CN211575424U - Control device for wide working condition operation - Google Patents
Control device for wide working condition operation Download PDFInfo
- Publication number
- CN211575424U CN211575424U CN202020036344.9U CN202020036344U CN211575424U CN 211575424 U CN211575424 U CN 211575424U CN 202020036344 U CN202020036344 U CN 202020036344U CN 211575424 U CN211575424 U CN 211575424U
- Authority
- CN
- China
- Prior art keywords
- condenser
- evaporimeter
- tube side
- pressure
- evaporator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Air Conditioning Control Device (AREA)
Abstract
The utility model discloses a controlling means of wide operating mode operation, including the condenser, the evaporimeter, electronic expansion valve, screw compressor, the condenser passes through screw compressor and is connected with the evaporimeter, be connected with electronic expansion valve between evaporimeter and the condenser, the evaporimeter includes evaporimeter tube side and the evaporimeter barrel of parcel outside the evaporimeter tube side, the condenser includes condenser tube side and the condenser barrel of parcel outside the condenser tube side, all be equipped with temperature sensor on evaporimeter tube side and the condenser tube side, all be equipped with pressure transmitter on evaporimeter barrel and the condenser barrel, temperature sensor and pressure transmitter are connected with a controller, the controller is connected with electronic expansion valve. The utility model discloses an installation temperature sensor and pressure transmitter come detecting system temperature and operating pressure on condenser and evaporimeter barrel, and the controller is according to the opening of detection data control electronic expansion valve.
Description
Technical Field
The utility model relates to an air conditioner refrigerating system field, in particular to controlling means of wide operating mode operation.
Background
In the screw compression refrigeration system of the air conditioner, when the compressor operates, because the screw compressor supplies oil by pressure difference, pressure difference is needed between high pressure and low pressure, so that the lubricating oil can be supplied to the bearing by the unit through the pressure difference to normally operate, and the normal loading, unloading and the like of the unit are also completed by pushing the slide valve forward through oil pressure, so that the unit normally rotates. However, conventional units have a working condition range of operating water temperature, when the temperature of water at the condenser side of the refrigeration unit is low and the water at the evaporator side is high, or under other water temperature conditions, the difference between the high-side pressure and the low-side pressure of the compressor is lower than the water temperature of 4bar, the compressor is not supplied with oil smoothly, the energy regulating system fails, the lubrication is insufficient, and the compressor is seriously damaged.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: the control device for wide-working-condition operation is provided, and the pressure transmitter and the temperature sensor are additionally arranged to detect the operation pressure and water temperature data of the system, so that the opening degree of the electronic expansion valve is adjusted.
The utility model provides a technical scheme that above-mentioned problem adopted does: the utility model provides a controlling means of wide operating mode operation, includes condenser, evaporimeter, electronic expansion valve, screw compressor, the condenser passes through screw compressor and is connected with the evaporimeter, be connected with electronic expansion valve between evaporimeter and the condenser, the evaporimeter includes evaporimeter tube side and the evaporimeter barrel of parcel outside the evaporimeter tube side, the condenser includes condenser tube side and the condenser barrel of parcel outside the condenser tube side, all be equipped with temperature sensor on evaporimeter tube side and the condenser tube side, all be equipped with pressure transmitter on evaporimeter barrel and the condenser barrel, temperature sensor and pressure transmitter are connected with a controller, the controller is connected with electronic expansion valve.
Compared with the prior art, the utility model has the advantages of: on the basis of the original unit pressure maintaining valve, a control device for detecting the operating pressure of a system by installing a pressure transmitter on a condenser and an evaporator cylinder is added, the water temperature data of a water inlet and a water outlet of the unit is detected by a temperature sensor of the water inlet and the water outlet of the unit, the pressure which can be detected in real time according to the unit is provided, and the opening degree of an electronic expansion valve of the unit is adjusted by the temperature data, so that the pressure of the high pressure side and the low pressure side of the system is adjusted, the pressure difference required by the normal operation of the unit is ensured, and the normal operation of the unit under various water temperature working.
Preferably, the evaporator tube side is provided with an evaporator water inlet and an evaporator water outlet, the evaporator water inlet is provided with a third temperature sensor, and the evaporator water outlet is provided with a fourth temperature sensor. Therefore, the temperature sensor can detect the temperature of the water inlet, the temperature of the water outlet and other information of the condenser, and the temperature condition of the condenser can be conveniently counted.
Preferably, the condenser tube side is provided with a condenser water inlet and a condenser water outlet, the condenser water inlet is provided with a first temperature sensor, and the condenser water outlet is provided with a second temperature sensor. Therefore, information such as the temperature of the water inlet and the temperature of the water outlet of the evaporator can be detected through the temperature sensor, and the temperature condition of the evaporator can be conveniently counted.
Preferably, the evaporator cylinder is provided with a low-pressure transmitter, and the condenser cylinder is provided with a high-pressure transmitter. Therefore, the high-pressure value on the condenser side and the low-pressure value on the evaporator side can be detected through the pressure transmitter, and later statistics is facilitated.
Preferably, a pressure maintaining valve is connected between the condenser and the screw compressor. Thus, the pressure difference between both sides can be maintained by the pressure maintaining valve.
Preferably, be equipped with evaporimeter air inlet and evaporimeter liquid outlet on the evaporimeter barrel, be equipped with condenser air inlet and condenser liquid outlet on the condenser barrel, the condenser air inlet is connected with pressure maintenance valve one end, the pressure maintenance valve other end is connected with screw compressor one end, the evaporimeter air inlet is connected with the screw compressor other end, the evaporimeter liquid outlet is connected with electronic expansion valve one side, the condenser liquid outlet is connected with the electronic expansion valve opposite side.
Drawings
FIG. 1 is a schematic view of the overall structure of a control device operating under wide operating conditions;
FIG. 2 is a schematic diagram of a control circuit of the control device of the present invention;
fig. 3 is a schematic view of the structure of the condenser of the present invention.
The reference numbers in the figures illustrate: 1. the condenser comprises a condenser body 11, a condenser tube side 111, a condenser water inlet 112, a condenser water outlet 12, a condenser cylinder body 121, a high-pressure transmitter 122, a condenser air inlet 123, a condenser liquid outlet 2, a screw compressor 3, an evaporator 311, an evaporator water inlet 312, an evaporator water outlet 321, a low-pressure transmitter 322, an evaporator air inlet 323, an evaporator liquid outlet 4, an electronic expansion valve 5 and a pressure maintaining valve.
Detailed Description
Embodiments of the present invention are further described below with reference to the accompanying drawings.
As shown in fig. 1 to 3, the present embodiment relates to a control device for wide-range operation, which includes a condenser 1, a screw compressor 2, an evaporator 3, and an electronic expansion valve 4. The condenser 1 is connected with an evaporator 3 through a screw compressor 2, and an electronic expansion valve 4 is connected between the evaporator 3 and the condenser 1.
The evaporator 3 comprises an evaporator tube side and an evaporator cylinder wrapped outside the evaporator tube side, and the condenser 1 comprises a condenser tube side 11 and a condenser cylinder 12 wrapped outside the condenser tube side 11. Temperature sensors are arranged on the evaporator tube side and the condenser tube side 11.
Specifically, the condenser tube side 11 is provided with a condenser water inlet 111 and a condenser water outlet 112, the condenser water inlet 111 is provided with a first temperature sensor, and the temperature of the condenser water inlet measured by the first temperature sensor is T1. And a second temperature sensor is arranged on the water outlet 112 of the condenser, and the temperature of the water outlet of the condenser measured by the second temperature sensor is T2.
The evaporator tube side is provided with an evaporator water inlet 311 and an evaporator water outlet 312, the evaporator water inlet 311 is provided with a third temperature sensor, and the temperature of the evaporator water inlet measured by the third temperature sensor is T3. And a fourth temperature sensor is arranged on the water outlet 312 of the evaporator, and the temperature of the water outlet of the evaporator measured by the fourth temperature sensor is T4.
Wherein, pressure transmitters are arranged on the evaporator cylinder and the condenser cylinder 12. Specifically, the low pressure transmitter 321 is arranged on the evaporator cylinder, and the low pressure transmitter 321 measures the system low pressure on the evaporator to be P2. The condenser cylinder 12 is provided with a high-pressure transmitter 121, and the high-pressure transmitter 121 detects that the system high-pressure value of the condenser III is P1.
In this embodiment, the temperature sensor and the pressure transmitter are connected to a controller, and the controller is connected to the electronic expansion valve 4. The controller analyzes the information transmitted by the temperature sensor and the pressure transmitter, and then the opening degree of the electronic expansion valve is adjusted.
In actual use, a pressure maintaining valve 5 is connected between the condenser 1 and the screw compressor 2.
An evaporator air inlet 322 and an evaporator liquid outlet 323 are arranged on the evaporator barrel, a condenser air inlet 122 and a condenser liquid outlet 123 are arranged on the condenser barrel 12, the condenser air inlet 122 is connected with one end of a pressure maintaining valve 5, the other end of the pressure maintaining valve 5 is connected with one end of a screw compressor 2, the evaporator air inlet 322 is connected with the other end of the screw compressor 2, the evaporator liquid outlet 323 is connected with one side of an electronic expansion valve 4, and the condenser liquid outlet 123 is connected with the other side of the electronic expansion valve 4.
In this embodiment, after the start command is executed to the refrigeration unit, the unit enters a start process, and the temperature data T1, T12, T3 and T4 collected by the temperature sensors are in units of ℃. The pressure data P1, P2 collected by the pressure transmitter, in bar, are transmitted to the group controller for processing. Wherein, there are setting parameters in the controller:
A1-Low pressure protection value (in bar);
a2 high-low pressure difference protection value (unit bar);
a3-lowest operating water temperature value (unit ℃) of the condenser;
a4-highest running water temperature (unit ℃) of the evaporator, and A3 is more than A4;
a5-superheat setting;
a 6-temperature conversion value corresponding to refrigerant saturation pressure (according to the low pressure P2 collected by the low pressure transmitter of the system, the saturation temperature value A6 corresponding to the refrigerant pressure is obtained through the internal conversion of the controller).
In this embodiment, the normal control program method is as follows:
when T4-A6 is greater than A5+1, the controller controls the opening of the electronic expansion valve to increase;
when A5+1 is more than or equal to T4-A6 is more than or equal to A5-1, the opening of the electronic expansion valve is controlled by the controller to be kept unchanged;
when T4-A6 < A5-1, the controller controls the opening of the electronic expansion valve to be reduced.
The special control program method is as follows:
when P1-P2 > A2, the controller calls the normal program;
when the P1-P2 is not more than A2, the controller outputs and adjusts the opening degree of the expansion valve for closing the expansion valve, so that the value of P2 (low pressure) of the unit is reduced, the value of P1 (high pressure) is increased, when the value of P2 (low pressure) is less than A1, the electronic expansion valve stops closing the opening degree and reversely opens the opening degree, when the value of P2 (low pressure) is not less than A1+0.5bar, the adjustment is stopped, and the value of P2 (low pressure) for normal operation of the unit is more than A1.
In this way, the expansion valve is actually closed to reduce the pressure of the low-pressure side of the compressor, the pressure of the high-pressure side of the compressor is increased, the difference between the high pressure and the low pressure is increased, and low-pressure protection cannot occur.
In this embodiment, after the unit is started to operate, when the pressure on the discharge side of the compressor and the pressure on the suction side of the compressor of the system are less than 4bar, the pressure maintaining valve is not opened, the unit continues to operate, and the high pressure continuously rises. Only when the pressure difference between the air discharge side pressure of the compressor and the air suction side pressure of the compressor of the system is more than 4bar, the pressure maintaining valve is opened, and the discharged air enters the condenser for circulation, so that the establishment of the lowest pressure difference of the unit is effectively ensured.
For example, the following steps are carried out: after the pressure maintaining valve is opened, the control device can adjust the opening example of the electronic expansion valve according to the collected water temperature and pressure data: setting a 1-3 bar, a 2-5 bar, A3-16 ℃, a 4-25 ℃, a5-1 ℃,
when T1 is more than or equal to A3 and T3 is less than or equal to A4, the unit calls a normal control program,
when T1 is more than or equal to A3 and T3 is more than A4, the unit calls a special control program,
when T1 is less than A3 and T3 is more than A4, the unit calls a special control program,
when T1 < A3 and T3 < A4, the unit calls a special control program.
The utility model has the advantages that: on the basis of the original unit pressure maintaining valve, a control device for detecting the operating pressure of a system by installing a pressure transmitter on a condenser and an evaporator cylinder is added, the water temperature data of a water inlet and a water outlet of the unit is detected by a temperature sensor of the water inlet and the water outlet of the unit, the pressure which can be detected in real time according to the unit is provided, and the opening degree of an electronic expansion valve of the unit is adjusted by the temperature data, so that the pressure of the high pressure side and the low pressure side of the system is adjusted, the pressure difference required by the normal operation of the unit is ensured, and the normal operation of the unit under various water temperature working.
While the foregoing description shows and describes several preferred embodiments of the invention, it is to be understood, as noted above, that the invention is not limited to the forms disclosed herein, but is not intended to be exhaustive or to exclude other embodiments and may be used in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. But that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention, which is to be limited only by the claims appended hereto.
Claims (6)
1. The utility model provides a controlling means of wide operating mode operation, includes condenser (1), helical-lobe compressor (2), evaporimeter (3) and electronic expansion valve (4), condenser (1) is connected with evaporimeter (3) through helical-lobe compressor (2), be connected with electronic expansion valve (4), its characterized in that between evaporimeter (3) and condenser (1): evaporimeter (3) include evaporimeter tube side and the evaporimeter barrel of parcel outside the evaporimeter tube side, condenser (1) include condenser tube side (11) and parcel condenser barrel (12) outside condenser tube side (11), all be equipped with temperature sensor on evaporimeter tube side and the condenser tube side (11), all be equipped with pressure transmitter on evaporimeter barrel and condenser barrel (12), temperature sensor and pressure transmitter are connected with a controller, the controller is connected with electronic expansion valve (4).
2. The control device for the wide-operating-condition operation according to claim 1, characterized in that: condenser tube side (11) are equipped with condenser water inlet (111) and condenser delivery port (112), be equipped with first temperature sensor on condenser water inlet (111), be equipped with second temperature sensor on condenser delivery port (112).
3. The control device for wide-range operation according to claim 1 or 2, wherein: the evaporator is characterized in that the evaporator tube side is provided with an evaporator water inlet (311) and an evaporator water outlet (312), a third temperature sensor is arranged on the evaporator water inlet (311), and a fourth temperature sensor is arranged on the evaporator water outlet (312).
4. The control device for the wide-range operation according to claim 3, wherein: the evaporator cylinder is provided with a low-pressure transmitter (321), and the condenser cylinder (12) is provided with a high-pressure transmitter (121).
5. The control device for the wide-operating-condition operation according to claim 1, characterized in that: and a pressure maintaining valve (5) is also connected between the condenser (1) and the screw compressor (2).
6. The control device for the wide-operating-condition operation according to claim 5, characterized in that: be equipped with evaporimeter air inlet (322) and evaporimeter liquid outlet (323) on the evaporimeter barrel, be equipped with condenser air inlet (122) and condenser liquid outlet (123) on condenser barrel (12), condenser air inlet (122) are connected with pressure maintenance valve (5) one end, the pressure maintenance valve (5) other end is connected with screw compressor (2) one end, evaporimeter air inlet (322) are connected with screw compressor (2) other end, evaporimeter liquid outlet (323) are connected with electronic expansion valve (4) one side, condenser liquid outlet (123) are connected with electronic expansion valve (4) opposite side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020036344.9U CN211575424U (en) | 2020-01-08 | 2020-01-08 | Control device for wide working condition operation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020036344.9U CN211575424U (en) | 2020-01-08 | 2020-01-08 | Control device for wide working condition operation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211575424U true CN211575424U (en) | 2020-09-25 |
Family
ID=72555350
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020036344.9U Active CN211575424U (en) | 2020-01-08 | 2020-01-08 | Control device for wide working condition operation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211575424U (en) |
-
2020
- 2020-01-08 CN CN202020036344.9U patent/CN211575424U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6568197B2 (en) | Refrigerating unit | |
| US8191377B2 (en) | Heat source apparatus and method of starting the apparatus | |
| US6619062B1 (en) | Scroll compressor and air conditioner | |
| US6041605A (en) | Compressor protection | |
| US6599093B2 (en) | Compressor having speed and intake regulation valve control | |
| US6287083B1 (en) | Compressed air production facility | |
| CN112393482B (en) | Variable-frequency air-cooled water chilling unit and variable-working-condition starting control method thereof | |
| EP2015004B1 (en) | Air conditioner | |
| EP1134518A3 (en) | Method for controlling an electronic expansion valve based on cooler pinch and discharge superheat | |
| JPH05187728A (en) | Method and device for controlling head pressure of air-conditioning or refrigeration system | |
| CN109506315A (en) | A kind of air conditioner and the control method for preventing compressor from running with liquid | |
| CN107965937B (en) | A kind of refrigeration unit and its evacuate halt control method | |
| EP1106830A3 (en) | Control valve in variable displacement compressor | |
| WO2021078033A1 (en) | Method for controlling heating belt of compressor | |
| CN101563572A (en) | Suction modulation valve for refrigerant system with adjustable opening for pulse width modulation control | |
| US20070172370A1 (en) | Capacity control device and capacity control method for screw compressor | |
| CN211575424U (en) | Control device for wide working condition operation | |
| CN111981719B (en) | Refrigerating unit compression refrigeration cycle control method and device and refrigerating unit | |
| CN112249057B (en) | Operation control method for refrigeration mode of subway air conditioner at low temperature | |
| KR100556771B1 (en) | Room temperature control method for air conditioner equipped with multi compressor | |
| JP2000054977A (en) | Intermediate-stage pressure control method for screw compressor | |
| US11104204B2 (en) | Method for operating a coolant circuit for a vehicle air-conditioning system | |
| CN106440443B (en) | Air conditioning system suitable for high-temperature refrigeration and control method | |
| US20010032471A1 (en) | Variable displacement compressor with capacity control device | |
| CN112944614A (en) | Control method of air conditioner and air conditioner |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |