CN210980415U - Precise-adjustment refrigeration cycle system with economizer - Google Patents
Precise-adjustment refrigeration cycle system with economizer Download PDFInfo
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- CN210980415U CN210980415U CN201921602873.4U CN201921602873U CN210980415U CN 210980415 U CN210980415 U CN 210980415U CN 201921602873 U CN201921602873 U CN 201921602873U CN 210980415 U CN210980415 U CN 210980415U
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Abstract
The utility model discloses a precisely adjusted refrigeration cycle system with an economizer, which comprises a condenser, the economizer, a compressor, a main liquid path expansion valve, a manual expansion valve, a pressure regulating valve and an evaporator; the evaporator is arranged between the expansion valve and the compressor, the outlet of the condenser is communicated with the inlet of one side of the economizer, the outlet of one side of the economizer is communicated with the main liquid path expansion valve, and the outlet of the other side of the economizer is communicated with the middle suction port of the compressor; the inlet on the other side of the economizer is connected with a manual expansion valve which is communicated with a pressure regulating valve, and the pressure regulating valve is communicated between the condenser and the economizer or between the economizer and the main liquid path expansion valve, so that the problem of keeping good flow regulation precision under the condition of not occupying point positions is solved.
Description
Technical Field
The utility model relates to a refrigeration cycle system, in particular to take refrigeration cycle system of accurate regulation of economic ware.
Background
Screw and centrifugal chiller units typically employ an economizer (subcooler) cycle in the refrigeration system. After the economizer is used, the supercooling degree in front of the expansion valve is effectively improved, so that the purposes of improving the refrigerating capacity and the performance coefficient are achieved. The types of economizers vary, and plate change economizers and flash economizers are common.
The plate change economizer is typically positioned before the condenser outlet and the main circuit electronic expansion valve. The refrigerant is subjected to supercooling condensation before entering the economizer and has an initial supercooling degree, and after entering the economizer, the refrigerant of the main loop exchanges heat with the refrigerant of the bypass loop. In order to ensure the heat exchange effect, the bypass loop refrigerant needs to be throttled once, and the throttled refrigerant is evaporated in the plate exchanger to become a medium-pressure gaseous refrigerant with a certain superheat degree and then enters a middle air suction port of the compressor. The refrigerant of the main loop realizes secondary supercooling through heat exchange, the enthalpy value of the refrigerant is effectively reduced, and the enthalpy difference of unit mass flow is greatly improved, so that the refrigerating capacity of the unit is improved by 10-15%. The middle suction of the compressor causes the compressor to work and lift slightly. Generally, after the economizer is adopted for circulation, the refrigerating efficiency can be improved by 5-10%, and the improvement range tends to increase along with the increase of the difference value of the evaporation pressure and the condensation pressure.
In the circulation link of the plate-changing type economizer, start-stop control and bypass loop flow regulation of the plate-changing type economizer are particularly important: the starting and stopping control and bypass loop flow regulation modes of the common economizer include the following modes:
①, the scheme of the electromagnetic valve and the thermostatic expansion valve is that the switch of the bypass loop is directly controlled by the electromagnetic valve, the switch signal of the electromagnetic valve comes from high pressure, the thermostatic expansion valve is used for controlling the flow, and in order to ensure the precision, the external balance type is mostly adopted, the scheme has the defects that the system and the circuit are complex, the cost is high, and the electromagnetic valve needs to occupy one point position;
②, the electronic expansion valve scheme is that the bypass circuit is switched on and off and the flow is controlled by the electronic expansion valve, the pipeline is relatively simple and the control is accurate, but the scheme has the biggest problem of high cost and needs to occupy one point.
③, the proposal of the electromagnetic valve and the capillary tube is that the flow regulation precision of the bypass loop of the economizer is not enough.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: the utility model aims at providing a take refrigeration cycle system of accurate regulation of economic ware has solved and has kept good flow control precision under the condition that does not occupy the position.
The technical scheme is as follows: the utility model relates to a refrigeration cycle system with an economizer and accurate adjustment, which mainly comprises a condenser, an economizer, a compressor, a main liquid path expansion valve, a manual expansion valve, a pressure regulating valve and an evaporator; the evaporator is arranged between the main liquid path expansion valve and the compressor, the outlet of the condenser is communicated with the inlet of one side of the economizer, the outlet of one side of the economizer is communicated with the main liquid path expansion valve, and the outlet of the other side of the economizer is communicated with the middle air suction port of the compressor; the inlet on the other side of the economizer is connected with a manual expansion valve which is communicated with a pressure regulating valve, and the pressure regulating valve is communicated between the condenser and the economizer or between the economizer and the main liquid path expansion valve.
By adopting the technical scheme, the refrigerant is condensed into a liquid state before entering the economizer, has a primary supercooling degree and is usually about 3-5 ℃. After entering the economizer, the refrigerant of the main loop exchanges heat with the refrigerant of the bypass loop to realize secondary supercooling, wherein the secondary supercooling degree is about 10 ℃. In order to realize the temperature difference between the main road side and the bypass circuit side, the bypass circuit refrigerant takes liquid from the main road outlet, passes through the pressure regulating valve and then flows through the manual expansion valve for primary throttling. The throttled refrigerant is subjected to heat exchange and evaporation in the economizer to become a medium-pressure gaseous refrigerant with a certain superheat degree, and then enters an intermediate air suction port of the compressor. The refrigerant of the main loop realizes secondary supercooling through heat exchange, the enthalpy value of the refrigerant is effectively reduced, and the enthalpy difference of unit mass flow is greatly improved, so that the refrigerating capacity of the unit is improved by 10-15%. The middle suction of the compressor causes the compressor to work and lift slightly. Generally, after the economizer is adopted for circulation, the refrigerating efficiency can be improved by 5-10%, and the improvement range tends to increase along with the increase of the difference value of the evaporation pressure and the condensation pressure.
Has the advantages that: compared with the prior art, the utility model discloses following effect has:
the operation is simple: the method has the advantages that the point position is not required to be occupied, a pressure value is set on the pressure regulating valve, and the manual expansion valve is provided with a fixed opening; the cost is low: only one pressure regulating valve and one manual top cover valve are used without using components such as an electromagnetic valve, a thermal expansion valve, a pressure switch, an electronic expansion valve and the like; the failure rate is low: no electric element, few action parts and greatly reduced probability of failure and leakage.
Drawings
FIG. 1 is a schematic diagram of the structure of the downstream liquid extraction of the present invention;
fig. 2 is a schematic structural diagram of the upstream liquid taking of the present invention.
Detailed Description
As shown in fig. 1, a precision-adjusted refrigeration cycle system with an economizer mainly includes a condenser 1, an economizer 2, a compressor 3, a main liquid path expansion valve 4, a manual expansion valve 5, a pressure regulating valve 6 and an evaporator 7; the evaporator 7 is arranged between the main liquid path expansion valve 4 and the compressor 3, the outlet of the condenser 1 is communicated with the inlet of one side of the economizer 2, the outlet of one side of the economizer 2 is communicated with the main liquid path expansion valve 4, and the outlet of the other side of the economizer 2 is communicated with the middle air suction port of the compressor 3; the other side of the economizer 2 is connected with a manual expansion valve 5, the manual expansion valve 5 is communicated with a pressure regulating valve 6, and the pressure regulating valve 6 is communicated between the condenser 1 and the economizer 2 or between the economizer 2 and the main liquid path expansion valve 4.
An evaporator 7 is provided between the main liquid passage expansion valve 4 and the compressor 3, and the evaporator 7 includes a dry evaporator 7, a flooded evaporator 7, and a falling film evaporator 7.
The outlet of the compressor 3 communicates with the inlet of the condenser 1.
The pressure regulating valve 6 presets a pressure value in advance; during use, the manual expansion valve 5 is set to a fixed opening degree, and the liquid pushes the pressure regulating valve 6 open and passes through the manual expansion valve 5.
The economizer 2 is a plate-type economizer 2.
The working principle is as follows: the plate change economizer 2 is typically placed before the condenser 1 outlet and the main circuit electronic expansion valve. The refrigerant enters the condenser 1 and then enters the economizer 2, so that the refrigerant is condensed into a liquid state, has a primary supercooling degree and is usually about 3-5 ℃. After entering the economizer 2, the refrigerant of the main loop exchanges heat with the refrigerant of the bypass loop to realize secondary supercooling, wherein the secondary supercooling degree is about 10 ℃. Manually setting the value of the pressure regulating valve 6, wherein the set value is used as the pressure value for opening the economizer 2, and when the pressure is higher than the value, the regulating valve is opened, so that the economizer 2 is opened; when the pressure value is lower than the value, the regulating valve is closed, the economizer 2 is closed, and thus the automatic control of the switch of the economizer 2 is realized; the flow rate of the economizer 2 bypass circuit is determined by the opening of the head valve, and thus a fixed opening is manually set to achieve flow rate regulation.
Referring to fig. 1, in order to realize the temperature difference between the main circuit side and the bypass circuit side, a bypass circuit refrigerant is taken from between the economizer 2 and the main circuit expansion valve 4, passes through the pressure regulating valve 6, and then flows through the manual expansion valve 5 to be subjected to primary throttling.
Referring to fig. 2, in order to realize the temperature difference between the main circuit side and the bypass circuit side, or the bypass circuit refrigerant is taken from between the condenser 1 and the economizer 2, passes through the pressure regulating valve 6, and then flows through the manual expansion valve 5 for primary throttling.
The refrigerant after the primary throttling exchanges heat and evaporates in the economizer 2 to become a medium-pressure gaseous refrigerant with a certain superheat degree, and then enters a middle air suction port of the compressor 3. The refrigerant of the main loop realizes secondary supercooling through heat exchange, the enthalpy value of the refrigerant is effectively reduced, and the enthalpy difference of unit mass flow is greatly improved, so that the refrigerating capacity of the unit is improved by 10-15%. The intermediate suction of the compressor 3 causes a small increase in the work done by the compressor 3. Generally, after the economizer 2 is adopted for circulation, the refrigerating efficiency can be improved by 5-10%, and the improvement range tends to increase along with the increase of the difference value of the evaporation pressure and the condensation pressure.
Claims (5)
1. A precisely adjusted refrigeration cycle system with an economizer comprises a condenser (1), the economizer (2), a compressor (3), a main liquid path expansion valve (4), a manual expansion valve (5), a pressure adjusting valve (6) and an evaporator (7); the evaporator (7) is arranged between the main liquid path expansion valve (4) and the compressor (3), the outlet of the condenser (1) is communicated with the inlet of one side of the economizer (2), the outlet of one side of the economizer (2) is communicated with the main liquid path expansion valve (4), and the outlet of the other side of the economizer (2) is communicated with the middle suction port of the compressor (3); the economizer is characterized in that an inlet on the other side of the economizer (2) is connected with a manual expansion valve (5), the manual expansion valve (5) is communicated with a pressure regulating valve (6), and the pressure regulating valve (6) is communicated between the condenser (1) and the economizer (2) or between the economizer (2) and a main liquid path expansion valve (4).
2. The precision tuned refrigeration cycle system with economizer of claim 1, characterized in that the evaporator (7) comprises a dry evaporator, a flooded evaporator and a falling film evaporator.
3. Fine tuned refrigeration cycle system with economizer according to claim 1, characterized in that the outlet of the compressor (3) communicates with the inlet of the condenser (1).
4. The precision regulated refrigeration cycle with economizer of claim 1 characterized in that the pressure regulating valve (6) is preset with a pressure value in advance; during the use process of the manual expansion valve (5), a fixed opening degree is set for the manual expansion valve, and the liquid pushes the pressure regulating valve (6) open and passes through the manual expansion valve (5).
5. The precision tuned refrigeration cycle system with an economizer according to claim 1, characterized in that the economizer (2) is a plate-change economizer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921602873.4U CN210980415U (en) | 2019-09-25 | 2019-09-25 | Precise-adjustment refrigeration cycle system with economizer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921602873.4U CN210980415U (en) | 2019-09-25 | 2019-09-25 | Precise-adjustment refrigeration cycle system with economizer |
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| CN210980415U true CN210980415U (en) | 2020-07-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113048667A (en) * | 2021-03-22 | 2021-06-29 | 西安交通大学 | Mixed working medium refrigerating system with low-temperature storage box started quickly and control method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113048667A (en) * | 2021-03-22 | 2021-06-29 | 西安交通大学 | Mixed working medium refrigerating system with low-temperature storage box started quickly and control method |
| CN113048667B (en) * | 2021-03-22 | 2022-04-05 | 西安交通大学 | Mixed working medium refrigerating system with low-temperature storage box started quickly and control method |
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