CN214891984U - Magnetic suspension air conditioning unit - Google Patents
Magnetic suspension air conditioning unit Download PDFInfo
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- CN214891984U CN214891984U CN202120469031.7U CN202120469031U CN214891984U CN 214891984 U CN214891984 U CN 214891984U CN 202120469031 U CN202120469031 U CN 202120469031U CN 214891984 U CN214891984 U CN 214891984U
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Abstract
The utility model relates to an air conditioning technology field specifically provides a magnetic suspension air conditioning unit, aims at solving the slow technical problem of current unit pressure release speed. The magnetic suspension air conditioning unit comprises a pressure relief bypass which is communicated with an exhaust port of a magnetic suspension compressor and an evaporator of the magnetic suspension air conditioning unit or is communicated with the exhaust port and an air suction port of the magnetic suspension compressor and is used for relieving pressure of the magnetic suspension centrifugal compressor, and the pressure relief bypass comprises a pressure relief switch valve and a pressure relief throttling element which are arranged in parallel. Compared with the prior art that the pressure is simply relieved through an electronic expansion valve, the pressure relief device can utilize the throttling and pressure reducing functions of the throttling element and the switching value characteristic of the pressure relief switching element, has obvious instantaneous pressure relief effect after being turned on, can compensate the defect that the pressure relief of the throttling element is influenced by time, enables the pressure ratio to quickly reach the allowable shutdown pressure ratio threshold of the magnetic suspension centrifugal compressor, is particularly important for emergency fault unloading shutdown, and improves the shutdown safety and reliability of the magnetic suspension centrifugal compressor.
Description
Technical Field
The utility model belongs to the technical field of the air conditioner, specifically provide a magnetic suspension air conditioning unit.
Background
With the continuous development of science and technology, the magnetic suspension air conditioning unit becomes a very common air conditioning unit.
The core technology of the magnetic suspension air conditioning unit lies in a magnetic suspension centrifugal compressor adopted by the unit, the magnetic suspension centrifugal compressor generally comprises a rotating shaft, a magnetic bearing, a standby bearing and a positioning sensor, and the rotating shaft can be suspended above the magnetic bearing and generate high-speed rotation to improve the gas flow rate; when the rotating shaft stops rotating, the rotating shaft can fall onto the bearing, so that the bearing can support the rotating shaft which stops rotating; the positioning sensor can detect the position of the rotating shaft in real time so as to effectively judge whether the rotating shaft deviates from the original rotating center in the rotating process. When an existing magnetic suspension air conditioning unit receives a stop instruction, a magnetic suspension centrifugal compressor is usually stopped immediately, although the process of stopping the rotation of a rotating shaft usually needs to take several seconds; however, the gas on the high pressure side flows in the opposite direction under the action of pressure, the acting force applied to the rotating shaft of the compressor exceeds the supporting force provided by the magnetic bearings, the rotating shaft does not stop rotating, and the rotating shaft rotating at high speed causes great impact on the bearings, so that the bearings are easily damaged. Particularly, when the pressure ratio of the magnetic suspension centrifugal compressor is high during the shutdown, the surging phenomenon of the magnetic suspension centrifugal compressor is easily caused by suddenly reducing the rotating speed of the rotating shaft, so that the rotating shaft continuously impacts the bearing, and the bearing is damaged.
Therefore, the chinese patent publication No. CN109855338A discloses an air-cooled magnetic suspension centrifugal unit, which is provided with a pressure release valve, and the pressure release valve 6 is connected in parallel with the magnetic suspension centrifugal compressor 1 and the evaporator 5, so that the pressure ratio of the magnetic suspension centrifugal compressor 1 can be reduced when the pressure release valve 6 is opened, thereby achieving the pressure release effect, referring to paragraph [ 0024 ] of the specification and attached drawing 1. Further, referring to paragraphs [ 0026 ] to [ 0036 ] of the specification, the patent document of the invention also discloses a shutdown control method of the air-cooled magnetic suspension centrifugal machine set, which mainly comprises the following steps: s1: after a shutdown instruction is received, the magnetic suspension centrifugal compressor is decompressed; s2: acquiring the pressure ratio of the magnetic suspension centrifugal compressor within a first preset time; s3: and enabling the magnetic suspension centrifugal compressor to enter a corresponding shutdown mode according to the pressure ratio of the magnetic suspension centrifugal compressor within the first preset time.
Although this patent document discloses a method of reducing the pressure ratio of the compressor by a pressure relief valve, it does not clearly indicate which pressure relief valve is used and how to relieve the pressure. Therefore, the chinese patent publication No. CN108954650B also discloses a control method for an air-cooled magnetic levitation air conditioner, in which a bypass electronic expansion valve is connected in series between the exhaust port of the magnetic levitation centrifugal compressor and the evaporator, so as to adjust the pressure ratio of the air conditioning unit through the bypass electronic valve.
However, the electronic expansion valve is opened linearly, the unloading of the electronic expansion valve is greatly influenced by time, and the problem that the pressure ratio cannot be quickly adjusted to a stop condition due to the slow pressure ratio adjusting speed exists. Normally, the pressure relief speed of the unit is increased by selecting a larger electronic expansion valve, but the measure increases the manufacturing cost of the unit.
In view of the above, a need exists for a new way for solving the technical problem of slow pressure release speed of the existing magnetic suspension air conditioning unit.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem that the pressure release speed of the existing magnetic suspension air conditioning unit is slow, the utility model provides a magnetic suspension air conditioning unit.
The utility model discloses a magnetic suspension air conditioning unit includes the pressure release bypass, the pressure release bypass intercommunication the gas vent of magnetic suspension compressor with the evaporimeter of magnetic suspension air conditioning unit, perhaps intercommunication the gas vent and the induction port of magnetic suspension compressor are used for giving magnetic suspension air conditioning unit's magnetic suspension centrifugal compressor pressure release, the pressure release bypass is including parallelly connected pressure release switch valve and the pressure release throttling element who sets up.
In an embodiment of the above magnetic suspension air conditioning unit, the pressure relief switch valve is an electromagnetic switch valve.
In an embodiment of the above magnetic suspension air conditioning unit of the present invention, the pressure relief throttling element is an electronic expansion valve.
In an optimized scheme of the magnetic suspension air conditioning unit of the utility model, the magnetic suspension air conditioning unit further comprises an economizer and an economizer side throttling element; the economizer is provided with a first path of refrigerant flow channel and a second path of refrigerant flow channel which are arranged in parallel; the refrigerant inlet of the first path of refrigerant flow channel is communicated with the refrigerant outlet of the condenser of the magnetic suspension air conditioning unit, and the refrigerant outlet of the first path of refrigerant flow channel is communicated with the refrigerant inlet of the evaporator of the magnetic suspension air conditioning unit through a main path throttling element of the magnetic suspension air conditioning unit; the refrigerant inlet of the second refrigerant flow channel is communicated with the refrigerant outlet of the condenser through the economizer side throttling element connected in series to the parallel branch, and the refrigerant outlet of the second refrigerant flow channel is communicated with the gas cooling port of the magnetic suspension centrifugal compressor.
The utility model discloses an among the preferred scheme of above-mentioned magnetic suspension air conditioning unit, magnetic suspension air conditioning unit still includes the cooling bypass, the cooling bypass intercommunication magnetic suspension centrifugal compressor's liquid cooling mouth with magnetic suspension air conditioning unit's condenser.
In an embodiment of the above magnetic levitation air conditioning unit of the present invention, the cooling bypass includes a cooling switch element and a cooling filter connected in series.
The utility model discloses an among the preferred scheme of above-mentioned magnetic suspension air conditioning unit, magnetic suspension air conditioning unit still includes the one-way bypass that switches on, the one-way bypass one-way switch on magnetic suspension centrifugal compressor's gas vent with the refrigerant entry of magnetic suspension air conditioning unit's condenser.
The utility model discloses an among the preferred scheme of above-mentioned magnetic suspension air conditioning unit, the one-way bypass that switches on includes the check valve, the check valve allows the refrigerant to follow magnetic suspension centrifugal compressor's gas vent flow direction the refrigerant entry of condenser.
The utility model discloses an among the above-mentioned magnetic suspension air conditioning unit's an preferred scheme, magnetic suspension air conditioning unit's condenser is water-cooled condenser, air-cooled condenser or evaporative condenser.
In an optimized scheme of the above-mentioned magnetic suspension air conditioning unit of the utility model, the evaporimeter of magnetic suspension air conditioning unit is water-cooling evaporimeter or air-cooled evaporimeter.
The utility model discloses a magnetic suspension air conditioning unit includes the pressure release bypass, and the gas vent of pressure release bypass intercommunication magnetic suspension compressor and magnetic suspension air conditioning unit's evaporimeter perhaps communicate the gas vent and the induction port of magnetic suspension compressor for give the pressure release bypass of magnetic suspension centrifugal compressor pressure release, the pressure release bypass is including parallelly connected pressure release ooff valve and the pressure release throttling element that sets up.
Compare with the simple electronic expansion valve pressure release that passes through among the prior art, if when the same refrigerating output of bypass, the utility model discloses a ooff valve pressure release is with low costs and has very big price advantage. In addition, electronic expansion valve is the linear opening, its pressure release is influenced by the time comparatively greatly, the pressure release is slow, and the utility model discloses a parallelly connected pressure release switch valve of pressure release bypass and pressure release throttling element, can utilize throttling element's throttle step-down function, can utilize the switching value characteristic of pressure release switch valve again, it is obvious to open the instantaneous pressure release effect in back, can compensate throttling element pressure release and receive the not enough of time influence, make the pressure ratio reach magnetic suspension centrifugal compressor fast and allow to shut down the pressure ratio threshold value, this point is important to emergency trouble uninstallation shut down, can improve the security and the reliability that magnetic suspension centrifugal compressor shut down, reduce the risk that magnetic suspension centrifugal compressor's bearing damaged.
Drawings
Fig. 1 is a schematic structural diagram of a first specific embodiment of a magnetic levitation air conditioning unit according to the present invention;
fig. 2 is a schematic structural diagram of a second embodiment of the magnetic levitation air conditioning unit of the present invention.
In fig. 1 and 2, the one-to-one correspondence between the names and reference numbers of the respective components is as follows:
1, a magnetic suspension centrifugal compressor;
2 condenser, 2iCooling water inlet, 2oA cooling water outlet;
evaporator, 3iChilled water inlet, 3oA chilled water outlet;
4 a main path throttling element;
5, an economizer: 5a refrigerant inlet of a first refrigerant channel, 5b a refrigerant inlet of a second refrigerant channel, 5c a refrigerant outlet of the first refrigerant channel, 5d a refrigerant outlet of the second refrigerant channel, 51 economizer side throttling element, 52 economizer side pressure sensor and 53 economizer side temperature sensor;
6 drying the filter;
7, pressure relief bypass: 70 a pressure relief throttling element, 71 a pressure relief switching element;
8, a one-way valve;
90 cool the on-off valve, 91 cool the filter.
Detailed Description
Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In order to facilitate understanding of the magnetic levitation air conditioning unit of the present invention, the following takes a water-cooling magnetic levitation air conditioning unit as an example with reference to fig. 1 and 2, and first, the main structure and the operation principle of this type of air conditioning unit will be described in detail. Wherein, fig. 1 is the structure schematic diagram of the first embodiment of the magnetic suspension air conditioning unit of the present invention, and fig. 2 is the structure schematic diagram of the second embodiment of the magnetic suspension air conditioning unit of the present invention. In fig. 1 and 2, solid arrows "→" represent the refrigerant flow direction of the air conditioning unit, and broken arrows
Representing the flow direction of the cooling water and the chilled water of the air conditioning unit.
The first embodiment:
referring to fig. 1, in the present embodiment, the water-cooled magnetic levitation air conditioning unit at least includes a magnetic levitation centrifugal compressor 1, a condenser 2, an evaporator 3, and a main path throttling element 4. The magnetic suspension centrifugal compressor 1, the condenser 2, the main path throttling element 4 and the evaporator 3 are sequentially connected in an end-to-end mode through pipelines to form a refrigerant main circulation loop.
As mentioned above, the condenser 2 in this embodiment is a water-cooled condenser 2, two heat exchange medium channels are provided in the water-cooled condenser 2, and the media in the two heat exchange medium channels exchange heat with each other when there is a temperature difference. One path of the two paths of heat exchange medium channels is a refrigerant channel, and the other path of the two paths of heat exchange medium channels is a cooling water channel, wherein the refrigerant channel is provided with a refrigerant inlet and a refrigerant outlet which are communicated with the main path pipeline, and the cooling water channel is provided with a cooling water inlet 2 which is communicated with an external cooling water circulation pipelineiAnd a cooling water outlet 2o。
It will be appreciated that the condenser 2 may be an air cooled condenser or an evaporative cold condenser. Of course, the specific type of condenser used depends on the usage scenario of the air conditioning unit and the timing requirements of the user.
With reference to fig. 1, the evaporator 3 in this embodiment is a water-cooled evaporator 3, the water-cooled evaporator 3 also has two medium channels, and the media in the two medium channels can exchange heat with each other when there is a temperature difference. One of the two medium channels is a refrigerant channel, the other is a chilled water channel, wherein the refrigerant channel is provided with a refrigerant inlet and a refrigerant outlet which are communicated with the main pipeline, and the chilled water channel is provided with a chilled water inlet 3 which is communicated with an external chilled water circulation pipelineiAnd a chilled water outlet 3o。
It will be appreciated that the evaporator 3 may be an air cooled evaporator. The air-cooled evaporator is used for exchanging heat of heat dissipated by a refrigerant in the evaporator with air in a space where the evaporator is located under the action of external power such as a fan and the like. Of course, the specific type of evaporator used depends on the usage scenario of the air conditioning unit and the timing requirements of the user.
The refrigerant inlet of the condenser 2 is communicated with the exhaust port of the magnetic suspension centrifugal compressor 1 through a main path pipeline and other auxiliary elements, the refrigerant outlet of the condenser is communicated with the refrigerant inlet of the evaporator 3 through the main path pipeline, the main path throttling element 4 and other auxiliary elements, and the refrigerant outlet of the evaporator 3 is communicated with the air suction port of the magnetic suspension centrifugal compressor 1 through the main path pipeline and other auxiliary elements.
The working principle of a main circulation loop of the magnetic suspension air conditioning unit is as follows: starting the external cooling water circulation loop and the chilled water circulation loop, under the action of the circulation power provided by the external power element, cooling water enters the cooling water channel from the cold water inlet of the condenser 2, and chilled water enters the chilled water channel from the chilled water inlet 3 of the evaporator 3iEntering a chilled water channel; meanwhile, the magnetic suspension centrifugal compressor 1 is started, the low-temperature and low-pressure gaseous refrigerant enters the magnetic suspension centrifugal compressor 1, is compressed by the magnetic suspension centrifugal compressor 1, forms the high-temperature and high-pressure gaseous refrigerant, enters a refrigerant channel of the condenser 2, exchanges heat with cooling water in the cooling water channel to release heat and cool, and forms medium temperatureHigh-pressure liquid refrigerant, cooling water absorbs heat and rises temperature, and then the refrigerant is discharged from a cooling water outlet 2oReturning to the external cooling water circulation pipeline, the medium-temperature high-pressure liquid refrigerant is throttled and depressurized by the main path throttling element 4 to form a low-temperature low-pressure two-phase mixed refrigerant, the low-temperature low-pressure two-phase mixed refrigerant enters the refrigerant channel of the evaporator 3, the low-temperature low-pressure two-phase mixed refrigerant exchanges heat with the frozen water in the frozen water channel to absorb heat and raise the temperature to form a low-temperature low-pressure gaseous refrigerant, the low-temperature low-pressure gaseous refrigerant returns to the magnetic suspension centrifugal compressor 1 from the air suction port, the frozen water releases heat and is cooled, and then the temperature of the frozen water is reduced from the frozen water outlet 3oAnd returning the refrigerant to the external chilled water circulation loop, and circulating to provide heated cooling water or cooled chilled water for a user.
As described in the background art, the magnetic levitation air conditioning unit usually stops the magnetic levitation centrifugal system immediately when receiving a shutdown command, although the process of stopping the rotation of the rotating shaft usually takes several seconds; however, the gas at the high pressure side flows reversely under the action of pressure, the acting force applied to the rotating shaft of the magnetic suspension centrifugal compressor 1 exceeds the supporting force provided by the magnetic bearing, the rotating shaft usually does not stop rotating, and the rotating shaft rotating at high speed can cause great impact to the bearing, so that the bearing is easily damaged; particularly, when the pressure ratio of the magnetic suspension centrifugal compressor 1 is high during the shutdown, the rapid reduction of the rotation speed of the rotating shaft easily causes the magnetic suspension centrifugal compressor 1 to generate a surge phenomenon, so that the rotating shaft continuously impacts the bearing, and the bearing is damaged.
Therefore, in the embodiment, the pressure relief bypass 7 is additionally arranged in the magnetic suspension air conditioning unit so as to quickly relieve the pressure of the unit when the pressure ratio of the magnetic suspension centrifugal compressor 1 is high, so that the pressure ratio of the magnetic suspension centrifugal compressor 1 quickly reaches a threshold value of a permissible shutdown pressure ratio, and then the risk of bearing damage caused by shutdown of the magnetic suspension centrifugal compressor 1 is reduced.
In detail, with continued reference to fig. 1, the pressure relief bypass 7 includes a pressure relief switching element 71 and a pressure relief throttling element 70 arranged in parallel, and the pressure relief bypass 7 communicates the exhaust port of the magnetically levitated centrifugal compressor 1 and the evaporator 3, and the pressure relief bypass 7 is used for relieving the pressure of the magnetically levitated centrifugal compressor 1.
The following describes in detail a specific method of using the magnetic levitation air conditioning unit:
when the magnetic suspension air conditioning unit meets the shutdown condition, acquiring the current pressure ratio of the magnetic suspension centrifugal compressor 1;
it should be noted that the magnetic suspension air conditioning unit meets the shutdown conditions including water temperature shutdown, active shutdown, unit alarm fault shutdown and the like.
Further, the pressure ratio of the magnetic levitation centrifugal compressor 1 described herein refers to a suction-discharge absolute pressure ratio, which is a ratio of an outlet discharge pressure (absolute pressure) to an inlet suction pressure (absolute pressure) of the magnetic levitation centrifugal compressor 1. In general, the outlet discharge pressure of the magnetic suspension centrifugal compressor 1 is obtained by a pressure sensor arranged at the outlet, the inlet suction pressure of the magnetic suspension centrifugal compressor is obtained by a pressure sensor arranged at the inlet, and the two pressure sensors are in communication connection with a controller of the magnetic suspension air conditioning unit so as to transmit the collected discharge pressure and suction pressure to the controller, and a calculation module in the controller calculates the current pressure ratio. The allowable shutdown pressure ratio threshold value refers to a pressure ratio preset in a controller of the magnetic suspension air conditioning unit, and when the current pressure ratio of the magnetic suspension centrifugal compressor 1 is smaller than or equal to the allowable shutdown pressure ratio threshold value, the magnetic suspension centrifugal compressor 1 is directly controlled to be shut down, so that a bearing of the magnetic suspension centrifugal compressor is not damaged.
And judging whether the current pressure ratio of the magnetic suspension centrifugal compressor 1 is greater than the threshold value of the allowable shutdown pressure ratio.
When the current pressure ratio of the magnetic suspension centrifugal compressor 1 is greater than the threshold value of the allowable shutdown pressure ratio, keeping the magnetic suspension centrifugal compressor 1 running for a preset time in the current state; and when the current pressure ratio of the magnetic suspension centrifugal compressor 1 is less than or equal to the allowable shutdown pressure ratio threshold value, controlling the magnetic suspension centrifugal compressor 1 to be shut down.
After the magnetic suspension centrifugal compressor 1 works in the current state for a preset time, whether the current pressure ratio of the magnetic suspension centrifugal compressor 1 is larger than the threshold value of the allowable shutdown pressure ratio is judged again.
If the current pressure ratio of the magnetic suspension centrifugal compressor 1 is still larger than the threshold value of the allowable shutdown pressure ratio after the second judgment, it indicates that the current pressure ratio of the magnetic suspension centrifugal compressor 1 is relatively constant and larger than the threshold value of the allowable shutdown pressure ratio and is not an instantaneous sudden fluctuation value, and at this time, the pressure relief switch valve 71 and the pressure relief throttling element 70 are opened to relieve the pressure of the magnetic suspension centrifugal compressor 1.
And after the judgment again, if the current pressure ratio of the magnetic suspension centrifugal compressor 1 is less than or equal to the threshold value of the allowable shutdown pressure ratio, the current pressure ratio is only an instantaneous sudden fluctuation value, and then the magnetic suspension centrifugal compressor 1 is confirmed to enter the minimum capacity maintaining state. The minimum capacity keeping state of the magnetic suspension centrifugal compressor 1 is that the minimum load which cannot surge of the magnetic suspension centrifugal compressor 1 is calculated in real time according to the running state, so that the magnetic suspension centrifugal compressor 1 is assigned, namely the magnetic suspension centrifugal compressor 1 enters the minimum capacity keeping state, the magnetic suspension centrifugal compressor 1 is operated at the lowest frequency, the running pressure ratio is reduced conveniently, the magnetic suspension centrifugal compressor 1 is stopped directly at the moment, the magnetic suspension centrifugal compressor 1 cannot be damaged too much, and therefore the magnetic suspension centrifugal compressor 1 is controlled to stop directly.
It should be noted that, the magnetic levitation centrifugal compressor 1 is kept running in the current state for a preset time, the specific time is short, and usually 1s (second) to 3s (second), and the specific value depends on performance parameters such as power of the magnetic levitation centrifugal compressor 1, which can be preset by a person skilled in the art according to actual conditions.
That is, in this embodiment, the pressure relief switch element 71 and the pressure relief throttling element 70 are simultaneously turned on, and the pressure relief effect can be rapidly achieved by simultaneously relieving the pressure.
In step S1, the opening degree of the pressure-releasing restriction element 70 is the maximum, that is, the opening degree of the pressure-releasing restriction element is 100%.
Then, it is determined whether the on time of the pressure release switch element 71 reaches a first preset time.
The setting of the first preset time period is adjusted according to the test time situation, the adjustment principle is that the pressure ratio is obviously reduced in the first preset time period, and the pressure ratio is relatively slowly reduced after the first preset time period is exceeded, and the adjustment principle can be set by a person skilled in the art according to the adjustment principle. For example, the first preset time period may be preferably 2s (seconds).
And if the opening time of the pressure relief switch element 71 reaches a first preset time, directly controlling the magnetic suspension centrifugal compressor 1 to stop no matter the current pressure ratio of the magnetic suspension centrifugal compressor 1 is less than or equal to the threshold value of the allowable stop pressure ratio.
And if the opening time of the pressure relief switch element 71 does not reach the first preset time, returning to the step of judging whether the current pressure ratio is greater than the threshold value of the allowable shutdown pressure ratio again.
When the magnetic suspension centrifugal compressor 1 is controlled to stop, the magnetic suspension air conditioning unit does not directly close the pressure relief switch element 71, but keeps the pressure relief switch valve open for a second preset time, and then closes the pressure relief switch element 71.
In the embodiment, the purpose of keeping the pressure relief switch valve open for the second preset time before closing the pressure relief switch valve is that the magnetic suspension centrifugal compressor 1 stops sending out the instruction, because the magnetic suspension centrifugal compressor 1 and the PLC directly have communication time, and in addition, the magnetic suspension centrifugal compressor 1 also has response confirmation inside, that is, the magnetic suspension centrifugal compressor 1 can execute the stop action after the controller sends out the stop instruction of the magnetic suspension centrifugal compressor 1 and delays for a certain time. Therefore, after the magnetic suspension air conditioning unit of this embodiment controls the magnetic suspension centrifugal compressor 1 to stop, the pressure relief switch element 71 is turned off after delaying the second preset time to compensate the lag time of the magnetic suspension centrifugal compressor 1 responding to the stop action, so as to ensure that the pressure relief switch element 71 is turned off after the magnetic suspension centrifugal compressor 1 actually stops.
Compared with the prior art in which pressure is simply released through an electronic expansion valve, if the bypass has the same refrigerating capacity, the magnetic suspension air conditioning unit of the embodiment adopts the switch valve to release pressure, so that the cost is low, and the magnetic suspension air conditioning unit has a great price advantage. In addition, the electronic expansion valve is linearly opened, the pressure relief is greatly influenced by time, the pressure relief speed is low, the pressure relief bypass 7 of the magnetic suspension air conditioning unit of the embodiment is connected with the pressure relief switch element 71 and the pressure relief throttling element 70 in parallel, the throttling and pressure reducing functions of the throttling element can be utilized, the switching value characteristic of the pressure relief switch element 71 can be utilized, the instant pressure relief effect is obvious after the magnetic suspension air conditioning unit is opened, the defect that the pressure relief of the throttling element is influenced by time can be compensated, the pressure ratio can quickly reach the threshold value of the allowable shutdown pressure ratio of the magnetic suspension centrifugal compressor 1, the point is particularly important for unloading shutdown in emergency faults, the shutdown safety and reliability of the magnetic suspension centrifugal compressor 1 can be improved, and the risk of bearing damage of the magnetic suspension centrifugal compressor 1 can be reduced.
With continued reference to fig. 1, the maglev air conditioning unit of the present embodiment includes, in addition to the indispensable functional elements of the maglev centrifugal compressor 1, the condenser 2, the main path throttling element 4 and the evaporator 3, other auxiliary elements, the names of which, the connection relationship with other main functional elements, and the functions thereof will be described in detail below with reference to fig. 1.
With continued reference to fig. 1, the maglev air conditioning unit of the present embodiment further includes an economizer 5 and an economizer-side throttling element 51. The economizer 5 has two refrigerant channels connected in parallel, namely a first refrigerant channel and a second refrigerant channel. A refrigerant inlet 5a of the first path of refrigerant flow channel is communicated with a refrigerant outlet of the condenser 2 through a drying filter 6, and a refrigerant outlet 5c of the first path of refrigerant flow channel is communicated with a refrigerant inlet of the evaporator 3 through a main path throttling element 4; the refrigerant inlet 5b of the second refrigerant flow channel and the dry filter 6 (it should be noted that, here, the dry filter 6 is used for drying and filtering the refrigerant to reduce the content of moisture and impurities entering the economizer 50, and those skilled in the art can omit the dry filter 6 according to the actual application scenario) are communicated through the economizer side throttling element 51 connected in series to the parallel branch, and the refrigerant outlet 5d of the second refrigerant flow channel and the gas cooling port of the magnetic suspension centrifugal compressor 1 are communicated through the economizer side temperature sensor 53 and the economizer side pressure sensor 52 connected in series.
The purpose of additionally arranging the cooling branch bypass is to divide a refrigerant from the condenser 2 into two paths, wherein one path still belongs to a main circulation loop, enters a main path throttling element 4 for throttling and pressure reduction after drying and filtering treatment, and then enters the evaporator 3, and the other path forms a cooling bypass, namely, directly enters the magnetic suspension centrifugal compressor 1 through a gas cooling port of the magnetic suspension centrifugal compressor 1 for cooling functional elements in the magnetic suspension centrifugal compressor 1 after being throttled and pressure reduced by an economizer side throttling element 51.
The amount of refrigerant entering the magnetic levitation centrifugal compressor 1 from the cooling bypass depends on the opening of the economizer-side throttling element 51, the opening of the economizer-side throttling element 51 is determined by the temperature and pressure at the cooling port of the magnetic levitation centrifugal compressor 1, and the temperature and pressure at the cooling port of the magnetic levitation centrifugal compressor 1 are respectively collected by the economizer-side pressure sensor 52 and transmitted to the controller of the air conditioning unit by the economizer-side temperature sensor 53. It can be understood that, in the case of adjusting the opening degree of the economizer-side throttling element 51 by other conventional methods, the second refrigerant outlet 5d of the second refrigerant flow channel and the gas cooling port of the magnetically levitated centrifugal compressor 1 can be directly communicated through a pipeline.
With continuing reference to fig. 1, the magnetic levitation air conditioning unit of the present embodiment further includes another cooling bypass, where the cooling bypass includes a cooling switching element 90 and a cooling filter 91 connected in series, a liquid cooling port of the magnetic levitation centrifugal compressor 1 is communicated with the condenser 2 through the cooling bypass, and when the cooling switching element 90 is turned on, functional elements in the magnetic levitation centrifugal compressor 1 can be cooled by using a liquid refrigerant in the condenser 2.
With continued reference to fig. 1, the magnetically levitated air conditioning assembly further comprises a one-way conduction bypass which one-way conducts the air outlet of the magnetically levitated centrifugal compressor 1 and the refrigerant inlet of the condenser 2, preferably the one-way conduction bypass comprises a one-way valve 8, the one-way valve 8 allowing the refrigerant to flow from the refrigerant outlet of the magnetically levitated centrifugal compressor 1 to the refrigerant inlet of the condenser 2. It can be understood that the method for implementing the one-way conduction function of the one-way conduction bypass is not limited to the one-way valve, and other manners adopted by those skilled in the art also fall within the scope of the present invention.
After the one-way conduction bypass is arranged, in the shutdown operation stage of the magnetic suspension centrifugal compressor 1, after the pressure relief switch element 71 and the pressure relief throttling element 70 are opened for pressure relief, the one-way valve 8 can prevent the problem that the refrigerant flows back from the condenser 2 to the magnetic suspension centrifugal compressor 1 due to the sharp reduction of the pressure ratio, so that the working safety of the air conditioning unit is ensured.
It should be noted that this embodiment is to exemplify the water-cooling magnetic suspension air conditioning unit the utility model discloses a magnetic suspension air conditioning unit, can understand, the utility model discloses a magnetic suspension air conditioning unit is also applicable to air-cooled magnetic suspension air conditioning unit, and condenser 2 is air-cooled condenser and/or evaporimeter for the air-cooled evaporimeter promptly, still is applicable to evaporation cold magnetic suspension air conditioning unit, and condenser 2 is evaporation cold condenser and/or evaporimeter for the evaporation cold evaporimeter promptly.
Finally, it should be emphasized that the main throttle element 4, the pressure relief throttle element 70 and the economizer side throttle element 51 in this embodiment are all electronic expansion valves, and these throttle elements may be other throttle elements such as thermal expansion valves and the like on the basis of satisfying the throttling and pressure reducing functions. The pressure relief switching element 71 is preferably an electromagnetic switching valve.
The second embodiment:
referring to fig. 2, compared with the first embodiment in fig. 1, the only difference between the present embodiment and the first embodiment is the communication manner of the pressure relief bypass, and for clarity and conciseness of description, only the difference between the present embodiment and the first embodiment will be described below with reference to fig. 2, and the same parts between the present embodiment and the first embodiment will not be described again.
The pressure relief bypass is communicated with an exhaust port and an air suction port of the magnetic suspension centrifugal compressor 1.
When the magnetic suspension centrifugal compressor 1 exceeds the allowable shutdown pressure ratio threshold, the pressure relief throttling element and the pressure relief switching element are opened, the high pressure side and the low pressure side of the magnetic suspension centrifugal compressor 1 are conducted, the refrigerant on the high pressure side flows into the low pressure side rapidly, and therefore pressure relief can be provided for the magnetic suspension centrifugal compressor 1.
Finally, it should be emphasized that, although the communication that adopts when describing between two functional components herein, include both that these two functional components advance between through refrigerant pipeline intercommunication, also include that these two functional components pass through refrigerant pipeline and third kind of functional component intercommunication, still include that these two functional components do not communicate through the third kind of functional component directly with the help of refrigerant pipeline, above-mentioned several kinds of situations all fall into the utility model discloses a protection scope.
So far, the technical solution of the present invention has been described with reference to the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, a person skilled in the art can make equivalent changes or substitutions to the related technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.
Claims (10)
1. The utility model provides a magnetic suspension air conditioning unit, includes the pressure release bypass, its characterized in that, the pressure release bypass intercommunication the gas vent of magnetic suspension compressor with the evaporimeter of magnetic suspension air conditioning unit, perhaps intercommunication the gas vent and the induction port of magnetic suspension compressor are used for giving magnetic suspension air conditioning unit's magnetic suspension centrifugal compressor pressure release, the pressure release bypass is including parallelly connected pressure release ooff valve and the pressure release throttling element who sets up.
2. The magnetic levitation air conditioning unit as recited in claim 1, wherein the pressure relief switch valve is an electromagnetic switch valve.
3. The magnetic levitation air conditioning unit as recited in claim 1, wherein the pressure relief throttling element is an electronic expansion valve.
4. The magnetic levitation air conditioning unit as recited in any one of claims 1-3, further comprising an economizer and an economizer-side throttling element;
the economizer is provided with a first path of refrigerant flow channel and a second path of refrigerant flow channel which are arranged in parallel;
the refrigerant inlet of the first path of refrigerant flow channel is communicated with the refrigerant outlet of the condenser of the magnetic suspension air conditioning unit, and the refrigerant outlet of the first path of refrigerant flow channel is communicated with the refrigerant inlet of the evaporator of the magnetic suspension air conditioning unit through a main path throttling element of the magnetic suspension air conditioning unit;
the refrigerant inlet of the second refrigerant flow channel is communicated with the refrigerant outlet of the condenser through the economizer side throttling element connected in series to the parallel branch, and the refrigerant outlet of the second refrigerant flow channel is communicated with the gas cooling port of the magnetic suspension centrifugal compressor.
5. The magnetically levitated air conditioning assembly according to any one of claims 1 to 3, further comprising a cooling bypass communicating a liquid cooling port of the magnetically levitated centrifugal compressor and a condenser of the magnetically levitated air conditioning assembly.
6. Magnetic levitation air conditioning assembly according to claim 5, wherein the cooling bypass comprises a cooling switching element and a cooling filter in series.
7. The magnetic levitation air conditioning unit according to any one of claims 1 to 3, further comprising a one-way conduction bypass, wherein the one-way conduction bypass unidirectionally conducts an exhaust port of the magnetic levitation centrifugal compressor and a refrigerant inlet of a condenser of the magnetic levitation air conditioning unit.
8. The maglev air conditioning unit of claim 7, wherein the one-way bypass comprises a one-way valve that allows refrigerant to flow from an exhaust of the maglev centrifugal compressor to a refrigerant inlet of the condenser.
9. Magnetic levitation air conditioning unit according to any one of claims 1 to 3, characterised in that the condenser of the magnetic levitation air conditioning unit is a water-cooled condenser, an air-cooled condenser or an evaporative cold condenser.
10. Magnetic levitation air conditioning unit as claimed in any one of claims 1 to 3, wherein the evaporator of the magnetic levitation air conditioning unit is a water cooled evaporator or an air cooled evaporator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120469031.7U CN214891984U (en) | 2021-03-04 | 2021-03-04 | Magnetic suspension air conditioning unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120469031.7U CN214891984U (en) | 2021-03-04 | 2021-03-04 | Magnetic suspension air conditioning unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214891984U true CN214891984U (en) | 2021-11-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120469031.7U Active CN214891984U (en) | 2021-03-04 | 2021-03-04 | Magnetic suspension air conditioning unit |
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| Country | Link |
|---|---|
| CN (1) | CN214891984U (en) |
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- 2021-03-04 CN CN202120469031.7U patent/CN214891984U/en active Active
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