the micro switch; or the microswitch and the base are respectively positioned at one side of the signal adjusting mechanism, namely the microswitch is positioned below the corresponding signal adjusting mechanism.
The high-precision relay of the invention technology can also comprise a holding mechanism after signal action, and also can comprise a holding mechanism and a reset mechanism after signal action.
In conclusion, those skilled in the art should realize that the above embodiments are illustrative only and not limiting to the present invention, and that changes and modifications to the above described embodiments are intended to fall within the scope of the appended claims, as long as they fall within the true spirit of the present invention.
Claims (9)
1. A method of improving the accuracy of a gas density relay, the gas density relay comprising: the device comprises a shell, a base, an end seat, a Bourdon tube, a temperature compensation element, a signal adjusting mechanism and a plurality of micro switches serving as signal generators, wherein the base, the end seat, the Bourdon tube, the temperature compensation element, the signal adjusting mechanism and the micro switches are arranged in the shell; one end of the Bourdon tube is connected to the base in a sealing mode, the other end of the Bourdon tube is connected to the end seat in a sealing mode, one end of the temperature compensation element is connected to the end seat, and the other end of the temperature compensation element is connected with the signal adjusting mechanism; the method is characterized in that the microswitch adopts a button type microswitch; the microswitch contact triggering element is made of elastic materials, one end of the microswitch contact triggering element is fixed in the shell, and the other end of the microswitch contact triggering element is arranged corresponding to the buttons of the button type microswitch and is abutted against the buttons of each microswitch in a one-to-one correspondence manner; when the gas density value changes, the Bourdon tube and the temperature compensation element generate displacement, the displacement drives the microswitch contact point trigger element sequentially through the signal adjusting mechanism, and when the gas density value reaches a corresponding set value, the microswitch contact point trigger element presses or is far away from a button of the microswitch, so that the microswitch generates a corresponding signal, and the function of a gas density relay is completed;
when the gas density value returns to normal, the Bourdon tube and the temperature compensation element generate corresponding displacement, the corresponding displacement drives the micro-switch contact point trigger element through the signal adjusting mechanism in sequence, and the micro-switch contact point trigger element is reset to the state when the gas density is normal.
2. The method as claimed in claim 1, wherein when the gas density of the electrical equipment is reduced, the bourdon tube and the temperature compensation element of the gas density relay are displaced, the signal adjusting mechanism is displaced, and the contact triggering element of the micro switch is displaced, so that the micro switch sends out a corresponding signal.
3. The method for improving the accuracy of a gas density relay according to claim 1, wherein a microswitch contact triggering element made of an elastic material is used, the microswitch contact triggering element makes the microswitch send out a corresponding alarm or locking signal by means of the elasticity of the microswitch contact triggering element or the thrust of a signal adjusting mechanism, and the microswitch contact triggering element made of the elastic material is correspondingly fixed with the microswitch without a gap and without swinging, so that the accuracy of the gas density relay is not affected during vibration or transportation, the accuracy of the gas density relay is stable, and meanwhile, the microswitch is used as a signal generator of the gas density relay, the reliable conduction of the contact can be ensured, and the reliable operation of the system can be ensured.
4. The method for improving the accuracy of the gas density relay according to claim 1, wherein the gas density relay further comprises a display core, a dial and a pointer, one end of the temperature compensation element is connected with the display core through a display link or one end of the temperature compensation element is directly connected with the display core, and the pointer is mounted on the display core and arranged in front of the dial.
5. A method of improving the accuracy of a gas density relay as claimed in claim 1 or 3, wherein: the gas density relay also comprises a limiting piece which limits the signal regulating mechanism to move in a certain range, and the micro-switch contact point trigger element always moves in the elastic range of the micro-switch contact point trigger element; the signal adjusting mechanism is provided with an adjusting screw; the gas density relay also comprises a buffer balance mechanism which improves the vibration resistance level of the gas density relay;
the gas density relay also comprises a limiting mechanism, when the gas density relay is vibrated, the limiting mechanism ensures that the signal adjusting mechanism moves in a normal working range, and the limiting mechanism limits the signal adjusting mechanism to a set corresponding position which is greater than a density alarm value;
the gas density relay further includes an auxiliary member fixed to a middle front end of the micro switch contact activating element, which can improve local rigidity of the micro switch contact activating element made of an elastic material.
6. A method of improving the accuracy of a gas density relay as claimed in claim 1 or 3, wherein: the shape of the micro-switch contact point trigger element is straight or bent; the relative position of the micro switch contact point trigger element and the micro switch is horizontal or has a slope; the effective width of the contact part of the front end of the contact point trigger element of the microswitch and the signal adjusting mechanism is 4-18 mm.
7. A method of improving the accuracy of a gas density relay as claimed in claim 1 or 3, wherein: the micro-switch contact triggering element made of elastic materials is locally reduced in width, or is locally notched, or is locally perforated; the temperature compensation element is a bimetallic strip or a Bourdon tube filled with gas;
the signal control part consists of an end seat, a Bourdon tube, a temperature compensation element, a signal adjusting mechanism and a plurality of micro switches used as signal generators, and the signal control part is provided with an anti-misoperation mechanism; the gas density relay also comprises a pressure sensor, a temperature sensor, a signal processing unit and a signal transmission unit, and has the functions of remotely transmitting signals and realizing the on-line density monitoring.
8. The method for improving the accuracy of a gas density relay according to any one of claims 1 to 4, wherein when the signal adjusting mechanism is displaced, the micro switch contact triggering element is displaced accordingly by the elasticity of the micro switch contact triggering element itself or the pushing force of the signal adjusting mechanism, when the set value is reached, the micro switch is enabled to send out a corresponding alarm or locking signal, and when the gas density value is normal, the micro switch contact triggering element is reset to the state when the gas density is normal.
9. A method for improving the accuracy of a gas density relay comprises a relatively independent signal control part and a value display part; the signal control part comprises a control base, a control end seat, a control Bourdon tube, a control temperature compensation element, a signal adjusting mechanism and a plurality of micro switches serving as signal generators; one end of the control Bourdon tube is hermetically connected to the control base, the other end of the control Bourdon tube is hermetically connected to the control end seat, one end of the control temperature compensation element is connected to the control end seat, and the other end of the control temperature compensation element is connected with the signal adjusting mechanism; the indicating value display part comprises a display Bourdon tube, a display temperature compensation element, a display base, a display end seat, a display core, a dial and a pointer, one end of the display Bourdon tube is hermetically connected to the display base, the other end of the display Bourdon tube is hermetically connected to the display end seat, one end of the display temperature compensation element is connected to the display end seat, the other end of the display temperature compensation element is connected with the display core through a display connecting rod or the other end of the display temperature compensation element is directly connected with the display core, and the pointer is installed on the display core and arranged in front of the dial; the gas density relay includes a housing;
the method is characterized in that the microswitch adopts a button type microswitch;
the microswitch contact triggering element is made of elastic materials, one end of the microswitch contact triggering element is fixed in the shell, and the other end of the microswitch contact triggering element is arranged corresponding to the buttons of the button type microswitch and is abutted against the buttons of each microswitch in a one-to-one correspondence manner;
when the gas density value changes, the control Bourdon tube and the control temperature compensation element generate displacement, the displacement drives the microswitch contact point trigger element sequentially through the signal adjusting mechanism, and when the gas density value reaches a corresponding set value, the microswitch contact point trigger element presses or is far away from a button of the microswitch, so that the microswitch generates a corresponding signal, and the function of a gas density relay is completed;
when the gas density value returns to normal, the control Bourdon tube and the control temperature compensation element generate corresponding displacement, the corresponding displacement drives the micro-switch contact point trigger element through the signal adjusting mechanism in sequence, and the micro-switch contact point trigger element is reset to the state when the gas density is normal.
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| CN109243914B (en) * | 2018-09-28 | 2024-03-29 | 上海乐研电气有限公司 | Method for improving accuracy of gas density relay and gas density relay |
| CN109947336B (en) * | 2019-03-14 | 2022-02-25 | 广东美的厨房电器制造有限公司 | Interaction assembly and household appliance |
| CN110411890B (en) * | 2019-09-04 | 2024-06-21 | 上海乐研电气有限公司 | On-site detection device, system and method for realizing maintenance-free gas density relay |
| CN117470711B (en) * | 2023-12-28 | 2024-05-14 | 国网江西省电力有限公司电力科学研究院 | Intelligent gas density monitoring device with self-checking function |
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| CH528142A (en) * | 1971-02-24 | 1972-09-15 | Bbc Brown Boveri & Cie | Pressure dependent temperature compensated switch |
| DE2926260A1 (en) * | 1979-06-29 | 1981-01-08 | Bbc Brown Boveri & Cie | Gas density monitor for gas filled HV switchgear - has bourdon tube enclosed in gas to operate indicator |
| CN103700541B (en) * | 2014-01-16 | 2016-04-20 | 上海乐研电气科技有限公司 | A kind of sulfur hexafluoride gas density relay of thin type |
| CN104377051A (en) * | 2014-12-04 | 2015-02-25 | 贵州华阳电工有限公司 | Triggering switch-over device |
| CN105206470A (en) * | 2015-10-27 | 2015-12-30 | 上海乐研电气科技有限公司 | Sulfur hexafluoride gas density relay |
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Denomination of invention: A method for improving the accuracy of gas density relay Effective date of registration: 20211118 Granted publication date: 20200602 Pledgee: Shanghai Rural Commercial Bank Co.,Ltd. Huangpu sub branch Pledgor: SHANGHAI ROYE ELECTRIC Co.,Ltd. Registration number: Y2021310000103 |
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