CN111623565A - Throttling device, refrigerant circulation system and dehumidifier - Google Patents

Abstract

The application relates to the technical field of electrical equipment and discloses a throttling device. The throttling device comprises a liquid inlet end, a liquid outlet end, a plurality of throttling branches and a switching valve; the plurality of throttling branch circuits are arranged between the liquid inlet end and the liquid outlet end, and the throttling flux of each throttling branch circuit is different; the switching valve is set to be controlled to communicate at least one throttling branch with the liquid inlet end and the liquid outlet end. According to the throttling device, a plurality of throttling branches with different throttling fluxes are arranged in the throttling device, and the throttling branches communicated with a refrigerant pipeline are switched through a switching valve; the throttling branch communicated with the liquid inlet end and the liquid outlet end is switched, so that the throttling flux between the liquid inlet end and the liquid outlet end of the throttling device is adjusted, the power of a refrigerant circulating system is adjusted, the starting and stopping frequency of the compressor is reduced, the loss of the compressor caused by starting and stopping is reduced, and the service life of the compressor is prolonged. The application also discloses a refrigerant circulation system and a dehumidifier.

Description

Throttling device, refrigerant circulation system and dehumidifier

Technical Field

The application relates to the technical field of electrical equipment, for example to a throttling device, a refrigerant circulating system and a dehumidifier.

Background

With the continuous improvement of the living standard of people, the dehumidifier is gradually expanded from commercial use to household use, and becomes an indispensable household appliance.

At present, most of household dehumidifiers are constant-frequency dehumidifiers and comprise a shell, a compressor, a heat exchanger, a fan and the like, and the working principle of the dehumidifier is that moist air is sucked into the shell of the dehumidifier by the fan, the heat exchanger exchanges heat with the moist air through the operation of the compressor, so that water vapor in the moist air is condensed into water, and the water content in the air is reduced.

In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:

because the dehumidification power of the constant-frequency dehumidifier is constant, when the environmental humidity is higher than the target humidity, the compressor operates; when the environmental humidity is less than the target humidity, the compressor is stopped; therefore, in the dehumidification process of the constant-frequency dehumidifier, the compressor is frequently started and stopped, the loss of the compressor is large, and the service life of the compressor is influenced.

Disclosure of Invention

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.

The embodiment of the disclosure provides a throttling device, a refrigerant circulating system and a dehumidifier, and aims to solve the problem that the loss of a compressor is large due to frequent start and stop of the compressor in the dehumidification process of a constant-frequency dehumidifier.

In some embodiments, the flow restriction device comprises: the liquid inlet end, the liquid outlet end, the plurality of throttling branches and the conversion valve; the plurality of throttling branch circuits are arranged between the liquid inlet end and the liquid outlet end, and the throttling flux of each throttling branch circuit is different; the switching valve is set to be controlled to communicate at least one throttling branch with the liquid inlet end and the liquid outlet end.

In some embodiments, the refrigerant cycle system includes the above-described throttling device.

In some embodiments, the dehumidifier comprises the refrigerant cycle system described above.

The throttling device, the refrigerant circulating system and the dehumidifier provided by the embodiment of the disclosure can realize the following technical effects:

a plurality of throttling branches with different throttling fluxes are arranged in the throttling device, and the throttling branches communicated with the refrigerant pipeline are switched through a switching valve; the throttling branch communicated with the liquid inlet end and the liquid outlet end is switched, so that the throttling flux between the liquid inlet end and the liquid outlet end of the throttling device is adjusted, the power of a refrigerant circulating system is adjusted, the starting and stopping frequency of the compressor is reduced, the loss of the compressor caused by starting and stopping is reduced, and the service life of the compressor is prolonged.

The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:

FIG. 1 is a schematic view of a throttle structure according to an embodiment of the present disclosure;

FIG. 2 is a schematic structural diagram of another throttling device provided by the embodiment of the disclosure;

FIG. 3 is a schematic illustration of a first throttle state provided by an embodiment of the present disclosure;

FIG. 4 is a schematic illustration of a second throttle state provided by an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of a third throttle state provided by embodiments of the present disclosure;

FIG. 6 is a schematic structural diagram of another throttling device provided by the embodiment of the disclosure;

fig. 7 is a schematic structural diagram of a refrigerant cycle system provided by the embodiment of the disclosure.

Reference numerals:

1. a throttling device; 10. a liquid inlet end; 20. a liquid outlet end; 30. a throttling branch; 31. a first branch; 311. a first end; 312. a second end; 32. a second branch circuit; 321. a third end; 322. a fourth end; 33. a third branch; 331. a fifth end; 332. a sixth terminal; 40. a changeover valve; 41. a first switching valve; 42. a second switching valve; 43. a first valve body; 44. a second valve body; 2. a compressor; 3. an evaporator; 4. a condenser.

Detailed Description

So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.

The terms "first," "second," and the like in the description and in the claims, and the above-described drawings of embodiments of the present disclosure, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the present disclosure described herein may be made. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.

In the embodiments of the present disclosure, the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the disclosed embodiments and their examples and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation. Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the embodiments of the present disclosure can be understood by those of ordinary skill in the art as appropriate.

In addition, the terms "disposed," "connected," and "secured" are to be construed broadly. For example, "connected" may be a fixed connection, a detachable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. Specific meanings of the above terms in the embodiments of the present disclosure can be understood by those of ordinary skill in the art according to specific situations.

The term "plurality" means two or more unless otherwise specified.

In the embodiment of the present disclosure, the character "/" indicates that the preceding and following objects are in an or relationship. For example, A/B represents: a or B.

The term "and/or" is an associative relationship that describes objects, meaning that three relationships may exist. For example, a and/or B, represents: a or B, or A and B.

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

As shown in fig. 1-2, the present disclosure provides a throttling device, which includes an inlet end 10, an outlet end 20, a plurality of throttling branches 30, and a switching valve 40; the plurality of throttling branches 30 are arranged between the liquid inlet end 10 and the liquid outlet end 20, and the throttling flux of each throttling branch 30 is different; the switching valve 40 is arranged to controllably communicate at least one throttling branch 30 with the inlet side 10 and the outlet side 20.

By adopting the throttling device provided by the embodiment of the disclosure, the throttling branch circuits 30 communicated with the refrigerant pipeline can be switched by arranging the throttling branch circuits 30 with different throttling fluxes and then switching the throttling branch circuits 30 by the switching valve 40; by switching at least one throttling branch 30 communicated with the liquid inlet end 10 and the liquid outlet end 20, the throttling flux between the liquid inlet end 10 and the liquid outlet end 20 of the throttling device is adjusted, so that the power adjustment of a refrigerant circulating system is realized, the starting and stopping frequency of the compressor is reduced, the loss of the compressor caused by starting and stopping is reduced, and the service life of the compressor is prolonged.

Alternatively, the throttle branch 30 may be a refrigerant line provided with a throttling element. When the throttling device is connected to the refrigerant circulation flow path, the refrigerant flows through the throttling device, flows in from the liquid inlet end 10, passes through the at least one throttling branch 30, and flows out from the liquid outlet end 20.

Here, the difference in the throttle flow rate of each throttle branch 30 can be realized by the difference in the throttle flow rate of the throttle element provided in each throttle branch 30. The throttling element may be a capillary tube, an electronic expansion valve, or the like. In the embodiment of the present disclosure, a capillary tube is taken as an example, and other throttling elements may be used in other embodiments of the present disclosure.

In practical applications, the throttling element may be a capillary tube, in which case, each throttling branch 30 is provided with at least one capillary tube, and the different throttling fluxes of the throttling elements refer to different tube diameters of the capillary tubes provided in each throttling branch 30.

In practical applications, the throttling element may be an electronic expansion valve, in which case, each of the throttling branches 30 is provided with at least one electronic expansion valve, and the difference in throttling flux of the throttling element means that the flow opening degrees of the electronic expansion valves provided in each of the throttling branches 30 are different.

Optionally, a change-over valve 40 is arranged at the inlet side 10 and/or at the outlet side 20. Therefore, as the throttling fluxes of the throttling branches 30 are different, the switching valve 40 is controlled to communicate at least one throttling branch 30 with the liquid inlet end 10 and the liquid outlet end 20, so that the different throttling fluxes connected into the refrigerant circulating flow path are realized, and under the condition that the output power of the constant-frequency compressor is not changed, the refrigerating power of the refrigerant circulating flow path is adjusted by switching the throttling fluxes of the throttling devices, the dehumidification capacity of the dehumidifier in unit time is further adjusted, and the starting and stopping times of the compressor are reduced.

Alternatively, the change-over valve 40 is arranged at the inlet 10 or the outlet 20, wherein the change-over valve 40 is arranged to controllably connect one throttling branch 30 with the inlet 10 and the outlet 20.

Optionally, the change-over valve 40 is disposed at the liquid inlet 10, the change-over valve 40 includes a liquid inlet and a plurality of liquid outlets, the liquid inlet is communicated with the liquid inlet 10, and each liquid outlet is connected to one throttling branch 30, so that the liquid outlets are in one-to-one correspondence with the throttling branches 30, that is, the number of the liquid outlets is equal to the number of the throttling branches 30. By switching the liquid outlet communicating with the liquid inlet, the switching of the throttle branch 30 communicating with the liquid inlet 10 is realized. At this time, the liquid outlet end 20 may be provided with a current collecting element for communicating each throttling branch 30 with the liquid outlet end 20.

Alternatively, the change-over valve 40 is disposed at the outlet end 20, and in this case, the inlet end 10 may be provided with a flow dividing element for communicating the inlet end 10 with each throttling branch 30. Wherein, the change-over valve 40 includes a plurality of liquid inlets and a liquid outlet, each liquid inlet connects a throttle branch 30, make the liquid inlet correspond to throttle branch 30 one-to-one; the liquid outlet is communicated with the liquid outlet end 20. By switching the inlet port in communication with the outlet port, switching of the throttle branch 30 in communication with the outlet port 20 is achieved.

Optionally, the liquid inlet end 10 and the liquid outlet end 20 are both provided with a change-over valve 40, the change-over valve 40 comprises a first change-over valve and a second change-over valve, the first change-over valve is arranged at the liquid inlet end 10, and the second change-over valve is arranged at the liquid outlet end 20; the first conversion valve comprises a liquid inlet and a plurality of liquid outlets, the liquid inlet is communicated with the liquid inlet end 10, and each liquid outlet is connected with a throttling branch 30; the second switching valve comprises a plurality of liquid inlets and a liquid outlet, each liquid inlet is connected with a throttling branch 30, and the liquid outlet is communicated with the liquid outlet 20.

For example, the plurality of throttle legs 30 includes a first leg and a second leg; the first switching valve comprises a first liquid outlet connected with the first branch and a second liquid outlet connected with the second branch; the second conversion valve comprises a first liquid inlet connected with the first branch and a second liquid inlet connected with the second branch. When the first conversion valve is switched to the liquid inlet to be communicated with the first liquid outlet, correspondingly, the second conversion valve is switched to the first liquid inlet to be communicated with the corresponding liquid outlet. At this moment, when the refrigerant flows through the throttling device, the refrigerant enters from the liquid inlet of the first conversion valve, flows to the first branch circuit from the first liquid outlet, flows into the second conversion valve from the first branch circuit through the first liquid inlet, and flows out from the liquid outlet of the second conversion valve.

Similarly, when the first switching valve is switched to communicate the liquid inlet with the second liquid outlet, correspondingly, the second switching valve is switched to communicate the second liquid inlet with the corresponding liquid outlet. At this moment, when the refrigerant flows through the throttling device, the refrigerant enters from the liquid inlet of the first conversion valve, flows to the second branch from the second liquid outlet, flows into the second conversion valve from the second branch through the second liquid inlet, and flows out from the liquid outlet of the second conversion valve.

Therefore, the diameters of the capillary tube of the first branch and the capillary tube of the second branch are different, so that the throttling flux of the first branch and the throttling flux of the second branch are enabled to realize that the refrigerating power of the refrigerant circulating flow path is adjusted by switching the throttling flux of the throttling device under the condition that the output power of the constant-frequency compressor is not changed, the dehumidifying capacity of the dehumidifier in unit time is further adjusted, the starting and stopping times of the compressor are reduced, the loss of the compressor caused by starting and stopping is reduced, and the service life of the compressor is prolonged.

Optionally, as shown in connection with fig. 3-5, the plurality of throttle legs 30 includes a first leg 31, a second leg 32, and a third leg 33; the switching valve 40 is a four-way valve, and the switching valve 40 includes: the first conversion valve 41 is arranged at the liquid inlet end 10; and a second switching valve 42 arranged at the liquid outlet end 20.

Optionally, the first branch 31 comprises a first end 311 and a second end 312, the first throttling element being arranged between the first end 311 and the second end 312; the second branch 32 comprises a third end 321 and a fourth end 322, and the second throttling element is arranged between the third end 321 and the fourth end 322; the third branch 33 includes a fifth terminal 331 and a sixth terminal 332, and the third throttling element is disposed between the fifth terminal 331 and the sixth terminal 332. At this time, the first end 311 of the first branch 31, the third end 321 of the second branch 32, and the fifth end 331 of the third branch 33 are connected to the first switching valve 41; the second end 312 of the first branch 31, the fourth end 322 of the second branch 32, and the sixth end 332 of the third branch 33 are connected to the second switching valve 42.

Wherein the throttling flux of the first throttling element is larger than the throttling flux of the third throttling element; the throttling flux of the third throttling element is larger than the throttling flux of the second throttling element.

Here, the first switching valve 41 includes a first position and a second position. Wherein, the first position may mean that the first switching valve 41 is switched to connect the inlet 10 to the first end 311 of the first branch 31, and the third end 321 of the second branch 32 is connected to the fifth end 331 of the third branch 33. The second position may mean that the first switching valve 41 is switched to the inlet port 10 to communicate with the fifth port 331 of the third branch 33, and the first port 311 of the first branch 31 communicates with the third port 321 of the second branch 32.

Here, the second switching valve 42 includes a third position and a fourth position. The third position may mean that the second switching valve 42 is switched to connect the second end 312 of the first branch 31 with the outlet port 20, and the fourth end 322 of the second branch 32 is connected with the sixth end 332 of the third branch 33. The fourth position may refer to the second switching valve 42 being switched to communicate the sixth end 332 of the third branch 33 with the outlet port 20 and the second end 312 of the first branch 31 with the fourth end 322 of the second branch 32.

Optionally, the plurality of throttle legs 30 includes a first leg 31, a second leg 32, and a third leg 33; the switching valve 40 is controlled to switch to one of the following states: the first branch 31 is communicated with the liquid inlet end 10 and the liquid outlet end 20; the third branch 33 is communicated with the liquid inlet end 10 and the liquid outlet end 20; the first branch 31, the second branch 32 and the third branch 33 are communicated in sequence, the first branch 31 is communicated with the liquid inlet end 10, and the third branch 33 is communicated with the liquid outlet end 20. That is, the throttling means comprises a first throttling state, a second throttling state and a third throttling state.

Alternatively, the first throttling state is that the first switching valve 41 is switched to the first position and the second switching valve 42 is switched to the third position, i.e. the first branch 31 is communicated with the liquid inlet end 10 and the liquid outlet end 20. At this time, when the throttle device is installed in the refrigerant circulation flow path and the refrigerant passes through the throttle device, the refrigerant enters from the inlet port 10, passes through the first switching valve 41, flows into the first branch path 31 from the first port 311, flows into the second switching valve 42 from the second port 312, passes through the second switching valve 42, and flows out from the outlet port 20.

Alternatively, the second throttling state is that the first switching valve 41 is switched to the second position and the second switching valve 42 is switched to the fourth position, i.e. the second branch 32 is communicated with the liquid inlet end 10 and the liquid outlet end 20. At this time, when the throttling device is installed in the refrigerant circulation flow path and the refrigerant passes through the throttling device, the refrigerant enters from the inlet end 10, passes through the first switching valve 41, flows into the third branch 33 from the fifth end 331, flows into the second switching valve 42 from the sixth end 332, passes through the second switching valve 42, and flows out from the outlet end 20.

Optionally, the second throttling state is that the first switching valve 41 is switched to the first position and the second switching valve 42 is switched to the fourth position, that is, the third throttling state is that the first branch 31, the third branch 33 and the second branch 32 are communicated in sequence, the first branch 31 is communicated with the liquid inlet end 10, and the second branch 32 is communicated with the liquid outlet end 20. At this time, when the throttling device is installed in the refrigerant circulation flow path and the refrigerant passes through the throttling device, the refrigerant enters from the inlet port 10, passes through the first switching valve 41, flows into the first branch path 31 from the first end 311, flows through the second switching valve 42 from the second end 312 to the fourth end 322, flows through the second branch path 32, flows through the first switching valve 41 from the third end 321 to the fifth end 331, flows through the third branch path 33, flows through the sixth end 332 to the second switching valve 42, and flows out from the outlet port 20 through the second switching valve 42.

In this way, since the first switching valve 41 of the throttling device can be switched between the first position and the second position, the second switching valve 42 can be switched between the third position and the fourth position; by the cooperation of the first switching valve 41 and the second switching valve 42, switching of the throttle states of three different throttle fluxes is achieved. The throttling device is used for adjusting the refrigerating power of a refrigerant circulating flow path by switching the throttling flux of the throttling device under the condition that the output power of the fixed-frequency compressor is not changed in a refrigerant circulating system, so that the dehumidifying capacity of the dehumidifier in unit time is adjusted, the starting and stopping times of the compressor are reduced, the loss of the compressor caused by starting and stopping is reduced, and the service life of the compressor is prolonged.

Alternatively, as shown in connection with fig. 6, the switching valve 40 includes: a plurality of check valves corresponding to the plurality of throttle legs 30 one to one; each one-way valve is arranged on the corresponding throttling branch 30 and is configured to control the on-off of the throttling branch 30. Therefore, the switching valve 40 can be arranged on the throttling branch 30, and the switching of the corresponding throttling branch 30 can be realized by controlling the switching of the switching valve 40, so that the throttling branch 30 adapting to the environmental humidity is communicated with the liquid inlet end 10 and the liquid outlet end 20.

Alternatively, the switching valve 40 includes a first valve body 43 and a second valve body 44, and the plurality of throttle branches 30 includes a first branch and a second branch. The first valve body 43 is disposed in the first branch, and the second valve body 44 is disposed in the second branch. The first throttling state is that the first valve body 43 is opened and the second valve body 44 is closed, and at this time, the first branch is communicated with the liquid inlet end 10 and the liquid outlet end 20. The second throttling state is that the first valve body 43 is closed and the second valve body 44 is opened, and at this time, the first branch is communicated with the liquid inlet end 10 and the liquid outlet end 20.

In this way, when the expansion device is attached to the refrigerant circulation flow path and the refrigerant passes through the expansion device, the first valve element 43 and the second valve element 44 are controlled according to the different environmental humidity conditions, whereby the expansion branch 30 having an appropriate opening degree for communication is selected.

Optionally, each throttling branch 30 comprises at least one capillary tube. Because the pipe diameter of the capillary is certain, the throttle flux is certain, a capillary can be arranged on each throttle branch 30, and the capillary with different pipe diameters is selected, so that the throttle fluxes of the throttle branches 30 are different. Therefore, the throttling element installed in the throttling device is a capillary tube, and the throttling flux of the throttling device can be adjusted through the matching of the plurality of throttling branches 30 and the switching valve 40. And then realize refrigerant cycle system's power regulation, reduce the start-stop frequency of compressor, reduce the compressor because the loss that the start-stop caused, prolong the life of compressor.

As shown in fig. 7, the embodiment of the present disclosure provides a refrigerant circulation system, including a refrigerant circulation flow path formed by a compressor 2, an evaporator 3 and a condenser 4, and further including the above-mentioned throttling device 1, where the throttling device 1 is disposed between the evaporator 3 and the condenser 4, and the throttling device 1 includes a plurality of throttling branches 30 and a switching valve 40.

By adopting the refrigerant circulating system provided by the embodiment of the disclosure, the throttling device 1 capable of switching different throttling fluxes is arranged between the evaporator 3 and the condenser 4, and the at least one throttling branch 30 communicated with the liquid inlet end 10 and the liquid outlet end 20 is switched by controlling the switching valve 40, so that the throttling flux between the liquid inlet end 10 and the liquid outlet end 20 of the throttling device 1 can be adjusted, the power adjustment of the refrigerant circulating system is realized, the starting and stopping frequency of the compressor 2 is reduced, the loss of the compressor 2 caused by starting and stopping is reduced, and the service life of the compressor 2 is prolonged.

Here, the throttle branch 30 or the refrigerant circulation system having the same may be applied to an air conditioner, a dehumidifier, and other electric appliances having a refrigerant circulation flow path. In the embodiment of the present disclosure, a dehumidifier is taken as an example, and other electrical devices may be used in other embodiments of the present application.

The embodiment of the disclosure provides a dehumidifier which comprises the refrigerant circulating system. In this way, the dehumidifier is provided with a refrigerant circulation flow path composed of the compressor 2, the evaporator 3 and the condenser 4 and the throttling device 1; the throttling device 1 is arranged between the evaporator 3 and the condenser 4; the throttling device 1 comprises a liquid inlet end 10, a liquid outlet end 20, a plurality of throttling branches 30 and a switching valve 40; the plurality of throttling branches 30 are arranged between the liquid inlet end 10 and the liquid outlet end 20, and the throttling flux of each throttling branch 30 is different; the switching valve 40 is arranged to controllably communicate at least one throttling branch 30 with the inlet side 10 and the outlet side 20. The throttling flux between the liquid inlet end 10 and the liquid outlet end 20 of the throttling device 1 is adjusted, so that the power adjustment of a refrigerant circulating system is realized, the starting and stopping frequency of the compressor 2 is reduced, the loss of the compressor 2 caused by starting and stopping is reduced, and the service life of the compressor 2 is prolonged.

The above description and drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The embodiments of the present disclosure are not limited to the structures that have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (10)

1. A flow restriction device, comprising:

a liquid inlet end;

a liquid outlet end;

the plurality of throttling branches are arranged between the liquid inlet end and the liquid outlet end, and the throttling flux of each throttling branch is different;

and the conversion valve is set to be controlled to communicate at least one throttling branch with the liquid inlet end and the liquid outlet end.

2. The throttle device of claim 1,

the change-over valve is arranged at the liquid inlet end and/or the liquid outlet end.

3. A flow restriction device according to claim 2, wherein the change-over valve is provided at the inlet port or the outlet port;

wherein the change-over valve is arranged to be controlled to communicate a throttling branch with the inlet end and the outlet end.

4. Throttling device according to claim 2,

the plurality of throttling branches comprise a first branch, a second branch and a third branch;

the switching valve is controlled to switch to one of the following states:

communicating the first branch with the liquid inlet end and the liquid outlet end;

communicating the third branch with the liquid inlet end and the liquid outlet end;

and sequentially communicating the first branch, the second branch and the third branch, communicating the first branch with the liquid inlet end, and communicating the third branch with the liquid outlet end.

5. The throttle device of claim 1, wherein the switching valve comprises:

the first conversion valve is arranged at the liquid inlet end;

and the second conversion valve is arranged at the liquid outlet end.

6. The throttle device of claim 1, wherein the switching valve is a four-way valve.

7. The throttle device of claim 1, wherein the switching valve comprises:

the plurality of one-way valves correspond to the plurality of throttling branches one by one; each one-way valve is arranged on the corresponding throttling branch and is used for controlling the on-off of the throttling branch.

8. A flow restriction device according to any of claims 1 to 7 wherein each flow restriction branch comprises at least one capillary tube.

9. A refrigerant cycle system comprising a refrigerant cycle flow path constituted by a compressor, an evaporator and a condenser, and further comprising a throttle device according to any one of claims 1 to 8, said throttle device being disposed between said evaporator and said condenser.

10. A dehumidifier comprising the refrigerant cycle system of claim 9.

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