CN106352473A

CN106352473A - Multi-online system and fault detection device of super-cooling branch valve body assembly

Info

Publication number: CN106352473A
Application number: CN201610695913.9A
Authority: CN
Inventors: 王命仁; 李元阳
Original assignee: Midea Group Co Ltd; Guangdong Midea HVAC Equipment Co Ltd
Current assignee: Midea Group Co Ltd; Guangdong Midea HVAC Equipment Co Ltd
Priority date: 2016-08-19
Filing date: 2016-08-19
Publication date: 2017-01-25
Anticipated expiration: 2036-08-19
Also published as: CN106352473B

Abstract

The invention discloses a multi-online system and a fault detection device of a super-cooling branch valve body assembly. The multi-online system comprises an outdoor unit, multiple indoor units and a distribution device, wherein the distribution device comprises a first heat exchanger, a second heat exchanger and the super-cooling branch valve body assembly. The method comprises the following steps that a current operating mode of the multi-online system is judged; if the current operating mode of the multi-online system is a pure refrigeration mode, whether the super-cooling branch valve body assembly breaks down or not is judged according to upstream super-cooling degree of the super-cooling branch valve body assembly and the superheating degree at the outlet of the second heat exchange flow path of the first heat exchanger; if the current operating mode of the multi-online system is a pure heating mode, whether the super-cooling branch valve body assembly breaks down or not is judged according to the exhaust superheating degree of a compressor. By the adoption of the method, whether the super-cooling branch valve body assembly breaks down or not is judged rapidly and effectively in the operating process of the multi-online system, and safe and reliable operation of the system is ensured.

Description

Multiple on-line system and its fault detection method of supercool branch road valve component

Technical field

The present invention relates to air-conditioning technical field, particularly to a kind of fault of branch road valve component supercool in multiple on-line system Detection method and a kind of multiple on-line system.

Background technology

Multiple on-line system can be freezed simultaneously and be heated, but due to its system complex, valve body is numerous, not only will have Kind control logic carrys out application valve body action, and valve body to be ensured can normal work, thus ensureing that system can for a long time may be used By running.

Generally, in multiple on-line system, the adapter of indoor set and part flow arrangement needs welded and installed, due to indoor set number of units relatively Many, corresponding solder joint is also more, in system operation it is possible to occur, in the valve body that welding slag is blocked in part flow arrangement, leading to valve Body occur abnormal it is also possible to lead to valve body fault the problems such as because of valve body ageing failure and cannot reliably working.Therefore, how to protect Under conditions of the normal operation of card system, still can rapidly and effectively detect whether the valve body in part flow arrangement breaks down, It is technical problem urgently to be resolved hurrily at present.

Content of the invention

It is contemplated that at least solving one of technical problem in correlation technique to a certain extent.

For this reason, it is an object of the present invention to proposing a kind of fault inspection of supercool branch road valve component in multiple on-line system Survey method, the method can rapidly and effectively judge that supercool branch road valve component is in multiple on-line system running No break down it is ensured that system safe and reliable operation.

Further object is that proposing a kind of multiple on-line system.

To achieve these goals, one aspect of the present invention embodiment proposes supercool branch road valve body in a kind of multiple on-line system The fault detection method of assembly, described multiple on-line system includes off-premises station, multiple indoor set and part flow arrangement, described off-premises station bag Include compressor, described part flow arrangement includes First Heat Exchanger, the second heat exchanger and supercool branch road valve component, described first heat exchange The outlet of the first heat exchange stream of device is connected with the entrance of the first heat exchange stream of described second heat exchanger, described supercool branch road Valve component is arranged on the outlet of the first heat exchange stream of described second heat exchanger and the second heat exchange stream of described second heat exchanger Between the entrance on road, the second heat exchange stream exporting with described First Heat Exchanger of the second heat exchange stream of described second heat exchanger Entrance be connected, the outlet of the second heat exchange stream of described First Heat Exchanger is connected with described off-premises station, described supercool Road valve component includes first throttle element and the first control valve with described first throttle element in parallel, methods described include with Lower step: judge the present mode of operation of described multiple on-line system；If the present mode of operation of described multiple on-line system is pure Refrigeration mode, then before the valve according to described supercool branch road valve component degree of supercooling and described First Heat Exchanger the second heat exchange stream The degree of superheat in exit judge whether described supercool branch road valve component breaks down；And if described multiple on-line system Present mode of operation is pure heating mode, then judge described supercool branch road valve component according to the discharge superheat of described compressor Whether break down.

In multiple on-line system according to embodiments of the present invention, the fault detection method of supercool branch road valve component, first determines whether The present mode of operation of multiple on-line system, if the present mode of operation of multiple on-line system is pure refrigeration mode, according to supercool Before the valve of branch road valve component, the degree of superheat in the exit of the second heat exchange stream of degree of supercooling and First Heat Exchanger judges supercool Whether road valve component breaks down；If the present mode of operation of multiple on-line system is pure heating mode, according to compressor Discharge superheat judge whether supercool branch road valve component breaks down.Thus in multiple on-line system running, can Rapidly and effectively judge whether supercool branch road valve component breaks down it is ensured that system safe and reliable operation.

According to one embodiment of present invention, degree of supercooling and described first before the valve according to described supercool branch road valve component The degree of superheat in the exit of the second heat exchange stream of heat exchanger judges whether described supercool branch road valve component breaks down, bag Include: if degree of supercooling is more than the of the first default degree of supercooling and described First Heat Exchanger before the valve of described supercool branch road valve component The degree of superheat in the exit of two heat exchange streams is more than the first default degree of superheat, then control described supercool branch road valve component to be opened Big regulation, and judge the second heat exchange stream of degree of supercooling and described First Heat Exchanger before the valve of described supercool branch road valve component again The degree of superheat in the exit on road；If degree of supercooling is persistently more than before the valve of described supercool branch road valve component in the first Preset Time The degree of superheat in the first default degree of supercooling and the exit of the second heat exchange stream of described First Heat Exchanger is persistently more than first and presets The degree of superheat, then judge described supercool branch road valve body component failure.

According to one embodiment of present invention, after judging described supercool branch road valve body component failure, also include: Control described first throttle element and described first control valve to be turned off, and after described multiple on-line system stable operation, control Described first control valve is opened, and controls described first throttle element to remain off；Judge described in the second Preset Time Whether the reduction amount of the degree of superheat in exit of the second heat exchange stream of First Heat Exchanger is less than the first preset value or described pressure Whether the reduction amount of the discharge superheat of contracting machine is less than the second preset value；If described first heat exchange in described second Preset Time The reduction amount of the degree of superheat in exit of the second heat exchange stream of device is less than the row of described first preset value or described compressor The reduction amount of the gas degree of superheat is less than described second preset value, then judge that described first control valve breaks down.

According to one embodiment of present invention, after judging described supercool branch road valve body component failure, also include: Control described first throttle element and described first control valve to be turned off, and after described multiple on-line system stable operation, control Described first throttle element is opened to default maximum opening, and controls described first control valve to remain off；Judge the 3rd In Preset Time, whether the reduction amount of the degree of superheat in exit of the second heat exchange stream of described First Heat Exchanger is pre- less than the 3rd If whether the reduction amount of the discharge superheat of value or described compressor is less than the 4th preset value；If the described 3rd default when The reduction amount of the degree of superheat in exit of the second heat exchange stream of interior described First Heat Exchanger be less than described 3rd preset value or The reduction amount of the discharge superheat of compressor described in person is less than described 4th preset value, then judge that described first throttle element occurs Fault.

According to one embodiment of present invention, described supercool branch road valve body is judged according to the discharge superheat of described compressor Whether assembly breaks down, comprising: if the difference between the discharge superheat of described compressor and the target exhaust degree of superheat is big In the 5th preset value, then the aperture of described supercool branch road valve component is controlled to become big；Judge described compression in the 4th Preset Time Whether the difference between the discharge superheat of machine and the described target exhaust degree of superheat is more than the 6th preset value, and judge described compression Whether the variable quantity of the discharge superheat of machine is less than the 7th preset value；If the row of described compressor in described 4th Preset Time Difference between the gas degree of superheat and the described target exhaust degree of superheat is more than the aerofluxuss of described 6th preset value and described compressor The variable quantity of temperature is less than described 7th preset value, then judge described supercool branch road valve body component failure.

According to one embodiment of present invention, after judging described supercool branch road valve body component failure, also include: Control described first throttle element to keep the first default aperture constant, and after described multiple on-line system stable operation, control institute State the first control valve to open；Judge whether the reduction amount of the discharge superheat of described compressor in the 5th Preset Time is less than the 8th Preset value；If the reduction amount of the discharge superheat of described compressor is less than the described 8th and presets in described 5th Preset Time Value, then judge that described first control valve breaks down.

According to one embodiment of present invention, after judging described supercool branch road valve body component failure, also include: Control described first throttle element to open to default maximum opening, and control described first control valve to remain off；Judge In 6th Preset Time, whether the reduction amount of the discharge superheat of described compressor is less than the 9th preset value；If it is determined that described In six Preset Times, the reduction amount of the discharge superheat of described compressor is less than described 9th preset value, then judge described first segment Fluid element breaks down.

To achieve these goals, a kind of multiple on-line system that another aspect of the present invention embodiment proposes, comprising: outdoor Machine, described off-premises station includes compressor；Multiple indoor sets；Part flow arrangement, described part flow arrangement includes First Heat Exchanger, second changes Hot device and supercool branch road valve component, the outlet of the first heat exchange stream of described First Heat Exchanger and the of described second heat exchanger The entrance of one heat exchange stream is connected, and described supercool branch road valve component is arranged on the first heat exchange stream of described second heat exchanger Outlet and the entrance of the second heat exchange stream of described second heat exchanger between, the second heat exchange stream of described second heat exchanger Outlet is connected with the entrance of the second heat exchange stream of described First Heat Exchanger, the second heat exchange stream of described First Heat Exchanger Outlet is connected with described off-premises station, and described supercool branch road valve component includes first throttle element and first with described first throttle Part the first control valve in parallel；Control module, described control module is used for judging the present mode of operation of described multiple on-line system, Wherein, if the present mode of operation of described multiple on-line system is pure refrigeration mode, described control module is then according to described supercool Before the valve of branch road valve component, the degree of superheat in the exit of the second heat exchange stream of degree of supercooling and described First Heat Exchanger judges institute State whether supercool branch road valve component breaks down；If the present mode of operation of described multiple on-line system is pure heating mode, According to the discharge superheat of described compressor, described control module then judges whether described supercool branch road valve component breaks down.

Multiple on-line system according to embodiments of the present invention, control module first determines whether the current operation mould of multiple on-line system Formula, if the present mode of operation of multiple on-line system is pure refrigeration mode, control module is then according to supercool branch road valve component Before valve, whether the degree of superheat in the exit of the second heat exchange stream of degree of supercooling and First Heat Exchanger judges supercool branch road valve component Break down；If the present mode of operation of multiple on-line system is pure heating mode, the control module then aerofluxuss according to compressor The degree of superheat judges whether supercool branch road valve component breaks down.Thus in multiple on-line system running, can quickly and Effectively judge whether supercool branch road valve component breaks down it is ensured that system safe and reliable operation.

According to one embodiment of present invention, supercool before the valve according to described supercool branch road valve component for the described control module Whether the degree of superheat in the exit of the second heat exchange stream of degree and described First Heat Exchanger judges described supercool branch road valve component When breaking down, wherein, if degree of supercooling is more than the first default degree of supercooling and described before the valve of described supercool branch road valve component The degree of superheat in the exit of the second heat exchange stream of First Heat Exchanger is more than the first default degree of superheat, and described control module then controls Described supercool branch road valve component carries out out big regulation, and judge again before the valve of described supercool branch road valve component degree of supercooling and The degree of superheat in the exit of the second heat exchange stream of described First Heat Exchanger；If described supercool bypass valve in the first Preset Time Before the valve of body assembly, degree of supercooling is persistently more than the first default degree of supercooling and the outlet of the second heat exchange stream of described First Heat Exchanger The degree of superheat at place is persistently more than the first default degree of superheat, and described control module then judges that described supercool branch road valve component occurs event Barrier.

According to one embodiment of present invention, described control module is judging described supercool branch road valve body component failure Afterwards, described first throttle element and described first control valve is also controlled to be turned off, and in described multiple on-line system stable operation Afterwards, control described first control valve to open, and control described first throttle element to remain off, and judge that second presets In time the reduction amount of the degree of superheat in exit of the second heat exchange stream of described First Heat Exchanger whether less than the first preset value, Or whether the reduction amount of the discharge superheat of described compressor is less than the second preset value, wherein, if described second default when The reduction amount of the degree of superheat in exit of the second heat exchange stream of interior described First Heat Exchanger be less than described first preset value or The reduction amount of the discharge superheat of compressor described in person is less than described second preset value, and described control module then judges described first Control valve breaks down.

According to one embodiment of present invention, described control module is judging described supercool branch road valve body component failure Afterwards, described first throttle element and described first control valve is also controlled to be turned off, and in described multiple on-line system stable operation Afterwards, control described first throttle element to open to default maximum opening, and control described first control valve to remain off, with And judge described First Heat Exchanger in the 3rd Preset Time the degree of superheat in exit of the second heat exchange stream reduction amount whether Whether it is less than the 4th preset value less than the reduction amount of the 3rd preset value or the discharge superheat of described compressor, wherein, if In described 3rd Preset Time, the reduction amount of the degree of superheat in exit of the second heat exchange stream of described First Heat Exchanger is less than institute The reduction amount stating the discharge superheat of the 3rd preset value or described compressor is less than described 4th preset value, described control mould Block then judges described first throttle element failure.

According to one embodiment of present invention, described control module is according to the discharge superheat of described compressor judges When whether supercool branch road valve component breaks down, wherein, if the discharge superheat of described compressor is overheated with target exhaust Difference between degree is more than the 5th preset value, and described control module then controls the aperture of described supercool branch road valve component to become big； Described control module judges in the 4th Preset Time between the discharge superheat of described compressor and the described target exhaust degree of superheat Difference whether be more than the 6th preset value, and judge whether the variable quantity of the discharge superheat of described compressor is preset less than the 7th Value；If the difference between the discharge superheat of described compressor and the described target exhaust degree of superheat in described 4th Preset Time More than described 6th preset value and the discharge superheat of described compressor variable quantity be less than described 7th preset value, described control Module then judges described supercool branch road valve body component failure.

According to one embodiment of present invention, described control module is judging described supercool branch road valve body component failure Afterwards, described first throttle element is also controlled to keep the first default aperture constant, and after described multiple on-line system stable operation, Control described first control valve to open, and judge that the reduction amount of the discharge superheat of described compressor in the 5th Preset Time is No it is less than the 8th preset value, wherein, if the reduction amount of the discharge superheat of described compressor is little in described 5th Preset Time In described 8th preset value, described control module then judges that described first control valve breaks down.

According to one embodiment of present invention, described control module is judging described supercool branch road valve body component failure Afterwards, also control described first throttle element to open to default maximum opening, and control described first control valve to remain turned-off shape State, and whether judge the reduction amount of the discharge superheat of described compressor in the 6th Preset Time less than the 9th preset value, its In, if it is determined that the reduction amount of the discharge superheat of described compressor is preset less than the described 9th in described 6th Preset Time Value, described control module then judges described first throttle element failure.

Brief description

Fig. 1 is the stream of the fault detection method of supercool branch road valve component in multiple on-line system according to embodiments of the present invention Cheng Tu；

Fig. 2 is the supercool bypass valve when multiple on-line system is run with pure refrigeration mode according to an embodiment of the invention The flow chart of body component faults detection method；

Fig. 3 is the supercool bypass valve when multiple on-line system is run with pure heating mode according to an embodiment of the invention The flow chart of body component faults detection method；

Fig. 4 is coolant flow graph when multiple on-line system according to an embodiment of the invention is run with pure refrigeration mode； And

Fig. 5 is coolant flow graph when multiple on-line system according to an embodiment of the invention is run with pure heating mode.

Specific embodiment

Embodiments of the invention are described below in detail, the example of described embodiment is shown in the drawings, wherein from start to finish The element that same or similar label represents same or similar element or has same or like function.Below with reference to attached The embodiment of figure description is exemplary it is intended to be used for explaining the present invention, and is not considered as limiting the invention.

Supercool branch road valve component in the multiple on-line system of proposition according to embodiments of the present invention to be described with reference to the accompanying drawings Fault detection method and multiple on-line system.

Fig. 1 is the stream of the fault detection method of supercool branch road valve component in multiple on-line system according to embodiments of the present invention Cheng Tu.

In an embodiment of the present invention, as shown in Figure 4 and Figure 5, multiple on-line system can include off-premises station, multiple indoor set And part flow arrangement.Off-premises station includes compressor.Part flow arrangement includes First Heat Exchanger, the second heat exchanger and supercool branch road valve body group Part, the outlet of the first heat exchange stream of First Heat Exchanger is connected with the entrance of the first heat exchange stream of the second heat exchanger, supercool Branch road valve component is arranged on outlet and the second heat exchange stream of the second heat exchanger of the first heat exchange stream of the second heat exchanger Between entrance, the outlet of the second heat exchange stream of the second heat exchanger is connected with the entrance of the second heat exchange stream of First Heat Exchanger Logical, the outlet of the second heat exchange stream of First Heat Exchanger is connected with off-premises station, and supercool branch road valve component includes first throttle Element and the first control valve with first throttle element in parallel.

As shown in figure 1, the fault detection method of supercool branch road valve component can comprise the following steps that in this multiple on-line system

S1, judges the present mode of operation of multiple on-line system.

S2, if the present mode of operation of multiple on-line system is pure refrigeration mode, according to supercool branch road valve component Before valve, whether the degree of superheat in the exit of the second heat exchange stream of degree of supercooling and First Heat Exchanger judges supercool branch road valve component Break down.

Wherein, degree of supercooling scm2=tps2-tm2 before the valve of supercool branch road valve component, tps2 is supercool branch road valve body group The corresponding saturation temperature of upstream pressure of part, tm2 be supercool branch road valve component valve before temperature；The second of First Heat Exchanger is changed Degree of superheat shm3=tm3-tps3 in the exit of hot flowpath, tm3 is the exit of the second heat exchange stream of First Heat Exchanger Temperature, tps3 is the corresponding saturation temperature of pressure in the exit of the second heat exchange stream of First Heat Exchanger.

According to one embodiment of present invention, when multiple on-line system is run with pure refrigeration mode, according to supercool bypass valve Before the valve of body assembly, the degree of superheat in the exit of the second heat exchange stream of degree of supercooling and First Heat Exchanger judges supercool branch road valve body Whether assembly breaks down, comprising: if degree of supercooling is more than the first default degree of supercooling and the before the valve of supercool branch road valve component The degree of superheat in the exit of the second heat exchange stream of one heat exchanger is more than the first default degree of superheat, then control supercool branch road valve body group Part carries out out big regulation, and judges the second heat exchange stream of degree of supercooling and First Heat Exchanger before the valve of supercool branch road valve component again The degree of superheat in the exit on road；If degree of supercooling is persistently more than first before the valve of supercool branch road valve component in the first Preset Time The degree of superheat in the exit of the second heat exchange stream of default degree of supercooling and First Heat Exchanger is persistently more than the first default degree of superheat, then Judge supercool branch road valve body component failure.Wherein, the first default degree of supercooling, the first default degree of superheat and the first Preset Time Can be demarcated according to practical situation, for example, the first default degree of supercooling can be 5 DEG C, and the first default degree of superheat can be 8 DEG C, First Preset Time can be 10min.

Specifically, as shown in figure 4, when multiple on-line system is run with pure refrigeration mode, from off-premises station out excessively cold Matchmaker after the gas-liquid separator of part flow arrangement, First Heat Exchanger, the second restricting element, the second heat exchanger and refrigeration check valve, After the restricting element throttling of the indoor set that freezes, absorbed heat in the indoor set having refrigeration can need, then passed through corresponding refrigeration Electromagnetic valve flows into the low-voltage tube of off-premises station, eventually passes back to off-premises station.Meanwhile, in order to prevent high-pressure liquid coolant defeated to indoor set Shwoot occurs when sending, it is desirable to have enough degree of supercoolings, to ensure refrigeration, therefore, are provided with supercool branch road in part flow arrangement, And with series connection First Heat Exchanger and the second heat exchanger as aftercooler.Enter the coolant of refrigeration indoor set by aftercooler again Cooling, and the coolant through cooling circuit more then takes away aftercooler liberated heat, through cooling circuit again coolant with from After refrigeration indoor set coolant out converges, return to off-premises station.

When multiple on-line system is run with pure refrigeration mode, according to control logic, the aperture of first throttle element is little opening Degree, plays throttling action in supercool branch road, but when the discharge superheat of compressor is excessive, by opening big first throttle element Aperture, can play Liquid injection cooling, reduce the effect of discharge superheat.Meanwhile, in order to reduce back liquid risk, usual first control Valve is closed, and only when discharge superheat is too big, opens the first control valve to play the effect of Liquid injection cooling.

Therefore, when multiple on-line system is run with pure refrigeration mode and does not owe coolant, the cooling due to the second heat exchanger is made With certain degree of supercooling will be kept before the valve of first throttle element, and, works as the second heat exchange stream First Heat Exchanger is detected When degree of superheat shm3 in the exit on road is larger, according to control logic, need to tune up the aperture of first throttle element, now, Degree of superheat shm3 in the exit of the second heat exchange stream of First Heat Exchanger will reduce, thus reducing the discharge superheat of system. Therefore, in system normal course of operation, if the degree of superheat in the exit of the second heat exchange stream of First Heat Exchanger is detected Before shm3 ＞ first presets the degree of superheat and the valve of supercool branch road valve component, degree of supercooling scm2 ＞ first presets degree of supercooling, and This state continues more than 10min, then may determine that supercool branch road valve body component failure.Thus in system operation, Can rapidly and effectively judge whether supercool branch road valve component sends fault, and the system that do not affect normally is run.

According to one embodiment of present invention, after judging supercool branch road valve body component failure, also include: control First throttle element and the first control valve are turned off, and after multiple on-line system stable operation, control the first control valve to open, and First throttle element is controlled to remain off；Judge the outlet of the second heat exchange stream of First Heat Exchanger in the second Preset Time The reduction amount of the degree of superheat at place whether less than the first preset value or the discharge superheat of compressor reduction amount whether less than the Two preset values；If the reduction amount of the degree of superheat in exit of the second heat exchange stream of First Heat Exchanger is little in the second Preset Time Reduction amount in the first preset value or the discharge superheat of compressor is less than the second preset value, then judge that the first control valve is sent out Raw fault.Wherein, the second Preset Time, the first preset value and the second preset value can be demarcated according to practical situation, for example, the Two Preset Times can be 3min, and the first preset value can be 5 DEG C, and the second preset value can be 5 DEG C.

Further, after judging supercool branch road valve body component failure, also include: control first throttle element and First control valve is turned off, and after multiple on-line system stable operation, controls first throttle element to open to default maximum opening, And control the first control valve to remain off；Judge the outlet of the second heat exchange stream of First Heat Exchanger in the 3rd Preset Time The reduction amount of the degree of superheat at place whether less than the 3rd preset value or the discharge superheat of compressor reduction amount whether less than the Four preset values；If the reduction amount of the degree of superheat in exit of the second heat exchange stream of First Heat Exchanger is little in the 3rd Preset Time Reduction amount in the 3rd preset value or the discharge superheat of compressor is less than the 4th preset value, then judge first throttle element Break down.Wherein, the 3rd Preset Time, the 3rd preset value, the 4th preset value and default maximum opening can be according to actual feelings Condition is demarcated, and for example, the 3rd Preset Time can be 3min, and the 3rd preset value can be 3 DEG C, and the 4th preset value can be 3 ℃.

That is, when multiple on-line system is run with pure refrigeration mode, first supercool branch road is judged according to decision condition Whether valve component breaks down, and then judges that specifically which valve body breaks down further according to decision condition.

Specifically, after judging according to decision condition whether supercool branch road valve component breaks down, first control first Restricting element and the first control valve are turned off, and after system stability, then judge whether first throttle element and the first control valve are sent out Raw fault.

For example, after system stability, can first detect whether the first control valve breaks down, now send the first control valve Open command, and control first throttle element to remain off.If the second heat exchange stream of First Heat Exchanger in certain time Reduction amount ＜ first preset value of degree of superheat shm3 in the exit on road, then illustrate that the first control valve reality is not opened, and reports first Control valve fault；Otherwise, the first control valve is normal.

Then, send the instruction of first throttle element standard-sized sheet, and control the first control valve to remain off, to detect first Whether restricting element breaks down.If the degree of superheat in the exit of the second heat exchange stream of First Heat Exchanger in certain time Reduction amount ＜ the 3rd preset value of shm3, then illustrate that first throttle element reality is not opened, and reports first throttle element fault；No Then, first throttle element is normal.Such that it is able to determine whether out it is which valve body breaks down.

Except degree of superheat shm3 in the exit of the second heat exchange stream according to First Heat Exchanger detect specifically which Valve body breaks down, and can also be detected according to the discharge superheat of compressor.

Likewise, first controlling first throttle element and the first control valve to be turned off, after system stability, can first detect the Whether one control valve breaks down, and now sends the first control valve open command, and controls first throttle element to remain turned-off shape State.If reduction amount ＜ second preset value of the discharge superheat of certain time inner compressor, illustrate that the first control valve is actual Do not open, report the first control valve fault；Otherwise, the first control valve is normal.

Then, send the instruction of first throttle element standard-sized sheet, and control the first control valve to remain off, to detect first Whether restricting element breaks down.If reduction amount ＜ the 4th preset value of the discharge superheat of certain time inner compressor, Illustrate that first throttle element reality is not opened, report first throttle element fault；Otherwise, first throttle element is normal.Thus also may be used To determine whether out being which valve body breaks down.

Further, as shown in Fig. 2 when multiple on-line system is run with pure refrigeration mode, supercool in multiple on-line system The fault detection method of road valve component can comprise the following steps that

S101, when system is run with pure refrigeration mode, determine whether scm2 ＞ first preset such as 5 DEG C of degree of supercooling and Shm3 ＞ first presets such as 8 DEG C of the degree of superheat.If it is, execution step s102；If not, return to step s101.

S102, supercool branch road valve body component failure.

S103, controls first throttle element and the first control valve to be turned off.

S104, system stable operation.

S105, controls the first control valve to open, and controls first throttle element to be closed.

S106, judges in the second preset time t 2, and whether the reduction amount of shm3 is less than such as 5 DEG C of the first preset value or pressure The reduction amount of the discharge superheat of contracting machine is less than such as 5 DEG C of the second preset value.If it is, execution step s107；If not, executing step Rapid s108.

S107, the first control valve breaks down.

S108, the first control valve normal work.

S109, controls first throttle element to open to default maximum opening, and controls the first control valve to remain off.

S110, judges in the 3rd preset time t 3, and whether the reduction amount of shm3 is less than such as 3 DEG C of the 3rd preset value or pressure The reduction amount of the discharge superheat of contracting machine is less than such as 3 DEG C of the 4th preset value.If it is, execution step s111；If not, executing step Rapid s112.

S111, first throttle element failure.

S112, first throttle element normal work.

Therefore, in multiple on-line system according to embodiments of the present invention supercool branch road valve component fault detection method, In multiple on-line system running, not only can rapidly and effectively judge whether supercool branch road valve component breaks down, And may determine that specifically which valve body breaks down.

S3, if the present mode of operation of multiple on-line system is pure heating mode, according to the discharge superheat of compressor Judge whether supercool branch road valve component breaks down.

According to one embodiment of present invention, when multiple on-line system is run with pure heating mode, according to the row of compressor The gas degree of superheat judges whether supercool branch road valve component breaks down, comprising: if the discharge superheat of compressor is arranged with target Difference between the gas degree of superheat is more than the 5th preset value, then control the aperture of supercool branch road valve component to become big；Judge that the 4th is pre- If whether the difference between the discharge superheat of time inner compressor and the target exhaust degree of superheat is more than the 6th preset value, and judge Whether the variable quantity of the discharge superheat of compressor is less than the 7th preset value；If the aerofluxuss of the 4th Preset Time inner compressor Difference between temperature and the target exhaust degree of superheat is more than the 6th preset value and the variable quantity of the discharge superheat of compressor is less than 7th preset value, then judge supercool branch road valve body component failure.Wherein, the 5th to the 7th preset value and the 4th Preset Time Can be demarcated according to practical situation, for example, the 5th preset value can be 3 DEG C, and the 6th preset value can be 8 DEG C, and the 7th presets Value can be 5 DEG C, and the 4th Preset Time can be 10min.

Specifically, as shown in figure 5, when multiple on-line system is run with pure heating mode, from off-premises station out overheated cold The gas-liquid separator through part flow arrangement for the matchmaker, heat after electromagnetic valve, after having and heating heat release in the indoor set that can need, by heating chamber The the first heat exchange stream entrance first heating check valve, the second heat exchanger after the restricting element throttling of interior machine, through part flow arrangement Restricting element, after first throttle element expands, the second heat exchange stream through the second heat exchanger, the second of First Heat Exchanger changes Hot flowpath enters the low-voltage tube of off-premises station, returns to off-premises station.

When multiple on-line system is run with pure heating mode, make the aerofluxuss of system by controlling supercool branch road valve component The degree of superheat be in one reasonably interval, to ensure that off-premises station has rational flow.And if supercool branch road valve component is opened Open excessive, then return-air flow becomes big, and suction temperature reduces, and then lead to discharge superheat to reduce, if now suitable turns down Supercool branch road valve component, then return-air flow will diminish, suction temperature will rise so that discharge superheat rise.

Therefore, when multiple on-line system is run with pure heating mode and does not owe coolant, if there is the aerofluxuss of compressor Difference ＞ the 5th preset value between temperature dsh and target exhaust degree of superheat dshs, according to control logic, needs to open supercool greatly Road valve component, so that the discharge superheat dsh of compressor reduces.But, after opening supercool greatly bypass valve body assembly, if pressure Difference ＞ the 6th preset value between the discharge superheat dsh of contracting machine and target exhaust degree of superheat dshs and continue 10min with On, and variable quantity ＜ the 7th preset value of the discharge superheat dsh in 10min inner compressor, then may determine that supercool branch road Valve component breaks down.Thus in system operation, can rapidly and effectively judge supercool branch road valve component Whether break down, and the system that do not affect normally is run.

According to one embodiment of present invention, after judging supercool branch road valve body component failure, also include: control First throttle element keeps the first default aperture constant, and after multiple on-line system stable operation, controls the first control valve to open； Judge whether the reduction amount of the discharge superheat of the 5th Preset Time inner compressor is less than the 8th preset value；If the 5th default when Between inner compressor discharge superheat reduction amount be less than the 8th preset value, then judge that the first control valve breaks down.Wherein, One default aperture, the 5th Preset Time and the 8th preset value can be demarcated according to practical situation, and for example, the first default aperture can Think 120 steps, the 5th Preset Time can be 3min, the 8th preset value can be 5 DEG C.

Further, after judging supercool branch road valve body component failure, also include: control first throttle element to open To default maximum opening, and the first control valve is controlled to remain off；Judge the aerofluxuss of the 6th Preset Time inner compressor Whether the reduction amount of the degree of superheat is less than the 9th preset value；If it is determined that the fall of the discharge superheat of the 6th Preset Time inner compressor Low amounts is less than the 9th preset value, then judge first throttle element failure.Wherein, the 6th Preset Time and the 9th preset value can Demarcated according to practical situation, for example, the 6th Preset Time can be 3min, the 9th preset value can be 5 DEG C.

That is, when multiple on-line system is run with pure heating mode, first supercool branch road is judged according to decision condition Whether valve component breaks down, and then judges that specifically which valve body breaks down further according to decision condition.

Specifically, after judging according to decision condition whether supercool branch road valve component breaks down, can first judge Whether the first control valve breaks down, and first controls first throttle element to keep the first default aperture constant, in system stability fortune After row, send the first control valve open command.If reduction amount ＜ the 8th of the discharge superheat dsh of certain time inner compressor Preset value, then illustrate that the first control valve reality is not opened, and reports the first control valve fault；Otherwise, the first control valve is normal.

Then, send the instruction of first throttle element standard-sized sheet, and control the first control valve to remain off, to detect first Whether restricting element breaks down.If reduction amount ＜ the 9th preset value of the discharge superheat dsh of certain time inner compressor, Then explanation first throttle element reality is not opened, and reports first throttle element fault；Otherwise, first throttle element is normal.Thus entering One step judges which valve body breaks down.

Further, as shown in figure 3, when multiple on-line system is run with pure heating mode, supercool in multiple on-line system The fault detection method of road valve component can comprise the following steps that

S201, when system is run with pure heating mode, determines whether such as 3 DEG C of dsh-dshs ＞ the 5th preset value.As It is really, execution step s202；If not, return to step s201.

S202, controls supercool branch road valve component to open greatly.

S203, judges in the 4th preset time t 4, if having the change of such as 8 DEG C and dsh of dsh-dshs ＞ the 6th preset value Such as 5 DEG C of ＜ the 7th preset value of amount.If it is, execution step s204；If not, return to step s203.

S204, supercool branch road valve body component failure.

S205, controls the first control valve to open, and controls first throttle element to keep the first default aperture constant.

S206, judges in the 5th preset time t 5, and whether the reduction amount of dsh is less than such as 5 DEG C of the 8th preset value.If it is, Execution step s207；If not, execution step s208.

S207, the first control valve breaks down.

S208, the first control valve normal work.

S209, controls first throttle element to open to default maximum opening, and controls the first control valve to remain off.

S210, judges in the 6th preset time t 6, and whether the reduction amount of dsh is less than such as 5 DEG C of the 9th preset value.If it is, Execution step s211；If not, execution step s212.

S211, first throttle element failure.

S212, first throttle element normal work.

In sum, in multiple on-line system according to embodiments of the present invention supercool branch road valve component fault detect side Method, first determines whether the present mode of operation of multiple on-line system, if the present mode of operation of multiple on-line system is pure refrigeration mode, Then before the valve according to supercool branch road valve component the exit of the second heat exchange stream of degree of supercooling and First Heat Exchanger the degree of superheat Judge whether supercool branch road valve component breaks down；If the present mode of operation of multiple on-line system is pure heating mode, Judge whether supercool branch road valve component breaks down according to the discharge superheat of compressor.Thus running in multiple on-line system Cheng Zhong, can rapidly and effectively judge whether supercool branch road valve component breaks down it is ensured that system safe and reliable operation.

To describe the multiple on-line system of the embodiment of the present invention below in conjunction with the accompanying drawings in detail.

As shown in Figure 4 and Figure 5, the multiple on-line system of the embodiment of the present invention includes: off-premises station 100, multiple indoor set 200, Part flow arrangement 300 and control module (in figure is not specifically illustrated).

Wherein, off-premises station 100 includes compressor 110.Part flow arrangement 300 includes First Heat Exchanger 310, the second heat exchanger 320 and supercool branch road valve component 330, the of the outlet of the first heat exchange stream of First Heat Exchanger 310 and the second heat exchanger 320 The entrance of one heat exchange stream is connected, and supercool branch road valve component 330 is arranged on the first heat exchange stream of the second heat exchanger 320 Between outlet and the entrance of the second heat exchange stream of the second heat exchanger 320, the outlet of the second heat exchange stream of the second heat exchanger 320 Be connected with the entrance of the second heat exchange stream of First Heat Exchanger 310, the outlet of the second heat exchange stream of First Heat Exchanger 310 with Off-premises station 100 is connected, and supercool branch road valve component 330 includes first throttle element 331 and in parallel with first throttle element 331 The first control valve 332.

Control module is used for judging the present mode of operation of multiple on-line system, wherein, if the current fortune of multiple on-line system Row mode is pure refrigeration mode, control module then degree of supercooling and First Heat Exchanger before the valve according to supercool branch road valve component 330 The degree of superheat in 310 exit of the second heat exchange stream judges whether supercool branch road valve component 330 breaks down；If multi-joint The present mode of operation of machine system is pure heating mode, and control module then judges supercool according to the discharge superheat of compressor 110 Whether branch road valve component 330 breaks down.

Wherein, degree of supercooling scm2=tps2-tm2 before the valve of supercool branch road valve component 330, tps2 is supercool branch road valve body The corresponding saturation temperature of upstream pressure of assembly 330, tm2 be supercool branch road valve component 330 valve before temperature；First Heat Exchanger Degree of superheat shm3=tm3-tps3 in 310 exit of the second heat exchange stream, tm3 is the second heat exchange of First Heat Exchanger 310 The temperature in the exit of stream, tps3 is the corresponding saturation of pressure in the exit of the second heat exchange stream of First Heat Exchanger 310 Temperature.

According to one embodiment of present invention, when multiple on-line system is run with pure refrigeration mode, control module is according to mistake Before the valve of cold branch road valve component 330, the degree of superheat in the exit of the second heat exchange stream of degree of supercooling and First Heat Exchanger 310 is sentenced When whether the supercool branch road valve component 330 that breaks breaks down, wherein, if degree of supercooling before the valve of supercool branch road valve component 330 More than first, the degree of superheat in default degree of supercooling and the exit of the second heat exchange stream of First Heat Exchanger 310 was preset more than first Temperature, control module then controls supercool branch road valve component 330 to carry out out big regulation, and judges supercool branch road valve component again The degree of superheat in the exit of the second heat exchange stream of degree of supercooling and First Heat Exchanger 310 before 330 valve；If the first Preset Time Before the valve of interior supercool branch road valve component 330, degree of supercooling is persistently more than the second of the first default degree of supercooling and First Heat Exchanger 310 The degree of superheat in the exit of heat exchange stream is persistently more than the first default degree of superheat, and control module then judges supercool branch road valve component 330 break down.Wherein, the first default degree of supercooling can be 5 DEG C, and the first default degree of superheat can be 8 DEG C, the first Preset Time Can be 10min.

Specifically, as shown in figure 4, when multiple on-line system is run with pure refrigeration mode, from off-premises station 100 out supercool Coolant is through the gas-liquid separator 340 of part flow arrangement 300, First Heat Exchanger 310, the second restricting element 350, the second heat exchanger 320 and refrigeration check valve (in figure is not specifically illustrated) after, after the restricting element throttling of the indoor set 220 that freezes, having refrigeration energy The indoor set needing is absorbed heat, and then passes through corresponding refrigeration electromagnetic valve (in figure is not specifically illustrated) and flows into the low of off-premises station 100 Pressure pipe, eventually passes back to off-premises station 100.Meanwhile, in order to prevent high-pressure liquid coolant from when conveying to indoor set, shwoot occurring, need There are enough degree of supercoolings to ensure refrigeration, therefore, in part flow arrangement 300, be provided with supercool branch road, and first with series connection Heat exchanger 310 and the second heat exchanger 320 are as aftercooler.The coolant entering refrigeration indoor set 220 is cooled down by aftercooler again, And the coolant through cooling circuit more then takes away aftercooler liberated heat, through the coolant of cooling circuit again and from cool room After interior machine 220 coolant out converges, return to off-premises station 100.

When multiple on-line system is run with pure refrigeration mode, according to control logic, the aperture of first throttle element 331 is little Aperture, plays throttling action in supercool branch road, but when the discharge superheat of compressor 110 is excessive, by opening big first throttle The aperture of element 331, can play Liquid injection cooling, reduce the effect of discharge superheat.Meanwhile, in order to reduce back liquid risk, lead to Normal first control valve 332 is closed, and only when discharge superheat is too big, opens the first control valve 332 to play hydrojet The effect of cooling.

Therefore, when multiple on-line system is run with pure refrigeration mode and does not owe coolant, due to the cooling of the second heat exchanger 320 Effect, will keep certain degree of supercooling before the valve of first throttle element 331, and, when detecting the of First Heat Exchanger 310 When degree of superheat shm3 in the exit of two heat exchange streams is larger, according to control logic, need the aperture of first throttle element 331 Tune up, now, degree of superheat shm3 in the exit of the second heat exchange stream of First Heat Exchanger 310 will reduce, thus reducing system Discharge superheat.Therefore, in system normal course of operation, if the second heat exchange stream of First Heat Exchanger 310 is detected The degree of superheat shm3 ＞ first in exit preset degree of supercooling scm2 ＞ before the degree of superheat and the valve of supercool branch road valve component 330 First default degree of supercooling, and this state continues more than 10min, then may determine that supercool branch road valve component 330 breaks down. Thus in system operation, can rapidly and effectively judge whether supercool branch road valve component sends fault, and not Impact system is normally run.

According to one embodiment of present invention, control module is after judging that supercool branch road valve component 330 breaks down, Also control first throttle element 331 and the first control valve 332 to be turned off, and after multiple on-line system stable operation, control first Control valve 332 is opened, and controls first throttle element 331 to remain off, and judges in the second Preset Time that first changes Whether the reduction amount of the degree of superheat in exit of the second heat exchange stream of hot device 310 is less than the first preset value or compressor 110 The reduction amount of discharge superheat whether be less than the second preset value, wherein, if First Heat Exchanger 310 in the second Preset Time The reduction amount of the degree of superheat in exit of the second heat exchange stream is less than the discharge superheat of the first preset value or compressor 110 Reduction amount be less than the second preset value, control module then judges that the first control valve 332 breaks down.Wherein, the second Preset Time Can be 3min, the first preset value can be 5 DEG C, the second preset value can be 5 DEG C.Describe in detail, here no longer before concrete Repeat.

Further, control module, after judging that supercool branch road valve component 330 breaks down, also controls first throttle Element 331 and the first control valve 332 are turned off, and after multiple on-line system stable operation, control first throttle element 331 open to Default maximum opening, and control the first control valve 332 to remain off, and judge the first heat exchange in the 3rd Preset Time Whether the reduction amount of the degree of superheat in exit of the second heat exchange stream of device 310 is less than the 3rd preset value or compressor 110 Whether the reduction amount of discharge superheat is less than the 4th preset value, wherein, if in the 3rd Preset Time First Heat Exchanger 310 the The reduction amount of the degree of superheat in exit of two heat exchange streams is less than the discharge superheat of the 3rd preset value or compressor 110 Reduction amount is less than the 4th preset value, and control module then judges that first throttle element 311 breaks down.Wherein, the 3rd Preset Time Can be 3min, the 3rd preset value can be 3 DEG C, the 4th preset value can be 3 DEG C.Describe in detail, here no longer before concrete Repeat.

According to one embodiment of present invention, when multiple on-line system is run with pure heating mode, control module is according to pressure When the discharge superheat of contracting machine 110 judges whether supercool branch road valve component 330 breaks down, wherein, if compressor 110 Difference between discharge superheat and the target exhaust degree of superheat is more than the 5th preset value, and control module then controls supercool branch road valve body The aperture of assembly 330 becomes big；Control module judges discharge superheat and the target exhaust mistake of the 4th Preset Time inner compressor 110 Whether difference between temperature is more than the 6th preset value, and judges whether the variable quantity of the discharge superheat of compressor 110 is less than 7th preset value；If the difference between the discharge superheat of the 4th Preset Time inner compressor 110 and the target exhaust degree of superheat More than the 6th preset value and the variable quantity of the discharge superheat of compressor 110 is less than the 7th preset value, control module then judged Cold branch road valve component 330 breaks down.Wherein, the 5th preset value can be 3 DEG C, and the 6th preset value can be 8 DEG C, and the 7th is pre- If value can be 5 DEG C, the 4th Preset Time can be 10min.

Specifically, as shown in figure 5, when multiple on-line system is run with pure heating mode, from off-premises station 100 out overheated The gas-liquid separator 340 through part flow arrangement 300 for the coolant, heat electromagnetic valve (in figure is not specifically illustrated) after, heat and can need having After heat release in indoor set, after the restricting element throttling heating indoor set 210, the check valve that heats through part flow arrangement 300 (is schemed In not specifically illustrated), the second heat exchanger 320 first heat exchange stream enter first throttle element 331, by first throttle element After 331 expand, the second heat exchange stream through the second heat exchanger 320, the second heat exchange stream of First Heat Exchanger 310 enter off-premises station 100 low-voltage tube, returns to off-premises station 100.

When multiple on-line system is run with pure heating mode, make system by controlling supercool branch road valve component 330 Discharge superheat be in one reasonably interval, to ensure that off-premises station 100 has rational flow.And if supercool branch road valve body Assembly 330 is opened excessive, then return-air flow becomes big, and suction temperature reduces, and then leads to discharge superheat to reduce, if now fitted When turn down supercool branch road valve component 330, then return-air flow will diminish, and suction temperature will rise, so that discharge superheat Degree rises.

Therefore, when multiple on-line system is run with pure heating mode and does not owe coolant, if there is the aerofluxuss of compressor 110 Difference ＞ the 5th preset value between degree of superheat dsh and target exhaust degree of superheat dshs, according to control logic, needs are opened supercool greatly Branch road valve component 330, so that the discharge superheat dsh of compressor 110 reduces.But, opening supercool greatly bypass valve body assembly After 330, if difference ＞ the 6th preset value between the discharge superheat dsh of compressor 110 and target exhaust degree of superheat dshs, And continue more than 10min, and variable quantity ＜ the 7th preset value of the discharge superheat dsh in 10min inner compressor 110, then May determine that supercool branch road valve component 330 breaks down.Thus in system operation, can rapidly and effectively judge Go out whether supercool branch road valve component breaks down, and the system that do not affect normally is run.

According to one embodiment of present invention, control module is after judging that supercool branch road valve component 330 breaks down, Also control first throttle element 331 to keep the first default aperture constant, and after multiple on-line system stable operation, control the first control Valve 332 processed is opened, and judge the discharge superheat of the 5th Preset Time inner compressor 110 reduction amount whether pre- less than the 8th If value, wherein, if the reduction amount of the discharge superheat of the 5th Preset Time inner compressor 110 is less than the 8th preset value, control Module then judges that the first control valve 332 breaks down.Wherein, the first default aperture can be 120 steps, and the 5th Preset Time is permissible For 3min, the 8th preset value can be 5 DEG C.Have been described in before concrete, repeat no more here.

Further, control module, after judging that supercool branch road valve component 330 breaks down, also controls first throttle Element 331 is opened to default maximum opening, and controls the first control valve 332 to remain off, and judge the 6th default when Between the reduction amount of discharge superheat of inner compressor 110 whether be less than the 9th preset value, wherein, if it is determined that the 6th Preset Time The reduction amount of the discharge superheat of inner compressor 110 is less than the 9th preset value, and control module then judges first throttle element 331 Raw fault.Wherein, the 6th Preset Time can be 3min, and the 9th preset value can be 5 DEG C.Have been described in before concrete, Here repeat no more.

In describing the invention it is to be understood that term " first ", " second " are only used for describing purpose, and can not It is interpreted as indicating or imply relative importance or the implicit quantity indicating indicated technical characteristic.Thus, define " the One ", the feature of " second " can be expressed or implicitly include at least one this feature.In describing the invention, " multiple " It is meant that at least two, such as two, three etc., unless otherwise expressly limited specifically.

In the present invention, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection ", " fixation " etc. Term should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected or integral；Can be that machinery connects Connect or electrically connect；Can be to be joined directly together it is also possible to be indirectly connected to by intermediary, can be in two elements The connection in portion or the interaction relationship of two elements, limit unless otherwise clear and definite.For those of ordinary skill in the art For, above-mentioned term concrete meaning in the present invention can be understood as the case may be.

In the description of this specification, reference term " embodiment ", " some embodiments ", " example ", " specifically show The description of example " or " some examples " etc. means specific features, structure, material or the spy describing with reference to this embodiment or example Point is contained at least one embodiment or the example of the present invention.In this manual, to the schematic representation of above-mentioned term not Identical embodiment or example must be directed to.And, the specific features of description, structure, material or feature can be in office Combine in an appropriate manner in one or more embodiments or example.Additionally, in the case of not conflicting, the skill of this area The feature of the different embodiments described in this specification or example and different embodiment or example can be tied by art personnel Close and combine.

Although embodiments of the invention have been shown and described above it is to be understood that above-described embodiment is example Property it is impossible to be interpreted as limitation of the present invention, those of ordinary skill in the art within the scope of the invention can be to above-mentioned Embodiment is changed, changes, replacing and modification.

Claims

1. in a kind of multiple on-line system the fault detection method of supercool branch road valve component it is characterised in that described multi-connected machine system System includes off-premises station, multiple indoor set and part flow arrangement, and described off-premises station includes compressor, and described part flow arrangement includes first and changes Hot device, the second heat exchanger and supercool branch road valve component, the outlet of the first heat exchange stream of described First Heat Exchanger and described the The entrance of the first heat exchange stream of two heat exchangers is connected, and described supercool branch road valve component is arranged on described second heat exchanger Between the outlet of the first heat exchange stream and the entrance of the second heat exchange stream of described second heat exchanger, the of described second heat exchanger The outlet of two heat exchange streams is connected with the entrance of the second heat exchange stream of described First Heat Exchanger, and the of described First Heat Exchanger The outlet of two heat exchange streams is connected with described off-premises station, described supercool branch road valve component include first throttle element and with institute State the first control valve of first throttle element in parallel, the method comprising the steps of:

Judge the present mode of operation of described multiple on-line system；

If the present mode of operation of described multiple on-line system is pure refrigeration mode, according to described supercool branch road valve component Before valve, the degree of superheat in the exit of the second heat exchange stream of degree of supercooling and described First Heat Exchanger judges described supercool branch road valve body Whether assembly breaks down；And

If the present mode of operation of described multiple on-line system is pure heating mode, according to the discharge superheat of described compressor Judge whether described supercool branch road valve component breaks down.

2. in multiple on-line system as claimed in claim 1 supercool branch road valve component fault detection method it is characterised in that The outlet of the second heat exchange stream of degree of supercooling and described First Heat Exchanger before the described valve according to described supercool branch road valve component The degree of superheat at place judges whether described supercool branch road valve component breaks down, comprising:

If degree of supercooling is more than the first default degree of supercooling and described First Heat Exchanger before the valve of described supercool branch road valve component The degree of superheat in the exit of the second heat exchange stream is more than the first default degree of superheat, then control described supercool branch road valve component to carry out Open big regulation, and judge the second heat exchange of degree of supercooling and described First Heat Exchanger before the valve of described supercool branch road valve component again The degree of superheat in the exit of stream；

If degree of supercooling is persistently more than the first default degree of supercooling before the valve of described supercool branch road valve component in the first Preset Time And the degree of superheat in the exit of the second heat exchange stream of described First Heat Exchanger is persistently more than the first default degree of superheat, then judge institute State supercool branch road valve body component failure.

3. in multiple on-line system as claimed in claim 2 supercool branch road valve component fault detection method it is characterised in that After judging described supercool branch road valve body component failure, also include:

Described first throttle element and described first control valve is controlled to be turned off, and after described multiple on-line system stable operation, Control described first control valve to open, and control described first throttle element to remain off；

The reduction amount judging the degree of superheat in exit of the second heat exchange stream of described First Heat Exchanger in the second Preset Time is Whether the reduction amount of the no discharge superheat being less than the first preset value or described compressor is less than the second preset value；

If the reduction of the degree of superheat in exit of the second heat exchange stream of described First Heat Exchanger in described second Preset Time Amount is less than described second preset value less than the reduction amount of described first preset value or the discharge superheat of described compressor, then Judge that described first control valve breaks down.

4. in multiple on-line system as claimed in claim 2 or claim 3 supercool branch road valve component fault detection method, its feature exists In, after judging described supercool branch road valve body component failure, also including:

Described first throttle element and described first control valve is controlled to be turned off, and after described multiple on-line system stable operation, Control described first throttle element to open to default maximum opening, and control described first control valve to remain off；

The reduction amount judging the degree of superheat in exit of the second heat exchange stream of described First Heat Exchanger in the 3rd Preset Time is Whether the reduction amount of the no discharge superheat being less than the 3rd preset value or described compressor is less than the 4th preset value；

If the reduction of the degree of superheat in exit of the second heat exchange stream of described First Heat Exchanger in described 3rd Preset Time Amount is less than described 4th preset value less than the reduction amount of described 3rd preset value or the discharge superheat of described compressor, then Judge described first throttle element failure.

5. in multiple on-line system as claimed in claim 1 supercool branch road valve component fault detection method it is characterised in that The described discharge superheat according to described compressor judges whether described supercool branch road valve component breaks down, comprising:

If the difference between the discharge superheat of described compressor and the target exhaust degree of superheat is more than the 5th preset value, control The aperture of described supercool branch road valve component becomes big；

Judge that in the 4th Preset Time, the difference between the discharge superheat of described compressor and the described target exhaust degree of superheat is No be more than the 6th preset value, and judge whether the variable quantity of the discharge superheat of described compressor is less than the 7th preset value；

If the difference between the discharge superheat of described compressor and the described target exhaust degree of superheat in described 4th Preset Time Value is more than described 6th preset value and the variable quantity of the discharge superheat of described compressor is less than described 7th preset value, then judge Described supercool branch road valve body component failure.

6. in multiple on-line system as claimed in claim 5 supercool branch road valve component fault detection method it is characterised in that After judging described supercool branch road valve body component failure, also include:

Described first throttle element is controlled to keep the first default aperture constant, and after described multiple on-line system stable operation, control Make described first control valve to open；

Judge whether the reduction amount of the discharge superheat of described compressor in the 5th Preset Time is less than the 8th preset value；

If the reduction amount of the discharge superheat of described compressor is less than described 8th preset value in described 5th Preset Time, Judge that described first control valve breaks down.

7. in the multiple on-line system as described in claim 5 or 6 supercool branch road valve component fault detection method, its feature exists In, after judging described supercool branch road valve body component failure, also including:

Control described first throttle element to open to default maximum opening, and control described first control valve to remain off；

Judge whether the reduction amount of the discharge superheat of described compressor in the 6th Preset Time is less than the 9th preset value；

If it is determined that the reduction amount of the discharge superheat of described compressor is preset less than the described 9th in described 6th Preset Time Value, then judge described first throttle element failure.

8. a kind of multiple on-line system is it is characterised in that include:

Off-premises station, described off-premises station includes compressor；

Multiple indoor sets；

Part flow arrangement, described part flow arrangement includes First Heat Exchanger, the second heat exchanger and supercool branch road valve component, and described first The outlet of the first heat exchange stream of heat exchanger is connected with the entrance of the first heat exchange stream of described second heat exchanger, described supercool The outlet that branch road valve component is arranged on the first heat exchange stream of described second heat exchanger is changed with the second of described second heat exchanger Between the entrance of hot flowpath, second heat exchange exporting with described First Heat Exchanger of the second heat exchange stream of described second heat exchanger The entrance of stream is connected, and the outlet of the second heat exchange stream of described First Heat Exchanger is connected with described off-premises station, described mistake Cold branch road valve component includes first throttle element and the first control valve with described first throttle element in parallel；

Control module, described control module is used for judging the present mode of operation of described multiple on-line system, wherein, if described many The present mode of operation of on-line system is pure refrigeration mode, the described control module then valve according to described supercool branch road valve component The degree of superheat in the exit of the second heat exchange stream of front degree of supercooling and described First Heat Exchanger judges described supercool branch road valve body group Whether part breaks down；If the present mode of operation of described multiple on-line system is pure heating mode, described control module then root Judge whether described supercool branch road valve component breaks down according to the discharge superheat of described compressor.

9. multiple on-line system as claimed in claim 8 is it is characterised in that described control module is according to described supercool branch road valve body Before the valve of assembly, the degree of superheat in the exit of the second heat exchange stream of degree of supercooling and described First Heat Exchanger judges described supercool When whether road valve component breaks down, wherein,

If degree of supercooling is more than the first default degree of supercooling and described First Heat Exchanger before the valve of described supercool branch road valve component The degree of superheat in the exit of the second heat exchange stream is more than the first default degree of superheat, and described control module then controls described supercool branch road Valve component carries out out big regulation, and judges degree of supercooling and described first heat exchange before the valve of described supercool branch road valve component again The degree of superheat in the exit of the second heat exchange stream of device；

If degree of supercooling is persistently more than the first default degree of supercooling before the valve of described supercool branch road valve component in the first Preset Time And the degree of superheat in the exit of the second heat exchange stream of described First Heat Exchanger is persistently more than the first default degree of superheat, described control Module then judges described supercool branch road valve body component failure.

10. multiple on-line system as claimed in claim 9 is it is characterised in that described control module is judging described supercool branch road After valve component breaks down, described first throttle element and described first control valve is also controlled to be turned off, and described many After on-line system stable operation, control described first control valve to open, and control described first throttle element to remain off, And judge that the reduction amount of the degree of superheat in exit of the second heat exchange stream of described First Heat Exchanger in the second Preset Time is Whether the reduction amount of the no discharge superheat being less than the first preset value or described compressor is less than the second preset value, wherein,

If the reduction of the degree of superheat in exit of the second heat exchange stream of described First Heat Exchanger in described second Preset Time Amount is less than described second preset value, institute less than the reduction amount of described first preset value or the discharge superheat of described compressor State control module and then judge that described first control valve breaks down.

11. multiple on-line system as described in claim 9 or 10 are it is characterised in that described control module is supercool as described in judgement After branch road valve body component failure, described first throttle element and described first control valve is also controlled to be turned off, and in institute After stating multiple on-line system stable operation, control described first throttle element to open to default maximum opening, and control described first Control valve remains off, and judges the exit of the second heat exchange stream of described First Heat Exchanger in the 3rd Preset Time The reduction amount of the degree of superheat whether whether be less than less than the reduction amount of the 3rd preset value or the discharge superheat of described compressor 4th preset value, wherein,

If the reduction of the degree of superheat in exit of the second heat exchange stream of described First Heat Exchanger in described 3rd Preset Time Amount is less than described 4th preset value, institute less than the reduction amount of described 3rd preset value or the discharge superheat of described compressor State control module and then judge described first throttle element failure.

12. multiple on-line system as claimed in claim 9 are it is characterised in that described control module is according to the row of described compressor When the gas degree of superheat judges whether described supercool branch road valve component breaks down, wherein,

If the difference between the discharge superheat of described compressor and the target exhaust degree of superheat is more than the 5th preset value, described control Molding block then controls the aperture of described supercool branch road valve component to become big；

Described control module judges the discharge superheat of described compressor and the described target exhaust degree of superheat in the 4th Preset Time Between difference whether be more than the 6th preset value, and judge whether the variable quantity of the discharge superheat of described compressor is less than the 7th Preset value；

If the difference between the discharge superheat of described compressor and the described target exhaust degree of superheat in described 4th Preset Time Value is more than described 6th preset value and the variable quantity of the discharge superheat of described compressor is less than described 7th preset value, described control Molding block then judges described supercool branch road valve body component failure.

13. multiple on-line system as claimed in claim 12 are it is characterised in that described control module is judging described supercool branch road After valve component breaks down, described first throttle element is also controlled to keep the first default aperture constant, and described multi-joint After machine system stable operation, described first control valve is controlled to open, and the row judging described compressor in the 5th Preset Time Whether the reduction amount of the gas degree of superheat is less than the 8th preset value, wherein,

If the reduction amount of the discharge superheat of described compressor is less than described 8th preset value, institute in described 5th Preset Time State control module and then judge that described first control valve breaks down.

14. multiple on-line system as described in claim 12 or 13 are it is characterised in that described control module is supercool as described in judgement After branch road valve body component failure, also control described first throttle element to open to default maximum opening, and control described First control valve remains off, and judges that the reduction amount of the discharge superheat of described compressor in the 6th Preset Time is No be less than the 9th preset value, wherein,

If it is determined that the reduction amount of the discharge superheat of described compressor is preset less than the described 9th in described 6th Preset Time Value, described control module then judges described first throttle element failure.