CN210951936U - Air-cooled water chiller under wide-temperature working condition - Google Patents
Air-cooled water chiller under wide-temperature working condition Download PDFInfo
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- CN210951936U CN210951936U CN201921651775.XU CN201921651775U CN210951936U CN 210951936 U CN210951936 U CN 210951936U CN 201921651775 U CN201921651775 U CN 201921651775U CN 210951936 U CN210951936 U CN 210951936U
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Abstract
The utility model relates to an air-cooled cold water machine technical field especially relates to a wide temperature operating mode air-cooled cold water machine for the air-cooled cold water machine can keep refrigerating system steady operation under wide temperature operating mode, including the compressor, the condensing system, the expansion valve and the evaporimeter that connect gradually into refrigeration cycle system, the condensing system includes a plurality of condensers that connect in parallel and is used for forcing the condensation fan of condenser convection heat transfer; the temperature sensor is arranged beside the condenser; each condenser is also provided with an electromagnetic valve used for controlling the opening or closing of the corresponding condenser, at least one electromagnetic valve is in a normally open state, and the other electromagnetic valves are respectively electrically connected with the temperature sensor.
Description
Technical Field
The utility model relates to an air-cooled cold water machine technical field, more specifically relates to a wide temperature operating mode air-cooled cold water machine.
Background
The existing air-cooled water chilling unit for the central chilled water system of the passive nuclear power plant requires refrigeration operation all the year round and can meet the refrigeration requirement under the wide-temperature working condition of +46 ℃ to-40 ℃. The well known air-cooled water chilling unit discharges indoor heat to the environment through condenser and ambient air heat exchange, and when ambient temperature rises or reduces, condensing pressure also can rise or reduce, in order to guarantee that the condensing pressure of system is in reasonable scope, needs the corresponding increase or reduction of condensation heat transfer area also, just can guarantee air-cooled water chilling unit normal operating.
In the prior art, an adaptable air-cooled water chilling unit with an ambient temperature range of +46 ℃ to-40 ℃ comprises a condensing fan, a condenser linked with a compressor, and a plurality of independently adjustable condensers, wherein when the unit is operated, the independently adjustable condensers are turned on or off according to a condensing pressure value of a system, for example, a first independently adjustable condenser is turned on when the condensing pressure of the system rises to a certain set value, a second independently adjustable condenser is turned on when the condensing pressure of the system continues to rise and rises to a certain set value, and so on until all condensers are turned on; and when the condensing pressure of the system is reduced to a certain set value, the first independently adjustable condenser is closed, and the like is repeated until all the plurality of independently adjustable condensers are closed. The number of the condensers is changed according to the change of the condensation pressure so as to achieve the purpose of adjusting the condensation area, and meanwhile, the air quantity is adjusted by depending on the condensation fan in the process.
The prior art changes the condensing area by monitoring the condensing pressure of the system to maintain the normal operation of the refrigeration system. However, various parameters of the refrigeration system in the stable operation process, such as high pressure, low pressure, condensing pressure, etc., are stable, and if one of the parameters changes suddenly, other parameters may change, thereby affecting the stability of the refrigeration system.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming above-mentioned prior art's defect, provide an air-cooled cold water machine of wide temperature operating mode for air-cooled cold water machine can keep refrigerating system even running under wide temperature operating mode.
The utility model adopts the technical proposal that:
a wide-temperature working condition air-cooled water chiller comprises a compressor, a condensing system, an expansion valve and an evaporator which are sequentially connected into a refrigeration circulating system, wherein the condensing system comprises a plurality of condensers connected in parallel and a condensing fan for forcing the condensers to conduct heat convection; the temperature sensor is arranged beside the condenser; each condenser is also provided with an electromagnetic valve used for controlling the opening or closing of the corresponding condenser, at least one electromagnetic valve is in a normally open state, and the other electromagnetic valves are respectively electrically connected with the temperature sensor.
A wide temperature operating mode forced air cooling cold water machine, its refrigeration cycle system's theory of operation does: the compressor is started, the unit starts to work, at the moment, gaseous refrigerants coming out of the compressor form liquid refrigerants after heat exchange through the operation of a plurality of condensers connected in parallel in a condensation system and a condensation fan used for forced condenser convection heat exchange, the liquid refrigerants are throttled into gas-liquid mixed refrigerants through an expansion valve and then enter an evaporator for heat exchange, the gas-liquid mixed refrigerants are heated to form gaseous refrigerants and return to the compressor, and therefore a refrigeration cycle is completed. The condensing system further comprises a temperature sensor, and the temperature sensor is used for acquiring the current ambient temperature data of the unit and further controlling the opening of the condensers with fixed quantity. Each condenser is further provided with an electromagnetic valve, the electromagnetic valves are used for controlling the opening or closing of the condensers, when the unit starts to work, at least one electromagnetic valve is in a normally open state, namely one condenser of the unit is in a normally open state, and one condenser participates in condensation heat exchange in the whole process of the unit working process.
Further, still include condensation pressure sensor, condensation pressure sensor sets up in the condensing system export, condensation pressure sensor with the condensation fan electricity is connected.
The condensation pressure sensor is used for acquiring the condensation pressure of the system and further controlling the running frequency of the condensation fan in a mode of being electrically connected with the condensation fan.
Further, the condensation fan includes the flabellum, is used for driving flabellum pivoted motor and condensation fan converter, condensation fan converter with the motor electricity is connected.
The condensing pressure sensor is electrically connected with a frequency converter of the condensing fan, and the frequency converter of the condensing fan controls the operating frequency of the condensing fan by changing the rotating speed of a motor of the condensing fan.
Furthermore, the number of the condensing fans is multiple, and each condenser corresponds to one condensing fan.
Each condenser corresponds to a condensing fan used for forced condenser convection heat transfer, the condensers with fixed quantity are set to participate in heat transfer under different temperature zone working conditions, heat transfer is assisted through the condensing fans, and the condensing efficiency of the system is rapidly improved.
Further, the outlet of each condenser is also provided with a one-way valve.
And the outlet of each condenser is provided with a one-way valve for preventing the refrigerant of the system from flowing back into the condenser in a closed state, so that the refrigerant of the system cannot enter the condenser which does not participate in heat exchange, and the loss of condensing pressure is avoided.
Furthermore, the frequency range of the condensing fan is 10 HZ-50 HZ.
The frequency converter of the condensing fan controls the operating frequency range of the condensing fan to be 10 HZ-50 HZ, and the plurality of condensing fans are started and stopped simultaneously.
Further, the condenser also comprises a liquid storage device, wherein an inlet of the liquid storage device is connected with an outlet of the condensing system, and an outlet of the liquid storage device is connected with an inlet of the expansion valve.
The liquid storage device is used as a transfer station of the system refrigerant and is used for storing the liquid refrigerant formed after the gaseous refrigerant is subjected to heat exchange through the condensing system.
Further, the drying device also comprises a drying filter, wherein the inlet of the drying filter is connected with the outlet of the liquid storage device, and the outlet of the drying filter is connected with the inlet of the expansion valve.
The drying filter improves the utilization rate of the refrigerant by filtering impurities in the refrigerant and drying moisture in the refrigerant, thereby improving the refrigeration cycle efficiency.
Further, the compressor also comprises a pressure maintaining valve which is arranged at the outlet of the compressor.
When the compressor starts, the pressure maintaining valve is opened or closed according to the high-low pressure difference of the unit so as to maintain the oil supply pressure difference of the unit.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model provides a wide temperature operating mode air-cooled cold water machine, through the condenser of the fixed quantity of operation under temperature sensor detection ambient temperature and the different warm area operating modes of control, simultaneously through condensation pressure sensor detecting system condensation pressure and then control condensation fan frequency conversion auxiliary regulation, at the in-process of unit operation, the condensation area does not take place the sudden change, condensation pressure can not take place the abrupt change yet, consequently the condition of condensation pressure parameter rapid change can not appear, make air-cooled cold water machine can keep refrigerating system even running under wide temperature operating mode.
Drawings
Fig. 1 is a system structure diagram of the present invention.
Detailed Description
The drawings of the present invention are for illustration purposes only and are not to be construed as limiting the invention. For a better understanding of the following embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
As shown in fig. 1, the utility model provides a wide temperature working condition air-cooled chiller, which comprises a compressor 1, a condensing system, an expansion valve 10 and an evaporator 11 which are connected in sequence to form a refrigeration cycle system, wherein the condensing system comprises a plurality of condensers 5 which are connected in parallel and a condensing fan 4 for forcing the condensers to perform heat convection; the condenser temperature control device comprises a temperature sensor, wherein the temperature sensor is arranged beside the condenser. Specifically, the temperature sensor is not shown in fig. 1. Each condenser 5 is further provided with an electromagnetic valve 3, at least one electromagnetic valve 3 is in a normally open state, and the other electromagnetic valves 3 are respectively electrically connected with the temperature sensor.
Preferably, the condenser further comprises a condensation pressure sensor 7, the condensation pressure sensor 7 is arranged at an outlet of the condensation system, and the condensation pressure sensor 7 is electrically connected with the condensation fan 4.
Preferably, in this embodiment, the condensing fan 4 includes a fan blade, a motor for driving the fan blade to rotate, and a condensing fan frequency converter, and the condensing fan frequency converter is electrically connected to the motor. In particular, the condenser fan frequency converter is not shown in fig. 1.
Preferably, the number of the condensing fans is multiple, and each condenser corresponds to one condensing fan.
Preferably, the outlet of each condenser is also provided with a one-way valve 6.
Preferably, the present embodiment further comprises a reservoir 8, wherein an inlet of the reservoir 8 is connected to an outlet of the condensing system, and an outlet of the reservoir 8 is connected to an inlet of the expansion valve 10.
Preferably, the present embodiment further comprises a dry filter 9, wherein an inlet of the dry filter 9 is connected with an outlet of the reservoir 8, and an outlet of the dry filter 9 is connected with an inlet of the expansion valve 10.
Preferably, the present embodiment further comprises a pressure maintaining valve 2, and the pressure maintaining valve 2 is arranged at the outlet of the compressor 1.
The working process of the refrigeration cycle system is as follows: the compressor 1 is started, the pressure maintaining valve 2 is opened or closed according to the high-low pressure difference of the unit to maintain the oil supply pressure difference of the compressor 1, when the unit starts to work, liquid refrigerant formed by heat exchange of gaseous refrigerant from an exhaust port of the compressor 1 through a condensing system is temporarily stored in the liquid reservoir 8, the refrigerant from the liquid reservoir 8 is throttled into gas-liquid mixed refrigerant through the expansion valve 10 after impurities and moisture are removed through the drying filter 9, then the refrigerant enters the evaporator 11 for evaporation and heat exchange, and finally the gas-liquid mixed refrigerant is heated into the gaseous refrigerant and then returns to the compressor 1, so that a refrigeration cycle system is completed.
In condensing system heat transfer in-process, an solenoid valve 3 is in normally open state, the condenser that corresponds keeps normally open state, temperature sensor gathers ambient temperature and controls the solenoid valve 3 of fixed quantity and opens, the condenser operation of corresponding fixed quantity promptly, condensation pressure sensor 2 detecting system condensation pressure control condensation fan converter, condensation fan converter passes through the operating frequency that all condensation fans were adjusted to condensation fan motor, and then realize assisting condensation air regulation to condensation area.
In this embodiment, the number of condensers is 4, and in the heat exchange process of the condensing system, the specific opening number of condensers is as shown in table 1:
TABLE 1 number of condensers started under different temperature zone conditions
| Temperature zone | High temperature regime | Medium temperature operating mode | Low temperature operating mode |
| Number of solenoid valves opened | All are | All are | 3/4 sum of the total and rounding up |
| Number of condensers turned on | All are | All are | 3/4 sum of the total and rounding up |
| Number of 4 condensers started | 4 | 4 | 3 |
From table 1, three temperature zone conditions of the unit are preset: high temperature working condition, medium temperature working condition and low temperature working condition, adopting a temperature sensor to detect environmental temperature data,
when the ambient temperature falls into the high-temperature working condition of the unit, all the electromagnetic valves in the unit are opened at the moment, namely 4 condensers are opened;
when the ambient temperature falls into the medium-temperature working condition of the unit, all the electromagnetic valves in the unit are opened at the moment, namely 4 condensers are opened;
when the ambient temperature falls into the low-temperature working condition of the unit, 3/4 of the total number of the electromagnetic valves in the unit and the integral electromagnetic valves are opened, namely 3 condensers are opened.
In this embodiment, the condensing fan frequency converter is controlled by detecting the condensing pressure of the system through the condensing pressure sensor under different temperature zone working conditions, the operating frequency of the condensing fan is adjusted by controlling the rotating speed of the condensing fan motor by the condensing fan frequency converter, specifically, the operating frequency range of the condensing fan is 10HZ to 50HZ, and all the condensing fans are simultaneously started and stopped.
It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the technical solutions of the present invention, and are not limitations to the specific embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims (9)
1. A wide-temperature working condition air-cooled water chiller comprises a compressor, a condensing system, an expansion valve and an evaporator which are sequentially connected into a refrigeration circulating system, and is characterized in that the condensing system comprises a plurality of condensers which are connected in parallel and a condensing fan for forcing the condensers to conduct heat convection; the temperature sensor is arranged beside the condenser; each condenser is also provided with an electromagnetic valve used for controlling the opening or closing of the corresponding condenser, at least one electromagnetic valve is in a normally open state, and the other electromagnetic valves are respectively electrically connected with the temperature sensor.
2. The wide-temperature working condition air-cooled water chiller according to claim 1, further comprising a condensation pressure sensor, wherein the condensation pressure sensor is arranged at an outlet of the condensation system, and the condensation pressure sensor is electrically connected with the condensation fan.
3. The wide-temperature working condition air-cooled water chiller according to claim 2, wherein the condensing fan comprises fan blades, a motor for driving the fan blades to rotate, and a condensing fan frequency converter, and the condensing fan frequency converter is electrically connected with the motor.
4. The wide-temperature working condition air-cooled water chiller according to claim 1, wherein the number of the condensing fans is multiple, and each condenser corresponds to one condensing fan.
5. The wide-temperature working condition air-cooled water chiller according to claim 1, wherein a one-way valve is further provided at an outlet of each condenser.
6. The wide-temperature working condition air-cooled water chiller according to claim 1, wherein the frequency range of the condensing fan is 10HZ to 50 HZ.
7. The wide-temperature working condition air-cooled water chiller according to claim 1 further comprising a reservoir, wherein an inlet of the reservoir is connected with an outlet of the condensing system, and an outlet of the reservoir is connected with an inlet of the expansion valve.
8. The wide-temperature working condition air-cooled water chiller according to claim 7 further comprising a dry filter, wherein an inlet of the dry filter is connected with an outlet of the reservoir, and an outlet of the dry filter is connected with an inlet of the expansion valve.
9. The wide-temperature-working-condition air-cooled water chiller according to claim 1, further comprising a pressure maintenance valve disposed at the outlet of the compressor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921651775.XU CN210951936U (en) | 2019-09-29 | 2019-09-29 | Air-cooled water chiller under wide-temperature working condition |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921651775.XU CN210951936U (en) | 2019-09-29 | 2019-09-29 | Air-cooled water chiller under wide-temperature working condition |
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| CN210951936U true CN210951936U (en) | 2020-07-07 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112240616A (en) * | 2020-09-21 | 2021-01-19 | 依米康科技集团股份有限公司 | Energy-saving evaporative condensing cold water air conditioning unit system and control method |
| CN116202244A (en) * | 2022-12-22 | 2023-06-02 | 珠海格力电器股份有限公司 | Heat exchange device, air conditioner, control method and device of air conditioner and air conditioning system |
-
2019
- 2019-09-29 CN CN201921651775.XU patent/CN210951936U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112240616A (en) * | 2020-09-21 | 2021-01-19 | 依米康科技集团股份有限公司 | Energy-saving evaporative condensing cold water air conditioning unit system and control method |
| CN116202244A (en) * | 2022-12-22 | 2023-06-02 | 珠海格力电器股份有限公司 | Heat exchange device, air conditioner, control method and device of air conditioner and air conditioning system |
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