CN114508877B - Two-stage throttling device, control method, control device, refrigerating unit and medium - Google Patents
Two-stage throttling device, control method, control device, refrigerating unit and medium Download PDFInfo
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- CN114508877B CN114508877B CN202111232237.9A CN202111232237A CN114508877B CN 114508877 B CN114508877 B CN 114508877B CN 202111232237 A CN202111232237 A CN 202111232237A CN 114508877 B CN114508877 B CN 114508877B
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- 238000000034 method Methods 0.000 title claims abstract description 52
- 238000004781 supercooling Methods 0.000 claims abstract description 157
- 238000005057 refrigeration Methods 0.000 claims abstract description 46
- 239000003507 refrigerant Substances 0.000 claims abstract description 35
- 239000007788 liquid Substances 0.000 claims description 20
- 239000011555 saturated liquid Substances 0.000 claims description 18
- 238000003860 storage Methods 0.000 claims description 10
- 238000004590 computer program Methods 0.000 claims description 6
- 239000013526 supercooled liquid Substances 0.000 claims description 5
- 230000006870 function Effects 0.000 description 16
- 230000001276 controlling effect Effects 0.000 description 13
- 238000010586 diagram Methods 0.000 description 8
- 238000001704 evaporation Methods 0.000 description 6
- 230000001105 regulatory effect Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 3
- 230000001960 triggered effect Effects 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000011552 falling film Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
- F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
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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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/37—Capillary tubes
-
- 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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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The application provides a two-stage throttling device, a control method, a control device, a refrigerating unit and a medium; a two-stage throttling device for use in a refrigeration system or unit, the two-stage throttling device comprising: a primary throttling device, a secondary throttling device and a connecting device; the first throttling device is communicated with the second throttling device through the connecting device; the primary throttling device is an electric throttling device capable of adjusting flow, and is arranged on a main unit part of the refrigerating unit with a control box; the secondary throttling device is an electric throttling device with adjustable flow or a mechanical throttling device with non-adjustable flow, and is arranged on the side close to the inlet of the evaporator in the refrigerating unit; when the distance between the two-stage throttling device and the evaporator is too large, the embodiment of the application can still ensure enough supercooling degree, and reduce the refrigerant gas entering the evaporator, thereby ensuring the heat exchange efficiency of the evaporator and being more convenient to control.
Description
Technical Field
The application relates to the field of refrigerating units, in particular to a two-stage throttling device, a control method, a control device, a refrigerating unit and a medium.
Background
The working principle of the throttling device is that the flow section is partially contracted when the refrigerant flows through the valve, so that the flow speed of fluid is increased, the static pressure is reduced, and a pressure difference is generated before and after the throttling device.
The function of the throttling device in the refrigeration system: (1), throttling and depressurization: the medium-temperature high-pressure refrigerant liquid from the condenser is throttled, the pressure and the temperature of the medium-temperature high-pressure refrigerant liquid are reduced, the medium-temperature high-pressure refrigerant liquid becomes wet steam with lower saturation temperature, conditions are provided for boiling and evaporation of the refrigerant in the evaporator, and a high-low pressure difference environment of the refrigeration system is established. (2) regulating the flow: the throttle valve device with the adjusting function can adjust the flow rate of the refrigerant entering the evaporator by controlling the opening degree of the valve so as to be matched with the heat load of the evaporator. (2) controlling the superheat degree: the throttle valve device with the adjusting function has the function of controlling the superheat degree of the refrigerant at the outlet of the evaporator. The set superheat value is ensured, the heat transfer area of the evaporator can be fully utilized, and the suction liquid of the compressor can be prevented.
If the liquid supply amount of the throttle device to the evaporator is too large as compared with the evaporation load, the refrigerant cannot be completely evaporated in the evaporator, and a part of the liquid refrigerant is sucked into the compressor, resulting in wet compression. If the liquid supply amount is too small compared with the load of the evaporator, the heat transfer area of the evaporator part cannot fully exert the efficiency, so that the waste is caused, the evaporation pressure is reduced, the refrigerating capacity of the refrigerating system is reduced, the refrigerating coefficient is reduced, and the energy consumption of the refrigerating device is increased. The flow regulation of the throttling device plays a very important role in energy conservation and consumption reduction of the refrigerating device.
Current throttle devices in some scenarios result in too great a distance between the throttle device and the evaporator due to structural or layout limitations. At this time, a large pressure drop is generated due to overlong pipelines, and the refrigerant in the pipeline from the throttle valve to the evaporator is seriously flashed, so that a large amount of refrigerant gas enters the evaporator to influence the heat exchange efficiency.
Disclosure of Invention
The application provides a two-stage throttling device, a control method, a control device, a refrigerating unit and a medium, and aims to solve the technical problem that when the distance between the existing throttling device and an evaporator is too large, a large pressure drop is easily generated due to overlong pipelines to influence heat exchange efficiency.
In one aspect, the present application provides a two-stage throttling device for use in a refrigeration unit, the two-stage throttling device comprising:
A first-stage throttling device,
Two-stage throttle device
The connecting device is a pipeline part between the primary throttling device and the secondary throttling device;
the first throttling device is communicated with the second throttling device through the connecting device;
The primary throttling device is an electric throttling device capable of adjusting flow, and is arranged on a main unit part of the refrigerating unit with a control box;
The secondary throttling device is an electric throttling device with adjustable flow or a mechanical throttling device with non-adjustable flow, and the secondary throttling device is arranged on the inlet side close to the evaporator in the refrigerating unit.
In some embodiments of the application, the two-stage throttling device comprises:
the first-stage throttling device is any one of an electronic expansion valve and a thermal expansion valve;
The secondary throttling device is any one of an electronic expansion valve, a thermal expansion valve, a throttling orifice plate and a capillary plate.
In one aspect, the present application provides a control method of a two-stage throttle device for controlling a two-stage throttle device as described above,
The control method of the two-stage throttling device comprises the following steps:
Acquiring an intermediate supercooling degree and a preset target supercooling degree, wherein the intermediate supercooling degree is the supercooling degree measured on a pipeline between the two stages of throttling devices;
and adjusting the opening of the primary throttling device and/or the opening of the secondary throttling device in real time according to the actual value of the intermediate supercooling degree and the difference value of the target supercooling degree so as to change the first pressure drop corresponding to the primary throttling device and/or the second pressure drop corresponding to the secondary throttling device.
In the present embodiment, the intermediate point (the state point of the refrigerant between the two-stage throttles) is located away from or near the saturated liquid line by the control of the two-stage throttles, so that the supercooling degree of the intermediate point becomes large or small.
In some embodiments of the application, the opening degree of the primary throttling device is adjusted according to the difference value between the intermediate supercooling degree and the target supercooling degree; the opening degree of the secondary throttling device is adjusted according to the flow demand of the evaporator, and the method comprises the following steps:
Comparing the intermediate subcooling degree with the target subcooling degree;
If the intermediate supercooling degree is smaller than the target supercooling degree, increasing the opening corresponding to the first-stage throttling device, and reducing the first pressure drop corresponding to the first-stage throttling device, so that the intermediate point is far away from the saturated liquid line, and the intermediate supercooling degree is increased; acquiring the required flow of the evaporator, and adjusting the opening of the secondary throttling device according to the required flow of the evaporator;
If the intermediate supercooling degree is larger than the target supercooling degree, reducing the opening corresponding to the first-stage throttling device, and increasing the first pressure drop corresponding to the first-stage throttling device, so that the intermediate point is close to a saturated liquid line, and the intermediate supercooling degree is reduced; and obtaining the required flow of the evaporator, and adjusting the opening of the secondary throttling device according to the required flow of the evaporator.
In some embodiments of the application, the opening degree of the secondary throttle device is adjusted according to the difference value between the intermediate supercooling degree and the target supercooling degree; the opening degree of the primary throttling device is adjusted according to the flow demand of the evaporator, and the method comprises the following steps:
Comparing the intermediate subcooling degree with the target subcooling degree;
If the intermediate supercooling degree is smaller than the target supercooling degree, reducing the opening corresponding to the secondary throttling device, and increasing the second pressure drop corresponding to the secondary throttling device, so that the intermediate point is far away from the saturated liquid line, and the intermediate supercooling degree is increased; acquiring the required flow of the evaporator, and adjusting the opening of the primary throttling device according to the required flow of the evaporator;
if the intermediate supercooling degree is larger than the target supercooling degree, increasing the opening corresponding to the secondary throttling device, and reducing the second pressure drop corresponding to the secondary throttling device, so that the intermediate point is close to the saturated liquid line, and the intermediate supercooling degree is reduced; and acquiring the required flow of the evaporator, and adjusting the opening of the primary throttling device according to the required flow of the evaporator.
In another aspect, the present application provides a control device for a two-stage throttle device, comprising:
The device comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring intermediate supercooling degree and preset target supercooling degree, and the intermediate supercooling degree is as follows: a degree of supercooling measured on a line between the two stages of throttling means;
and the adjusting module is used for adjusting the opening of the primary throttling device and/or the opening of the secondary throttling device according to the intermediate supercooling degree and the target supercooling degree so as to change the first pressure drop corresponding to the primary throttling device and/or the second pressure drop corresponding to the secondary throttling device.
In another aspect, the present application also provides a refrigeration unit, including:
one or more processors;
A memory; and
One or more applications, wherein the one or more applications are stored in the memory and configured to be executed by the processor to implement the steps of the control method of the two-stage throttle device.
In another aspect, the present application also provides a computer readable storage medium having stored thereon a computer program to be loaded by a processor for executing steps in the control method of the two-stage throttle device.
The technical scheme of the application discloses a two-stage throttling device, a control method, a control device, a refrigerating unit and a medium, wherein the two-stage throttling device is applied to the refrigerating unit or the system and comprises the following components: a primary throttling device, a secondary throttling device and a connecting device; the first throttling device is communicated with the second throttling device through the connecting device; the primary throttling device is an electric throttling device and is arranged on a main unit part of the refrigerating unit with the electric control box; the secondary throttling device is an electric throttling device or a mechanical throttling device, and the secondary throttling device is arranged on the side, close to the inlet of the evaporator, of the refrigerating unit.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic view of a control method of a two-stage throttle device according to an embodiment of the present application;
FIG. 2 is a flow chart of an embodiment of a method for controlling a two-stage throttle device according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a two-stage throttle device in a control method of the two-stage throttle device according to an embodiment of the present application;
FIG. 4 is a schematic diagram of an embodiment of a two-stage throttle adjustment principle in a control method of a two-stage throttle provided in an embodiment of the present application;
FIG. 5 is a schematic view of an exemplary scenario illustrating a position setting of a two-stage throttle device in a refrigeration unit according to a control method of the two-stage throttle device according to an embodiment of the present application;
FIG. 6 is a schematic diagram of an embodiment of a control device for a two-stage throttle device provided in an embodiment of the present application;
fig. 7 is a schematic structural view of an embodiment of a refrigeration unit provided in an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be encompassed by the present application.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or address relationships based on the orientations or address relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present application, the term "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described as "exemplary" in this disclosure is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the application. In the following description, details are set forth for purposes of explanation. It will be apparent to one of ordinary skill in the art that the present application may be practiced without these specific details. In other instances, well-known structures and processes have not been described in detail so as not to obscure the description of the application with unnecessary detail. Thus, the present application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.
The embodiment of the application provides a two-stage throttling device, a control method, a control device, a refrigerating unit and a medium, which are respectively described in detail below.
The control method of the two-stage throttling device in the embodiment of the invention is applied to the control device of the two-stage throttling device, the control device of the two-stage throttling device is arranged in a refrigerating unit, one or more processors, a memory and one or more application programs are arranged in the refrigerating unit, and one or more application programs are stored in the memory and configured to be executed by the processors to realize the control method of the two-stage throttling device.
As shown in fig. 1, fig. 1 is a schematic diagram of a scenario of a control method of a two-stage throttling device according to an embodiment of the present application, where a control scenario of the two-stage throttling device includes a refrigeration unit 100 (a control device of the two-stage throttling device is integrated in the refrigeration unit refrigeration system 100), and a computer readable storage medium corresponding to control of the two-stage throttling device is executed in the refrigeration unit 100, so as to execute a step of controlling the two-stage throttling device.
It should be understood that the refrigerating unit in the scenario of controlling the two-stage throttling device shown in fig. 1, or the device included in the refrigerating unit, does not limit the embodiment of the present invention, that is, the number of devices and the type of the refrigerating unit included in the scenario of controlling the two-stage throttling device, or the number of devices and the type of the device included in each device do not affect the overall implementation of the technical solution in the embodiment of the present invention, and all the devices and the type of the devices may be calculated as equivalent substitutions or derivatives of the technical solution claimed in the embodiment of the present invention.
The refrigerating unit 100 in the embodiment of the present invention is mainly used for: obtaining an intermediate supercooling degree and a preset target supercooling degree, wherein the intermediate supercooling degree is as follows: a degree of supercooling measured on a line between the two stages of throttling means; and adjusting the opening of the primary throttling device and/or the opening of the secondary throttling device according to the difference value of the intermediate supercooling degree and the target supercooling degree so as to change the first pressure drop corresponding to the primary throttling device and/or the second pressure drop corresponding to the secondary throttling device.
The refrigeration unit 100 in the embodiment of the present invention may be an independent refrigeration unit, or may be a refrigeration unit network or a refrigeration unit cluster formed by refrigeration units, for example, the refrigeration unit 100 described in the embodiment of the present invention includes, but is not limited to, a computer, a network host, a single network refrigeration unit, a plurality of network refrigeration units, or a cloud refrigeration unit formed by a plurality of refrigeration units. Wherein, cloud refrigerating units are composed of a large number of computers or network refrigerating units based on Cloud Computing (Cloud Computing).
It will be appreciated by those skilled in the art that the application environment shown in fig. 1 is merely an application scenario of the present application, and is not limited to the application scenario of the present application, and other application environments may further include more or fewer refrigeration units than those shown in fig. 1, or a network connection relationship of refrigeration units, for example, only 1 refrigeration unit is shown in fig. 1, and it will be appreciated that the scenario of controlling the two-stage throttling device may further include one or more other refrigeration units, which is not limited herein in particular; a memory may also be included in the refrigeration unit 100 for storing data.
In addition, in the scene of controlling the two-stage throttling device, the refrigerating unit 100 can be provided with a display device, or the refrigerating unit 100 is not provided with the display device which is in communication connection with the external display device 200, and the display device 200 is used for outputting the execution result of the control method of the two-stage throttling device in the refrigerating unit. The refrigeration unit 100 may access a background database 300 (the background database may be in a local memory of the refrigeration unit, and the background database may also be disposed in the cloud), where the background database 300 stores information related to control of the two-stage throttling device.
It should be noted that, the schematic view of the scenario of the control method of the two-stage throttling device shown in fig. 1 is only an example, and the scenario of the control of the two-stage throttling device described in the embodiment of the present invention is for more clearly describing the technical solution of the embodiment of the present invention, and does not constitute a limitation on the technical solution provided by the embodiment of the present invention.
Referring to fig. 2, fig. 2 is a flowchart illustrating an embodiment of a control method of a two-stage throttle device according to an embodiment of the present application. The control method of the two-stage throttling device of the embodiment comprises the following steps:
And 201, acquiring an intermediate supercooling degree and a preset target supercooling degree, wherein the intermediate supercooling degree is the supercooling degree measured on a pipeline between the two stages of throttling devices.
The control method of the two-stage throttling device in the embodiment is applied to a refrigerating unit, and the type of the refrigerating unit is not particularly limited, and for example, the refrigerating unit may be a split air conditioner.
The refrigerating unit generally adopts a single throttling device; in some scenarios, however, the distance between the throttle device and the evaporator is too large due to limitations in the structure or layout of the refrigeration unit. At this time, a large pressure drop is generated due to overlong pipelines, so that the refrigerant in the pipeline from the throttling device to the evaporator is seriously flashed, a large amount of refrigerant gas enters the evaporator, and the heat exchange efficiency is affected. In order to solve the disadvantages of the current throttling device, a two-stage throttling device is provided.
A two-stage throttling device for use in a refrigeration unit, the two-stage throttling device comprising: a primary throttling device, a secondary throttling device and a connecting device; the first throttling device is communicated with the second throttling device through the connecting device; the primary throttling device is an electric throttling device capable of adjusting flow, and is arranged on a unit main body part (an electric cabinet side) in the refrigerating unit; the secondary throttling device is an electric throttling device with adjustable flow or a mechanical throttling device with non-adjustable flow, and the secondary throttling device is arranged on the inlet side close to the evaporator in the refrigerating unit.
Specifically:
referring to fig. 3, fig. 3 is a schematic structural diagram of a two-stage throttle device in a control method of the two-stage throttle device according to an embodiment of the present application. The purpose of the two-stage throttle device in fig. 3 is to: when the distance between the throttling device and the evaporator is too large, enough supercooling degree can be ensured, the refrigerant gas entering the evaporator is reduced, the control is more convenient, and the heat exchange efficiency of the evaporator is improved.
With continued reference to fig. 3, the two-stage restriction device of the present embodiment is further connected in series with a first restriction member (hereinafter referred to as a primary restriction device) and then a second restriction member (hereinafter referred to as a secondary restriction device), wherein the second restriction member is positioned adjacent to the evaporator inlet.
In this embodiment, the separation type refrigerating unit has a unit evaporator part far away from the unit main body, and the electric appliance control center is generally disposed in the unit main body, so that if the secondary throttling is implemented by using the electrically controlled throttling component such as the electronic expansion valve, the wiring is too long, which causes many practical problems. For another example, an ice-making coil (the coil being an evaporator) requires the evaporator to be placed in water or other liquid. However, according to the design principle, the pipeline between the evaporator and the throttling component cannot be too long, and if the requirement is met, the secondary throttling device is necessarily soaked in the liquid. Therefore, the secondary throttling device cannot be an electronic expansion valve with electric control or a thermal expansion valve assembled by a plurality of parts, the waterproof performance of the device cannot be very good, and a certain risk exists; in this case, a capillary tube or an orifice plate is used as the secondary throttle device. According to different use occasions, the throttling components such as a capillary tube and a throttling orifice plate which do not need an electric connection device and can be soaked in liquid are selected as a secondary throttling device, and the throttling valves such as a thermal expansion valve and an electronic expansion valve which can adjust the flow rate are selected as a primary throttling device for adjusting the flow rate of the system.
When the two-stage throttling device is designed, two groups of throttling devices can have the adjusting function; one group of throttling devices can also have a flow regulating function (the opening degree is adjustable), the other group of throttling devices does not have a flow regulating function, and then the one-stage and two-stage combined integral throttling device also has the flow regulating function. The throttling device is adjusted according to the flow demand of the evaporator, and when the evaporator is a dry heat exchanger (the dry evaporator comprises, but is not limited to, a dry shell-and-tube heat exchanger, a fin type heat exchanger, a plate type heat exchanger, a sleeve type heat exchanger and the like), the throttling device is adjusted according to the superheat degree of the refrigerant at the outlet of the evaporator. When the evaporator is a flooded heat exchanger or a falling film heat exchanger, the throttling device adjusts the flow according to the liquid level (height) of the liquid refrigerant in the evaporator; in this case, the flow rate of the throttle device may be adjusted according to the degree of superheat of the compressor (the degree of superheat of the compressor indirectly reflects the degree of flow rate of the refrigerant on the evaporator side, the flow rate of the refrigerant entering the evaporator increases, the degree of superheat of the compressor decreases, and vice versa).
In addition, the primary throttling device and the secondary throttling device in the two-stage throttling device provided in the embodiment are taken as an example, and are flexibly set according to the application scene of the two-stage throttling device.
The design purpose of the two-stage throttling device in this embodiment is that after the high-pressure supercooled liquid refrigerant from the condenser is throttled and depressurized by the first-stage throttling device, the refrigerant is still in a pure liquid state (supercooled liquid or saturated liquid), and at this time, the refrigerant entering the second-stage throttling device can be ensured to be in a pure liquid state.
According to the embodiment of the application, the first-stage throttling device in the two-stage throttling device is conveniently controlled by adopting the electric throttling device, the second-stage throttling device in the two-stage throttling device is controlled by adopting the mechanical throttling device according to the required flow of the evaporator, so that when the distance between the two-stage throttling device and the evaporator is overlarge, the sufficient supercooling degree can be ensured, the refrigerant gas entering the evaporator is reduced, the flow requirement of the evaporator can be met, and the heat exchange efficiency of the evaporator is ensured.
After describing the two-stage throttle device in this embodiment, it is further described how to control the two-stage throttle device, specifically:
the refrigerating system of the refrigerating unit receives a throttling device adjustment request, wherein the triggering mode of the throttling device adjustment request is not particularly limited, that is, the throttling device adjustment request can be actively triggered by a user, for example, the user can manually adjust the opening of the throttling device, and actively trigger the throttling device adjustment request; in addition, the throttling device adjustment request may also be automatically triggered by the refrigeration unit, for example, the refrigeration unit acquires the current intermediate supercooling degree in real time, and when the actual value of the intermediate supercooling degree of the refrigeration unit is greater than or less than the preset target supercooling degree value, the throttling device adjustment request is automatically triggered.
The refrigerating unit obtains the intermediate supercooling degree and the preset target supercooling degree, and sends out a throttling device adjusting request when the intermediate supercooling degree is larger than or smaller than the preset target supercooling degree value. The intermediate supercooling degree is a supercooling degree measured on a pipe line between the two-stage throttling devices, and the target supercooling degree is a supercooling degree set according to the content and type of the refrigerant in the refrigerating system. The preset target supercooling degree refers to a preset supercooling degree of high-pressure supercooled liquid, and the preset target supercooling degree can be set according to a specific scene.
202, Adjusting the opening degree of the primary throttling device and/or the opening degree of the secondary throttling device in real time according to the actual value of the intermediate supercooling degree and the difference value of the target supercooling degree so as to change the first pressure drop corresponding to the primary throttling device and/or the second pressure drop corresponding to the secondary throttling device.
According to the intermediate supercooling degree and the target supercooling degree, the refrigerating unit adjusts the opening degree of the primary throttling device and/or the opening degree of the secondary throttling device so as to change the first pressure drop corresponding to the primary throttling device and/or the second pressure drop corresponding to the secondary throttling device, and in the embodiment, the primary throttling device and the secondary throttling device have adjusting capability, and the adjusting modes of the primary throttling device and the secondary throttling device are not limited, for example:
An implementation one, including:
(1) Comparing the intermediate subcooling degree with the target subcooling degree;
(2) If the intermediate supercooling degree is smaller than the target supercooling degree, increasing the opening corresponding to the first-stage throttling device, and reducing the first pressure drop corresponding to the first-stage throttling device, so that the intermediate point is far away from the saturated liquid line, and the intermediate supercooling degree is increased; acquiring the required flow of the evaporator, and adjusting the opening of the secondary throttling device according to the required flow of the evaporator;
(3) If the first supercooling degree is larger than the target supercooling degree, reducing the opening corresponding to the first-stage throttling device, and increasing the first pressure drop corresponding to the first-stage throttling device to enable the middle point to be close to a saturated liquid line, so that the middle supercooling degree is reduced; and obtaining the required flow of the evaporator, and adjusting the opening of the secondary throttling device according to the required flow of the evaporator.
In this embodiment, the intermediate supercooling degree is compared with the target supercooling degree, and according to the difference between the intermediate supercooling degree and the target supercooling degree, the opening corresponding to the primary throttling device is adjusted, and meanwhile, the opening of the secondary throttling device is adjusted according to the required flow in the evaporator, so that the primary throttling device and the secondary throttling device are adjusted according to different information, the adjustment speed is faster, and the heat exchange efficiency of the evaporator is higher.
The second specific implementation manner includes:
(1) Comparing the intermediate subcooling degree with the target subcooling degree;
(2) If the intermediate supercooling degree is smaller than the target supercooling degree, reducing the opening corresponding to the secondary throttling device, and increasing the second pressure drop corresponding to the secondary throttling device, so that the intermediate point is far away from the saturated liquid line, and the intermediate supercooling degree is increased; acquiring the required flow of the evaporator, and adjusting the opening of the primary throttling device according to the required flow of the evaporator;
(3) If the intermediate supercooling degree is larger than the target supercooling degree, increasing the opening corresponding to the secondary throttling device, and reducing the second pressure drop corresponding to the secondary throttling device, so that the intermediate point is close to a saturated liquid line, and the intermediate supercooling degree is reduced; and acquiring the required flow of the evaporator, and adjusting the opening of the primary throttling device according to the required flow of the evaporator.
In this embodiment, the intermediate supercooling degree is compared with the target supercooling degree, and according to the difference between the intermediate supercooling degree and the target supercooling degree, the opening corresponding to the second-stage throttling device is adjusted, and meanwhile, the opening of the first-stage throttling device is adjusted according to the required flow of the evaporator, so that the first-stage throttling device and the second-stage throttling device are adjusted according to different information, the adjustment speed is higher, and the heat exchange efficiency of the evaporator is higher.
For convenience of understanding, a control method of the two-stage throttling device is provided in this embodiment, specifically, referring to fig. 4, fig. 4 is a schematic diagram illustrating an embodiment of a two-stage throttling device adjustment principle in the control method of the two-stage throttling device provided in the embodiment of the present application, where a first pressure drop Δp1 of the one-stage throttling device, a second pressure drop Δp2 of the two-stage throttling device, and a supercooling degree of the high-pressure supercooled liquid correspond to a pressure drop Δp' (=a saturation pressure corresponding to a current pressure-a current temperature) in fig. 4. If the design requirement of the two-stage throttling device is to be met, namely the refrigerant throttled by the one-stage throttling device is still in a pure liquid state, the requirement of delta P1 is not more than delta P'.
Referring to fig. 4, the opening degree adjustment method of the entire throttle apparatus is as follows:
Scheme one: the first-stage throttling device adjusts the flow according to the supercooling degree of the refrigerant at the outlet of the first-stage throttling device, and when the supercooling degree is smaller than a supercooling degree target value, the opening degree of the valve is opened, and delta P1 is reduced; when the supercooling degree is larger than the supercooling degree target value, the opening degree of the valve is reduced, and delta P1 is increased; the secondary throttle device adjusts the flow according to the evaporator flow control target.
Scheme II: the secondary throttling device adjusts the flow according to the supercooling degree of the inlet refrigerant: when the supercooling degree is smaller than the supercooling degree target value, the opening degree of the valve is closed, and delta P2 is increased; when the supercooling degree is larger than the supercooling degree target value, opening the valve to reduce delta P2; the primary throttle device still adjusts the flow rate according to the evaporator flow control target.
In this embodiment, for some air conditioning units with a very large evaporation temperature variation range, for example, the air conditioning unit is a low-temperature heat pump unit, a low-temperature refrigerator unit, etc., referring to fig. 5, fig. 5 is a schematic diagram of an embodiment of a position setting of a two-stage throttling device in a refrigerator unit in the control method of the two-stage throttling device provided in the embodiment of the application; in fig. 5, the evaporating temperature is in direct proportion to the refrigerant circulation flow, and the evaporating temperature has a large range of variation, which means that the refrigerant flow has a large range of variation. In such an air conditioner unit, an extreme situation of very large or very small refrigerant circulation flow rate occurs, and if a single-stage throttle device is used as the adjustment means, the maximum opening degree or the minimum opening degree occurs, for example, when the opening degree reaches the minimum opening degree, the throttle device supply flow rate still exceeds the evaporator demand, which results in difficulty in adjustment of the throttle device and deterioration of the stability of adjustment. The above problem can be solved by adopting the two-stage throttle device in the present embodiment, so that the opening of the one-stage throttle device, which is adjusted in accordance with the evaporator flow control target, is within an adjustable range.
In this embodiment, when the secondary throttling device is a throttling device such as a throttling orifice plate, a capillary tube, and the like, which does not have a regulating function, a proper orifice plate size or capillary tube specification needs to be selected by means of theoretical calculation, and the like, and when the maximum pressure difference working condition (Δppmax) and the minimum pressure difference working condition (Δppmin) of the minimum guaranteed unit in the operation range are: the pressure drop of the secondary throttling device meets the requirement of delta P2 (delta P-delta P'), and then the rationality of the type-selection design is verified by a test, see FIG. 4. Therefore, the method can ensure that Δp2 is more than or equal to (Δp- Δp ') under all working conditions within the running range of the unit, so that Δp1 is less than or equal to Δp', and the refrigerant imported by the secondary throttling device is ensured to be in a pure liquid state.
In order to better implement the control method of the two-stage throttling device in the embodiment of the application, the embodiment of the application also provides a control device of the two-stage throttling device on the basis of the control method of the two-stage throttling device.
FIG. 6 is a schematic structural view of an embodiment of a control device of a two-stage throttle device, as shown in FIG. 6; the control device of the two-stage throttle device includes:
the obtaining module 401 is configured to obtain an intermediate supercooling degree, and a preset target supercooling degree, where the intermediate supercooling degree is: a degree of supercooling measured on a line between the two stages of throttling means;
And the adjusting module 402 is configured to adjust the opening of the primary throttling device and/or the opening of the secondary throttling device according to the intermediate supercooling degree and the target supercooling degree, so as to change the first pressure drop corresponding to the primary throttling device and/or the second pressure drop corresponding to the secondary throttling device.
In some embodiments of the present application, the adjusting module 402 in the control device of the two-stage throttling device includes:
Comparing the intermediate subcooling degree with the target subcooling degree;
If the intermediate supercooling degree is smaller than the target supercooling degree, increasing the opening corresponding to the first-stage throttling device, and reducing the first pressure drop corresponding to the first-stage throttling device, so that the intermediate point is far away from the saturated liquid line, and the intermediate supercooling degree is increased; acquiring the required flow of the evaporator, and adjusting the opening of the secondary throttling device according to the required flow of the evaporator;
If the intermediate supercooling degree is larger than the target supercooling degree, reducing the opening corresponding to the first-stage throttling device, and increasing the first pressure drop corresponding to the first-stage throttling device, so that the intermediate point is close to a saturated liquid line, and the intermediate supercooling degree is reduced; and obtaining the required flow of the evaporator, and adjusting the opening of the secondary throttling device according to the required flow of the evaporator.
In some embodiments of the present application, the adjusting module 402 in the control device of the two-stage throttling device includes:
Comparing the second intermediate subcooling degree with the target subcooling degree;
If the intermediate supercooling degree is smaller than the target supercooling degree, reducing the opening corresponding to the secondary throttling device, and increasing the second pressure drop corresponding to the secondary throttling device, so that the intermediate point is far away from the saturated liquid line, and the intermediate supercooling degree is increased; acquiring the required flow of the evaporator, and adjusting the opening of the primary throttling device according to the required flow of the evaporator;
If the second supercooling degree is larger than the target supercooling degree, increasing the opening degree corresponding to the secondary throttling device, and reducing the second pressure drop corresponding to the secondary throttling device, so that the intermediate point is close to the saturated liquid line, and the intermediate supercooling degree is reduced; and acquiring the required flow of the evaporator, and adjusting the opening of the primary throttling device according to the required flow of the evaporator.
The control device of the two-stage throttling device in this embodiment obtains an intermediate supercooling degree and a preset target supercooling degree, where the intermediate supercooling degree includes: a degree of supercooling measured on a line between the two stages of throttling means; according to the intermediate supercooling degree and the target supercooling degree, adjusting the opening degree of the primary throttling device and/or the opening degree of the secondary throttling device so as to change the first pressure drop corresponding to the primary throttling device and/or the second pressure drop corresponding to the secondary throttling device; in this embodiment, the intermediate supercooling degree of the two-stage throttling device and the required flow of the evaporator are controlled, so that the first-stage throttling device and the second-stage throttling device are conveniently controlled, the adjusting speed of the throttling device is faster, and the heat exchange efficiency of the evaporator is higher.
The embodiment of the invention also provides a refrigerating system of the refrigerating unit, as shown in fig. 7, which shows a schematic structural diagram of the refrigerating system of the refrigerating unit according to the embodiment of the invention.
The refrigerating unit is integrated with the control device of any two-stage throttling device provided by the embodiment of the invention, and comprises:
one or more processors;
A memory; and
One or more application programs, wherein the one or more application programs are stored in the memory and configured to be executed by the processor to perform the steps of the method of controlling a two-stage throttle device described in any of the embodiments of the method of controlling a two-stage throttle device described above.
Specifically, the present invention relates to a method for manufacturing a semiconductor device. The refrigeration unit may include one or more processing cores processor 501, one or more computer-readable storage medium memory 502, power supply 503, and input unit 504. It will be appreciated by those skilled in the art that the refrigeration unit configuration illustrated in fig. 7 is not limiting of the refrigeration unit and may include more or fewer components than illustrated, or may combine certain components, or a different arrangement of components. Wherein:
The processor 501 is the control center of the refrigeration unit, and utilizes various interfaces and lines to connect the various parts of the entire refrigeration unit, and performs various functions and processes of the refrigeration unit by running or executing software programs and/or modules stored in the memory 502, and invoking data stored in the memory 502, thereby performing overall monitoring of the refrigeration unit. Optionally, processor 501 may include one or more processing cores; preferably, the processor 501 may integrate an application processor that primarily handles operating systems, user interfaces, applications, etc., with a modem processor that primarily handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 501.
The memory 502 may be used to store software programs and modules, and the processor 501 executes various functional applications and data processing by executing the software programs and modules stored in the memory 502. The memory 502 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program (such as a sound playing function, an image playing function, etc.) required for at least one function, and the like; the storage data area may store data created from the use of the refrigeration unit, etc. In addition, memory 502 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid-state storage device. Accordingly, the memory 502 may also include a memory controller to provide access to the memory 502 by the processor 501.
The refrigeration unit further includes a power supply 503 for powering the various components, preferably, the power supply 503 may be logically coupled to the processor 501 via a power management system such that functions such as charge, discharge, and power consumption management are performed by the power management system. The power supply 503 may also include one or more of any of a direct current or alternating current power supply, a recharging system, a power failure detection circuit, a power converter or inverter, a power status indicator, and the like.
The refrigeration unit may also include an input unit 504, which input unit 504 may be used to receive entered numeric or character information and to generate keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function control.
Although not shown, the refrigeration unit may further include a display unit or the like, which is not described herein. In particular, in this embodiment, the processor 501 in the refrigerating unit loads executable files corresponding to the processes of one or more application programs into the memory 502 according to the following instructions, and the processor 501 executes the application programs stored in the memory 502, so as to implement various functions as follows:
Obtaining an intermediate supercooling degree and a preset target supercooling degree, wherein the intermediate supercooling degree is as follows: a degree of supercooling measured on a line between the two stages of throttling means;
and adjusting the opening of the primary throttling device and/or the opening of the secondary throttling device in real time according to the actual value of the intermediate supercooling degree and the difference value of the target supercooling degree so as to change the first pressure drop corresponding to the primary throttling device and/or the second pressure drop corresponding to the secondary throttling device.
Those of ordinary skill in the art will appreciate that all or a portion of the steps in the various methods of the above embodiments may be performed by instructions, or by instructions controlling associated hardware, which may be stored in a computer-readable storage medium and loaded and executed by a processor.
To this end, embodiments of the present invention provide a computer-readable storage medium, which may include: read Only Memory (ROM), random access Memory (RAM, random Access Memory), magnetic or optical disk, and the like. On which a computer program is stored, which computer program is loaded by a processor for executing the steps of any one of the control methods of the two-stage throttle device provided by the embodiments of the present invention. For example, the loading of the computer program by the processor may perform the steps of:
Obtaining an intermediate supercooling degree and a preset target supercooling degree, wherein the intermediate supercooling degree is as follows: a degree of supercooling measured on a line between the two stages of throttling means;
and adjusting the opening of the primary throttling device and/or the opening of the secondary throttling device in real time according to the actual value of the intermediate supercooling degree and the difference value of the target supercooling degree so as to change the first pressure drop corresponding to the primary throttling device and/or the second pressure drop corresponding to the secondary throttling device.
In the foregoing embodiments, the descriptions of the embodiments are focused on, and the portions of one embodiment that are not described in detail in the foregoing embodiments may be referred to in the foregoing detailed description of other embodiments, which are not described herein again.
In the implementation, each unit or structure may be implemented as an independent entity, or may be implemented as the same entity or several entities in any combination, and the implementation of each unit or structure may be referred to the foregoing method embodiments and will not be repeated herein.
The specific implementation of each operation above may be referred to the previous embodiments, and will not be described herein.
The above describes in detail a control method of a two-stage throttling device provided by the embodiment of the present application, and specific examples are applied herein to describe the principle and implementation of the present application, where the description of the above embodiment is only used to help understand the method and core idea of the present application; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present application, the present description should not be construed as limiting the present application.
Claims (8)
1. A two-stage throttling device, wherein the two-stage throttling device is applied to a refrigerating unit, the refrigerating unit comprises a split air conditioner, and the two-stage throttling device comprises:
A first-stage throttling device,
Two-stage throttle device
The connecting device is a pipeline part between the primary throttling device and the secondary throttling device;
the primary throttling device and the secondary throttling device are communicated through the connecting device;
The primary throttling device is an electric throttling device capable of adjusting flow, and is arranged on a unit main body part with an electric cabinet in the split air conditioner;
The secondary throttling device is an electric throttling device with adjustable flow or a mechanical throttling device with non-adjustable flow, and is arranged on the inlet side close to the evaporator in the split air conditioner;
the refrigerant flowing out of the primary throttling device and flowing into the secondary throttling device is in a pure liquid state.
2. A two-stage throttle device as defined in claim 1, wherein,
The first-stage throttling device is any one of an electronic expansion valve and a thermal expansion valve;
The secondary throttling device is any one of an electronic expansion valve, a thermal expansion valve, a throttling orifice plate and a capillary plate.
3. A control method of a two-stage throttle device, characterized in that the control method of the two-stage throttle device is used for controlling the two-stage throttle device according to any one of claims 1-2,
The control method of the two-stage throttling device comprises the following steps:
acquiring an intermediate supercooling degree and a preset target supercooling degree, wherein the intermediate supercooling degree is the supercooling degree measured on a pipeline between the two stages of throttling devices, and the target supercooling degree is the supercooling degree of preset high-pressure supercooling liquid;
And adjusting the opening of the primary throttling device and/or the opening of the secondary throttling device in real time according to the actual value of the intermediate supercooling degree and the difference value of the target supercooling degree so as to change the first pressure drop corresponding to the primary throttling device and/or the second pressure drop corresponding to the secondary throttling device, so that the refrigerant flowing out of the primary throttling device and flowing into the secondary throttling device is in a pure liquid state.
4. A control method of a two-stage throttle device according to claim 3, wherein said adjusting the opening degree of the one-stage throttle device and/or the opening degree of the two-stage throttle device in real time based on the difference between the actual value of the intermediate subcooling degree and the target subcooling degree includes:
Comparing the intermediate subcooling degree with the target subcooling degree;
If the intermediate supercooling degree is smaller than the target supercooling degree, increasing the opening corresponding to the first-stage throttling device, and reducing the first pressure drop corresponding to the first-stage throttling device, so that the intermediate point is far away from the saturated liquid line, and the intermediate supercooling degree is increased; acquiring the required flow of the evaporator, and adjusting the opening of the secondary throttling device according to the required flow of the evaporator;
If the intermediate supercooling degree is larger than the target supercooling degree, reducing the opening corresponding to the first-stage throttling device, and increasing the first pressure drop corresponding to the first-stage throttling device, so that the intermediate point is close to a saturated liquid line, and the intermediate supercooling degree is reduced; and obtaining the required flow of the evaporator, and adjusting the opening of the secondary throttling device according to the required flow of the evaporator.
5. A control method of a two-stage throttle device according to claim 3, wherein said adjusting the opening degree of the one-stage throttle device and/or the opening degree of the two-stage throttle device in real time based on the difference between the actual value of the intermediate subcooling degree and the target subcooling degree includes:
Comparing the intermediate subcooling degree with the target subcooling degree;
If the intermediate supercooling degree is smaller than the target supercooling degree, reducing the opening corresponding to the secondary throttling device, and increasing the second pressure drop corresponding to the secondary throttling device, so that the intermediate point is far away from the saturated liquid line, and the intermediate supercooling degree is increased; acquiring the required flow of the evaporator, and adjusting the opening of the primary throttling device according to the required flow of the evaporator;
if the intermediate supercooling degree is larger than the target supercooling degree, increasing the opening corresponding to the secondary throttling device, and reducing the second pressure drop corresponding to the secondary throttling device, so that the intermediate point is close to the saturated liquid line, and the intermediate supercooling degree is reduced; and acquiring the required flow of the evaporator, and adjusting the opening of the primary throttling device according to the required flow of the evaporator.
6. A control device of a two-stage throttle device electrically connected to the two-stage throttle device according to any one of claims 1-2, characterized in that the control device comprises:
the device comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring intermediate supercooling degree and preset target supercooling degree, and the intermediate supercooling degree refers to: the supercooling degree measured on a pipeline between the two stages of throttling devices, wherein the target supercooling degree is the supercooling degree of the preset high-pressure supercooled liquid;
and the adjusting module is used for adjusting the opening of the primary throttling device and/or the opening of the secondary throttling device in real time according to the actual value of the intermediate supercooling degree and the difference value of the target supercooling degree so as to change the first pressure drop corresponding to the primary throttling device and/or the second pressure drop corresponding to the secondary throttling device, so that the refrigerant flowing out of the primary throttling device and flowing into the secondary throttling device is in a pure liquid state.
7. A refrigeration unit, the refrigeration unit comprising:
one or more processors;
A memory; and
One or more applications, wherein the one or more applications are stored in the memory and are configured to be executed by the processor to implement the steps of the control method of the two-stage throttle device of any one of claims 3 to 5.
8. A computer-readable storage medium, characterized in that a computer program is stored thereon, which computer program is loaded by a processor to perform the steps in the control method of the two-stage throttle device according to any one of claims 3 to 5.
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