CN107388625B - Heat pump system, heat pump drying system and control method thereof - Google Patents
Heat pump system, heat pump drying system and control method thereof Download PDFInfo
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- CN107388625B CN107388625B CN201710665190.2A CN201710665190A CN107388625B CN 107388625 B CN107388625 B CN 107388625B CN 201710665190 A CN201710665190 A CN 201710665190A CN 107388625 B CN107388625 B CN 107388625B
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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
- F25B30/02—Heat pumps of the compression type
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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
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control 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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
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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
- 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
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
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Abstract
The invention provides a heat pump system, a heat pump drying system and a control method thereof. The heat pump system comprises a compressor, a condenser, a first throttling element, an evaporator, an auxiliary heat exchange device and a switching assembly, wherein the auxiliary heat exchange device can be selectively connected with the condenser in parallel to form two condensation heat exchange branches under the action of the switching assembly, or connected with the evaporator in parallel to form two evaporation heat exchange branches. The auxiliary heat exchange device is arranged in the heat pump system, can be selectively used as a condenser or an evaporator under the action of the switching component so as to meet different heat exchange requirements, and can simultaneously solve the problems that the starting process of the system is slow and the temperature cannot be regulated through the same auxiliary heat exchange device when the auxiliary heat exchange device is applied to a heat pump drying system.
Description
Technical Field
The invention relates to the field of heat pumps, in particular to a heat pump system, a heat pump drying system and a control method thereof.
Background
In a conventional closed heat pump drying system, as the evaporator and the condenser are arranged in the closed circulating air duct, the problems that the starting process is slow and temperature cannot be regulated exist, in the existing structure, the starting speed of the system is generally improved by adding an auxiliary evaporator or an auxiliary heater in the system, the temperature of the system is regulated by adding an auxiliary condenser or an auxiliary cooler in the system, the structure is complex, and the cost of the system is increased.
Disclosure of Invention
Accordingly, one of the purposes of the present invention is to provide a heat pump system, a heat pump drying system and a control method thereof, which can solve the problems of slow starting process and incapability of temperature adjustment of the existing heat pump drying system, and has the advantages of simple structure and low cost.
In order to achieve the above purpose, on one hand, the present invention adopts the following technical scheme:
the heat pump system comprises a compressor, a condenser, a first throttling element, an evaporator, an auxiliary heat exchange device and a switching assembly, wherein the auxiliary heat exchange device can be selectively connected with the condenser in parallel to form two condensation heat exchange branches or connected with the evaporator in parallel to form two evaporation heat exchange branches under the action of the switching assembly.
Preferably, the switching assembly is configured such that the two condensing heat exchange branches share the first throttling element,
or alternatively, the process may be performed,
the heat pump system further comprises a second throttling element, and the switching assembly is configured such that when the auxiliary heat exchange device and the condenser are connected in parallel to form two condensation heat exchange branches, the first throttling element and the second throttling element are respectively positioned on the two condensation heat exchange branches.
Preferably, the switching assembly is configured such that the two evaporation heat exchange branches share the first throttling element,
or alternatively, the process may be performed,
the heat pump system further comprises a second throttling element, and the switching assembly is configured such that when the auxiliary heat exchange device and the evaporator are connected in parallel to form two evaporation heat exchange branches, the first throttling element and the second throttling element are respectively positioned on the two evaporation heat exchange branches.
Preferably, the switching assembly includes a first switching unit for selectively connecting the first port of the auxiliary heat exchange device with the refrigerant outlet port of the evaporator or the refrigerant inlet port of the condenser, and a second switching unit for selectively connecting the second port of the auxiliary heat exchange device with the refrigerant inlet port of the evaporator/the first throttling element or the refrigerant outlet port of the condenser.
Preferably, the first switching unit includes a first branch and a second branch, the first branch is connected with the first port of the auxiliary heat exchange device and the refrigerant outlet end of the evaporator, the second branch is connected with the first port of the auxiliary heat exchange device and the refrigerant inlet end of the condenser, the first branch is provided with a first switch, and the second branch is provided with a second switch.
Preferably, the second switching unit includes a third branch and a fourth branch, the third branch is connected with the refrigerant inlet end of the first throttling element and the second port of the auxiliary heat exchange device, the fourth branch is connected with the refrigerant outlet end of the condenser and the second port of the auxiliary heat exchange device, the fourth branch is provided with a second throttling element, when the second throttling element is opened, the fourth branch is connected, the auxiliary heat exchange device is connected with the evaporator in parallel to form two evaporation heat exchange branches, when the second throttling element is closed, the fourth branch is disconnected, and the auxiliary heat exchange device is connected with the condenser in parallel to form two condensation heat exchange branches.
Preferably, a third switch or a check valve that allows only the refrigerant to flow from the auxiliary heat exchange device toward the first throttling element is provided on the third branch.
Preferably, the second switching unit includes a main path, and a fifth branch path and a sixth branch path formed by branching an outlet end of the main path, an inlet end of the main path is connected to the second port of the auxiliary heat exchange device, the fifth branch path and the sixth branch path are respectively connected to a refrigerant inlet end of the evaporator and a refrigerant outlet end of the condenser, and a second throttling element is disposed on the main path.
Preferably, a fourth switch is disposed on the fifth branch, and a fifth switch is disposed on the sixth branch.
On the other hand, the invention adopts the following technical scheme:
the heat pump drying system comprises the heat pump system and further comprises a circulating channel for circulating the circulating working medium in the space to be dried, wherein the evaporator and the condenser are both arranged in the circulating channel, and the auxiliary heat exchange device is arranged outside the circulating channel.
In yet another aspect, the present invention employs the following technical scheme:
a control method of the heat pump drying system as described above, the heat pump drying system having a temperature regulation mode, the switching assembly connecting the auxiliary heat exchange device in parallel with the evaporator to form two evaporation heat exchange branches during a start-up phase of the heat pump drying system;
and/or the number of the groups of groups,
when the heat pump drying system operates in a temperature regulation mode, the switching assembly connects the auxiliary heat exchange device and the condenser in parallel to form two condensation heat exchange branches.
In yet another aspect, the present invention employs the following technical scheme:
the control method of the heat pump drying system comprises the heat pump system, and further comprises a circulating channel for circulating a circulating working medium in a space to be dried, wherein the evaporator and the condenser are both arranged in the circulating channel, and the auxiliary heat exchange device is arranged outside the circulating channel;
the heat pump drying system has a temperature regulation mode,
the control method comprises the following steps:
and when the heat pump drying system operates in a temperature regulation mode, the sixth branch is closed, the fifth branch is opened, and the temperature regulation is performed by controlling the opening degrees of the first throttling element and the second throttling element.
The auxiliary heat exchange device is arranged in the heat pump system, can be selectively used as a condenser or an evaporator under the action of the switching component so as to meet different heat exchange requirements, and can simultaneously solve the problems that the starting process of the system is slow and the temperature cannot be regulated through the same auxiliary heat exchange device when the auxiliary heat exchange device is applied to a heat pump drying system.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention with reference to the accompanying drawings, in which:
fig. 1 shows one of schematic structural diagrams of a heat pump drying system according to an embodiment of the present invention;
fig. 2 shows a second schematic structural diagram of a heat pump drying system according to an embodiment of the present invention.
In the figure, 1, a compressor; 2. a condenser; 3. a first electronic expansion valve; 4. an evaporator; 5. a circulating air duct; 6. a space to be dried; 7. an inner fan; 8. a heat pipe; 9. an auxiliary heat exchange device; 10. an external fan; 11. a first branch; 111. a first electromagnetic valve; 12. a second branch; 121. a second electromagnetic valve; 13. a third branch; 131. a one-way valve; 14. a fourth branch; 141. a second electronic expansion valve; 15. a fifth branch; 151. a third electromagnetic valve; 16. a sixth branch; 161. a fourth electromagnetic valve; 17. and (5) an overall path.
Detailed Description
The present invention is described below based on embodiments, and it will be understood by those of ordinary skill in the art that the drawings provided herein are for illustrative purposes and that the drawings are not necessarily drawn to scale.
Unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, it is the meaning of "including but not limited to".
The present application provides a heat pump system, and the specific structure of the heat pump system will be described below by taking the application of the heat pump system to a heat pump drying system as an example, and it will be understood that the heat pump system is also applicable to other systems with similar heat exchange requirements. As shown in fig. 1, the heat pump drying system comprises a heat pump system, a circulation channel and a heat pipe 8, wherein the heat pump system comprises a compressor 1, a condenser 2, a first throttling element and an evaporator 4, wherein the first throttling element can be, for example, a first electronic expansion valve 3, and can also be of other structures capable of playing a role in throttling, and the compressor 1, the condenser 2, the first electronic expansion valve 3 and the evaporator 4 can form a conventional refrigerant circulation loop. The condenser 2 and the evaporator 4 are both arranged in a circulation channel, the circulation channel is used for circulating a circulation working medium such as air in the space 6 to be dried, the circulation channel is a circulation air channel 5, an air inlet and an air outlet of the circulation air channel 5 are both communicated with the space 6 to be dried, an inner fan 7 is further arranged in the circulation air channel 5, and the circulation working medium such as air in the space 6 to be dried is driven to circulate in the circulation air channel 5 under the action of the inner fan 7 so as to dry the space 6 to be dried. The heat absorbing end and the heat releasing end of the heat pipe 8 are respectively arranged at the air inlet and the air outlet of the evaporator 4, the air inlet and the air outlet of the evaporator 4 must pass through the two ends of the heat pipe 8, and the heat pipe circulation can be in the forms of gravity circulation, pump circulation, siphon action and the like. The working medium in the heat absorbing end absorbs heat and evaporates to reach the heat releasing end for condensation and heat dissipation because of temperature difference, and then flows back to the low temperature end because of gravity or pump or siphon action, so as to form a heat pipe circulation. The temperature of the circulating working medium at the outlet of the evaporator 4 is heated while the temperature of the circulating working medium at the inlet of the evaporator 4 is reduced through heat pipe circulation, so that the cooling load of the evaporator 4 is reduced while the heating load of the condenser 2 is also reduced, the output capacity of the whole system is reduced, the energy efficiency is improved, and the operation cost is reduced.
Further, the heat pump system further comprises an auxiliary heat exchange device 9 and a switching assembly, wherein the auxiliary heat exchange device can be selectively connected in parallel with the condenser 2 under the action of the switching assembly to form two condensation heat exchange branches, and the auxiliary heat exchange device 9 is used as an auxiliary condenser at this time, or connected in parallel with the evaporator 4 to form two evaporation heat exchange branches, and the auxiliary heat exchange device 9 is used as an auxiliary evaporator at this time.
The auxiliary heat exchange device 9 is arranged outside the circulating air channel 5, preferably, an external fan 10 is further arranged on one side of the auxiliary heat exchange device 9, and the external fan 10 can promote heat exchange between external air and the auxiliary heat exchange device 9, so when the heat pump drying system is in a starting stage (the starting stage is a stage that the heat pump drying system is started until the circulating working medium reaches a preset temperature in the application), the auxiliary heat exchange device 9 is connected with the evaporator 4 in parallel, the auxiliary heat exchange device 9 is used as an auxiliary evaporator, the heat pump system can absorb external heat through the auxiliary heat exchange device 9 serving as the auxiliary evaporator to heat the circulating working medium in the circulating air channel 5, thereby accelerating the starting process, specifically, as the refrigerant in the auxiliary heat exchange device 9 serving as the auxiliary evaporator is in a low-temperature low-pressure state, the refrigerant is evaporated and gasified after absorbing the heat in the external air, the gasified low-pressure refrigerant enters the compressor 1 to be compressed into a high-temperature high-pressure gaseous refrigerant, and is discharged into the condenser 2, so that the absorbed external heat is transferred to the circulating working medium in the circulating air channel 5 through the condenser 2, and the heating speed of the circulating working medium in the circulating air channel 5 is accelerated, and the starting speed of the system is increased.
When the heat pump drying system is in a temperature regulation mode, namely when the ambient temperature in the space 6 to be dried needs to be regulated, the auxiliary heat exchange device 9 is connected with the condenser 2 in parallel, so that the auxiliary heat exchange device 9 is used as an auxiliary condenser, and the heat pump system can release redundant heat in the space 6 to be dried to external ambient air through the auxiliary heat exchange device 9 serving as the auxiliary condenser, so that the aim of regulating temperature is fulfilled. Specifically, since the temperature of the refrigerant in the auxiliary heat exchange device 9 serving as the auxiliary condenser is higher than the outside (the outside here refers to the space 6 to be dried and the environment outside the circulating air duct 5), the heat of the refrigerant in the auxiliary heat exchange device 9 can be released to the outside to achieve the purpose of cooling.
When the auxiliary heat exchange device 9 is connected in parallel with the condenser 2 to form two condensation heat exchange branches, the two condensation heat exchange branches may share the first electronic expansion valve 3, that is, the refrigerants in the two condensation heat exchange branches are both collected into the first electronic expansion valve 3 to throttle, preferably, a second throttling element is further provided, for example, the second throttling element may be the second electronic expansion valve 141, or may be other structures capable of throttling the refrigerant, and the switching assembly is configured such that, when the auxiliary heat exchange device 9 is connected in parallel with the condenser 2 to form two condensation heat exchange branches, the first electronic expansion valve 3 and the second electronic expansion valve 141 are respectively located on the two condensation heat exchange branches, and thus, the proportion of the amount of the refrigerant entering the two condensation heat exchange branches can be changed by adjusting the opening degrees of the first electronic expansion valve 3 and the second electronic expansion valve 141.
Similarly, when the auxiliary heat exchange device 9 is connected in parallel with the evaporator 4 to form two evaporation heat exchange branches, the two evaporation heat exchange branches may share the first electronic expansion valve 3, that is, the refrigerant throttled by the first electronic expansion valve 3 enters the two evaporation heat exchange branches respectively, preferably, the switching assembly is configured such that, when the auxiliary heat exchange device 9 is connected in parallel with the evaporator 4 to form two evaporation heat exchange branches, the first electronic expansion valve 3 and the second electronic expansion valve 141 are located on the two evaporation heat exchange branches respectively, and thus, the proportion of the amount of the refrigerant entering the two evaporation heat exchange branches can be changed by adjusting the opening degrees of the first electronic expansion valve 3 and the second electronic expansion valve 141.
Further, the switching assembly may be any structure capable of realizing the above functions, and the requirement of changing the connection position of the auxiliary heat exchange device 9 may be satisfied by a combination of switch elements such as a two-way valve, a three-way valve, a four-way valve, a one-way valve, and the like.
For example, in one embodiment, as shown in fig. 1, the switching assembly includes a first switching unit for selectively connecting the first port of the auxiliary heat exchanging device 9 with the refrigerant outlet port of the evaporator 4 or the refrigerant inlet port of the condenser 2, and a second switching unit for selectively connecting the second port of the auxiliary heat exchanging device 9 with the refrigerant inlet port of the first electronic expansion valve 3 (or the refrigerant inlet port of the evaporator 4, see description later) or the refrigerant outlet port of the condenser 2.
Further, the first switching unit includes a first branch 11 and a second branch 12, the first branch 11 is connected to the first port of the auxiliary heat exchange device 9 and the refrigerant outlet end of the evaporator 4, the second branch 12 is connected to the first port of the auxiliary heat exchange device 9 and the refrigerant inlet end of the condenser 2, the first branch 11 is provided with a first switch, for example, the first switch may be a first electromagnetic valve 111 shown in fig. 1, the second branch 12 is provided with a second switch, for example, the second switch may be a second electromagnetic valve 121 shown in fig. 1, and the on-off of the first branch 11 and the second branch 12 is achieved by controlling the first electromagnetic valve 111 and the second electromagnetic valve 121.
The second switching unit comprises a third branch 13 and a fourth branch 14, the third branch 13 is connected with the refrigerant inlet end of the first electronic expansion valve 3 and the second port of the auxiliary heat exchange device 9, the fourth branch 14 is connected with the refrigerant outlet end of the condenser 2 and the second port of the auxiliary heat exchange device 9, the second electronic expansion valve 141 is arranged on the fourth branch 14, when the second electronic expansion valve 141 is opened, the fourth branch 14 is connected, the auxiliary heat exchange device 9 is connected with the evaporator 4 in parallel to form two evaporation heat exchange branches, when the second electronic expansion valve 141 is closed, the fourth branch 14 is disconnected, and the auxiliary heat exchange device 9 is connected with the condenser 2 in parallel to form two condensation heat exchange branches. In order to avoid the backflow of the refrigerant on the third branch 13 of the refrigerant, preferably, the third branch 13 is provided with a check valve 131 which only allows the refrigerant to flow from the auxiliary heat exchange device 9 to the direction of the first electronic expansion valve 3, and it is understood that the check valve 131 may be replaced by a third switch, and the third switch may be, for example, an electromagnetic valve.
The control method of the heat pump drying system shown in fig. 1 includes:
in the starting stage of the heat pump drying system, the first electromagnetic valve 111 is opened, the second electromagnetic valve 121 is closed, the first electronic expansion valve 3 and the second electronic expansion valve 141 are both opened and the opening degree can be automatically controlled according to a program built in the heat pump system so as to obtain a required refrigerant state, and the flow route of the refrigerant is as follows:
in the starting stage, the auxiliary heat exchange device 9 is used as an auxiliary evaporator, and the refrigerant absorbs external heat at the auxiliary heat exchange device 9 and heats the circulating working medium by using the external heat, so that the circulating working medium reaches a preset temperature as soon as possible, and the starting process of the heat pump drying system is completed. In order to make the refrigerant flow into the auxiliary heat exchange device as much as possible, the opening of the first electronic expansion valve 3 can be set to be very small, even the first electronic expansion valve 3 is closed, and when the temperature of the circulating working medium is gradually increased, the opening of the first electronic expansion valve 3 can be gradually increased.
In this stage, since the third branch 13 is provided with the check valve 131, a reverse pressure difference exists between two ends of the check valve 131, the high-pressure refrigerant liquid from the condenser 2 cannot enter the auxiliary heat exchange device 9 through the check valve 131, and the low-pressure refrigerant liquid from the second electronic expansion valve 141 cannot flow to the inlet end of the first electronic expansion valve 3 through the check valve 131.
When the heat pump drying system operates in the normal drying mode, the first electromagnetic valve 111 and the second electromagnetic valve 121 are both closed, the first electronic expansion valve 3 is opened and can automatically control the opening according to a program built in the heat pump system, the second electronic expansion valve 141 is closed, and the flow route of the refrigerant is as follows:
compressor, condenser, first electronic expansion valve, evaporator and compressor
In this mode, the damp-heat cycle working medium flowing through the evaporator 4 is cooled, if the temperature of the cooled cycle working medium is lower than the dew point temperature under the current pressure, the moisture in the cycle working medium is condensed, so that part of the moisture in the cycle working medium is removed to form a saturated cycle working medium, the saturated cycle working medium is heated in the condenser 2 to raise the temperature, the relative humidity of the saturated cycle working medium is reduced, and the capacity of absorbing the moisture in the material is enhanced again. The circulating process can continuously absorb moisture from the materials and discharge the moisture to the outside so as to achieve the aim of drying.
When the heat pump drying system operates in the temperature regulation mode, the first electromagnetic valve 111 is closed, the second electromagnetic valve 121 is opened, the first electronic expansion valve 3 is opened and can automatically control the opening according to a program built in the heat pump system, the second electronic expansion valve 141 is closed, and the flow route of the refrigerant is as follows:
in this mode, the auxiliary heat exchange device 9 is used as an auxiliary condenser, and is in parallel connection with the condenser, and the heat pump system releases excessive heat to the external ambient air through the auxiliary heat exchange device 9 so as to achieve the purpose of adjusting the temperature of the circulating working medium.
In an alternative embodiment, as shown in fig. 2, the second switching unit is used to selectively connect the second port of the auxiliary heat exchange device 9 with the refrigerant inlet end of the evaporator 4 or the refrigerant outlet end of the condenser 2. The second switching unit may include, for example, a main path 17, and a fifth branch path 15 and a sixth branch path 16 formed by branching an outlet end of the main path 17, where an inlet end of the main path 17 is connected to the second port of the auxiliary heat exchange device 9, and the fifth branch path and the sixth branch path are respectively connected to a refrigerant inlet end of the evaporator and a refrigerant outlet end of the condenser, and the second electronic expansion valve 141 is disposed on the main path 17. The connection position of the second port of the auxiliary heat exchange device 9 is changed by controlling the on-off of the fifth branch circuit 15 and the sixth branch circuit 16. For example, a fourth switch is provided on the fifth branch 15, and the fourth switch may be, for example, the third solenoid valve 151 shown in fig. 2, and a fifth switch is provided on the sixth branch 16, and the fifth switch may be, for example, the fourth solenoid valve 161 shown in fig. 2.
The control method of the heat pump drying system shown in fig. 2 includes:
in the starting stage of the heat pump drying system, the first solenoid valve 111 and the fourth solenoid valve 161 are opened, the second solenoid valve 121 and the third solenoid valve 151 are closed, the first electronic expansion valve 3 and the second electronic expansion valve 141 are both opened and can automatically control the opening according to a program built in the heat pump system so as to obtain a required refrigerant state, and the flow route of the refrigerant is as follows:
when the heat pump drying system operates in the normal drying mode, the first solenoid valve 111, the second solenoid valve 121, the third solenoid valve 151 and the fourth solenoid valve 161 are all closed, the first electronic expansion valve 3 is opened and can automatically control the opening according to a program built in the heat pump system, the second electronic expansion valve 141 can be opened and can be closed, and the flow route of the refrigerant is as follows:
compressor, condenser, first electronic expansion valve, evaporator and compressor
When the heat pump drying system is in the temperature-adjusting mode, the first electromagnetic valve 111 and the fourth electromagnetic valve 161 are closed, the second electromagnetic valve 121 and the third electromagnetic valve 151 are opened, the first electronic expansion valve 3 and the second electronic expansion valve 141 are opened, the opening degree can be automatically controlled according to a program built in the heat pump system, and the flow route of the refrigerant is as follows:
in this mode, the auxiliary heat exchange device 9 is used as an auxiliary condenser, and is in parallel connection with the condenser, and the heat pump system releases excessive heat to the external ambient air through the auxiliary heat exchange device 9 so as to achieve the purpose of adjusting the temperature of the circulating working medium. The opening degree of the first electronic expansion valve 3 and the opening degree of the second electronic expansion valve 141 are controlled to realize the distribution of the refrigerant flow rate flowing to the two condensation heat exchange branches, so that the temperature is accurately regulated. For example, when the amount of refrigerant entering the condenser 2 is large, the amount of heat exchange with the circulating medium is large when the amount of refrigerant entering the auxiliary heat exchange device 9 is small, and when the amount of refrigerant entering the condenser 2 is small, the amount of heat exchange with the circulating medium is small when the amount of refrigerant entering the auxiliary heat exchange device 9 is large.
The flow process and heat exchange principle of the refrigerant in the drying heat pump system shown in fig. 2 in the start-up phase and the conventional drying mode state are similar to those of the drying heat pump system shown in fig. 1, and will not be repeated here.
Further preferably, since the switching control actions of the first solenoid valve 111 and the fourth solenoid valve 161 are the same, the first solenoid valve 111 and the fourth solenoid valve 161 share a control port, and similarly, the second solenoid valve 121 and the third solenoid valve 151 share a control port.
It is easy to understand by those skilled in the art that the above preferred embodiments can be freely combined and overlapped without conflict.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, and various modifications and variations may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. The utility model provides a heat pump system, its characterized in that includes compressor, condenser, first throttling element and evaporimeter, still includes auxiliary heat transfer device and switching component, auxiliary heat transfer device can be under the effect of switching component selectively with the condenser is parallelly connected in order to form two condensation heat transfer branch road, perhaps with the evaporimeter is parallelly connected in order to form two evaporation heat transfer branch road, wherein, the condenser with the evaporimeter sets up in the circulation path, the circulation path is the circulation wind channel, auxiliary heat transfer device sets up outside the circulation wind channel, one side of auxiliary heat transfer device is provided with the external fan, the external fan can promote external air with auxiliary heat transfer device carries out heat exchange.
2. The heat pump system of claim 1, wherein the switching assembly is configured such that the two condensing heat exchange branches share the first throttling element,
or alternatively, the process may be performed,
the heat pump system further comprises a second throttling element, and the switching assembly is configured such that when the auxiliary heat exchange device and the condenser are connected in parallel to form two condensation heat exchange branches, the first throttling element and the second throttling element are respectively positioned on the two condensation heat exchange branches.
3. The heat pump system of claim 1, wherein the switching assembly is configured such that the two evaporative heat exchange legs share the first throttling element,
or alternatively, the process may be performed,
the heat pump system further comprises a second throttling element, and the switching assembly is configured such that when the auxiliary heat exchange device and the evaporator are connected in parallel to form two evaporation heat exchange branches, the first throttling element and the second throttling element are respectively positioned on the two evaporation heat exchange branches.
4. The heat pump system of claim 1, wherein the switching assembly includes a first switching unit for selectively connecting the first port of the auxiliary heat exchange device with the refrigerant outlet port of the evaporator or the refrigerant inlet port of the condenser, and a second switching unit for selectively connecting the second port of the auxiliary heat exchange device with the refrigerant inlet port of the evaporator/the first throttling element or the refrigerant outlet port of the condenser.
5. The heat pump system of claim 4, wherein the first switching unit comprises a first branch and a second branch, the first branch connects the first port of the auxiliary heat exchange device with the refrigerant outlet end of the evaporator, the second branch connects the first port of the auxiliary heat exchange device with the refrigerant inlet end of the condenser, the first branch is provided with a first switch, and the second branch is provided with a second switch.
6. The heat pump system according to claim 4, wherein the second switching unit includes a third branch connecting the refrigerant inlet end of the first throttling element and the second port of the auxiliary heat exchanging device, and a fourth branch connecting the refrigerant outlet end of the condenser and the second port of the auxiliary heat exchanging device, the fourth branch being provided with a second throttling element, the fourth branch being turned on when the second throttling element is turned on, the auxiliary heat exchanging device being connected in parallel with the evaporator to form two evaporation heat exchanging branches, the fourth branch being turned off when the second throttling element is turned off, the auxiliary heat exchanging device being connected in parallel with the condenser to form two condensation heat exchanging branches.
7. The heat pump system according to claim 6, wherein a third switch or a check valve allowing only the refrigerant to flow from the auxiliary heat exchanging device toward the first throttling element is provided on the third branch.
8. The heat pump system according to claim 4, wherein the second switching unit includes a main path, and a fifth branch path and a sixth branch path formed by branching an outlet end of the main path, an inlet end of the main path is connected to the second port of the auxiliary heat exchanging device, the fifth branch path and the sixth branch path are respectively connected to a refrigerant inlet end of the evaporator and a refrigerant outlet end of the condenser, and a second throttling element is provided on the main path.
9. The heat pump system of claim 8, wherein a fourth switch is provided on the fifth leg and a fifth switch is provided on the sixth leg.
10. A heat pump drying system, characterized by comprising a heat pump system according to one of claims 1 to 9, further comprising a circulation channel for circulating a circulating working medium in a space to be dried, wherein the evaporator and the condenser are both disposed in the circulation channel, and the auxiliary heat exchange device is disposed outside the circulation channel.
11. A control method of a heat pump drying system according to claim 10, wherein the heat pump drying system has a temperature regulation mode, and the switching assembly connects the auxiliary heat exchanging device in parallel with the evaporator to form two evaporation heat exchanging branches during a start-up phase of the heat pump drying system;
and/or the number of the groups of groups,
when the heat pump drying system operates in a temperature regulation mode, the switching assembly connects the auxiliary heat exchange device and the condenser in parallel to form two condensation heat exchange branches.
12. A control method of a heat pump drying system, characterized in that the heat pump drying system comprises the heat pump system according to claim 8 or 9, and further comprises a circulation channel for circulating a circulating working medium in a space to be dried, the evaporator and the condenser are both arranged in the circulation channel, and the auxiliary heat exchange device is arranged outside the circulation channel;
the heat pump drying system has a temperature regulation mode,
the control method comprises the following steps:
and when the heat pump drying system operates in a temperature regulation mode, the sixth branch is closed, the fifth branch is opened, and the temperature regulation is performed by controlling the opening degrees of the first throttling element and the second throttling element.
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| CN106958888A (en) * | 2016-01-11 | 2017-07-18 | 北京索兰环益科技有限公司 | A kind of improved air source heat pump solid absorption dehumidifier |
| CN109405422A (en) * | 2018-11-30 | 2019-03-01 | 江苏天舒电器有限公司 | A kind of vacuum environment heat pump drying system and its working method |
| CN110590112A (en) * | 2019-08-30 | 2019-12-20 | 广东申菱环境系统股份有限公司 | Air-cooled closed sludge drying system and temperature control method thereof |
| CN110487064B (en) * | 2019-09-20 | 2020-06-19 | 河南科技大学 | Heat pump drying device |
| CN112880227B (en) * | 2021-01-25 | 2021-11-30 | 江苏永信医疗科技有限公司 | Cold and heat source supply system for whole year in special technological environment of hospital and operation method thereof |
| CN115289827B (en) * | 2022-07-19 | 2023-09-22 | 康特(苏州)能源环境设备有限公司 | Closed type zero-wet-emission efficient heat pump drying device and drying method |
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