Throttling device and tableware processing device

Abstract

The throttling device comprises a plurality of throttling assemblies. Each throttling assembly comprises a throttling valve and a control valve connected with the throttling valve in series. The control valve of at least one throttling assembly is connected with at least one of the other throttling assemblies in parallel.

Description

Technical Field

[0001] This application belongs to the technical field of electrical equipment, and particularly relates to a throttling device and a tableware treatment device. Background Art

[0002] A tableware treatment device is an intelligent household appliance product that replaces manual tableware handling and is currently widely used. During the process of cleaning tableware, a circulation pump is required to transport the washing water to each rotating spray arm to continuously cover and spray the tableware for washing to achieve the purpose of cleaning the tableware. In order to further shorten the washing time of the dishwasher, the existing tableware treatment device washing system will use an electric heater to increase the water temperature of the washing water. Under the action of the circulating spray of the washing water, the high-temperature washing water washes away the contaminants on the tableware and at the same time brings heat to the tableware, so that the tableware treatment device can obtain a high cleaning rate and drying rate in a relatively short washing time. Since during the entire working cycle, the heating energy consumption of the washing water accounts for more than 80% of the total energy consumption of the tableware treatment device.

[0003] A throttling device is required in both the drying process and the heat pump process of the tableware treatment device, which can change the state of the heat exchange medium for the circulation of the heat exchange medium. However, the throttling devices in the current related technologies are all separate throttling components, resulting in poor throttling effects and easy occurrence of heat source waste. Summary of the Invention

[0004] This application aims to at least solve the technical problem of poor throttling effect to a certain extent. For this purpose, this application provides a throttling device and a tableware treatment device.

[0005] In a first aspect, a throttling device provided in an embodiment of this application is disposed between two heat exchangers. The throttling device includes: a plurality of throttling components, and the throttling components include:

[0006] A throttle valve and a control valve connected in series with the throttle valve;

[0007] Wherein, the control valve of at least one of the throttling components is connected in parallel with at least one of the other throttling components.

[0008] Each throttling component includes a throttle valve and a control valve connected in series therewith. At least one of the control valves of the throttling components is connected in parallel with at least one of the other throttling components. This means that the control valve of one throttling component is connected in parallel with an entire other throttling component. If this control valve is opened, the entire other throttling component is short-circuited, and only the throttle valve corresponding to this control valve can conduct. If this control valve is closed and the control valve of the throttling component connected in parallel therewith is opened, then the two throttle valves can conduct simultaneously. Thus, it can be seen that through the cooperation of multiple control valves, different numbers of throttle valves can be made to conduct, and thus different flow rates can be adjusted. By the cooperation of different control valves, the number of throttle valves is adjusted to adjust the flow rate, eliminating the need to set throttle valves with different flow rates, thereby reducing the variable flow rate cost.

[0009] In an alternative embodiment of the present application, the throttling device includes a first throttling component and a second throttling component. The first throttling component includes a first throttle valve and a first control valve, and the second throttling component includes a second throttle valve and a second control valve. The first control valve is connected in series with the first throttle valve, the second control valve is connected in series with the second throttle valve, and the second control valve is connected in parallel with both the first throttle valve and the first control valve.

[0010] In an alternative embodiment of the present application, the first control valve, the first throttle valve, and the second throttle valve are connected in sequence. There is a first connection point between the first throttle valve and the second throttle valve, and one end of the second control valve is connected to the first connection point.

[0011] In an alternative embodiment of the present application, the end of the second control valve remote from the first connection point is connected to a section of the first control valve remote from the first throttle valve to form an input point, and the end of the second throttle valve remote from the first throttle valve forms an output point.

[0012] In an alternative embodiment of the present application, the first throttle valve and the second throttle valve are connected in series.

[0013] Second, an embodiment of the present application provides a tableware treatment device, including:

[0014] A housing having a receiving cavity, an air outlet, a return air opening, a water outlet, and a water return opening communicating with the receiving cavity. The receiving cavity is used for receiving tableware;

[0015] A return air passage, a blower, a first heat exchanger, and a second heat exchanger. The return air passage communicates with the air outlet and the return air opening. The blower, the first heat exchanger, and the second heat exchanger are all disposed in the return air passage. The first heat exchanger is disposed near the air outlet, and the second heat exchanger is disposed near the return air opening;

[0016] A heat pump passage, a circulation pump, and a third heat exchanger, where the heat pump passage is communicated with the water outlet and the water return port, and the circulation pump and the third heat exchanger are arranged in the heat pump passage;

[0017] A compressor, where the outlet of the compressor is connected to the first heat exchanger and the third heat exchanger, and the inlet of the compressor is connected to the second heat exchanger or the first heat exchanger.

[0018] The throttling device provided in the first aspect is arranged between any two of the first heat exchanger, the second heat exchanger, and the third heat exchanger.

[0019] The beneficial effects of the tableware treatment device provided in the second aspect are the same as those of the throttling device provided in the first aspect, and will not be elaborated here.

[0020] In an optional embodiment of the present application, the throttling device is arranged between the first heat exchanger and the second heat exchanger, and the input point of the throttling device is connected to the first heat exchanger, and the input point of the throttling device is connected to the second heat exchanger.

[0021] In an optional embodiment of the present application, the throttling device is arranged between the third heat exchanger and the first heat exchanger or the second heat exchanger, the input point of the throttling device is connected to the third heat exchanger, and the output point of the throttling device is connected to the first heat exchanger or the second heat exchanger.

[0022] In an optional embodiment of the present application, the air outlet and the air return port are arranged on the same side of the housing.

[0023] In an optional embodiment of the present application, the air return passage is provided with an air inlet and an air outlet. The air inlet is arranged between the first heat exchanger and the air outlet, and the air outlet is arranged between the second heat exchanger and the air return port. Under the condition that the circulation pump is started, the air inlet and the air outlet are opened, and the air outlet and the air return port are closed. Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 Fig. shows a schematic structural diagram of a first throttling device of the tableware treatment device provided by the embodiment of the present application.

[0026] Figure 2Shows another structural schematic diagram of the first throttling device of the tableware processing device provided by the embodiment of the present application.

[0027] Figure 3 Shows a structural schematic diagram of the tableware processing device provided by the embodiment of the present application when in the drying mode.

[0028] Figure 4 Shows a structural schematic diagram of the second heat exchanger as an evaporator when the tableware processing device provided by the embodiment of the present application is in the heat pump mode.

[0029] Figure 5 Shows a structural schematic diagram of the first heat exchanger as an evaporator when the tableware processing device provided by the embodiment of the present application is in the heat pump mode.

[0030] Reference numerals: 100 - tableware processing device, 110 - housing, 112 - accommodation cavity, 113 - air outlet, 114 - air return opening, 115 - water outlet, 116 - water return opening;

[0031] 120 - air return channel, 121 - air inlet, 123 - air discharge opening, 125 - first air valve, 126 - second air valve;

[0032] 132 - fan, 134 - first heat exchanger, 136 - second heat exchanger;

[0033] 140 - throttling device, 141 - throttling assembly, 141a - throttle valve, 141b - control valve;

[0034] 142 - first throttling assembly, 142a - first throttle valve, 142b - first control valve, 143 - second throttling assembly, 143a - second throttle valve, 143b - second control valve, 145 - third throttling assembly, 145a - third throttle valve, 145b - third control valve, 146a - first connection point, 146b - input point, 146c - output point;

[0035] 150 - heat pump channel, 152 - circulation pump, 154 - third heat exchanger, 160 - compressor, 162 - inlet, 164 - outlet, 172 - first reversing valve, 174 - second reversing valve. Detailed implementation manners

[0036] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0037] It should be noted that all the directional indications in the embodiments of the present application are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0038] In the present application, unless otherwise clearly defined and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0039] In addition, in the present application, descriptions such as "first", "second", etc. are only for descriptive purposes and should not be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present application.

[0040] Tableware treatment devices are intelligent household appliances that replace manual tableware handling and are currently widely used. During the process of cleaning tableware, a circulation pump is required to transport the washing liquid to each rotating spray arm to continuously cover and spray the tableware for washing to achieve the purpose of cleaning the tableware. In order to further shorten the washing time of the dishwasher, the existing tableware treatment device washing system will adopt the method of setting an electric heater to increase the water temperature of the washing liquid. Under the action of the circulating spray of the washing liquid, the high-temperature washing liquid flushes away the pollutants on the tableware and brings heat to the tableware, so that the tableware treatment device can obtain a higher cleaning rate and drying rate in a shorter washing time. Since during the entire working cycle, the heating energy consumption of the washing liquid accounts for more than 80% of the total energy consumption of the tableware treatment device.

[0041] A throttling device is required both in the drying process and the heat pump process of the tableware treatment device. The throttling device can change the state of the heat exchange medium for the circulation of the heat exchange medium. However, the throttling devices in the current related technologies are all separate throttling components, resulting in poor throttling effects and easy occurrence of heat source waste. The throttling device and the tableware treatment device provided by the embodiments of the present application can improve the above problems. The throttling device and the tableware treatment device provided by the embodiments of the present application can achieve variable flow resistance under different working conditions, thereby improving the heat pump efficiency.

[0042] The present application will be described below with reference to the accompanying drawings and specific embodiments:

[0043] Please refer to Figure 1 , an embodiment of the present application provides a throttling device 140. The throttling device 140 provided by the embodiment of the present application can achieve variable flow resistance under different working conditions, thereby improving the heat pump efficiency.

[0044] The throttling device 140 provided by the embodiment of the present application is applied between two heat exchangers, and can be in the tableware treatment device 100, or can be applied in a separate air conditioner or heat pump.

[0045] In the embodiment of the present application, the throttling device 140 includes: a plurality of throttling components 141, and each throttling component 141 includes:

[0046] a throttle valve 141a and a control valve 141b connected in series with the throttle valve 141a;

[0047] wherein, the control valve 141b of at least one of the throttling components 141 is connected in parallel with at least one of the other throttling components 141.

[0048] Each throttling component 141 includes a throttle valve 141a and a control valve 141b connected in series therewith. The control valve 141b of at least one of the throttling components 141 is connected in parallel with at least one of the other throttling components 141, which means that the control valve 141b of one of the throttling components 141 is connected in parallel with an entire other throttling component 141. If the control valve 141b is opened, the entire other throttling component 141 is short-circuited, and only the throttle valve 141a corresponding to the control valve 141b can conduct. If the control valve 141b is closed and the control valve 141b of the throttling component 141 connected in parallel therewith is opened, the two throttle valves 141a can conduct simultaneously. Thus, it can be seen that through the cooperation of multiple control valves 141b, different numbers of throttle valves 141a can be conducted, and thus different flows can be adjusted. By the cooperation of different control valves 141b, the number of throttle valves 141a is adjusted to adjust the flow, and there is no need to set throttle valves 141a with different flows, thereby reducing the variable flow cost.

[0049] The opening degrees of the multiple throttle valves 141a can be the same or different, and the flow can be adjusted by the number of inlets.

[0050] In order to more clearly illustrate the above structure, two throttling components 141 will be taken as an example for illustration.

[0051] In some embodiments, the throttling device 140 includes a first throttling component 142 and a second throttling component 143. The first throttling component 142 includes a first throttle valve 142a and a first control valve 142b. The second throttling component 143 includes a second throttle valve 143a and a second control valve 143b. The first control valve 142b is connected in series with the first throttle valve 142a. The second control valve 143b is connected in series with the second throttle valve 141a. The second control valve 143b is connected in parallel with both the first throttle valve 142a and the first control valve 142b.

[0052] That is to say, the second control valve 143b is respectively connected to both ends of the first throttling component 142 and is connected in parallel with the whole first throttling component 142. When the first control valve 142b is open and the second control valve 143b is closed, the first throttle valve 142a and the second throttle valve 141a work simultaneously, and the first throttle valve 142a and the second throttle valve 141a limit the flow rate simultaneously. When the second control valve 143b is open and the first control valve 142b is closed, only the second throttle valve 141a works, and the second throttle valve 141a limits the flow rate.

[0053] Please refer to Figure 2 , when a third throttling component 145 is further included, the third throttling component 145 also includes a connected third throttle valve 145a and a third control valve 145b. The third throttle valve 145a is connected in series with the second throttle valve 141a. The third control valve 145b is connected in parallel with the whole second throttling component 143. When the first control valve 142b is open and the second control valve 143b and the third control valve are closed, the first throttle valve 142a, the second throttle valve 141a, and the third throttle valve 145a work simultaneously, and the first throttle valve 142a, the second throttle valve 141a, and the third throttle valve 145a limit the flow rate simultaneously. When the second control valve 143b is open and the first control valve 142b and the third control valve 145b are closed, the second throttle valve 141a and the third throttle valve 145a work, and the first throttle valve 142a does not work. When the third control valve 145b is open and the first control valve 142b and the second control valve 143b are closed, only the third throttle valve 145a works.

[0054] When the throttling device 140 further includes other throttling components 141, it can be inferred by analogy and will not be listed one by one. For the convenience of description, the specific connection relationships are all described with the inclusion of the first throttling component 142 and the second throttling component 143, and the rest can be inferred by analogy.

[0055] In some embodiments, the first control valve 142b, the first throttle valve 142a, and the second throttle valve 141a are connected in sequence. There is a first connection point 146a between the first throttle valve 142a and the second throttle valve 141a. One end of the second control valve 143b is connected to the first connection point 146a. That is, the second control valve 143b is connected between the first throttle valve 142a and the second throttle valve 141a, so that the first throttle valve 142a can be short-circuited.

[0056] In some embodiments, the end of the second control valve 143b away from the first connection point 146a is connected to a section of the first control valve 142b away from the first throttle valve 142a, and an input point 146b is formed. The end of the second throttle valve 141a away from the first throttle valve 142a forms an output point 146c.

[0057] Wherein, the input point 146b and the output point 146c are used to connect to external components. For example, if the throttling device 140 is arranged between two heat exchangers, the input point 146b and the output point 146c are respectively connected to the two heat exchangers.

[0058] In some embodiments, the first throttle valve 142a and the second throttle valve 141a are connected in series.

[0059] The working principle of the throttling device 140 provided by the embodiments of the present application: Each throttling component 141 includes a throttle valve 141a and a control valve 141b connected in series therewith. The control valve 141b of at least one of the throttling components 141 is connected in parallel with at least one of the other throttling components 141, which means that the control valve 141b of one of the throttling components 141 is connected in parallel with an entire other throttling component 141. If the control valve 141b is opened, the entire other throttling component 141 is short-circuited, and only the throttle valve 141a corresponding to the control valve 141b can conduct. If the control valve 141b is closed and the control valve 141b of the throttling component 141 connected in parallel therewith is opened, the two throttle valves 141a can conduct simultaneously.

[0060] In summary, for the throttling device 140 provided in the embodiment of the present application, each throttling component 141 includes a throttle valve 141a and a control valve 141b connected in series therewith. The control valve 141b of at least one of the throttling components 141 is connected in parallel with at least one of the other throttling components 141, which means that the control valve 141b of one throttling component 141 is connected in parallel with an entire other throttling component 141. If the control valve 141b is opened, the entire other throttling component 141 is short-circuited, and only the throttle valve 141a corresponding to this control valve 141b can conduct. If the control valve 141b is closed and the control valve 141b of the throttling component 141 connected in parallel therewith is opened, the two throttle valves 141a can conduct simultaneously. Thus, it can be seen that by the cooperation of multiple control valves 141b, different numbers of throttle valves 141a can be made to conduct, and thus different flow rates can be adjusted. By the cooperation of different control valves 141b, the number of throttle valves 141a is adjusted to adjust the flow rate, and there is no need to provide throttle valves 141a with different flow rates, thereby reducing the variable flow cost.

[0061] Please refer to Figure 3 , based on the same inventive concept, the embodiment of the present application further provides a tableware treatment device 100, including:

[0062] A housing 110 having a receiving cavity 112, an air outlet 113, a return air inlet 114, a water outlet 115, and a water return port 116 communicating with the receiving cavity 112, and is used to receive tableware;

[0063] A return air passage 120, a fan 132, a first heat exchanger 134, and a second heat exchanger 136. The return air passage 120 communicates with the air outlet 113 and the return air inlet 114. The fan 132, the first heat exchanger 134, and the second heat exchanger 136 are all disposed in the return air passage 120. The first heat exchanger 134 is disposed close to the air outlet 113, and the second heat exchanger 136 is disposed close to the return air inlet 114;

[0064] A heat pump passage 150, a circulation pump 152, and a third heat exchanger 154. The heat pump passage 150 communicates with the water outlet 115 and the water return port 116. The circulation pump 152 and the third heat exchanger 154 are disposed in the heat pump passage 150;

[0065] A compressor 160. The outlet 164 of the compressor 160 is connected to the first heat exchanger 134 and the third heat exchanger 154, and the inlet 162 of the compressor 160 is connected to the second heat exchanger 136 or the first heat exchanger 134.

[0066] The throttling device 140 as described above can be disposed between any two of the first heat exchanger 134, the second heat exchanger 136, and the third heat exchanger 154. That is, the throttling device 140 can be disposed between the first heat exchanger 134 and the second heat exchanger 136, can also be disposed between the first heat exchanger 134 and the third heat exchanger 154, and can also be disposed between the second heat exchanger 136 and the third heat exchanger 154.

[0067] Among them, the housing 110 is the main body of the entire tableware treatment device 100 and the installation foundation of the entire tableware treatment device 100. It can provide an installation foundation for other components of the tableware treatment device 100 and can also play a certain protective role for other components of the tableware treatment device 100.

[0068] The accommodating cavity 112 is mainly used to accommodate tableware. Multiple layers of bowl baskets can be arranged in the accommodating cavity 112. Tableware can be placed on the bowl baskets, and the distances between the bowl baskets can be different, so as to place tableware of different models.

[0069] The return air channel 120 is connected to the air outlet 113 and the return air inlet 114 to form a drying branch. After the tableware is cleaned, the tableware can be dried through the return air channel 120. The heat pump channel 150 is mainly used to heat the washing water, and the washing water is sprayed on the tableware to achieve the purpose of cleaning the tableware.

[0070] In some embodiments, the throttling device 140 is disposed between the first heat exchanger 134 and the second heat exchanger 136. The input point 146b of the throttling device 140 is connected to the first heat exchanger 134, and the input point 146b of the throttling device 140 is connected to the second heat exchanger 136.

[0071] In some embodiments, the throttling device 140 is disposed between the third heat exchanger 154 and the first heat exchanger 134 or the second heat exchanger 136. The input point 146b of the throttling device 140 is connected to the third heat exchanger 154, and the output point 146c of the throttling device 140 is connected to the first heat exchanger 134 or the second heat exchanger 136.

[0072] In some embodiments, the air outlet 113 and the return air inlet 114 are disposed on the same side of the housing 110. This can facilitate the layout of the return air channel 120, reduce the occupied space of the return air channel 120, and at the same time enable the entire tableware treatment device 100 to be more compact, and use more space to accommodate tableware to improve the capacity of the tableware treatment device 100.

[0073] In some embodiments, the return air duct 120 is provided with an air inlet 121 and an air outlet 123. The air inlet 121 is disposed between the first heat exchanger 134 and the air outlet 113, and the air outlet 123 is disposed between the second heat exchanger 136 and the return air outlet 114. Under the condition that the circulation pump 152 is started, the air inlet 121 and the air outlet 123 are opened, and the air outlet 113 and the return air outlet 114 are closed.

[0074] Please refer to Figure 4 and Figure 5 , when the heat pump system of the tableware treatment device 100 operates, the circulation pump 152 is started. One of the first heat exchanger 134 and the second heat exchanger 136 acts as an evaporator, and the other does not operate. Then, the air in the return air duct 120 is cold air. To prevent the cold air from entering the accommodation chamber 112, the air outlet 113 and the return air outlet 114 can be closed. That is, under the condition that the circulation pump 152 is started, the air inlet 121 and the air outlet 123 are opened, so that the external air can enter the return air duct 120, exchange heat with the first heat exchanger 134 or the second heat exchanger 136, and then be discharged from the air outlet 123.

[0075] Since both the first heat exchanger 134 and the second heat exchanger 136 may act as evaporators, the air outlet 123 should be disposed between the second heat exchanger 136 and the return air outlet 114. That is, the air inlet 121 is disposed close to the air outlet 113, and the air outlet 123 is disposed close to the return air outlet 114.

[0076] In some embodiments, the tableware treatment device 100 further includes a first air valve 125. The first air valve 125 is disposed between the air outlet 113 and the air inlet 121. The first air valve 125 can connect the air outlet 113 with the return air duct 120 and disconnect the air inlet 121 from the return air duct 120, or disconnect the air outlet 113 from the return air duct 120 and connect the air inlet 121 with the return air duct 120.

[0077] Since the air inlet 121 and the air outlet 113 are close in position, and the air outlet 113 and the air inlet 121 are not opened or closed simultaneously. During operation, either the air outlet 113 is opened and the air inlet 121 is closed, or the air outlet 113 is closed and the air inlet 121 is opened. Therefore, only one air valve can be provided to jointly control the air inlet 121 and the air outlet 113. The first air valve 125 is disposed between the air inlet 121 and the air outlet 113. When the entire tableware treatment device 100 is in the drying mode, the first air valve 125 opens the air outlet 113 and closes the air inlet 121, so that the humid and hot gas in the accommodation chamber 112 can enter the return air duct 120. When the entire tableware treatment device 100 is in the heat pump mode, the first air valve 125 closes the air outlet 113 and opens the air inlet 121.

[0078] In some embodiments, the tableware treatment device 100 further includes a second air valve 126. The second air valve 126 is disposed between the air outlet 123 and the air return port 114. The second air valve 126 can connect the air outlet 123 to the air return passage 120 and disconnect the air return port 114 from the air return passage 120, or can disconnect the air outlet 123 from the air return passage 120 and connect the air return port 114 to the air return passage 120.

[0079] Similarly, since the positions of the air return port 114 and the air outlet 123 are close, and the air return port 114 and the air outlet 123 are not opened or closed simultaneously. During operation, either the air outlet 123 is opened and the air return port 114 is closed, or the air outlet 123 is closed and the air return port 114 is opened. Therefore, only one air valve can be provided to jointly control the air return port 114 and the air outlet 123. The second air valve 126 is disposed between the air return port 114 and the air outlet 123. When the entire tableware treatment device 100 is in the drying mode, the second air valve 126 opens the air return port 114 and closes the air outlet 123, so that the dry and hot gas in the air return passage 120 can flow back into the accommodation. When the entire tableware treatment device 100 is in the heat pump mode, the second air valve 126 closes the air return port 114 and opens the air outlet 123, so that the dry and cold gas in the air return passage 120 is discharged from the air outlet 123 to the outside of the air return passage 120.

[0080] That is to say, when the entire tableware treatment device 100 is in the drying mode, the first air valve 125 opens the air outlet 113 and closes the air inlet 121, and the second air valve 126 opens the air return port 114 and closes the air outlet 123, so that the humid and hot gas in the accommodation can enter the air return passage 120 through the air outlet 113, and after being dried by the first heat exchanger 134 and the second heat exchanger 136, it forms dry and hot gas. The dry and hot gas in the air return passage 120 can flow back into the accommodation through the air return port 114. When the entire tableware treatment device 100 is in the heat pump mode, the first air valve 125 closes the air outlet 113 and opens the air inlet 121, and the second air valve 126 closes the air return port 114 and opens the air outlet 123. The external air enters the air return passage 120 through the air inlet 121, and after heat exchange through the first heat exchanger 134 or the second heat exchanger 136, it forms cold air. The dry and cold gas in the air return passage 120 is discharged from the air outlet 123 to the outside of the air return passage 120.

[0081] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0082] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0083] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present application. The scope of the present application is defined by the claims and their equivalents.

Claims

1. A throttling device is arranged between two heat exchangers, and is characterized in that, The throttling device includes: a plurality of throttling components, and each throttling component includes: a throttle valve and a control valve connected in series with the throttle valve; Among them, a plurality of the throttle valves are connected in series, and the control valve of at least one of the throttling components is connected in parallel with at least one of the other throttling components.

2. The throttling device according to claim 1, characterized in that, The throttling device includes a first throttling component and a second throttling component. The first throttling component includes a first throttle valve and a first control valve, and the second throttling component includes a second throttle valve and a second control valve. The first control valve is connected in series with the first throttle valve, and the second control valve is connected in series with the second throttle valve. The second control valve is simultaneously connected in parallel with the first throttle valve and the first control valve.

3. The throttling device according to claim 2, characterized in that, The first control valve, the first throttle valve, and the second throttle valve are connected in sequence. There is a first connection point between the first throttle valve and the second throttle valve, and one end of the second control valve is connected to the first connection point.

4. The throttling device according to claim 3, characterized in that, One end of the second control valve away from the first connection point is connected to a section of the first control valve away from the first throttle valve, and an input point is formed. One end of the second throttle valve away from the first throttle valve forms an output point.

5. The throttling device according to claim 2, characterized in that, The first throttle valve is connected in series with the second throttle valve.

6. A tableware treatment device, characterized in that, It includes: a housing having a receiving cavity, an air outlet, a return air inlet, a water outlet, and a water return inlet communicating with the receiving cavity. The receiving cavity is used to receive tableware; a return air passage, a fan, a first heat exchanger, and a second heat exchanger. The return air passage communicates with the air outlet and the return air inlet. The fan, the first heat exchanger, and the second heat exchanger are all arranged in the return air passage. The first heat exchanger is arranged close to the air outlet, and the second heat exchanger is arranged close to the return air inlet; a heat pump passage, a circulation pump, and a third heat exchanger. The heat pump passage communicates with the water outlet and the water return inlet. The circulation pump and the third heat exchanger are arranged in the heat pump passage; a compressor. The outlet of the compressor is connected to the first heat exchanger and the third heat exchanger, and the inlet of the compressor is connected to the second heat exchanger or the first heat exchanger; The throttling device according to any one of claims 1-5 is arranged between any two of the first heat exchanger, the second heat exchanger, and the third heat exchanger.

7. The tableware treatment device according to claim 6, characterized in that, The throttling device is arranged between the first heat exchanger and the second heat exchanger. The input point of the throttling device is connected to the first heat exchanger, and the input point of the throttling device is connected to the second heat exchanger.

8. The tableware treatment device according to claim 6, characterized in that, The throttling device is arranged between the third heat exchanger and the first heat exchanger or the second heat exchanger. The input point of the throttling device is connected to the third heat exchanger, and the output point of the throttling device is connected to the first heat exchanger or the second heat exchanger.

9. The tableware treatment device according to any one of claims 6 - 8, characterized in that, The air outlet and the return air inlet are arranged on the same side of the housing.

10. The tableware treatment device according to any one of claims 6 - 8, characterized in that, The return air passage is provided with an air inlet and an air outlet. The air inlet is arranged between the first heat exchanger and the air outlet, and the air outlet is arranged between the second heat exchanger and the return air inlet. Under the condition that the circulation pump is started, the air inlet and the air outlet are opened, and the air outlet and the return air inlet are closed.

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