CN116045536A - Falling film type semi-closed screw refrigerating unit - Google Patents
Falling film type semi-closed screw refrigerating unit Download PDFInfo
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- CN116045536A CN116045536A CN202211184707.3A CN202211184707A CN116045536A CN 116045536 A CN116045536 A CN 116045536A CN 202211184707 A CN202211184707 A CN 202211184707A CN 116045536 A CN116045536 A CN 116045536A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
- F25B1/04—Compression machines, plants or systems with non-reversible cycle with compressor of rotary type
- F25B1/047—Compression machines, plants or systems with non-reversible cycle with compressor of rotary type of screw type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B39/00—Evaporators; Condensers
- F25B39/02—Evaporators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B39/00—Evaporators; Condensers
- F25B39/04—Condensers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/02—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention discloses a falling film type semi-closed screw refrigerating unit, which comprises a semi-closed screw compressor, wherein the semi-closed screw compressor is arranged on a falling film evaporator, an air inlet of the semi-closed screw compressor is communicated with the falling film evaporator through an air suction pipeline, an air discharge stop check valve is arranged at an air outlet of the semi-closed screw compressor and is connected with an air discharge pipeline, the air discharge pipeline is connected with an external horizontal oil separator, the external horizontal oil separator is fixedly connected with the falling film evaporator, the falling film evaporator is connected with a shell-and-tube type condenser, the falling film type semi-closed screw refrigerating unit consists of a table or a table semi-closed screw compressor and is used for providing low-temperature cold water or saline and glycol solution required by air conditioning and other production, the falling film type semi-closed screw refrigerating unit is provided with an automatic refrigerating capacity control device, the multi-head water chilling unit can automatically start and close the number of compressors and adjust the energy level of each compressor according to the needs of users in the running process, and the unit is economical and efficient.
Description
Technical Field
The invention relates to the technical field of refrigerating units, in particular to a falling film type semi-closed screw refrigerating unit.
Background
The refrigerator is a common refrigeration device, also called a water chiller, can provide constant-temperature, constant-current and constant-pressure cooling water through refrigeration, is commonly used for cooling air or equipment, and is useful in the fields of electronic industry, ultrasonic cleaning industry, plastic industry, food industry, medicine industry, electroplating industry and the like. Besides cooling the equipment, the refrigerator can also be used as an air conditioner for cooling the air, but auxiliary equipment is needed to be matched, and a power distribution and control system and a pipeline system are manufactured.
The refrigerating machine mainly achieves a refrigerating effect through vapor compression or absorption type circulation, is commonly used for cooling air or equipment, is applied to various industries, and when a current refrigerating unit is started and closed, all compressors in the refrigerating unit are simultaneously started and closed, so that the running energy consumption of the unit is high, and particularly the compressors are started at a low position and are difficult to achieve small starting torque.
Disclosure of Invention
In order to solve the technical problems, the invention provides a falling film type semi-closed screw refrigerating unit, wherein a semi-closed screw compressor is arranged on a falling film evaporator, an air inlet of the semi-closed screw compressor is communicated with the falling film evaporator through an air suction pipeline, an air discharge stop check valve is arranged at an air outlet of the semi-closed screw compressor, the air discharge stop check valve is connected with an air discharge pipeline, the air discharge pipeline is connected with an external horizontal oil separator, the external horizontal oil separator is fixedly connected with the falling film evaporator, and the falling film evaporator is connected with a shell-and-tube condenser;
the semi-closed screw compressor is provided with an energy adjusting slide valve driven by an oil piston in a cylinder, and the semi-closed screw compressor realizes the graded adjustment of the refrigerating capacity within the range of 25-100 percent.
Preferably: and a control console is arranged on the falling film evaporator.
Preferably: the shell-and-tube condenser is connected with an external horizontal oil separator through a pipeline, and an outlet of the external horizontal oil separator is connected with a semi-closed screw compressor through a pipeline.
Preferably: an oil filter is connected to a pipeline at the outlet of the external horizontal oil separator, an exhaust stop check valve is connected to the air outlet of the semi-closed screw compressor, and the exhaust stop check valve is connected with the external horizontal oil separator through an exhaust pipeline.
Preferably: and an air inlet of the semi-closed screw compressor is connected with an air suction pipeline, the other end of the air suction pipeline is connected with an evaporator safety valve, and the evaporator safety valve is arranged on the falling film evaporator.
Preferably: the falling film evaporator is connected with the ejector through a pipeline, and an oil return brass ball valve and a second filter are arranged on the connected pipeline.
Preferably: the ejector is connected with the shell-and-tube condenser, the air suction pipeline and the shell-and-tube condenser through pipelines.
Preferably: the shell-and-tube condenser is connected with the falling film evaporator through a liquid supply pipeline, and a first liquid supply brass ball valve, a first filter, an electronic expansion valve and a second liquid supply brass ball valve are arranged on the liquid supply pipeline.
Preferably: the shell and tube condenser is connected with a condenser safety valve, and the condenser safety valve is used for being connected with a safety valve discharge port.
The invention has the technical effects and advantages that:
1. the falling film type semi-closed screw refrigerating unit is provided with an automatic refrigerating capacity control device, and the multi-head water chilling unit can automatically start and close the number of compressors and adjust the energy level of each compressor according to the needs of users in the running process, so that the unit is economical and efficient to run.
2. The efficient heat exchange tube has the advantages of small volume, good heat exchange effect, high heat transfer coefficient, less refrigerant filling amount and contribution to oil return.
3. The unit has multiple protections such as low suction pressure, high exhaust pressure, low suction and exhaust pressure difference, high exhaust temperature, low cold water outlet temperature, water interruption of an evaporator, dirty blockage of an oil filter, low oil level of a compressor, compressor faults, power faults and the like, so that the running reliability of the unit is improved, and unnecessary damage of the unit is avoided as far as possible.
4. Before the machine set leaves the factory, refrigerant and refrigerating oil are filled, and heat preservation treatment is carried out. The user can put into use by connecting the waterway and the electric circuit, and can install and operate in a short time.
Drawings
FIG. 1 is a general structure diagram of a falling film type semi-closed screw refrigerator provided in an embodiment of the present application;
FIG. 2 is a flow chart of a falling film type semi-closed screw refrigerating unit provided in an embodiment of the present application;
fig. 3 is a schematic diagram of an internal structure of a compressor in a falling film type semi-closed screw refrigerating unit according to an embodiment of the present application.
In the figure: 1. a shell-and-tube condenser; 2. external horizontal oil separator; 3. an exhaust line; 4. an exhaust gas shutoff check valve; 5. a semi-closed screw compressor; 501. an intake air filter; 502. an air inlet; 503. a motor; 504. an engine oil filter; 505. a suction end bearing; 506. a male rotor; 507. an exhaust end bearing; 508. a muffler pipe; 509. a first air outlet; 510. lubricating oil; 511. an oil filter screen; 512. a second air outlet; 513. a capillary tube; 514. a first electromagnetic valve; 515. a second electromagnetic valve; 516. a third electromagnetic valve; 517. a slide valve; 6. a liquid supply pipeline; 7. a console; 8. an air suction line; 9. a falling film evaporator; 10. an oil filter; 11. an ejector; 12. a condenser safety valve; 13. a first liquid-feeding brass ball valve; 14. a first filter; 15. an electronic expansion valve; 16. a second liquid-feeding brass ball valve; 17. an evaporator safety valve; 18. a second filter; 19. oil return brass ball valve.
Detailed Description
The invention will be described in further detail with reference to the drawings and the detailed description. The embodiments of the invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.
Referring to fig. 1, in the present embodiment, a falling film type semi-enclosed screw refrigerating unit is provided, which is composed of 1 or 2 semi-enclosed screw compressors 5, and includes: shell-and-tube condenser 1, semi-closed screw compressor 5, falling film evaporator 9, refrigerant system, oil circuit system, waterway system and control system, semi-closed screw compressor 5.
The falling film type semi-closed screw refrigerating unit has higher operation efficiency, and is characterized in that the evaporating temperature is generally 1-2 ℃ lower than the cold water outlet temperature of the evaporator, and the condensing temperature is 2-3 ℃ higher than the water outlet temperature of the condenser. The evaporation temperature is increased by 1 ℃, the unit cold quantity is increased by 3.5%, and the consumed power is basically unchanged; the condensing temperature is reduced by 1 ℃, the consumption power of a unit is reduced by 2%, and the cooling capacity is increased by 1%. This results in a higher suction pressure and a lower discharge pressure, i.e. a lower suction-discharge pressure difference, during start-up and operation of the unit. The semi-closed screw compressor 5 and the compression cavity adopted by the unit and the load increasing and decreasing oil supply are supplied by adopting the pressure difference of air suction and air exhaust, so that the pressure difference of air suction and air exhaust is not lower than 2bar, and the unit can be ensured to run reliably for a long time.
When the ambient temperature is lower, the falling film type semi-closed screw water chilling unit is started to operate, and one of the following 3 methods can be selected according to actual conditions:
1. the switch signal for controlling the cooling tower fan and the fan overload feedback signal are connected to corresponding terminals in the unit control cabinet (220 AC active switch signal is provided by the unit control cabinet), so that the cooling tower fan can be turned off when the outlet water temperature of the condenser is lower than 20 ℃ (the temperature can be set in the controller), and the outlet water temperature of the condenser is higher than 30 ℃ (the temperature can be set in the controller), and the cooling tower fan is turned on;
2. the frequency conversion of a cooling tower fan can be adopted or an automatic control measure of an electric bypass valve is added between water inlet and outlet pipes of the cooling tower so as to maintain the temperature of water outlet of a condenser of the unit not lower than 20 ℃;
3. the method of timely and manually switching on and off the cooling tower fan or manually controlling by adding a regulating valve between the water inlet pipe and the water outlet pipe of the cooling tower is adopted to maintain the outlet water temperature of the condenser of the unit at about 20 ℃.
The purpose of the 3 methods is to ensure that the exhaust pressure is in a reasonable range, so that enough suction and exhaust pressure difference is ensured to ensure that the starting loading process can be successfully completed.
The semi-closed screw compressor 5 is arranged on the falling film evaporator 9, an air inlet of the semi-closed screw compressor 5 is communicated with the falling film evaporator 9 through an air suction pipeline 8, an exhaust stop check valve 4 is arranged at an air outlet of the semi-closed screw compressor 5, the exhaust stop check valve 4 is connected with an exhaust pipeline 3, the exhaust pipeline 3 is connected with an external horizontal oil separator 2, the external horizontal oil separator 2 is fixedly connected with the falling film evaporator 9, the falling film evaporator 9 is connected with the shell-and-tube condenser 1, and a control console 7 is arranged on the falling film evaporator 9.
Referring to fig. 2, in this embodiment, a falling film type semi-closed screw refrigerating unit is provided, a shell-and-tube condenser 1 is connected with an external horizontal oil separator 2 through a pipeline, an outlet of the external horizontal oil separator 2 is connected with a semi-closed screw compressor 5 through a pipeline, a pipeline at the outlet of the external horizontal oil separator 2 is connected with an oil filter 10, an outlet of the semi-closed screw compressor 5 is connected with an exhaust stop check valve 4, the exhaust stop check valve 4 is connected with the external horizontal oil separator 2 through an exhaust pipeline 3, an air inlet of the semi-closed screw compressor 5 is connected with an air suction pipeline 8, the other end of the air suction pipeline 8 is connected with an evaporator safety valve 17, the evaporator safety valve 17 is installed on the falling film evaporator 9, the falling film evaporator 9 is connected with an ejector 11 through a pipeline, an oil return brass ball valve 19 and a second filter 18 are installed on the connected pipeline, the ejector 11 is connected with the shell-and-tube condenser 1 through a pipeline, the shell-and-tube condenser 1 is connected with the falling film evaporator 9 through a liquid supply pipeline 6, and a first liquid supply brass ball valve 13, a first brass filter 14, an electronic expansion valve 15 and a second brass supply valve 16 are installed on the liquid supply pipeline 6 for connecting the safety valve 12 with the safety valve 12.
The external horizontal oil separator 2 separates the refrigerant to obtain refrigerant gas, the refrigerant gas enters the shell-and-tube condenser 1, the heat load of the semi-closed screw compressor 5 and the falling film evaporator 9 is taken away by cooling water in copper tubes in the shell-and-tube condenser 1, the refrigerant gas is condensed into refrigerant liquid, the first liquid supply brass ball valve 13 is opened, the refrigerant liquid flows into the liquid supply pipeline 6, the refrigerant liquid is filtered by the first filter 14, enters the falling film evaporator 9 through the electronic expansion valve 15 and the second liquid supply brass ball valve 16, the refrigerant liquid starts to flash and cool after flowing through the electronic expansion valve 15, the refrigerant liquid evaporates outside copper tubes in the falling film evaporator 9, the heat of the refrigerant in the absorption tubes cools the refrigerant, the temperature of the refrigerant is lowered, the refrigerant outlet temperature is reduced, the refrigerant is supplied to the air-water heat exchanger in the central air conditioning system for cooling and air supply, and the refrigerant gas is conveyed to an air conditioning object through a pipeline, so that the internal air temperature is kept within a comfort range of a human body, and the refrigerant gas can also be used in a non-standard air conditioning working condition range required by other working chambers or used for cooling process equipment.
Example 2
Referring to fig. 3, in the present embodiment, a semi-closed screw compressor 5 is provided with an air inlet 502, an air inlet filter 501 is installed at the air inlet 502, a motor 503 is provided at the inner side of the air inlet filter 501, the motor 503 is connected with a male rotor 506 through a rotating shaft, the male rotor 506 has a convex tooth, power is inputted thereby, a female rotor (not shown in the figure) provided with a concave tooth in cooperation with the male rotor 506, the air suction ends of the male rotor 506 and the female rotor are provided with an air suction end bearing 505, the air discharge ends of the male rotor 506 and the female rotor are provided with an air discharge end bearing 507, the air suction end bearing 505 and the air discharge end bearing 507 are cylindrical roller bearings for bearing radial force, a pair of angular contact ball bearings (or a four-point contact ball bearing) are provided at the air discharge ends of the two rotors respectively, a slide valve 517 is provided at the upper portions of the male rotor 506 and the female rotor, the slide valve 517 is driven by the oil piston in the oil cylinder to regulate, the semi-closed screw compressor 5 is provided with an energy regulating slide valve driven by the oil piston in the cylinder at the upper part of the male rotor 506 and the female rotor, the energy regulating slide valve is controlled by an electromagnetic valve, the graded regulation of the refrigerating capacity can be realized within 25% -100%, the compressor can be ensured to be started at a low position so as to achieve small starting torque, the semi-closed screw compressor 5 adopts 4-level unloading, namely 100%, 75%, 50% and 25%, wherein 25% is only used for starting the semi-closed screw compressor 5, the oil cylinder is respectively connected with a capillary 513, a first electromagnetic valve 514, a second electromagnetic valve 515 and a third electromagnetic valve 516 through pipelines, one end of the pipeline connected with the capillary 513 is connected with the oil cylinder, the other end of the pipeline connected with the capillary 513 is positioned at the bottom of the semi-closed screw compressor 5 to form an oil circuit circulation system, the first electromagnetic valve 514, the second electromagnetic valve 515 is connected in parallel with the third electromagnetic valve 516, the engine oil filter 504 of the semi-closed screw compressor 5 is used for filtering lubricating oil 510 in the semi-closed screw compressor 5, an oil filter screen 511 is arranged in the semi-closed screw compressor 5 and far away from the air inlet 502, a silencing pipe 508 is arranged in the middle of the oil filter screen 511, a first air outlet 509 is arranged in the silencing pipe 508, and a second air outlet 512 is formed in the upper end of the semi-closed screw compressor 5 and located at one side of the oil filter screen 511.
The control system comprises a cooling water outlet temperature sensor connected with a cooling water outlet of the shell-and-tube condenser 1, a cooling water inlet temperature sensor connected with a cooling water inlet of the shell-and-tube condenser 1, a cooling water outlet of the falling film evaporator 9 is connected with an exhaust temperature sensor, a cooling water inlet of the falling film evaporator 9 is connected with a coolant inlet temperature sensor, an exhaust port of the falling film evaporator 9 is connected with an exhaust temperature sensor, an exhaust pipeline 3 connected with the semi-closed screw compressor 5 is provided with an exhaust temperature sensor, and the semi-closed screw compressor 5 is provided with an air suction pressure sensor, an exhaust pressure sensor and an oil injection pressure sensor
The working principle of the invention is as follows:
the semi-closed screw compressor and the compression cavity adopted by the unit and the load increasing and decreasing oil supply are both supplied by adopting the pressure difference of air suction and air exhaust, the external horizontal oil separator 2 separates the refrigerant to obtain refrigerant gas, the refrigerant gas enters the shell-and-tube condenser 1, the heat load of the semi-closed screw compressor 5 and the falling film evaporator 9 is taken away by cooling water in copper tubes in the shell-and-tube condenser 1, the refrigerant gas is condensed into refrigerant liquid, a first liquid supply brass ball valve 13 is opened, the refrigerant liquid flows into a liquid supply pipeline 6, after being filtered by a first filter 14, the refrigerant gas enters the falling film evaporator 9 through an electronic expansion valve 15 and a second liquid supply brass ball valve 16, and the refrigerant gas starts to flash and cool after flowing through the electronic expansion valve 15, the refrigerant liquid evaporates outside the copper pipe in the falling film evaporator 9, absorbs the heat of the refrigerating medium in the pipe to cool the refrigerating medium, the temperature of the refrigerating medium outlet is reduced, the refrigerating medium is provided for the air-water heat exchanger in the central air conditioning system to cool and supply air, the air is supplied to the air conditioning object through the pipeline, the air temperature in the air conditioning object is kept in the comfort range of human body, the air conditioning object can also be used in the range of nonstandard air conditioning working conditions required by other working chambers or used for cooling process equipment, the semi-closed screw compressor 5 is provided with an energy adjusting slide valve driven by the oil piston in the cylinder at the upper parts of the male rotor 506 and the female rotor, and the semi-closed screw compressor is controlled by an electromagnetic valve, so that the graded adjustment of the refrigerating capacity can be realized in the range of 25% -100%, and the compressor can be ensured to be started at a low position so as to achieve small starting torque.
It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art and which are included in the embodiments of the present invention without the inventive step, are intended to be within the scope of the present invention. Structures, devices and methods of operation not specifically described and illustrated herein, unless otherwise indicated and limited, are implemented according to conventional means in the art.
Claims (10)
1. A falling film semi-enclosed screw refrigeration unit comprising: the semi-closed screw compressor (5) is arranged on the falling film evaporator (9), an air inlet of the semi-closed screw compressor (5) is communicated with the falling film evaporator (9) through an air suction pipeline (8), an exhaust stop check valve (4) is arranged at an air outlet of the semi-closed screw compressor (5), the exhaust stop check valve (4) is connected with an exhaust pipeline (3), the exhaust pipeline (3) is connected with an external horizontal oil separator (2), the external horizontal oil separator (2) is fixedly connected with the falling film evaporator (9), and the falling film evaporator (9) is connected with a shell-and-tube condenser (1);
the semi-closed screw compressor (5) is provided with an energy adjusting slide valve driven by an oil piston in a cylinder, and the semi-closed screw compressor realizes the graded adjustment of the refrigerating capacity within the range of 25% -100%.
2. Falling film semi-enclosed screw refrigeration unit as claimed in claim 1, wherein the falling film evaporator (9) is fitted with a console (7).
3. The falling film type semi-closed screw refrigerating unit according to claim 1, wherein the shell and tube condenser (1) is connected with the external horizontal oil separator (2) through a pipeline, and the outlet of the external horizontal oil separator (2) is connected with the semi-closed screw compressor (5) through a pipeline.
4. A falling film type semi-closed screw refrigerating unit according to claim 3, wherein an oil filter (10) is connected to a pipeline at the outlet of the external horizontal oil separator (2), the gas outlet of the semi-closed screw compressor (5) is connected with a gas discharge stop check valve (4), and the gas discharge stop check valve (4) is connected with the external horizontal oil separator (2) through a gas discharge pipeline (3).
5. The falling film type semi-closed screw refrigerating unit according to claim 4, wherein an air inlet of the semi-closed screw compressor (5) is connected with an air suction pipeline (8), the other end of the air suction pipeline (8) is connected with an evaporator safety valve (17), and the evaporator safety valve (17) is arranged on the falling film evaporator (9).
6. Falling film semi-enclosed screw refrigeration unit as set forth in claim 5 wherein said falling film evaporator (9) is connected to the ejector (11) by a pipe and an oil return brass ball valve (19) and a second filter (18) are mounted on the connected pipe.
7. The falling film semi-closed screw refrigeration unit as set forth in claim 6 wherein the ejector (11) is connected to the shell and tube condenser (1), suction line (8) and shell and tube condenser (1) by tubing.
8. Falling film semi-enclosed screw refrigeration unit as claimed in claim 2, wherein the falling film evaporator (9) is connected to the ejector (11) by a pipe and an oil return brass ball valve (19) and a second filter (1) are mounted on the connected pipe.
9. Falling film semi-closed screw refrigeration unit as set forth in claim 1 wherein the shell and tube condenser (1) is connected to the falling film evaporator (9) by a feed line (6) and a first feed brass ball valve (13), a first filter (14), an electronic expansion valve (15) and a second feed brass ball valve (16) are mounted on the feed line (6).
10. The falling film semi-closed screw refrigeration unit as set forth in claim 9 wherein the shell and tube condenser (1) is connected to a condenser relief valve (12), the condenser relief valve (12) being adapted to be connected to a relief valve bleed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211184707.3A CN116045536A (en) | 2022-09-27 | 2022-09-27 | Falling film type semi-closed screw refrigerating unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211184707.3A CN116045536A (en) | 2022-09-27 | 2022-09-27 | Falling film type semi-closed screw refrigerating unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116045536A true CN116045536A (en) | 2023-05-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211184707.3A Pending CN116045536A (en) | 2022-09-27 | 2022-09-27 | Falling film type semi-closed screw refrigerating unit |
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| Country | Link |
|---|---|
| CN (1) | CN116045536A (en) |
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2022
- 2022-09-27 CN CN202211184707.3A patent/CN116045536A/en active Pending
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