CN109199298B - Dehumidification drying device and dish washer - Google Patents

Abstract

The invention discloses a dehumidifying and drying device, which comprises an air inlet pipe, a membrane contactor and an air outlet pipe; the inlet end of the air inlet pipe is communicated with the inside of the closed box body to be dried, and the outlet end of the air inlet pipe is communicated with the tube side inlet of the membrane contactor; the tube side outlet of the membrane contactor is communicated with the inlet end of the air outlet tube, and the outlet end of the air outlet tube is communicated with the inside of the closed box body to be dried. On the basis, a dish washer comprising the dehumidifying and drying device is invented. According to the invention, the negative pressure of the negative pressure flow channel and the air pressure of the air flow channel are different to generate the air pressure difference, so that the water vapor in the air to be dehumidified in the air flow channel permeates the organic film and enters the negative pressure flow channel, and the purpose of removing the water vapor in the air flow channel is achieved.

Description

A dehumidification and drying device and a dishwasher

Technical field

The invention belongs to the technical field of washing equipment, and specifically relates to a dehumidifying and drying device and a dishwasher.

Background technique

Dishwasher makes people's life convenient, but many dishwashers cannot completely dry the dishes after the washing process is completed. After the undried tableware is left for a period of time, a small amount of residual sewage will produce odor in the dishwasher and even breed harmful microorganisms. When the user opens the dishwasher to take out the tableware, an unpleasant smell will be produced, resulting in a poor user experience. , affecting users’ health and mood.

In modern dishwasher dehumidification technology, the traditional dishwasher drying methods include natural drying through the residual heat of the inner tank, or drying by introducing hot air. However, natural air drying can easily lead to the proliferation of microorganisms due to the long drying time. It is also possible that water vapor can leave stains on the tableware because it is not dried in time. However, by introducing hot air, the air inlet method and the air duct structure prevent the hot air from filling the inner tank quickly, resulting in unsatisfactory drying effect and high energy consumption. For example: the Chinese invention patent application with announcement number CN 207477470 U discloses a dishwasher with internal circulation drying, which uses hot air drying. Although the dehumidification effect is better than natural air drying, the energy consumption is large and the dehumidification cost is relatively high. High, and it is easy to produce condensation. Finally, a large amount of water vapor will remain, nourishing bacteria and contaminating bowls.

Contents of the invention

In view of the above-mentioned deficiencies in the prior art, the present invention provides a dehumidification and drying device, aiming to solve the technical problems of long drying time, high consumption, incomplete dehumidification and drying, and high dehumidification cost in the prior art, and Correspondingly, a dishwasher is provided.

In order to achieve the above objects, the technical solutions adopted by the present invention are as follows:

A dehumidification and drying device, including an air inlet pipe, a membrane contactor and an air outlet pipe; the inlet end of the air inlet pipe is used to communicate with the inside of a closed box to be dried, and the outlet end of the air inlet pipe is connected to the membrane contactor The tube side inlet is connected; the tube side outlet of the membrane contactor is connected with the inlet end of the air outlet pipe, and the outlet end of the air outlet pipe is used to communicate with the inside of the closed box to be dried.

Further, a first valve is provided in the air inlet pipe, and a second valve is provided in the air outlet pipe, for introducing the moist air from the outlet end of the air inlet pipe in the box into the box when the first valve and the second valve are opened. The membrane contact dehumidification system. When in the non-dehumidifying drying mode, the first valve and the second valve are closed. When in the dehumidifying and drying membrane test, the first valve and the second valve are automatically opened.

Further, a fan is provided in the air inlet pipe between the first valve and the outlet end of the air inlet pipe for accelerating the introduction of humid air.

Furthermore, a vacuum pump is included, and the outlet of the vacuum pump is connected with the inlet of the shell side of the membrane contactor.

Further, an organic membrane is provided between the tube side and the shell side of the membrane contactor, and the organic membrane is made of PVDF, PTFE, PEG and/or NMP materials.

Furthermore, the membrane contactor has a flat rectangular structure and adopts a hollow fiber membrane contactor or a flat membrane contactor.

Furthermore, the hollow fiber membrane contactor adopts a counter-flow structure or a cross-flow structure.

Further, the inlet of the membrane contactor is connected to the outlet of the water pump, and the shell-side inlet of the membrane contactor is connected to the cold source through a condensed water drainage pipe, which is used to introduce the condensed water generated by the cold source into the shell side as a dehumidifier.

A dishwasher includes the above-mentioned dehumidifying and drying device.

Further, it also includes a closed box, the closed box includes an inner tank and an outer shell, the dehumidification and drying device is arranged between the inner tank and the outer shell, the shell side inlet of the membrane contactor and the shell side outlet of the membrane contactor located outside the housing.

Alternatively, the membrane contactor is arranged on the outer wall of the box.

The dehumidification and drying device of the present invention is not limited to dishwashers, but is also suitable for high-humidity closed spaces such as disinfection cabinets and storage boxes.

There is an organic membrane in the membrane contactor of the dishwasher of the present invention. One side of the organic membrane is a humidified air flow channel, and the other side is a negative pressure flow channel that is directly connected to the atmosphere or contains chilled water. Due to the negative pressure of the negative pressure flow channel, The difference between the air pressure and the air pressure in the air flow channel creates an air pressure difference. The pressure difference causes the water vapor in the air to be dehumidified in the air flow channel to pass through the organic film and enter the negative pressure flow channel, thereby achieving the purpose of removing water vapor in the air flow channel.

Compared with existing technology, the present invention has the following beneficial effects:

1. The dehumidification effect of the present invention is good. The dehumidification cycle uses the negative pressure generated by vacuuming or the condensed water discharged from the refrigerator. The pressure difference causes the water vapor in the moist air flow channel to penetrate the organic film and enter the negative pressure flow channel to achieve the removal of moisture in the air flow channel. Water vapor, high dehumidification efficiency.

2. The dishwasher of the present invention uses a membrane contactor for dehumidification, has a relatively simple structure, is easy to manufacture, forms an internal circulation, and does not pollute the air.

3. The dishwasher of the present invention does not need to pass in additional hot air during the drying process, which greatly reduces energy consumption.

Description of the drawings

Figure 1 is a schematic structural diagram of the dishwasher of the present invention;

Figure 2 is a schematic structural diagram of a dishwasher connected to a cold source;

Figure 3 is a schematic diagram of the counterflow structure of a vacuumed hollow fiber membrane contactor;

Figure 4 is a schematic diagram of the counterflow structure of the hollow fiber membrane contactor connected to the cold source;

Figure 5 is a schematic diagram of the cross-flow structure of the evacuated hollow fiber membrane contactor;

Figure 6 is a schematic diagram of the cross-flow structure of the hollow fiber membrane contactor connected to the cold source;

Figure 7 is a schematic structural diagram of a vacuumed flat membrane contactor;

Figure 8 is a schematic structural diagram of a flat membrane contactor connected to a cold source.

In the drawings: 1-air inlet pipe; 2-first valve; 3-fan; 4-membrane contactor; 5-vacuum pump; 6-air outlet pipe; 7-second valve; 8-water pump; 9-condensate drain pipe ; 10 - cold source; 11 - tube side inlet of membrane contactor; 12 - tube side outlet of membrane contactor; 13 - shell side inlet of membrane contactor; 14 - shell side outlet of membrane contactor.

Detailed ways

The present invention will be further described in detail below with reference to specific embodiments.

As shown in Figure 1, a dehumidification and drying device includes an air inlet pipe 1, a membrane contactor 4 and an air outlet pipe 6; the inlet end of the air inlet pipe 5 is used to communicate with the inside of a closed box to be dried, and the air inlet pipe 5 The outlet end of 5 is connected to the tube pass inlet 11 of the membrane contactor; the tube pass outlet 12 of the membrane contactor is connected to the inlet end of the air outlet pipe 6, and the outlet end of the air outlet pipe 6 is used to communicate with the Describe the internal communication of the closed box to be dried.

As an optimization, a first valve 2 is provided in the air inlet pipe 1, and a second valve 7 is provided in the air outlet pipe 6, for opening the air inlet pipe in the box when the first valve 2 and the second valve 7 are opened. The humidified air at the outlet end of 1 is introduced into the membrane contact dehumidification system. The first valve 2 and the second valve 7 are both automatic valves. When in the non-dehumidifying drying mode, the first valve and the second valve are closed. When in the dehumidifying and drying membrane test, the first valve and the second valve are automatically opened.

As an optimization, a fan 3 is also provided in the air inlet pipe 1 between the first valve 2 and the outlet end of the air inlet pipe 1 to speed up the introduction of humid air. Humid air refers to the air formed inside the dishwasher that contains a certain amount of water vapor.

As an optimization, a vacuum pump 5 is also included, and the outlet of the vacuum pump 5 is connected with the inlet 13 of the shell side of the membrane contactor.

As an optimization, an organic membrane is provided between the tube side and the shell side of the membrane contactor 4. The organic membrane is made of PVDF, PTFE, PEG and/or NMP materials, that is, it can be made of PVDF, PTFE, PEG and NMP. It can also be made from several materials mixed in a certain proportion.

As an optimization, the membrane contactor is a hollow fiber membrane contactor or a flat plate membrane contactor.

As an optimization, the hollow fiber membrane contactor adopts a counter-flow structure or a cross-flow structure.

As an optimization, the shell-side inlet 13 of the membrane contactor is connected to the outlet of the water pump 8, and the inlet of the water pump 8 is connected to the cold source 10 through the condensed water drain pipe 9, which is used to introduce the condensed water generated by the cold source 10 into the shell. used as a dehumidifier. as shown in picture 2. The cold source is usually a refrigerator or freezer.

A dishwasher includes the above-mentioned dehumidifying and drying device.

As an optimization, a closed box is also included. The closed box includes an inner tank and an outer shell. The dehumidifying and drying device is arranged between the inner tank and the outer shell. The shell side inlet of the membrane contactor and the shell side of the membrane contactor are The outlet is provided on the outside of the housing.

When the present invention is put into practical use, there are two specific application scenarios:

Scenario 1: As shown in Figure 1, the dishwasher adopts vacuum mode without cold source. When the drying mode is turned on, the first valve 2 and the second valve 7 are opened. Driven by the fan 3, the humid air generated after washing is transported from the air inlet pipe 1 to the tube side inlet 11 of the membrane contactor and enters the tube side. Under the action of the vacuum pump 5, the relatively dry air in the atmosphere enters the shell side of the membrane contactor from the shell side inlet 13 of the membrane contactor. Since the partial pressure of water vapor in the air in the 4th tube side of the membrane contactor is higher than the partial pressure of water vapor in the 4th shell side of the membrane contactor, under the action of the pressure difference, the water vapor in the tube side enters the shell side, and then It leaves from the shell side outlet 14 of the membrane contactor, thereby reducing the humidity of the air in the tube side and achieving the purpose of drying and dehumidification. Hollow fiber membrane contactors with counter-flow (as shown in Figure 3) or cross-flow (as shown in Figure 5) structures can achieve better drying and dehumidification effects. The dried and dehumidified air flows into the air outlet pipe 6 through the tube outlet 12 of the membrane contactor and flows back into the dishwasher, which continues to drive the air flow in the dishwasher, so that the moist air continuously flows into the membrane contact dehumidification system, continuously Performing dehumidification and drying will eventually reduce the air humidity inside the dishwasher to the ideal level, reducing drying time and saving energy consumption. After drying is completed, the first valve 2 and the second valve 7 are closed to keep the inside of the dishwasher closed to prevent external water vapor from entering and condensing to form secondary pollution. The hollow fiber membrane contactor in this scenario can also be replaced by a flat membrane contactor, as shown in Figure 7.

Scenario 2: As shown in Figure 2, the dishwasher uses a condensed water drying mode with a cold source. When the drying mode is turned on, the first valve 2 and the second valve 7 are opened, and the air inlet pipe 1 and the air outlet pipe 6 are opened. Driven by the fan 3, the humid air generated after washing is transported from the air inlet pipe 1 to the tube side inlet 11 of the membrane contactor and enters the tube side. Under the action of the water pump 8, the condensed water generated by the cold source 10 such as a refrigerator or freezer enters the shell side of the membrane contactor 4 from the shell side inlet 13 of the membrane contactor through the condensed water drain pipe 9. Since the partial pressure of water vapor in the air in the 4th tube side of the membrane contactor is higher than the partial pressure of condensed water vapor in the 4th shell side of the membrane contactor, the water vapor in the tube side enters into the shell side under the action of the pressure difference. , and then leaves from the outlet 14 of the shell side of the membrane contactor, thereby reducing the humidity of the air in the tube side and achieving the purpose of drying and dehumidification. Hollow fiber membrane contactors using counter-flow (Figure 4) or cross-flow (Figure 6) structures can achieve better drying and dehumidification effects. The dried and dehumidified air flows into the air outlet pipe 6 through the tube outlet 12 of the membrane contactor and flows back into the dishwasher, continuing to drive the air flow in the dishwasher, so that the moist air continuously flows into the membrane contact dehumidification system, continuously Performing dehumidification and drying will eventually reduce the air humidity inside the dishwasher to the ideal level, reducing drying time and saving energy consumption. After drying is completed, the first valve 2 and the second valve 7 are closed to keep the inside of the dishwasher closed to prevent external water vapor from entering and condensing to form secondary pollution. The hollow fiber membrane contactor in this embodiment can also be replaced by a flat membrane contactor, as shown in Figure 8.

The above-mentioned embodiments of the present invention are only examples for illustrating the present invention, and are not intended to limit the implementation of the present invention. For those of ordinary skill in the art, other different forms of changes and modifications can be made based on the above description. It is not possible to exhaustively list all possible implementations here. All obvious changes or modifications derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims (6)

1. The dehumidifying and drying device is characterized by comprising an air inlet pipe, a membrane contactor and an air outlet pipe; the inlet end of the air inlet pipe is communicated with the inside of the closed box body to be dried, and the outlet end of the air inlet pipe is communicated with the tube side inlet of the membrane contactor; the tube side outlet of the membrane contactor is communicated with the inlet end of the air outlet tube, and the outlet end of the air outlet tube is communicated with the inside of the closed box body to be dried;

the membrane contactor is of a flat rectangular structure, a hollow fiber membrane contactor is adopted, and the hollow fiber membrane contactor is of a countercurrent structure or a cross-flow structure;

a first valve is arranged in the air inlet pipe, a second valve is arranged in the air outlet pipe, and the first valve and the second valve are used for introducing moist air at the outlet end of the air inlet pipe in the box body into the membrane contact dehumidification system when the first valve and the second valve are opened;

an organic membrane is provided between the tube side and the shell side of the membrane contactor, the organic membrane being made of PVDF, PTFE, PEG and/or NMP material.

2. The dehumidifying and drying device as claimed in claim 1, wherein a blower is further provided in the air inlet pipe between the first valve and the outlet end of the air inlet pipe for accelerating the speed of introducing humid air.

3. The dehumidification drying apparatus of claim 1, further comprising a vacuum pump, an outlet of the vacuum pump in communication with an inlet of a shell side of the membrane contactor.

4. The dehumidifying and drying apparatus as claimed in claim 1, wherein an inlet of the shell side of the membrane contactor is communicated with an outlet of a water pump, and an inlet of the water pump is communicated with a cold source through a condensed water drain pipe for introducing condensed water generated from the cold source into the shell side as a dehumidifying agent.

5. A dishwasher, characterized by comprising a dehumidifying and drying device according to any one of claims 1 to 4.

6. The dishwasher of claim 5 further comprising a closed housing comprising an inner bladder and an outer shell, the desiccant drying device being disposed between the inner bladder and the outer shell, the shell side inlet of the membrane contactor and the shell side outlet of the membrane contactor being disposed outside the outer shell.