CN107218742A - Heat pump and heat pump control method - Google Patents
Heat pump and heat pump control method Download PDFInfo
- Publication number
- CN107218742A CN107218742A CN201710438489.4A CN201710438489A CN107218742A CN 107218742 A CN107218742 A CN 107218742A CN 201710438489 A CN201710438489 A CN 201710438489A CN 107218742 A CN107218742 A CN 107218742A
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- Prior art keywords
- compressor
- heat pump
- condenser
- time
- break
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- 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.)
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Classifications
-
- 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
- F25B13/00—Compression machines, plants or systems, with reversible cycle
-
- 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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- 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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
- F25B2313/02741—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve
-
- 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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/04—Refrigeration circuit bypassing means
- F25B2400/0401—Refrigeration circuit bypassing means for the compressor
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The present invention discloses a kind of heat pump and heat pump control method.The heat pump includes：Compressor and condenser, the condenser include first flow and second flow channel；The compressor is connected to constitute heat pump circuit with the first flow of the condenser；The outlet of the compressor is connected by the second flow channel of the condenser with the entrance of the compressor.The present invention can be while compressor shutdown; by opening hot gas bypass circuit; the refrigerant in compressor outlet pipeline is set to enter after the second flow channel condensation of condenser; as liquid after gas-liquid separator is mixed with low pressure refrigerant; the entrance of compressor is back to, thus can rapidly realize that high-low pressure is balanced, therefore; can Fast-Balance heat pump refrigeration system high-low pressure so that compressor can quickly start without pressure difference.
Description
Technical field
The present invention relates to air-conditioning technical field, in particular to a kind of heat pump and heat pump control method.
Background technology
In refrigerating and air conditioning industry, hot-gas bypass technology is many times used to defrosting or adjusting evaporating temperature, but in number
On code screw compressor, mainly unloading is acted on hot-gas bypass.In the prior art, most steam compression heat pump/refrigeration
Unit all need not specially carry out the Balance Treatment of high-low pressure when shutting down, and reason is mainly unit when in itself can be by one section
Between shutdown place and reach high-low pressure balance, this is generally that can reach high-low pressure poised state in a few minutes, and compressor is again
Startup with pressure will not start.
But, when some extraordinary heat pump refrigeration equipments are used for thermostatic control, precision equipment requires very high to temperature fluctuation,
It may need to be again started up quickly after not allowing the downtime of compressor clock in a measure, compressor shutdown.At this time, system
High-low pressure is also not reaching to poised state, and pressure difference is than larger, and compressor start is just extremely difficult, often results in the protection of controller
Cause to start and fail.
The common restricting element in this area includes throttle capillary tube, heating power expansion valve and electric expansion valve, and still, these are normal
Rule restricting element is unable to reach the effect of Fast-Balance high-low pressure.Therefore, can on these restricting elements a magnetic valve in parallel
To realize Fast-Balance high-low pressure, but because reversely leakage often occurs in magnetic valve or can not completely close, this can be caused
The reduction of systematic function.For example, after compressor shutdown, the high-low pressure on system pipeline can not pass through (the compression of compressor UNICOM
Machine plays cut-off valve action).Wherein, the pipeline with compressor air suction mouthful UNICOM is low pressure line, with exhaust outlet of compressor UNICOM
Pipeline be pressure duct, on pressure duct refrigerant can only (electric expansion valve, capillary, heating power be swollen by restricting element
Swollen valve etc.) slowly flow on low pressure line, pressure balance is realized with this.Because these restricting element bores are too small, with height
The pressure difference of low pressure is tapered into, and just less and less by the refrigerant flow of restricting element aperture, balancing speed is just slower.
The content of the invention
A kind of heat pump and heat pump control method are provided in the embodiment of the present invention, to solve to be unable to reach in the prior art
The problem of Fast-Balance high-low pressure.
To achieve the above object, the embodiment of the present invention provides a kind of heat pump, including：Compressor and condenser, it is described
Condenser includes first flow and second flow channel；The compressor is connected with the first flow of the condenser to be returned with constituting heat pump
Road；The outlet of the compressor is connected by the second flow channel of the condenser with the entrance of the compressor.
Preferably, the heat pump also includes four-way valve, expansion valve 7, evaporator and gas-liquid separator；The compression
The outlet of machine passes sequentially through the first group interface of the four-way valve, the first flow of the condenser, the expansion valve 7, described
It is connected after evaporator, the second group interface of the four-way valve and the gas-liquid separator with the entrance of the compressor.
Preferably, the second that the pipeline between the outlet of the compressor and the four-way valve passes through the condenser
Road is connected with the entrance of the gas-liquid separator.
Preferably, being set on pipeline between the second flow channel of the condenser and the entrance of the gas-liquid separator
There is magnetic valve.
Preferably, the second flow channel of the condenser is located at the bottommost of the condenser.
Present invention also offers a kind of heat pump control method, including：Above-mentioned heat pump is provided；In compressor shutdown
The hot gas bypass circuit is opened, so that the refrigerant of the outlet output of the compressor flows back to institute by the hot gas bypass circuit
State the entrance of compressor.
Preferably, methods described includes：By opening the solenoid valve control institute being arranged in the hot gas bypass circuit
State the break-make of hot gas bypass circuit.
Preferably, methods described also includes：The time of the break-make is determined according to outdoor environment temperature and defrosting time
Length.
Preferably, the time length for determining the break-make according to outdoor environment temperature and defrosting time includes：Step 11,
Environment temperature at the end of judging the environment temperature at the end of currently defrosting whether less than last time defrosting, if it is, t1=
1.5t0, otherwise, t1=t0, wherein, t1 is the first make-and-break time, and t0 is the time of last time break-make；Step 12, according to t2=
(t4/t3) * t0 calculate the second make-and-break time t2, wherein, t3 is last time defrosting time, and t4 is current defrosting time；Step 13, will
In t1 and t2 big that as current break-make time.
Preferably, also including before step 11：Step 10, persistently heating after defrosting terminates first, control is described
Hot gas bypass circuit opens very first time t.
Preferably, when midway shutdown is started shooting heat again, re-executing step 10 to step 13.
The present invention can make in compressor outlet pipeline while compressor shutdown, by opening hot gas bypass circuit
Refrigerant enters after the second flow channel condensation of condenser, as liquid after gas-liquid separator is mixed with low pressure refrigerant, returns
Flow to the entrance of compressor, thus can rapidly realize that high-low pressure is balanced, therefore, can Fast-Balance heat pump height
Pressure, so that compressor can quickly start without pressure difference.In addition, being unloaded to after HTHP exhaust cooling liquid after shutting down and being
System low pressure line, so as to avoid, high-low pressure impact is excessive, and HTHP is vented impact system low pressure zero when solving unloading
The problem of part.
Brief description of the drawings
Fig. 1 is the structural representation of the embodiment of the present invention.
Description of reference numerals：1st, compressor；2nd, condenser；3rd, four-way valve；4th, evaporator；5th, gas-liquid separator；6th, electromagnetism
Valve；7th, expansion valve.
Embodiment
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings, but not as the limit to the present invention
It is fixed.
Fig. 1 is refer to, the embodiment of the present invention provides a kind of heat pump, including：Compressor 1 and condenser 2, the condensation
Device 2 includes first flow and second flow channel；The compressor 1 is connected with the first flow of the condenser 2 to be returned with constituting heat pump
Road；The outlet of the compressor 1 is connected by the second flow channel of the condenser 2 with the entrance of the compressor 1.The compression
The exporting of machine 1, the second flow channel of the condenser 2, the entrance of the compressor 1 may be constructed a hot gas bypass circuit.
So, when freezing or heating shutdown unloading balance high-low pressure, while compressor 1 is shut down, heat can be opened
Gas bypass circulation, therefore, the refrigerant in the outlet conduit of compressor 1 enter after the second flow channel condensation of condenser 2, as liquid
After gas-liquid separator is mixed with low pressure refrigerant, the entrance of compressor 1 is back to, thus can rapidly realize high-low pressure
Balance, therefore, can Fast-Balance heat pump refrigeration system high-low pressure so that compressor can quickly start without pressure difference.
In addition, system low-voltage pipeline is unloaded to after HTHP exhaust cooling liquid after shutting down, so as to avoid high-low pressure
Impact is excessive, the problem of HTHP is vented impact system low pressure parts when solving unloading.
As illustrated in fig. 1, it is preferred that the heat pump also includes four-way valve 3, expansion valve 7, evaporator 4 and gas-liquid separation
Device 5；The outlet of the compressor 1 passes sequentially through the first group interface, the first flow of the condenser 2, institute of the four-way valve 3
State after expansion valve 7, the evaporator 4, the second group interface of the four-way valve 3 and the gas-liquid separator 5 with the compressor
1 entrance connection.More specifically, the pipeline between the outlet of the compressor 1 and the four-way valve 3 passes through the condenser 2
Second flow channel be connected with the entrance of the gas-liquid separator 5.In order to realize the break-make control to hot gas bypass circuit, preferably
Magnetic valve 6 is provided with ground, the pipeline between the second flow channel of the condenser 2 and the entrance of the gas-liquid separator 5.
It refer to Fig. 1, being exported between the D ends of four-way valve 3 to be connected with of compressor 1 is returned for the hot-gas bypass of unloading
Road, hot gas bypass circuit has four nodes, respectively P, Q, M and N, wherein, pipeline PQ is connected to the bottommost U of condenser 2 pipes
Import Q, the outlet M of the U pipes is connected to the import N of gas-liquid separator 5, an electromagnetism is equipped with PQMN connecting pipe
Valve 6.
Below, the course of work of the heat pump in invention is described in detail with reference to Fig. 1.
When heat pump is in refrigeration mode, the flow path of refrigerant is：DC ends → condensation of compressor → four-way valve
ES ends → gas-liquid separator → compressor of device → expansion valve → evaporator → four-way valve.When refrigeration shuts down unloading balance high-low pressure
When, after compressor 1 is shut down, outer blower fan general time-delay closing opens magnetic valve 6, PQMN pipelines are (i.e. while compressor 1 is shut down
Hot gas bypass circuit) on refrigerant condensation after, mixed as liquid into gas-liquid separator 5 with low pressure refrigerant, quickly reality
Existing high-low pressure balance.
When heat pump is in heating mode, the flow path of refrigerant is：DE ends → evaporation of compressor → four-way valve
CS ends → gas-liquid separator → compressor of device → expansion valve → condenser → four-way valve.Unloading balance high-low pressure is shut down when heating
When, after compressor 1 is shut down, outer blower fan and four-way valve 3 general time-delay closing open magnetic valve 6 while compressor 1 is shut down,
After refrigerant condensation on PQMN pipelines (i.e. hot gas bypass circuit), enter gas-liquid separator 5 and low pressure refrigerant as liquid
Mixing, quickly realizes that high-low pressure is balanced.
Preferably, the second flow channel of the condenser 2 is located at the bottommost of the condenser 2.Now, using condenser
The U-tube of 2 bottommost constitutes the hot gas bypass circuit.When hot gas bypass circuit is arranged on into bottommost, it is more beneficial for
The defrosting ponding under low-temperature heating pattern is avoided to freeze.
Fig. 1 is refer to, present invention also offers a kind of heat pump control method, including：Above-mentioned heat pump is provided, more
Body, the hot gas bypass circuit is opened when compressor 1 is shut down, so that the refrigerant of the outlet output of the compressor 1 passes through
The hot gas bypass circuit flows back to the entrance of the compressor 1.
So, when freezing or heating shutdown unloading balance high-low pressure, while compressor 1 is shut down, heat can be opened
Gas bypass circulation, therefore, the refrigerant in the outlet conduit of compressor 1 enter after the second flow channel condensation of condenser 2, as liquid
After gas-liquid separator is mixed with low pressure refrigerant, the entrance of compressor 1 is back to, thus can rapidly realize high-low pressure
Balance, therefore, can Fast-Balance heat pump refrigeration system high-low pressure so that compressor can quickly start without pressure difference.
In addition, system low-voltage pipeline is unloaded to after HTHP exhaust cooling liquid after shutting down, so as to avoid high-low pressure
Impact is excessive, the problem of HTHP is vented impact system low pressure parts when solving unloading.
In order to prevent condenser bottom conduit defrosting water freezing in low-temperature heating, it is preferable that the present invention is always according to outdoor
Environment temperature and defrosting time determine the time length of the break-make.After defrosting terminates, opens solenoid valve certain time, so that
Ensure that the defrosting water on bottom conduit can be removed thoroughly, tied with preventing the defrosting water of residual from being remained in new heating in the cycle
Ice.
In a preferred embodiment, the time length of the break-make can be determined by following manner, including it is following
Step：
Step 10, persistently heating after defrosting terminates first, controlling the hot gas bypass circuit to open very first time t；
Step 11, the environment temperature at the end of judging the environment temperature at the end of currently defrosting whether less than last time defrosting,
If it is, t1=1.5t0, otherwise, t1=t0, wherein, t1 is the first make-and-break time, and t0 is the time of last time break-make；
Step 12, the second make-and-break time t2 is calculated according to t2=(t4/t3) * t0, wherein, t3 is last time defrosting time, t4
It is current defrosting time；
Step 13, using big that in t1 and t2 as current break-make time.
In the specific implementation, the first make-and-break time and the second make-and-break time can be calculated respectively, then selected again from the two
A larger value is selected as the time of current break-make, to control the opening time length of magnetic valve.If shut down again in midway
When start is heated, step 10 is re-executed to step 13.
By the above-mentioned means, can be returned according to outdoor environment temperature and defrosting feedback of the information situation, comprehensive descision hot-gas bypass
The unlatching control on road, prevents the defrosting water freezing that outdoor heat exchanger bottom is remained during low-temperature heating from causing unit operation to deteriorate.
The present invention can realize the effect of " short circuit " using the magnetic valve 6 set in hot gas bypass circuit：Stop in compressor 1
After machine, by controlling the unlatching of magnetic valve 6 (relative aperture restricting element is much bigger), pressure duct and the system in low pressure line are realized
The quick UNICOM of cryogen, so that the Fast-Balance of high-low pressure is realized, without waiting for the slow balance of restricting element.
Certainly, above is the preferred embodiment of the present invention.It should be pointed out that for those skilled in the art
For, on the premise of its general principles are not departed from, some improvements and modifications can also be made, these improvements and modifications
It is considered as protection scope of the present invention.
Claims (11)
1. a kind of heat pump, it is characterised in that including：Compressor (1) and condenser (2), the condenser (2) include first
Runner and second flow channel；
The compressor (1) is connected to constitute heat pump circuit with the first flow of the condenser (2)；
The outlet of the compressor (1) is connected by the second flow channel of the condenser (2) with the entrance of the compressor (1).
2. heat pump according to claim 1, it is characterised in that the heat pump also includes four-way valve (3), expansion
Valve (7), evaporator (4) and gas-liquid separator (5)；The outlet of the compressor (1) passes sequentially through the first of the four-way valve (3)
Group interface, the first flow of the condenser (2), the expansion valve (7), the evaporator (4), the of the four-way valve (3)
The entrance of two group interfaces and the gas-liquid separator (5) afterwards with the compressor (1) is connected.
3. heat pump according to claim 2, it is characterised in that the outlet of the compressor (1) and the four-way valve
(3) pipeline between is connected by the second flow channel of the condenser (2) with the entrance of the gas-liquid separator (5).
4. heat pump according to claim 3, it is characterised in that the condenser (2) second flow channel with it is described
Magnetic valve (6) is provided with pipeline between the entrance of gas-liquid separator (5).
5. heat pump according to any one of claim 1 to 4, it is characterised in that the second of the condenser (2)
Road is located at the bottommost of the condenser (2).
6. a kind of heat pump control method, it is characterised in that including：
Heat pump any one of claim 1 to 5 is provided；
The hot gas bypass circuit is opened when compressor (1) is shut down, so that the refrigerant warp of the outlet output of the compressor (1)
Cross the entrance that the hot gas bypass circuit flows back to the compressor (1).
7. heat pump control method according to claim 6, it is characterised in that methods described includes：It is arranged on by opening
Magnetic valve (6) in the hot gas bypass circuit controls the break-make of the hot gas bypass circuit.
8. heat pump control method according to claim 7, it is characterised in that methods described also includes：According to outdoor environment
Temperature and defrosting time determine the time length of the break-make.
9. heat pump control method according to claim 8, it is characterised in that true according to outdoor environment temperature and defrosting time
The time length of the fixed break-make includes：
Step 11, the environment temperature at the end of judging the environment temperature at the end of currently defrosting whether less than last time defrosting, if
It is, then t1=1.5t0, otherwise, t1=t0, wherein, t1 is the first make-and-break time, and t0 is the time of last time break-make；
Step 12, the second make-and-break time t2 is calculated according to t2=(t4/t3) * t0, wherein, t3 is last time defrosting time, and t4 is to work as
Preceding defrosting time；
Step 13, using big that in t1 and t2 as current break-make time.
10. heat pump control method according to claim 9, it is characterised in that also include before step 11：
Step 10, persistently heating after defrosting terminates first, controlling the hot gas bypass circuit to open very first time t.
11. heat pump control method according to claim 10, it is characterised in that when shutdown halfway is started shooting and heated again, weight
The new step 10 that performs is to step 13.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710438489.4A CN107218742A (en) | 2017-06-12 | 2017-06-12 | Heat pump and heat pump control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710438489.4A CN107218742A (en) | 2017-06-12 | 2017-06-12 | Heat pump and heat pump control method |
Publications (1)
| Publication Number | Publication Date |
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| CN107218742A true CN107218742A (en) | 2017-09-29 |
Family
ID=59947421
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710438489.4A Pending CN107218742A (en) | 2017-06-12 | 2017-06-12 | Heat pump and heat pump control method |
Country Status (1)
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| CN (1) | CN107218742A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109340919A (en) * | 2018-09-14 | 2019-02-15 | 广东美的制冷设备有限公司 | Air conditioner |
| CN109539660A (en) * | 2018-12-26 | 2019-03-29 | 荆州市楚泰新能源科技有限公司 | A kind of double power mode pure electric vehicle freezing and refrigeration units |
| CN109737634A (en) * | 2019-02-22 | 2019-05-10 | 广东海悟科技有限公司 | A kind of non-stop-machine heat pump air conditioning system of low temperature and its control method |
| CN112611072A (en) * | 2020-11-30 | 2021-04-06 | 青岛海尔空调电子有限公司 | Control method of cooling and heating air conditioner |
| CN113418329A (en) * | 2021-05-28 | 2021-09-21 | 青岛海尔空调电子有限公司 | Control method of refrigeration and freezing unit and refrigeration and freezing unit |
| CN113606739A (en) * | 2021-08-20 | 2021-11-05 | 宁波奥克斯电气股份有限公司 | Control method and device for air conditioner shutdown differential pressure balance and multi-split air conditioner |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109340919A (en) * | 2018-09-14 | 2019-02-15 | 广东美的制冷设备有限公司 | Air conditioner |
| CN109539660A (en) * | 2018-12-26 | 2019-03-29 | 荆州市楚泰新能源科技有限公司 | A kind of double power mode pure electric vehicle freezing and refrigeration units |
| CN109737634A (en) * | 2019-02-22 | 2019-05-10 | 广东海悟科技有限公司 | A kind of non-stop-machine heat pump air conditioning system of low temperature and its control method |
| CN112611072A (en) * | 2020-11-30 | 2021-04-06 | 青岛海尔空调电子有限公司 | Control method of cooling and heating air conditioner |
| CN113418329A (en) * | 2021-05-28 | 2021-09-21 | 青岛海尔空调电子有限公司 | Control method of refrigeration and freezing unit and refrigeration and freezing unit |
| CN113606739A (en) * | 2021-08-20 | 2021-11-05 | 宁波奥克斯电气股份有限公司 | Control method and device for air conditioner shutdown differential pressure balance and multi-split air conditioner |
| CN113606739B (en) * | 2021-08-20 | 2022-08-12 | 宁波奥克斯电气股份有限公司 | Control method and device for air conditioner shutdown differential pressure balance and multi-split air conditioner |
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