CN114812925B - Power plant condenser vacuum recognition, calculation and detection device and method - Google Patents
Power plant condenser vacuum recognition, calculation and detection device and method Download PDFInfo
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- CN114812925B CN114812925B CN202210480818.2A CN202210480818A CN114812925B CN 114812925 B CN114812925 B CN 114812925B CN 202210480818 A CN202210480818 A CN 202210480818A CN 114812925 B CN114812925 B CN 114812925B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L21/00—Vacuum gauges
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/06—Means for preventing overload or deleterious influence of the measured medium on the measuring device or vice versa
- G01L19/0609—Pressure pulsation damping arrangements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L7/00—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements
- G01L7/16—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements in the form of pistons
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/0089—Transmitting or indicating the displacement of pistons by electrical, electromechanical, magnetic or electromagnetic means
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Abstract
The invention relates to the field of auxiliary measuring instruments of power plants, in particular to a device and a method for vacuum recognition, calculation and detection of a condenser of a power plant. The technical problems to be solved are as follows: the steam turbulence in the condenser affects the measurement, and the high-temperature and high-humidity environment and the pressure fluctuation of the measuring device affect the measurement precision of the device. The invention provides a device and a method for vacuum recognition, calculation and detection of a condenser of a power plant. According to the invention, the influence of disturbance of steam flow on pressure measurement is prevented by the first pressure-transferring cavity, the pressure buffer transfer component is used for sensing and matching the transmission of the pressure in the condenser and the first pressure-transferring cavity, the pressure conversion transfer component is used for sensing the pressure change in the second pressure-transferring cavity, and the pressure change quantity in the second pressure-transferring cavity is transferred through the hydraulic change.
Description
Technical Field
The invention relates to the field of auxiliary measuring instruments of power plants, in particular to a device and a method for vacuum recognition, calculation and detection of a condenser of a power plant.
Background
The vacuum degree in the condenser is used as an index which is most important for influencing the economical efficiency of the steam turbine generator unit, and in the working process of the condenser, the proper vacuum degree in the condenser is adjusted and monitored, so that the available enthalpy drop of steam in the steam turbine is reasonably controlled, the difference between the power increase of the steam turbine and the electricity quantity of the multiple consumption of the circulating water pump is the maximum value, and the maximization of energy conservation and economical efficiency is realized.
When the existing vacuum degree pressure measuring instrument measures the vacuum degree of the condenser, because the inside of the condenser is the steam environment and the steam inside the condenser flows turbulent flow, the pressure measurement of the device can be fluctuated, the measuring precision is affected, and the vacuum pressure measuring instrument is arranged on the air inlet neck of the condenser and is affected by the temperature of the steam in the condenser and the condensation of the steam into water, the pressure detection of the vacuum measuring instrument is affected, corresponding pressure fluctuation can occur in the measurement due to the operation of the steam turbine, and the vacuum measuring instrument is durable as a monitoring instrument which works for a long time.
Aiming at the problems, the utility model provides a device and a method for vacuum recognition, calculation and detection of a condenser of a power plant, which are matched with a high-temperature and high-humidity environment.
Disclosure of Invention
In order to overcome the defect that the measurement accuracy is influenced by the turbulence of steam in the condenser and the influence of pressure fluctuation generated in the high-temperature and high-humidity environment of the measuring device, the device and the method for detecting the vacuum recognition calculation of the condenser of the power plant, which are matched with the high-temperature and high-humidity environment, are provided.
The technical scheme of the invention is as follows: the utility model provides a power plant condenser vacuum recognition calculation detection device and method, including the pressure transmission casing, the pressure transmission casing passes through the flange to be installed on the condenser casing, pressure transmission casing lower part is provided with first pressure delivery chamber, pressure transmission casing upper portion is provided with the second pressure delivery chamber, pressure transmission casing middle part is provided with the cooling cavity, the cooling cavity communicates with the external world through a plurality of intercommunicating pore, pressure transmission casing middle part circumference is provided with a plurality of pressure pipeline, a plurality of pressure pipeline all is used for communicating first pressure delivery chamber and second pressure delivery chamber, a plurality of pressure pipeline aligns with a plurality of intercommunicating pore of cooling cavity respectively, pressure transmission casing upper portion is provided with the closing cap, the closing cap lower part has seted up the constant pressure cavity, initial pressure environment is standard atmospheric pressure in the constant pressure cavity, pressure transmission casing and closing cap top are provided with the pressure gauge, the pressure measuring meter is connected with the terminal equipment through the Internet of things, the pressure buffer transmission assembly is arranged at the lower part in the pressure transmission shell and is positioned in the first pressure transmission cavity, the pressure buffer transmission assembly is used for sensing, buffering and transmitting the pressure in the condenser, the pressure conversion transmission assembly is arranged at the upper part in the pressure transmission shell and penetrates through the sealing cover to be matched with the pressure measuring meter, the pressure buffer transmission assembly is driven by the pressure in the condenser to change the pressure in the second pressure transmission cavity, the pressure conversion transmission assembly converts the air pressure in the second pressure transmission cavity into hydraulic transmission, the internal hydraulic fit changes the pressure in the constant pressure cavity, the pressure conversion transmission assembly and the pressure measuring meter are matched to generate displacement change, the pressure measuring meter senses the displacement change, displays standard signals corresponding to the pressure and transmits the standard signals to the terminal equipment, the inner lower end of the pressure transmission shell is fixedly connected with a limiting ring.
Further, the constant pressure cavity is internally provided with an inert gas environment, a plurality of diversion holes are circumferentially formed in the limiting ring, and the limiting ring is used for limiting the downward limit position of the pressure buffering transmission assembly.
Further, the pressure buffering transmission assembly comprises a buffering piston, the buffering piston is arranged in the first pressure-transferring cavity in a sliding mode, a limiting cavity is formed in the middle of the buffering piston, a pressure sensing piston is arranged in the limiting cavity of the buffering piston in a sliding mode, a first pressure diaphragm is fixedly connected to the upper portion of the limiting cavity of the buffering piston, liquid is arranged in the cavity between the pressure sensing piston and the first pressure diaphragm, a silica gel scraping plate is fixedly connected to the lower surface of the buffering piston, and an outer ring of the silica gel scraping plate is attached to the inner wall of the first pressure-transferring cavity.
Further, two sealing grooves are formed in the outer surface of the buffer piston, piston rings are arranged in the two sealing grooves of the buffer piston, a sealing groove is also formed in the outer peripheral surface of the pressure sensing piston, and a U-shaped sealing ring is arranged in the sealing groove of the pressure sensing piston.
Further, the middle part of the first pressure diaphragm protrudes upwards, the thickness of the outer periphery of the first pressure diaphragm is thicker than that of the middle part of the first pressure diaphragm, and the space between the pressure sensing piston and the first pressure diaphragm is filled with liquid which does not deform.
Further, the pressure conversion transmission assembly comprises a pressure conversion shell, a pressure conversion cavity is formed in the middle of the pressure conversion shell, two pressure transmission holes are symmetrically formed in the left and right of the upper portion of the pressure conversion shell, a second pressure diaphragm is fixedly connected to the lower portion of the pressure conversion cavity of the pressure conversion shell, a pressure changing piston is arranged in the pressure conversion shell in a sliding mode, a plug rod is arranged on the pressure changing piston, the plug rod of the pressure changing piston penetrates through the pressure conversion shell and the sealing cover, the plug rod of the pressure changing piston is in sliding fit with the pressure measuring meter, and liquid is arranged between the pressure changing piston and the second pressure diaphragm.
Further, the diameter of the constant pressure cavity is smaller than the diameter of the pressure conversion cavity of the rotary pressure shell.
Further, the thickness of the second pressure diaphragm gradually decreases from the middle to the outer periphery, and the space between the second pressure diaphragm and the pressure-variable piston is also filled with liquid which does not deform.
Further, still including the cooling casing, cooling casing fixed mounting is in the pressure transmission casing middle part outside, and pressure conduit is located the cooling casing, and a plurality of through-hole has all been seted up to the equal circumference in middle part and the upper portion of cooling casing, and the right part of cooling casing is provided with the fan.
Further, the method comprises the following steps:
step S1: after the device is arranged on a condenser, when the condenser is started, the interior of a condensing cavity of the condenser is pumped into vacuum through a vacuum pump, a vacuum environment is caused at an exhaust port of a steam turbine, steam is condensed into water after entering the condenser, the vacuum degree in the condenser is guaranteed, when the condenser is pumped into vacuum, the vacuum pressure in the condenser drives a pressure buffering transmission assembly to move downwards, the pressure buffering transmission assembly reduces the pressure in a first pressure-transferring cavity at the upper part of the condenser, the pressure in the first pressure-transferring cavity is transmitted to a second pressure-transferring cavity through a pressure pipeline, after the pressure conversion transmission assembly senses the pressure in the second pressure-transferring cavity, the pressure in the constant pressure cavity is changed, the pressure conversion transmission assembly is matched with a pressure measuring meter, the resistance of an inductor in the pressure measuring meter is changed, and then an electronic circuit element detects the resistance change, and is converted and output into a standard signal corresponding to be displayed and transmitted to terminal equipment;
step S2: an operator controls devices such as a vacuum pump and the like through terminal equipment to change the vacuum degree in the condenser, after the vacuum degree reaches the standard, the steam turbine is controlled to start to transfer steam into the condenser, circulation work is started in the condenser, the pressure buffering transfer assembly always senses and keeps the pressure in the first pressure transferring cavity and the pressure in the condenser identical, when the vacuum degree in the condenser changes, the pressure in the first pressure transferring cavity and the pressure in the second pressure transferring cavity are reduced, the pressure in the constant pressure cavity is also reduced after the pressure transferring assembly is transferred, the pressure transferring assembly senses the pressure change amount, the pressure change amount is converted into displacement change in the vertical direction, the pressure measuring meter senses the displacement change amount of the pressure transferring assembly, a relevant pressure value is displayed to transmit a signal to the terminal equipment, and when the vacuum degree is disqualified, the operator is required to change the vacuum degree in the condenser by starting other devices;
step S3: because the temperature is higher in the condenser, operating personnel start the fan work in the course of the work, through fan to cooling shell in the air-blast, flow the air and take away the interior steam of cooling cavity through the intercommunicating pore, and then make the heat that the steam brought distribute to the external world from pressure transmission shell middle part, make the pressure gauge guarantee the normal measuring to the vacuum pressure in the condenser.
The invention has the beneficial effects that: according to the invention, the influence of disturbance of steam flow on pressure measurement is prevented by the first pressure transferring cavity, a buffer effect is generated on pressure fluctuation in the first pressure transferring cavity by the pressure pipeline with slower gas circulation, the pressure buffering transferring component is used for sensing and matching with the transmission of pressure in the condenser and the first pressure transferring cavity, the pressure sensing piston and the first pressure diaphragm move towards the low pressure side together to transfer more accurate pressure change, the pressure converting and transferring component is used for sensing pressure change in the second pressure transferring cavity, the pressure change amount in the second pressure transferring cavity is transferred by hydraulic change, and the moving distance of the buffering piston is reduced to the moving displacement of the pressure changing piston, so that the displacement change amount of the pressure changing piston is larger than the micro displacement of the sensing diaphragm of the traditional vacuum pressure meter by matching with the pressure measuring meter, the accuracy is improved, the measuring range is properly increased, and the pressure transferring shell is cooled by matching with the cooling shell of the fan.
Drawings
Fig. 1 is a schematic perspective view of the present invention.
Fig. 2 is a cross-sectional view of a three-dimensional structure of the present invention.
Fig. 3 is a perspective view of a part of the structure of the present invention.
Fig. 4 is a perspective view of a pressure buffer transfer assembly of the present invention.
Fig. 5 is a schematic perspective view of a pressure conversion and transmission assembly according to the present invention.
FIG. 6 is a schematic perspective view of a portion of a pressure buffer transfer assembly according to the present invention.
Reference numerals: the device comprises a 1-pressure transmission shell, a 101-first pressure-reducing cavity, a 102-second pressure-reducing cavity, a 103-cooling cavity, a 2-pressure pipeline, a 3-sealing cover, a 31-constant pressure cavity, a 4-pressure measuring meter, a 5-buffer piston, a 51-piston ring, a 6-pressure-sensing piston, a 61-U-shaped sealing ring, a 7-first pressure diaphragm, an 8-silica gel scraper, a 9-rotating pressure shell, a 91-pressure-reducing hole, a 10-second pressure diaphragm, a 11-pressure-changing piston, a 12-limiting ring, a 13-cooling shell and a 14-fan.
Detailed Description
The invention is further described below with reference to the drawings and examples.
Example 1
1-3, including pressure transmission casing 1, pressure transmission casing 1 passes through flange fixed mounting on the condenser casing, first pressure-transmitting chamber 101 has been seted up to pressure transmission casing 1 lower part, second pressure-transmitting chamber 102 has been seted up to pressure transmission casing 1 upper portion, cooling cavity 103 has been seted up at pressure transmission casing 1 middle part, cooling cavity 103 communicates with the external world through a plurality of intercommunicating pore, cooling cavity 103 cooperates its intercommunicating pore for cooling pressure transmission casing 1 in work, pressure transmission casing 1 middle part circumference rigid coupling has a plurality of pressure pipeline 2, a plurality of pressure pipeline 2 all are used for communicating first pressure-transmitting chamber 101 and second pressure-transmitting chamber 102, a plurality of pressure pipeline 2 aligns with cooling cavity 103 a plurality of intercommunicating pore respectively, the flowing air of the intercommunicating pore through cooling cavity 103, the pressure pipeline 2 is cooled, a sealing cover 3 is welded at the upper part of the pressure transmission shell 1, a constant pressure cavity 31 is arranged at the lower part of the sealing cover 3, the initial pressure environment in the constant pressure cavity 31 is standard atmospheric pressure, the constant pressure cavity 31 is provided with an inert gas environment, when the gas volume is rapidly changed to generate temperature change, the inert gas is prevented from expanding or condensing to influence pressure measurement, a pressure measurement meter 4 is fixedly arranged at the top ends of the pressure transmission shell 1 and the sealing cover 3, the pressure measurement meter 4 is connected with a terminal device through an Internet of things, a pressure buffer transmission component is slidably arranged at the lower part of the pressure transmission shell 1, the pressure buffer transmission component is positioned in the first pressure transmission cavity 101 and is tightly matched with the first pressure transmission cavity, the pressure buffer transmission component is used for sensing, buffering and transmitting the pressure in a condenser, the upper part of the pressure transmission shell 1 is fixedly provided with a pressure conversion transmission component, the pressure conversion transmission assembly penetrates through the sealing cover 3 to be matched with the pressure measuring meter 4, the pressure buffer transmission assembly is driven by the pressure in the condenser, the pressure in the second pressure transferring cavity 102 is changed, the pressure conversion transmission assembly converts the air pressure in the second pressure transferring cavity 102 into hydraulic transmission, the internal hydraulic cooperation changes the pressure in the fixed pressure cavity 31, therefore, under the same pressure change, the displacement variable quantity of parts in the pressure conversion transmission assembly is far smaller than that of the pressure buffer transmission assembly, the pressure conversion transmission assembly and the pressure measuring meter 4 are matched to change in displacement, the pressure measuring meter 4 senses the displacement change, a standard signal corresponding to the pressure is displayed and transmitted to the terminal equipment, the lower end in the pressure transmission shell 1 is fixedly connected with the limiting ring 12, a plurality of guide holes are circumferentially formed in the limiting ring 12, and the limiting ring 12 is used for limiting the downward limit position of the pressure buffer transmission assembly.
After an operator starts the condenser to work, the internal pressure drives the pressure buffer transmission assembly to move downwards, the pressure in the first pressure transmission cavity 101 is reduced, the pressure in the first pressure transmission cavity 101 and the pressure in the second pressure transmission cavity 102 are reduced together through the transmission of the pressure pipeline 2, the limiting ring 12 is used as the limiting of the measurement limit value of the pressure measurement meter 4, the pressure buffer transmission assembly is prevented from moving out of the pressure transmission shell 1, the pressure conversion transmission assembly senses the pressure change in the second pressure transmission cavity 102, the pressure of gas is converted into the liquid pressure, the pressure in the fixed pressure cavity 31 is reduced, the pressure conversion transmission assembly and the pressure measurement meter 4 are matched to change in displacement, the matching distance between the pressure conversion transmission assembly and the pressure measurement meter 4 is reduced, the pressure measurement meter 4 senses the displacement change of the pressure conversion transmission assembly, the resistance of the internal sensor is changed, after detecting the change through the internal electronic circuit components, converting the change into a standard signal of corresponding pressure to display and transmit the standard signal to the terminal equipment, wherein the pressure in the first pressure transmitting cavity 101 and the pressure in the condenser are regulated through the internal regulation of the pressure buffering transmission component due to the resistance between the pressure buffering transmission component and the pressure transmission shell 1, when the pressure in the condenser fluctuates, the pressure fluctuation of the pressure buffering transmission component is matched with the movement of the pressure buffering transmission component to realize the fluctuation buffering transmission of the gas transmission in the first pressure transmitting cavity 101 and the second pressure transmitting cavity 102, the pressure fluctuation of the pressure buffering transmission cannot be directly transmitted to the pressure measuring meter 4, and the internal steam of the pressure buffering transmission component can partially enter the pressure transmission shell 1 due to the flowing steam environment in the condenser, so that the influence of the disturbance of the steam flow on the pressure measurement is prevented through the first pressure transmitting cavity 101, and the water drop that steam condensed on the inside wall of first pressure-reducing cavity 101 is scraped through pressure buffer transfer subassembly, prevents that it from causing the influence to the gas tightness when pressure buffer transfer subassembly and pressure transfer casing 1 slip fit, after the condenser stop work, this device naturally resets under the drive of the internal atmospheric pressure of first pressure-reducing cavity 101, second pressure-reducing cavity 102 and constant pressure cavity 31.
Example 2
On the basis of embodiment 1, as shown in fig. 3 and 4, the pressure buffer transmission assembly comprises a buffer piston 5, the buffer piston 5 is arranged in a first pressure transferring cavity 101 in a sealing sliding manner, a limiting cavity is formed in the middle of the buffer piston 5, a pressure sensing piston 6 is arranged in the limiting cavity of the buffer piston 5 in a sliding manner, a first pressure diaphragm 7 is fixedly arranged on the upper portion of the limiting cavity of the buffer piston 5, a liquid environment is arranged in the cavity between the pressure sensing piston 6 and the first pressure diaphragm 7, liquid which is not deformed is filled between the pressure sensing piston 6 and the first pressure diaphragm 7, the liquid deformation is small, the pressure sensing piston 6 has a larger displacement matching relationship when the first pressure diaphragm 7 is in the same change amount, the middle of the first pressure diaphragm 7 is arranged in an upward protruding manner, the downward displacement amount of the first pressure diaphragm 7 is larger, the thickness of the outer periphery of the first pressure diaphragm 7 is thicker than the middle thickness, the service life of the outer periphery which is deformed frequently is prolonged, a silica gel scraper 8 is fixedly connected to the lower surface of the buffer piston 5, and the silica gel scraper 8 is attached to the inner wall of the first pressure transferring cavity 101.
As shown in fig. 4 and 6, two sealing grooves are formed in the outer surface of the buffer piston 5, piston rings 51 are arranged in the two sealing grooves of the buffer piston 5, pressure differences are formed on two sides of the buffer piston 5 in the moving process, the piston rings 51 generate better sealing effect under the action of the pressure differences on two sides, the outer circumferential surface of the pressure sensing piston 6 is also provided with a sealing groove, a U-shaped sealing ring 61 is arranged in the sealing groove of the pressure sensing piston 6, two sides of the pressure sensing piston 6 are respectively in a hydraulic environment and a pneumatic environment, and the U-shaped sealing ring 61 deforms to have better sealing effect on liquid under the action of different gas-liquid pressure environments.
As shown in fig. 3 and 5, the pressure conversion transmission assembly includes a rotary pressure casing 9, a pressure conversion cavity is formed in the middle of the rotary pressure casing 9, the diameter of the pressure conversion cavity of the rotary pressure casing 9 is larger than that of a constant pressure cavity 31, two pressure transmission holes 91 are symmetrically formed in the upper portion of the rotary pressure casing 9, a second pressure diaphragm 10 is fixedly connected to the lower portion of the pressure conversion cavity of the rotary pressure casing 9, the thickness of the second pressure diaphragm 10 is gradually reduced from the middle to the periphery, a variable pressure piston 11 is slidably arranged in the rotary pressure casing 9, a plug rod is arranged on the variable pressure piston 11, the plug rod of the variable pressure piston 11 penetrates through the rotary pressure casing 9 and the sealing cover 3, the plug rod of the variable pressure piston 11 is in sliding fit with the pressure gauge 4, when the variable pressure piston 11 moves in the rotary pressure casing 9, the larger the diameter ratio of the pressure conversion cavity of the rotary pressure casing 9 and the constant pressure cavity 31 is, liquid is filled between the variable pressure piston 11 and the second pressure diaphragm 10 and the variable pressure piston 11.
The pressure buffer transmission component is used for sensing and matching the transmission of the pressure in the condenser and the first pressure-transferring cavity 101, when the pressure in the condenser is reduced, the pressure at the lower side of the buffer piston 5 is lower than the pressure at the upper side of the buffer piston 5, at the moment, the buffer piston 5 moves downwards, the pressure in the first pressure-transferring cavity 101 is reduced, when the pressure at the upper side of the buffer piston 5 is equal to the pressure at the lower side of the buffer piston, the movement is stopped, at the moment, the pressure in the first pressure-transferring cavity 101 is the same as the pressure in the condenser, when the pressure in the first pressure-transferring cavity 101 is changed, the pressure in the second pressure-transferring cavity 102 is changed together through the pressure pipeline 2, because the diameter of the pressure pipeline 2 is thinner, the speed of the gas passing through the pressure pipeline 2 is slower, so that when the pressure in the first pressure-transferring cavity 101 fluctuates, the buffer effect is generated by the gas passing through the pressure pipeline 2, and the pressure deviation exists between the upper side and lower side of the buffer piston 5 and the first pressure-transferring cavity 101 because the pressure is sealed through the piston ring 51, therefore, the pressure sensing piston 6 is matched with the first pressure diaphragm 7 to sense tiny pressure difference, the pressure sensing piston 6 and the first pressure diaphragm 7 move towards the low pressure side together to transfer smaller pressure deviation generated at two sides of the buffer piston 5 more accurately, when the buffer piston 5 moves, condensed water drops of steam in the first pressure transferring cavity 101 are scraped by the silica gel scraping plate 8, the hung water drops flow into the condenser downwards through the flow guide holes on the limiting ring 12, the temperature between the pressure sensing piston 6 and the first pressure diaphragm 7 is isolated from the condenser, meanwhile, the pressure is prevented from directly acting on the first pressure diaphragm 7, the periphery of the first pressure diaphragm 7 is thickened, the service life of the periphery of the buffer piston which is often deformed is prolonged, the deformation of the first pressure diaphragm 7 enables the pressure sensing piston 6 to have more buffer movement space, the range of the pressure sensing piston 6 matched with the first pressure diaphragm 7 for sensing the air pressure change is enlarged, and the balance of the pressure error is more accurate.
The pressure change in the second pressure transferring cavity 102 is sensed by the pressure transferring assembly, the pressure change in the second pressure transferring cavity 102 is transferred through the hydraulic change, then the pressure in the constant pressure cavity 31 is changed, after the pressure in the second pressure transferring cavity 102 is reduced, the pressure sensing of the second pressure diaphragm 10 is deformed, the middle thickening treatment concentrates the pressure sensing in the middle, the pressure bearing capacity of the second pressure diaphragm 10 is increased, the service life of the second pressure diaphragm is prolonged, the hydraulic change in the pressure transferring shell 9 drives the pressure changing piston 11 to move downwards, the pressure changing piston 11 extracts the gas in the constant pressure cavity 31 downwards through the pressure transferring hole 91, the gas enters the pressure converting cavity of the pressure transferring shell 9, the pressure in the constant pressure cavity 31 is the same as the pressure in the second pressure transferring cavity 102, the diameter of the constant pressure cavity 31 is smaller than the diameter of the pressure converting cavity of the pressure transferring shell 9, the pressure change and the moving distance of the pressure changing piston 11 are matched for control, the larger the diameter of the constant pressure cavity 31 is, the longer the moving distance of the pressure variable piston 11 is under the same pressure change, the dissipation of the pressure in the constant pressure cavity 31 is prevented under the liquid environment between the second pressure diaphragm 10 and the pressure variable piston 11, and the influence of the heat generated or released by the gas volume change in the pressure change process on the accuracy of pressure measurement is prevented under the buffering of the liquid pressure, the standard atmospheric pressure in the constant pressure cavity 31 is used as a reference, the measurement of the pressure variable gauge 4 is more accurate under the cooperation of the displacement variable standard of the pressure variable piston 11 and the pressure gauge 4, the moving distance of the buffer piston 5 is reduced to the moving displacement of the pressure variable piston 11 under the same pressure change, the air pressure value is measured by the cooperation of the displacement variable piston 11 and the pressure gauge 4, and compared with the tiny displacement of the sensing diaphragm of the traditional vacuum pressure gauge, the displacement variation of the pressure-variable piston 11 is larger, so that the accuracy will be improved and the measurement range will be increased by a proper amount.
Example 3
On the basis of embodiment 2, as shown in fig. 1, the cooling device further comprises a cooling shell 13, wherein the cooling shell 13 is fixedly installed on the outer side of the middle part of the pressure transmission shell 1, the pressure pipeline 2 is positioned in the cooling shell 13, a plurality of through holes are circumferentially formed in the middle part and the upper part of the cooling shell 13, and as hot air moves upwards, heat is radiated outwards through the through holes in the middle upper part of the cooling shell 13, and a fan 14 is arranged on the right part of the cooling shell 13.
Because pressure transmission casing 1 installs on the condenser, the inside operational environment temperature of condenser is higher, can cause the influence to the measuring environment of pressure measurement table 4, consequently, cool down to pressure transmission casing 1 through cooling casing 13, operating personnel starts fan 14 work, fan 14 is to cooling casing 13 interior drum gas, flowing gas takes away cooling cavity 103 hot gas through the intercommunicating pore, the steam upwards disperses and outwards gives off through cooling casing 13 middle part and upper portion's through-hole, the heat that the steam brought gives off to the external world from pressure transmission casing 1 middle part, prevent that the temperature from causing the influence to pressure measurement table 4's detection in the condenser.
Example 4
On the basis of embodiment 3, the device and the method for identifying, calculating and detecting the vacuum of the condenser of the power plant comprise the following steps:
step S1: after the device is arranged on a condenser, when the condenser is started, the interior of a condensing cavity of the condenser is firstly pumped into vacuum through a vacuum pump, a vacuum environment is caused by an exhaust port of a steam turbine, steam is condensed into water after entering the condenser, the vacuum degree in the condenser is guaranteed, when the condenser is pumped into vacuum, the vacuum pressure in the condenser drives a pressure buffering transmission assembly to move downwards, the pressure buffering transmission assembly enables the pressure in a first pressure-transmitting cavity 101 at the upper part of the pressure buffering transmission assembly to be reduced, the pressure in the first pressure-transmitting cavity 101 is transmitted to a second pressure-transmitting cavity 102 through a pressure pipeline 2, after the pressure conversion transmission assembly senses the pressure in the second pressure-transmitting cavity 102, the pressure in the constant pressure cavity 31 is changed, the pressure conversion transmission assembly is matched with a pressure measuring meter 4, the resistance of an inductor in the pressure measuring meter 4 is changed, and then an electronic circuit element detects the resistance change, and the converted output is displayed as a standard signal corresponding to the pressure and is transmitted to terminal equipment;
step S2: an operator controls devices such as a vacuum pump and the like through terminal equipment to change the vacuum degree in the condenser, after the vacuum degree reaches the standard, the steam turbine is controlled to start transmitting steam into the condenser, circulation work is started in the condenser, the pressure buffering transmission assembly always senses and keeps the pressure in the first pressure transmission cavity 101 and the pressure in the condenser identical, when the vacuum degree in the condenser changes, the pressure in the first pressure transmission cavity 101 and the pressure in the second pressure transmission cavity 102 are reduced, the pressure in the constant pressure cavity 31 also reduces after the transmission of the pressure conversion transmission assembly, the pressure conversion transmission assembly senses the air pressure change amount, the air pressure change amount is converted into displacement change in the vertical direction, the pressure meter 4 senses the displacement change amount of the pressure conversion transmission assembly, and shows that related air pressure values transmit signals to the terminal equipment, but when the vacuum degree is disqualified, the operator needs to change the vacuum degree in the condenser through starting other devices;
step S3: because the temperature is higher in the condenser, operating personnel start fan 14 work in the course of the work, through fan 14 to cooling shell 13 in the air-blast, flow the air and take away the hot gas in the cooling cavity 103 through the intercommunicating pore, and then make the heat that the steam brought distribute to the external world from pressure transmission shell 1 middle part, make pressure measurement table 4 guarantee the normal measuring to the vacuum pressure in the condenser.
While the invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.
Claims (7)
1. The utility model provides a power plant's condenser vacuum discernment calculates detection device which characterized in that: including pressure transmission casing (1), pressure transmission casing (1) passes through the flange to be installed on the condenser casing, pressure transmission casing (1) lower part is provided with first pressure chamber (101) that passes, pressure transmission casing (1) upper portion is provided with second pressure chamber (102), pressure transmission casing (1) middle part is provided with cooling cavity (103), cooling cavity (103) are through a plurality of intercommunicating pore and external intercommunication, pressure transmission casing (1) middle part circumference is provided with a plurality of pressure pipe (2), a plurality of pressure pipe (2) all are used for communicating first pressure chamber (101) and second pressure chamber (102), a plurality of pressure pipe (2) are aligned with a plurality of intercommunicating pore of cooling cavity (103) respectively, pressure transmission casing (1) upper portion is provided with closing cap (3), fixed pressure cavity (31) have been seted up to closing cap (3) lower part, initial pressure environment is standard atmospheric pressure in fixed pressure cavity (31), pressure transmission casing (1) and closing cap (3) top are provided with pressure measurement table (4), pressure measurement table (4) are connected with terminal equipment through the thing networking, pressure transmission casing (1) is provided with pressure sensing assembly and pressure transmission assembly is arranged in the pressure transmission buffer assembly, pressure transmission assembly is used for the pressure transmission assembly is located in the pressure transmission casing (101, the upper part in the pressure transmission shell (1) is provided with a pressure conversion transmission component, the pressure conversion transmission component penetrates through the sealing cover (3) to be matched with the pressure measurement meter (4), the pressure buffering transmission component is driven by the pressure in the condenser to change the pressure in the second pressure transmission cavity (102), the pressure conversion transmission component converts the air pressure in the second pressure transmission cavity (102) into hydraulic transmission, the internal hydraulic cooperation changes the pressure in the constant pressure cavity (31), the pressure conversion transmission component and the pressure measurement meter (4) are matched to perform displacement change, the pressure measurement meter (4) senses displacement change, a standard signal corresponding to the pressure is displayed and transmitted to terminal equipment, and the lower end in the pressure transmission shell (1) is fixedly connected with a limiting ring (12);
the pressure buffering transmission assembly comprises a buffering piston (5), the buffering piston (5) is arranged in a first pressure-transferring cavity (101) in a sliding mode, a limiting cavity is formed in the middle of the buffering piston (5), a pressure sensing piston (6) is arranged in the limiting cavity of the buffering piston (5) in a sliding mode, a first pressure diaphragm (7) is fixedly connected to the upper portion of the limiting cavity of the buffering piston (5), liquid is arranged in a cavity between the pressure sensing piston (6) and the first pressure diaphragm (7), a silica gel scraping plate (8) is fixedly connected to the lower surface of the buffering piston (5), and the outer ring of the silica gel scraping plate (8) is attached to the inner wall of the first pressure-transferring cavity (101);
the pressure conversion transmission assembly comprises a pressure conversion shell (9), a pressure conversion cavity is formed in the middle of the pressure conversion shell (9), two pressure transmission holes (91) are symmetrically formed in the left and right of the upper part of the pressure conversion shell (9), a second pressure diaphragm (10) is fixedly connected to the lower part of the pressure conversion cavity of the pressure conversion shell (9), a pressure conversion piston (11) is slidably arranged in the pressure conversion shell (9), a plug rod is arranged on the pressure conversion piston (11), the plug rod of the pressure conversion piston (11) penetrates through the pressure conversion shell (9) and the sealing cover (3), the plug rod of the pressure conversion piston (11) is in sliding fit with the pressure measuring meter (4), and liquid is arranged between the pressure conversion piston (11) and the second pressure diaphragm (10);
still including cooling casing (13), cooling casing (13) fixed mounting is in pressure transmission casing (1) middle part outside, and pressure pipe (2) are located cooling casing (13), and a plurality of through-hole has all been seted up to the middle part and the upper portion circumference of cooling casing (13), and the right part of cooling casing (13) is provided with fan (14).
2. The power plant condenser vacuum recognition, calculation and detection device as claimed in claim 1, wherein: the constant pressure cavity (31) is internally provided with an inert gas environment, the limiting ring (12) is circumferentially provided with a plurality of diversion holes, and the limiting ring (12) is used for limiting the downward limit position of the pressure buffer transmission assembly.
3. The power plant condenser vacuum recognition, calculation and detection device as claimed in claim 1, wherein: two sealing grooves are formed in the outer surface of the buffer piston (5), piston rings (51) are arranged in the two sealing grooves of the buffer piston (5), sealing grooves are also formed in the outer peripheral surface of the pressure sensing piston (6), and U-shaped sealing rings (61) are arranged in the sealing grooves of the pressure sensing piston (6).
4. The power plant condenser vacuum recognition, calculation and detection device as claimed in claim 1, wherein: the middle part of the first pressure diaphragm (7) protrudes upwards, the thickness of the outer periphery of the first pressure diaphragm (7) is thicker than that of the middle part of the first pressure diaphragm, and the space between the pressure sensing piston (6) and the first pressure diaphragm (7) is filled with liquid which does not deform.
5. The power plant condenser vacuum recognition, calculation and detection device as claimed in claim 1, wherein: the diameter of the constant pressure cavity (31) is smaller than the diameter of the pressure conversion cavity of the rotary pressure shell (9).
6. The power plant condenser vacuum recognition, calculation and detection device as claimed in claim 1, wherein: the thickness of the second pressure diaphragm (10) gradually decreases from the middle to the outer periphery, and the space between the second pressure diaphragm (10) and the pressure-variable piston (11) is also filled with liquid which does not deform.
7. The method for detecting the vacuum recognition calculation detection device of the condenser of the power plant according to any one of claims 1 to 6, wherein: the method comprises the following steps:
step S1: after the device is arranged on a condenser, when the condenser is started, the interior of a condensing cavity of the condenser is firstly pumped into vacuum through a vacuum pump, a vacuum environment is caused by an exhaust port of a steam turbine, steam is condensed into water after entering the condenser, the vacuum degree in the condenser is guaranteed, when the condenser is pumped into vacuum, the vacuum pressure in the condenser drives a pressure buffering transmission assembly to move downwards, the pressure buffering transmission assembly enables the pressure in a first pressure-transmitting cavity (101) at the upper part of the pressure buffering transmission assembly to be reduced, the pressure in the first pressure-transmitting cavity (101) is transmitted to a second pressure-transmitting cavity (102) through a pressure pipeline (2), the pressure conversion transmission assembly senses the pressure in the second pressure-transmitting cavity (102), the pressure in a constant pressure cavity (31) is changed, the pressure conversion transmission assembly is matched with a pressure measuring meter (4), the resistance of the sensor in the pressure measuring meter (4) is changed, and then an electronic circuit element detects the resistance change, and the pressure is converted and output into a standard signal display of corresponding pressure and is transmitted to terminal equipment;
step S2: an operator controls a vacuum pump through terminal equipment to change the vacuum degree in the condenser, after the vacuum degree reaches the standard, a steam turbine is controlled to start transmitting steam into the condenser, circulation work is started in the condenser, a pressure buffering transmission assembly always senses and keeps the pressure in a first pressure transmission cavity (101) identical to the pressure in the condenser, when the vacuum degree in the condenser changes, the pressure buffering transmission assembly moves upwards, the pressure in the first pressure transmission cavity (101) and the pressure in a second pressure transmission cavity (102) are reduced, the pressure in a constant pressure cavity (31) is also reduced after the pressure is transmitted through a pressure conversion transmission assembly, the pressure conversion transmission assembly senses the air pressure variable quantity, the air pressure variable quantity is converted into displacement change in the vertical direction, a pressure measuring meter (4) senses the displacement variable quantity of the pressure conversion transmission assembly, and shows that related air pressure values transmit signals to the terminal equipment, but when the vacuum degree is unqualified, the operator needs to change the vacuum degree in the condenser through starting other devices;
step S3: because the temperature is higher in the condenser, operating personnel start fan (14) work in the course of the work, through fan (14) to cooling shell (13) in the air-blast, flow the air and take away the hot gas in cooling cavity (103) through the intercommunicating pore, and then make the heat that the steam brought distribute to the external world from pressure transmission shell (1) middle part, make pressure gauge (4) guarantee the normal measuring to the vacuum pressure in the condenser.
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