CN113048673A - Infusion pump type refrigerator and refrigeration method - Google Patents
Infusion pump type refrigerator and refrigeration method Download PDFInfo
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- CN113048673A CN113048673A CN202110402940.3A CN202110402940A CN113048673A CN 113048673 A CN113048673 A CN 113048673A CN 202110402940 A CN202110402940 A CN 202110402940A CN 113048673 A CN113048673 A CN 113048673A
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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
- F25B23/00—Machines, plants or systems, with a single mode of operation not covered by groups F25B1/00 - F25B21/00, e.g. using selective radiation effect
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Abstract
The invention relates to a transfusion pump type refrigerator and a refrigeration method thereof, which is characterized in that the refrigerator comprises an evaporator, a steam return pipe, a condenser, a transfusion pipe and a transfusion pump; one end of the infusion tube is hermetically communicated with the bottom of the evaporator, the other end of the infusion tube is hermetically communicated with the bottom of the condenser, and the infusion pump is hermetically connected in series to the infusion tube; one end of the steam return pipe is communicated with the top of the evaporator in a sealing way, and the other end of the steam return pipe is communicated with the top of the condenser in a sealing way; the communicated inner cavities of the evaporator, the steam return pipe, the condenser, the infusion pipe and the infusion pump are vacuumized, and the refrigeration medium is injected into the vacuum communicated inner cavities of the evaporator, the steam return pipe, the condenser, the infusion pipe and the infusion pump, so that the liquid level of the refrigeration medium is higher than that of the infusion pump, and the liquid level of the refrigeration medium in the condenser is still higher than that of the infusion pump when the refrigerator operates. The infusion pump drives a refrigeration medium to flow in the circulation loop, and a refrigeration cycle process of evaporation heat absorption, steam pressure reduction backflow, condensation heat release and liquid booster pumping is realized. The method has the advantages of high medium conveying efficiency, low energy consumption, large refrigeration coefficient and the like.
Description
Technical Field
The invention relates to the technical field of refrigeration and heat supply heat pumps, in particular to a liquid delivery pump type refrigerator and a refrigeration method.
Background
The water absorbs heat and evaporates, and can be cooled. In a common water curtain cooling method, fan air passes through a water curtain or a water curtain at normal temperature, and the heat absorption of water is evaporated, so that the temperature of the fan air can be reduced by 5-8 ℃; here, the flow of air, promotes the endothermic vaporization of water, thereby lowering the air temperature.
As shown in fig. 1, the compression type refrigerating apparatus mainly includes an evaporator, a condenser, a compressor, a connecting pipe, and a capillary tube. The evaporator absorbs heat for refrigeration, and the refrigeration medium absorbs heat for evaporation into vapor; the compressor compresses the steam into high-pressure steam and transmits the high-pressure steam to the condenser; the high-pressure steam is released heat in the condenser and condensed into liquid; the liquid medium is decompressed by the capillary tube and returns to the evaporator, and the next refrigeration cycle process of evaporation-heat absorption-condensation-heat release is started. The compression type refrigerating device has the advantages that the pressure difference between the high-pressure steam and the low-pressure steam of the refrigerating medium is large, namely, the pressure difference between the outlet and the inlet of the compressor is large, the energy consumption of the compressor is large, and compared with an absorption type refrigerating device, the refrigerating efficiency of the compression type refrigerating device is low. Vapor compressors, on the other hand, also have lower media delivery efficiency than liquid delivery pumps.
The compression type refrigerating device changes the flow direction of a compressor and a refrigerating medium, and can be generally used as a heat supply heat pump.
The absorption refrigeration device is shown in fig. 2 and mainly comprises an evaporator, an absorber, a generator, a condenser, an infusion pump, a heat exchanger, a connecting pipe and common refrigeration medium water. The absorption solution in the absorber, such as lithium bromide solution, absorbs the saturated water vapor generated by the evaporator and generates water-lithium bromide diluted solution, the infusion pump drives the circulation flow of the solution, and the generator needs a heat source to heat and separate pure water and the lithium bromide solution. The pressure difference between the evaporator and the absorber is small, the pressure difference of the whole circulation loop is also small, the driving pressure difference required by the infusion pump is small, and the energy consumption of the infusion pump is low; and the liquid pump drive is more efficient in transport than the gas compressor drive. Although the generator needs a heat source for heating, the total refrigerating efficiency of the whole refrigerating device is higher, and can reach more than 80 percent, so the generator is the first choice of a large-scale refrigerating air conditioner.
The absorption refrigerating device changes the flow direction of the infusion pump and the refrigerating medium, and can also be used as a heat supply heat pump.
In the absorption type refrigerating device, the vacuum degree of the inner cavity of the device is high, and the steam transmission resistance between the evaporator and the absorber is small; the absorption solution of the absorber efficiently absorbs the saturated water vapor generated by the evaporator, meanwhile, under the driving action of the infusion pump, the pressure in the cavity of the evaporator is greater than the pressure in the cavity of the absorber, the transportation speed of the water vapor from the evaporator to the absorber is high, and therefore the heat transfer speed is high. Compared with a water curtain cooling method and an absorption type refrigerating device, the absorption type refrigerating device is characterized in that under the condition of high vacuum, an evaporator is a boiling vaporization heat absorption process, an absorber is a saturated steam condensation heat release process, the heat absorption and heat release speed is high, and the temperature difference is small. Comparing fig. 2 with fig. 1, it can be seen that, since an absorption solution is required, in the absorption type refrigerating apparatus, an absorber, a generator, and a heat exchanger are increased, and the generator also needs a heating source.
In the high vacuum pipeline of the heat pipe, the running speed and the heat transfer quantity of steam are very large, the steam pressure Pe in the heat absorption evaporation end cavity of the heat pipe is higher than the steam pressure Pc in the heat release condensation end cavity, and the steam flows from the high-temperature heat absorption end to the low-temperature heat release end.
Disclosure of Invention
The invention aims to provide an infusion pump type refrigerator and a refrigeration method, wherein an infusion pump drives a refrigeration medium to circularly flow, so that the refrigeration efficiency can be improved, the energy consumption is reduced, and the structure of the device is simplified.
In order to achieve the above purpose, the technical scheme of the infusion pump type refrigerator is realized in such a way, and the infusion pump type refrigerator is characterized in that the refrigerator comprises an evaporator, a steam return pipe, a condenser, an infusion pipe and an infusion pump; one end of the infusion tube is hermetically communicated with the bottom of the evaporator, the other end of the infusion tube is hermetically communicated with the bottom of the condenser, and the infusion pump is hermetically connected in series to the infusion tube; one end of the steam return pipe is communicated with the top of the evaporator in a sealing way, and the other end of the steam return pipe is communicated with the top of the condenser in a sealing way; and circulating a refrigerating medium in the heat exchanger in the evaporator, and circulating a radiating medium in the heat exchanger in the condenser.
The communicated inner cavities of the evaporator, the steam return pipe, the condenser, the infusion pipe and the infusion pump are vacuumized, and the refrigeration medium is injected into the vacuum communicated inner cavities of the evaporator, the steam return pipe, the condenser, the infusion pipe and the infusion pump, so that the liquid level of the refrigeration medium is higher than that of the infusion pump, and the liquid level of the refrigeration medium in the condenser is still higher than that of the infusion pump when the refrigerator operates.
In the technical scheme, the condenser is arranged at a position lower than the evaporator by the height H; and the height H is the height difference that the liquid level of the refrigerating medium of the condenser is lower than that of the refrigerating medium of the evaporator when the refrigerating machine operates.
In the technical scheme, a gas storage tank communicated with the steam return pipe is arranged at the highest position of the steam return pipe, and a vacuumizing pipe opening, a vacuum valve or a liquid injection opening can be arranged on the gas storage tank.
In the technical scheme, a throttle valve is also connected in series on the infusion tube.
In the technical scheme, the refrigerating method of the infusion pump type refrigerator comprises the following steps:
the pumping pressure LP of the infusion pump is larger than the difference between the temperature saturation vapor pressure V (tc) of the refrigerating medium tc in the condenser and the temperature saturation vapor pressure V (te) of the refrigerating medium te in the evaporator, wherein LP is larger than V (tc) -V (te); the liquid conveying pump pumps the refrigeration medium of the condenser into the evaporator, so that the liquid level of the refrigeration medium of the evaporator is higher than the liquid level H of the refrigeration medium of the condenser, and the liquid level is rho gH = V (tc) -V (te), rho is the specific gravity of the refrigeration medium liquid, and g is the gravity acceleration; the refrigeration medium in the evaporator absorbs the heat Q of the circulating secondary refrigerant to evaporate and vaporize, so that the temperature of the secondary refrigerant is reduced; under the drive of the pump pressure LP of the infusion pump, medium steam generated by the evaporator flows back to the condenser through the steam return pipe, the refrigeration medium condensed into liquid is released in the condenser, and the heat release D of the steam condensation is taken away by the circulating heat-releasing medium; realizing the refrigeration cycle process of heat absorption, evaporation, heat release and condensation; the vapor pressure at the liquid level of the refrigeration medium of the evaporator is Pe, the vapor pressure at the liquid level of the refrigeration medium of the condenser is Pc, and the friction resistance pressure drop of the vapor of the refrigeration medium flowing from the evaporator to the condenser is Pe-Pc; and further increasing the pump pressure LP of the infusion pump, pumping out and pumping in the increased refrigerating medium, increasing the steam flow and finally increasing the refrigerating capacity Q.
In the technical scheme, the medium flow direction of the infusion pump is changed into a direction, and the refrigerating machine is changed into a heat transfer heat pump for supplying heat to the circulating secondary refrigerant by a circulating heat radiating medium.
In the technical scheme, a throttle valve is connected in series in the steam return pipe, and the optimal filling amount of the refrigeration medium is 85-99%.
In the technical scheme, the refrigerating method of the infusion pump type refrigerator comprises the following steps:
the pumping pressure LP of the infusion pump is larger than the difference between the temperature saturation vapor pressure V (tc) of the refrigerating medium tc in the condenser and the temperature saturation vapor pressure V (te) of the refrigerating medium te in the evaporator, wherein LP is larger than V (tc) -V (te); the liquid pump pumps the refrigerating medium liquid of the condenser into the evaporator; the refrigeration medium in the evaporator absorbs the heat Q of the circulating refrigerating medium to evaporate and vaporize, so that the temperature of the refrigerating medium is reduced; under the drive of the pump pressure LP of the infusion pump, the refrigerant medium steam generated by the evaporator flows back to the condenser through the steam return pipe and the throttle valve, the refrigerant medium condensed into liquid is released in the condenser, and the heat release D of the steam condensation is taken away by the circulating flow heat dissipation medium; realizing the refrigeration cycle process of heat absorption, evaporation, heat release and condensation; further increasing the pumping pressure LP of the infusion pump, pumping out and pumping in the increased refrigerating medium, increasing the steam flow, and finally increasing the refrigerating capacity Q;
the throttling valve plays a role in throttling the flow of the refrigeration medium steam, reduces the pressure of the high-pressure refrigeration medium steam, controls the flow of the refrigeration medium steam flowing into the condenser, and has throttling pressure difference delta JP = V (t) at two ends of the throttling valvec)-V(te) And LP-Delta JP is the pipe wall friction resistance pressure drop of the flowing of the refrigeration medium steam and the refrigeration medium liquid.
Compared with a compression type refrigerating machine, the infusion pump type refrigerating machine has the advantages of high medium conveying efficiency, low energy consumption, large refrigeration coefficient and the like.
Compared with an absorption refrigerator, the infusion pump type refrigerator has the advantages of simple structure, low cost, no need of a refrigeration heat source and the like.
Drawings
FIG. 1 is a schematic diagram of a compression refrigerator of the prior art;
FIG. 2 is a schematic diagram of a prior art absorption chiller;
FIG. 3 is a schematic structural view of the present invention;
FIG. 4 is a schematic diagram of the construction of the refrigerator of the present invention with the condenser below the evaporator H;
FIG. 5 is a schematic diagram of the throttle-added refrigerator of FIG. 4 according to the present invention;
fig. 6 is a schematic diagram of the structure of the refrigerator with throttle valves in series in the return pipe of the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 3, the present invention is an infusion pump type refrigerator, which includes an evaporator 1, a return pipe 2, a condenser 3, an infusion pipe 4 and an infusion pump 5; one end of the infusion tube 4 is hermetically communicated with the bottom of the evaporator 1, the other end of the infusion tube 4 is hermetically communicated with the bottom of the condenser 3, and the infusion pump 5 is hermetically connected in series on the infusion tube 4; one end of the steam return pipe 2 is hermetically communicated with the top of the evaporator 1, and the other end of the steam return pipe 2 is hermetically communicated with the top of the condenser 3; a coolant circulates through the heat exchanger in the evaporator 1, and a heat radiation medium circulates through the heat exchanger in the condenser 3.
The communicated inner cavities of the evaporator 1, the steam return pipe 2, the condenser 3, the infusion pipe 4 and the infusion pump 5 are vacuumized, and a refrigeration medium is injected into the vacuum communicated inner cavities of the evaporator 1, the steam return pipe 2, the condenser 3, the infusion pipe 4 and the infusion pump 5, so that the liquid level of the refrigeration medium is higher than that of the infusion pump 5, and the liquid level of the refrigeration medium in the condenser 3 is still higher than that of the infusion pump 5 when the refrigerator operates.
As shown in fig. 4, the condenser 3 is placed at a lower height H than the evaporator 1; the height H is a height difference that the liquid level of the refrigerant in the condenser 3 is lower than that of the refrigerant in the evaporator 1 when the refrigerator is operated.
As shown in fig. 4 and 5, an air storage tank 6 communicated with the steam return pipe 2 is arranged at the highest position of the steam return pipe 2, and a vacuumizing pipe opening, a vacuum valve or a liquid injection opening can be arranged on the air storage tank 6.
As shown in fig. 5, a throttle valve 7 is connected in series to the infusion tube 4.
The refrigerating method of the infusion pump type refrigerator is as follows:
the pumping pressure LP of the infusion pump 5 is larger than the difference between the temperature saturation vapor pressure V (tc) of the refrigerating medium tc in the condenser 3 and the temperature saturation vapor pressure V (te) of the refrigerating medium te in the evaporator 1, wherein LP is larger than V (tc) -V (te); the infusion pump 5 pumps the refrigeration medium of the condenser 3 into the evaporator 1, so that the liquid level of the refrigeration medium of the evaporator 1 is higher than the liquid level H of the refrigeration medium of the condenser, and the liquid level is rho gH = V (tc) -V (te), rho is the specific gravity of the refrigeration medium liquid, and g is the gravity acceleration; the refrigeration medium in the evaporator 1 absorbs the heat Q of the secondary refrigerant to evaporate, so that the temperature of the secondary refrigerant is reduced; under the drive of the pump pressure LP of the infusion pump 5, the refrigeration medium steam generated by the evaporator 1 flows back to the condenser through the steam return pipe 2, the refrigeration medium condensed into liquid is released in the condenser 3, and the heat release D of the steam condensation is taken away by the heat release medium; realizing the refrigeration cycle process of heat absorption, evaporation, heat release and condensation; the vapor pressure at the liquid level of the refrigeration medium of the evaporator 1 is Pe, the vapor pressure at the liquid level of the refrigeration medium of the condenser 3 is Pc, and the friction resistance pressure drop of the vapor of the refrigeration medium flowing from the evaporator 1 to the condenser 3 is Pe-Pc; the pump pressure LP of the infusion pump 5 is further increased, the pump-in flow of the refrigerating medium is increased, the steam flow is increased, and finally the refrigerating capacity Q is increased.
If the medium flow direction of the infusion pump 5 is changed to be changed, the refrigerating machine is changed into a heat transfer heat pump which supplies heat to the secondary refrigerant by a heat radiation medium.
To facilitate understanding of the refrigeration process, the refrigerant medium circuit pressure balance equation is set forth:
LP=ρgH+(Pe-Pc)=V(tc)-V(te)+(Pe-Pc)
rho is the specific gravity of the medium liquid, g is the gravity acceleration, and H is the height difference of the liquid level of the medium;
v (tc) is the saturated vapor pressure of the temperature of the refrigeration medium tc in the condenser;
v (te) is the saturated vapor pressure of the temperature te of the refrigerant medium in the evaporator;
Pe-Pc is the friction resistance pressure drop of the medium steam flow;
LP is pump pressure, which is the pressure difference between the outlet and the inlet of the pump and is 2 times of the pump head pressure of the infusion pump.
In the pressure balance equation, the smaller liquid flow frictional resistance pressure drop is ignored. When LP = ρ gH = v (tc) -v (te), no steam flows between the evaporator and the condenser, Pe = Pc, the pump pressure at this time being the refrigeration starting pump pressure; refrigeration begins to occur when the pump pressure LP is greater than the refrigeration starting pump pressure.
The refrigeration cycle of the infusion pump type refrigerator is a new refrigeration cycle comprising the steps of evaporation heat absorption, steam pressure reduction reflux, condensation heat release and liquid pressurization pumping. Refrigeration cycle with compression refrigerator: the method is different from the method of evaporation heat absorption, vapor compression pressurization, condensation heat release and liquid reflux decompression. It is also different from the absorption refrigeration cycle of the absorption refrigerator.
Because the liquid density is far greater than the steam density, the transmission efficiency of the liquid medium transmitted by the infusion pump is higher than that of the steam medium transmitted by the compressor; the pumping pressure of the infusion pump is smaller than the steam pressure difference of the compressor, and the power consumption is low; the infusion pump type refrigerator of the present invention has higher refrigeration efficiency than a compression type refrigerator.
In fig. 3 to 5, there is a heat conduction temperature difference between the heat exchanger tube walls in the evaporator 1 and the condenser 3; the temperature of the liquid refrigeration medium in the evaporator is lower than the temperature of the circulating secondary refrigerant, for example, when the temperature of the secondary refrigerant is 10 ℃, the temperature te of the liquid refrigeration medium is 5 ℃, and heat flows to the refrigeration medium from the circulating secondary refrigerant; the temperature of the liquid refrigerant in the condenser 3 is higher than the temperature of the circulating heat-dissipating medium, for example, when the temperature of the heat-dissipating medium is 30 ℃, the temperature tc of the liquid refrigerant is 35 ℃, and heat flows from the refrigerant to the heat-dissipating medium.
| Temperature of | 5 | 10 | 15 | 30 | 35 | 45 | 100 |
| Air pressure kPa | 0.87 | 1.23 | 1.71 | 4.24 | 5.62 | 9.58 | 101.3 |
The saturated vapor pressure of water is as follows,
the refrigeration medium used in embodiment 1 of the present invention is water, which is referred to as medium water; the secondary refrigerant is secondary cold water; the heat dissipation medium is cooling water.
When in operation, the extraction refrigerator is communicated with the inner cavity to be in high vacuum, and proper medium water is injected, so that the liquid level is higher than the height of the infusion pump 5 by more than 1 m. Further adopts a vacuum-pumping exhaust method to remove the non-condensable inert gas in the inner cavity of the refrigerator.
Under a certain refrigerating capacity, when the temperature of the circulating cold water is 10 ℃, the temperature te of medium water in the evaporator 1 is 5 ℃; the temperature tc of the medium water in the condenser 3 is 35 ℃ when the temperature of the circulating cooling water is 30 ℃. If the infusion pump 5 stops working, the medium water in the condenser 3 boils and vaporizes, the liquid surface pressure Pc is equal to the saturated vapor pressure of water at 35 ℃, and the vapor flows from the condenser 3 to the evaporator 1, namely the vapor flows from the hot end to the cold end, which is the same as the heat transfer of a heat pipe.
The infusion pump 5 is operated, when the pump pressure LP is larger than the pressure difference between the water saturation vapor pressure at 35 ℃ and the water saturation vapor pressure at 5 ℃, and LP is larger than V (35 ℃) -V (5 ℃) =5.62-0.87=4.75kPa ≈ 48cm of water pressure, the pump pressure is enough to overcome the saturation evaporation resistance, the height difference H =48cm of the water level of the medium is formed, and the pressure drop Pe-Pc caused by the friction resistance of the water vapor flowing from the evaporator 1 to the condenser 3 is overcome; at the moment, the liquid level pressure Pe of the medium water in the evaporator 1 is =0.87kPa, the medium water in the evaporator 1 absorbs the heat of the circulating cold water to evaporate and vaporize, the steam flows from the evaporator to the condenser, the steam is condensed and liquefied in the condenser 3, and the circulating cooling water carries away the steam to condense and release heat; further increasing the pump pressure LP, i.e. increasing the residual pressure above 4.75kPa, will increase the pump-in liquid flow, increase the steam flow, and finally increase the refrigeration capacity Q.
In the embodiment 2 of the invention, the refrigeration medium is medium water; the secondary refrigerant is indoor air; the outdoor air dissipates heat, and the heat dissipation medium is the outdoor air.
Under a certain refrigerating capacity and at the indoor air temperature of 20 ℃, the water temperature te of a medium in the evaporator 1 is 15 ℃; when the outdoor air temperature is 40 ℃, the medium water temperature tc in the condenser 3 is 45 ℃. At this time, the pump pressure LP of the liquid conveying pump 5 is greater than the saturated steam pressure difference of 9.58-1.71=7.87kPa ≈ 79cm of water pressure, the height difference H =79cm of the formed liquid level of the medium, and the refrigerating machine starts refrigerating operation. The power consumption of an infusion pump with the pump pressure of more than 7.87kPa is lower than that of a vapor compressor with the pressure difference of 200 and 500kPa with the same refrigeration capacity, the energy is saved, and the cost is low.
The condenser 3 is arranged at a position which is about 79cm lower than the evaporator 1, so that the medium water level of the condenser 3 is at a proper position, and the steam condensation and heat dissipation of the condenser 3 are facilitated.
In example 3 of the present invention, the same media of water, air refrigeration and air heat dissipation are used as in example 2. A throttle valve 7 is additionally arranged in the infusion tube 4 in series, and can assist in adjusting medium water flow, adjusting refrigerating capacity and finally adjusting and controlling indoor air temperature.
As shown in fig. 6, in this embodiment, a throttle valve 7 is connected in series to the steam return pipe 2, and the refrigerant medium water charge amount is about 95%; the refrigeration method of the infusion pump type refrigerator is as follows:
the pumping pressure LP of the infusion pump 5 is larger than the difference between the temperature saturation vapor pressure V (tc) of the refrigerating medium tc in the condenser 3 and the temperature saturation vapor pressure V (te) of the refrigerating medium te in the evaporator 1, wherein LP is larger than V (tc) -V (te); the infusion pump 5 pumps the refrigerating medium water of the condenser 3 into the evaporator 1; the refrigeration medium water in the evaporator 1 absorbs the heat Q of the circulating refrigerating medium to evaporate and vaporize, so that the temperature of the refrigerating medium is reduced; under the drive of the pump pressure LP of the infusion pump 5, the refrigeration medium vapor generated by the evaporator 1 flows back to the condenser 3 through the vapor return pipe 2 and the throttle valve 7, the refrigeration medium water condensed into liquid is released in the condenser 3, and the heat release D of the vapor condensation is taken away by circulating flow through a heat dissipation medium; realizing the refrigeration cycle process of heat absorption, evaporation, heat release and condensation; further increasing the pump pressure LP of the infusion pump 5, pumping out and pumping in the increased refrigerating medium water flow, increasing the steam flow, and finally increasing the refrigerating capacity Q;
the throttle valve 7 has a function of throttling the flow of the refrigeration medium water vapor, reduces the high-pressure refrigeration medium water vapor pressure, and controls the flow of the refrigeration medium water vapor flowing into the condenser 3, and the throttling pressure difference delta JP = V (t) at two ends of the throttle valve 7c)-V(te) And LP-Delta JP is the friction resistance pressure drop of the pipe wall for the flow of the refrigeration medium water vapor and the refrigeration medium water liquid.
The embodiments of the present invention are described in detail above with reference to the drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention.
Claims (8)
1. An infusion pump type refrigerator is characterized in that the refrigerator comprises an evaporator (1), a steam return pipe (2), a condenser (3), an infusion pipe (4) and an infusion pump (5); one end of the infusion tube (4) is hermetically communicated with the bottom of the evaporator (1), the other end of the infusion tube (4) is hermetically communicated with the bottom of the condenser (3), and the infusion pump (5) is hermetically connected in series on the infusion tube (4); one end of the steam return pipe (2) is communicated with the top of the evaporator (1) in a sealing way, and the other end of the steam return pipe (2) is communicated with the top of the condenser (3) in a sealing way; circulating a refrigerating medium in a heat exchanger in the evaporator (1) and circulating a radiating medium in a heat exchanger in the condenser (3);
the vacuum pump is characterized in that communicated inner cavities of the evaporator (1), the steam return pipe (2), the condenser (3), the infusion pipe (4) and the infusion pump (5) are vacuumized, a refrigeration medium is injected into the vacuum communicated inner cavities of the evaporator (1), the steam return pipe (2), the condenser (3), the infusion pipe (4) and the infusion pump (5), the liquid level of the refrigeration medium is higher than that of the infusion pump (5), and when the refrigerator operates, the liquid level of the refrigeration medium in the condenser (3) is still higher than that of the infusion pump (5).
2. An infusion pump refrigerator according to claim 1, characterized in that the condenser (3) is placed at a lower H level than the evaporator (1); the height H is the height difference that the liquid level of the refrigerating medium of the condenser (3) is lower than that of the refrigerating medium of the evaporator (1) when the refrigerator operates.
3. The infusion pump type refrigerator according to claim 1, wherein an air storage tank (6) communicated with the return pipe (2) is installed at the highest position of the return pipe (2), and a vacuum pumping nozzle, a vacuum valve or a liquid injection nozzle can be arranged on the air storage tank (6).
4. An infusion pump refrigerator according to claim 1, characterized in that a throttle valve (7) is also connected in series to the infusion tube (4).
5. A method of cooling an infusion pump type refrigerator according to claim 1, characterized by comprising:
the pumping pressure LP of the infusion pump (5) is larger than the difference between the temperature saturation vapor pressure V (tc) of the refrigerating medium tc in the condenser (3) and the temperature saturation vapor pressure V (te) of the refrigerating medium te in the evaporator (1), wherein LP is larger than V (tc) -V (te); the infusion pump (5) pumps the refrigeration medium of the condenser (3) into the evaporator (1) so that the liquid level of the refrigeration medium of the evaporator (1) is higher than the liquid level H of the refrigeration medium of the condenser, and the liquid level has rho gH = V (tc) -V (te), rho is the specific gravity of the refrigeration medium liquid, and g is the gravity acceleration; the refrigeration medium in the evaporator (1) absorbs the heat Q of the circulating secondary refrigerant to evaporate and vaporize, so that the temperature of the secondary refrigerant is reduced; under the drive of the pump pressure LP of the infusion pump (5), medium steam generated by the evaporator (1) flows back to the condenser through the steam return pipe (2), a refrigeration medium condensed into liquid is released in the condenser (3), and the heat release D of the steam condensation is taken away by the circulating heat release medium; realizing the refrigeration cycle process of heat absorption, evaporation, heat release and condensation; the vapor pressure of the liquid level of the refrigeration medium of the evaporator (1) is Pe, the vapor pressure of the liquid level of the refrigeration medium of the condenser (3) is Pc, and the friction resistance pressure drop of the vapor of the refrigeration medium flowing from the evaporator (1) to the condenser (3) is Pe-Pc; the pumping pressure LP of the infusion pump (5) is further increased, the pumping-in flow of the refrigerant medium is increased, the steam flow is increased, and finally the refrigerating capacity Q is increased.
6. A method as claimed in claim 5, characterized in that the flow direction of the medium in the infusion pump is redirected and the refrigeration machine is changed to a heat-transfer heat pump in which the circulating heat-transfer medium supplies heat to the circulating coolant.
7. An infusion pump refrigerator according to claim 1, characterized in that a throttle valve (7) is connected in series in the return line (2) and the optimum charge of refrigerant medium is between 85% and 99%.
8. A method of cooling an infusion pump refrigerator according to claim 7, characterized by comprising:
the pumping pressure LP of the infusion pump (5) is larger than the difference between the temperature saturation vapor pressure V (tc) of the refrigerating medium tc in the condenser (3) and the temperature saturation vapor pressure V (te) of the refrigerating medium te in the evaporator (1), wherein LP is larger than V (tc) -V (te); the infusion pump (5) pumps the refrigerating medium liquid of the condenser (3) into the evaporator (1); the refrigeration medium in the evaporator (1) absorbs the heat Q of the circulating refrigerating medium to evaporate and vaporize, so that the temperature of the refrigerating medium is reduced; under the drive of the pump pressure LP of the infusion pump (5), the refrigeration medium steam generated by the evaporator (1) flows back to the condenser (3) through the steam return pipe (2) and the throttle valve (7), the refrigeration medium condensed into liquid is released in the condenser (3), and the heat release D of the steam condensation is taken away by circulating flow of the heat dissipation medium; realizing the refrigeration cycle process of heat absorption, evaporation, heat release and condensation; further increasing the pumping pressure LP of the infusion pump (5), pumping out and pumping in the increased refrigerating medium, increasing the steam flow, and finally increasing the refrigerating capacity Q;
the throttle valve (7) has the function of throttling the flow of the refrigeration medium steam, reduces the high-pressure refrigeration medium steam pressure, controls the flow of the refrigeration medium steam flowing into the condenser (3), and the throttle pressure difference delta JP = V (t) at two ends of the throttle valve (7)c)-V(te) And LP-Delta JP is the pipe wall friction resistance pressure drop of the flowing of the refrigeration medium steam and the refrigeration medium liquid.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110305634 | 2021-03-23 | ||
| CN2021103056348 | 2021-03-23 |
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| CN113048673A true CN113048673A (en) | 2021-06-29 |
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| CN202110402940.3A Withdrawn CN113048673A (en) | 2021-03-23 | 2021-04-15 | Infusion pump type refrigerator and refrigeration method |
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| CN1896501A (en) * | 2005-07-12 | 2007-01-17 | 孟英志 | Energy conversion and converter, power generation and generator |
| CN202229484U (en) * | 2011-03-04 | 2012-05-23 | 深圳市雅尔典科技有限公司 | Super high-rise building cooling and heating air-conditioning system design scheme with energy delivery by liquid pump or air pump replacing water pump |
| CN103307683A (en) * | 2013-07-04 | 2013-09-18 | 北京德能恒信科技有限公司 | Hot pipe and air conditioner all-in-one machine |
| CN105546870A (en) * | 2015-12-31 | 2016-05-04 | 浙江理工大学 | Supergravity thermal drive refrigeration device and method |
| CN105546877A (en) * | 2016-01-11 | 2016-05-04 | 浙江理工大学 | Gravitational field low-grade heat source conversion device and method |
| CN110500688A (en) * | 2019-09-24 | 2019-11-26 | 华北理工大学 | The diluting type refrigeration heat pump system of air conditioning is carried out using the heat of dilution |
-
2021
- 2021-04-15 CN CN202110402940.3A patent/CN113048673A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1896501A (en) * | 2005-07-12 | 2007-01-17 | 孟英志 | Energy conversion and converter, power generation and generator |
| CN202229484U (en) * | 2011-03-04 | 2012-05-23 | 深圳市雅尔典科技有限公司 | Super high-rise building cooling and heating air-conditioning system design scheme with energy delivery by liquid pump or air pump replacing water pump |
| CN103307683A (en) * | 2013-07-04 | 2013-09-18 | 北京德能恒信科技有限公司 | Hot pipe and air conditioner all-in-one machine |
| CN105546870A (en) * | 2015-12-31 | 2016-05-04 | 浙江理工大学 | Supergravity thermal drive refrigeration device and method |
| CN105546877A (en) * | 2016-01-11 | 2016-05-04 | 浙江理工大学 | Gravitational field low-grade heat source conversion device and method |
| CN110500688A (en) * | 2019-09-24 | 2019-11-26 | 华北理工大学 | The diluting type refrigeration heat pump system of air conditioning is carried out using the heat of dilution |
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