CN110207900B - Method for detecting expansion of heat conduction copper pipe in fan coil - Google Patents
Method for detecting expansion of heat conduction copper pipe in fan coil Download PDFInfo
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- CN110207900B CN110207900B CN201910522813.XA CN201910522813A CN110207900B CN 110207900 B CN110207900 B CN 110207900B CN 201910522813 A CN201910522813 A CN 201910522813A CN 110207900 B CN110207900 B CN 110207900B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0025—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings of elongated objects, e.g. pipes, masts, towers or railways
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
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Abstract
The invention provides a method for detecting the expansion of a heat conduction copper pipe in a fan coil, which is characterized in that the fan coil is placed on a detection table, the heat conduction copper pipe is sealed by using an exhaust valve, the heat conduction copper pipe after expansion is sealed and pressure resistance detection is carried out by adopting a mode of pressing water into the sealed heat conduction copper pipe by using an electric pressure test pump, if the heat conduction copper pipe is poor in sealing, water can quickly flow out of the heat conduction copper pipe, the phenomenon is obvious, no other interference exists, the detection speed is high, and the efficiency is high.
Description
Technical Field
The invention relates to the field of pipeline detection, in particular to a method for detecting expansion of a heat conduction copper pipe in a fan coil.
Background
When the heat conduction copper pipe in the fan coil is inserted on the aluminum fin, a gap is inevitably left between the jacks on the heat conduction copper pipe and the aluminum fin, so that the heat conduction copper pipe needs to be expanded after the heat conduction copper pipe is installed, the jacks on the heat conduction copper pipe and the aluminum fin are fastened together, the performance of a heat conduction pipeline after expansion is changed to a certain extent, and a worker is required to detect the tightness and the pressure resistance of the heat conduction copper pipe.
Under the condition of the prior art, one end of a heat conduction copper pipe is usually sealed, high-pressure nitrogen is introduced into the other end of the heat conduction copper pipe, the heat conduction copper pipe and an aluminum fin are placed into a water tank together, and the joint of the heat conduction copper pipe is good in sealing and pressure resistance without bubbles. When putting into the water tank with heat conduction copper pipe and aluminium fin together, because the structure in the many gaps of copper pipe aluminium fin leads to being attached to certain bubble on the copper pipe, influences the accuracy that detects, when chronic gas leakage appears in heat conduction copper pipe moreover, the detection efficiency of this kind of detection method can be very low.
Disclosure of Invention
In order to solve the technical problem, the invention provides a method for detecting the expansion of a heat conducting copper pipe in a fan coil.
A method for detecting tube expansion of a heat conduction copper tube in a fan coil comprises the following steps:
step S1: one end of a heat conduction copper pipe in the fan coil is hermetically connected with a water outlet pipe of the electric pressure test pump, the other end of the heat conduction copper pipe in the fan coil is hermetically connected with an exhaust valve, and one end of the heat conduction copper pipe where the exhaust valve is located is arranged above the other end;
step S2: adding water into a water tank of the electric pressure test pump;
step S3: opening the exhaust valve, and injecting water into a heat conduction copper pipe in the fan coil by using the electric pressure test pump until water uniformly and continuously flows out of the exhaust valve;
step S4: closing the exhaust valve, gradually increasing the output pressure of the electric pressure test pump to 1.55-1.65 MPa with 50KPa as a basic unit, stopping pressurizing when the heat conduction copper pipe in the fan coil pipe leaks in the process, continuously outputting the target pressure by the electric pressure test pump for 1-2 min after the first target pressure is reached, and checking whether the heat conduction copper pipe leaks;
step S5: gradually increasing the output pressure of the electric pressure test pump to 1.75-1.85 MPa by taking 10KPa as a basic unit, after the pressure intensity is higher, increasing the pressure intensity less each time, avoiding pipe explosion caused by over-quick pressure intensity simultaneous sound, stopping pressurization when the heat conduction copper pipe in the fan coil pipe leaks water in the process, after the second target pressure is reached, continuously outputting the target pressure by the electric pressure test pump for 5-7 min, and checking whether the heat conduction copper pipe leaks water or not;
step S6: adjusting the pressure output of an electric pressure test pump to 0, taking down an exhaust valve, separating the electric pressure test pump from a heat conduction copper pipe, drying water in the heat conduction copper pipe by using an air gun, separately placing the water leaking fan coil and the water leaking fan coil in the steps S4 and S5, checking the water leaking fan coil, checking whether the heat conduction copper pipe in the fan coil deforms or not, and separately placing the deformed fan coil and the non-deformed fan coil.
Preferably, the exhaust valve of steps S1, S3-S6 includes a valve body, the valve body is hexagonal prism-shaped, one end of the valve body is a threaded joint, the valve body is provided with a valve body cavity along the length direction, a plug is arranged in the valve body cavity, a cavity is arranged in the plug, a spring is fixed in the cavity, a sealing ball is fixed on the spring, the sealing ball abuts against a water outlet of the cavity, one end of the valve body is screwed with a push rod, one end of the push rod penetrating into the valve body penetrates through the water outlet and abuts against the sealing ball, the end of the push rod extending out of the valve body is fixed with a screw cap, one side of the valve body is provided with a water outlet pipe, the water outlet pipe is communicated with the water outlet, one side of the cavity is provided with a water inlet, the water inlet is right opposite to a communicating pipe on the side wall of the valve body, the communicating pipe and the water outlet pipe are arranged at the same side of the valve body, the other end of the communicating pipe is aligned with the plug on the opposite side of the water outlet.
Preferably, one end of the valve body into which the mandril penetrates is provided with a sealing rubber gasket.
Preferably, one side of the water outlet pipe facing the sealing ball is provided with an annular rubber gasket.
Preferably, the fan coil of the steps S1-S5 is placed on a detection table, the detection table comprises a base, a water tank is arranged at one end of the top of the base, a coaming is arranged at the other end of the base, an opening is formed in one side, facing the water tank, of the coaming, a protective net is arranged at the top of the coaming, a meshed revolving door is hinged to one side, facing the water tank, of the protective net, a handle is arranged on the revolving door, a buckle is arranged on the edge of the revolving door, the buckle is connected with the edge of the protective net, a gas compressor is placed beside the base, and the gas compressor is communicated with a gas gun through a gas pipe.
Preferably, one side of the base is provided with a hanging rod, the air gun is provided with a hanging ring, and the hanging ring is hung on the hanging rod.
Compared with the prior art, the method for detecting the expansion of the heat conduction copper pipe in the fan coil provided by the invention has the following beneficial effects:
the method for detecting the expansion of the heat conduction copper pipe in the fan coil adopts a mode that an electric pressure test pump presses water into a sealed pipeline to detect the sealing and pressure resistance of the heat conduction copper pipe after expansion, if the heat conduction copper pipe is poor in sealing, water can quickly flow out of the heat conduction copper pipe, the phenomenon is obvious, other interferences do not exist, the detection speed is high, and the efficiency is high.
In addition, when the electric pressure test pump injects water into the heat conduction copper pipe for exhausting, the communicating pipe is arranged on the side wall of the valve body, the communicating pipe is arranged above the valve body according to the marked position during connection, and when water is injected, the heat conduction copper pipe is gradually filled with water, and then the water enters the plug from the communicating pipe, so that the exhaust is thorough, and the pressure supply of the electric pressure test pump cannot be influenced. Place fan coil the bounding wall the protection network and in the space that the revolving door encloses, because the copper pipe is too big at the expand tube in-process damage, the bearing capacity is weak, and the pipe explosion takes place for the in-process of electric pressure testing pump supply pressure, bounding wall, protection network and the revolving door can block the pipe explosion sputtering object, avoids injuring the staff, the bounding wall can shelter from the water that blows off when the air gun blows heat conduction copper pipe normal water, and water follows the opening flows and enters into in the basin, concentrate water, avoids the water that blows off to spatter in disorder, makes the people slide easily, the air gun articulate on the peg, makes things convenient for the staff to use.
Drawings
FIG. 1 is a main flow chart of a method for detecting tube expansion of a copper heat conducting tube in a fan coil provided by the invention;
FIG. 2 is a schematic cross-sectional view of the exhaust valve shown in FIG. 1;
FIG. 3 is a schematic structural view of a test stand for holding a fan coil.
Reference numbers in the figures: 1. the water-saving valve comprises a valve body, 2, a screw cap, 3, a communicating pipe, 4, a rubber gasket, 5, a sealing rubber gasket, 6, a mandril, 7, a water outlet pipe, 8, a sealing ball, 9, a spring, 10, a plug, 11, a rubber ring, 12, a fastening bolt, 13, a threaded joint, 14, a protective screen, 15, a revolving door, 16, a coaming, 17, a water tank, 18, a base, 19, a gas compressor, 20, a gas gun, 21 and an opening.
Detailed Description
The invention is further described with reference to the following figures and embodiments.
Referring to fig. 1, fig. 2 and fig. 3, fig. 1 is a main flowchart of a method for detecting an expansion of a copper pipe in a fan coil according to the present invention; FIG. 2 is a schematic cross-sectional view of the exhaust valve shown in FIG. 1; FIG. 3 is a schematic structural view of a test stand for holding a fan coil.
A method for detecting tube expansion of a heat conduction copper tube in a fan coil comprises the following steps:
the fan coil is placed on detecting the platform, and is concrete, it includes base 18 to detect the platform, the top one end of base 18 is provided with basin 17, the other end of base 18 is provided with bounding wall 16, the bounding wall 16 orientation one side of basin 17 is provided with opening 21, the top of bounding wall 16 is provided with protection network 14, protection network 14 orientation one side of basin 17 articulates there is netted revolving door 15, be provided with the handle on the revolving door 15, be provided with the buckle on the revolving door 15 edge, the buckle is connected the edge of protection network 14, compressor 19 has been placed by base 18, compressor 19 has air gun 20 through the trachea intercommunication, one side of base 18 is provided with the peg, be provided with the link on the air gun 20, the link articulates on the peg. The turning door 15 is opened to place a grading coil in the space enclosed by the protective net 14 and the enclosure 16. An electric pressure test pump is placed beside the base 18.
Step S1: one end of a heat conduction copper pipe in a fan coil is connected with a water outlet pipe of an electric pressure test pump in a sealing mode, the other end of the heat conduction copper pipe in the fan coil is connected with an exhaust valve in a sealing mode, specifically, the exhaust valve comprises a valve body 1, the valve body 1 is in a hexagonal prism shape and is convenient to clamp by a wrench, the valve body 1 is conveniently fixed at the position of the heat conduction copper pipe by the wrench, a valve body cavity is arranged in the length direction of the valve body 1 and is in two sections of cavities with larger calibers and smaller calibers, a plug 10 is arranged in the valve body cavity, the diameter of the plug 10 is equal to the diameter of the cavity with the smaller calibers, a snap ring with the diameter equal to the diameter of the cavity with the larger calibers of the valve body cavity is arranged on the plug 10, the snap ring is clamped at the boundary of the two sections of cavities, a rubber ring 11 is arranged on one side of the snap ring, and a fastening bolt 12 penetrates through the snap ring and is in threaded connection with the rubber ring 11 at the joint of the two sections of the cavities, a cavity is arranged in the plug 10, a spring 9 is fixed in the cavity, a sealing ball 8 is fixed on the spring 9, the sealing ball 8 abuts against a water outlet of the cavity, an annular rubber gasket 4 is arranged on one side of the water outlet pipe facing the sealing ball 8, the rubber gasket 4 ensures the sealing property between the sealing ball 8 and the water outlet, when the sealing ball abuts against the water outlet, the rubber gasket 4 is abutted, water cannot flow out from the space between the sealing ball 8 and the rubber gasket 4, one end of the valve body 1 is screwed with a mandril 6, one end of the valve body 1 into which the mandril 6 penetrates is provided with a sealing rubber gasket 5, the end part of the mandril 6 extending out of the valve body 1 is fixed with a screw cap 2, the setting of the screw cap 2 is convenient for rotating the mandril 6, and the sealing rubber gasket 5 ensures that water cannot flow out from the screwed part of the mandril 6 and the valve body 1, one end of the mandril 6 which penetrates into the valve body 1 penetrates through the water outlet and butts against the sealing ball 8, the sealing ball 8 can be ejected away from the rubber gasket 4 by rotating the ejector rod 6, one side of the valve body 1 is provided with a water outlet pipe 7, the water outlet pipe 7 is closely adjacent to the sealing rubber gasket 5, the water outlet pipe 7 is communicated with the water outlet, one side of the cavity is provided with a water inlet, the water inlet is over against the communicating pipe 3 on the side wall of the valve body 1, the other end of the communicating pipe 3 is aligned with the plug 10 on the opposite side of the water outlet, the outer side wall of the valve body 1 corresponds to the communicating pipe 3, the communicating pipe 3 and the water outlet pipe 7 are arranged on the same side of the valve body 1, the threaded connector 13 is screwed to a pipe orifice above a heat conducting copper pipe of the fan coil, and the air outlet pipe 7 is located above the exhaust valve during screwing.
Step S2: adding water into a water tank of the electric pressure test pump;
step S3: the exhaust valve is opened, the ejector rod 6 is rotated, the ejector rod 6 moves towards the valve body 1 and pushes the sealing ball 8 to leave the rubber gasket 4, so that the sealing ball 8 does not block the water outlet, the electric pressure test pump is utilized to inject water into the heat conduction copper pipe in the fan coil, the heat conduction copper pipe is gradually filled to the bottom of water flow, the air outlet pipe 7 is positioned above the air outlet pipe and marks that the communicating pipe 3 is positioned above the air outlet pipe, the communicating pipe 3 is arranged on the side wall of the valve body 1, during water injection, the heat conduction copper pipe and the valve body cavity on one side of the threaded connector are filled with water, then the water flows into the plug 10 from the communicating pipe and fills the plug 10 and the cavity with smaller caliber and flows out from the air outlet pipe 7, namely, when water flows out uniformly and continuously until the water flows out, no gas exists in the heat conduction copper pipe, when the pressure of the electric pressure test pump is provided for the heat conduction copper pipe, the influence of gas on the pressure provided by the electric pressure test pump is avoided, and the difference between the actual pressure and the display pressure of the electric pressure test pump is caused due to the pressure in the copper pipe.
Step S4: closing the exhaust valve, reversely rotating the ejector rod 6 to enable the ejector rod 6 to move towards the outside of the valve body 1, separating the ejector rod 6 from the sealing ball 8, enabling the sealing ball 8 to abut against the rubber gasket 4 under the action of the spring 9, gradually increasing the output pressure of the electric pressure test pump to 1.55-1.65 MPa by taking 50KPa as a basic unit, stopping pressurization when the heat conduction copper pipe in the fan coil pipe leaks water in the process, and after the first target pressure is reached, continuously outputting the target pressure for 1-2 min by the electric pressure test pump to check whether the heat conduction copper pipe leaks water or not;
step S5: gradually increasing the output pressure of the electric pressure test pump to 1.75-1.85 MPa by taking 10KPa as a basic unit, stopping pressurizing when the heat conduction copper pipe in the fan coil pipe leaks in the process, continuously outputting the target pressure by the electric pressure test pump for 5-7 min after the second target pressure is reached, and checking whether the heat conduction copper pipe leaks water or not;
step S6: adjusting the pressure output of an electric pressure test pump to 0, taking down an exhaust valve, separating the electric pressure test pump from a heat conduction copper pipe, drying water in the heat conduction copper pipe by using an air gun, blowing the water from top to bottom by using the air gun which extends to the pipe orifice of the heat conduction copper pipe positioned above during blowing, separately placing a fan coil which leaks water after the steps S4 and S5 and a non-leaking fan coil, checking the non-leaking fan coil, and seeing whether the heat conduction copper pipe in the fan coil deforms or not, and separately placing the deformed fan coil and the non-deforming fan coil.
The method for detecting the expansion of the heat conduction copper pipe in the fan coil adopts a mode that an electric pressure test pump presses water into a sealed pipeline to detect the sealing and pressure resistance of the heat conduction copper pipe after expansion, if the heat conduction copper pipe is poor in sealing, water can quickly flow out of the heat conduction copper pipe, the phenomenon is obvious, other interferences do not exist, the detection speed is high, and the efficiency is high.
In addition, when the electric pressure test pump injects water into the heat conduction copper pipe for exhausting, because the communication pipe 3 is arranged on the side wall of the valve body 1, the communication pipe 3 is arranged above according to the marked position during connection, when water is injected, the heat conduction copper pipe is gradually filled with water, and then the water enters the plug 10 from the communication pipe 3, so that the exhaust is thorough, and the pressure provided by the electric pressure test pump is not influenced. Place fan coil the bounding wall 16 in the protection network 14 and in the space that revolving door 15 encloses, because the copper pipe is too big at the expand tube in-process damage, the bearing capacity is weak, and the pipe explosion takes place for the in-process of electric pressure test pump supply pressure, bounding wall 16, protection network 14 and revolving door 15 can block the pipe explosion sputtering object, avoids injuring the staff, bounding wall 16 can shelter from the water that blows off when air gun 20 blows heat conduction copper pipe normal water, and water follows opening 21 flows and enters into in the basin 17, concentrate water, avoids the water that blows off to spatter in disorder, makes the people slide easily, air gun 20 articulates on the peg, makes things convenient for the staff to use.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (1)
1. A method for detecting tube expansion of a heat conduction copper tube in a fan coil is characterized by comprising the following steps:
step S1: one end of a heat conducting copper pipe in a fan coil is hermetically connected with a water outlet pipe of an electric pressure test pump, the other end of the heat conducting copper pipe in the fan coil is hermetically connected with an exhaust valve, the exhaust valve comprises a valve body, the valve body is in a hexagonal prism shape, a valve body cavity is arranged along the length direction of the valve body, the valve body cavity is in two sections of cavities with larger and smaller calibers, a plug is arranged in the valve body cavity, the diameter of the plug is equal to the diameter of the cavity with the smaller calibers, a snap ring with the diameter equal to the diameter of the cavity with the larger calibers of the valve body is arranged on the plug, the snap ring is clamped at the dividing position of the two sections of cavities, a rubber ring is arranged on one side of the snap ring, a fastening bolt penetrates through the snap ring and is screwed at the connecting position of the two sections of cavities, a cavity is arranged in the plug, a spring is fixed in the cavity, and a sealing ball is fixed on the spring, the sealing ball props against a water outlet of the cavity, one side of the water outlet pipe, which faces the sealing ball, is provided with an annular rubber gasket, when the sealing ball props against the rubber gasket, one end of the valve body is screwed with a push rod, one end of the valve body into which the push rod penetrates is provided with a sealing rubber gasket, the end part of the push rod, which extends out of the valve body, is fixed with a screw cap, one end of the valve body into which the push rod penetrates passes through the water outlet and props against the sealing ball, the sealing ball can be pushed away from the rubber gasket by rotating the push rod, one side of the valve body is provided with a water outlet pipe, the water outlet pipe is close to the sealing rubber gasket, the water outlet pipe is communicated with the water outlet, one side of the cavity is provided with a water inlet, the water inlet is just opposite to the communicating pipe on the side wall of the valve body, and the other end of the communicating pipe is aligned with the plug opposite to the water outlet, the outer side wall of the valve body corresponds to the communicating pipe, the communicating pipe and the water outlet pipe are arranged on the same side of the valve body, the threaded joint is in threaded connection with an upper pipe orifice in a heat conducting copper pipe of the fan coil, and the air outlet pipe is located above the exhaust valve during threaded connection;
step S2: adding water into a water tank of the electric pressure test pump;
step S3: the exhaust valve is opened, the ejector rod is rotated, the ejector rod moves towards the valve body and pushes the sealing ball to leave the rubber gasket, so that the sealing ball does not block the water outlet, the electric pressure test pump is used for injecting water into a heat conduction copper pipe in a fan coil, the heat conduction copper pipe is gradually filled to the bottom of water flow, when the exhaust valve is connected, the air outlet pipe is positioned above and marks that the communicating pipe is positioned above, the communicating pipe is arranged on the side wall of the valve body, when water is injected, the heat conduction copper pipe and a valve body cavity on one side of the threaded connector are filled with water, then the water flows into the plug from the communicating pipe, the plug and a cavity with a smaller caliber are filled with the water, and then the water flows out from the air outlet pipe;
step S4: closing the exhaust valve, reversely rotating the ejector rod to enable the ejector rod to move towards the outside of the valve body, separating the ejector rod from the sealing ball, enabling the sealing ball to abut against the rubber gasket under the action of the spring, gradually increasing the output pressure of the electric pressure test pump to 1.55-1.65 MPa with 50KPa as a basic unit, stopping pressurization when water leakage occurs in a heat conduction copper pipe in the fan coil pipe in the process, continuously outputting the target pressure for 1-2 min by the electric pressure test pump after the first target pressure is reached, and checking whether the heat conduction copper pipe leaks water;
step S5: gradually increasing the output pressure of the electric pressure test pump to 1.75-1.85 MPa by taking 10KPa as a basic unit, stopping pressurizing when the heat conduction copper pipe in the fan coil pipe leaks in the pressurizing process, continuously outputting the target pressure by the electric pressure test pump for 5-7 min until reaching a second target pressure, and checking whether the heat conduction copper pipe leaks;
step S6: adjusting the pressure output of an electric pressure test pump to 0, taking down an exhaust valve, separating the electric pressure test pump from a heat conduction copper pipe, drying water in the heat conduction copper pipe by using an air gun, blowing the water from top to bottom from a pipe orifice extending to the heat conduction copper pipe above the air gun during blowing, separately placing a water leakage fan coil and a water leakage fan coil after the steps S4 and S5, checking the water leakage fan coil, and seeing whether the heat conduction copper pipe in the fan coil is deformed or not, and separately placing the deformed fan coil and the non-deformed fan coil;
the fan coil of steps S1-S5 is placed on a detection table, the detection table comprises a base, a water tank is arranged at one end of the top of the base, a surrounding plate is arranged at the other end of the base, an opening is formed in the surrounding plate and faces one side of the water tank, a protective net is arranged at the top of the surrounding plate, a meshed revolving door is hinged to one side, facing the water tank, of the protective net, a handle is arranged on the revolving door, a buckle is arranged on the edge of the revolving door and connected with the edge of the protective net, a gas compressor is placed beside the base and communicated with a gas gun through a gas pipe, a hanging rod is arranged on one side of the base, and a hanging ring is arranged on the gas gun and is hung on the hanging rod.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910522813.XA CN110207900B (en) | 2019-06-17 | 2019-06-17 | Method for detecting expansion of heat conduction copper pipe in fan coil |
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| CN201910522813.XA CN110207900B (en) | 2019-06-17 | 2019-06-17 | Method for detecting expansion of heat conduction copper pipe in fan coil |
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| CN110207900B true CN110207900B (en) | 2021-08-13 |
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| CN108195527A (en) * | 2018-01-02 | 2018-06-22 | 浙江大学 | Used in nuclear power station high density polyethylene pipe tightness is tested and evaluation method |
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2019
- 2019-06-17 CN CN201910522813.XA patent/CN110207900B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2653255Y (en) * | 2003-09-30 | 2004-11-03 | 李财荣 | Solar water heater safety valve |
| CN103234833A (en) * | 2013-05-06 | 2013-08-07 | 西安海联石化科技有限公司 | Equipment and device for hydraulic pressure test of rear metal pipe |
| CN203978555U (en) * | 2014-06-24 | 2014-12-03 | 罗剑 | A kind of engine sump tank oil discharging valve |
| CN106969983A (en) * | 2017-05-09 | 2017-07-21 | 绍兴市容纳测控技术有限公司 | A kind of Demolition Tester of Tubing Pressure Resistance |
| CN107436261A (en) * | 2017-07-03 | 2017-12-05 | 中国水利水电第十工程局有限公司 | A kind of PCCP hydraulic test of pipeline method |
| CN108195527A (en) * | 2018-01-02 | 2018-06-22 | 浙江大学 | Used in nuclear power station high density polyethylene pipe tightness is tested and evaluation method |
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| CN110207900A (en) | 2019-09-06 |
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