CN220103441U - Screw refrigerating unit - Google Patents
Screw refrigerating unit Download PDFInfo
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- CN220103441U CN220103441U CN202321573328.3U CN202321573328U CN220103441U CN 220103441 U CN220103441 U CN 220103441U CN 202321573328 U CN202321573328 U CN 202321573328U CN 220103441 U CN220103441 U CN 220103441U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 134
- 239000003921 oil Substances 0.000 claims abstract description 44
- 239000010687 lubricating oil Substances 0.000 claims abstract description 36
- 239000003507 refrigerant Substances 0.000 claims abstract description 24
- 238000001816 cooling Methods 0.000 claims abstract description 10
- 238000005057 refrigeration Methods 0.000 claims description 18
- 239000007921 spray Substances 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 10
- 238000004378 air conditioning Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000010259 detection of temperature stimulus Effects 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
The utility model provides a screw refrigerating unit, which comprises a screw compressor, an oil separator, an evaporative condenser and a shell-and-tube heat exchanger which are connected, wherein the shell-and-tube heat exchanger exchanges heat with a refrigerant to convey cold water outwards, and the screw refrigerating unit also comprises a second heat exchanger which is used for exchanging heat and cooling lubricating oil; one side of the second heat exchanger is respectively connected with the oil separator and the screw compressor, the other side of the second heat exchanger is connected with a water tank, and the water tank is used for conveying domestic hot water to a user. The screw refrigerating unit can transfer the heat of the lubricating oil to the domestic water in the water tank, so that the screw refrigerating unit can supply domestic hot water to a user while refrigerating, and simultaneously reduce the temperature of the lubricating oil to improve the running stability and reliability of the screw refrigerating unit, and simultaneously realize the full utilization of energy.
Description
Technical Field
The utility model relates to the technical field of refrigeration devices, in particular to a screw refrigerating unit.
Background
At present, the energy consumption of refrigeration and air-conditioning equipment occupies a large proportion in the total energy consumption of the building, so that the energy efficiency improvement of the refrigeration and air-conditioning host equipment is particularly important for energy conservation and emission reduction. The screw compressor has simple structure, less wearing parts, low exhaust temperature, insensitivity to large amount of lubricating oil contained in refrigerant and good air transmission quantity regulation, and has been widely applied in the fields of refrigeration, air conditioning, chemical technology and the like.
At present, if a refrigerating device containing a screw compressor is commonly used in large-scale central air conditioner and low-temperature freezing and refrigerating places and runs at high ring temperature for a long time, the temperature of lubricating oil can reach about 120 ℃, and at the moment, the poor lubricating effect even leads to the abrasion of the compressor so as to influence the service life of a unit. For this reason, the prior art performs cooling by providing an oil cooler as shown in fig. 1; however, in this case, the refrigeration devices are in a single-cooling mode, and the energy is difficult to fully utilize.
In view of this, the present utility model has been made.
Disclosure of Invention
The utility model solves the problems that the structure of the existing screw refrigerating unit is unreasonable, the utilization rate is low and the operation stability is poor.
In order to solve the problems, the utility model provides a screw refrigerating unit, which comprises a screw compressor, an oil separator, an evaporative condenser and a shell and tube heat exchanger which are connected, wherein the shell and tube heat exchanger exchanges heat with a refrigerant to convey cold water outwards, and the screw refrigerating unit also comprises a second heat exchanger for exchanging heat and cooling lubricating oil; one side of the second heat exchanger is respectively connected with the oil separator and the screw compressor, the other side of the second heat exchanger is connected with a water tank, and the water tank is used for conveying domestic hot water to a user.
The utility model can transfer the heat of high-temperature lubricating oil into the water of the water tank, so that the screw refrigerating unit can supply hot water to a user while refrigerating, and simultaneously reduce the temperature of the lubricating oil to improve the running stability and reliability of the screw refrigerating unit, and simultaneously realize the full utilization of energy.
Preferably, a water collecting tank is arranged at the bottom of the evaporative condenser, and the second heat exchanger is positioned in the water collecting tank. The device can utilize the condensed water in the water collecting tank to indirectly exchange heat and cool down when the oil temperature of the separated lubricating oil is low, so that the application scene is further enriched, and the user satisfaction is improved.
Preferably, a preheating coil is arranged between the water tank and the second heat exchanger, the preheating coil is positioned in the water collecting tank, and a second pump body is arranged between the preheating coil and the water tank. The setting can utilize the comdenstion water in the water catch bowl to preheat the water in the water tank, further improves the temperature that supplies water to the user through the water tank, and the energy utilization is high, and user's travelling comfort is good.
Preferably, the water tank is provided with a water inlet pipeline and a water outlet pipeline which are communicated with the second heat exchanger, and the preheating coil is positioned on the water inlet pipeline. Preferably, the water tank is connected with a water supplementing system and is used for supplementing water into the water tank.
Because the oil temperature entering the second heat exchanger is higher than the temperature of the condensed water in the evaporative condenser, the water in the water tank firstly enters the preheating coil through the second pump body and exchanges heat with the condensed water to preheat, and then enters the second heat exchanger to exchange heat with lubricating oil in a high-temperature state, so that the energy utilization rate is high; and simultaneously, the heat exchange efficiency of the evaporative condenser is further improved.
Preferably, the screw refrigeration unit further comprises an expansion valve located between the shell and tube heat exchanger and the evaporative condenser. Preferably, the screw refrigerating unit further comprises a gas-liquid separator, and the gas-liquid separator is positioned between the shell-and-tube heat exchanger and the screw compressor. This arrangement provides additional internal volume on the low pressure side of the screw refrigeration unit and temporary storage of excess refrigerant liquid while preventing the excess refrigerant from entering the compressor causing the lubrication oil to be diluted.
Preferably, the screw refrigerating unit further comprises a pressure sensor and a temperature sensor, wherein the pressure sensor is arranged on a connecting pipeline between the oil separator and the evaporative condenser, and the temperature sensor is used for detecting the temperature of lubricating oil in the first pipeline and the second pipeline. The device can measure the high pressure of the screw refrigerating unit, determine the preset temperature of the lubricating oil according to the high pressure, detect whether the oil temperature is obviously reduced according to the preset temperature, and improve the detection accuracy.
Preferably, a first pipeline is arranged between the second heat exchanger and the oil separator, a second pipeline is arranged between the second heat exchanger and the screw compressor, and the first pipeline or the second pipeline is provided with a first pump body for driving lubricating oil to flow. The device has simple structure, less change to the prior device and convenient production and processing.
Preferably, the evaporative condenser further comprises a spray pipe connected with the water collecting tank, a refrigerant pipeline is arranged below the spray pipe, a fan is arranged above the spray pipe, and the refrigerant pipeline is communicated with the connecting pipeline; and a circulating pump is arranged between the spray pipe and the water collecting tank and used for conveying condensed water in the water collecting tank to the spray pipe. Preferably, the fans are multiple, and can be fully or partially started as required.
Preferably, the evaporative condenser further comprises a water baffle plate arranged in an S shape, and the water baffle plate is positioned between the spray pipe and the fan. The arrangement can effectively prevent the circulating water from being carried out by the air flow formed by the fan, and further reduce the water consumption of the evaporative condenser. As an example of the present utility model, the water baffle is plural and arranged at intervals in the horizontal direction.
Compared with the prior art, the screw refrigerating unit has the following beneficial effects: 1) The heat of the lubricating oil is transferred to the domestic water in the water tank through the second heat exchanger, so that the screw refrigerating unit can supply domestic hot water to a user while refrigerating, and meanwhile, the temperature of the lubricating oil is reduced to improve the running stability and reliability of the screw refrigerating unit, and meanwhile, the full utilization of energy is realized; 2) The water tank and condensed water in the evaporative condenser can be subjected to pre-heat exchange by arranging the preset coil, the second pump body is opened according to the requirement, the application scene and mode of the product are enriched, and the user experience is good; 3) Simple structure, little change to current device, the production and processing of being convenient for.
Drawings
FIG. 1 is a schematic diagram of a screw refrigeration unit of the prior art;
FIG. 2 is a schematic view of a screw refrigerating unit according to an embodiment of the present utility model;
fig. 3 is a schematic structural diagram of an evaporative condenser according to an embodiment of the present utility model.
Reference numerals illustrate:
1-a screw compressor; 2-oil separator; 3-evaporative condenser; 31-a fan; 32-spraying pipes; 33-a water collection sump; 34-a water baffle; 35-refrigerant pipeline; 36-a circulation pump; 4-shell-and-tube heat exchangers; a 5-expansion valve; 6-a gas-liquid separator; 7-a pressure sensor; 8-connecting pipelines; 9-a second heat exchanger; 10-a water tank; 11-a first line; 12-a second pipeline; 13-a first pump body; 14-a second pump body; 15-an oil cooler; 16-preheating coil.
Detailed Description
In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. On the premise of no conflict, the technical features in the embodiments of the present utility model may be combined with each other.
The basic working principle of the screw compressor 1 is that a pair of male and female rotors are meshed with each other to perform rotary motion, and the cylinder body surrounding the periphery of the pair of rotors and the sealing covers at the two ends are used for periodically changing the space volume formed by the tooth surface of the rotor and the inner wall surface of the cylinder, so that the sucked gas is compressed to a certain pressure along the axial direction of the rotor and then discharged, and the screw compressor has the advantages of high reliability, strong adaptability, multiphase mixed transportation and the like.
The existing screw refrigerating unit comprises a screw compressor 1, an oil separator 2, an evaporative condenser 3 and a shell-and-tube heat exchanger 4 which are sequentially connected through a connecting pipeline 8, wherein an oil cooler 15 is arranged between the oil separator 2 and the screw compressor 1 and used for conveying lubricating oil to the screw compressor 1 again after cooling down, and the shell-and-tube heat exchanger 4 is used for exchanging heat with a refrigerant to generate cold water. However, at this time, the heat carried by the high-temperature lubricating oil separated by the oil separator 2 cannot be utilized, and even additional energy is required to drive the oil cooler 15 to operate.
In order to fully utilize energy, some manufacturers set heat recovery devices, but the system pressure cannot be regulated according to the external working condition, so that the system reliability is poor; simultaneous studies have found that: the capacity of the compressor is correspondingly reduced by 1-1.5% when the oil temperature is increased by 10 ℃, and the service life of the device is affected when the oil temperature is too high. For this, the applicant proposes the following technical solutions:
as shown in fig. 2, the screw refrigerating unit comprises a screw compressor 1, an oil separator 2, an evaporative condenser 3 and a shell and tube heat exchanger 4 which are connected, wherein the shell and tube heat exchanger 4 is used for exchanging heat with a refrigerant to convey cold water outwards, the screw refrigerating unit further comprises a second heat exchanger 9, one side of the second heat exchanger 9 is respectively connected with the oil separator 2 and the screw compressor 1, and the other side of the second heat exchanger 9 is connected with a water tank 10 and is used for exchanging heat between lubricating oil and water in the water tank 10.
The heat of the high-temperature lubricating oil can be transferred into the water in the water tank 10 through the arrangement of the second heat exchanger 9, so that the screw refrigerating unit can supply hot water to a user while refrigerating, the running stability and reliability of the screw refrigerating unit are improved, and the full utilization of energy is realized. Preferably, the screw refrigeration unit further comprises an expansion valve 5, said expansion valve 5 being located between said shell and tube heat exchanger 4 and the evaporative condenser 3.
Preferably, a water collecting tank 33 is arranged at the bottom of the evaporative condenser 3, and the second heat exchanger 9 is positioned in the water collecting tank 33. This arrangement allows indirect heat exchange cooling by utilizing the condensed water in the water collection tank 33 when the oil temperature of the separated lubricating oil is low.
As an example of the present utility model, a first pipe 11 is provided between the second heat exchanger 9 and the oil separator 2, a second pipe 12 is provided between the second heat exchanger 9 and the screw compressor 1, and the first pipe 11 or the second pipe 12 is provided with a first pump body 13 for driving the flow of lubricating oil. The device has simple structure, less change to the prior device and convenient production and processing.
Preferably, a preheating coil 16 is disposed between the water tank 10 and the second heat exchanger 9, the preheating coil 16 is located in the water collecting tank 33, and a second pump 14 is disposed between the preheating coil 16 and the water tank 10. This arrangement can preheat the water in the water tank 10 by using the condensed water in the water collecting tank 33, further improve the water temperature of the water supplied to the user through the water tank 10, and has high energy utilization rate and excellent user comfort.
As an example of the utility model, the water tank 10 is connected to a water replenishing system, a water inlet pipe and a water outlet pipe are arranged between the water tank 10 and the heat exchanger 9, and the preheating coil 16 is arranged on the water inlet pipe. Because the temperature of the oil entering the second heat exchanger 9 is higher than the temperature of the condensed water in the evaporative condenser 3, the water in the water tank 10 enters the preheating coil 16 through the second pump body 14 and exchanges heat with the condensed water to pre-heat, and then enters the second heat exchanger 9 to exchange heat with the lubricating oil in a high-temperature state, so that the energy utilization rate is high; while the heat exchange efficiency of the evaporative condenser 3 is further improved.
As shown in fig. 3, the evaporative condenser 3 further includes a shower pipe 32 connected to the water collecting tank 33, a refrigerant pipe 35 is disposed below the shower pipe 32, a fan 31 is disposed above the shower pipe 32, and the refrigerant pipe 35 is communicated with the connecting pipe 8; a circulation pump 36 is provided between the shower pipe 32 and the water collection tank 33, and is used for conveying condensed water in the water collection tank 33 to the shower pipe 32.
Preferably, the evaporative condenser 3 further includes a water baffle 34 disposed in an S-shape, and the water baffle 34 is located between the shower pipe 32 and the fan 31, and is used for effectively blocking water from being carried out by the air flow formed by the fan 31, so as to further reduce the water consumption of the evaporative condenser 3. As an example of the present utility model, the water baffle 34 has a plurality of water baffles and is arranged at intervals in the horizontal direction.
Preferably, the screw refrigeration unit further comprises a pressure sensor 7, said pressure sensor 7 being located on a connecting line 35 between said oil separator 2 and the evaporative condenser 3. The device can measure the high pressure of the screw refrigerating unit, determine the corresponding lubricating oil temperature according to the high pressure, and detect whether the oil temperature is obviously reduced according to the high pressure. Preferably, a gas-liquid separator 6 is arranged between the shell-and-tube heat exchanger 4 and the screw compressor 1, which can provide additional internal volume on the low pressure side of the unit and temporarily store excess refrigerant liquid while preventing the excess refrigerant from entering the compressor to cause dilution of the lubricating oil.
The operation process of the screw refrigerating unit comprises the following steps: the high-temperature and high-pressure refrigerant compressed by the screw compressor 1 enters the oil separator 2 to separate the refrigerant from the refrigerating oil, the refrigerant enters the evaporative condenser 3 to exchange heat with water and air and become a high-pressure medium-temperature liquid refrigerant, the refrigerant passes through the expansion valve 5 to become a low-temperature liquid refrigerant and enters the shell-and-tube heat exchanger 4 to exchange heat with water, the generated cold water is output outwards for refrigeration and the like, and the refrigerant returns to the screw compressor 1 to complete one cycle.
The separated high-temperature lubricating oil enters the second heat exchanger 9 through the first pump body 13 to exchange heat with water in the water tank 10 to cool, and the water in the water tank 10 absorbs heat and heats to form domestic hot water which can be supplied to a user; and the cooled lubricating oil returns to the screw compressor 1 through the second pipeline 12 for lubrication, sealing and cooling.
When domestic hot water is not required to be supplied, the second pump body 12 is closed, and the lubricating oil entering the second heat exchanger 9 is cooled by condensed water in the water collecting tank 33, and indirect heat exchange is performed at the moment, so that the cooling effect of the lubricating oil is poor; when the temperature T of the lubricating oil is detected Oil (oil) When the temperature is more than A, wherein A is 70-90 ℃, which indicates that the oil temperature is higher at the moment, all fans 31 of the evaporative condenser 3 are started to run at full load; run t 0 After a period of time, such as 10min, the temperature T of the lubricating oil is again detected Oil (oil) If T Oil (oil) a-B indicates that the temperature drop of the lubricating oil is not obvious, and the second pump body 12 is opened when the domestic water in the water tank 10 needs to be used for cooling. Wherein the value of B is related to the high pressure, and is shown in Table 1.
TABLE 1 preset value B vs. high pressure
Every t 1 Duration detection of temperature T of lubricating oil Oil (oil) When T Oil (oil) When < C, it is indicated that the temperature of the lubricating oil has decreased; or when the temperature of the water used in the water tank 10 is higher than D, which indicates the water temperature in the water tank 10 to meet the living demand, the second pump body 12 is closed.
Although the present utility model is disclosed above, the present utility model is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the utility model, and the scope of the utility model should be assessed accordingly to that of the appended claims.
Claims (10)
1. The screw refrigerating unit comprises a screw compressor (1), an oil separator (2), an evaporative condenser (3) and a shell and tube heat exchanger (4) which are connected, wherein the shell and tube heat exchanger (4) is used for exchanging heat with a refrigerant to convey cold water outwards, and the screw refrigerating unit is characterized by further comprising a second heat exchanger (9) for exchanging heat and cooling lubricating oil; one side of the second heat exchanger (9) is respectively connected with the oil separator (2) and the screw compressor (1), the other side of the second heat exchanger (9) is connected with the water tank (10), and the water tank (10) is used for conveying domestic hot water to a user.
2. Screw refrigeration unit according to claim 1, wherein the bottom of the evaporative condenser (3) is provided with a water collection sump (33), the second heat exchanger (9) being located in the water collection sump (33).
3. Screw refrigeration unit according to claim 2, characterized in that a preheating coil (16) is arranged between the water tank (10) and the second heat exchanger (9), the preheating coil (16) being located in the water collection sump (33), a second pump body (14) being arranged between the preheating coil (16) and the water tank (10).
4. A screw refrigeration unit according to claim 3, wherein the water tank (10) is provided with a water inlet conduit and a water outlet conduit communicating with the second heat exchanger (9), the preheating coil (16) being located on the water inlet conduit.
5. Screw refrigeration unit according to claim 1, further comprising an expansion valve (5), the expansion valve (5) being located between the shell and tube heat exchanger (4) and the evaporative condenser (3).
6. Screw refrigeration unit according to claim 5, further comprising a gas-liquid separator (6), the gas-liquid separator (6) being located between the shell-and-tube heat exchanger (4) and the screw compressor (1).
7. Screw refrigeration unit according to claim 6, further comprising a pressure sensor (7) and a temperature sensor, the pressure sensor (7) being arranged on a connecting line (8) between the oil separator (2) and the evaporative condenser (3), the temperature sensor being arranged to detect the temperature of the lubricating oil in the first line (11), the second line (12).
8. Screw refrigerating unit according to claim 2, characterized in that a first pipeline (11) is arranged between the second heat exchanger (9) and the oil separator (2), a second pipeline (12) is arranged between the second heat exchanger (9) and the screw compressor (1), and the first pipeline (11) or the second pipeline (12) is provided with a first pump body (13) for driving the flow of lubricating oil.
9. Screw refrigerating unit according to claim 2, characterized in that the evaporative condenser (3) further comprises a spray pipe (32) connected with the water collecting tank (33), a refrigerant pipeline (35) is arranged below the spray pipe (32), a fan (31) is arranged above the spray pipe (32), and the refrigerant pipeline (35) is communicated with the connecting pipeline (8); a circulating pump (36) is arranged between the spray pipe (32) and the water collecting tank (33) and is used for conveying condensed water in the water collecting tank (33) to the spray pipe (32).
10. Screw refrigeration unit according to claim 9, wherein the evaporative condenser (3) further comprises a water deflector (34) arranged in an S-shape, the water deflector (34) being located between the shower pipe (32) and the fan (31).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321573328.3U CN220103441U (en) | 2023-06-20 | 2023-06-20 | Screw refrigerating unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321573328.3U CN220103441U (en) | 2023-06-20 | 2023-06-20 | Screw refrigerating unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220103441U true CN220103441U (en) | 2023-11-28 |
Family
ID=88841358
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321573328.3U Active CN220103441U (en) | 2023-06-20 | 2023-06-20 | Screw refrigerating unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220103441U (en) |
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2023
- 2023-06-20 CN CN202321573328.3U patent/CN220103441U/en active Active
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