Water level detection system and its dishwasher

Abstract

The present invention discloses a water level detection system and a dishwasher thereof. The water level detection system includes: a water cup assembly having a water collection chamber and an air chamber, the air chamber communicating with the water collection chamber; a pressure switch assembly; a buffer assembly including a valve body and a valve core module. The valve body is provided with an air inlet and an air outlet that are connected and communicated. The air inlet communicates with the air chamber, and the air outlet communicates with the pressure switch assembly. The valve core module is disposed on the valve body and is used to cut off the passage between the air inlet and the air outlet when the air pressure in the air chamber suddenly increases, and is also used to open the passage between the air inlet and the air outlet after the air pressure in the air chamber resumes balance. The water level detection system proposed by the present invention can effectively solve the problem that the pressure switch assembly is mis-triggered due to sudden changes in air pressure, thereby affecting the washing effect.

Description

Technical Field

[0001] The present invention relates to the technical field of dishwashers, and in particular to a water level detection system and a dishwasher thereof. Background Art

[0002] 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 filtration system. An intake port is opened at a position slightly below the middle of the side wall of the water cup, and the intake port is connected to a circulation water pump. The circulation water pump conveys 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. However, too much or too little water volume will have adverse effects. 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 method uses a pressure switch. 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 trapped 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, during the washing process, it may be necessary to open the door. After that, if the door is quickly closed, an instantaneously increased air pressure will be formed in the washing cavity, and it will be conducted to the air chamber through water, and finally the pressure switch may be accidentally triggered. At this time, after starting drainage, the water volume inside the dishwasher will be too small, which will further affect the washing effect. Summary of the Invention

[0005] The present invention aims to solve at least one of the problems existing in the related prior art to some extent. For this purpose, the present invention provides a water level detection system, which can effectively solve the problem that the sudden change of air pressure causes the pressure switch assembly to be accidentally triggered, thereby affecting the washing effect.

[0006] The present invention also provides a dishwasher having the water level detection system.

[0007] According to the water level detection system provided above, it is realized through the following technical solutions:

[0008] Water level detection system, comprising: a water cup assembly having a water collecting chamber and an air chamber, the air chamber communicating with the water collecting chamber; a pressure switch assembly; a buffer assembly including a valve body and a valve core module, the valve body being provided with an air inlet and an air outlet which are communicated with each other, the air inlet communicating with the air chamber, the air outlet communicating with the pressure switch assembly, the valve core module being disposed on the valve body and configured to cut off the passage between the air inlet and the air outlet when the air pressure in the air chamber suddenly increases, and further configured to open the passage between the air inlet and the air outlet after the air pressure in the air chamber resumes balance.

[0009] In some embodiments, the valve body is further provided with an air passage, the air inlet is communicated with the air outlet through the air passage; the valve core module is movably disposed in the air passage, the valve core module is pushed to move towards the air outlet direction when the air pressure in the air chamber suddenly increases and can close the air passage, or the valve core module moves towards the air inlet direction during the process of the air pressure in the air chamber resuming balance and can open the air passage after the air pressure in the air chamber resumes balance.

[0010] In some embodiments, the air passage includes an air inlet section, a tapered section and an air outlet section which are sequentially communicated, the cross-sectional area of the air inlet section is larger than that of the air outlet section, and the cross-sectional area of the tapered section gradually decreases from the air inlet section to the air outlet section; the valve core module includes an adjusting member and an elastic member, the adjusting member is movably disposed in the air inlet section and can move between the air inlet section and the tapered section, the cross-sectional area of the adjusting member is smaller than that of the air inlet section and larger than that of the air outlet section or the minimum cross-sectional area of the tapered section, one end of the elastic member is disposed in the air outlet section, and the other end is connected to, abuts against or is close to the adjusting member for resetting the adjusting member towards the air inlet.

[0011] In some embodiments, a guiding portion is provided at one end of the adjusting member close to the air outlet section, and the guiding portion is adapted to the wall surface of the tapered section.

[0012] In some embodiments, a groove is provided on the wall surface of the air inlet section and recesses outwardly and communicates with the air inlet section, the groove is arranged along the length direction of the air inlet section, and when the adjusting member opens the air passage, the adjusting member is located between the opposite ends of the groove.

[0013] In some embodiments, the air duct is frustum-shaped with a larger cross-section at one end near the air inlet and a smaller cross-section at the other end; the valve core module includes an adjusting member and an elastic member. The adjusting member is movably disposed in the air duct, and the cross-sectional area of the adjusting member is larger than the minimum cross-sectional area of the smaller end of the air duct and smaller than the minimum cross-sectional area of the larger end of the air duct. The elastic member is disposed in the air duct and located between the air outlet and the adjusting member, and is configured to push the adjusting member towards the air inlet for a reset movement to open the air duct.

[0014] In some embodiments, a guiding portion is provided at one end of the adjusting member near the air outlet, and the guiding portion is adapted to the wall surface of the smaller end of the air duct.

[0015] In some embodiments, the adjusting member is made of rubber; alternatively, the valve core module further includes a sealing member, and the sealing member is sleeved on the outer surface of one end of the adjusting member near the elastic member.

[0016] In some embodiments, the valve body is further provided with a first opening, a second opening, and an installation port. The installation port communicates with the air inlet through the first opening, and the installation port communicates with the air outlet through the second opening; the valve core module includes a throttling solenoid valve, and the throttling solenoid valve is disposed at the installation port and covers the opening of the installation port, and is configured to open or close the first opening or the second opening.

[0017] According to the dishwasher provided above, it is realized by the following technical solutions:

[0018] A dishwasher, a door body assembly, and an inner container assembly, further including the water level detection system as described above, and the water collecting chamber communicates with the inner container assembly.

[0019] Compared with the prior art, the present invention has at least the following beneficial effects:

[0020] In the water level detection system of the present invention, a buffer assembly is added between the air chamber of the water cup assembly and the pressure switch assembly. The buffer assembly includes a valve body and a valve core module disposed on the valve body. The valve core module is configured to cut off the passage between the air chamber and the pressure switch assembly when the air pressure in the air chamber suddenly increases, so as to ensure that the suddenly increased air pressure will not be transmitted to the pressure switch assembly, thereby avoiding mis-triggering of the pressure switch assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of the dishwasher in Embodiment 1 of the present invention;

[0022] Figure 2 is a cross-sectional view of the buffer assembly in Embodiment 1 of the present invention, in which the air duct is in an open state;

[0023] Figure 3It is a schematic structural view of the lower valve body in Embodiment 1 of the present invention;

[0024] Figure 4 It is a cross-sectional view of the buffer assembly in Embodiment 1 of the present invention, and the air passage is in a closed state in the figure;

[0025] Figure 5 It is a cross-sectional view of the buffer assembly in Embodiment 2 of the present invention, and the air passage is in an open state in the figure;

[0026] Figure 6 It is a cross-sectional view of the buffer assembly in Embodiment 2 of the present invention, and the air passage is in a closed state in the figure;

[0027] Figure 7 It is a cross-sectional view of the buffer assembly in Embodiment 3 of the present invention, and the air inlet is communicated with the air outlet in the figure;

[0028] Figure 8 It is a cross-sectional view of the buffer assembly in Embodiment 3 of the present invention, and the air inlet is not communicated with the air outlet in the figure.

[0029] Reference numerals: water cup assembly 1, water collecting cavity 11, air chamber 12;

[0030] Pressure switch assembly 2;

[0031] Valve body 31, valve cover 3101, valve housing 3102, air inlet 311, air outlet 312, air passage 313, conical section 3131, groove 3132, limiting step 3133, first opening 314, second opening 315, mounting opening 316, adjusting member 32, guiding portion 321, elastic member 33, shut-off solenoid valve 34, first air pipe 351, second air pipe 352;

[0032] Door body assembly 4;

[0033] Inner tank assembly 5. Detailed implementation manners

[0034] The following embodiments illustrate the present invention, but the present invention is not limited by these embodiments. Modifying the specific implementation manners of the present invention or making equivalent replacements for some technical features without departing from the spirit of the present invention scheme shall all be covered within the scope of the technical solution claimed by the present invention.

[0035] Embodiment 1

[0036] Reference Figure 1-2, this embodiment provides a water level detection system, which is applied to a dishwasher to solve the problem that the pressure switch component is mis-triggered due to sudden changes in air pressure, thereby affecting the washing effect. In this embodiment, the water level detection system includes a water cup assembly 1, a pressure switch assembly 2, and a buffer assembly (not shown in the figure). The water cup assembly 1 has a water collection chamber 11 and an air chamber 12. The water collection chamber 11 communicates with the inner tank assembly 5 of the dishwasher, and the air chamber 12 communicates with the water collection chamber 11. The buffer assembly includes a valve body 31 and a valve core module (not shown in the figure). The valve body 31 is provided with a communicating air inlet 311 and an air outlet 312. The air inlet 311 communicates with the air chamber 12 through a first air pipe 351, and the air outlet 312 communicates with the pressure switch assembly 2 through a second air pipe 352. The valve core module is arranged on the valve body 31 and is used to cut off the passage between the air inlet 311 and the air outlet 312 when the air pressure in the air chamber 12 suddenly increases, so as to avoid the sudden increase in air pressure being transmitted to the pressure switch assembly 2 and causing the pressure switch assembly 2 to be mis-triggered. The valve core module is also used to open the passage between the air inlet 311 and the air outlet 312 after the air pressure in the air chamber 12 returns to balance, so that the air outlet end of the air inlet 311 communicates with the pressure switch assembly 2, ensuring that the pressure switch assembly 2 can detect the pressure in the air chamber 11 in real time.

[0037] After the water collection chamber 11 of the water cup assembly 1 is filled with water, a certain amount of air is sealed in the air chamber 12. When the water level rises, the air pressure increases steadily. Since the air inlet 311 and the air outlet 312 are in a communicating state, the air pressure reaches the pressure switch assembly 2 through the buffer assembly. The pressure switch assembly 2 can detect the pressure in the air chamber 12 and determine whether to start the high water level protection measure according to the detected pressure.

[0038] Reference Figure 4 , and when there is a rapid door closing or similar situation, when the internal instantaneous air pressure in the inner tank assembly 5 of the dishwasher increases, that is, a sudden increase in air pressure occurs. Before or when the sudden increase in air pressure is transmitted to the buffer assembly, the valve core module cuts off the passage between the air inlet 311 and the air outlet 312, so that the sudden increase in air pressure cannot be transmitted to the pressure switch assembly 2, thereby ensuring that the pressure switch assembly 2 does not receive the sudden increase in air pressure, effectively avoiding the problem that the pressure switch assembly 2 is mis-triggered due to the sudden increase in air pressure and affecting the washing effect.

[0039] It can be seen that the water level detection system of this embodiment adds a buffer assembly between the air chamber 12 of the water cup assembly 1 and the pressure switch assembly 2. The buffer assembly includes a valve body 31 and a valve core module arranged on the valve body 31. The valve core module is used to cut off the passage between the air chamber 12 and the pressure switch assembly 2 when the air pressure in the air chamber 12 suddenly increases, so as to ensure that the sudden increase in air pressure will not be transmitted to the pressure switch assembly 2, thereby avoiding the mis-triggering of the pressure switch assembly 2.

[0040] Reference Figure 2-3, in this embodiment, the valve body 31 is further provided with an air passage 313, and the air inlet 311 is connected to the air outlet 312 through the air passage 313. The valve core module is movably disposed in the air passage 313, that is, the valve core module can reciprocate along the air passage 313. When the air pressure in the air chamber 12 suddenly increases, under the push of the suddenly increased air pressure, the valve core module is pushed to move towards the air outlet 312, and can close the air passage 313 to reliably cut off the passage between the air inlet 311 and the air outlet 312, ensuring that the air pressure in the air chamber 12 cannot be transmitted to the pressure switch assembly 2; during the process of the air pressure in the air chamber 12 returning to balance, the valve core module moves in the direction of the air inlet 311 for reset, and can open the air passage 313 after the air pressure in the air chamber 12 returns to balance, so as to reliably open the passage between the air inlet 311 and the air outlet 312, ensuring that the pressure switch assembly 2 can detect the pressure in the air chamber 12.

[0041] Optionally, the valve body 31 includes a valve cover 3101 and a valve housing 3102. The valve cover 3101 is provided with an air inlet 311, and the valve housing 3102 has an air outlet 312 and a valve chamber opening towards the valve cover 3101. During installation, the valve cover 3101 is connected to the valve housing 3102 and covers the opening of the valve chamber. The air passage 313 is jointly defined by the valve chamber and the valve cover 3101. In this way, by designing the valve body 31 to be composed of the valve cover 3101 and the valve housing 3102, it is more convenient to assemble the valve core module inside the air passage 313.

[0042] Optionally, the valve cover 3101 and the valve housing 3102 can be fixedly connected by welding, riveting, etc., or can also be connected by threads or other detachable connection methods. To avoid air leakage at the connection between the valve cover 3101 and the valve housing 3102, a sealing structure can be added at the mating part of the valve cover 3101 and the valve housing 3102.

[0043] Optionally, the air passage 313 includes an intake section (not shown in the figure), a tapered section 3131, and an outlet section (not shown in the figure) that are connected in sequence. The intake section is arranged close to the intake opening 311, the outlet section is arranged close to the air outlet 312, and the tapered section 3131 is located between the intake section and the outlet section. The cross-sectional area of the intake section is larger than that of the outlet section, and the cross-sectional area of the tapered section 3131 gradually decreases from the intake section to the outlet section.

[0044] In this embodiment, the intake section and the outlet section are preferably cylindrical, the tapered section 3131 is conical, the diameter of the intake section is equal to the maximum diameter of the tapered section 3131, and the diameter of the outlet section is smaller than the minimum diameter of the tapered section 3131. In this way, a limiting step 3133 can be formed at the connection between the outlet section and the tapered section 313, and this limiting step 3133 can play a role in limiting the movement of the valve core module.

[0045] Reference Figure 2, in this embodiment, the spool module includes an adjusting member 32. The adjusting member 3 is preferably a cylindrical plug, which is movably arranged in the intake section and can move between the intake section and the conical section 3131 to open or close the air passage 313. The cross-sectional area of the adjusting member 32 is smaller than that of the intake section. In this way, it is not only convenient for the adjusting member 32 to move, but also ensures that when the adjusting member 32 is pushed and reset to be completely located in the intake section, there is a gap for air flow between the wall surface of the intake section and the adjusting member 32, realizing reliable opening of the air passage 313.

[0046] The cross-sectional area of the adjusting member 32 is larger than the cross-sectional area of the outlet section or the minimum cross-sectional area of the conical section 3131. In this way, it is ensured that when the adjusting member 32 is pushed into the conical section 3131 and abuts against the wall surface of the conical section 3131 or abuts against the limiting step 3133, the air passage 313 can be reliably closed.

[0047] When the cross-sectional area of the adjusting member 32 is larger than the minimum cross-sectional area of the conical section 3131, when the adjusting member 32 is pushed and moved to the conical section 3131, it can reliably abut against the wall surface of the conical section 3131, and the adjusting member 32 closes or blocks the conical section 3131, thereby realizing the closing of the air passage 313, that is, cutting off the passage between the air inlet 311 and the air outlet 312.

[0048] When the cross-sectional area of the adjusting member 32 is smaller than the minimum cross-sectional area of the conical section 3131 and larger than the cross-sectional area of the outlet section, when the adjusting member 32 is pushed and moved into the conical section 3131 and abuts against the limiting step 3133, the adjusting member 32 closes or blocks the inlet of the outlet section, thereby realizing the closing of the air passage 313.

[0049] In this embodiment, the spool module further includes an elastic member 33. The elastic member 33 is preferably a spring, one end of which is arranged in the outlet section, and the other end is connected to, abuts against or is close to the adjusting member 32. That is, the elastic member 33 and the adjusting member 32 can be designed to be connected or abutted, or designed to be arranged close to each other, so as to ensure that when the adjusting member 32 moves towards the air outlet 312 direction under the push of a suddenly increased air pressure, the elastic member 33 can be reliably compressed, so as to ensure that during the process of the air pressure in the air chamber 12 returning to balance, the restoring force of the elastic member 33 can push the adjusting member 32 to move in the reset direction, so as to ensure that the adjusting member 32 opens the air passage 313.

[0050] Optionally, a guiding portion 321 is provided at one end of the adjusting member 32 close to the outlet section. The guiding portion 321 is adapted to the wall surface of the conical section 3131, that is, the inclination direction and inclination degree of the guiding portion 321 and the wall surface of the conical section 3131 are the same. Thus, by providing the guiding portion 321 and the conical section 3131, a guiding effect is exerted on the movement of the adjusting member 32.

[0051] In other embodiments, the adjusting member 32 can be made of rubber, which is beneficial to improving the airtightness when the adjusting member 32 closes the air passage 313. Alternatively, the valve core module can further include a seal, which is sleeved on the outer surface of one end of the adjusting member 32 close to the elastic member 33, that is, on the outer surface of the guiding portion 321. In this way, the setting of the seal not only plays a buffering role and reduces the wear of the adjusting member 32, but also helps to improve the airtightness when the adjusting member 32 closes the air passage 313.

[0052] Reference Figure 2-4 , optionally, a groove 3132 that is recessed outward and communicates with the intake section is provided on the wall surface of the intake section. The groove 3132 is arranged along the length direction of the intake section. When the adjusting member 32 opens the air passage 313, the adjusting member 32 is located between the opposite ends of the groove 3132. Thus, through the setting of the groove 3132, it is ensured that when the adjusting member 32 is in the position of opening the air passage 313, the unit ventilation area is larger, which is more convenient for transmitting the air pressure to the pressure switch assembly 2 and improving the accuracy and reliability of the pressure switch assembly 2 for detecting the pressure in the air chamber 12.

[0053] In this embodiment, the number of the grooves 3132 is multiple, and the multiple grooves 3132 are evenly spaced along the circumferential direction to further increase the unit ventilation area.

[0054] Reference Figure 1 , this embodiment also provides a dishwasher, which includes a door body assembly 4 and an inner container assembly 5 with an open side. The door body assembly 4 is arranged on the inner container assembly 5 for opening or closing the open mouth of the inner container assembly 5. The dishwasher also includes the water level detection system as described above, and the water collection chamber 11 communicates with the inside of the inner container assembly 5. Thus, by adding a water level detection system to the dishwasher, on the one hand, high water level detection is realized, and high water level protection measures are taken in time when a high water level occurs. On the other hand, when rapid door closing and similar things occur, the passage between the air inlet 311 and the air outlet 312 can be automatically cut off, so that the suddenly rising air pressure cannot be transmitted to the pressure switch assembly 2, thereby ensuring that the pressure switch assembly 2 does not receive the suddenly rising air pressure, effectively avoiding the problem that the sudden rise of air pressure causes the pressure switch assembly 2 to be mis-triggered and affecting the washing effect.

[0055] Embodiment 2

[0056] Reference Figure 5-6, The difference between this embodiment and Embodiment 1 lies in the different shape of the air passage 313. In this example, the air passage 313 is in the shape of a frustum of a cone with a larger end near the air inlet 311 and a smaller end at the other end. The valve core module includes an adjusting member 32 and an elastic member 33. The adjusting member 32 is movably arranged in the air passage 313. The cross-sectional area of the adjusting member 32 is larger than the minimum cross-sectional area of the smaller end of the air passage 313 and smaller than the minimum cross-sectional area of the larger end of the air passage 313. The elastic member 33 is arranged in the air passage 313 and located between the air outlet 312 and the adjusting member 32, and is used to push the adjusting member 32 to move in the reset direction towards the air inlet 311 to open the air passage 313.

[0057] Optionally, a guiding portion 321 is provided at one end of the adjusting member 32 close to the air outlet 312. The guiding portion 321 is adapted to the wall surface of the smaller end of the air passage 313, that is, the inclination direction and inclination degree of the guiding portion 321 are the same as those of the wall surface of the air passage 313.

[0058] It can be seen that the overall structure of the air passage 313 of the valve body 31 in this embodiment is simpler, which is more convenient for rapid processing and forming, and makes the manufacturing cost lower.

[0059] Embodiment 3

[0060] Reference Figure 7-8 , The difference between this embodiment and Embodiment 1 lies in the different structure of the buffer assembly. In this example, the valve body 31 is further provided with a first opening 314, a second opening 315 and an installation port 316. The installation port 316 is communicated with the air inlet 311 through the first opening 314, and the installation port 316 is communicated with the air outlet 312 through the second opening 315. The valve core module includes a throttling solenoid valve 34. The throttling solenoid valve 34 is arranged at the installation port 316 and covers the opening of the installation port 316 to prevent air leakage at the joint between the throttling solenoid valve 34 and the installation port 316. The throttling solenoid valve 34 is electrically connected to the controller of the dishwasher and is used to open or close the first opening 314 or the second opening 315.

[0061] In this embodiment, the throttling solenoid valve 34 is preferably a normally open pilot-operated solenoid valve to facilitate reducing power consumption. Taking the throttling solenoid valve 34 used to open or close the second opening 315 as an example in this embodiment, the dishwasher further includes a timer electrically connected to the controller. The timer is at least used to record the closing duration of the throttling solenoid valve 34 or the door body assembly 4.

[0062] Reference Figure 8 , Once the controller of the dishwasher detects that the door body assembly 4 is closed, the controller of the dishwasher controls the throttling solenoid valve 34 to close the second opening 315. At this time, since the second opening 315 is blocked by the throttling solenoid valve 34, the air inlet 311 cannot be communicated with the air outlet 312. After the suddenly increased air pressure is transmitted to the air inlet 311, it can only be transmitted in the reverse direction towards the air chamber 12 until the air pressure in the air chamber 12 is slowly balanced.

[0063] Reference Figure 7 When the closing duration of the intercepting solenoid valve 34 or the door body assembly 4 reaches the set time threshold, and the set time threshold is greater than the total duration required for the air pressure to suddenly increase and then return to balance. The controller of the dishwasher controls the intercepting solenoid valve 34 to open the second opening 315, so that the air pressure can be transmitted from the air inlet 311, the first opening 314, the partial space of the mounting port 316 located below the intercepting solenoid valve 34, the second opening 315 and the air outlet 312 to the pressure switch assembly 2.

[0064] It can be seen that this embodiment realizes the linkage between the closing of the intercepting solenoid valve 34 and the door body assembly 4, ensuring that the suddenly increased air pressure generated by the rapid closing of the door body assembly 4 cannot be transmitted to the pressure switch assembly 2, thereby effectively solving the problem that the pressure switch assembly 2 is mis-triggered due to sudden changes in air pressure, which affects the washing effect.

[0065] The above are only some embodiments of the present invention. For those of ordinary skill in the art, without departing from the inventive concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A water level detection system, characterized in that, Comprising: A water cup assembly (1) having a water collecting cavity (11) and an air chamber (12), the air chamber (12) communicating with the water collecting cavity (11); A pressure switch assembly (2); A buffer assembly including a valve body (31) and a valve core module, the valve body (31) being provided with an air inlet (311) and an air outlet (312) that are connected and communicate with each other, the air inlet (311) communicating with the air chamber (12), and the air outlet (312) communicating with the pressure switch assembly (2), The valve body (31) is further provided with an air passage (313), the air inlet (311) being connected to the air outlet (312) through the air passage (313); the valve core module is movably disposed within the air passage (313), and when the air pressure in the air chamber (12) suddenly increases, the valve core module is pushed to move towards the air outlet (312) direction and can close the air passage (313), or when the air pressure in the air chamber (12) returns to balance, the valve core module moves towards the air inlet (311) direction and can open the air passage (313) after the air pressure in the air chamber (12) returns to balance; Wherein, the valve body (31) includes a valve cover and a valve housing, the air passage (313) includes an air inlet section, a tapered section (3131), and an air outlet section that are sequentially connected, and the cross-sectional area of the tapered section (3131) gradually decreases from the air inlet section to the air outlet section; The valve core module includes an adjusting member (32) and an elastic member (33), the adjusting member (32) is movably disposed within the air inlet section and can move between the air inlet section and the tapered section (3131), the cross-sectional area of the adjusting member (32) is smaller than the cross-sectional area of the air inlet section and larger than the cross-sectional area of the air outlet section or the minimum cross-sectional area of the tapered section (3131), one end of the elastic member (33) is disposed within the air outlet section, and the other end is connected to, abuts against, or is close to the adjusting member (32) for resetting the adjusting member (32) towards the air inlet (311).

2. The water level detection system according to claim 1, characterized in that, The cross-sectional area of the air inlet section is larger than the cross-sectional area of the air outlet section, and a limiting step (3133) can be formed at the connection between the air outlet section and the tapered section (3131), and the limiting step (3133) can play a role in limiting the movement of the valve core module.

3. The water level detection system according to claim 1, characterized in that, One end of the adjusting member (32) close to the air outlet section is provided with a guiding portion (321), and the guiding portion (321) is adapted to the wall surface of the tapered section (3131).

4. The water level detection system according to claim 1, characterized in that, A groove (3132) that is recessed outward and communicates with the air inlet section is provided on the wall surface of the air inlet section, the groove (3132) is arranged along the length direction of the air inlet section, and when the adjusting member (32) opens the air passage (313), the adjusting member (32) is located between the opposite ends of the groove (3132).

5. A water level detection system, characterized in that, Comprising: A water cup assembly (1) having a water collecting cavity (11) and an air chamber (12), the air chamber (12) communicating with the water collecting cavity (11); A pressure switch assembly (2); A buffer assembly, which includes a valve body (31) and a valve core module. The valve body (31) is provided with an air inlet (311) and an air outlet (312) that are connected and communicate with each other. The air inlet (311) communicates with the air chamber (12), and the air outlet (312) communicates with the pressure switch assembly (2). The valve body (31) is further provided with an air passage (313), and the air inlet (311) is connected to the air outlet (312) through the air passage (313); The valve core module is movably arranged in the air passage (313). When the air pressure in the air chamber (12) suddenly increases, the valve core module is pushed to move towards the air outlet (312) direction and can close the air passage (313). Or when the air pressure in the air chamber (12) returns to balance, the valve core module moves towards the air inlet (311) direction and can open the air passage (313) after the air pressure in the air chamber (12) returns to balance; Wherein, the valve body (31) includes a valve cover and a valve housing, and the air passage (313) is in the shape of a frustum of a cone with a larger end near the air inlet (311) and a smaller end; The valve core module includes an adjusting member (32) and an elastic member (33). The adjusting member (32) is movably arranged in the air passage (313). The cross-sectional area of the adjusting member (32) is larger than the minimum cross-sectional area of the smaller end of the air passage (313) and smaller than the minimum cross-sectional area of the larger end of the air passage (313). The elastic member (33) is arranged in the air passage (313) and is located between the air outlet (312) and the adjusting member (32), and is used to push the adjusting member (32) to move towards the air inlet (311) for resetting to open the air passage (313).

6. The water level detection system according to claim 5, characterized in that, One end of the adjusting member (32) close to the air outlet (312) is provided with a guiding portion (321), and the guiding portion (321) is adapted to the wall surface of the smaller end of the air passage (313).

7. The water level detection system according to any one of claims 1 - 6, characterized in that, The adjusting member (32) is made of rubber; Or, the valve core module further includes a sealing member, and the sealing member is sleeved on the outer surface of one end of the adjusting member (32) close to the elastic member (33).

8. The water level detection system according to any one of claims 1 - 6, characterized in that, The valve body (31) is further provided with a first opening (314), a second opening (315) and a mounting port (316). The mounting port (316) communicates with the air inlet (311) through the first opening (314), and the mounting port (316) communicates with the air outlet (312) through the second opening (315); The valve core module includes a throttling solenoid valve (34), and the throttling solenoid valve (34) is arranged at the mounting port (316) and covers the opening of the mounting port (316) for switching the first opening (314) or the second opening (315).

9. A dishwasher, a door body assembly (4) and an inner container assembly (5), characterized in that, It further includes a water level detection system according to any one of claims 1-8, and the water collecting chamber (11) communicates with the inner tank assembly (5).

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