CN208312791U - A kind of commercial display cases prevent the control system of compressor liquid hammer - Google Patents
A kind of commercial display cases prevent the control system of compressor liquid hammer Download PDFInfo
- Publication number
- CN208312791U CN208312791U CN201820690053.4U CN201820690053U CN208312791U CN 208312791 U CN208312791 U CN 208312791U CN 201820690053 U CN201820690053 U CN 201820690053U CN 208312791 U CN208312791 U CN 208312791U
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- Prior art keywords
- compressor
- temperature sensor
- evaporator
- refrigerant
- controller
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Abstract
The utility model relates to the control systems that a kind of commercial display cases prevent compressor liquid hammer, including compressor, evaporator and controller, it is equipped with inlet temperature sensor at the refrigerant inlet of the evaporator, is equipped with outlet temperature sensor at refrigerant exit, inlet temperature sensor, outlet temperature sensor are electrically connected with the controller respectively, and the controller is electrically connected with alarm.The utility model further relates to the control method that a kind of commercial display cases prevent the control system of compressor liquid hammer.Judge that can the refrigerant in evaporator sufficiently be evaporated by difference comparsion, when the refrigerant in evaporator can not sufficiently be evaporated, controller reduces the operation power of compressor or stops the operation of compressor, and there are liquid hammer risks by alarm equipment alarm compressor, it notifies user maintenance, effectively avoids the appearance of compressor liquid hit phenomenon.
Description
Technical field
The utility model relates to commercial display cases field, specifically a kind of commercial display cases prevent the control system of compressor liquid hammer
And its control method.
Background technique
The one of main cause for leading to compressor fault in commercial display cases industry is exactly compressor liquid hammer.
The main reason for leading to compressor liquid hammer is: 1. refrigerant injection rates are excessive；2. capillary flow rate is excessive or heating power is swollen
Swollen valve opening is excessive；3. secondary addition refrigerant is excessive when user maintains refrigerator；4. evaporimeter frosting ice is stifled serious etc., these
Reason all can cause refrigerant evaporation insufficient.
Compressor is the compression that refrigerant is carried out by valve body, when the refrigerant return without sufficiently evaporating and having liquid to pressure
When contracting machine, incompressible liquid refrigerants can generate powerful impact force to compressor, will when this situation continues
Cause the valve pad of the intracorporal valve block of compressor valve and crankshaft deformation, valve body breakdown, will lead to compressor in this way and be vented
Amount reduces or is unable to the failure of normal exhaust, and the refrigeration system to commercial display cases is made not freeze.
The controller of commercial display cases, which only has, currently on the market controls the excessively high protective program of compressor pressure, to prevent from compressing
Machine burning coil, the control system and control method for causing compressor to be damaged by liquid hammer without controlling vapo(u)rization system degree of superheat deficiency
(not having the hardware facility and protective program for preventing compressor liquid hammer).
Utility model content
The purpose of the utility model is to provide the control systems that a kind of commercial display cases prevent compressor liquid hammer, can
Can the refrigerant in detection evaporator sufficiently be evaporated, and the appearance of compressor liquid hit phenomenon is effectively prevent.
Purpose of the utility model is realized as follows:
A kind of commercial display cases prevent the control system of compressor liquid hammer, including compressor, evaporator and controller, the steaming
It sends out equipped with outlet temperature sensor is equipped at inlet temperature sensor, refrigerant exit at the refrigerant inlet of device, inlet temperature senses
Device, outlet temperature sensor are electrically connected with the controller respectively, and the controller is electrically connected with alarm.
The alarm is alarming horn.
The alarm is attention display.
Above-mentioned commercial display cases prevent the control method of the control system of compressor liquid hammer, it is characterised in that: including following step
It is rapid:
Step 1, controller acquired the temperature number of an inlet temperature sensor, outlet temperature sensor every 3-5 seconds
According to acquisition data adopt one number time for one each time；
Step 2, when the collected temperature value of outlet temperature sensor and the collected temperature value of inlet temperature sensor
When difference is greater than 0.5 degree Celsius, judge that the refrigerant in evaporator can sufficiently be evaporated, controller, which controls compressor, to be continued normally
Work；Be less than when the difference of the collected temperature value of outlet temperature sensor and the collected temperature value of inlet temperature sensor or
When equal to 0.5 degree Celsius, judge that the refrigerant in evaporator can not sufficiently be evaporated, controller reduces the operation function of compressor
Rate；
Step 3 is sensed when adopting the collected temperature value of outlet temperature sensor one number time at continuous two with inlet temperature
When the difference of the collected temperature value of device is respectively less than or is equal to 0.5 degree Celsius, judge that compressor has liquid hammer risk, controller is complete
Stop the operation of compressor, and passes through alarm equipment alarm.
The beneficial effects of the utility model are as follows:
Inlet porting temperature sensor and outlet temperature sensing are distinguished at the refrigerant inlet of evaporator and at refrigerant exit
Device, controller acquire the data of this two sensors, judge that can the refrigerant in evaporator sufficiently be evaporated by difference comparsion,
When the refrigerant in evaporator can not sufficiently be evaporated, controller reduces the operation power of compressor or stops the fortune of compressor
Row, and by alarm equipment alarm compressor, there are liquid hammer risks, notify user maintenance, effectively avoid going out for compressor liquid hit phenomenon
It is existing.
Detailed description of the invention
Fig. 1 is the schematic diagram of the refrigeration system of one commercial display cases of the utility model embodiment.
Fig. 2 is the schematic diagram for the control system that one commercial display cases of the utility model embodiment prevent compressor liquid hammer.
Fig. 3 is the original of the control method for the control system that one commercial display cases of the utility model embodiment prevent compressor liquid hammer
Reason figure.
Specific embodiment
The utility model is further described below with reference to embodiment.
Embodiment one
Referring to Fig. 1-Fig. 2, this commercial display cases prevents the control system of compressor liquid hammer, including compressor 1,4 and of evaporator
Controller 5, compressor 1, condenser 2, expansion valve 3, evaporator 4 constitute the refrigeration system of commercial display cases, in order to avoid compressor
There is liquid hit phenomenon, has carried out the improvement of technical solution, be equipped with inlet temperature at the refrigerant inlet of the evaporator 4 and sense
At device 41, refrigerant exit be equipped with outlet temperature sensor 42, inlet temperature sensor 41, outlet temperature sensor 42 respectively with control
Device 5 processed is electrically connected, and the controller 5 is electrically connected with alarm 6.When control system works, controller 5 acquires inlet temperature sensing
The data of device 41, outlet temperature sensor 42 judge that can the refrigerant in evaporator 4 sufficiently be evaporated by difference comparsion, when
When refrigerant in evaporator 4 can not sufficiently be evaporated, controller 5 reduces the operation power of compressor 1 or stops compressor 1
Operation, and compressor 1 is alarmed there are liquid hammer risk by alarm 6, notice user maintenance effectively avoids 1 liquid hammer of compressor existing
The appearance of elephant
Further, the alarm 6 is one of alarming horn, attention display or two kinds of combination, alarm
Loudspeaker are alarmed by way of the sound, and attention display is alarmed by way of showing fault code, can pass through light, acoustic alarm
Mode notify user maintenance.
We are learnt by practice, when temperature (preferably the returning in 4 connect compressor 1 of evaporator of 4 refrigerant exit of evaporator
Inlet porting temperature sensor 41 at tracheae) than the temperature of 4 refrigerant inlet of evaporator
(outlet temperature sensor 42 preferably is arranged at the evaporation tube about 30mm of capillary connection evaporator 4) is higher by 0.5
It when spending, can determine that the refrigerant in refrigeration system in evaporator 4 is sufficiently evaporated, compressor 1 will be flowed back into without liquid refrigerants
Valve body in.
According to above-mentioned practice, referring to figures 1-3, this commercial display cases prevents the controlling party of the control system of compressor liquid hammer
Method, comprising the following steps:
Step 1, controller 5 is every the inlet temperature sensor 41 of acquisition in 3-5 seconds, the temperature of outlet temperature sensor 42
Degree evidence acquires data each time as one and adopts one number time；
Step 2, when the collected temperature value of outlet temperature sensor 42 and the collected temperature of inlet temperature sensor 41
When the difference of value is greater than 0.5 degree Celsius, judge that the refrigerant in evaporator 4 can sufficiently be evaporated, controller 5 controls compressor 1
Continue to work normally；When the collected temperature value of outlet temperature sensor 42 and the collected temperature value of inlet temperature sensor 41
Difference be less than or equal to 0.5 degree Celsius when, judge that the refrigerant in evaporator 4 can not sufficiently be evaporated, controller 5 reduce pressure
The method of hesitation can be used to reduce its overall operation power, frequency-changeable compressor in the operation power of contracting machine 1, invariable frequency compressor
The method of frequency reducing can be used to reduce its overall operation power；
Step 3 is passed when adopting the collected temperature value of outlet temperature sensor one number time 42 at continuous two with inlet temperature
When the difference of the collected temperature value of sensor 41 is respectively less than or is equal to 0.5 degree Celsius, judge that compressor 1 has liquid hammer risk, controls
Device 5 stops the operation (i.e. power-off shutdown protection) of compressor 1 completely, and is alarmed by alarm 6, notifies user maintenance, effectively
Avoid the appearance of compressor liquid hit phenomenon.
The above-mentioned preferred embodiment for the utility model, has been shown and described the basic principles and main features of the utility model
And the advantages of the utility model.Those skilled in the art should be recognized that the present utility model is not limited to the above embodiments, on
It states and only illustrates the principles of the present invention described in embodiment and specification, do not departing from the spirit and scope of the utility model
Under the premise of the utility model also has various changes and improvements, these changes and improvements both fall within claimed it is practical new
Within the scope of type.The utility model requires protection scope is defined by appended claims and its equivalent.
Claims (3)
1. a kind of commercial display cases prevent the control system of compressor liquid hammer, including compressor (1), evaporator (4) and controller
(5), which is characterized in that be equipped with inlet temperature sensor (41) at the refrigerant inlet of the evaporator (4), be equipped at refrigerant exit
Outlet temperature sensor (42), inlet temperature sensor (41), outlet temperature sensor (42) are electrically connected with controller (5) respectively
It connects, the controller (5) is electrically connected with alarm (6).
2. commercial display cases prevent the control system of compressor liquid hammer according to claim 1, which is characterized in that the alarm
It (6) is alarming horn.
3. commercial display cases prevent the control system of compressor liquid hammer according to claim 1, which is characterized in that the alarm
It (6) is attention display.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820690053.4U CN208312791U (en) | 2018-05-09 | 2018-05-09 | A kind of commercial display cases prevent the control system of compressor liquid hammer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820690053.4U CN208312791U (en) | 2018-05-09 | 2018-05-09 | A kind of commercial display cases prevent the control system of compressor liquid hammer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208312791U true CN208312791U (en) | 2019-01-01 |
Family
ID=64711243
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820690053.4U Expired - Fee Related CN208312791U (en) | 2018-05-09 | 2018-05-09 | A kind of commercial display cases prevent the control system of compressor liquid hammer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208312791U (en) |
-
2018
- 2018-05-09 CN CN201820690053.4U patent/CN208312791U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190101 |
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| CF01 | Termination of patent right due to non-payment of annual fee |