CN213238005U - Air-supplementing and enthalpy-increasing refrigerant system and water chilling unit - Google Patents
Air-supplementing and enthalpy-increasing refrigerant system and water chilling unit Download PDFInfo
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- CN213238005U CN213238005U CN202022104646.8U CN202022104646U CN213238005U CN 213238005 U CN213238005 U CN 213238005U CN 202022104646 U CN202022104646 U CN 202022104646U CN 213238005 U CN213238005 U CN 213238005U
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Abstract
The utility model discloses an enthalpy refrigerant system and cooling water set are increased in tonifying qi, including compressor (1), condenser (2), vapour and liquid separator (4), evaporimeter (6) that connect into closed circuit in order, its characterized in that: an expansion machine (3) is arranged between the condenser (2) and the gas-liquid separator (4), the booster pump (5) is coaxially connected with the expansion machine (3), the gas-liquid separator (4) is connected with the booster pump (5), and the booster pump (5) is communicated with the condenser (2). The expansion machine is adopted to replace the throttling mechanism of the existing water chilling unit, so that the irreversible loss of direct throttling of the refrigerant is reduced; the gaseous refrigerant expanded and flashed by the expansion machine is pressurized to the condensing pressure by utilizing the work output by the expansion machine and enters the top of the condenser, so that the refrigerant entering the evaporator is all liquid refrigerant, all the refrigerant entering the evaporator can generate cold through gasification, and the refrigerating capacity of the refrigerant of unit mass of the system is large.
Description
Technical Field
The utility model belongs to the technical field of refrigeration heating, fresh-keeping freezing, hotel's hot water supply, concretely relates to tonifying qi increases enthalpy refrigerant system and adopts its cooling water set.
Background
The existing water chilling unit throttling mechanisms on the market mostly adopt the throttling mechanisms such as an expansion valve, an orifice plate and the like, and as shown in figure 1, the water chilling unit throttling mechanisms mainly comprise: a second compressor (supercharger) 6 is connected in parallel outside the first compressor 1 to increase the system circulation amount so as to increase the refrigerating capacity, and two parallel compressors are formed; a first expansion valve 3 is arranged between the condenser 2 and the gas-liquid separator 4; a third expansion valve 7 is arranged between the gas-liquid separator 4 and the evaporator 8, the refrigerant throttled by the third expansion valve 7 and entering the evaporator 8 still has throttled and flashed gas, and the heat exchange quantity of the refrigerant with unit mass in the evaporator 8 is small; a second expansion valve 5 between the gas-liquid separator 4 and the supercharger 6 is used for throttling the gas with intermediate pressure to evaporation pressure to prevent the gas in the gas-liquid separator from being mixed into the evaporator; the added compressor (booster) 6 still requires additional power to drive.
The throttling mechanism adopts an expansion valve, a pore plate and the like, adopts a mode of connecting two compressors in parallel for improving the flow of a system refrigerant, and has the following defects:
the throttling process is an irreversible process, the entropy of the refrigerant is increased, liquid flash after throttling is serious, and the refrigerating capacity of the refrigerant of unit mass of the system is small;
for a system with an expansion machine as a throttling mechanism, after the refrigerant is subjected to isentropic expansion work by the expansion machine, part of liquid refrigerant is flashed into gas, and if gas-liquid separation is not carried out, the gaseous refrigerant entering an evaporator still cannot generate cold energy, so that the refrigerating capacity of the refrigerant per unit mass of the system is small.
The supercharger requires additional power consumption, and although the system cooling capacity (heating capacity-heat pump unit) increases, the system power consumption also increases.
For a system (such as Chinese patent ZL201020657628.6) using an expansion machine as a throttling device, work output by the expansion machine is used for conveying liquid refrigerant from the bottom of a condenser to power of exhaust before the condenser, and the purpose is to reduce the proportion of sensible heat exchange in the condenser by reducing the superheat degree of high-pressure gas entering the condenser so as to improve the heat exchange efficiency of the condenser. On one hand, after the isentropic expansion of the expansion machine, the liquid refrigerant still has partial flash, the flash gas entering the evaporator can not generate cold energy through gasification, and the refrigerating capacity of the refrigerant of unit mass of the system is small; on the other hand, the sensible heat in the condenser is smaller for the exhaust superheat of the centrifugal chiller compressor at about 7 ℃; for partial load, the exhaust superheat degree of the compressor can be increased, but the heat exchange area of the condenser under the partial load is enough, and the approach temperature (the difference between the condensation temperature and the water outlet temperature of the condenser) of the condenser is small, so that the superheat degree of high-pressure gas entering the condenser is reduced to reduce the occupation ratio of sensible heat exchange in the condenser by driving a liquid refrigerant at the bottom of the condenser by the work output by the expansion machine, thereby improving the heat exchange efficiency of the condenser and having no obvious effect on the application of a centrifugal water chilling unit adopting a shell-and-tube heat exchanger.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides an enthalpy refrigerant system and cooling water set are increased to tonifying qi can reduce the direct throttle irreversible loss of refrigerant to can guarantee that the refrigerant that gets into the evaporimeter is whole to be liquid refrigerant, the refrigerating output increase of system unit mass refrigerant.
The utility model discloses a solve above-mentioned technical problem, adopt following technical scheme:
the utility model provides an tonifying qi increases enthalpy refrigerant system, includes compressor (1), condenser (2), vapour and liquid separator (4), evaporimeter (6) that connect into closed circuit in order, its characterized in that: an expansion machine (3) is arranged between the condenser (2) and the gas-liquid separator (4), the booster pump (5) is coaxially connected with the expansion machine (3), the gas-liquid separator (4) is connected with the booster pump (5), and the booster pump (5) is communicated with the condenser (2).
Further, the gas-liquid separator (4) and the booster pump (5) are connected by a first parallel circuit, which is parallel and in reverse flow to the circuit between the gas-liquid separator (4) and the expander (3).
Further, the booster pump (5) and the condenser (2) are connected by a second parallel circuit, which is parallel and in reverse flow direction to the circuit between the condenser (2) and the expander (3).
Furthermore, the booster pump (5) and the expander (3) both comprise impellers, and the impellers of the booster pump and the expander are connected into a whole through a shaft (7).
Further, the impeller of the expander (3) is used as a driving wheel, and the impeller of the booster pump (5) is used as a driven wheel which runs synchronously with the driving wheel.
Further, the gas interface of the compressor (1) is communicated with the condenser (2).
Further, a liquid interface of the condenser (2) is communicated with the expander (3).
Furthermore, the booster pump (5) is communicated with a gas interface at the top of the gas-liquid separator (4).
Further, a gas interface of the booster pump (5) is communicated with the condenser (2).
A water chilling unit is characterized by comprising the air-supplying enthalpy-increasing refrigerant system.
From this, for prior art, the utility model discloses following beneficial effect has:
the utility model adopts the expander to replace the throttling mechanism of the existing water chilling unit, thus reducing the irreversible loss of direct throttling of the refrigerant; the gaseous refrigerant expanded and flashed by the expansion machine is pressurized to the condensing pressure by utilizing the work output by the expansion machine and enters the top of the condenser, so that the refrigerant entering the evaporator is all liquid refrigerant, all the refrigerants entering the evaporator can generate cold energy through gasification, and the refrigerating capacity of the refrigerant of unit mass of the system is increased.
Drawings
Fig. 1 is a system structure diagram of a throttling mechanism of a water chilling unit in the prior art.
The reference numerals in fig. 1 correspond to the following: 1-a first compressor, 2-a condenser, 3-a first expansion valve, 4-a gas-liquid separator, 5-a second expansion valve, 6-a second compressor (a supercharger), 7-a third expansion valve and 8-an evaporator.
Fig. 2 is the structure diagram of the air-supplying enthalpy-increasing refrigerant system suitable for the water chilling unit.
Fig. 3 is a schematic diagram of the structure of the air-supplying enthalpy-increasing refrigerant system expander 3 and the booster pump 5 according to the present invention.
The reference numerals in figures 2-3 correspond to the following: 1-compressor, 2-condenser, 3-expander, 4-gas-liquid separator, 5-booster pump, 6-evaporator and 7-shaft.
Detailed Description
Fig. 2 is a structural diagram of an air-supplying enthalpy-increasing refrigerant system suitable for a water chilling unit, wherein an expansion machine is adopted to replace a throttling mechanism in the existing product structure; the gaseous refrigerant expanded and flashed by the expander is pressurized to the condensing pressure by utilizing the work output by the expander and enters the top of the condenser, so that the refrigerant entering the evaporator is all liquid refrigerant, the refrigerant entering the evaporator can generate cold energy through gasification, and the refrigerating capacity of the refrigerant of unit mass of the system is large. The specific structure is shown in fig. 2:
the utility model provides an tonifying qi increases enthalpy refrigerant system, includes that the compressor 1, condenser 2, vapour and liquid separator 4, the evaporimeter 6 that connect into closed circuit in order, its characterized in that sets up expander 3 between condenser 2 and vapour and liquid separator 4, and booster pump 5 and expander 3 are coaxial continuous, and vapour and liquid separator 4 and booster pump 5 link to each other, and booster pump 5 communicates with condenser 2.
The expander 3 and the booster pump 5 each include an impeller, and the impellers of both are connected as a whole by a shaft 7.
The high-temperature high-pressure gaseous refrigerant from the compressor (supercharger) 1 is cooled into supercooled liquid by the condenser 2 and then enters the expander 3, the liquid refrigerant expands in the expander 3 to do work externally, the pressure is reduced to evaporation pressure and then enters the gas-liquid separator 4, the liquid refrigerant in the gas-liquid separator 4 enters the evaporator 6 to absorb heat and gasify into low-temperature low-pressure gas, and the low-temperature low-pressure gas is changed into superheated gas under condensation pressure after being worked by the compressor (supercharger) 1; the work of expansion and external work in the expander 3 is used as a power source of the booster pump 5, the gaseous refrigerant at the top of the gas-liquid separator 4 is pressurized to the condensing pressure and mixed with the gaseous refrigerant at the outlet of the compressor 1, and then the mixture enters the condenser 2, so that the whole cycle is completed.
Fig. 3 is a schematic diagram showing a structure of the expander 3 and the booster pump 5, and as shown in the figure, the high-pressure supercooled liquid from the condenser 2 enters the expander 3, and in the expander 3, the high-pressure liquid pushes the impeller to rotate to work the impeller, and the pressure and temperature of the liquid are reduced. The expander 3 and the impeller of the booster pump 5 are connected into a whole through the shaft 7, the rotation of the impeller of the expander 3 drives the impeller of the booster pump 5 to rotate, so that a negative pressure area is formed at the inlet of the booster pump 5, when the gaseous refrigerant at the top of the gas-liquid separator 4 is sucked into the impeller of the booster pump 5, the kinetic energy of the impeller acting on the gaseous refrigerant is increased, and finally, the kinetic energy of the kinetic energy entering a diffusion channel is converted into pressure energy which is discharged from the outlet of the booster pump 5, so that the boosting process of the liquid refrigerant is completed.
Claims (10)
1. The utility model provides an tonifying qi increases enthalpy refrigerant system, includes compressor (1), condenser (2), vapour and liquid separator (4), evaporimeter (6) that connect into closed circuit in order, its characterized in that: an expansion machine (3) is arranged between the condenser (2) and the gas-liquid separator (4), the booster pump (5) is coaxially connected with the expansion machine (3), the gas-liquid separator (4) is connected with the booster pump (5), and the booster pump (5) is communicated with the condenser (2).
2. The vapor-supplementing enthalpy-increasing refrigerant system according to claim 1, characterized in that: the gas-liquid separator (4) and the booster pump (5) are connected by a first parallel circuit, which is parallel and in reverse flow direction to the circuit between the gas-liquid separator (4) and the expander (3).
3. The vapor-supplementing enthalpy-increasing refrigerant system according to claim 1, characterized in that: the booster pump (5) and the condenser (2) are connected by a second parallel circuit, which is parallel and in reverse flow direction to the circuit between the condenser (2) and the expander (3).
4. The vapor-supplementing enthalpy-increasing refrigerant system according to claim 1, characterized in that: the booster pump (5) and the expander (3) both comprise impellers, and the impellers of the booster pump and the expander are connected into a whole through a shaft (7).
5. The vapor-supplementing enthalpy-increasing refrigerant system according to claim 1, characterized in that: the impeller of the expansion machine (3) is used as a driving wheel, and the impeller of the booster pump (5) is used as a driven wheel which runs synchronously with the driving wheel.
6. The vapor-supplementing enthalpy-increasing refrigerant system according to claim 1, characterized in that: the gas interface of the compressor (1) is communicated with the condenser (2).
7. The vapor-supplementing enthalpy-increasing refrigerant system according to claim 1, characterized in that: the liquid interface of the condenser (2) is communicated with the expander (3).
8. The vapor-supplementing enthalpy-increasing refrigerant system according to claim 1, characterized in that: the booster pump (5) is communicated with a gas interface in the top of the gas-liquid separator (4).
9. The vapor-supplementing enthalpy-increasing refrigerant system according to claim 1, characterized in that: the gas interface of the booster pump (5) is communicated with the condenser (2).
10. A chiller plant comprising the vapor-supplementing enthalpy-increasing refrigerant system according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022104646.8U CN213238005U (en) | 2020-09-23 | 2020-09-23 | Air-supplementing and enthalpy-increasing refrigerant system and water chilling unit |
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| CN202022104646.8U CN213238005U (en) | 2020-09-23 | 2020-09-23 | Air-supplementing and enthalpy-increasing refrigerant system and water chilling unit |
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| CN213238005U true CN213238005U (en) | 2021-05-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115253585A (en) * | 2022-07-29 | 2022-11-01 | 中国科学院工程热物理研究所 | For CO2Method and system for utilizing collected residual pressure power generation cold energy |
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- 2020-09-23 CN CN202022104646.8U patent/CN213238005U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115253585A (en) * | 2022-07-29 | 2022-11-01 | 中国科学院工程热物理研究所 | For CO2Method and system for utilizing collected residual pressure power generation cold energy |
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