CN213020389U - Water chilling unit of multi-speed compressor - Google Patents
Water chilling unit of multi-speed compressor Download PDFInfo
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- CN213020389U CN213020389U CN202022023774.XU CN202022023774U CN213020389U CN 213020389 U CN213020389 U CN 213020389U CN 202022023774 U CN202022023774 U CN 202022023774U CN 213020389 U CN213020389 U CN 213020389U
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Abstract
The utility model provides a water chilling unit of many fast compressors, including at least one independent circulation system and heat exchanger, the independent circulation system corresponds to match 1 many fast compressors or a plurality of parallelly connected many fast compressors, when containing 4 independent circulation systems, each independent circulation system corresponds to match 1 two keep off the compressor; each independent circulating system comprises a fan, a condenser, an electronic expansion valve, a four-way valve, a two-stage compressor and a gas-liquid separator. 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.
Description
Technical Field
The utility model relates to a cooling water set technical field, in particular to cooling water set of many fast compressors.
Background
The existing conventional air-cooled water chilling unit mostly adopts 2 to 4 independent systems, the finned heat exchanger and the shell and tube also correspondingly adopt 2 to 4 independent systems, and each system adopts 1 constant-speed compressor. The conventional water chilling unit is difficult to achieve high energy efficiency under partial load.
The new energy efficiency standard of the water chilling unit takes the IPLV as one of the examination bases, and the energy efficiency of part of the load is very important in the calculation of the energy efficiency of the IPLV. In order to meet the new energy efficiency standard of the water chiller, a lot of manufacturers develop new water chiller units or variable frequency water chiller units adopting parallel compressor systems.
The novel water chilling unit adopting the parallel compressor system has the advantages that the refrigeration system is more complex due to the fact that the low-pressure cavity parallel compressor is adopted, the oil level control of the system is quite complex, the oil level control method is not perfect aiming at the modular water machine of the parallel compressor system at present, the operation reliability of the system is low, and the condition that the compressor is burnt due to oil shortage in operation is easy to occur. The unit adopting the frequency conversion scheme is limited by the bottleneck technology of high-power frequency conversion driving, and has low reliability and high cost.
Based on this, there is an urgent need for a technically simple, high-IPLV, multi-speed compressor chiller.
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.
Drawings
The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:
fig. 1 is a schematic structural diagram of a water chilling unit of a multi-speed compressor according to an embodiment of the present invention (including 4 independent circulation systems, each of which is correspondingly matched with 1 secondary compressor);
fig. 2 is a schematic structural diagram of a water chilling unit of a multi-speed compressor according to an embodiment of the present invention (including 2 independent circulation systems, each of which is correspondingly matched with 2 parallel two-stage compressors);
fig. 3 is a schematic structural diagram of a water chilling unit of a multi-speed compressor according to an embodiment of the present invention (including 1 independent circulation system, each independent circulation system correspondingly matches 3 parallel two-stage compressors);
fig. 4 is a flow chart illustrating a method for controlling a chiller of a multi-speed compressor according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a compressor motor winding of a two-stage compressor according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a compressor motor winding of a three-gear compressor according to an embodiment of the present invention.
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.
Claims (6)
1. The water chilling unit with the multi-speed compressors is characterized by comprising at least one independent circulating system and a heat exchanger, wherein the independent circulating system is correspondingly matched with 1 multi-speed compressor or a plurality of multi-speed compressors connected in parallel, and when the water chilling unit comprises 4 independent circulating systems, each independent circulating system is correspondingly matched with 1 two-stage 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.
2. A multi-speed compressor chiller as set forth in claim 1 wherein said multi-speed compressor is provided with terminals for varying the effective resistance of the compressor motor windings.
3. A multi-speed compressor chiller as set forth in claim 2 wherein said multi-speed compressor is a two-stage compressor when said terminals are in two sets.
4. A multi-speed compressor chiller as set forth in claim 2 wherein said multi-speed compressor is a three speed compressor when three sets of terminals are present.
5. A multi-speed compressor chiller as set forth in claim 1 wherein when there are 2 independent circulation systems each matching 2 parallel two stage 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.
6. A multi-speed compressor chiller as set forth in claim 1 wherein when there are 1 independent circulation systems each matching 3 parallel two 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.
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| CN202022023774.XU CN213020389U (en) | 2020-09-14 | 2020-09-14 | Water chilling unit of multi-speed compressor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111947342A (en) * | 2020-09-14 | 2020-11-17 | 滁州普利斯特软件有限公司 | Water chilling unit of multi-speed compressor and control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111947342A (en) * | 2020-09-14 | 2020-11-17 | 滁州普利斯特软件有限公司 | Water chilling unit of multi-speed compressor and control method |
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Effective date of registration: 20210917 Address after: 239000, No. 509, Hangzhou North Road, Chuzhou City, Anhui Province Patentee after: CHUZHOU XINGLIAN ELECTRONICS Co.,Ltd. Address before: 239000 Shanghai North Road, Chuzhou, Chuzhou, Anhui Patentee before: Chuzhou pulister Software Co.,Ltd. |
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| TR01 | Transfer of patent right | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 239000, No. 509, Hangzhou North Road, Chuzhou City, Anhui Province Patentee after: Anhui Xinglian Intelligent Control Technology Co.,Ltd. Address before: 239000, No. 509, Hangzhou North Road, Chuzhou City, Anhui Province Patentee before: CHUZHOU XINGLIAN ELECTRONICS Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder |