CN108679882A - A kind of low-temperature air source heat pump Gas-supplying enthalpy-increasing system - Google Patents
A kind of low-temperature air source heat pump Gas-supplying enthalpy-increasing system Download PDFInfo
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- CN108679882A CN108679882A CN201810482757.7A CN201810482757A CN108679882A CN 108679882 A CN108679882 A CN 108679882A CN 201810482757 A CN201810482757 A CN 201810482757A CN 108679882 A CN108679882 A CN 108679882A
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- heat pump
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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
- F25B30/00—Heat pumps
- F25B30/06—Heat pumps characterised by the source of low potential heat
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
Abstract
The invention discloses a kind of low-temperature air source heat pump Gas-supplying enthalpy-increasing systems, including compressor, condenser, the first access for water conservancy diversion refrigerant, alternate path, third path and the refrigerant supercooling apparatus that can be vaporized the refrigerant, the refrigerant supercooling apparatus is connected with first access and the alternate path respectively, part of refrigerant in first access flows into the compressor, another part refrigerant is flowed into the third path, some refrigerant is flowed into the alternate path, the third path is equipped with the cut-off device that can control the third path break-make；When outside air temperature is relatively low or leaving water temperature is higher causes delivery temperature higher, press gas supplementing opening that can spray into sufficient amount liquid refrigerant to reduce rapidly delivery temperature in compressor, it prevents the excessively high deformation of compressor scroll plate central temperature and lubricating oil from being deteriorated because of high temperature rotten, ensures the service life of complete machine.
Description
Technical field
The invention belongs to heat pump system field of mechanical technique, more particularly, to a kind of low-temperature air source heat pump Gas-supplying enthalpy-increasing system
System.
Background technology
Currently, utilization of the low-temperature air source heat pump unit in northern centralized heating system coal changes electricity transformation project is more next
More extensive, pressure ratio is excessive when being run in order to avoid low temperature environment, excessive discharge temperature, while increasing effective enthalpy of system, into
One step improves unit heat efficiency, compressor generally use Gas-supplying enthalpy-increasing technology.Existing low-temperature air source heat pump Gas-supplying enthalpy-increasing skill
Art be difficult take into account variable parameter operation heat efficiency and compressor reliability, if in order to control with the economizer bypass side outlet degree of superheat
Target, then delivery temperature is very high when outdoor temperature is relatively low, reduces the reliability of compressor；And if with delivery temperature mesh in order to control
Mark, if when delivery temperature control targe value is higher, outside air temperature is higher or heat supply water temperature is relatively low, Gas-supplying enthalpy-increasing systematic economy device
Closing is caused refrigerant main road highly pressurised liquid degree of supercooling to reduce and unit heating capacity, heat efficiency decaying by refrigerant bypass.Together
When, when delivery temperature control targe value is relatively low, then pressure gas supplementing opening is easy to spray into liquid refrigerant and dilute compressor in compressor
Whirlpool disk freezing oil film and the lubrication and sealing performance for influencing whirlpool disk, it is final to influence compressor operating reliability.
Invention content
For overcome the deficiencies in the prior art, provide one kind ensuring compressor normal operation, extends complete machine use the present invention
The low-temperature air source heat pump Gas-supplying enthalpy-increasing system in service life.
To achieve the goals above, the present invention uses following technical scheme：A kind of low-temperature air source heat pump Gas-supplying enthalpy-increasing system
System, including compressor, condenser, the first access, alternate path and third path for water conservancy diversion refrigerant, first access
Inlet is connected with the condenser, alternate path outlet and the third path export respectively with the compressor
Gas supplementing opening is connected；At first lane exit respectively with the alternate path entrance, the third path entrance and described
Compressor is connected, and the low-temperature air source heat pump Gas-supplying enthalpy-increasing system further includes that the refrigerant supercooling that can be vaporized the refrigerant is set
Standby, the refrigerant supercooling apparatus is connected with first access and the alternate path respectively, one in the first access
Refrigerant is divided to flow into the compressor, another part refrigerant is flowed into the third path, some refrigerant
It is flowed into the alternate path；The refrigerant in the alternate path is flowed by refrigerant supercooling apparatus to described first
Refrigerant in access carried out cold treatment, and the refrigerant in alternate path vaporizes under the effect of refrigerant supercooling apparatus；It is described
Third path is equipped with the cut-off device that can control the third path break-make, when delivery temperature is higher than preset value in compressor
When, the cut-off device conducting；By detecting the operations such as outside air temperature, leaving water temperature, compressor exhaust temperature, high low pressure ginseng
Number takes the refrigerant condition and air compensation that throttling set adjusts pressure gas supplementing opening in compressor, in turn to Gas-supplying enthalpy-increasing system
Reach and improve low-temperature air source heat pump heat efficiency and compressor operating reliability purpose, when outside air temperature is higher, leaving water temperature
Compressor low pressure is higher when relatively low or high pressure is relatively low, and delivery temperature is typically in normal operation range, and throttling set is closed at this time,
It is arranged by refrigerant supercooling apparatus, under the premise of implementing effectively supercooling to economized refrigerant main road highly pressurised liquid, it can be ensured that
There is no liquid refrigerant to enter in compressor to press gas supplementing opening and dilute compressor whirlpool disk freezing oil film and influence whirlpool disk lubrication, sealing
Performance, to effectively improve compressor operating efficiency and reliability；Lead to compressor when outside air temperature is relatively low, leaving water temperature is higher
Low pressure is relatively low or high pressure is higher, and especially the first lane exit of compressor start stage highly pressurised liquid not yet forms supercooling, therefore heating power
The refrigerant flow of expansion valve is smaller, and compressor exhaust temperature is higher at this time.When delivery temperature allows operation high close to compressor
In limited time, throttling set open, directly in compressor press gas supplementing opening carry out hydrojet, one side refrigerant can to compression chamber rapidly into
Row effective temperature-reducing is cooled down to reduce delivery temperature, on the other hand since compression chamber internal gas refrigerant temperature at this time is higher, institute
Spraying into liquid refrigerant will evaporate rapidly, will not dilute for lubricating the freezing oil film with hermetic compressor whirlpool disk, therefore can be effective
Improve low-temperature air source heat pump heat efficiency and compressor operating reliability.
Preferably, the refrigerant supercooling apparatus includes economizer and the expansion valve on the alternate path；It is logical
The cooperation for crossing economizer and expansion valve makes refrigerant cross the refrigerant for making to enter while cold treatment in compressor gas supplementing opening
Vaporization avoids that liquid refrigerant is caused to be injected into compressor gas supplementing opening, the lubrication of whirlpool disk is influenced after the freezing oil film of dilution whirlpool disk
And sealing performance, so as to shorten its service life.
Preferably, being equipped with solenoid valve and check valve between the alternate path and the gas supplementing opening of the compressor；Electromagnetism
Valve and check valve can optionally one be configured, also can both have also both without when compressor shutdown or delivery temperature
Close to when allowing lower bound, solenoid valve power-off closes Gas-supplying enthalpy-increasing function, liquid refrigerant is avoided to continue into compressor tonifying Qi
Mouth influence compressor service life；Check valve, which is arranged, prevents gas backflow in compressor gas supplementing opening, in compressor exhaust temperature
When excessively high, liquid refrigerant can be made preferably to enter in compressor gas supplementing opening by check valve and compression chamber internal gas is carried out
Fast-refrigerating promotes the reliability that compressor uses.
Preferably, cut-off device import or export end is equipped with throttle solenoid valve；It needs to cut off throttling set circulation
Throttle solenoid valve powers off when ability, needs, to pressing tonifying Qi mouth spray liquid time manifold solenoid valve to be powered in compressor, to pass through the electromagnetism that throttles
The setting of valve mitigates cut-off device burden, increases the reliability of cut-off device, cut-off device is enable preferably to block refrigerant
Circulation in third path.
Preferably, the expansion valve is heating power expansion valve or electric expansion valve；Economizer refrigeration is controlled by expansion valve
Agent bypass outlet superheat degree, under the premise of implementing effectively supercooling to the first access highly pressurised liquid, it can be ensured that do not have liquid refrigerant
Compressor whirlpool disk freezing oil film is diluted into pressure gas supplementing opening in compressor and influences whirlpool disk lubrication, sealing performance, to effectively
Improve compressor operating efficiency and reliability.
Preferably, the cut-off device includes loading plate, the screwed pipe on the loading plate, is arranged in described hold
In support plate and with the flow-stopping plate screwed pipe matched threaded rod and be movably connected on the loading plate；Loading plate is to disconnected
Stream device in other component play carrying, enable other component be mounted on loading plate on formation one entirety, threaded rod and
Screwed pipe is cooperated by screw thread, can be moved up and down along screwed pipe in threaded rod；Flow-stopping plate is used in cut-off device
Barrier effect from when closing, prevents liquid refrigerant from being entered in compressor gas supplementing opening out of third path.
Preferably, the threaded rod upper end is equipped with driving motor, the driving motor both sides are equipped with guide runner, described
Screwed pipe both sides are equipped with and the matched directive slide track of the guide runner；Driving motor drives threaded rod rotation, threaded rod to exist
Threaded rod is set up to be moved along screwed pipe by the mutual cooperation with screwed pipe during rotation, directive slide track is to threaded rod
It play the guiding role, guide runner plays position-limiting action by the cooperation with directive slide track, to motor, prevents motor in driving threaded rod
Itself rotates when rotation, and threaded rod is enable smoothly to realize up and down motion by rotating.
Preferably, the threaded rod bottom is equipped with block, the loading plate is recessed equipped with being matched with the limited block
Slot, the groove side are equipped with latch components, and the groove other side is equipped with the movable component of controllable flow-stopping plate folding；Block
For stopping that flow-stopping plate turns down, support force is provided for flow-stopping plate, when cut-off device is closed, flow-stopping plate blocks in third path
Liquid chiller makes liquid refrigerant that can not circulate in third channel, and block resists flow-stopping plate, keeps flow-stopping plate better
Blocking effect is played, the reliability that equipment uses is increased；When cut-off device is opened, flow-stopping plate is opened under the effect of movable component
Open, flow-stopping plate be fixed on open position by latch components, third path is made to open, enable liquid refrigerant rapidly into
Enter to compressor gas supplementing opening and cools down to compression chamber.
Preferably, the latch components include the limiting slot being set on the loading plate and on the flow-stopping plate with
The matched limited block of limiting slot；By the cooperation of limiting slot and limited block, flow-stopping plate is made to be fixed on bearing plate, makes gear
Flowing plate is in the open state, no longer plays barrier effect to liquid refrigerant, realizes the on off operating mode of third path.
Preferably, the movable component includes the movable chamber being set in the loading plate, in the movable chamber
Resetting spring and the motion bar on the flow-stopping plate；When the temperature is excessively high, driving motor drives threaded rod to turn in compression chamber
It is dynamic, so that threaded rod is increased along screwed pipe, threaded rod loses the support to flow-stopping plate in rising backstop, and flow-stopping plate is resetting bullet
It is turned down around tie point under the action of spring, motion bar is entered along movable cavity wall inside movable chamber, so that flow-stopping plate is in and is beaten
Open state enables liquid refrigerant to enter directly into and is quickly cooled down to compression chamber in compressor gas supplementing opening；Movable chamber can
It is set as arc, motion bar play the guiding role for resetting spring, and resetting spring one end is fixed on movable chamber end, and the other end is fixed on
Motion bar top makes flow-stopping plate that can be opened rapidly after the support for losing block by the setting of movable component, restores third
The circulation status of access.
The present invention has the following advantages：When delivery temperature is relatively low or in normal range (NR), mended into being pressed in compressor
The refrigerant of gas port has certain degree of superheat, to ensure compressor safe operation, avoids that liquid refrigerant is caused to be injected into compression
It presses gas supplementing opening in machine, the lubrication and sealing performance of whirlpool disk is influenced after the freezing oil film of dilution whirlpool disk, so as to shorten its service life,
Meanwhile when outside air temperature is relatively low or leaving water temperature is higher cause delivery temperature higher when, pressure gas supplementing opening can spray into foot in compressor
Enough quantity of fluid refrigerants to reduce rapidly delivery temperature, prevent the excessively high deformation of compressor scroll plate central temperature and lubricating oil because
High temperature and deteriorate rotten, ensure the service life of complete machine.
Description of the drawings
Fig. 1 is the refrigeration system flow diagram of the embodiment of the present invention 1.
Fig. 2 is cut-off device structural representation of the present invention.
Fig. 3 is enlarged drawing at A in Fig. 2.
Fig. 4 is enlarged drawing at B in Fig. 2.
Fig. 5 is screwed pipe side view of the present invention.
Fig. 6 is the refrigeration system flow diagram of the embodiment of the present invention 2.
Specific implementation mode
In order to make those skilled in the art be better understood from the present invention program, below in conjunction in the embodiment of the present invention
Attached drawing, technical solution in the embodiment of the present invention carry out clear, complete description, it is clear that described embodiment is only
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
The every other embodiment that member is obtained without making creative work should all belong to the model that the present invention protects
It encloses.
Embodiment 1：As shown in Figure 1, a kind of low-temperature air source heat pump Gas-supplying enthalpy-increasing system, including compressor, condenser, use
In the first access 7, alternate path 8 and the third path 9 of water conservancy diversion refrigerant, 7 inlet of the first access and the condenser
It is connected, the outlet of the alternate path 8 and the outlet of the third path 9 are connected with the gas supplementing opening of the compressor respectively；Institute
7 exit of the first access is stated respectively to be connected with 8 entrance of the alternate path, 9 entrance of the third path and the compressor,
The low-temperature air source heat pump Gas-supplying enthalpy-increasing system further includes the refrigerant supercooling apparatus that can be vaporized the refrigerant, the refrigerant
Supercooling apparatus is connected with first access 7 and the alternate path 8 respectively, the part of refrigerant stream in the first access 7
Enter in the compressor, another part refrigerant is flowed into the third path 9, some refrigerant is flowed into described
In alternate path 8；The refrigerant in the alternate path 8 is flowed by refrigerant supercooling apparatus in first access 7
Refrigerant carried out cold treatment, the refrigerant in alternate path 8 refrigerant supercooling apparatus effect under vaporize；The third is logical
Road 9 is equipped with the cut-off device 5 that can control 9 break-make of the third path, when delivery temperature is higher than preset value in compressor, institute
The conducting of cut-off device 5 is stated, so that liquid refrigerant is entered compressor gas supplementing opening to being cooled down in compression chamber, reduces rapidly compression
The temperature of intracavitary.
The refrigerant supercooling apparatus includes economizer 1 and the expansion valve 2 on the alternate path 8；Pass through economy
The cooperation of device 1 and expansion valve 2 makes refrigerant cross the refrigerant vapour for making to enter while cold treatment in compressor gas supplementing opening
Change, avoid causing liquid refrigerant from being injected into compressor gas supplementing opening, influenced after the freezing oil film of dilution whirlpool disk whirlpool disk lubrication and
Sealing performance, so as to shorten its service life；The expansion valve 2 is heating power expansion valve or electric expansion valve, takes expansion valve 2
It is controlled with the combined type of throttling set 3 to adjust the refrigerant condition and air compensation of pressing gas supplementing opening in compressor, and then reaches and carry
High/low temperature air source heat pump heat efficiency and compressor operating reliability purpose；When using electric expansion valve, passed through by detecting
The refrigerant temperature that the 1 refrigerant bypass of device that helps exports, adjusts electronic expansion valve opening, it is ensured that 1 refrigerant bypass of economizer exports
Middle compression refrigerant be in overheated gas state, have certain degree of superheat.
Solenoid valve 4 and check valve 3 are equipped between the alternate path 8 and the gas supplementing opening of the compressor；Solenoid valve 4 and list
To valve 3 can optionally one be configured, also can both have also both without when compressor shutdown or delivery temperature are close to permitting
Perhaps when lower bound, solenoid valve 4 powers off, and closes Gas-supplying enthalpy-increasing function, liquid refrigerant is avoided to continue into compressor gas supplementing opening shadow
Ring compressor service life；Check valve 3, which is arranged, prevents gas backflow in compressor gas supplementing opening, excessively high in compressor exhaust temperature
When, liquid refrigerant can be made preferably to enter in compressor gas supplementing opening by check valve 3 and compression chamber internal gas is carried out soon
Speed refrigeration promotes the reliability that compressor uses.
The Gas-supplying enthalpy-increasing method and control technology by detect outside air temperature, leaving water temperature, compressor exhaust temperature, height/
The operating parameters such as low pressure, and the combined type control of heating power expansion valve 2 and cut-off device 5 is taken to Gas-supplying enthalpy-increasing system to adjust
The refrigerant condition and air compensation of gas supplementing opening are pressed in compressor, and then are reached and improved low-temperature air source heat pump heat efficiency and compression
Machine operational reliability purpose.
When outside air temperature is higher, leaving water temperature is relatively low, compressor low pressure is higher or high pressure is relatively low, and delivery temperature is generally located
In normal operation range, the closing of cut-off device 5,1 refrigerant bypass outlet superheat of economizer is controlled by expansion valve 2 at this time
Degree, under the premise of implementing effectively supercooling to 1 refrigerant main road highly pressurised liquid of economizer, it can be ensured that no liquid refrigerant enters pressure
Gas supplementing opening is pressed in contracting machine and influences the lubrication of compressor whirlpool disk oil film, air-proof condition, effectively improves compressor operating efficiency and can
By property.
Lead to that compressor low pressure is relatively low or high pressure is higher when outside air temperature is relatively low, leaving water temperature is higher, especially compressor opens
When the 1 refrigerant main road outlet of dynamic stage economizer there is no to form enough supercoolings, compressor exhaust temperature is higher.When delivery temperature connects
Nearly compressor allows operation height to prescribe a time limit, and cut-off device 5 is opened, and directly to pressing gas supplementing opening to carry out hydrojet in compressor, on the one hand may be used
Effective temperature-reducing cooling is carried out rapidly to compression chamber refrigerant to reduce delivery temperature, on the other hand due to compression chamber internal gas system
Refrigerant temperature is higher, and sprayed into liquid refrigerant will evaporate rapidly, will not dilute compressor whirlpool disk lubrication and sealing oil film, therefore can
Effectively improve low-temperature air source heat pump heat efficiency and compressor operating reliability.
As shown in Figure 2-5, the cut-off device 5 includes loading plate 53, the screwed pipe 51 on the loading plate 53, wears
In the loading plate 53 and with 51 matched threaded rod 52 of the screwed pipe and be movably connected on the loading plate 53
Flow-stopping plate 55, the flexible connection can be hinged, and flow-stopping plate 55 can be rotated around hinge joint, loading plate 53 to cutout fill
The other component set in 5 plays carrying, enable other component be mounted on loading plate 53 on formed an entirety, threaded rod 52 with
Screwed pipe 51 is cooperated by screw thread, can be moved up and down along screwed pipe 51 in threaded rod 52；Flow-stopping plate 55 is used for
Barrier effect from when cut-off device 3 is closed, prevents liquid refrigerant from being entered in compressor gas supplementing opening out of third path 9.
52 upper end of the threaded rod is equipped with driving motor 521,521 output shaft of driving motor and 52 Joint of threaded rod, institute
It states 521 both sides of driving motor and is equipped with guide runner 522,51 both sides of the screwed pipe are equipped with and are matched with the guide runner 522
Directive slide track 512, the top of screwed pipe 51 is equipped with head cover 511, sealed screwed pipe 51 by head cover 511, will driving electricity
Machine 521 is installed in screwed pipe 51, is shielded to driving motor 521, and extraneous factor is avoided to cause shadow to driving motor 521
It rings；Fixed plate 531 is additionally provided on loading plate 53, threaded rod 52 is arranged in fixed plate 531, and fixed function is played to threaded rod 52,
Screwed pipe 51 is fixedly connected in fixed plate 531；Driving motor 521 drives threaded rod 52 to rotate, mistake of the threaded rod 52 in rotation
Threaded rod 52 is set up to be moved along screwed pipe 51 by the mutual cooperation with screwed pipe 51 in journey, directive slide track 512 gives screw thread
Bar 52 play the guiding role, and guide runner 522 plays position-limiting action by the cooperation with directive slide track 512, to driving motor 521, prevents
Only driving motor 521 itself rotates when driving threaded rod 52 to rotate, and threaded rod 52 is enable smoothly to exist by rotation
It realizes and moves up and down in screwed pipe 51.
52 bottom of the threaded rod is equipped with block 523, and the loading plate 53 is equipped with matches groove with the block 523
535,535 side of the groove is equipped with latch components, and the groove other side is equipped with the movable component of controllable flow-stopping plate folding；
Block 523 provides support force for stopping that flow-stopping plate 55 turns down, for flow-stopping plate 55, and when cut-off device 5 is closed, flow-stopping plate 55 hinders
Liquid chiller in disconnected third path 9, makes liquid refrigerant that can not circulate in third channel, block 523 resists flow-stopping plate
55, so that flow-stopping plate 55 is preferably played blocking effect, increases the reliability that equipment uses；When cut-off device 5 is opened, gear
Flowing plate 55 is opened under the effect of movable component, and flow-stopping plate 55 is fixed on open position by latch components, keeps third logical
Road 9 is opened, and so that liquid refrigerant is quickly entered compressor gas supplementing opening and is cooled down to compression chamber.
The movable component includes the movable chamber 533 being set in the loading plate 53, answering in the movable chamber 533
The position spring 534 and motion bar 552 on the flow-stopping plate 55, movable chamber 533 are arcuate structure, 552 shape of motion bar with
552 Internal periphery of movable chamber is corresponding, and movable chamber 553 is set as arcuate structure, and flow-stopping plate 55 is made to be turned down around hinge joint in fold
When can smoothly turn down, do not limited by motion bar 552；534 one end of resetting spring is connected with 533 end of movable chamber, the other end
It is connected with 552 top of motion bar, 552 bottom end of motion bar is connected with flow-stopping plate 55；Make when flow-stopping plate 55 plays closure to third path 9
Used time, resetting spring 534 are in tensional state, and block 523 resists flow-stopping plate 55, and flow-stopping plate 55 is made to close third path 9；Work as pressure
When contracting built-in temperature is excessively high, driving motor 521 drives threaded rod 52 to rise, and block 523 disappears to the support force of flow-stopping plate 55, gear
Flowing plate 55 turns down under the action of 534 elastic force of resetting spring, so that 55 one end of flow-stopping plate is flipped up and completes to coordinate with latch components,
55 one end of flow-stopping plate is fixed by latch components, flow-stopping plate 55 is made to be in open state, third path 9 is made to be connected.
The latch components include being set to the limiting slot 532 on the loading plate 53 and being set on the flow-stopping plate 55 and institute
532 matched limited block 551 of limiting slot is stated, for the fitness for reinforcing between limited block 551 and limiting slot 532, in limiting slot
Bottom plate made of a magnetic material is arranged in 532 bottom surfaces, and setting one is magnetic at the position that limited block 551 and limiting slot 532 coordinate
Partition board made of material, when cut-off device 5 in the open state, flow-stopping plate 55 turns down under the effect of movable component, makes
Three-way 9 circulates, and the limited block 551 of 55 one end of flow-stopping plate flipped up cooperates with limiting slot 532, by bottom plate and every
Plate magnetic force attracts each other, and keeps the cooperation between limited block 551 and limiting slot 532 more firm, makes limited block 551 in limiting slot
Card jail in 532 promotes the stability that flow-stopping plate 55 works.
When delivery temperature allows operation height to prescribe a time limit close to compressor, signal passes to cut-off device 5, and driving motor 521 drives
Dynamic threaded rod 52 rotates, and the rotation in screwed pipe 51 of threaded rod 52 by the screw-thread fit of threaded rod 52 and screwed pipe 51, makes spiral shell
Rasp bar 52 moves up in screwed pipe 51, and for threaded rod 52 in uphill process, the support effect of flow-stopping plate 55 drops in block 523
Low, until threaded rod 52 rises in groove 535, block 523 loses support effect, work of the flow-stopping plate 55 in elastic force to flow-stopping plate 55
It is turned down around tie point under, third path 9 is made to open, limited block 551 and carrying of the flow-stopping plate 55 in fold rear end
Limiting slot 532 on plate 53 cooperates, and makes the card jail in limiting slot 532 of limited block 551, ensures the unimpeded of third channel；When
After delivery temperature is normal, driving motor 521 drives threaded rod 52 to rotate backward, and makes the rotation in screwed pipe 51 of threaded rod 52, suitable
The decline of screwed pipe 51, the threaded rod 52 of decline arrives to flow-stopping plate 55, oppresses flow-stopping plate 55 downwards, makes flow-stopping plate 55 around connection
Point is turned over downwards, and is made the fold of flow-stopping plate 55 that will be sealed inside third path 9 to vertical state, is played baffle, prevent liquid system
Cryogen continues into compressor inlet.
Embodiment 2：As shown in fig. 6, on the basis of embodiment 1, cut-off device 5 cannot completely cut through refrigerant circulation,
Throttle solenoid valve 6 can be connected at 5 import or export end of cut-off device when necessary, need to cut off the 5 negotiability time of cut-off device
Manifold solenoid valve 6 powers off, and throttle solenoid valve 6 when to compressor gas supplementing opening hydrojet is needed to be powered；When delivery temperature permits close to compressor
Perhaps operation height is prescribed a time limit, and cut-off device 5 and throttle solenoid valve 6 are opened, directly to pressing gas supplementing opening to carry out hydrojet in compressor, on the one hand
Refrigerant can carry out compression chamber rapidly effective temperature-reducing cooling to reduce delivery temperature, on the other hand due to inside compression chamber at this time
Gas refrigerant temperature is higher, and sprayed into liquid refrigerant will evaporate rapidly, will not dilute compressor whirlpool disk lubrication and Seal Oil
Film, therefore low-temperature air source heat pump heat efficiency and compressor operating reliability can be effectively improved.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (10)
1. a kind of low-temperature air source heat pump Gas-supplying enthalpy-increasing system, including compressor, condenser, for the first logical of water conservancy diversion refrigerant
Road（7）, alternate path（8）And third path（9）, first access（7）Inlet is connected with the condenser, and described
Two accesses（8）Outlet and the third path（9）Outlet is connected with the gas supplementing opening of the compressor respectively；First access
（7）Exit respectively with the alternate path（8）Entrance, the third path（9）Entrance and the compressor are connected, special
Sign is：The low-temperature air source heat pump Gas-supplying enthalpy-increasing system further includes the refrigerant supercooling apparatus that can be vaporized the refrigerant, institute
State refrigerant supercooling apparatus respectively with first access（7）With the alternate path（8）It is connected, the first access（7）Interior
Part of refrigerant flows into the compressor, and another part refrigerant is flowed into the third path（9）It is interior, some
Refrigerant is flowed into the alternate path（8）It is interior；It is flowed into the alternate path（8）Interior refrigerant is set by refrigerant supercooling
For to first access（7）Interior refrigerant carried out cold treatment, alternate path（8）Interior refrigerant is set in refrigerant supercooling
The lower vaporization of standby effect；The third path（9）It is equipped with and can control the third path（9）The cut-off device of break-make（5）, work as pressure
When delivery temperature is higher than preset value in contracting machine, the cut-off device（5）Conducting.
2. a kind of low-temperature air source heat pump Gas-supplying enthalpy-increasing system described in accordance with the claim 1, it is characterised in that：The refrigerant
Supercooling apparatus includes economizer（1）With set on the alternate path（8）On expansion valve（2）.
3. a kind of low-temperature air source heat pump Gas-supplying enthalpy-increasing system described in accordance with the claim 1, it is characterised in that：Described second is logical
Road（8）Solenoid valve is equipped between the gas supplementing opening of the compressor（4）And check valve（3）.
4. a kind of low-temperature air source heat pump Gas-supplying enthalpy-increasing system described in accordance with the claim 1, it is characterised in that：The cutout dress
It sets（5）Import or export end is equipped with throttle solenoid valve（6）.
5. a kind of low-temperature air source heat pump Gas-supplying enthalpy-increasing system according to claim 2, it is characterised in that：The expansion valve
（2）For heating power expansion valve or electric expansion valve.
6. a kind of low-temperature air source heat pump Gas-supplying enthalpy-increasing system described in accordance with the claim 1, it is characterised in that：The cutout dress
It sets（5）Including loading plate（53）, be set to the loading plate（53）On screwed pipe（51）, be arranged in the loading plate（53）It is interior and
With the screwed pipe（51）Matched threaded rod（52）And it is movably connected on the loading plate（53）On flow-stopping plate（55）.
7. a kind of low-temperature air source heat pump Gas-supplying enthalpy-increasing system according to claim 6, it is characterised in that：The threaded rod
（52）Upper end is equipped with driving motor（521）, the driving motor（521）Both sides are equipped with guide runner（522）, the screwed pipe
（51）Both sides are equipped with and the guide runner（522）Matched directive slide track（512）.
8. a kind of low-temperature air source heat pump Gas-supplying enthalpy-increasing system according to claim 6, it is characterised in that：The threaded rod
（52）Bottom is equipped with block（523）, the loading plate（53）It is equipped with and the block（523）Match groove（535）, described
Groove（535）Side is equipped with latch components, and the groove other side is equipped with the movable component of controllable flow-stopping plate folding.
9. a kind of low-temperature air source heat pump Gas-supplying enthalpy-increasing system according to claim 8, it is characterised in that：The lock group
Part includes being set to the loading plate（53）On limiting slot（532）With set on the flow-stopping plate（55）The upper and limiting slot
（532）Matched limited block（551）.
10. a kind of low-temperature air source heat pump Gas-supplying enthalpy-increasing system according to claim 9, it is characterised in that：The activity
Component includes being set to the loading plate（53）Interior movable chamber（533）, be set to the movable chamber（533）Interior resetting spring
（534）And it is set to the flow-stopping plate（55）On motion bar（552）.
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