Screw type semi-closed one-machine dual-purpose integrated cold water and flake ice refrigerating unit

Abstract

The utility model discloses a screw-type semi-closed one-machine dual-purpose integrated cold water and flake ice refrigerating unit which comprises a screw-type refrigerating compressor. The plate exchange type condenser is connected with the screw type refrigeration compressor, and the compressed gas refrigerant is condensed into a liquid refrigerant through the plate exchange type condenser; the cooling tower is connected with the plate exchange type condenser and is used for cooling water for the plate exchange type condenser; the screw type refrigeration compressor has the advantages that the problem that in the refrigeration industry for many years, two refrigeration systems which are combined together and have large difference in requirements for two working conditions at the same time is solved, and the screw type refrigeration compressor is connected with the economizer, so that the operation efficiency of the screw type refrigeration compressor is improved. Independent systems are made for operation according to various working conditions, so that the problem that a compressor sucks wet steam to cause the failure of shaft sticking is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigeration systems, and in particular to a screw-type semi-enclosed dual-purpose integrated cold water and flake ice refrigeration unit. Background Art

[0002] As an important measure for the country to promote clean energy construction and improve the natural environment, the country will push various power construction companies to build dozens of large, medium and small pumped storage hydropower stations. An important requirement for the construction of pumped storage hydropower stations is to ensure the quality of the dam body, which is the temperature control in the concrete production process. However, the production volume of temperature-controlled concrete in some relatively small-scale pumped storage hydropower stations is not very large. If construction units such as China Power Construction and China Energy Construction contract the concrete construction process according to the traditional practice, they will purchase two sets of refrigeration units, one for making chilled water and the other for making flake ice, which will not only take up space, but also increase energy consumption and investment.

[0003] In food processing, after the chickens and ducks are slaughtered and feathered, if they are not pre-cooled, the skin of fried chicken legs will turn outward, which is not only unsightly but also affects the taste. Therefore, after feathering, they must be pre-cooled before entering the next processing step. The cold water supply of traditional chillers is insufficient, and the energy consumption increases if the chillers are oversized. Therefore, a set of chillers + a set of ice making devices are required to achieve pre-cooling.

[0004] If the chilled water system and the flake ice making system are integrated together, the evaporation temperature difference between the two working conditions is too large, which can easily cause the evaporated refrigerant liquid to enter the suction end of the compressor, causing the compressor to jam. For many years, the refrigeration industry has adopted the method of running two refrigeration systems together and running them separately according to their working conditions to avoid the compressor sucking wet vapor and causing the shaft to jam, not to mention using a refrigeration compressor for two refrigeration systems with very different operating conditions.

[0005] Therefore, there is an urgent need for a screw-type semi-enclosed dual-purpose integrated cold water and flake ice refrigeration unit to solve the problems mentioned in the above background technology. Utility Model Content

[0006] The utility model aims to provide a screw-type semi-enclosed dual-purpose integrated cold water and flake ice refrigeration unit to solve the problems raised in the above-mentioned background technology.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] Screw type semi-hermetic dual-purpose integrated cold water and flake ice refrigeration unit, including:

[0009] Screw refrigeration compressor;

[0010] A plate exchange condenser, the plate exchange condenser is connected to the screw refrigeration compressor, and the compressed gas refrigerant is condensed into liquid refrigerant through the plate exchange condenser;

[0011] A cooling tower, the cooling tower is connected to the plate exchange condenser and is used to cool the water used for the plate exchange condenser;

[0012] An economizer, the economizer being connected to a screw refrigeration compressor, and the operating efficiency of the screw refrigeration compressor being improved by the economizer;

[0013] A gas-liquid separator, the gas-liquid separator is connected to the screw refrigeration compressor, the gas-liquid separator is used to separate gas to the screw refrigeration compressor for compression, the pipeline connecting the gas-liquid separator and the screw refrigeration compressor and the outlet of the screw refrigeration compressor are also connected to an oil cooler, and an angle valve is installed at the connection between the oil cooler and the gas-liquid separator and the screw refrigeration compressor connecting pipeline;

[0014] A flake ice machine, wherein the flake ice machine is connected to a gas-liquid separator, through which the throttled refrigerant is heat-exchanged with water to form flake ice, and the flake ice machine is also connected to a plate exchange evaporator, for evaporating the refrigerant into a gas-liquid mixture and transporting it to the gas-liquid separator, wherein a pressure maintaining valve is also installed on the connecting pipeline between the plate exchange evaporator and the flake ice machine.

[0015] Preferably: the exhaust port of the screw refrigeration compressor is connected to the air inlet of the oil separator, and a pressure sensor is installed on the pipeline connecting the screw refrigeration compressor and the oil separator to detect whether the high pressure in the system meets the current operating conditions.

[0016] Preferably, the oil return port at the bottom of the oil separator is connected to the air inlet pipeline of the screw refrigeration compressor after passing through an oil filter and an oil return solenoid valve, and the oil separator outlet is connected to the plate exchange condenser inlet through a pressure maintaining valve.

[0017] Preferably, the outlet of the plate exchange condenser is connected to the inlet of the liquid reservoir, and a pressure sensor is installed on the pipeline connecting the plate exchange condenser and the liquid reservoir to detect whether the medium pressure in the system meets the current operating conditions.

[0018] Preferably: the outlet of the liquid reservoir is a shunt pipeline with two routes for outputting refrigerant, the two shunt pipelines of the liquid reservoir outlet are both connected to the two inlets of the economizer, one of the shunt pipelines of the liquid reservoir enters the inlet of the economizer after passing through a filter, a solenoid valve, and a thermal expansion valve, and then is connected to the screw refrigeration compressor from the other outlet of the economizer.

[0019] Preferably, the economizer outlet is connected to the plate exchange evaporator inlet through a main liquid supply solenoid valve, and a pressure temperature sensor and a temperature sensor are installed at the plate exchange evaporator inlet.

[0020] Preferably: the plate-exchange evaporator outlet is connected to the gas-liquid separator inlet, a pressure and temperature sensor is installed on the pipe connecting the plate-exchange evaporator outlet and the gas-liquid separator, a pressure regulating valve is installed at the plate-exchange evaporator outlet and is connected to the ice-making evaporator return air pipe, and the gas-liquid separator outlet is connected to the screw refrigeration compressor inlet.

[0021] Preferably, each evaporation section of the flake ice machine is provided with an electronic expansion valve.

[0022] Compared with the prior art, the utility model has the following beneficial effects: the utility model transmits the condensed medium-temperature and medium-pressure liquid refrigerant to the liquid supply section of a 15-ton flake ice machine through a liquid storage device through a liquid supply pipeline; the low-temperature and low-pressure refrigerant enters the ice bucket coil evaporator of the flake ice machine after throttling by an electronic expansion valve to evaporate and absorb the heat of the water on the inner wall of the ice bucket evaporator, so that the water quickly freezes into flake ice, and the working state of the flake ice machine reaches an evaporation temperature of -23 degrees or below to achieve flake ice making and ensure the quality of flake ice; at the same time, the liquid storage device supplies liquid to the plate exchange evaporator through a liquid supply pipe and a liquid supply solenoid valve, and a chilled water circulation pump sends normal temperature water into the plate exchange evaporator to mix with the R22 entering the other side of the plate exchange evaporator. The refrigerant undergoes heat exchange, and absorbs the heat of the room temperature water and evaporates to the outlet of the plate exchange evaporator. The evaporation pressure after making chilled water is significantly different from the evaporation pressure of the Freon evaporated by the flake ice mechanism. Therefore, an evaporation pressure regulating valve is used to adjust the evaporation pressure of the low-temperature and low-pressure Freon after the outlet of the plate exchange evaporator, so that its pressure is close to or consistent with the evaporation pressure of the Freon evaporated after the flake ice mechanism. The Freon evaporated by the two paths through the evaporator is sucked into a gas-liquid separator under the condition of keeping the evaporation pressure consistent. After the gas-liquid separator, the Freon gas at room temperature and pressure is formed and sucked into the screw compressor again and compressed again to form a complete refrigeration cycle with two uses in one machine.

[0023] This has solved the problem in the refrigeration industry for many years of combining two refrigeration systems to serve two systems with very different working conditions. The systems are now operated as separate systems according to their respective working conditions to avoid the compressor sucking in wet steam and causing shaft jamming. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of a screw-type semi-enclosed dual-purpose integrated cold water and flake ice refrigeration unit is shown.

[0025] In the figure: 1. Screw refrigeration compressor; 2. Plate exchange condenser; 3. Cooling tower; 4. Economizer; 5. Electronic expansion valve; 6. Plate exchange evaporator; 7. Pressure maintaining valve; 8. Flake ice machine; 9. Gas-liquid separator; 10. Oil separator; 11. Oil cooler; 12. Liquid storage tank. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] See also Figure 1 , the utility model provides a technical solution:

[0028] The screw-type semi-enclosed dual-purpose integrated cold water and flake ice refrigeration unit comprises: a screw refrigeration compressor 1, a plate exchange condenser 2 connected to the screw refrigeration compressor 1, through which the compressed gas refrigerant is condensed into liquid refrigerant, a cooling tower 3 connected to the plate exchange condenser 2, used for cooling the water used for the plate exchange condenser 2, an economizer 4 connected to the screw refrigeration compressor 1, through which the operating efficiency of the screw refrigeration compressor 1 is improved, and a gas-liquid separator 9 connected to the screw refrigeration compressor 1, used for separating gas to the screw refrigeration compressor 1 for compression The pipeline connecting the gas-liquid separator 9 and the screw refrigeration compressor 1 and the outlet of the screw refrigeration compressor 1 are also connected to the oil cooler 11. An angle valve is installed at the connection between the oil cooler 11 and the pipeline connecting the gas-liquid separator 9 and the screw refrigeration compressor 1. The flake ice machine 8 is connected to the gas-liquid separator 9. The throttled refrigerant is heat-exchanged with water to form flake ice through the flake ice machine 8. The flake ice machine 8 is also connected to the plate exchange evaporator 6, which is used to evaporate the refrigerant and turn it into a gas-liquid mixture and transport it to the gas-liquid separator 9. A pressure maintaining valve 7 is also installed on the connecting pipeline between the plate exchange evaporator 6 and the flake ice machine 8.

[0029] The exhaust port of the screw refrigeration compressor 1 is connected to the air inlet of the oil separator 10. A pressure sensor is installed on the pipeline connecting the screw refrigeration compressor 1 and the oil separator 10 to detect whether the high pressure in the system meets the current operating conditions.

[0030] The oil return port at the bottom of the oil separator 10 is connected to the air inlet pipeline of the screw refrigeration compressor 1 after passing through the oil filter and the oil return solenoid valve, and the outlet of the oil separator 10 is connected to the inlet of the plate exchange condenser 2 through the pressure maintaining valve 7.

[0031] The outlet of the plate exchange condenser 2 is connected to the inlet of the liquid reservoir 12. A pressure sensor is installed on the pipeline connecting the plate exchange condenser 2 and the liquid reservoir 12 to detect whether the medium pressure in the system meets the current operating conditions.

[0032] The outlet of the liquid storage tank 12 is a shunt pipeline with two routes for outputting the refrigerant. The two shunt pipelines at the outlet of the liquid storage tank 12 are both connected to the two inlets of the economizer 4. One of the shunt pipelines of the liquid storage tank 12 enters the inlet of the economizer 4 after passing through a filter, a solenoid valve, and a thermal expansion valve, and then is connected to the screw refrigeration compressor 1 from the other outlet of the economizer 4. The liquid storage tank 12 supplies liquid to the plate exchange evaporator 6 through a liquid supply pipe and a liquid supply solenoid valve. A chilled water circulation pump delivers normal temperature water into the plate exchange evaporator 6, and performs heat exchange with the R22 refrigerant entering the other side of the plate exchange evaporator 6. The refrigerant absorbs the heat of the normal temperature water and evaporates to the outlet of the plate exchange evaporator 6.

[0033] The outlet of the economizer 4 is connected to the inlet of the plate exchange evaporator 6 through the main liquid supply solenoid valve. The inlet of the plate exchange evaporator 6 is installed with a pressure temperature sensor and a temperature sensor.

[0034] The outlet of the plate-exchange evaporator 6 is connected to the inlet of the gas-liquid separator 9. Pressure and temperature sensors are installed on the pipeline connecting the outlet of the plate-exchange evaporator 6 and the gas-liquid separator 9. A pressure regulating valve is installed at the outlet of the plate-exchange evaporator 6 and is connected to the return air pipeline of the ice-making evaporator. The outlet of the gas-liquid separator 9 is connected to the inlet of the screw refrigeration compressor 1.

[0035] Each evaporation section of the flake ice machine 8 is provided with an electronic expansion valve 5. The flake ice machine 8 is a 15-ton flake ice machine and includes four evaporation sections. The flake ice machine works at an evaporation temperature of -23 degrees or below to achieve flake ice making and ensure the quality of the flake ice.

[0036] Specifically, the above-mentioned screw-type semi-enclosed dual-purpose integrated cold water and flake ice refrigeration unit is implemented through the following principles:

[0037] like Figure 1 As shown, the exhaust port of the screw refrigeration compressor 1 is connected to the air inlet of the oil separator 10, and a pressure sensor is installed on the pipeline to detect whether the high pressure in the system meets the current operating conditions;

[0038] The oil return port at the bottom of the oil separator 10 passes through the first oil filter and the stop valve, and four branches are separated from the main pipe: the No. 1 branch pipe passes through the ball valve, and then passes through the original oil filter. The oil pressure difference controller is installed before and after the oil filter. After passing through the ball valve, it passes through the oil flow switch, and then passes through the solenoid valve and the sight glass, and is connected to the oil supply port of the No. 1 screw refrigeration compressor 1; the No. 2 branch pipe passes through the ball valve, and then passes through the original oil filter. The oil pressure difference controller is installed before and after the oil filter. After passing through the ball valve, it passes through the oil flow switch, and then passes through the solenoid valve and the sight glass, it is connected to the oil supply port of the No. 1 screw refrigeration compressor 1. The oil supply port of the No. 2 screw refrigeration compressor 1 is connected; the No. 3 branch pipe passes through the ball valve, then passes through the original oil filter, the oil pressure difference controller is installed before and after the oil filter, and then passes through the ball valve, passes through the oil flow switch, and then passes through the solenoid valve and the sight glass, and is connected to the oil supply port of the No. 3 screw refrigeration compressor 1; the No. 4 branch pipe passes through the ball valve, then passes through the original oil filter, the oil pressure difference controller is installed before and after the oil filter, and then passes through the ball valve, passes through the oil flow switch, and then passes through the solenoid valve and the sight glass, and is connected to the oil supply port of the No. 4 screw refrigeration compressor 1;

[0039] The outlet of the oil separator 10 passes through the stop check valve and then is connected to the six inlets of the evaporative condenser 2 through the pressure maintaining valve 7. A safety valve and a vent valve are installed on the pipeline.

[0040] like Figure 1 As shown, the outlet of the evaporative condenser 2 is connected to the inlet of the liquid storage device, and a pressure sensor is installed on the pipeline to detect whether the medium pressure in the system meets the current operating conditions;

[0041] The refrigerant flows out from the outlet of the liquid storage tank and is connected to four economizers 4. Each economizer 4 has two inlets and two outlets. Four branch pipes are separated from the main liquid supply pipeline, which are respectively connected to the four economizers 4. After passing through the filter, the solenoid valve, and the thermal expansion valve, the refrigerant enters the inlet of the economizer 4, and then is connected to the air supply port of each screw refrigeration compressor 1 from another outlet.

[0042] The outlets of the four economizers 4 are connected to the liquid supply main pipe at a vertical height of 30m after passing through the main liquid supply solenoid valve and the stop valve. Each plate exchange evaporator 6 has four inlets numbered first, second, third and fourth and four corresponding outlets numbered first, second, third and fourth. The liquid supply main pipe is divided into branch pipes No. 1, No. 2, No. 3 and No. 4, which are connected to the plate exchange evaporators 6 No. 1, No. 2, No. 3 and No. 4;

[0043] Among them, it should be noted that:

[0044] like Figure 1As shown, after the No. 1 branch pipe passes through the first ball valve, the first filter, the first ball valve, the first solenoid valve, the first thermal expansion valve, and the first liquid distributor, it is firstly connected to the inlet of the No. 1 plate exchange evaporator 6; after the No. 1 branch pipe passes through the second ball valve, the second filter, the second ball valve, the second solenoid valve, the second thermal expansion valve, and the second liquid distributor, it is secondly connected to the inlet of the No. 1 plate exchange evaporator 6; after the No. 1 branch pipe passes through the third ball valve, the third filter, the third ball valve, the third solenoid valve, the third thermal expansion valve, and the third liquid distributor, it is thirdly connected to the inlet of the No. 1 plate exchange evaporator 6; after the No. 1 branch pipe passes through the fourth ball valve, the fourth filter, the fourth ball valve, the fourth solenoid valve, the fourth thermal expansion valve, and the fourth liquid distributor, it is fourthly connected to the inlet of the No. 1 plate exchange evaporator 6;

[0045] Among them, it is also necessary to explain:

[0046] like Figure 1 As shown, after the No. 2 branch pipe passes through the first ball valve, the first filter, the first ball valve, the first solenoid valve, the first thermal expansion valve, and the first liquid distributor, it is firstly connected to the inlet of the No. 2 plate exchange evaporator 6; after the No. 2 branch pipe passes through the second ball valve, the second filter, the second ball valve, the second solenoid valve, the second thermal expansion valve, and the second liquid distributor, it is secondly connected to the inlet of the No. 2 plate exchange evaporator 6; after the No. 2 branch pipe passes through the third ball valve, the third filter, the third ball valve, the third solenoid valve, the third thermal expansion valve, and the third liquid distributor, it is thirdly connected to the inlet of the No. 2 plate exchange evaporator 6; after the No. 2 branch pipe passes through the fourth ball valve, the fourth filter, the fourth ball valve, the fourth solenoid valve, the fourth thermal expansion valve, and the fourth liquid distributor, it is fourthly connected to the inlet of the No. 2 plate exchange evaporator 6;

[0047] Among them, it should be noted that:

[0048] like Figure 1 As shown, after the No. 3 branch pipe passes through the first ball valve, the first filter, the first ball valve, the first solenoid valve, the first thermal expansion valve, and the first liquid distributor, it is firstly connected to the inlet of the No. 3 plate exchange evaporator 6; after the No. 3 branch pipe passes through the second ball valve, the second filter, the second ball valve, the second solenoid valve, the second thermal expansion valve, and the second liquid distributor, it is secondly connected to the inlet of the No. 3 plate exchange evaporator 6; after the No. 3 branch pipe passes through the third ball valve, the third filter, the third ball valve, the third solenoid valve, the third thermal expansion valve, and the third liquid distributor, it is thirdly connected to the inlet of the No. 3 plate exchange evaporator 6; after the No. 3 branch pipe passes through the fourth ball valve, the fourth filter, the fourth ball valve, the fourth solenoid valve, the fourth thermal expansion valve, and the fourth liquid distributor, it is fourthly connected to the inlet of the No. 3 plate exchange evaporator 6;

[0049] Among them, it is also necessary to explain:

[0050] like Figure 1As shown, after the No. 4 branch pipe passes through the first ball valve, the first filter, the first ball valve, the first solenoid valve, the first thermal expansion valve, and the first liquid distributor, it is firstly connected to the inlet of the No. 4 plate exchange evaporator 6; after the No. 4 branch pipe passes through the second ball valve, the second filter, the second ball valve, the second solenoid valve, the second thermal expansion valve, and the second liquid distributor, it is secondly connected to the inlet of the No. 4 plate exchange evaporator 6; after the No. 4 branch pipe passes through the third ball valve, the third filter, the third ball valve, the third solenoid valve, the third thermal expansion valve, and the third liquid distributor, it is thirdly connected to the inlet of the No. 4 plate exchange evaporator 6; after the No. 4 branch pipe passes through the fourth ball valve, the fourth filter, the fourth ball valve, the fourth solenoid valve, the fourth thermal expansion valve, and the fourth liquid distributor, it is fourthly connected to the inlet of the No. 4 plate exchange evaporator 6;

[0051] No. 1, No. 2, No. 3, and No. 4 plate exchange evaporators 6, each of which has four outlets, namely, the first, second, third, and fourth outlets, which are connected to four corresponding return air branch pipes of No. 1, No. 2, No. 3, and No. 4;

[0052] The first, second, third and fourth outlets on the No. 1 plate exchange evaporator 6 are connected to the No. 1 return air branch pipe, the first, second, third and fourth outlets on the No. 2 plate exchange evaporator 6 are connected to the No. 2 return air branch pipe, the first, second, third and fourth outlets on the No. 3 plate exchange evaporator 6 are connected to the No. 3 return air branch pipe, and the first, second, third and fourth outlets on the No. 4 plate exchange evaporator 6 are connected to the No. 4 return air branch pipe;

[0053] Four return air branches, No. 1, No. 2, No. 3 and No. 4, are connected to a return air main pipe, which is connected to the inlet of the gas-liquid separator 9 through a stop valve. Pressure and temperature sensors are installed on the pipeline. The outlet of the gas-liquid separator 9 is connected to the return air main pipe of the screw refrigeration compressor 1 after passing through the stop valve. The return air main pipe of the screw refrigeration compressor 1 divides into four return air branches, No. 1, No. 2, No. 3 and No. 4, which are connected to the No. 1, No. 2, No. 3 and No. 4 screw refrigeration compressors 1 respectively. The No. 1 return air branch After passing through the first stop valve and the first suction filter, the No. 1 screw refrigeration compressor 1 suction port is connected to the No. 2 return air branch pipe, after passing through the second stop valve and the second suction filter, the No. 2 screw refrigeration compressor 1 suction port is connected to the No. 3 screw refrigeration compressor 1 suction port is connected to the No. 3 return air branch pipe after passing through the third stop valve and the third suction filter, the No. 4 return air branch pipe is connected to the No. 4 screw refrigeration compressor 1 suction port after passing through the fourth stop valve and the fourth suction filter;

[0054] Based on the above principle, the implementation process of the dual-purpose refrigeration system is as follows:

[0055] This system uses a liquid storage device to transport the condensed medium-temperature and medium-pressure liquid refrigerant to the liquid supply section of a 15-ton flake ice machine through a liquid supply pipeline. The low-temperature and low-pressure refrigerant enters the ice bucket coil evaporator of the flake ice machine after throttling by an electronic expansion valve to evaporate and absorb the heat of the water on the inner wall of the ice bucket evaporator, so that the water quickly freezes into flake ice, and the working state of the flake ice machine reaches an evaporation temperature of -23 degrees or below to achieve flake ice production and ensure the quality of flake ice. At the same time, the liquid storage device supplies liquid to the plate exchange evaporator through a liquid supply pipe and a liquid supply solenoid valve, and a chilled water circulation pump sends normal temperature water into the plate exchange evaporator to exchange heat with the R22 refrigerant entering the other side of the plate exchange evaporator to produce ice. The refrigerant absorbs the heat of the room temperature water and evaporates to the outlet of the plate exchange evaporator. The evaporation pressure after making chilled water is significantly different from the evaporation pressure of the Freon evaporated by the flake ice mechanism. Therefore, an evaporation pressure regulating valve is used to adjust the evaporation pressure of the low-temperature and low-pressure Freon after the outlet of the plate exchange evaporator to make its pressure close to or consistent with the evaporation pressure of the Freon evaporated after the flake ice mechanism. The Freon evaporated through the evaporator in two ways is sucked into a gas-liquid separator while the evaporation pressure remains the same. After the gas-liquid separator, the Freon gas at room temperature and pressure is formed and sucked into the screw compressor again and compressed again to form a complete refrigeration cycle with two uses.

[0056] During the above implementation process, it should be noted that:

[0057] The liquid supply height of this refrigeration system is as high as 30m. Each plate exchange evaporator is equipped with four thermal expansion valves. The evaporation area of ​​a single thermal expansion valve is 250㎡, the cooling capacity is ≈37.5KW, the evaporation temperature is -17℃, the condensation temperature is +35℃, the liquid supply subcooling is 18K, and the saturated liquid density of R507 at 30℃ is 1021.9kg / m 3 For every meter increase in the liquid supply height, the pressure drops to 0.1022 bar. When the liquid supply height reaches 30m, the pressure drop is 3.02 bar. Combined with the loss of pipes in the system, the total pressure drop of the system liquid supply is about 3.6 bar.

[0058] It should be noted that before the specific implementation method is implemented, the difference between the saturated liquid temperature corresponding to the condenser condensing pressure and the actual temperature of the condenser outlet liquid is calculated, the subcooling degree of the expansion valve selection is 10K, and then the expansion valve is selected through Danfoss software to select a suitable thermal expansion valve.

[0059] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0060] In addition, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first", "second", "third" and "fourth" may explicitly or implicitly include at least one of such features.

[0061] In the present utility model, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the utility model according to the specific circumstances.

[0062] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A screw-type semi-enclosed dual-purpose integrated cold water and flake ice refrigeration unit, characterized in that: include: Screw refrigeration compressor (1); A plate exchange condenser (2), the plate exchange condenser (2) being connected to the screw refrigeration compressor (1), and condensing the compressed gas refrigerant into liquid refrigerant through the plate exchange condenser (2); A cooling tower (3), the cooling tower (3) being connected to the plate exchange condenser (2) and used for cooling water used in the plate exchange condenser (2); An economizer (4), wherein the economizer (4) is connected to the screw refrigeration compressor (1); A gas-liquid separator (9), the gas-liquid separator (9) being connected to the screw refrigeration compressor (1), the gas-liquid separator (9) being used to separate gas and send it to the screw refrigeration compressor (1) for compression, and the pipeline connecting the gas-liquid separator (9) and the screw refrigeration compressor (1) and the outlet of the screw refrigeration compressor (1) are also connected to an oil cooler (11); A flake ice machine (8), the flake ice machine (8) being connected to a gas-liquid separator (9), and the flake ice machine (8) being also connected to a plate-exchange evaporator (6), wherein a pressure maintaining valve (7) is also installed on the connecting pipeline between the plate-exchange evaporator (6) and the flake ice machine (8).

2. The screw-type semi-enclosed dual-purpose integrated cold water and flake ice refrigeration unit according to claim 1, characterized in that: The exhaust port of the screw refrigeration compressor (1) is connected to the air inlet of the oil separator (10), and a pressure sensor is installed on the pipeline connecting the screw refrigeration compressor (1) and the oil separator (10) to detect whether the high pressure in the system meets the current operating conditions.

3. The screw-type semi-enclosed dual-purpose integrated cold water and flake ice refrigeration unit according to claim 2, characterized in that: The oil return port at the bottom of the oil separator (10) is connected to the air inlet pipeline of the screw refrigeration compressor (1) after passing through an oil filter and an oil return solenoid valve, and the outlet of the oil separator (10) is connected to the inlet of the plate exchange condenser (2) through a pressure maintaining valve (7).

4. The screw-type semi-enclosed dual-purpose integrated cold water and flake ice refrigeration unit according to claim 3, characterized in that: The outlet of the plate exchange condenser (2) is connected to the inlet of the liquid reservoir (12), and a pressure sensor is installed on the pipeline connecting the plate exchange condenser (2) and the liquid reservoir (12) to detect whether the medium pressure in the system meets the current operating conditions.

5. The screw-type semi-enclosed dual-purpose integrated cold water and flake ice refrigeration unit according to claim 4, characterized in that: The outlet of the liquid storage tank (12) is a shunt pipeline with two routes for outputting refrigerant. The two shunt pipelines at the outlet of the liquid storage tank (12) are both connected to the two inlets of the economizer (4). One of the shunt pipelines of the liquid storage tank (12) enters the inlet of the economizer (4) through a filter, a solenoid valve, and a thermal expansion valve, and then is connected to the screw refrigeration compressor (1) from the other outlet of the economizer (4).

6. The screw-type semi-enclosed dual-purpose integrated cold water and flake ice refrigeration unit according to claim 5, characterized in that: The outlet of the economizer (4) is connected to the inlet of the plate exchange evaporator (6) through the main liquid supply solenoid valve. The inlet of the plate exchange evaporator (6) is equipped with a pressure temperature sensor and a temperature sensor.

7. The screw-type semi-enclosed dual-purpose integrated cold water and flake ice refrigeration unit according to claim 6, characterized in that: The outlet of the plate-exchange evaporator (6) is connected to the inlet of the gas-liquid separator (9); a pressure and temperature sensor is installed on the pipeline connecting the outlet of the plate-exchange evaporator (6) and the gas-liquid separator (9); a pressure regulating valve is installed at the outlet of the plate-exchange evaporator (6) and is connected to the return air pipeline of the ice-making evaporator; and the outlet of the gas-liquid separator (9) is connected to the inlet of the screw refrigeration compressor (1).

8. The screw-type semi-enclosed dual-purpose integrated cold water and flake ice refrigeration unit according to claim 1, characterized in that: Each evaporation section of the flake ice machine (8) is provided with an electronic expansion valve (5).

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