CN107560230B - 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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- 238000001035 drying Methods 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000003507 refrigerant Substances 0.000 claims abstract description 78
- 230000009471 action Effects 0.000 claims abstract description 16
- 230000033228 biological regulation Effects 0.000 claims description 12
- 230000008569 process Effects 0.000 abstract description 8
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- 239000003570 air Substances 0.000 description 31
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- 230000001105 regulatory effect Effects 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 239000012080 ambient air Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
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Abstract
The application provides a heat pump system, a heat pump drying system and a control method thereof. The heat pump system comprises a heat pump system, wherein a refrigerant flow path of the heat pump system is provided with a compressor, a condenser, a throttling element and an evaporator, and is further provided with an auxiliary heat exchange device and a switching assembly, wherein the auxiliary heat exchange device can be selectively connected into a pipeline between an exhaust port of the compressor and a refrigerant inlet of the throttling element or a pipeline between a refrigerant outlet of the throttling element and an air suction port of the compressor under the action of the switching assembly. 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 solve the problems of slow starting process and incapability of temperature adjustment of the system at the same time through the same auxiliary heat exchange device when the auxiliary heat exchange device is applied to a heat pump drying system, and has the advantages of simple structure and system cost reduction.
Description
Technical Field
The application 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 application 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 application adopts the following technical scheme:
a heat pump system is provided with a compressor, a condenser, a throttling element and an evaporator on a refrigerant flow path of the heat pump system, and is further provided with an auxiliary heat exchange device and a switching assembly, wherein the auxiliary heat exchange device can be selectively connected into a pipeline between an exhaust port of the compressor and a refrigerant inlet of the throttling element or a pipeline between a refrigerant outlet of the throttling element and an air suction port of the compressor under the action of the switching assembly.
Preferably, the auxiliary heat exchange device can be connected in series with the condenser and the evaporator.
Preferably, the auxiliary heat exchange device can be connected into a pipeline between the exhaust port of the compressor and the refrigerant inlet of the condenser under the action of the switching assembly; and/or the number of the groups of groups,
the auxiliary heat exchange device can be connected into a pipeline between the refrigerant outlet of the throttling element and the refrigerant inlet of the evaporator under the action of the switching component.
Preferably, a first bypass branch is further arranged and connected with the condenser in parallel, and a first switch is arranged on the first bypass branch;
and/or the number of the groups of groups,
the evaporator is also provided with a second bypass branch connected with the evaporator in parallel, and a second switch is arranged on the second bypass branch;
and/or the number of the groups of groups,
the heat exchange device is characterized by further comprising a third bypass branch connected with the auxiliary heat exchange device in parallel, and a third switch is arranged on the third bypass branch.
Preferably, the switching assembly comprises a first four-way valve and a one-way valve set, wherein,
the first valve port of the first four-way valve is connected with the air suction port of the compressor, the second valve port is connected with the air discharge port of the compressor, and the third valve port is connected with the first port of the auxiliary heat exchange device;
the check valve group comprises a first check valve, a second check valve, a third check valve and a fourth check valve, wherein the inlet end of the first check valve and the outlet end of the fourth check valve are connected with the second port of the auxiliary heat exchange device, the outlet ends of the first check valve and the second check valve are connected with the refrigerant inlet of the condenser, the inlet end of the second check valve and the outlet end of the third check valve are connected with the fourth valve port of the first four-way valve, and the inlet ends of the third check valve and the fourth check valve are connected with the refrigerant outlet of the evaporator.
Preferably, a fourth switch is arranged on a connecting pipeline between a fourth port of the first four-way valve and an outlet end of the third one-way valve and an inlet end of the second one-way valve;
and/or the number of the groups of groups,
a fifth switch is arranged on a connecting pipeline between the second port of the auxiliary heat exchange device and the outlet end of the fourth one-way valve and between the second port of the auxiliary heat exchange device and the inlet end of the first one-way valve;
and/or the number of the groups of groups,
a sixth switch is arranged on a connecting pipeline between the refrigerant outlet of the evaporator and the inlet ends of the third check valve and the fourth check valve;
and/or the number of the groups of groups,
a seventh switch is arranged between the outlet ends of the first check valve and the second check valve and the inlet end of the condenser.
Preferably, the switching assembly comprises a first four-way valve and a second four-way valve, wherein,
the first valve port of the first four-way valve is connected with the air suction port of the compressor, the second valve port is connected with the air discharge port of the compressor, the third valve port is connected with the first port of the auxiliary heat exchange device, and the fourth valve port is connected with the third port of the second four-way valve;
the first port of the second four-way valve is connected with the refrigerant inlet of the condenser, the second port of the second four-way valve is connected with the refrigerant outlet of the evaporator, and the fourth port of the second four-way valve is connected with the second port of the auxiliary heat exchange device.
On the other hand, the application 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 application 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 adjustment mode and a normal drying mode, the switching assembly switching the auxiliary heat exchange device into a line between a refrigerant outlet of the throttling element and an air suction port of the compressor 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 between the exhaust port of the compressor and the refrigerant inlet of the throttling element.
Preferably, a first bypass branch is connected to the condenser in parallel, and a first switch is arranged on the first bypass branch, and when the heat pump drying system operates in a temperature regulation mode, temperature regulation is performed by controlling the first switch to be turned on and off;
and/or the number of the groups of groups,
the evaporator is connected with a second bypass branch in parallel, a second switch is arranged on the second bypass branch, and the second switch is opened in the starting stage of the heat pump drying system;
and/or the number of the groups of groups,
and a third bypass branch is connected to the auxiliary heat exchange device in parallel, and a third switch is arranged on the third bypass branch and is in an open state when the heat pump drying system operates in a normal drying mode.
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 solve the problems of slow starting process and incapability of temperature adjustment of the system at the same time through the same auxiliary heat exchange device when the auxiliary heat exchange device is applied to a heat pump drying system, and has the advantages of simple structure and system cost reduction.
Drawings
The above and other objects, features and advantages of the present application will become more apparent from the following description of embodiments of the present application 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 application;
FIG. 2 shows a second schematic diagram of a heat pump drying system according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a heat pump drying system according to a third embodiment of the present application;
fig. 4 shows a fourth schematic structural diagram of a heat pump drying system according to an embodiment of the present application.
In the figure, 1, a compressor; 2. a condenser; 3. a throttle element; 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 bypass branch; 111. a first electromagnetic valve; 12. a second bypass branch; 121. a second electromagnetic valve; 13. a third bypass branch; 131. a third electromagnetic valve; 14. a first four-way valve; 151. a first one-way valve; 152. a second one-way valve; 153. a third one-way valve; 154. a fourth one-way valve; 16. a fifth check valve; 17. a second four-way valve; 18. a large valve; 19. a small valve; 20. a large valve; 21. a small valve.
Detailed Description
The present application 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 a compressor 1, a condenser 2, a throttling element 3 and an evaporator 4 are arranged on a refrigerant flow path of the heat pump system, wherein the throttling element 3 can be an electronic expansion valve, for example, or can be other structures capable of playing a role in throttling, and the compressor 1, the condenser 2, the throttling element 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 9 can be selectively connected into a pipeline between the exhaust port of the compressor 1 and the refrigerant inlet of the throttling element 3 to serve as an auxiliary condenser, and connected into a pipeline between the refrigerant outlet of the throttling element 3 and the air suction port of the compressor 1 to serve as an auxiliary evaporator under the action of the switching assembly.
The auxiliary heat exchange device 9 is arranged outside the circulating air duct 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 that 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 into a pipeline between a refrigerant outlet of the throttling element 3 and an air suction port of the compressor 1, thereby using the auxiliary heat exchange device 9 as an auxiliary evaporator, the heat pump system can absorb external heat by the auxiliary heat exchange device 9 serving as the auxiliary evaporator to heat the circulating working medium in the circulating air duct 5, thereby accelerating a starting process, and particularly, as the refrigerant in the auxiliary heat exchange device 9 serving as the auxiliary evaporator is in a low-temperature low-pressure state, the low-temperature low-pressure 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 then enters the condenser 2, thereby transmitting the absorbed external heat to the circulating air duct 5 through the condenser 2, thereby accelerating the temperature rising speed of the circulating working medium in the circulating air duct 5.
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 into a pipeline between the exhaust port of the compressor 1 and the refrigerant inlet of the throttling element 3, 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 the external ambient air through the auxiliary heat exchange device 9 used as the auxiliary condenser, thereby achieving the purpose of temperature regulation. 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 to the refrigerant circulation circuit of the heat pump system, the auxiliary heat exchange device 9 may be connected in series with the condenser 2 and the evaporator 4, or may be connected in parallel.
When the auxiliary heat exchange device 9 is connected in series with the condenser 2 and the evaporator 4, preferably, in the start-up stage of the heat pump drying system, the auxiliary conversion device 9 is connected into a pipeline between the refrigerant outlet of the throttling element 3 and the refrigerant inlet of the evaporator 4 under the action of the switching component, so that the refrigerant throttled by the throttling element 3 firstly enters the auxiliary heat exchange device 9 to exchange heat, thereby increasing the heat absorbed by the auxiliary heat exchange device 9 from the outside, and further improving the start-up speed of the system. Similarly, when the heat pump drying system is in a temperature regulation mode, the auxiliary conversion device 9 is connected between the exhaust port of the compressor 1 and the refrigerant inlet of the condenser 2 under the action of the switching component, so that the refrigerant compressed by the compressor 1 firstly enters the auxiliary heat exchange device 9 to exchange heat, the heat released by the auxiliary heat exchange device 9 to the outside is increased, and the temperature regulation speed of the system is further improved.
In an alternative or more preferred embodiment, the condenser 2 is connected in parallel with the first bypass branch 11, that is, the condenser 2 is connected in parallel with the first bypass branch 11, and the first bypass branch 11 is provided with a first switch, which may be, for example, a first solenoid valve 111 shown in fig. 1, and when the heat pump drying system operates in a temperature adjustment mode, the opening and closing of the first solenoid valve 111 may be controlled to perform temperature adjustment, specifically, the refrigerant may be selected according to a temperature control requirement to pass through the condenser 2 (the first solenoid valve 111 is closed) or pass through the condenser 2 and the first bypass branch 11 simultaneously (the first solenoid valve 111 is opened), so that the temperature of the circulating working medium is adjusted, that is, when the refrigerant passes through the condenser 2, a part of the refrigerant exchanges heat with the circulating working medium in the condenser 2, and when the refrigerant passes through the first bypass branch 11 simultaneously, most of the refrigerant enters the auxiliary heat exchange device 9 through the first bypass branch 11 to perform heat release, and when the heat exchange with the circulating working medium is small.
The evaporator 4 is connected in parallel with the second bypass branch 12, that is, the evaporator 4 is connected with the second bypass branch 12 in parallel, the second bypass branch 12 is provided with a second switch, for example, the second switch may be a second electromagnetic valve 121 shown in fig. 1, in the starting stage of the heat pump drying system, the second electromagnetic valve 121 is opened, only a small part of refrigerant enters the evaporator 4, and most of refrigerant absorbs heat in the auxiliary heat exchange device 9, so that the starting speed of the system is further improved.
The auxiliary heat exchange device 9 is connected in parallel with a third bypass branch 13, that is, the auxiliary heat exchange device 9 is connected with the third bypass branch 13 in parallel, a third switch is arranged on the third bypass branch 13, and the third switch can be, for example, a third electromagnetic valve 131 shown in fig. 1, and when the heat pump drying system operates in a normal drying mode, the third electromagnetic valve 131 is in an open state, so that the flow resistance of a refrigerant is reduced, and the energy efficiency of the system is ensured.
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 four-way valve 14 and a one-way valve group, wherein a first port of the first four-way valve 14 is connected to the suction port of the compressor 1, a second port is connected to the discharge port of the compressor 1, and a third port is connected to the first port of the auxiliary heat exchanging device 9. The check valve group comprises a first check valve 151, a second check valve 152, a third check valve 153 and a fourth check valve 154, wherein the inlet end of the first check valve 151 and the outlet end of the fourth check valve 154 are connected with the second port of the auxiliary heat exchange device 9, the outlet ends of the first check valve 151 and the second check valve 152 are connected with the refrigerant inlet of the condenser 2, the inlet end of the second check valve 152 and the outlet end of the third check valve 153 are connected with the fourth valve port of the first four-way valve 14, and the inlet ends of the third check valve 153 and the fourth check valve 154 are connected with the refrigerant outlet of the evaporator 4. The first four-way valve 14 is configured such that, when powered on, the first port is in communication with the interior of the third port, the second port is in communication with the interior of the fourth port, and when powered off, the first port is in communication with the interior of the fourth port, and the second port is in communication with the interior of the third port. Preferably, in order to avoid the backflow of the refrigerant in the third bypass branch 13, a fifth check valve 16 is provided in the third bypass branch 13, and the fifth check valve 16 allows the refrigerant to flow only from the second port to the first port of the auxiliary heat exchange device 9. It will be appreciated that the fifth one-way valve 16 may also be replaced by a switch.
The heat pump drying system has a temperature adjusting mode and a normal drying mode, and the control method of the heat pump drying system shown in fig. 1 includes:
in the start-up phase of the heat pump drying system, the first four-way valve 14 is powered on, the second electromagnetic valve 121 is opened, the first electromagnetic valve 111 and the third electromagnetic valve 131 are closed, 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 evaporator 4 is bypassed by the second bypass branch 12, so that only a small amount of refrigerant passes through the evaporator 4, and most of refrigerant enters the auxiliary heat exchange device 9 through the second bypass branch 12 to exchange heat, 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 the preset temperature as soon as possible, and the starting process of the heat pump drying system is completed.
When the heat pump drying system operates in the normal drying mode, the first four-way valve 14 is powered on, the third electromagnetic valve 131 is opened, the first electromagnetic valve 111 and the second electromagnetic valve 121 are closed, and the flow route of the refrigerant is as follows:
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 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.
Since the third electromagnetic valve 131 is opened, the auxiliary heat exchange device 9 is bypassed by the third bypass branch 13, and most of the low-pressure refrigerant from the evaporator 4 passes through the third bypass branch 13 and returns to the compressor 1, thereby reducing the resistance of refrigerant flow.
When the heat pump drying system is in the temperature regulation mode, the first four-way valve 14 is not electrified, the second electromagnetic valve 121 is closed, and the third electromagnetic valve 131 can be opened or closed due to the fifth one-way valve 16 arranged on the third bypass branch 13, so that the temperature regulation is performed by controlling the opening and closing of the first electromagnetic valve 111.
When the first solenoid valve 111 is opened, the flow path of the refrigerant is:
when the first solenoid valve 111 is closed, the flow path of the refrigerant is:
compressor, first four-way valve, auxiliary heat exchange device, first one-way valve, condenser, throttling element, evaporator, third one-way valve (fourth one-way valve is non-conductive due to reverse pressure difference), first four-way valve and compressor
In this mode, the auxiliary heat exchange device 9 is used as an auxiliary condenser, and is in a state of being connected in series with the condenser 2, and the heat pump system releases excessive heat to the external ambient air through the auxiliary heat exchange device 9, and selects whether the refrigerant passes through the condenser 2 (the first electromagnetic valve 111 is closed) or passes through the condenser 2 and the first bypass branch 11 simultaneously (the first electromagnetic valve 111 is opened) according to the temperature control requirement, so that the temperature of the circulating working medium is adjusted.
Further, as shown in fig. 2, a fourth switch, for example, a large valve 18, may be disposed on a connection line between the fourth port of the first four-way valve 14 and the outlet end of the third one-way valve 153, and the inlet end of the second one-way valve 152, and a fifth switch, for example, a small valve 19, may be disposed on a connection line between the second port of the auxiliary heat exchange device 9 and the outlet end of the fourth one-way valve 154, and the inlet end of the first one-way valve 151, where the large valve 18 and the small valve 19 are disposed to close the refrigerant flow path during installation of the apparatus, thereby facilitating installation of the apparatus. Alternatively, as shown in fig. 3, a sixth switch, for example, a large valve 20 is provided on the connection line between the refrigerant outlet of the evaporator 4 and the inlet ends of the third and fourth check valves 153 and 154, and a seventh switch, for example, a small valve 21 is provided between the outlet ends of the first and second check valves 151 and 152 and the inlet end of the condenser 2.
In another embodiment, as shown in fig. 4, the check valve set may be replaced by a second four-way valve 17, that is, the switching assembly includes a first four-way valve 14 and a second four-way valve 17, where a first port of the first four-way valve 14 is connected to the air intake of the compressor 1, a second port is connected to the air exhaust of the compressor 1, a third port is connected to the first port of the auxiliary heat exchange device 9, and a fourth port is connected to the third port of the second four-way valve 17; the first port of the second four-way valve 17 is connected with the refrigerant inlet of the condenser 2, the second port is connected with the refrigerant outlet of the evaporator 4, and the fourth port is connected with the second port of the auxiliary heat exchange device 9. The first four-way valve 14 is configured such that, when powered on, the first port is in communication with the interior of the third port, the second port is in communication with the interior of the fourth port, and when powered off, the first port is in communication with the interior of the fourth port, and the second port is in communication with the interior of the third port. The second four-way valve 17 is configured such that, when powered on, the first port is in communication with the interior of the third port, the second port is in communication with the interior of the fourth port, and when powered off, the first port is in communication with the interior of the fourth port, and the second port is in communication with the interior of the third port.
The control method of the heat pump drying system shown in fig. 4 includes:
in the starting stage of the heat pump drying system, the first four-way valve 14 and the second four-way valve 17 are powered on, the second electromagnetic valve 121 is opened, the first electromagnetic valve 111 and the third electromagnetic valve 131 are closed, and the flow route of the refrigerant is as follows:
when the heat pump drying system operates in the normal drying mode, the first four-way valve 14 and the second four-way valve 17 are powered on, the third electromagnetic valve 131 is opened, the first electromagnetic valve 111 and the second electromagnetic valve 121 are closed, and the flow route of the refrigerant is as follows:
when the heat pump drying system operates in the temperature regulation mode, the first four-way valve 14 and the second four-way valve 17 are not electrified, the second electromagnetic valve 121 is closed, and the third electromagnetic valve 131 can be opened or closed due to the fact that the fifth one-way valve 16 is arranged on the third bypass branch 13, and temperature regulation is performed by controlling the opening and closing of the first electromagnetic valve 111.
When the first solenoid valve 111 is opened, the flow path of the refrigerant is:
when the first solenoid valve 111 is closed, the flow path of the refrigerant is:
compressor, first four-way valve, auxiliary heat exchange device, second four-way valve, condenser, throttling element, evaporator, second four-way valve, first four-way valve and compressor
The flow process and heat exchange principle of the refrigerant in the drying heat pump system shown in fig. 4 in different mode states are similar to those of the drying heat pump system shown in fig. 1, and will not be described again here.
The auxiliary heat exchange device 9 can be selectively connected with the evaporator 4 or the condenser 2 in parallel under the action of the switching component, and the parallel connection mode can reduce the flow resistance of the refrigerant and increase the energy efficiency of the system. Similarly to the series connection, the requirement for changing the connection position of the auxiliary heat exchanging device 9 can be satisfied by providing a combination of switching elements such as a two-way valve, a three-way valve, a four-way valve, a one-way valve, etc., so that the auxiliary heat exchanging device 9 is connected in parallel with the evaporator 4 as an auxiliary evaporator in the start-up phase of the heat pump drying system, and the auxiliary heat exchanging device 9 is connected in parallel with the condenser 2 as an auxiliary condenser in the temperature adjustment mode of the heat pump drying system.
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 application and is not intended to limit the present application, and various modifications and variations may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (9)
1. The heat pump system is characterized by further comprising an auxiliary heat exchange device and a switching assembly, wherein the auxiliary heat exchange device can be selectively connected into a pipeline between an exhaust port of the compressor and a refrigerant inlet of the throttling element or a pipeline between a refrigerant outlet of the throttling element and an air suction port of the compressor under the action of the switching assembly, the condenser and the evaporator are both arranged in a circulating air channel, the auxiliary heat exchange device is arranged outside the circulating air channel, an air inlet and an air outlet of the circulating air channel are both communicated with a space to be dried, an inner fan is further arranged in the circulating air channel, and an outer fan is arranged on one side of the auxiliary heat exchange device;
the switching assembly comprises a first four-way valve and a one-way valve group, wherein,
the first valve port of the first four-way valve is connected with the air suction port of the compressor, the second valve port is connected with the air discharge port of the compressor, and the third valve port is connected with the first port of the auxiliary heat exchange device;
the check valve group comprises a first check valve, a second check valve, a third check valve and a fourth check valve, wherein the inlet end of the first check valve and the outlet end of the fourth check valve are connected with the second port of the auxiliary heat exchange device, the outlet ends of the first check valve and the second check valve are connected with the refrigerant inlet of the condenser, the inlet end of the second check valve and the outlet end of the third check valve are connected with the fourth valve port of the first four-way valve, and the inlet ends of the third check valve and the fourth check valve are connected with the refrigerant outlet of the evaporator.
2. The heat pump system of claim 1, wherein the auxiliary heat exchange device is configured to be coupled in series with the condenser and the evaporator.
3. The heat pump system of claim 1, wherein the auxiliary heat exchange device is capable of being accessed into a conduit between a discharge port of the compressor and a refrigerant inlet of the condenser under the action of the switching assembly; and/or the number of the groups of groups,
the auxiliary heat exchange device can be connected into a pipeline between the refrigerant outlet of the throttling element and the refrigerant inlet of the evaporator under the action of the switching component.
4. A heat pump system according to any one of claims 1 to 3, further comprising a first bypass branch connected in parallel with the condenser, the first bypass branch being provided with a first switch;
and/or the number of the groups of groups,
the evaporator is also provided with a second bypass branch connected with the evaporator in parallel, and a second switch is arranged on the second bypass branch;
and/or the number of the groups of groups,
the heat exchange device is characterized by further comprising a third bypass branch connected with the auxiliary heat exchange device in parallel, and a third switch is arranged on the third bypass branch.
5. The heat pump system of claim 1, wherein a fourth switch is provided on a connection line between a fourth port of the first four-way valve and an outlet port of the third one-way valve, an inlet port of the second one-way valve;
and/or the number of the groups of groups,
a fifth switch is arranged on a connecting pipeline between the second port of the auxiliary heat exchange device and the outlet end of the fourth one-way valve and between the second port of the auxiliary heat exchange device and the inlet end of the first one-way valve;
and/or the number of the groups of groups,
a sixth switch is arranged on a connecting pipeline between the refrigerant outlet of the evaporator and the inlet ends of the third check valve and the fourth check valve;
and/or the number of the groups of groups,
a seventh switch is arranged between the outlet ends of the first check valve and the second check valve and the inlet end of the condenser.
6. A heat pump system according to any one of claims 1 to 3, wherein the switching assembly comprises a first four-way valve and a second four-way valve, wherein,
the first valve port of the first four-way valve is connected with the air suction port of the compressor, the second valve port is connected with the air discharge port of the compressor, the third valve port is connected with the first port of the auxiliary heat exchange device, and the fourth valve port is connected with the third port of the second four-way valve;
the first port of the second four-way valve is connected with the refrigerant inlet of the condenser, the second port of the second four-way valve is connected with the refrigerant outlet of the evaporator, and the fourth port of the second four-way valve is connected with the second port of the auxiliary heat exchange device.
7. A heat pump drying system, characterized by comprising the heat pump system according to any one of claims 1 to 6, and 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 arranged in the circulation channel, the auxiliary heat exchange device is arranged outside the circulation channel, an air inlet and an air outlet of the circulation channel are both communicated with the space to be dried, an inner fan is further arranged in the circulation channel, and an outer fan is arranged on one side of the auxiliary heat exchange device.
8. A control method of a heat pump drying system according to claim 7, wherein the heat pump drying system has a temperature adjusting mode and a normal drying mode,
in the starting stage of the heat pump drying system, the switching component connects the auxiliary heat exchange device into a pipeline between a refrigerant outlet of the throttling element and an air suction port of the compressor;
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 between the exhaust port of the compressor and the refrigerant inlet of the throttling element.
9. The control method according to claim 8, wherein a first bypass branch is connected in parallel to the condenser, a first switch is provided on the first bypass branch, and when the heat pump drying system operates in a temperature adjustment mode, temperature adjustment is performed by controlling opening and closing of the first switch;
and/or the number of the groups of groups,
the evaporator is connected with a second bypass branch in parallel, a second switch is arranged on the second bypass branch, and the second switch is opened in the starting stage of the heat pump drying system;
and/or the number of the groups of groups,
and a third bypass branch is connected to the auxiliary heat exchange device in parallel, and a third switch is arranged on the third bypass branch and is in an open state when the heat pump drying system operates in a normal drying mode.
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| CN108679716B (en) * | 2018-05-28 | 2024-04-26 | 特灵空调系统(中国)有限公司 | Heat exchange system |
| CN113566380A (en) * | 2020-04-29 | 2021-10-29 | 宁波奥克斯电气股份有限公司 | Compressor heat dissipation device and method and air conditioner |
| 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 |
| CN115574492A (en) * | 2022-10-09 | 2023-01-06 | 广东美的白色家电技术创新中心有限公司 | Heat exchange system and heat pump equipment |
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