SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model aims at providing a cooling water set of many fast compressors has realized promoting the part load efficiency through the many fast compressors of collocation, has advantages such as the reliability is high, with low costs.
In order to achieve the above purpose, the technical scheme of the utility model is realized like this:
a water chilling unit of a multi-speed compressor comprises at least one independent circulation system and a heat exchanger, wherein the independent circulation system is correspondingly matched with 1 multi-speed compressor or a plurality of multi-speed compressors connected in parallel.
Furthermore, a plurality of connecting terminals for changing the effective resistance of the motor winding of the compressor are arranged on the multi-speed compressor.
Further, when the wiring terminals are in two groups, the multi-speed compressor is a two-gear compressor.
Further, when the three groups of wiring terminals are arranged, the multi-speed compressor is a three-gear compressor.
Furthermore, when 4 independent circulating systems are contained, each independent circulating system is correspondingly matched with 1 secondary compressor; each independent circulating system comprises a fan, a condenser, an electronic expansion valve, a four-way valve, a two-stage compressor and a vapor-liquid separator, wherein the fan is used for conveying air volume, an exhaust port of the two-stage compressor is connected with a D port of the four-way valve, a return air port of the two-stage compressor is connected with an outlet of the vapor-liquid separator, an inlet of the vapor-liquid separator is connected with an S port of the four-way valve, a C port of the four-way valve is connected with one end of the condenser, the other end of the condenser is connected with one end of the electronic.
Furthermore, when the compressor comprises 2 independent circulating systems, and each independent circulating system is correspondingly matched with 2 parallel secondary compressors; each independent circulating system comprises a fan, a condenser, an electronic expansion valve, a four-way valve, an oil separator, 2 two-stage compressors and a vapor-liquid separator, wherein the fan is used for conveying air volume, an exhaust port of each two-stage compressor is connected with a D port of the four-way valve, a return air port of each two-stage compressor is connected with an outlet of the vapor-liquid separator, an inlet of the vapor-liquid separator is connected with an S port of the four-way valve, a C port of the four-way valve is connected with one end of the condenser, the other end of the condenser is connected with one end of the electronic expansion.
Further, when 1 independent circulating system is included, each independent circulating system is correspondingly matched with 3 parallel second-stage compressors; each independent circulation system comprises a fan, a condenser, an electronic expansion valve, a four-way valve, 3 two-stage compressors and a vapor-liquid separator, wherein the fan is used for conveying air volume, the parallel port of the exhaust port of each two-stage compressor is connected with the D port of the four-way valve, the parallel port of the return port of each two-stage compressor is connected with the outlet of the vapor-liquid separator, the inlet of the vapor-liquid separator is connected with the S port of the four-way valve, the C port of the four-way valve is connected with one end of the condenser, the other end of the condenser is connected with one end of the electronic expansion valve.
In order to achieve the above object, the present invention further provides a control method of a water chilling unit of a multi-speed compressor, comprising the steps of:
s1, program setting: defining a plurality of temperature intervals Ts, wherein each temperature interval Ts corresponds to one capacity output gear;
s2, starting to refrigerate, judging which set temperature interval Ts the return water temperature or the outlet water temperature Tw belongs to, and outputting a corresponding capacity output gear;
s3, judging the change of the water return temperature or the water outlet temperature Tw every 15 minutes, and increasing an output gear on the basis of the capacity output gear at the moment when the judged water temperature Tw rises above 1 ℃; when the judged water temperature Tw is reduced by more than 1 ℃, reducing the first gear on the basis of the capacity output gear at the moment; when the judged water temperature Tw rises or falls within 1 degree celsius, the capacity output shift at that time is kept unchanged.
Further, each capacity output gear comprises at least one set of compressor gear operations; on the premise of ensuring the output of the same capacity gear, each independent circulating system is selected to be used more, and when each independent circulating system is ensured to be selected to be used more, the compressor of each independent circulating system is selected to be used less.
Has the advantages that: the utility model discloses a multispeed compressor combination mode has promoted the part load efficiency, in addition the utility model discloses simple structure does not have complicated oil return problem, has advantages such as the reliability is high, with low costs.
Detailed Description
It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Example 1
See fig. 1-6: a water chilling unit of a multi-speed compressor comprises at least one independent circulation system and a heat exchanger, wherein the independent circulation system is correspondingly matched with 1 multi-speed compressor or a plurality of multi-speed compressors connected in parallel.
This embodiment simple structure can effectively promote the partial load efficiency to a certain extent, and does not have complicated oil return problem, reliability height, with low costs.
Specifically, a plurality of connecting terminals for changing the effective resistance of the motor winding of the compressor are arranged on the multi-speed compressor.
The embodiment changes the input power of the motor of the compressor by changing the effective resistance of the winding of the motor of the compressor, thereby effectively changing the rotating speed of the compressor.
Referring to fig. 4, in one specific example: and when the wiring terminals are in two groups, the multi-speed compressor is a two-gear compressor. The compressor motor comprises a stator winding S1, a stator winding S2 and a stator winding S3, wherein the stator winding S1, the stator winding S2 and the stator winding S3 are respectively connected with a connecting terminal U, a connecting terminal V and a connecting terminal W and are connected with the connecting terminals of a three-phase power supply R, a three-phase power supply S and a three-phase power supply T through a first switch; the stator winding S1, the stator winding S2 and the middle section of the stator winding S3 are respectively connected with the connecting terminal U1, the connecting terminal V1 and the connecting terminal W1 and are connected with the connecting terminals of the three-phase power supply R, the three-phase power supply S and the three-phase power supply T through a second switch.
When the first switch is closed, the second switch is opened; the compressor of the embodiment has two-gear speed regulation because the effective resistance of the stator winding of the motor of the compressor is changed through the connecting terminal U1, the connecting terminal V1 and the connecting terminal W1, so that the rotating speed of the motor of the compressor is changed.
Referring to fig. 5, in one specific example: when the wiring terminals are in three groups, the multi-speed compressor is a three-gear compressor. The compressor motor comprises a stator winding S1, a stator winding S2 and a stator winding S3, wherein the stator winding S1, the stator winding S2 and the stator winding S3 are respectively connected with a connecting terminal U, a connecting terminal V and a connecting terminal W and are connected with the connecting terminals of a three-phase power supply R, a three-phase power supply S and a three-phase power supply T through a first switch; the middle sections of the stator winding S1, the stator winding S2 and the stator winding S3 are respectively connected with the connecting terminal U1, the connecting terminal V1 and the connecting terminal W1 and are connected with the connecting terminals of a three-phase power supply R, a three-phase power supply S and a three-phase power supply T through a second switch; the motor stator further comprises a connecting terminal U2, a connecting terminal V2 and a connecting terminal W2, and the other middle section positions of the stator winding S1, the stator winding S2 and the stator winding S3 are respectively connected with the connecting terminal U2, the connecting terminal V2 and the connecting terminal W2 and are connected with the connecting terminals of the three-phase power supply R, the three-phase power supply S and the three-phase power supply T through a third switch.
When the first switch and the second switch are closed, the third switch is opened; the compressor of the embodiment has three-gear speed regulation because the effective resistance of the stator winding of the compressor motor is changed through the wiring terminal U2, the wiring terminal V2 and the wiring terminal W2, so that the rotating speed of the compressor motor is changed.
Referring to fig. 1, in one specific example: when 4 independent circulating systems are contained, each independent circulating system is correspondingly matched with 1 secondary compressor; each independent circulating system comprises a fan, a condenser, an electronic expansion valve, a four-way valve, a two-stage compressor and a vapor-liquid separator, wherein the fan is used for conveying air volume, an exhaust port of the two-stage compressor is connected with a D port of the four-way valve, a return air port of the two-stage compressor is connected with an outlet of the vapor-liquid separator, an inlet of the vapor-liquid separator is connected with an S port of the four-way valve, a C port of the four-way valve is connected with one end of the condenser, the other end of the condenser is connected with one end of the electronic.
Referring to fig. 2, in one specific example: when the compressor comprises 2 independent circulating systems and each independent circulating system is correspondingly matched with 2 parallel secondary compressors; each independent circulating system comprises a fan, a condenser, an electronic expansion valve, a four-way valve, an oil separator, 2 two-stage compressors and a vapor-liquid separator, wherein the fan is used for conveying air volume, an exhaust port of each two-stage compressor is connected with a D port of the four-way valve, a return air port of each two-stage compressor is connected with an outlet of the vapor-liquid separator, an inlet of the vapor-liquid separator is connected with an S port of the four-way valve, a C port of the four-way valve is connected with one end of the condenser, the other end of the condenser is connected with one end of the electronic expansion.
Referring to fig. 3, in one specific example: when 1 independent circulating system is included, each independent circulating system is correspondingly matched with 3 parallel secondary compressors; each independent circulation system comprises a fan, a condenser, an electronic expansion valve, a four-way valve, 3 two-stage compressors and a vapor-liquid separator, wherein the fan is used for conveying air volume, the parallel port of the exhaust port of each two-stage compressor is connected with the D port of the four-way valve, the parallel port of the return port of each two-stage compressor is connected with the outlet of the vapor-liquid separator, the inlet of the vapor-liquid separator is connected with the S port of the four-way valve, the C port of the four-way valve is connected with one end of the condenser, the other end of the condenser is connected with one end of the electronic expansion valve.
It should be noted that the compressor of the above embodiment may be multi-stage, and is not limited to two-stage, and the unit output capacity will be described below by taking the two-stage compressor as an example.
Referring to the multi-speed compressor chiller shown in fig. 1, four secondary compressors (designated as S1 gear and S2 gear) are included, each secondary compressor corresponds to a separate independent circulation system, and the capacity of the set S1 gear is 1/2 of the S2 gear. Thus, the overall unit has an 8-speed output capability, see table 1.
Referring to the multi-speed compressor chiller shown in fig. 2, the multi-speed compressor chiller includes four two-stage compressors (designated as S1 stage and S2 stage), each two parallel two-stage compressors correspond to a separate independent circulation system, and the capacity of the stage S1 is 1/2 of the stage S2. Likewise, the entire unit has an 8-speed output capability, see table 2.
Referring to the multi-speed compressor chiller shown in fig. 3, the multi-speed compressor chiller includes three second-gear compressors (set to S1 gear and S2 gear), three parallel second-gear compressors correspond to a single independent circulation system, and the capacity of the set S1 gear is 1/2 of the S2 gear. Therefore, the whole unit has 6-gear output capacity.
Example 2
Referring to fig. 4: in order to achieve the above object, the present embodiment further provides a method for controlling a chiller of a multi-speed compressor, including the following steps:
s1, program setting: defining a plurality of temperature intervals Ts, wherein each temperature interval Ts corresponds to one capacity output gear;
s2, starting to refrigerate, judging which set temperature interval Ts the return water temperature or the outlet water temperature Tw belongs to, and outputting a corresponding capacity output gear;
s3, judging the change of the water return temperature or the water outlet temperature Tw every 15 minutes, and increasing an output gear on the basis of the capacity output gear at the moment when the judged water temperature Tw rises above 1 ℃; when the judged water temperature Tw is reduced by more than 1 ℃, reducing the first gear on the basis of the capacity output gear at the moment; when the judged water temperature Tw rises or falls within 1 degree celsius, the capacity output shift at that time is kept unchanged.
Preferably, each capacity output gear comprises at least one set of compressor gear operations; on the premise of ensuring the output of the same capacity gear, each independent circulating system is selected to be used more, and when each independent circulating system is ensured to be selected to be used more, the compressor of each independent circulating system is selected to be used less.
For example: referring to the multi-speed compressor chiller shown in fig. 1, when 50% output capacity is required, each compressor of 4 independent circulation systems only needs the S1 gear instead of opening the S2 gear of each compressor of any two independent circulation systems; under the condition of the same output capacity, compressors of the independent circulating systems are operated as much as possible, so that the energy efficiency of the unit can be improved to the maximum extent.
Another example is: referring to the multi-speed compressor water chilling unit shown in fig. 2, when 50% of output capacity is needed, one compressor is started in each of the 2 independent circulation systems, and the corresponding gear is the S2 gear.
The control method of the water chilling unit of the multi-speed compressor in the embodiment is the same as the advantages of the water chilling unit of the multi-speed compressor compared with the prior art, and the detailed description is omitted here.
Table 1:
table 2:
the above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.