CN109419470B - Heat pump type dish washing machine control method and heat pump type dish washing machine - Google Patents
Heat pump type dish washing machine control method and heat pump type dish washing machine Download PDFInfo
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- CN109419470B CN109419470B CN201710750089.7A CN201710750089A CN109419470B CN 109419470 B CN109419470 B CN 109419470B CN 201710750089 A CN201710750089 A CN 201710750089A CN 109419470 B CN109419470 B CN 109419470B
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L15/00—Washing or rinsing machines for crockery or tableware
- A47L15/14—Washing or rinsing machines for crockery or tableware with stationary crockery baskets and spraying devices within the cleaning chamber
- A47L15/16—Washing or rinsing machines for crockery or tableware with stationary crockery baskets and spraying devices within the cleaning chamber with rigidly-mounted spraying devices
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L15/00—Washing or rinsing machines for crockery or tableware
- A47L15/0018—Controlling processes, i.e. processes to control the operation of the machine characterised by the purpose or target of the control
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L15/00—Washing or rinsing machines for crockery or tableware
- A47L15/42—Details
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L15/00—Washing or rinsing machines for crockery or tableware
- A47L15/42—Details
- A47L15/4285—Water-heater arrangements
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L15/00—Washing or rinsing machines for crockery or tableware
- A47L15/42—Details
- A47L15/48—Drying arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
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- Washing And Drying Of Tableware (AREA)
Abstract
The invention discloses a control method of a heat pump type dish washing machine and the heat pump type dish washing machine, wherein the dish washing machine heats washing water by using a heat pump, and comprises a heat pump working medium loop and a washing water channel, the heat pump working medium loop comprises a heat exchange device, and the heat pump working medium loop and the washing water channel exchange heat through the heat exchange device to heat the washing water; the control method comprises the step of controlling the heat pump working medium loop to be started before the washing water starts to circulate in the heat exchange device when the heat pump type dish washing machine starts to heat the washing water. The invention optimizes the starting process of the heat pump type dish washing machine, so that the pressure drop of the condenser and the evaporator of the heat pump system is not too large, and the circulation volume of the working medium of the heat pump system keeps normal flow, thereby being beneficial to the rapid rise of the load of the heat pump, and the lubricating oil discharged along with the working medium of the heat pump can be circulated back to the compressor for supplement in time when the compressor is started, thereby providing good lubrication for the compressor and prolonging the service life of the compressor.
Description
Technical Field
The invention belongs to the field of kitchen equipment, and particularly relates to a control method of a heat pump type dish washing machine and the heat pump type dish washing machine.
Background
The dish washer is used for automatically cleaning tableware such as dish, chopsticks, dish, knife and fork, and can be divided into two types of box type and conveying type according to the structure. It reduces the labor intensity for the cooking personnel in dining room, hotel and dining room of office, improves the working efficiency and promotes the cleanness and sanitation. At present, various small dishwashers are on the market, and are gradually entering ordinary households.
The existing dish washer uses a heating pipe to supply water to the dish washer, the heating pipe is arranged in a water tank at the bottom of an inner container, and when in washing, the heating pipe is used for heating, and a circulating water pump is used for circulating water to wash dishes. However, this method consumes much power and does not dry thoroughly.
In order to solve the problems, some dish washing machines adopting other heating modes exist at present, for example, the Chinese utility model patent with the application number of 201420465616.1 and the name of heat pump type dish washing machine provides a heat pump type dish washing machine, which comprises an inner container, a compressor, a condenser, a throttling device and an evaporator, wherein the condenser is arranged close to the outer wall of the inner container; the outlet of the compressor is connected with the inlet of the condenser, the outlet of the condenser is connected with the inlet of the evaporator through the throttling device, and the outlet of the evaporator is connected with the inlet of the compressor. The utility model discloses an energy resource consumption when saving the washing, the heat pump system that mainly comprises compressor, condenser, throttling arrangement and evaporimeter imbeds in the dish washer adopts copper pipe or aluminum pipe as heat pump system's condenser, closely pastes or twines the setting at the inner bag outer wall. The utility model discloses a having changed the mode that current dish washer adopted the heating pipe heating, having used heat pump system to the dish washer field, opened a brand-new heating and drying mode, very big reduction the consumption of the energy, and have better user experience.
However, in the conventional heat pump dishwasher, when heating the washing water, the washing water circuit cycle and the heat pump working medium circuit cycle of the heat pump are usually simultaneously started, and the start sequence of the compressor, the fan and the circulating water pump is not specified. Because the heat exchange between the heat pump system and the system heat exchange device is the unheated washing water in the initial operation stage of the heat pump system, if the circulating water pump is started at the moment, the condensation effect in the heat exchange device is increased, the condensation pressure of the heat pump system is lower, the evaporation pressure is further reduced, and the suction pressure of the compressor is reduced. When the compressor operates in the initial stage, the suction pressure of the compressor is too low, the circulation volume of the working medium of the heat pump is too small, and the load of the heat pump is not rapidly increased. And the suction pressure of the compressor is too low, and the lubricating oil discharged along with the working medium of the heat pump cannot be circulated back to the compressor for supplement when the compressor is started, so that the lubrication of the compressor is poor, and the service life of the compressor is influenced.
The present invention has been made in view of this situation.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a control method of a heat pump type dish washing machine and the heat pump type dish washing machine, wherein the starting process of the heat pump type dish washing machine is optimized, so that the pressure drop of a condenser and an evaporator of a heat pump system is not too large, the circulation quantity of a heat pump working medium of the heat pump system is kept at a normal flow, the rapid rise of the load of a heat pump is facilitated, lubricating oil discharged along with the heat pump working medium when a compressor is started can be circulated back to the compressor for supplement in time, good lubrication is provided for the compressor, and the service life of the compressor is prolonged.
In order to realize the purpose, the invention adopts the following technical scheme:
a control method of a heat pump type dish washing machine is characterized in that the dish washing machine heats washing water by using a heat pump and comprises a heat pump working medium loop and a washing water channel, wherein the heat pump working medium loop comprises a heat exchange device, and the heat pump working medium loop and the washing water channel exchange heat through the heat exchange device to heat the washing water; the control method comprises the step of controlling the heat pump working medium loop to be started before the washing water starts to circulate in the heat exchange device when the heat pump type dish washing machine starts to heat the washing water.
Furthermore, a compressor, a condenser, a throttling device and an evaporator which are mutually connected to form the heat pump working medium loop are arranged in the heat pump working medium loop; when the dishwasher heats the washing water, the starting time of the compressor is controlled to be earlier than the time when the washing water enters the heat exchange device.
Furthermore, a circulating water pump is arranged on the washing water circuit and drives the washing water to enter the heat exchange device, and when the washing water is heated by the dishwasher, the starting time of the compressor is controlled to be earlier than that of the circulating water pump.
And further, after the flow of the heat pump working medium in the heat pump working medium loop reaches the requirement of heating the washing water, the circulating water pump is started.
And further, the starting time of the compressor is controlled to be earlier than the starting time t seconds of the circulating water pump, and the flow of the heat pump working medium in the heat pump working medium loop meets the requirement of heating the washing water after the compressor is started for t seconds.
Further, the evaporator is also provided with a fan for accelerating heat exchange between the evaporator and the outside, and the starting time of the fan is controlled to be earlier than that of the compressor.
Further, the heat exchange device of the heat pump working medium loop is a condenser.
Furthermore, a compressor, a condenser, a throttling device and an evaporator which are mutually connected to form the heat pump working medium loop are arranged in the heat pump working medium loop, and the evaporator is also provided with a fan; a circulating water pump is arranged on the washing water circuit; the heating of the washing water of the dishwasher comprises the following steps in sequence:
s1, starting a fan of the evaporator;
s2, starting a compressor of the heat pump working medium loop;
and S3, after the time interval t seconds, starting a circulating water pump of the washing water waterway.
When the heat pump dishwasher starts to heat washing water, a heat pump working medium loop is started before the washing water starts to circulate in a heat exchange device.
Further, the dishwasher also comprises a heating device, the heating device is positioned on the washing water circuit, and the auxiliary heat pump heats the washing water; the starting time of the heating device is later than the cycle starting time of the heat pump working medium loop.
After the technical scheme is adopted, compared with the prior art, the invention has the following beneficial effects.
According to the control method of the heat pump type dish washing machine and the heat pump type dish washing machine, the starting process of the heat pump type dish washing machine is optimized, the condensing pressure of the heat exchange device at the initial stage of starting the heat pump is weakened, the pressure drop of the condenser and the evaporator of the heat pump system is not too large, the circulation quantity of the heat pump working medium of the heat pump system is kept at a normal flow, the rapid rising of the load of the heat pump is facilitated, the lubricating oil discharged along with the heat pump working medium when the compressor is started can be circulated back to the compressor in time for supplementing, good lubrication is provided for the compressor, and the service life of the compressor is prolonged.
The method solves the problem of low heating efficiency in the initial starting stage of the conventional heat pump type dish washing machine by optimizing the starting stage of the heat pump type dish washing machine, does not need to structurally adjust the heat pump type dish washing machine, only needs to change the starting control program of the dish washing machine, can be easily realized by upgrading control software or improving a control device, and is simple and convenient to deploy.
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without limiting the invention to the right. It is obvious that the drawings in the following description are only some embodiments, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
FIG. 1 is a schematic diagram of a heat pump dishwasher control method of the present invention;
fig. 2 is a schematic diagram of a heat pump dishwasher according to the present invention.
In the figure: 1. a water inlet valve; 2. a respirator; 3. draining pump; 4. a water circulating pump; 5. a fan; 6. an evaporator; 7. a compressor; 8. a throttling device; 9. a condenser; 10. an electric heater; 11. and (4) a spray pump.
It should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but to illustrate it by a person skilled in the art with reference to specific embodiments.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the following embodiments are used for illustrating the present invention and are not intended to limit the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in figures 1 and 2, the invention discloses a heat pump type dish washing machine control method and a heat pump type dish washing machine, the dish washing machine heats washing water by using a heat pump, and comprises a heat pump working medium loop and a washing water path, the heat pump working medium loop comprises a heat exchange device, and the heat pump working medium loop and the washing water path exchange heat through the heat exchange device to heat the washing water; the control method comprises the step of controlling a working medium loop of the heat pump to be started before washing water enters the heat exchange device for circulation when the heat pump type dish washing machine starts to heat the washing water. The invention weakens the condensation pressure of the heat exchange device at the initial stage of the heat pump starting by optimizing the starting process of the heat pump type dish washing machine, so that the pressure drop of the condenser and the evaporator of the heat pump system is not too large, the heat pump working medium circulation quantity of the heat pump system is kept at normal flow, the quick rise of the load of the heat pump is facilitated, the lubricating oil discharged along with the heat pump working medium can be circulated back to the compressor for supplement in time when the compressor is started, good lubrication is provided for the compressor, and the service life of the compressor is prolonged.
Example 1
As shown in fig. 1 and 2, the present embodiment discloses a heat pump dishwasher control method. The control method in the embodiment comprises the step of controlling the heat pump working medium loop to be started before the washing water starts to circulate in the heat exchange device when the heat pump type dish washing machine starts to heat the washing water.
As shown in fig. 2, the heat pump system of the present embodiment includes a heat pump working medium circuit connected to each other: throttling device 8, evaporator 6, compressor 7, condenser 9. The working principle of the heat pump system is that energy transfer is realized through gas-liquid state conversion of a heat pump working medium, specifically, high-pressure heat pump working medium steam discharged by a compressor 7 flows into a condenser 9, the heat pump working medium steam is condensed to release latent heat, the condensed liquid heat pump working medium flows through a throttling device 8 to enter an evaporator 6, the evaporator 6 absorbs external heat to evaporate, the evaporated steam is sucked by the compressor, and heating circulation is completed.
The heat exchanger of the invention is to directly utilize the latent heat released by the condenser 9 to heat the washing water, and the specially designed condenser is directly used as the heat exchanger of the heat pump system. The condenser 9 of the present invention is a double pipe heat exchanger including an inner pipe and an outer pipe, the inner pipe is communicated with a washing water path, and the outer pipe is communicated with a heat pump working medium. When the washing water flows through the inner tube of the double pipe heat exchanger, the heat pump working medium in the pipe of the condenser 9 releases latent heat, heating the washing water in the inner tube. The circulating water pump 4 on the washing water waterway drives the washing water to flow in the washing water waterway, thereby realizing the heating of the washing water in the dish washer.
Because the unheated washing water is used for exchanging heat with the system heat exchange device in the initial operation stage of the heat pump system, the temperature of the washing water is lower at the moment. If the circulating water pump 4 is started at this moment, the washing water enters the condenser to absorb heat from the condenser, and then the condensation effect of the double-pipe heat exchanger is increased. At the moment, the pressure of the condenser of the heat pump system is lower, so that the evaporation pressure is reduced, and finally the heat pump working medium circulation volume of the heat pump system is reduced. When the compressor is in initial operation, the suction pressure of the compressor 7 is too low, the circulation amount of the working medium of the heat pump is too small, and the load of the heat pump is not rapidly increased. And when the compressor 7 is started, the lubricating oil discharged along with the working medium of the heat pump cannot be circulated back to the compressor 7 for supplement in time, so that the lubrication of the compressor is poor, and the service life of the compressor is influenced
Therefore, in this embodiment, when the dishwasher heats the washing water, the compressor 7 is controlled to be started earlier than the time when the washing water enters the heat exchanging device.
In this embodiment, the circulating water pump 4 drives the washing water to enter the heat exchanging device, i.e. the condenser 9, in order to achieve the control effect of the present invention, that is, when the dishwasher heats the washing water, the start time of the compressor 7 is controlled to be earlier than the start time of the circulating water pump 4, so as to achieve the purpose of controlling the heat pump working medium loop to start circularly before the washing water enters the heat exchanging device.
In this embodiment, no other device for assisting in testing the flow rate of the working medium of the heat pump is used, so that in order to further achieve the optimal heating effect, the start time of the compressor 7 and the start time of the circulating water pump 4 are sufficiently spaced, and the circulating water pump is turned on after the flow rate of the working medium of the heat pump in the working medium circuit of the heat pump meets the requirement of heating the washing water.
Specifically, in this embodiment, the start time of the compressor 7 is controlled to be earlier than the start time t seconds of the circulating water pump 4, and the heat pump working medium loop meets the requirement that the flow rate of the heat pump working medium meets the requirement of heating the washing water after the compressor is started for t seconds. the value t is an optimal value obtained through calculation and experiments, namely in the period of t seconds, when the heat pump system is in a no-load condition without washing water heating, the compressor 7 is started so as to start the circulation of the heat pump working medium, the flow of the heat pump working medium is gradually increased from 0 to an optimal flow state, and the working efficiency of the heat pump is optimal.
In this embodiment, t is a number between 0.1 and 180, obtained from calculation and experimental data.
Example 2
This embodiment is a supplement to embodiment 1, and as shown in fig. 2, in this embodiment, the evaporator 6 is further provided with a fan 5, and the fan 5 is used for accelerating heat exchange between the evaporator and the outside. Also in order to improve the heat pump heating efficiency at the initial stage of the start-up of the heat pump dishwasher, the present embodiment further controls the start-up time of the fan 5 to be earlier than the start-up time of the compressor 7, in addition to the above-described control process. The fan 5 is controlled to be started firstly, so that the heat exchange quantity of the evaporator 6 is increased when the heat pump system operates, the evaporation temperature is increased, and the load of the compressor 7 is increased rapidly.
Example 3
This embodiment is an implementation procedure of the heat pump dishwasher control method combining embodiment 1 and embodiment 2.
In this embodiment, as shown in fig. 2, a compressor 7, a condenser 9, a throttling device 8 and an evaporator 6 which are connected with each other to form the heat pump working medium circuit are arranged in the heat pump working medium circuit, and the evaporator 6 is further provided with a fan 5; and a circulating water pump 4 is arranged on the washing water circuit.
As shown in fig. 1, the heating of the washing water of the dishwasher sequentially comprises the steps of:
s1, starting a fan of the evaporator;
s2, starting a compressor of the heat pump working medium loop;
and S3, after the time interval t seconds, starting a circulating water pump of the washing water waterway.
Example 4
This embodiment is to heat transfer device's in above-mentioned embodiment supplementary, and heat transfer device is not the condenser in this embodiment to directly heat washing water through the condenser, but other heat transfer equipment that can realize carrying out the heat exchange with washing water through condenser drive realize.
In the embodiment, when the heat pump type dishwasher starts to heat the washing water, the heat pump working medium loop is still controlled to be started before the washing water enters the heat exchange device for circulation. The significance of the embodiment is that: even if the heat exchange device is not a condenser, if the washing water starts to exchange heat with the heat pump system when the heat pump is not started, the condensation efficiency of the heat pump is still overlarge, the pressure of an evaporator and the condenser is too low, the suction pressure of a compressor is reduced, the working medium flow of the heat pump in a working medium circulation pipeline of the heat pump is insufficient, and the load of the heat pump is not rapidly increased. Therefore, no matter whether the heat exchange device for heating the washing water is a condenser or not, when the heat pump type dish washing machine starts to heat the washing water, the heat pump working medium loop is controlled to be circularly started before the washing water enters the heat exchange device.
Example 5
This embodiment is a supplement to the above embodiment for controlling the manner in which the washing water enters the heat exchange device.
In this embodiment, the washing water circuit is provided with a heat exchange valve, and the heat exchange valve is used for controlling whether the washing water enters the heat exchange device or not. The heat exchange device has larger capacity, namely the heat exchange device can be a water tank type heat exchange device. After the washing water enters the heat exchange device through the heat exchange valve, the heat exchange valve is closed, the washing water is stored in the heat exchange device, and the washing water is heated for the washing water in the heat exchange device through continuous circulation of the working medium of the heat pump. And when the washing water reaches the preset temperature, controlling to open the heat exchange valve to discharge the washing water out of the heat exchange device. In this embodiment, the control of the washing water entering the heat exchanging device is not the circulating water pump in the above embodiment, but is realized by the heat exchanging valve, so in this embodiment, the operation method of the heat pump dishwasher is as follows: the starting time of the compressor is controlled to be earlier than the opening time of the heat exchange valve, and the starting time of the compressor is controlled to be earlier than the time of the washing water entering the heat exchange device when the washing water is heated by the dish washing machine.
Example 6
The present embodiment is a supplement to the above embodiments in a control manner for controlling the flow rate of the heat pump working medium in the heat pump working medium circuit to meet the requirement of heating the washing water.
In the above embodiment, the starting time of the compressor is set to be earlier than the starting time t seconds of the circulating water pump, so that the purpose that the flow rate of the working fluid of the heat pump meets the requirement of heating the washing water when the washing water enters the heat exchange device is achieved. In this embodiment, the time interval t is not defined as in the above-mentioned embodiment, but the above-mentioned technical effect is achieved by direct heat pump working medium flow monitoring and corresponding control means,
in this embodiment, a heat pump working medium flow monitoring device is disposed on the heat pump working medium circuit, and the technical effect is achieved by monitoring the heat pump working medium flow and controlling the on-time of the compressor according to the monitoring result. Specifically, the dishwasher of the embodiment is provided with a control device and a heat pump working medium flow monitoring device, the heat pump working medium flow monitoring device monitors the flow of a heat pump working medium in a heat pump working medium loop in real time, and the control device controls a washing water channel according to a monitoring result of the heat pump working medium flow monitoring device.
In the embodiment, when the washing water is heated, the heat pump working medium loop is still controlled to be started before the washing water enters the circulation state, but only when the flow of the heat pump working medium in the heat pump system reaches the requirement of meeting the washing water heating requirement, the control device opens the washing water waterway to enable the washing water to enter the heat exchange device.
Example 7
As shown in fig. 2, the present embodiment discloses a heat pump dishwasher employing the control method of the heat pump dishwasher as described in any one of the above embodiments. Comprises a processing chamber; the treatment chamber is internally provided with a spraying port, and the spraying port sprays and cleans the tableware in the treatment chamber through the washing water provided by the washing water waterway. The washing water waterway is connected with a water inlet valve 1, a respirator 2, a drainage pump 3, a circulating water pump 4 and a spraying port. Washing water enters a washing water waterway through the water inlet valve 1 and flows into a treatment chamber with tableware, the washing water circularly flows in the washing water waterway through the circulating water pump 4 and is sprayed onto the tableware through a spraying port to clean the tableware, dirty water is discharged through the drainage pump 3 after the washing is finished, and the respirator 2 is used for preventing siphoning of the washing water waterway.
The invention heats the washing water through the heating system in order to improve the cleaning effect of the dish-washing machine. The heating system comprises a heat pump system. As shown in fig. 2, the heat pump system comprises a heat pump working medium circuit connected with each other: throttling device 8, evaporator 6, compressor 7, condenser 9. The working principle of the heat pump system is that energy transfer is realized through gas-liquid state conversion of a heat pump working medium, specifically, high-pressure heat pump working medium steam discharged by a compressor 7 flows into a condenser 9, the heat pump working medium steam is condensed to release latent heat, the condensed liquid heat pump working medium flows through a throttling device 8 to enter an evaporator 6, the evaporator 6 absorbs external heat to evaporate, the evaporated steam is sucked by the compressor 7, and heating circulation is completed.
The present invention heats the washing water by using the latent heat released from the condenser 9. The condenser 9 of the present invention is a double pipe heat exchanger including an inner pipe and an outer pipe, the inner pipe is communicated with a washing water path, and the outer pipe is communicated with a heat pump working medium. When the washing water flows through the inner tube of the double pipe heat exchanger, the heat pump working medium in the pipe of the condenser 9 releases latent heat, heating the washing water in the inner tube. The circulating water pump 4 on the washing water waterway drives the washing water to flow in the washing water waterway, thereby realizing the heating of the washing water in the dish washer. When the heat pump type dish washing machine starts to heat washing water, the heat pump working medium loop is circularly started before the washing water enters the heat exchange device.
The evaporator 6 of the present embodiment is further provided with a fan 5, which fan 5 drives air outside the dishwasher housing into the housing in an induced draft manner, which allows a relatively even distribution of air through the evaporator. The wind drawn by the fan 5 passes through the compressor 7 and the evaporator 6 in sequence along a relatively closed path. The air passes through the compressor 7 firstly, can absorb the heat that the compressor 7 surface produced, and the temperature risees, promotes the heat transfer difference in temperature of air in evaporimeter 6 department to improve the heat absorption effect of evaporimeter 6. The dishwasher in this embodiment further controls the start time of the fan to be earlier than the start time of the compressor.
Meanwhile, as shown in fig. 2, the dishwasher in this embodiment further includes a heating device, which is located on the washing water circuit and assists the heat pump to heat the washing water; preferably, the heating means is an electric heater 10 consisting of an electric heating tube. The heating device is used for solving the problem of waiting for using hot water by a user due to the lower heating efficiency of the heat pump system.
In this embodiment, when the heating efficiency of the heat pump system cannot meet the requirement, the electric heater 10 is started, and the heating mode combining the two modes is adopted to increase the heating speed of the washing water or the temperature of the washing water. The dish washer preferentially uses the heat pump heating system because the electric heating mode has the problems of high energy consumption and low heat conversion rate compared with the heating mode of the heat pump, and the electric heater 10 is used as an auxiliary heating means, so the starting time of the electric heater 10 is later than the cycle starting time of the heat pump working medium loop.
Example 8
The present embodiment is a supplement to the heat pump dishwasher control method in the above-described embodiments. In this embodiment, the washing water path is a circulation loop, and the washing water is heated by flowing through the heat exchanger during heating. When the heat pump type dish washing machine starts to heat the washing water, the heat pump working medium loop is controlled to be started before the washing water starts to circulate in the heat exchange device. In this embodiment, at the initial stage of heating, the heat exchanger already has the washing water therein, but the circulation pump on the washing water path is turned on after the heat pump working medium circuit is started, that is, although a part of the washing water is stored in the heat exchanger before the heat pump working medium circuit is started, the washing water flows in the heat exchanger only after the heat pump working medium circuit is started.
Since the amount of the washing water in the heat exchange device is small previously, the operation efficiency of the heat pump system is not so much affected, and a large amount of heat absorption process is performed only when the washing water circulates in the heat exchange device. According to the control process of the invention, after the heat pump system is started, the washing water circulates in the heat exchange device, so that the pressure drop of the condenser and the evaporator of the heat pump system is not too large, thereby being beneficial to the rapid rise of the load of the heat pump.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A control method of a heat pump type dish washing machine is characterized in that the dish washing machine heats washing water by using a heat pump and comprises a heat pump working medium loop and a washing water channel, wherein the heat pump working medium loop comprises a heat exchange device, and the heat pump working medium loop and the washing water channel exchange heat through the heat exchange device to heat the washing water; the control method is characterized in that when the heat pump type dish washing machine starts to heat washing water, the heat pump working medium loop is controlled to be started before the washing water starts to circulate in the heat exchange device.
2. A heat pump dishwasher control method according to claim 1, characterized in that the heat pump working medium circuit is provided therein with a compressor, a condenser, a throttling means and an evaporator which are connected to each other to constitute the heat pump working medium circuit; when the dishwasher heats the washing water, the starting time of the compressor is controlled to be earlier than the time when the washing water enters the heat exchange device.
3. A heat pump dishwasher control method according to claim 2, wherein a circulation water pump is provided in the washing water circuit, the circulation water pump drives the washing water into the heat exchanging device, and the dishwasher controls the start time of the compressor to be earlier than the start time of the circulation water pump when heating the washing water.
4. A heat pump dishwasher control method according to claim 3, characterized by controlling the circulating water pump to be switched on again after the heat pump working medium flow in the heat pump working medium circuit has reached a requirement for heating the washing water.
5. A heat pump dishwasher control method according to claim 4, characterized in that the start-up time of the compressor is controlled to be earlier than the start-up time of the circulating water pump by t seconds, and after the start-up of the compressor by t seconds, the flow rate of the heat pump working medium in the heat pump working medium circuit is up to the requirement for heating the washing water.
6. A heat pump dishwasher control method according to claim 5, wherein the evaporator is further provided with a fan for accelerating heat exchange with the outside, and a start time of the fan is controlled to be earlier than a start time of the compressor.
7. A heat pump dishwasher control method according to claim 3, characterized in that the heat exchanging means of the heat pump working medium circuit is a condenser; when the heat pump type dish washing machine starts to heat washing water, the heat pump working medium loop is controlled to be circularly started before the washing water enters the condenser.
8. A heat pump dishwasher control method according to any one of claims 1 to 7, characterized in that the heat pump working fluid circuit is provided with a compressor, a condenser, a throttle device and an evaporator which are connected to form the heat pump working fluid circuit, the evaporator being further provided with a fan; a circulating water pump is arranged on the washing water circuit; the heating of the washing water of the dishwasher comprises the following steps in sequence:
s1, starting a fan of the evaporator;
s2, starting a compressor of the heat pump working medium loop;
and S3, after the time interval t seconds, starting a circulating water pump of the washing water waterway.
9. A heat pump dishwasher having a method according to any of claims 1-8, characterized in that the heat pump dishwasher is started with the heat pump working medium circuit before the washing water starts to circulate in the heat exchanger when the heat pump dishwasher starts to heat the washing water.
10. A heat pump dishwasher according to claim 9, further comprising a heating device located on the wash water circuit to assist the heat pump in heating the wash water; the starting time of the heating device is later than the cycle starting time of the heat pump working medium loop.
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| CN109864682A (en) * | 2019-03-22 | 2019-06-11 | 珠海格力电器股份有限公司 | Drying process, drying device and the dish-washing machine of dish-washing machine |
| CN112022044A (en) * | 2019-06-04 | 2020-12-04 | 青岛海尔洗碗机有限公司 | Dish washing machine and control method |
| CN112022046A (en) * | 2019-06-04 | 2020-12-04 | 青岛海尔洗碗机有限公司 | Dish washer sleeve pipe heat transfer device and dish washer |
| CN112137546A (en) * | 2019-06-27 | 2020-12-29 | 青岛海尔洗碗机有限公司 | Dish washing machine |
| CN114016268B (en) * | 2021-11-19 | 2022-11-25 | 珠海格力电器股份有限公司 | Clothes treatment equipment with heat pump drying function and control method |
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