CN111637258B - Portable needle type exhaust joint and sulfur hexafluoride density relay checking method - Google Patents

Portable needle type exhaust joint and sulfur hexafluoride density relay checking method Download PDF

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Publication number
CN111637258B
CN111637258B CN202010485944.8A CN202010485944A CN111637258B CN 111637258 B CN111637258 B CN 111637258B CN 202010485944 A CN202010485944 A CN 202010485944A CN 111637258 B CN111637258 B CN 111637258B
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China
Prior art keywords
sulfur hexafluoride
regulating valve
density relay
valve
thimble
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CN202010485944.8A
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Chinese (zh)
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CN111637258A (en
Inventor
邓集瀚
文文
李光辉
马鸿波
付强
陈垲
黄道杰
梁晨
马红东
沈应靠
刘建华
李强
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Dali Bureau of Extra High Voltage Transmission Co
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Dali Bureau of Extra High Voltage Transmission Co
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Priority to CN202010485944.8A priority Critical patent/CN111637258B/en
Publication of CN111637258A publication Critical patent/CN111637258A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00—Check valves
    • F16K15/18—Check valves with actuating mechanism; Combined check valves and actuated valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/02—Construction of housing; Use of materials therefor of lift valves
    • F16K27/0209—Check valves or pivoted valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/04—Construction of housing; Use of materials therefor of sliding valves
    • F16K27/041—Construction of housing; Use of materials therefor of sliding valves cylindrical slide valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
    • F16K3/22—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution
    • F16K3/24—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution with cylindrical valve members
    • F16K3/246—Combination of a sliding valve and a lift valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
    • F16K3/30—Details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
    • F16K3/30—Details
    • F16K3/314—Forms or constructions of slides; Attachment of the slide to the spindle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/44—Mechanical actuating means
    • F16K31/60—Handles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L29/00—Joints with fluid cut-off means
    • F16L29/007—Joints with cut-off devices controlled separately
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L27/00—Testing or calibrating of apparatus for measuring fluid pressure
    • G01L27/002—Calibrating, i.e. establishing true relation between transducer output value and value to be measured, zeroing, linearising or span error determination
    • G01L27/005—Apparatus for calibrating pressure sensors

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Valve Housings (AREA)
  • Sampling And Sample Adjustment (AREA)

Abstract

The invention discloses a portable needle type exhaust joint, which comprises a sulfur hexafluoride density relay, a second regulating valve and a first regulating valve communicated with the sulfur hexafluoride density relay, wherein the first regulating valve is used for introducing sulfur hexafluoride gas in the sulfur hexafluoride density relay into the first regulating valve and controlling the air entraining speed; the second regulating valve is communicated with the first regulating valve and used for discharging sulfur hexafluoride gas in the first regulating valve and controlling the exhaust rate. The invention can realize flexible and accurate adjustment of the gas pressure in the SF6 density relay and improve the verification quality.

Description

Portable needle type exhaust joint and sulfur hexafluoride density relay checking method
Technical Field
The invention relates to the technical field of sulfur hexafluoride density relay verification, in particular to a portable needle type exhaust joint and a sulfur hexafluoride density relay verification method.
Background
The sulfur hexafluoride circuit breaker is a circuit breaker using sulfur hexafluoride (SF6) gas as an arc extinguishing medium and an insulating medium, and is called SF6 circuit breaker for short, the sulfur hexafluoride circuit breaker is provided with an SF6 density relay, the SF6 pressure in the circuit breaker is monitored, and the SF6 density relay is generally provided with two pairs of nodes for alarming and locking. The SF6 density relay comprises a four-way valve body, wherein 3 end faces of the four-way valve body are respectively provided with an air supply interface, an air inlet interface and a density meter interface, the air supply interface is connected with a quick joint with a self-sealing function, and the quick joint is similar to an inflating valve structure. During annual maintenance, a quick connector exhaust method is usually adopted to carry out simple functional verification on the SF6 density relay, namely, an air inlet interface end of the SF6 density relay is closed, a small amount of sulfur hexafluoride gas is sealed in a valve body of the SF6 density relay, an exhaust connector is connected to the quick connector, the pressure value in the valve body of the SF6 density relay is reduced through the exhaust connector, the pressure value in the cavity is made to be equal to an alarm pressure value, and verification of the alarm pressure value is realized by checking an alarm signal of the circuit breaker with a supervision panel personnel; further reduce the pressure value in the valve body, make the pressure value in the cavity equal to the warning lockout value, through checking circuit breaker blocking signal with the prison dish personnel, realize the check-up of shutting pressure value. The discharge valve among the prior art is difficult to realize the accurate control to exhaust speed, and after the pressure check of the node of reporting an emergency and asking for help or increased vigilance was accomplished, exhaust speed was fast, often made SF6 density relay valve body internal pressure directly reduce to the numerical value that is far less than the shutting pressure value, can't realize the more accurate check-up to the shutting pressure value, need open many times and close inlet port end and dismouting quick-operation joint, increased the experimenter work load by a wide margin, also increased the SF6 emission to atmosphere.
The prior published Chinese utility model patent with the patent name of 'a needle valve with a valve seat capable of being replaced on line' and the publication number of CN208364820U moves in a valve body through a hand wheel driving valve rod, and realizes the control of the opening degree of a needle valve air inlet and an air outlet through the valve rod so as to realize the control of air exhaust.
Although the above patent can realize the control of the deflation speed, the difference between the alarm and the pressure value of the locking node on the SF6 density relay is small, the difference is usually between 0.1 and 0.2Mpa, and the SF6 gas content in the SF6 density relay is small, and the control precision is not enough to realize the accurate verification of the locking pressure value.
Disclosure of Invention
The invention aims to provide a portable needle type exhaust joint which is designed for functional verification of an SF6 density relay, can realize flexible and accurate adjustment of gas pressure in an SF6 density relay, improves verification quality and reduces pollution of SF6 to the atmosphere.
The embodiment of the invention is realized by the following technical scheme:
a portable needle type exhaust joint comprises a sulfur hexafluoride density relay, a second regulating valve and a first regulating valve communicated with the sulfur hexafluoride density relay, wherein the first regulating valve is used for introducing sulfur hexafluoride gas in the sulfur hexafluoride density relay into the first regulating valve and controlling the air entraining speed; the second regulating valve is communicated with the first regulating valve and used for discharging sulfur hexafluoride gas in the first regulating valve and controlling the exhaust rate.
In an embodiment of the invention, the first regulating valve comprises a thimble ventilating structure for introducing sulfur hexafluoride gas into the valve body from the valve port.
In an embodiment of the invention, the sulfur hexafluoride density relay is provided with an air supply interface for connecting with the first regulating valve; the first regulating valve comprises an ejector pin which is used for being abutted against the air supplement interface and is used for applying pressure to the air supplement interface and opening the air supplement interface so as to introduce sulfur hexafluoride gas in the sulfur hexafluoride density relay into the first regulating valve.
In an embodiment of the invention, the first adjusting valve is configured with a thimble rotating wheel connected to the thimble, and is configured to drive the thimble to extend or retract so as to apply pressure to open the air supplement interface or release pressure to close the air supplement interface.
In an embodiment of the invention, the first regulating valve includes a thimble for abutting against the sulfur hexafluoride density relay, and the thimble ventilation structure includes a thimble ventilation hole configured on the thimble for introducing sulfur hexafluoride gas into the valve body from the valve port.
In an embodiment of the present invention, the thimble ventilation hole includes a long hole disposed in the thimble and a pair of short holes disposed at both ends of the long hole, the long hole is disposed along an axial direction of the thimble, and the pair of short holes are disposed along a radial direction of the thimble and communicate with the long hole.
In an embodiment of the invention, the first regulating valve includes an air intake cavity for accommodating the thimble, a support ring sleeved on the thimble is arranged on the inner wall of the air intake cavity, and the support ring is located at one end of the air intake cavity connected with the sulfur hexafluoride density relay; the pair of short pore channels are respectively positioned at two sides of the support ring.
In an embodiment of the present invention, the second regulating valve is communicated with the gas taking cavity.
In an embodiment of the invention, the first regulating valve is provided with a butt nut for connecting with the sulfur hexafluoride density relay.
A method for checking a sulfur hexafluoride density relay, which comprises the following steps,
s1, closing the air inlet end of the sulfur hexafluoride density relay to seal a small amount of sulfur hexafluoride gas in the sulfur hexafluoride density relay;
s2, communicating the first regulating valve with the sulfur hexafluoride density relay gas supplementing interface, opening the gas supplementing interface through the first regulating valve, enabling sulfur hexafluoride gas to enter the first regulating valve from the sulfur hexafluoride density relay, and rotating the thimble rotating wheel to control the speed of the sulfur hexafluoride gas entering the first regulating valve;
s3, opening a second regulating valve, discharging sulfur hexafluoride gas in the first regulating valve through the second regulating valve, and rotating a needle valve regulating knob to control the exhaust rate of the second regulating valve;
s4, when the pressure value in the sulfur hexafluoride density relay is reduced to the alarm pressure value, checking the alarm signal of the circuit breaker with the monitoring panel personnel to realize the checking of the alarm pressure value;
s5, adjusting the exhaust rate of the second adjusting valve, and when the pressure value in the sulfur hexafluoride density relay is reduced to the alarm locking value, checking the circuit breaker locking signal through checking with a supervision personnel to realize the checking of the locking pressure value.
The technical scheme of the embodiment of the invention at least has the following advantages and beneficial effects:
according to the embodiment of the invention, the extension amount of the thimble is adjusted through the thimble rotating wheel of the first adjusting valve, so that the control of a gas-entraining link is realized; the opening degree of the gas inlet and outlet channel is adjusted through the needle valve adjusting knob by adding the first adjusting valve and the second adjusting valve, so that the control of an exhaust link is realized, the flexible and accurate adjustment of the gas pressure in the SF6 density relay is realized through twice adjustment of the first adjusting valve and the second adjusting valve, the checking quality is improved, the workload of testers is reduced, sulfur hexafluoride gas discharged to the atmosphere due to multiple checking is reduced, and the pollution of the sulfur hexafluoride gas to the atmosphere is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of a first air intake chamber and a second air intake chamber in the present invention;
fig. 3 is an appearance diagram of the present invention.
Icon:
1-a first adjusting valve, 11-a connecting nut, 12-an air intake cavity, 13-an ejector pin guide sealing mechanism, 14-an ejector pin, 141-a long hole channel, 142-a short hole channel, 15-an ejector pin rotary wheel, 16-a first air inlet cavity, 17-a second air inlet cavity, 21-a needle valve cavity and 22-a needle valve adjusting knob.
Detailed Description
In order to make the objects, 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. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the 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.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that if the terms "inside", "outside", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually placed when the product of the present invention is used, the description is merely for convenience of describing the present invention and simplifying the description, but the indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation and operation, and thus, cannot be understood as the limitation of the present invention.
In the description of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "configured," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1 to 3, a portable needle type exhaust joint includes a sulfur hexafluoride density relay, a second regulating valve 2, and a first regulating valve 1 communicated with the sulfur hexafluoride density relay, where the first regulating valve 1 is used to introduce sulfur hexafluoride gas in the sulfur hexafluoride density relay into the first regulating valve 1 and control an air-entraining rate; the second regulating valve 2 is communicated with the first regulating valve 1, and the second regulating valve 2 is used for discharging sulfur hexafluoride gas in the first regulating valve 1 and controlling the exhaust rate.
In order to realize flexible and accurate adjustment of gas pressure in an SF6 density relay, improve verification quality, reduce workload of testing personnel and reduce pollution of SF6 to the atmosphere, the technical scheme is that a first adjusting valve 1 and a second adjusting valve 2 which are integrated into a whole are arranged, the first adjusting valve 1 comprises a gas taking cavity 12, an ejector pin 14, a connecting nut 11, an ejector pin guide sealing mechanism 13, an ejector pin rotary wheel 15 and other structures, the gas taking cavity 12 is a tubular structure which is made of brass and has two open ends, the ejector pin guide sealing mechanism 13 is arranged at one end of the gas taking cavity 12, the connecting nut 11 is arranged at the other end of the gas taking cavity 12 and is used for connecting the gas taking cavity 12 with a sulfur hexafluoride density relay gas supplementing interface 3, the ejector pin 14 is arranged in the gas taking cavity 12, the ejector pin guide sealing mechanism 13 comprises a seat body which is configured to be in threaded connection with the gas taking cavity 12 and a sealing ring which is arranged in the seat body, the thimble rotary wheel 15 is connected with a threaded rod, the threaded rod is inserted into the base body and is in threaded connection with the base body, the threaded rod penetrates through the base body and then is fixed with the thimble 14, the sealing ring and the threaded rod realize dynamic sealing, the thimble rotary wheel 15 is rotated, the thimble rotary wheel 15 drives the threaded rod to extend or retract relative to the base body, and the threaded rod drives the thimble 14 to extend or retract relative to the air intake cavity 12. The second regulating valve 2 comprises an air inlet and outlet passage, a needle valve cavity 21, a valve rod arranged in the needle valve cavity 21 and a needle valve regulating knob 22 connected with the valve rod, the valve rod is provided with external threads, the valve rod is in threaded connection with internal threads in the needle valve cavity 21, a sealing ring is sleeved on the valve rod to realize dynamic sealing of the valve rod and the needle valve cavity 21, the needle valve regulating knob 22 is used for driving the valve rod to rotate, the valve rod is in horizontal movement in the needle valve cavity 21 through the valve rod and the internal threads in the needle valve cavity 21, regulation of the opening degree of the air inlet and outlet passage is realized through movement of the valve rod, and finally control of the exhaust rate of the needle valve is realized. The inner wall of the gas taking cavity 12 of the first regulating valve 1 is provided with a support ring, the support ring is positioned at one end of the gas taking cavity 12 connected with the sulfur hexafluoride density relay gas supplementing interface 3, the thimble 14 penetrates through the support ring, a gap is reserved between the thimble 14 and the support ring to ensure the smoothness of the extending or retracting action of the thimble 14, but the gap between the thimble 14 and the support ring needs to ensure that the support ring can support the thimble 14, so the gap between the thimble 14 and the support ring cannot be too large. And the support ring makes the internal space of the gas taking cavity 12 a first gas inlet cavity 16 and a second gas inlet cavity 17, the first gas inlet cavity 16 and the second gas inlet cavity 17 are respectively positioned at two sides of the support ring, when sulfur hexafluoride gas enters the gas taking cavity 12 from the sulfur hexafluoride density relay gas supplementing interface 3, the sulfur hexafluoride gas firstly enters the first gas inlet cavity 16, because the clearance between the thimble 14 and the support ring is not large, the speed of the sulfur hexafluoride gas entering the second gas inlet cavity 17 from the clearance between the support ring and the thimble 14 is slow, in order to accelerate the sulfur hexafluoride gas entering the second gas inlet cavity 17 from the first gas inlet cavity 16, so as to ensure the adjusting sensitivity of the invention, the thimble 14 is provided with a thimble ventilating structure, which can be a thimble ventilating hole configured on the thimble 14 and used for introducing the sulfur hexafluoride gas into the valve body from the valve port, the thimble ventilating structure comprises a long hole 141 configured in the thimble 14 and a pair of short hole 142 configured at two ends of the long hole 141, the long pore passage 141 is axially arranged along the thimble 14, the pair of short pore passages 142 are radially arranged along the thimble 14 and communicated with the long pore passage 141, and the pair of short pore passages 142 are respectively positioned at two sides of the support ring, namely, one short pore passage 142 is positioned in the first air inlet cavity 16, and the other short pore passage 142 is positioned in the second air inlet cavity 17, so that sulfur hexafluoride gas enters the second air inlet cavity 17 along the short pore passage 142 and the long pore passage 141 after entering the first air inlet cavity 16, the smoothness of the sulfur hexafluoride gas flowing in the gas taking cavity 12 is ensured, and the regulation sensitivity of the invention is ensured.
It should be noted that the connection nut 11 is sleeved outside the air intake cavity 12, and it is ensured that the connection nut 11 can rotate freely and cannot be separated from the air intake cavity 12.
It should be noted that, when the sulfur hexafluoride density relay gas supply interface 3 and the gas taking cavity 12 are connected, in order to ensure the sealing performance of the connection, a sealing ring is arranged between the sulfur hexafluoride density relay gas supply interface 3 and the gas taking cavity 12, so as to avoid sulfur hexafluoride gas leakage and ensure the accuracy of verification.
The working principle of the invention is as follows: during the calibration, a quick connector similar to an inflating valve structure is arranged on the sulfur hexafluoride density relay gas supplementing interface 3, the gas inlet interface end of the sulfur hexafluoride density relay is closed, the connecting nut 11 is connected and sealed with the quick connector, so as to realize the connection of the connecting nut 11 and the sulfur hexafluoride density relay air supplement interface 3, rotate the thimble rotary wheel 15, drive the thimble 14 to extend out of the air taking cavity 12 and touch the quick connector, the thimble 14 presses the quick connector to open the quick connector, sulfur hexafluoride gas sealed in the sulfur fluoride density relay enters the first air inlet cavity 16 through the quick connector, the extension length of the thimble 14 is controlled through the number of turns of the thimble rotating wheel 15, and then the control of the opening of the quick connector is realized, so that the air bleeding speed of sulfur hexafluoride gas in a four-way valve body of the sulfur hexafluoride density relay is controlled, namely the air bleeding link is controlled. After sulfur hexafluoride gas enters the first air inlet cavity 16, the sulfur hexafluoride gas enters the first air inlet cavity 17 along the thimble vent hole, and then the needle valve adjusting knob 22 of the second adjusting valve 2 is rotated to drive the valve rod in the needle valve cavity 21 to act, so that the opening degree of an air inlet and outlet channel in the second adjusting valve 2 is controlled, the rate of the sulfur hexafluoride gas in the gas taking cavity 12 being discharged through the second adjusting valve 2 is realized, and the exhaust link is controlled.
Compared with the prior art, the technical scheme has the advantages that the extension amount of the thimble 14 is adjusted through the thimble rotating wheel 15 of the first adjusting valve 1, so that the control of a gas-entraining link is realized; through increasing at first governing valve 1, second governing valve 2 adjusts business turn over gas passage's aperture through needle valve adjust knob 22 to the realization is to the control of exhaust link, through first governing valve 1 and the twice regulation of second governing valve 2, realizes nimble, the accurate regulation to gas pressure in the SF6 density relay, can improve the control accuracy of gassing speed, improves the check-up quality, reduces tester work load.
A method for checking a sulfur hexafluoride density relay comprises the following steps,
s1, closing the air inlet end of the sulfur hexafluoride density relay to seal a small amount of sulfur hexafluoride gas in the sulfur hexafluoride density relay;
s2, the first adjusting valve 1 is communicated with the sulfur hexafluoride density relay gas supplementing interface 3, the gas supplementing interface 3 is opened through the first adjusting valve 1, sulfur hexafluoride gas enters the first adjusting valve 1 from the sulfur hexafluoride density relay, and the thimble rotating wheel 15 is rotated to control the speed of the sulfur hexafluoride gas entering the first adjusting valve 1;
s3, opening the second regulating valve 2, discharging sulfur hexafluoride gas in the first regulating valve 1 through the second regulating valve 2, and rotating the needle valve regulating knob 22 to control the exhaust rate of the second regulating valve 2;
s4, when the pressure value in the sulfur hexafluoride density relay is reduced to the alarm pressure value, checking the alarm signal of the circuit breaker with the monitoring panel personnel to realize the checking of the alarm pressure value;
s5, adjusting the exhaust rate of the second adjusting valve 2, and when the pressure value in the sulfur hexafluoride density relay is reduced to the alarm lockout value, checking the lockout signal of the circuit breaker by checking the lockout signal with a supervision personnel to realize the check of the lockout pressure value.
The first and second control valves 1 and 2 are adjusted by rotating the thimble rotating wheel 15 reversely to retract the thimble 14 into the first control valve 1 until the thimble 14 cannot be retracted. Then the sulfur hexafluoride density relay is butted and screwed with a gas supplementing interface 3 of the sulfur hexafluoride density relay. The thimble rotating wheel 15 is slowly rotated forward, so that the thimble 14 jacks the air supply interface 3 to conduct air entraining, sulfur hexafluoride gas in the sulfur hexafluoride density relay enters the first regulating valve 1, and then the needle valve regulating knob 22 is slowly rotated backward to start exhausting. The thimble rotary wheel 15 and the needle valve adjusting knob 22 are flexibly rotated to exhaust along with the change of a density meter pointer on the sulfur hexafluoride density relay. When the pointer is near the required pressure, the needle valve adjusting knob 22 is slowly reversed. When the pointer pressure is consistent with the target, the needle adjustment knob 22 is rapidly reversed until the needle adjustment knob 22 cannot be turned, and the signal of the pressure node is verified with the background.
Note that the needle valve adjustment knob 22 is reversed so that the opening degree of the intake/exhaust passage of the second regulator valve 2 becomes large. The needle valve adjusting knob 22 is rotated forward so that the opening degree of the air inlet and outlet passage of the second regulating valve 2 becomes smaller until the second regulating valve 2 is closed.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (6)

1. A portable needle type exhaust joint comprises a second regulating valve (2) and is characterized by further comprising a first regulating valve (1) communicated with a sulfur hexafluoride density relay, wherein the first regulating valve (1) is used for introducing sulfur hexafluoride gas in the sulfur hexafluoride density relay into the second regulating valve (2) and controlling the air entraining speed;
the second regulating valve (2) is communicated with the first regulating valve (1), and the second regulating valve (2) is used for discharging sulfur hexafluoride gas in the first regulating valve (1) and controlling the exhaust rate;
the first regulating valve (1) comprises a thimble ventilating structure for introducing sulfur hexafluoride gas into the valve body from a valve port;
the first regulating valve (1) comprises an ejector pin (14) which is abutted to the sulfur hexafluoride density relay, and the ejector pin ventilation structure comprises an ejector pin ventilation hole which is configured on the ejector pin (14) and is used for introducing sulfur hexafluoride gas into the valve body from a valve port;
the thimble vent hole comprises a long hole (141) arranged in the thimble (14) and a pair of short holes (142) arranged at two ends of the long hole (141), the long hole (141) is axially arranged along the thimble (14), and the pair of short holes (142) is radially arranged along the thimble (14) and communicated with the long hole (141);
the first regulating valve (1) comprises an air taking cavity (12) for accommodating the thimble (14), a support ring sleeved on the thimble (14) is arranged on the inner wall of the air taking cavity (12), and the support ring is positioned at one end of the air taking cavity (12) connected with the sulfur hexafluoride density relay; a pair of the short ducts (142) are respectively located on both sides of the support ring.
2. Portable needle exhaust joint according to claim 1, characterized in that the sulphur hexafluoride density relay is provided with a gas make-up interface (3) for connection with the first regulating valve (1);
the first regulating valve (1) comprises an ejector pin (14) which is used for being abutted to the air supply interface (3) and is used for applying pressure to the air supply interface (3) and opening the air supply interface (3) so as to introduce sulfur hexafluoride gas in the sulfur hexafluoride density relay into the first regulating valve (1).
3. The portable needle type exhaust joint according to claim 2, wherein the first adjusting valve (1) is provided with a thimble rotating wheel (15) connected with the thimble (14) for driving the thimble (14) to extend or retract so as to apply pressure to open or release pressure to the air supply interface (3) to close the air supply interface (3).
4. Portable needle-type exhaust fitting according to claim 1, characterized in that the second regulating valve (2) communicates with the air intake chamber (12).
5. Portable needle type exhaust fitting according to claim 1, characterized in that the first regulating valve (1) is provided with a docking nut (11) for connection with the sulphur hexafluoride density relay.
6. A method of verifying a sulphur hexafluoride density relay using a portable pin type exhaust fitting as claimed in any one of claims 1 to 3, characterised by the steps of,
s1, closing the air inlet end of the sulfur hexafluoride density relay to seal a small amount of sulfur hexafluoride gas in the sulfur hexafluoride density relay;
s2, the first adjusting valve (1) is communicated with the sulfur hexafluoride density relay gas supplementing interface (3), the gas supplementing interface (3) is opened through the first adjusting valve (1), sulfur hexafluoride gas enters the first adjusting valve (1) from the sulfur hexafluoride density relay, and the thimble rotating wheel (15) is rotated to control the speed of the sulfur hexafluoride gas entering the first adjusting valve (1);
s3, opening the second regulating valve (2), discharging sulfur hexafluoride gas in the first regulating valve (1) through the second regulating valve (2), and rotating the needle valve regulating knob (22) to control the exhaust rate of the second regulating valve (2);
s4, when the pressure value in the sulfur hexafluoride density relay is reduced to the alarm pressure value, checking the alarm signal of the circuit breaker with the monitoring panel personnel to realize the checking of the alarm pressure value;
s5, adjusting the exhaust rate of the second adjusting valve (2), and when the pressure value in the sulfur hexafluoride density relay is reduced to the alarm locking value, checking the locking signal of the circuit breaker by checking the circuit breaker locking signal with a supervision personnel to realize the verification of the locking pressure value.
CN202010485944.8A 2020-06-01 2020-06-01 Portable needle type exhaust joint and sulfur hexafluoride density relay checking method Active CN111637258B (en)

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CN112284837A (en) * 2020-10-23 2021-01-29 广东电网有限责任公司广州供电局 Gas taking joint and gas taking method for inflatable power equipment

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