CN104062076B - A kind of heat pump-unit cooler fills nitrogen pressurize leak detection equipment and control method thereof - Google Patents
A kind of heat pump-unit cooler fills nitrogen pressurize leak detection equipment and control method thereof Download PDFInfo
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Abstract
A kind of heat pump-unit cooler fills nitrogen pressurize leak detection equipment and control method thereof, relating to is quality examination and the control device of the compression machine of refrigeration agent, device or system for low-boiling point gas, comprises high pressure gas holder, constant voltage gas tank, vacuum pump, expansion gas tank and control device; Fill nitrogen pipeline comprise be connected in series fill nitrogen check valve, fill nitrogen magnetic valve and fill nitrogen rapid-acting coupling, pipeline is provided with the first pressure detecting element; High pressure tonifying Qi pipeline comprises tonifying Qi magnetic valve, and high pressure gas holder is provided with the 3rd pressure detecting element; Vacuum-pumping pipeline comprises the rapid-acting coupling of bleeding being connected in series, bleed magnetic valve and check valve of bleeding, and pipeline is provided with the 2nd pressure detecting element; Utilize constant pressure valve make-up gas to constant voltage gas tank, by constant voltage gas tank central gas supply, ensure the stable of constant voltage gas tank pressure, the speed of inflation is fast, utilizing pressure detecting element detection control inflation pressure, the pressure divergence of pressurize is little, can meet the needs of the modern flexible production line of short run multi items.
Description
Technical field
The present invention relates to is quality examination and the control device of the compression machine of refrigeration agent, device or system for low-boiling point gas, particularly relates to and a kind of fills nitrogen pressurize leak detection equipment and control method thereof for heat pump-unit cooler.
Background technology
In the production process of heat pump and refrigeration system, leak detection must be carried out, to guarantee its quality, owing to the temperature of liquid nitrogen is low, produce easily, and cost is low, pollution-free, therefore, a lot of enterprise is in the production process of heat pump and refrigeration system, it is all adopt to fill nitrogen pressurize leak detecting and heat pump-unit cooler hunted leak, leak detection after terminating directly by nitrogen discharge in ambient air, do not recycle, produce tens machines every day, a large amount of nitrogen is caused to waste, and nitrogen is directly emitted on around production line, although nitrogen itself is very little to the harm of human body, but when concentration raises, when causing that in air, oxygen concentration drops to below 19.5%, the environment of anoxic can be formed, produce smothering action, likely cause personal injury. meanwhile, major part enterprise uses multiple nitrogengas cylinder to fill pressurize, when the gaseous tension in bottle is lower than, when needing the pressure of pressurize, remaining nitrogen just cannot utilize. therefore, in the leak detection process of heat pump and refrigeration system, it is necessary to discharge and residue nitrogen are recycled, it is to increase the utilization ratio of nitrogen, avoid the wasting of resources.
Chinese invention patent application " a kind of refrigeration system fills nitrogen pressurize leak detection assembly and method " (application for a patent for invention number 201320455044.9, publication number CN103487214A) disclose a kind of refrigeration system and fill nitrogen pressurize leak detection assembly and method, after refrigeration system pressurize completes, nitrogen in its pipeline is filled in another refrigeration system to be hunted leak by nitrogen recycling pipeline, when the dwell pressure value in the refrigeration system hunted leak do not reach setting require time, it is filled with high pressure nitrogen again by filling nitrogen pipeline, until when the pressure in refrigeration system to be checked reaches the dwell pressure value of setting, stop filling nitrogen, refrigeration system to be checked is carried out pressurize. Chinese invention patent application " a kind of for the nitrogen gas recovering apparatus after refrigeration system pressurize leak detection and method " (application for a patent for invention number 201320456988.8, publication number CN103471776A) disclose a kind of for refrigeration system pressurize hunt leak after nitrogen gas recovering apparatus and method, after refrigeration system pressurize completes, nitrogen in its pipeline is put in another refrigeration system to be hunted leak by nitrogen recycling tubes rows, when oneself completes the pressure in the refrigeration system of leak detection lower than 0.1MPa, aspirator pump stopping work, complete the recovery of nitrogen, and pull down described flexible pipe.
Although the nitrogen that oneself can directly be completed in the refrigeration system of leak detection by above-mentioned prior art is filled in refrigeration system next to be checked, achieve the recycling to nitrogen after pressurize leak detection, avoid the waste of nitrogen, and while nitrogen recycling, directly the refrigeration system that the next one is to be checked can be carried out pressurize. but, in actual production process, product type on production line and batch are constantly changes, especially for the modern flexible production line of short run multi items, the system that the same period is to be hunted leak and the system that oneself completes to hunt leak often belong to different model or the product of different batch, therefore, oneself complete leak detection system discharge nitrogen amount with treat leak detection system fill the most of situation of nitrogen quantity under inequal, the above-mentioned nitrogen that oneself completes leak detection system discharge is transferred directly to the prior art treating leak detection system, it is difficult to realize effective nitrogen recycling and utilizes function.
Summary of the invention
It is an object of the invention to be provided a kind of heat pump-unit cooler to fill nitrogen pressurize leak detection equipment, it is possible to solve the technical problem filling nitrogen pressurize leak detection and nitrogen recycling of heat pump-unit cooler flexible production line.
The present invention solves the problems of the technologies described above the technical scheme adopted:
A kind of heat pump-unit cooler fills nitrogen pressurize leak detection equipment, nitrogen pressurize leak detection and nitrogen recycling is filled for heat pump or unit cooler production line, what described heat pump or unit cooler production line comprised the pressurization leakage detection workspace of holding unit to be detected and held unit to be vacuumized vacuumizes workspace, it is characterised in that:
The described nitrogen pressurize leak detection equipment that fills comprises high pressure gas holder, constant voltage gas tank, vacuum pump, expansion gas tank and nitrogengas cylinder, what m bar was connected to pressurization leakage detection workspace fills nitrogen pipeline, n bar is connected to the vacuum-pumping pipeline vacuumizing workspace, connects the high pressure tonifying Qi pipeline of high pressure gas holder and nitrogengas cylinder, and for controlling to fill the control device of nitrogen pressure and vacuum tightness; Wherein, m and n be greater than 1 positive integer, determine according to the throughput of heat pump or unit cooler production line;
Described fill nitrogen pipeline comprise be sequentially connected in series fill nitrogen check valve, fill nitrogen magnetic valve and fill nitrogen rapid-acting coupling; Nitrogen magnetic valve and the pipeline that fills between nitrogen rapid-acting coupling are provided with the first pressure detecting element filling; Respectively fill the inlet end filling nitrogen check valve of nitrogen pipeline, it is connected to constant voltage gas tank side by side; Enter the unit to be detected of pressurization leakage detection workspace, be connected respectively to respectively fill nitrogen pipeline fill nitrogen rapid-acting coupling, the nitrogen in constant voltage gas tank by respectively filling nitrogen pipeline, taking constant pressure as the unit automatic nitrogen-charging to be detected in pressurization leakage detection workspace;
High pressure gas holder is connected to constant voltage gas tank by constant pressure valve, by constant pressure valve to the automatic tonifying Qi of constant voltage gas tank, ensures constant voltage gas tank pressure-stabilisation when filling nitrogen; Expansion gas tank is connected to high pressure gas holder, and when the gas volume in high pressure gas holder reduces because leaking, the gas automatic makeup in expansion gas tank is charged in high pressure gas holder, thus ensures the nitrogen pressure in high pressure gas holder, it is possible to meet the requirement that constant pressure valve maintains constant pressure;
Described high pressure tonifying Qi pipeline comprises tonifying Qi magnetic valve, and high pressure gas holder is provided with the 3rd pressure detecting element, and the nitrogen in nitrogengas cylinder is charged in high pressure gas holder by tonifying Qi magnetic valve automatic makeup;
Described vacuum-pumping pipeline comprises the rapid-acting coupling of bleeding being sequentially connected in series, bleed magnetic valve and check valve of bleeding; Bleed magnetic valve and bleed between rapid-acting coupling pipeline on be provided with the 2nd pressure detecting element; The exit end of the check valve of bleeding of each vacuum-pumping pipeline, is connected to the air inlet end of vacuum pump side by side, and the exhaust side of vacuum pump is connected to high pressure gas holder; Complete pressurize leak detection and enter the unit to be vacuumized vacuumizing workspace, by each vacuum-pumping pipeline by the nitrogen recycling discharged in high pressure gas holder;
Described control device comprises and fills nitrogen control unit, bleed control unit and gas supply control unit; Fill nitrogen pipeline corresponding to each, fill nitrogen control unit and arrange one by filling nitrogen switch, the normally closed contact of the first pressure detecting element, and the power coil filling nitrogen magnetic valve be connected in series composition fill nitrogen controlling brancher; Corresponding to each vacuum-pumping pipeline, control unit of bleeding arranges a controlling brancher of bleeding; Described controlling brancher of bleeding comprises the switch of bleeding being sequentially connected in series, the power coil of the normally closed contact of the 2nd pressure detecting element and magnetic valve of bleeding, and is connected in the vacuum pump rly. at power coil two ends in parallel; Respectively fill nitrogen controlling brancher and controlling brancher of bleeding is connected in parallel between L and the N end of power supply; Gas supply control unit by tonifying Qi switch, the normally closed contact of the 3rd pressure detecting element, and the power coil of tonifying Qi magnetic valve is composed in series.
Heat pump-the unit cooler of the present invention fills the one preferably technical scheme of nitrogen pressurize leak detection equipment, it is characterized in that described high pressure gas holder is also connected with safety relief valve, when the nitrogen pressure reduction of high pressure gas holder and constant voltage gas tank exceeds the safety range that constant pressure valve maintains constant pressure, the nitrogen of high pressure gas holder is by safety relief valve releasing pressure automatically, thus ensure the nitrogen pressure in high pressure gas holder, it is possible to meet the requirement that constant pressure valve maintains constant pressure.
Heat pump-the unit cooler of the present invention fills a kind of better technical scheme of nitrogen pressurize leak detection equipment, it is characterized in that described vacuum pump is variable frequency control vacuum pump, the normally opened contact of vacuum pump rly. is connected to the control input end of frequency transformer, according to the unit quantity to be vacuumized that vacuum-pumping pipeline connects, automatically change the frequency of vacuum pump.
Another object of the present invention to be provided a kind of control method filling nitrogen pressurize leak detection equipment for heat pump-unit cooler, and the present invention solves the problems of the technologies described above the technical scheme adopted and is:
A kind of control method filling nitrogen pressurize leak detection equipment for above-mentioned heat pump-unit cooler, it is characterised in that comprise the following steps:
S100: the m entering pressurization leakage detection workspace is overlapped unit to be detected, respectively by respective fill that nitrogen rapid-acting coupling is connected to the m bar free time fill nitrogen pipeline;
S120: connect fill nitrogen controlling brancher fill nitrogen switch, open correspondence and fill nitrogen pipeline fills nitrogen magnetic valve, utilize constant voltage gas tank automatically to treat detection unit and carry out filling nitrogen;
S140: if the first pressure detecting element detects that filling nitrogen pressure reaches default pressurize value: the normally closed contact of the first pressure detecting element disconnects, automatically closes and fills nitrogen magnetic valve on corresponding pipeline; Filling nitrogen rapid-acting coupling by separation, what make this unit disengaging correspondence fills nitrogen pipeline, enters pressurize leak detection state;
S200: fill in nitrogen process at unit, high pressure gas holder to the automatic tonifying Qi of constant voltage gas tank, ensures constant voltage gas tank pressure-stabilisation when filling nitrogen by constant pressure valve; The aperture size of constant pressure valve becomes along with the pressure reduction increase between high pressure gas holder and constant voltage gas tank greatly, thus ensures that constant voltage gas tank is filling pressure-stabilisation in nitrogen process;
S220: utilize expansion gas tank to regulate the capacity of gas in high pressure gas holder, make the nitrogen pressure reduction scope that high pressure gas holder and constant voltage gas tank keep predetermined;
S240: the tonifying Qi switch connecting gas supply control unit, if the 3rd pressure detecting element detects that the pressure of high pressure gas holder is lower than minimum operating air pressure: the normally closed contact of the 3rd pressure detecting element closes, tonifying Qi magnetic valve is opened, nitrogen in nitrogengas cylinder adds in high pressure gas holder by tonifying Qi magnetic valve, makes high pressure gas holder and constant voltage gas tank be returned within the scope of predetermined pressure reduction;
S300: pressurize leak detection is terminated to send into the n vacuumizing workspace and overlaps unit to be vacuumized, be connected to the vacuum-pumping pipeline of n bar free time respectively by respective rapid-acting coupling of bleeding;
S320: the switch of bleeding connecting controlling brancher of bleeding, it is in the normally closed contact of the 2nd pressure detecting element of closed state, connect the magnetic valve of bleeding in corresponding vacuum-pumping pipeline, the normally opened contact of vacuum pump rly. closes, and starts vacuum pump by the gas suction high pressure gas holder in unit to be vacuumized;
S340: if the 2nd pressure detecting element detects that vacuum tightness reaches setting and requires: the normally closed contact of the 2nd pressure detecting element disconnects, and automatically closes the magnetic valve of bleeding in corresponding vacuum-pumping pipeline, and this unit vacuumizes end; By being separated rapid-acting coupling of bleeding, this unit is made to depart from corresponding vacuum-pumping pipeline;
S360: the unit being connected in vacuum-pumping pipeline if all vacuumizes end: the normally opened contact of all vacuum pump rly.s respectively bled in controlling brancher all disconnects, and automatically closes vacuum pump.
Heat pump-the unit cooler of the present invention fills a kind of preferred technical scheme of nitrogen pressurize leak detection apparatus control method, it is characterised in that the nitrogen pressure reduction scope of described high pressure gas holder and constant voltage gas tank is between 0.2MPa��0.4MPa.
Heat pump-the unit cooler of the present invention fills the one preferably technical scheme of the control method of nitrogen pressurize leak detection equipment, it is characterised in that also comprise the following steps after step S240:
S260: if the nitrogen pressure of high pressure gas holder exceedes the highest permission operating air pressure of high pressure gas holder: high pressure gas holder, by safety relief valve releasing pressure automatically, makes high pressure gas holder pressure lower than the highest permission operating air pressure.
Heat pump-the unit cooler of the present invention fills a kind of better technical scheme of nitrogen pressurize leak detection apparatus control method, it is characterised in that the highest permission operating air pressure of described high pressure gas holder equals the constant air pressure+0.6MPa of constant voltage gas tank.
Heat pump-the unit cooler of the present invention fills the technical scheme of a kind of improvement of the control method of nitrogen pressurize leak detection equipment, it is characterised in that described step S360 also comprises the action of following variable frequency control:
S361: the unit quantity to be vacuumized being currently connected to vacuum-pumping pipeline according to the condition adjudgement of the normally opened contact of vacuum pump rly.;
S362: according to the unit quantity to be vacuumized being connected to vacuum-pumping pipeline, changes the operating frequency of vacuum pump, to adapt to the needs that different quantities vacuumizes unit rate of air sucked in required.
The invention has the beneficial effects as follows:
1, the heat pump-unit cooler of the present invention fills nitrogen pressurize leak detection equipment and control method thereof, utilize constant pressure valve make-up gas to constant voltage gas tank, by constant voltage gas tank central gas supply, ensure the stable of constant voltage gas tank pressure, the speed of inflation is fast, utilizes pressure detecting element detection control inflation pressure, and the pressure divergence of pressurize is little, the existing pressurize leak detection pattern of gas cylinder inflation one by one can be replaced, meet the needs of the modern flexible production line of short run multi items.
2, heat pump-the unit cooler of the present invention fills nitrogen pressurize leak detection equipment and control method thereof, by a vacuum pump, multiple devices are vacuumized simultaneously, utilize pressure detecting element detection control vacuum tightness, gas in equipment is transferred in high pressure gas holder, to vacuumize and reasonably be brought together with gas recovery, by vacuum pump variable frequency control, adapt to the demand of different quantities vaccum-pumping equipment, both solved and when pressurize is hunted leak, nitrogen had all been reclaimed, avoid the technical problem of the waste of nitrogen, can greatly reduce again equipment cost and the running cost of product quality inspection.
3, the heat pump-unit cooler of the present invention fills nitrogen pressurize leak detection equipment and control method thereof, adopts expansion gas tank to regulate the amount of gas in high pressure gas holder, thus regulates the pressure of gas in gas tank. When the pressure of high pressure gas holder changes the regulation range exceeding expansion gas tank, by tonifying Qi magnetic valve and safety relief valve, carry out the adjustment of the gas volume in high pressure gas holder, utilize pressure detecting element to realize control automatically, rational in infrastructure, safety, convenient, saving production space.
Accompanying drawing explanation
Fig. 1 is the structural representation that the heat pump-unit cooler of the present invention fills nitrogen pressurize leak detection equipment;
Fig. 2 is the control device electrical schematic diagram that the heat pump-unit cooler of the present invention fills nitrogen pressurize leak detection equipment;
Fig. 3 is the control schema that the heat pump-unit cooler of the present invention fills nitrogen pressurize leak detection equipment.
The label of each parts in above figure: 100-fills nitrogen pressurize leak detection equipment, 110-high pressure gas holder, 120-constant voltage gas tank, 121-fills nitrogen check valve, 122-fills nitrogen magnetic valve, 123-fills nitrogen rapid-acting coupling, 130-vacuum pump, 131-bleeds check valve, 132--bleeds magnetic valve, 133-bleeds rapid-acting coupling, 111-constant pressure valve, 150-nitrogengas cylinder, 151-tonifying Qi magnetic valve, 140-expansion gas tank, 160-safety relief valve, 200-pressurization leakage detection workspace, 201��20m-unit to be detected, 300-vacuumizes workspace, 301��30n-unit to be vacuumized, 400-control device, 410-fills nitrogen control unit, 411-fills nitrogen switch, 412-first pressure detecting element, 420-bleeds control unit, 421-bleeds switch, 422-the 2nd pressure detecting element, 423-vacuum pump rly., 430-gas supply control unit, 431-tonifying Qi switch, 432-the 3rd pressure detecting element.
Embodiment
In order to the technique scheme of the present invention can be understood better, carry out describing in detail further below in conjunction with drawings and Examples.
The heat pump refrigerating unit of the present invention fills nitrogen pressurize leak detection equipment, nitrogen pressurize leak detection and nitrogen recycling is filled for heat pump or unit cooler production line, embodiment according to Fig. 1, described heat pump or unit cooler production line comprise hold that m overlaps the pressurization leakage detection workspace 200 of unit to be detected and hold that n overlaps unit to be vacuumized vacuumize workspace 300, the described nitrogen pressurize leak detection equipment 100 that fills comprises high pressure gas holder 110, constant voltage gas tank 120, vacuum pump 130, expansion gas tank 140 and nitrogengas cylinder 150, what m bar was connected to pressurization leakage detection workspace 200 fills nitrogen pipeline, n bar is connected to the vacuum-pumping pipeline vacuumizing workspace 300, connect the high pressure tonifying Qi pipeline of high pressure gas holder 110 and nitrogengas cylinder 150, and for controlling to fill the control device 400 of nitrogen pressure and vacuum tightness, wherein, m and n be greater than 1 positive integer, can determine according to the throughput of heat pump or unit cooler production line,
Described fill nitrogen pipeline comprise be sequentially connected in series fill nitrogen check valve 121, fill nitrogen magnetic valve 122 and fill nitrogen rapid-acting coupling 123; Nitrogen magnetic valve 122 and the pipeline that fills between nitrogen rapid-acting coupling 123 are provided with the first pressure detecting element 412 filling; Respectively fill the inlet end filling nitrogen check valve 121 of nitrogen pipeline, it is connected to constant voltage gas tank 120 side by side; Enter the unit 201��20m to be detected of pressurization leakage detection workspace 200, be connected respectively to respectively fill nitrogen pipeline fill nitrogen rapid-acting coupling 123, nitrogen in constant voltage gas tank 120 by respectively filling nitrogen pipeline, taking constant pressure simultaneously as the unit each to be detected 201��20m automatic nitrogen-charging in pressurization leakage detection workspace 200;
High pressure gas holder 110 is connected to constant voltage gas tank 120 by constant pressure valve 111, by constant pressure valve 111 to constant voltage gas tank 120 tonifying Qi automatically, ensures constant voltage gas tank pressure-stabilisation when filling nitrogen; Expansion gas tank 140 is connected to high pressure gas holder 110, when the gas volume in high pressure gas holder 110 reduces because leaking, gas automatic makeup in expansion gas tank 140 is charged in high pressure gas holder 110, thus ensures the nitrogen pressure in high pressure gas holder 110, it is possible to meet the requirement that constant pressure valve 111 maintains constant pressure;
Described high pressure tonifying Qi pipeline comprises tonifying Qi magnetic valve 151; High pressure gas holder 110 is provided with the 3rd pressure detecting element 432; Nitrogen in nitrogengas cylinder 150 is charged in high pressure gas holder 110 by tonifying Qi magnetic valve 151 automatic makeup;
Described vacuum-pumping pipeline comprises the rapid-acting coupling 133 of bleeding being sequentially connected in series, bleed magnetic valve 132 and check valve 131 of bleeding; Magnetic valve 132 and the pipeline bled between rapid-acting coupling 133 are provided with the 2nd pressure detecting element 422 bleeding; The exit end of the check valve 131 of bleeding of each vacuum-pumping pipeline, is connected to the air inlet end of vacuum pump 130 side by side, and the exhaust side of vacuum pump 130 is connected to high pressure gas holder 110; Complete pressurize leak detection and enter the unit 301��30n to be vacuumized vacuumizing workspace 300, by each vacuum-pumping pipeline by the nitrogen recycling discharged in high pressure gas holder 110;
Heat pump-the unit cooler of the present invention fill nitrogen pressurize leak detection equipment control device 400 as shown in Figure 2, comprise and fill nitrogen control unit 410, bleed control unit 420 and gas supply control unit 430; Wherein:
Fill nitrogen pipeline corresponding to each, fill nitrogen control unit 410 and arrange one and fill nitrogen controlling brancher; Described fills nitrogen controlling brancher by the normally closed contact filling nitrogen switch 411, first pressure detecting element 412, and the power coil 122x filling nitrogen magnetic valve 122 is connected in series composition; Respectively fill between L and the N end that nitrogen controlling brancher is connected in power supply in parallel; The pressure of nitrogen pipeline is filled in first pressure detecting element 412 detection, and automatically closes when filling nitrogen pressure and reach default pressurize value and corresponding fill nitrogen magnetic valve 122;
Corresponding to each vacuum-pumping pipeline, control unit 420 of bleeding arranges a controlling brancher of bleeding; Described controlling brancher of bleeding comprises the switch 421 of bleeding being sequentially connected in series, the power coil 132x of the normally closed contact of the 2nd pressure detecting element 422 and magnetic valve 132 of bleeding, and is connected in the vacuum pump rly. 423 at power coil 132x two ends in parallel; Controlling brancher of respectively bleeding is connected in parallel between L and the N end of power supply; One end of the normally opened contact c of vacuum pump rly. 423, respectively by the switch 421 of bleeding of controlling brancher of respectively bleeding, is connected to the L end of power supply, the other end of all normally opened contact c, and what be attempted by vacuum pump 130 supplies electrical input; 2nd pressure detecting element 422 detects the vacuum tightness of vacuum-pumping pipeline, and reaches when setting requires in vacuum tightness and automatically close corresponding magnetic valve 132 of bleeding; When any road bleed controlling brancher be in connection state time, the coil X of vacuum pump rly. 423 is energized, by the normally opened contact c of correspondence power up start vacuum pump 130; When all each roads bleed controlling brancher be all in closing condition time, vacuum pump 130 stops automatically;
Gas supply control unit 430 is by the normally closed contact of tonifying Qi switch the 431, three pressure detecting element 432, and the power coil 151x of tonifying Qi magnetic valve 151 is composed in series; 3rd pressure detecting element 432 detects the pressure of high pressure gas holder 110, and when the nitrogen pressure of high pressure gas holder 110 can not meet the requirement that constant pressure valve 111 maintains constant pressure, automatically opens tonifying Qi magnetic valve 151.
The first to the 3rd pressure detecting element 412,422 and 432 that the heat pump-unit cooler of the present invention fills nitrogen pressurize leak detection plant control unit can adopt electric contact pressure table or pressure relay, or the similar pressure sensor assembly that air pressure signal can be converted to switching value electrical signal. The preferred embodiment of the first to the 3rd pressure detecting element 412,422 and 432 is electric contact pressure table, and its range ability can respectively according to the operating pressure scope selection of dwell pressure, vacuum tightness setting requirement and high pressure gas holder.
Heat pump-the unit cooler of the present invention according to Fig. 1 fills the embodiment of nitrogen pressurize leak detection equipment, described high pressure gas holder 110 is also connected with safety relief valve 160, when the nitrogen pressure reduction of high pressure gas holder 110 with constant voltage gas tank 120 exceeds the safety range that constant pressure valve 111 maintains constant pressure, the nitrogen of high pressure gas holder 110 is by safety relief valve 160 releasing pressure automatically, thus ensure the nitrogen pressure in high pressure gas holder 110, it is possible to meet the requirement that constant pressure valve 111 maintains constant pressure.
Heat pump-unit cooler according to the present invention fills an embodiment of nitrogen pressurize leak detection equipment, described vacuum pump is variable frequency control vacuum pump, the normally opened contact c of vacuum pump rly. 423 is connected to the control input end of frequency transformer, according to the unit quantity to be vacuumized that vacuum-pumping pipeline connects, automatically change the frequency of vacuum pump.
The present invention for heat pump-unit cooler fill nitrogen pressurize leak detection equipment control method an embodiment as shown in Figure 3, comprise the following steps:
S100: the m entering pressurization leakage detection workspace 200 is overlapped unit 201��20m to be detected, respectively by respective fill that nitrogen rapid-acting coupling 123 is connected to the m bar free time fill nitrogen pipeline;
S120: connect fill nitrogen controlling brancher fill nitrogen switch 411, open correspondence and fill nitrogen pipeline fills nitrogen magnetic valve 122, utilize constant voltage gas tank 120 automatically to treat detection unit and carry out filling nitrogen;
S140: if the first pressure detecting element 412 detects that filling nitrogen pressure reaches default pressurize value: the normally closed contact of the first pressure detecting element 412 disconnects, automatically closes and fills nitrogen magnetic valve 122 on corresponding pipeline; Filling nitrogen rapid-acting coupling 123 by separation, what make this unit disengaging correspondence fills nitrogen pipeline, enters pressurize leak detection state;
S200: fill in nitrogen process at unit, high pressure gas holder 110 to constant voltage gas tank 120 tonifying Qi automatically, ensures constant voltage gas tank pressure-stabilisation when filling nitrogen by constant pressure valve 111; The aperture size of constant pressure valve 111 becomes along with the pressure reduction increase between high pressure gas holder 110 and constant voltage gas tank 120 greatly, thus ensures that constant voltage gas tank 120 is filling pressure-stabilisation in nitrogen process;
S220: utilize expansion gas tank 140 to regulate the capacity of gas in high pressure gas holder 110, make the pressure reduction scope that high pressure gas holder 110 and constant voltage gas tank 120 keep predetermined, preferably, the nitrogen pressure reduction of high pressure gas holder 110 and constant voltage gas tank 120 maintains between 0.2MPa��0.4MPa;
S240: the tonifying Qi switch 431 connecting gas supply control unit 430, if the 3rd pressure detecting element 432 detects that the pressure of high pressure gas holder is lower than minimum operating air pressure: the normally closed contact of the 3rd pressure detecting element 432 closes, tonifying Qi magnetic valve 151 is opened, nitrogen in nitrogengas cylinder 150 is added in high pressure gas holder 110 by tonifying Qi magnetic valve 151, makes high pressure gas holder 110 and constant voltage gas tank 120 be returned within the scope of predetermined pressure reduction;
S260: if the nitrogen pressure of high pressure gas holder 110 exceedes the highest permission operating air pressure: high pressure gas holder, by safety relief valve releasing pressure automatically, makes high pressure gas holder pressure lower than the highest permission operating air pressure; Preferably, the highest permission operating air pressure of high pressure gas holder 110 equals the constant air pressure+0.6MPa of constant voltage gas tank 120;
S300: pressurize leak detection is terminated to send into the n vacuumizing workspace 300 and overlaps unit 301��30n to be vacuumized, be connected to the vacuum-pumping pipeline of n bar free time respectively by respective rapid-acting coupling 133 of bleeding;
S320: the switch 421 of bleeding connecting controlling brancher of bleeding, it is in the normally closed contact of the 2nd pressure detecting element 422 of closed state, connect the magnetic valve 132 of bleeding in corresponding vacuum-pumping pipeline, the normally opened contact c of vacuum pump rly. 423 closes, and starts vacuum pump 130 by the gas suction high pressure gas holder 110 in unit to be vacuumized;
S340: if the 2nd pressure detecting element 422 detects that vacuum tightness reaches setting and requires: the normally closed contact of the 2nd pressure detecting element 422 disconnects, and automatically closes the magnetic valve 132 of bleeding in corresponding vacuum-pumping pipeline, and this unit vacuumizes end; By being separated rapid-acting coupling 133 of bleeding, this unit is made to depart from corresponding vacuum-pumping pipeline;
S360: the unit being connected in vacuum-pumping pipeline if all vacuumizes end: the normally opened contact c of all vacuum pump rly.s 423 respectively bled in controlling brancher all disconnects, closes vacuum pump 130 automatically.
Those of ordinary skill in the art will be appreciated that; above embodiment only is used to illustrate the technical scheme of the present invention; and not it is used as limitation of the invention; any the above embodiment is done based on the connotation of the present invention change, modification, all by the protection domain dropping on the claim of the present invention.
Claims (7)
1. heat pump-unit cooler fills nitrogen pressurize leak detection equipment, nitrogen pressurize leak detection and nitrogen recycling is filled for heat pump or unit cooler production line, what described heat pump or unit cooler production line comprised the pressurization leakage detection workspace of holding unit to be detected and held unit to be vacuumized vacuumizes workspace, it is characterised in that:
The described nitrogen pressurize leak detection equipment that fills comprises high pressure gas holder, constant voltage gas tank, vacuum pump, expansion gas tank and nitrogengas cylinder, what m bar was connected to pressurization leakage detection workspace fills nitrogen pipeline, n bar is connected to the vacuum-pumping pipeline vacuumizing workspace, connects the high pressure tonifying Qi pipeline of high pressure gas holder and nitrogengas cylinder, and for controlling to fill the control device of nitrogen pressure and vacuum tightness; Wherein, m and n be greater than 1 positive integer, determine according to the throughput of heat pump or unit cooler production line;
Described fill nitrogen pipeline comprise be sequentially connected in series fill nitrogen check valve, fill nitrogen magnetic valve and fill nitrogen rapid-acting coupling; Nitrogen magnetic valve and the pipeline that fills between nitrogen rapid-acting coupling are provided with the first pressure detecting element filling; Respectively fill the inlet end filling nitrogen check valve of nitrogen pipeline, it is connected to constant voltage gas tank side by side; Enter the unit to be detected of pressurization leakage detection workspace, be connected respectively to respectively fill nitrogen pipeline fill nitrogen rapid-acting coupling, the nitrogen in constant voltage gas tank by respectively filling nitrogen pipeline, taking constant pressure as the unit automatic nitrogen-charging to be detected in pressurization leakage detection workspace;
High pressure gas holder is connected to constant voltage gas tank by constant pressure valve, by constant pressure valve to the automatic tonifying Qi of constant voltage gas tank, ensures constant voltage gas tank pressure-stabilisation when filling nitrogen; Expansion gas tank is connected to high pressure gas holder, and when the gas volume in high pressure gas holder reduces because leaking, the gas automatic makeup in expansion gas tank is charged in high pressure gas holder, thus ensures the nitrogen pressure in high pressure gas holder, it is possible to meet the requirement that constant pressure valve maintains constant pressure;
Described high pressure tonifying Qi pipeline comprises tonifying Qi magnetic valve, and high pressure gas holder is provided with the 3rd pressure detecting element, and the nitrogen in nitrogengas cylinder is charged in high pressure gas holder by tonifying Qi magnetic valve automatic makeup;
Described vacuum-pumping pipeline comprises the rapid-acting coupling of bleeding being sequentially connected in series, bleed magnetic valve and check valve of bleeding; Bleed magnetic valve and bleed between rapid-acting coupling pipeline on be provided with the 2nd pressure detecting element; The exit end of the check valve of bleeding of each vacuum-pumping pipeline, is connected to the air inlet end of vacuum pump side by side, and the exhaust side of vacuum pump is connected to high pressure gas holder; Complete pressurize leak detection and enter the unit to be vacuumized vacuumizing workspace, by each vacuum-pumping pipeline by the nitrogen recycling discharged in high pressure gas holder;
Described control device comprises and fills nitrogen control unit, bleed control unit and gas supply control unit; Fill nitrogen pipeline corresponding to each, fill nitrogen control unit and arrange one by filling nitrogen switch, the normally closed contact of the first pressure detecting element, and the power coil filling nitrogen magnetic valve be connected in series composition fill nitrogen controlling brancher; Corresponding to each vacuum-pumping pipeline, control unit of bleeding arranges a controlling brancher of bleeding; Described controlling brancher of bleeding comprises the switch of bleeding being sequentially connected in series, the power coil of the normally closed contact of the 2nd pressure detecting element and magnetic valve of bleeding, and is connected in the vacuum pump rly. at power coil two ends in parallel; Respectively fill nitrogen controlling brancher and controlling brancher of bleeding is connected in parallel between L and the N end of power supply; Gas supply control unit by tonifying Qi switch, the normally closed contact of the 3rd pressure detecting element, and the power coil of tonifying Qi magnetic valve is composed in series.
2. heat pump-unit cooler according to claim 1 fills nitrogen pressurize leak detection equipment, it is characterized in that described high pressure gas holder is also connected with safety relief valve, when the nitrogen pressure reduction of high pressure gas holder and constant voltage gas tank exceeds the safety range that constant pressure valve maintains constant pressure, the nitrogen of high pressure gas holder is by safety relief valve releasing pressure automatically, thus ensure the nitrogen pressure in high pressure gas holder, it is possible to meet the requirement that constant pressure valve maintains constant pressure.
3. heat pump-unit cooler according to claim 1 fills nitrogen pressurize leak detection equipment, it is characterized in that described vacuum pump is variable frequency control vacuum pump, the normally opened contact of vacuum pump rly. is connected to the control input end of frequency transformer, according to the unit quantity to be vacuumized that vacuum-pumping pipeline connects, automatically change the frequency of vacuum pump.
4. one kind is filled the control method of nitrogen pressurize leak detection equipment for the heat pump-unit cooler described in claim 1,2 or 3, it is characterised in that comprise the following steps:
S100: the m entering pressurization leakage detection workspace is overlapped unit to be detected, respectively by respective fill that nitrogen rapid-acting coupling is connected to the m bar free time fill nitrogen pipeline;
S120: connect fill nitrogen controlling brancher fill nitrogen switch, open correspondence and fill nitrogen pipeline fills nitrogen magnetic valve, utilize constant voltage gas tank automatically to treat detection unit and carry out filling nitrogen;
S140: if the first pressure detecting element detects that filling nitrogen pressure reaches default pressurize value: the normally closed contact of the first pressure detecting element disconnects, automatically closes and fills nitrogen magnetic valve on corresponding pipeline; Filling nitrogen rapid-acting coupling by separation, what make this unit disengaging correspondence fills nitrogen pipeline, enters pressurize leak detection state;
S200: fill in nitrogen process at unit, high pressure gas holder to the automatic tonifying Qi of constant voltage gas tank, ensures constant voltage gas tank pressure-stabilisation when filling nitrogen by constant pressure valve; The aperture size of constant pressure valve becomes along with the pressure reduction increase between high pressure gas holder and constant voltage gas tank greatly, thus ensures that constant voltage gas tank is filling pressure-stabilisation in nitrogen process;
S220: utilize expansion gas tank to regulate the capacity of gas in high pressure gas holder, make the nitrogen pressure reduction scope that high pressure gas holder and constant voltage gas tank keep predetermined;
S240: the tonifying Qi switch connecting gas supply control unit, if the 3rd pressure detecting element detects that the pressure of high pressure gas holder is lower than minimum operating air pressure: the normally closed contact of the 3rd pressure detecting element closes, tonifying Qi magnetic valve is opened, nitrogen in nitrogengas cylinder adds in high pressure gas holder by tonifying Qi magnetic valve, makes high pressure gas holder and constant voltage gas tank be returned within the scope of predetermined pressure reduction;
S300: pressurize leak detection is terminated to send into the n vacuumizing workspace and overlaps unit to be vacuumized, be connected to the vacuum-pumping pipeline of n bar free time respectively by respective rapid-acting coupling of bleeding;
S320: the switch of bleeding connecting controlling brancher of bleeding, it is in the normally closed contact of the 2nd pressure detecting element of closed state, connect the magnetic valve of bleeding in corresponding vacuum-pumping pipeline, the normally opened contact of vacuum pump rly. closes, and starts vacuum pump by the gas suction high pressure gas holder in unit to be vacuumized;
S340: if the 2nd pressure detecting element detects that vacuum tightness reaches setting and requires: the normally closed contact of the 2nd pressure detecting element disconnects, and automatically closes the magnetic valve of bleeding in corresponding vacuum-pumping pipeline, and this unit vacuumizes end; By being separated rapid-acting coupling of bleeding, this unit is made to depart from corresponding vacuum-pumping pipeline;
S360: the unit being connected in vacuum-pumping pipeline if all vacuumizes end: the normally opened contact of all vacuum pump rly.s respectively bled in controlling brancher all disconnects, and automatically closes vacuum pump.
5. heat pump-unit cooler according to claim 4 fills the control method of nitrogen pressurize leak detection equipment, it is characterised in that the nitrogen pressure reduction scope of described high pressure gas holder and constant voltage gas tank is between 0.2MPa��0.4MPa.
6. heat pump-unit cooler according to claim 4 fills the control method of nitrogen pressurize leak detection equipment, fills nitrogen pressurize leak detection equipment for heat pump-unit cooler according to claim 2, it is characterised in that also comprise the following steps after step S240:
S260: if the nitrogen pressure of high pressure gas holder exceedes the highest permission operating air pressure of high pressure gas holder: high pressure gas holder, by safety relief valve releasing pressure automatically, makes high pressure gas holder pressure lower than the highest permission operating air pressure.
7. heat pump-unit cooler according to claim 6 fills the control method of nitrogen pressurize leak detection equipment, it is characterised in that the highest permission operating air pressure of described high pressure gas holder equals the constant air pressure+0.6MPa of constant voltage gas tank.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410287070.XA CN104062076B (en) | 2014-06-24 | 2014-06-24 | A kind of heat pump-unit cooler fills nitrogen pressurize leak detection equipment and control method thereof |
| PCT/CN2015/082019 WO2015196955A1 (en) | 2014-06-24 | 2015-06-23 | Nitrogen-filling, pressure-keeping and leakage-detecting device for heat pump-refrigerating unit and control method therefor and device therefor |
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| CN201410287070.XA CN104062076B (en) | 2014-06-24 | 2014-06-24 | A kind of heat pump-unit cooler fills nitrogen pressurize leak detection equipment and control method thereof |
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| WO2015196955A1 (en) * | 2014-06-24 | 2015-12-30 | 江苏天舒电器有限公司 | Nitrogen-filling, pressure-keeping and leakage-detecting device for heat pump-refrigerating unit and control method therefor and device therefor |
| CN104748923B (en) * | 2014-09-29 | 2017-05-31 | 浙江吉利控股集团有限公司 | The air-leakage test and nitrogen displacement system and its control method of dual-fuel automobile |
| CN106595384A (en) * | 2016-12-09 | 2017-04-26 | 安徽亿瑞深冷能源科技有限公司 | Automatic cleaning system for refrigerator |
| CN112051008A (en) * | 2020-09-14 | 2020-12-08 | 珠海许继电气有限公司 | Single-interval cabinet body parallel vacuum leak detection device and method thereof |
| CN114235301B (en) * | 2021-11-09 | 2024-05-03 | 上海贤日测控科技有限公司 | Air tightness detection system and method thereof |
| CN114518206A (en) * | 2022-02-22 | 2022-05-20 | 佛山市美的清湖净水设备有限公司 | Membrane element air tightness detection system and detection method |
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| RU2516747C2 (en) * | 2012-06-14 | 2014-05-20 | Открытое Акционерное Общество "Государственное Машиностроительное Конструкторское Бюро "Радуга" Имени А.Я. Березняка" | System for high-pressure pneumatic unit preparation for operation |
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Address after: 221600 Jiangsu city of Nantong Province, Nantong Development Zone, Road No. 1692 building 20 Patentee after: Jiangsu Tianshu electrical Limited by Share Ltd Address before: 221600 Jiangsu city of Nantong Province, Nantong Development Zone, Road No. 1692 building 20 Patentee before: Jiangsu Tianshu Electrical Appliance Co., Ltd. |