Dishwasher

Abstract

The present invention discloses a dishwasher, which includes a dishwasher body and a water level detection device installed in the dishwasher body. The dishwasher body includes a water cup housing, and the water cup housing is provided with a water storage cavity and an air cavity communicating with the lower part of the water storage cavity. The water level detection device includes a pressure switch device, a buffer valve arranged between the pressure switch device and the air cavity, and an air pipe that serially connects the air cavity, the buffer valve and the pressure switch device. The buffer valve includes a valve housing and a rubber diaphragm installed in the inner cavity of the valve housing in the gas passing direction. There is a first gap between the edge of the rubber diaphragm and the annular inner wall of the valve housing to allow air to pass through slowly. There is a second gap between one side surface of the rubber diaphragm and the air outlet part of the valve housing to enable the rubber diaphragm to be deformed under pressure to close the air outlet part when the air pressure increases abnormally and steeply.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and particularly to a dishwasher. Background Art

[0002] Nowadays, with the continuous improvement of people's living quality, household dishwashers have gradually become one of the essential household appliances. The water flow system of a household dishwasher is generally as follows: a water cup is provided at the bottom of the washing cavity, and in front of the water cup is a multi-stage filtering system; a water suction port is opened at a position below the middle of the side wall of the water cup, and the water suction port is connected to a circulation water pump, and the circulation water pump delivers water to each spray arm to form a spray cleaning of tableware. During the washing process, a certain amount of water needs to be stored in the washing cavity, but too much or too little water volume will have an adverse effect. Especially when too much water enters, after the water volume exceeds a certain level, it will overflow outside the dishwasher, which may further cause greater problems. Therefore, high water level protection is essential in a dishwasher.

[0003] The current high water level protection device adopts a pressure switch device. An air chamber is provided at the bottom of the washing cavity, and the air chamber and the water cup are connected at the lowest position. Therefore, when water enters the washing cavity, a certain amount of air will be sealed in the air chamber. An air outlet is provided at the top of the air chamber and is connected to the pressure switch through a hose, so that the pressure switch can sense the air pressure in the air chamber in real time; the higher the water level in the washing cavity, the greater the air pressure in the air chamber. When the air pressure reaches the set value of the pressure switch, the pressure switch will be triggered, and then the high water level protection measures will be started - stopping water intake and starting drainage until the water level in the washing cavity drops to an appropriate level.

[0004] However, the existing high water level protection device has problems in actual operation that the pressure switch device works unstably and is easily mis-triggered, resulting in the controller shutting down the water supply valve and unable to supply water normally. For example, when the dishwasher door is quickly closed, the air communication port between the inner cavity of the dishwasher and the atmosphere cannot quickly balance the air pressure, the air pressure in the inner cavity increases instantaneously, the air pressure is conducted to the water, and then conducted to the pressure switch device through the pipeline, resulting in a high water level electrical signal, and finally causing the controller to mis-shut down the water supply valve. Summary of the Invention

[0005] The object of the present invention is to provide a dishwasher, and its advantages are as follows: since the water level detection device includes a buffer valve, when the door of the dishwasher is quickly closed and the instantaneous air pressure increases, the instantaneously increased air pressure acts on the surface of the rubber diaphragm in the buffer valve, causing the rubber diaphragm to deform towards the air outlet part in the buffer valve and resist and close the air outlet part, so that the instantaneously steeply increased air pressure cannot enter the pressure switch device through the air outlet part, thereby achieving the effect of avoiding affecting the pressure switch device's judgment of the actual water level and improving the stability of the pressure switch device.

[0006] A dishwasher of the present invention includes a dishwasher body and a water level detection device installed inside the dishwasher body. The dishwasher body includes a water cup housing, and a water storage cavity and an air cavity communicating with the lower part of the water storage cavity are surrounded by the water cup housing. The water level detection device includes a pressure switch device, a buffer valve arranged between the pressure switch device and the air cavity, and an air pipe connecting the air cavity, the buffer valve, and the pressure switch device in series. The buffer valve includes a valve housing and a rubber diaphragm installed in the inner cavity of the valve housing in the gas passing direction. There is a first gap between the edge of the rubber diaphragm and the annular inner wall of the valve housing to allow air to pass slowly, and there is a second gap between one side of the rubber diaphragm and the air outlet of the valve housing to close the air outlet when the air pressure increases abnormally and steeply and the rubber diaphragm is deformed under pressure.

[0007] Another form of the dishwasher of the present invention may be:

[0008] Both the first gap and the second gap are 0.1 - 0.5 mm.

[0009] The air outlet is a tubular structure, and the inner end of the air outlet extends into the inner cavity of the valve housing and is disposed opposite to the center of the rubber diaphragm.

[0010] The valve housing includes a semi - enclosed main housing and a cover detachably connected to the semi - enclosed main housing. The air outlet is opened on one side wall of the semi - enclosed main housing, and the air inlet of the valve housing is opened on the cover.

[0011] It further includes at least two first limit posts fixedly connected to the annular inner wall of the valve housing for installing the rubber diaphragm.

[0012] A step surface is provided in the thickness direction at one end of the first limit post, and the edge of one side of the rubber diaphragm is fixedly connected to the step surface.

[0013] There are nine first limit posts, and the nine first limit posts are arranged at intervals in a ring.

[0014] The air inlet and the air outlet are arranged axially in the same direction.

[0015] It further includes at least two second limit posts. One end of the second limit post is fixedly connected to the inner wall of the cover, and the other end of the second limit post abuts against the other side of the rubber diaphragm. The second limit post and the first limit post jointly limit the rubber diaphragm.

[0016] There are four second limit posts, and the four second limit posts are arranged at intervals in a ring.

[0017] A dishwasher of the present invention has the following advantages over the prior art: it includes a dishwasher body and a water level detection device installed in the dishwasher body, wherein the dishwasher body includes a water cup shell, the water cup shell is surrounded by a water storage cavity and an air cavity connected to the lower part of the water storage cavity, the water level detection device includes a pressure switch device, a buffer valve arranged between the pressure switch device and the air cavity, and an air pipe connecting the air cavity, the buffer valve and the pressure switch device in series, the buffer valve includes a valve shell and a rubber diaphragm installed in the air passing direction of the inner cavity of the valve shell, a first gap is provided between the edge of the rubber diaphragm and the annular inner wall of the valve shell to allow air to pass slowly, and a second gap is provided between one side of the rubber diaphragm and the air outlet of the valve shell. In this way, when the dishwasher door is closed rapidly, the connection port on the inner tank of the dishwasher with the atmosphere cannot quickly balance the air pressure, and the air pressure in the inner cavity increases instantly. The air pressure is transmitted to the water, and then transported to the inner cavity of the buffer valve through the air pipe. Since the air pressure increases instantly, the air pressure acts on the surface of the rubber diaphragm to deform the rubber diaphragm toward the air outlet and seal the air outlet, so that the instantly increased air pressure cannot enter the pressure switch device through the air outlet, thereby avoiding affecting the pressure switch device's judgment of the actual water level and improving the stability of the pressure switch device. When the air pressure in the inner tank is slowly balanced, the rubber diaphragm elastically resets to release the seal on the air outlet, so that the pressure switch device can normally detect the air pressure and correctly judge the water level. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The present invention is a connection diagram of a water level detection device for a dishwasher.

[0019] Figure 2 The present invention is a schematic cross-sectional view of a buffer valve of a water level detection device of a dishwasher.

[0020] Figure 3 Another schematic cross-sectional view of a buffer valve of a water level detection device for a dishwasher according to the present invention.

[0021] Figure 4 The present invention is a three-dimensional schematic diagram of a valve housing of a buffer valve of a water level detection device of a dishwasher.

[0022] Figure 5 It is a schematic diagram of the disassembly of the valve housing of the buffer valve of the water level detection device of the dishwasher of the present invention.

[0023] Description of Figure Number

[0024] 1. Dishwasher body; 11. Cup housing; 111. Water storage cavity; 112. Air cavity;

[0025] 2. Water level detection device; 21. Pressure switch device; 22. Buffer valve; 221. Valve housing; 2211. Air outlet; 2212. Main housing; 2213. Cover; 2214. Air inlet; 23. Air pipe

[0026] 3. First limit post; 31. Step surface

[0027] 4. Second limit post Specific embodiments

[0028] The following further describes in detail a dishwasher of the present invention with reference to the accompanying drawings Figures 1 to 5 A dishwasher of the present invention includes a dishwasher body 1 and a water level detection device 2

[0029] The dishwasher body 1 includes a water cup housing 11, and a water storage cavity 111 and an air cavity 112 communicating with the lower part of the water storage cavity 111 are surrounded by the water cup housing 11

[0030] The water level detection device 2 is installed in the dishwasher body 1. The water level detection device 2 includes a pressure switch device 21 electrically connected to the controller of the dishwasher body 1, a buffer valve 22 provided between the pressure switch device 21 and the air cavity 112, and an air pipe 23 that serially connects the air cavity 112, the buffer valve 22, and the pressure switch device 21

[0031] The pressure switch device 21 is a microelectromechanical pressure sensor connected to the controller of the dishwasher body 1, and is used to detect the air pressure in the air cavity 112 to judge the water level

[0032] The buffer valve 22 includes a valve housing 221 and a rubber diaphragm 222 installed in the inner cavity of the valve housing 221 in the gas passing direction

[0033] The outer shape of the valve housing 221 is cylindrical, and the valve housing 221 surrounds an inner cavity. Of course, the valve housing 221 is not limited to being cylindrical, and those skilled in the art can select the valve housing 221 of other shapes according to actual needs

[0034] There is a first gap between the edge of the rubber diaphragm 222 and the annular inner wall of the valve housing 221 to allow air to pass through slowly. There is a second gap between one side surface of the rubber diaphragm 222 and the air outlet 2211 of the valve housing 221, so that when the air pressure increases abnormally steeply, the rubber diaphragm 222 is deformed by pressure to close the air outlet 2211

[0035]

[0036] ​Working principle: When the dishwasher is normally inletted with water (for example, the water inlet speed generally does not exceed 4L / min), the air in the air cavity 112 connected to the water storage cavity 111 is compressed due to the rising water level and causes the air to slowly flow into the inner cavity of the buffer valve 22 through the air pipe 23. Due to the pressure difference, the air will slowly flow into the pressure switch device 21 through the first gap between the edge of the rubber diaphragm 222 and the annular inner wall of the valve housing 221. The pressure detected by the pressure switch device 21 is consistent with the actual water level.

[0037] When the door of the dishwasher is closed rapidly, the connection port on the inner tank of the dishwasher with the atmosphere cannot quickly balance the air pressure, and the air pressure in the inner cavity increases instantly. The air pressure is transmitted to the water, and then is transported to the inner cavity of the buffer valve 22 through the air pipe 23. Since the air pressure increases instantly, the air pressure acts on the surface of the rubber diaphragm 222 to deform the rubber diaphragm 222 toward the air outlet portion 2211, resisting and closing the air outlet portion 2211, so that the sharply increased air pressure cannot enter the pressure switch device 21 through the air outlet portion 2211, thereby avoiding affecting the pressure switch device 21 from judging the actual water level and improving the stability of the pressure switch device 21.

[0038] When the air pressure in the inner tank is gradually balanced, the rubber diaphragm 222 elastically returns to its original position to release the seal on the air outlet 2211, so that the pressure switch device 21 can normally detect the air pressure and correctly determine the water level.

[0039] The water level detection device 2 for a dishwasher of the present invention is not limited to use in water level detection of dishwashers, but can also be widely used in other equipment that uses gas or liquid as the pressure medium of a pressure detection switch device to detect water level. Those skilled in the art can install the water level detection device 2 for a dishwasher of the present invention on the required equipment according to actual needs.

[0040] A dishwasher of the present invention, please refer to Figures 1 to 5 In the relevant figures, based on the previous technical solution, the first gap and the second gap are both 0.1-0.5 mm. When the first gap and the second gap are both 0.3 mm, the stability of the pressure switch device 21 is optimal. Of course, the first gap and the second gap are not limited to 0.1-0.5 mm, and those skilled in the art can select the values of the first gap and the second gap according to actual needs.

[0041] A dishwasher of the present invention, please refer to Figures 1 to 5Regarding the related drawings, based on the foregoing technical solution, it may further be: the air outlet portion 2211 is a tubular structure, and the inner end of the air outlet portion 2211 extends into the inner cavity of the valve housing 221 and is disposed opposite to the center of the rubber diaphragm 222. When the rubber diaphragm 222 undergoes instantaneous deformation, the deformation amplitude of the central portion of the rubber diaphragm 222 is the largest, so that the air outlet portion 2211 can be instantaneously closed, thereby further improving the stability of the pressure switch device 21.

[0042] A dishwasher of the present invention, please refer to Figures 1 to 5 Regarding the related drawings, based on the foregoing technical solution, it may further be: the valve housing 221 includes a semi-closed main housing 2212 and a cover body 2213.

[0043] The cover body 2213 is detachably connected to the semi-closed main housing 2212. The air outlet portion 2211 is opened on one side wall of the semi-closed main housing 2212, and the air inlet portion 2214 of the valve housing 221 is opened on the cover body 2213. The inner cavity of the valve housing 221 is jointly formed by the semi-closed main housing 2212 and the cover body 2213, so as to facilitate the installation and disassembly of the rubber diaphragm 222.

[0044] A dishwasher of the present invention, please refer to Figures 1 to 5 Regarding the related drawings, based on the foregoing technical solution, it may further be: the air inlet portion 2214 and the air outlet portion 2211 are arranged axially in the same direction, so that the instantaneously introduced air pressure directly acts on the central portion of the rubber diaphragm 222, so that the central portion of the rubber diaphragm 222 instantaneously deforms to block the air outlet portion 2211, thereby further improving the stability of the pressure switch device 21.

[0045] A dishwasher of the present invention, please refer to Figures 1 to 5 Regarding the related drawings, based on the foregoing technical solution, it may further be: it further includes at least two first limiting columns 3, and the first limiting columns 3 are fixedly connected to the annular inner wall of the valve housing 221 for installing the rubber diaphragm 222. For example, the edge end of the rubber diaphragm 222 is bonded to the first limiting columns 3. Of course, the connection between the rubber diaphragm 222 and the first limiting columns 3 is not limited to bonding, and those skilled in the art can select the connection method between the rubber diaphragm 222 and the first limiting columns 3 according to actual needs.

[0046] A dishwasher of the present invention, please refer to Figures 1 to 5 Regarding the related drawings, based on the foregoing technical solution, it may further be: a step surface 31 is provided in the thickness direction at one end of the first limiting column 3, and the edge of one side surface of the rubber diaphragm 222 is fixedly connected to the step surface 31. For example, the edge of one side surface of the rubber diaphragm 222 is adhesively bonded to the step surface 31 through an adhesive.

[0047] A dishwasher of the present invention, please refer to Figures 1 to 5Regarding the related drawings, on the basis of the foregoing technical solutions, it may also be: There are nine first limit posts 3, and the nine first limit posts 3 are arranged at intervals in a ring, so as to achieve the effect of uniform force on the rubber diaphragm 222 during instantaneous deformation.

[0048] A dishwasher of the present invention, please refer to Figures 1 to 5 Regarding the related drawings, on the basis of the foregoing technical solutions, it may also be: It further includes at least two second limit posts 4. One end of the second limit post 4 is fixedly connected to the inner wall of the cover body 2213, and the other end of the second limit post 4 abuts against the other side surface of the rubber diaphragm 222. The second limit post 4 and the first limit post 3 jointly limit the rubber diaphragm 222, so that the whole rubber diaphragm 222 cannot move back and forth, avoiding interfering with the detection of the pressure switch device 21.

[0049] A dishwasher of the present invention, please refer to Figures 1 to 5 Regarding the related drawings, on the basis of the foregoing technical solutions, it may also be: There are four second limit posts 4, and the four second limit posts 4 are arranged at intervals in a ring, so as to achieve the effect of uniformly limiting the rubber diaphragm 222.

[0050] The above only illustrates several specific embodiments of the present invention, but it cannot be used as the protection scope of the present invention. Any equivalent changes, modifications, equal-proportion enlargements or reductions, etc. made in accordance with the design spirit of the present invention shall be considered to fall within the protection scope of the present invention.

Claims

1. A dishwasher, characterized in that, Comprising: A dishwasher body (1), including a water cup housing (11), the water cup housing (11) surrounding a water storage cavity (111) and an air cavity (112) communicating with the lower part of the water storage cavity (111). A water level detection device (2), installed inside the dishwasher body (1), the water level detection device (2) including a pressure switch device (21), a buffer valve (22) provided between the pressure switch device (21) and the air cavity (112), and an air pipe (23) connecting the air cavity (112), the buffer valve (22), and the pressure switch device (21) in series. The buffer valve (22) includes a valve housing (221) and a rubber diaphragm (222) installed in the inner cavity of the valve housing (221) in the gas passing direction. There is a first gap between the edge of the rubber diaphragm (222) and the annular inner wall of the valve housing (221) to allow air to pass slowly, and there is a second gap between one side surface of the rubber diaphragm (222) and the air outlet part (2211) of the valve housing (221) so that when the air pressure increases abnormally steeply, the rubber diaphragm (222) is deformed under pressure to close the air outlet part (2211). Both the first gap and the second gap are 0.1 - 0.5 mm. The air outlet part (2211) is a tubular structure, and the inner end of the air outlet part (2211) extends into the inner cavity of the valve housing (221) and is arranged opposite to the center of the rubber diaphragm (222). When the rubber diaphragm (222) undergoes instantaneous deformation, the central part of the rubber diaphragm (222) has the largest deformation amplitude, so as to be able to instantaneously close the air outlet part (2211).

2. The dishwasher according to claim 1, wherein, The valve housing (221) includes a semi - enclosed main housing (2212) and a cover body (2213) detachably connected to the semi - enclosed main housing (2212). The air outlet part (2211) is opened on one side wall of the semi - enclosed main housing (2212), and the air inlet part (2214) of the valve housing (221) is opened on the cover body (2213).

3. A dishwasher according to claim 2, wherein The air inlet part (2214) and the air outlet part (2211) are arranged axially in the same direction.

4. A dishwasher according to claim 3, wherein, It further includes at least two first limit posts (3), the first limit posts (3) being fixedly connected to the annular inner wall of the valve housing (221) for installing the rubber diaphragm (222).

5. A dishwasher according to claim 4, characterized in that, On the thickness direction of one end of the first limit post (3), there is a stepped surface (31), and the edge of one side surface of the rubber diaphragm (222) is fixedly connected to the stepped surface (31).

6. A dishwasher according to claim 5, wherein, The first limit posts (3) are nine, and the nine first limit posts (3) are arranged at intervals in a ring.

7. A dishwasher according to claim 6, characterized in that, It further includes at least two second limit posts (4), one end of the second limit posts (4) being fixedly connected to the inner wall of the cover body (2213), and the other end of the second limit posts (4) abutting against the other side surface of the rubber diaphragm (222). The second limit posts (4) and the first limit posts (3) jointly limit the rubber diaphragm (222).

8. A dishwasher according to claim 7, wherein, The second limiting posts (4) are four in number, and the four second limiting posts (4) are arranged at intervals in a ring.

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