Water stop valve for drainage pipe of automobile air conditioner

Abstract

The automobile air conditioner drainage pipe water stop valve comprises a valve body shell, a valve element sliding block, two limiting plates and a four-way guide pillar, the valve body shell is of a tubular structure, the two axial ends of the valve body shell are the water inlet end and the drainage end respectively, four clamping grooves are formed in the side wall of the side close to the water inlet end, and a round drainage hole is formed in the center of the end face of the drainage end; the drainage pipe is used for normal drainage; the valve element sliding block is coaxially arranged in the valve body shell and can slide in the axial direction. The two limiting plates are fixed in a crossed mode, the tail ends of the limiting plates are embedded in a clamping groove in the inner wall of the valve body shell, and the lower end face of the valve element sliding block is supported through the horizontal section and restrained within a preset stroke. Therefore, an electric control element is not needed, the state is automatically switched depending on gravity and buoyancy, the structure is simple, the service life is long, the buoyancy immediately drives the valve element sliding block to move upwards during wading, the annular sealing gasket is tightly attached to the valve seat, a backward flowing path is blocked, the tubular structure is matched with the standard connector, and it is guaranteed that radial shaking is avoided after installation through cooperation of the four-way guide column and the limiting plate.

Description

Technical Field

[0001] The present application relates to the technical field of automobile air-conditioning accessories, and in particular to a water stop valve for an automobile air-conditioning drain pipe. Background Art

[0002] In automotive air conditioning systems, water-stopping protection for drain pipes is a key technology for dealing with water-wading scenarios. Conventional water-stopping structures for automotive air conditioning drain pipes have the following significant flaws, which can easily cause water to flow back into the air conditioner during wading:

[0003] 1. Existing water stop valves cannot achieve automatic state switching

[0004] Traditional water check valves are often manually controlled or rely on external power (such as electronic control or spring drive) and are unable to automatically respond to water level changes. For example, a spring-loaded water check valve requires the water level to reach a certain height before closing due to spring force. However, when a car is wading through water, the water level rises rapidly, and the spring's delayed response can easily lead to backflow. Furthermore, manual control mechanisms cannot be operated in a timely manner while driving, posing a significant safety hazard.

[0005] 2. Complex structure leads to high reliability and maintenance costs

[0006] Some existing water-stop valves rely on multiple components (such as sensors, solenoid valves, and mechanical linkages) to achieve their water-stopping function. This not only increases manufacturing costs but also increases the failure rate due to its complex structure. For example, electronic control components are prone to short-circuiting and failure during wading, while mechanical components can become stuck due to wear and corrosion after long-term use, preventing them from opening and closing properly. Summary of the Invention

[0007] The present application aims to solve one of the technical problems in the related art at least to a certain extent.

[0008] To this end, one of the purposes of this application is to provide a car air-conditioning drain pipe water stop valve, which does not require electronic control components and relies on gravity and buoyancy to automatically switch states. It has a simple structure and a long service life. When wading through water, the buoyancy immediately drives the valve core slider upward, and the annular sealing gasket fits tightly with the valve seat to block the backflow path. The tubular structure is compatible with the standardized interface, and the cooperation of the four-way guide column and the limit plate ensures that there is no radial shaking after installation.

[0009] To achieve the above-mentioned purpose, the first embodiment of the present application proposes a water stop valve for an automobile air-conditioning drain pipe, comprising a valve body shell, a valve core slider, two limit plates, and a four-way guide column, wherein the valve body shell is a tubular structure, and the axial ends are respectively the water inlet end and the drainage end, and the side wall close to the water inlet end is provided with four slots, and a circular drain hole is provided in the center of the end face of the drainage end for drainage under normal conditions; the valve core slider is coaxially arranged inside the valve body shell and can slide axially; the two limit plates are cross-fixed, and the ends are embedded in the slots on the inner wall of the valve body shell, and the lower end face of the valve core slider is supported by the horizontal section to constrain it to a predetermined stroke. The valve body is installed in the valve body inner wall, so as to prevent the sliding beyond the limit; the four-way guide column is composed of four guide columns vertically protruding from the inner wall of the valve body shell and evenly distributed around the circumference, and its side wall fits with the valve core slider to form an axial sliding guide structure; the side wall of the valve core slider cooperates with the four-way guide column to form axial sliding; a drainage channel is formed between the four-way guide column and the inner wall of the valve body shell to ensure the smooth passage of water under normal conditions; under normal conditions, the valve core slider is abutted against the horizontal section of the limit plate by gravity, and the drainage end is open, and the air-conditioning condensate is discharged through the water inlet end, the drainage channel and the drain trough; when wading, after water enters the valve body, the valve core slider moves upward under the action of buoyancy, closes the drainage end, and prevents water from flowing back.

[0010] A car air-conditioning drain pipe water stop valve in an embodiment of the present application does not require electronic control components and relies on gravity and buoyancy to automatically switch states. It has a simple structure and a long service life. When wading through water, the buoyancy immediately drives the valve core slider to move upward, and the annular sealing gasket fits tightly against the valve seat to block the backflow path. The tubular structure is compatible with the standardized interface, and the cooperation of the four-way guide column and the limit plate ensures that there is no radial shaking after installation.

[0011] In addition, the automobile air-conditioning drain pipe water stop valve proposed in the present application may also have the following additional technical features:

[0012] In one embodiment of the present application, the two limit plates are fixed in a cross-shaped manner, with the horizontal section supporting the lower end surface of the valve core slider and the vertical section embedded in the slot of the valve body shell to achieve radial fixation, thereby ensuring the stability of the limit plate inside the valve body and the stroke constraint of the valve core slider.

[0013] In one embodiment of the present application, the bottom of the valve core slider is a flat sealing end, and an annular sealing gasket is fixed on the upper surface; an annular valve seat is provided inside the valve body shell, and its inner diameter is adapted to the outer diameter of the valve core slider; when the valve core slider floats up due to buoyancy, the annular sealing gasket at the flat sealing end fits tightly with the upper surface of the annular valve seat to form a flat sealing structure, effectively blocking the water backflow path.

[0014] In one embodiment of the present application, the planar sealing end and the annular sealing gasket are both made of PU foam material.

[0015] The advantages of this application compared with the existing technology are:

[0016] (1) Pure physical drive, maintenance-free: No electronic control components are required, and the state is automatically switched by gravity and buoyancy. It has a simple structure and a long service life.

[0017] (2) Rapid response and reliable sealing: It can drain the condensed water from the air conditioner in the car normally and prevent the water outside the car from flowing back into the car. When wading through water, the buoyancy immediately drives the valve core slider to move upward, and the annular sealing gasket fits tightly with the valve seat to block the backflow path.

[0018] (3) Compact structure and easy installation: The tubular structure is compatible with the standardized interface, and the cooperation between the four-way guide column and the limit plate ensures that there is no radial shaking after installation.

[0019] The biggest difference from other water stop valves is that their valve core is a sphere, while this technical solution adopts a top hemisphere and a lower cylinder.

[0020] There are two advantages: First, the spherical body processing technology cannot guarantee 100% concentricity (that is, there is a loss of roundness), and this technical solution adopts mold shaping processing. Because the four-column guide in the shell can only slide up and down, the sealing surface of the head is always facing upward, maintaining 100% concentricity and good sealing with the shell (the sphere will roll during use and will not fit well due to the loss of roundness).

[0021] Second, because the lower part is cylindrical, the overall volume increases, and the buoyancy also increases accordingly.

[0022] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0024] Figure 1 This is a perspective view of a water stop valve for an automobile air-conditioning drain pipe according to one embodiment of the present application;

[0025] Figure 2 This is a perspective view of a water stop valve for an automobile air-conditioning drain pipe according to another embodiment of the present application;

[0026] Figure 3 This is a cross-sectional perspective view of a normally open state of a water stop valve for a drain pipe of an automobile air conditioner according to one embodiment of the present application;

[0027] Figure 4 This is a sectional perspective view of a closed state water stop valve for an automobile air-conditioning drain pipe according to one embodiment of the present application;

[0028] Figure 5 This is a schematic cross-sectional view of a water stop valve for a drain pipe of an automobile air conditioner according to one embodiment of the present application;

[0029] Figure 6 This is a structural schematic diagram of the installation status of a water stop valve for a car air-conditioning drain pipe according to an embodiment of the present application.

[0030] As shown in the figure: 1. Valve body shell; 11. Water inlet end; 12. Drain end; 13. Slot; 14. Drain hole;

[0031] 2. Valve core slider; 21. Flat sealing end; 22. Ring sealing gasket;

[0032] 3. Limit plate;

[0033] 4. Four-way guide column; 41. Drainage channel;

[0034] 5. Annular valve seat. DETAILED DESCRIPTION

[0035] The embodiments of the present application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application and are not to be construed as limiting the present application. On the contrary, the embodiments of the present application include all variations, modifications, and equivalents that fall within the spirit and scope of the appended claims.

[0036] The following describes a water stop valve for an automobile air-conditioning drain pipe according to an embodiment of the present application in conjunction with the accompanying drawings.

[0037] like Figures 1-6 As shown, a water stop valve for an automobile air-conditioning drain pipe according to an embodiment of the present application may include a valve body shell 1 , a valve core slider 2 , two limit plates 3 , and a four-way guide column 4 .

[0038] It is understandable that the valve body shell 1 is a tubular structure with two ends open. Its axial ends are respectively the water inlet end 11 and the water outlet end 12:

[0039] The water inlet end 11 is connected to the upstream of the automobile air conditioning drain pipe to ensure the inflow of condensed water;

[0040] A circular drain hole 14 is provided at the center of the end surface of the drain end 12 for draining condensed water under normal conditions;

[0041] Four slots 13 are evenly formed on the side wall near the water inlet end 11 . The slots 13 are rectangular grooves for embedding the limiting plates 3 .

[0042] The vertical sections of the two limit plates 3 are embedded in the slots 13 on the inner wall of the valve body shell 1 and fixed by interference fit to achieve radial positioning;

[0043] The horizontal section of the limit plate 3 extends upward to form a supporting surface for the valve core slider 2. The supporting surface is perpendicular to the axial direction of the valve body shell 1 to ensure that the valve core slider 2 remains horizontal when falling.

[0044] The four-way guide column 4 is composed of four columnar protrusions perpendicular to the inner wall of the valve body shell 1, evenly distributed around the circumference (at intervals of 90 degrees), and has the following specific features:

[0045] The height of the guide column is 1 / 2 of the length of the valve body shell 1, ensuring that the valve core slider 2 is constrained by the guide when sliding throughout the entire stroke;

[0046] The side wall of the guide column fits with the outer wall of the valve core slider 2 to form a sliding fit, limiting the radial shaking of the valve core slider 2;

[0047] The gap between the guide column and the inner wall of the valve body shell 1 forms a drainage channel 41 to ensure smooth flow of condensed water.

[0048] The valve core slider 2 is a cylindrical structure and is coaxially arranged inside the valve body shell 1. The assembly points include:

[0049] The side wall is provided with a slide groove adapted to the four-way guide column 4, and the depth of the slide groove is consistent with the height of the guide column to achieve axial sliding guidance;

[0050] The density of the material of the valve core slider 2 is less than that of water, ensuring that it moves upward due to buoyancy when wading;

[0051] Under normal conditions, the valve core slider 2 falls under the action of gravity, and its lower end surface abuts against the horizontal section of the limit plate 3. At this time, the drain hole 14 of the drain end 12 is in an open state.

[0052] Detailed workflow:

[0053] 1. Normal drainage status

[0054] 1. Water flow path:

[0055] Air conditioning condensate flows into the valve body shell 1 from the water inlet end 11 , flows downward through the drainage channel 41 between the four-way guide column 4 and the inner wall of the valve body shell 1 , and is finally discharged from the drain hole 14 of the drainage end 12 .

[0056] 2. Component status:

[0057] The valve core slider 2 falls under the action of gravity and abuts the horizontal section of the limit plate 3. There is no gap between its lower end surface and the limit plate 3, ensuring that the falling stroke is in place;

[0058] The drainage channel 41 is completely through-flowing to prevent condensed water from being retained.

[0059] 2. Water-sealed status

[0060] 1. Trigger conditions:

[0061] When the car is wading, water flows back into the valve body housing 1 from the drainage end 12, and the water level rises to the bottom of the valve core slider 2.

[0062] 2. Action process:

[0063] The valve core slider 2 is affected by the buoyancy of the water and overcomes the gravity to slide upward;

[0064] The four-way guide post 4 constrains the sliding direction of the valve core slider 2, ensuring that it moves vertically upward along the axial direction to avoid deviation and seal failure;

[0065] When the valve core slider 2 moves upward to the drainage end 12, its lower end surface fits against the edge of the drain hole 14 to form a preliminary seal, preventing water from continuing to flow back.

[0066] 3. Sealing reliability:

[0067] The upward movement of the valve core slider 2 is determined by the axial distance between the limit plate 3 and the drainage end 12, ensuring that the drain hole 14 is completely covered after the upward movement. The deeper the water, the greater the buoyancy and the tighter the sealing surface fits.

[0068] In one embodiment of the present application, Figures 1-6 As shown, the two limit plates 3 are fixed in a cross-shaped manner, with the horizontal section supporting the lower end surface of the valve core slider 2, and the vertical section embedded in the slot 13 of the valve body shell 1 to achieve radial fixation, ensuring the stability of the limit plate 3 inside the valve body and the stroke constraint of the valve core slider 2.

[0069] It can be understood that the four walls of the slot 13 form a circumferential constraint on the vertical section 312 , limiting the rotation or displacement of the limit plate 3 in the valve body housing 1 ;

[0070] After being fixed, the cross structure of the two limit plates 3 forms a rigid frame, ensuring that no deformation occurs when water flow impacts or the valve core slider 2 slides.

[0071] When the valve core slider 2 falls due to gravity:

[0072] The lower end surface abuts against the horizontal section. At this time, the axial position of the valve core slider 2 is limited, ensuring that the drain hole 14 of the drain end 12 is in an open state.

[0073] In one embodiment of the present application, Figures 1-6 As shown, the bottom of the valve core slider 2 is a flat sealing end 21, and an annular sealing gasket 22 is fixed on the upper surface. An annular valve seat 5 is provided inside the valve body shell 1, and its inner diameter is adapted to the outer diameter of the valve core slider 2. When the valve core slider 2 floats up due to buoyancy, the annular sealing gasket 22 of the flat sealing end 21 fits tightly with the upper surface of the annular valve seat 5 to form a flat sealing structure, which effectively blocks the water backflow path.

[0074] It is understood that the bottom of the valve core slider 2 is processed into a flat sealing end 21 to ensure sealing when it fits against the annular valve seat 5. The upper surface of the flat sealing end 21 is fixed with an annular sealing gasket 22 through a vulcanization process. The specific requirements are:

[0075] The inner diameter of the annular sealing gasket 22 is 1 mm smaller than the outer diameter of the valve core slider 2, and the outer diameter is 1 mm larger than the inner diameter of the annular valve seat 5, forming an interference seal.

[0076] The working process of the sealing mechanism:

[0077] 1. Normal non-sealed state

[0078] 1. Component position relationship:

[0079] The valve core slider 2 falls to the limit plate 3 under the action of gravity. At this time, the annular sealing gasket 22 is not in contact with the upper surface of the valve seat, and the drain hole 14 of the drain end 12 is open.

[0080] 2. Water flow path:

[0081] The air conditioning condensate flows in from the water inlet 11, passes through the drainage channel 41 between the four-way guide column 4 and the valve body, and is discharged from the drain hole 14. At this time, the sealing structure does not participate in the work.

[0082] 2. Water-sealed status

[0083] 1. Trigger and action process:

[0084] When water flows back into the valve body from the drainage end 12, the valve core slider 2 moves upward due to the buoyancy and slides axially along the four-way guide column 4;

[0085] The annular sealing gasket 22 of the plane sealing end 21 gradually approaches the annular valve seat 5. When the buoyancy is greater than or equal to the weight of the slider plus the water flow resistance, the sealing gasket contacts the upper surface of the valve seat.

[0086] 2. Seal formation and reliability:

[0087] The annular sealing gasket 22 generates elastic deformation due to interference fit, filling the microscopic gap of the sealing surface to form a plane seal;

[0088] The deeper the water, the greater the buoyancy, and the fitting pressure between the sealing gasket and the valve seat increases accordingly, effectively blocking the backflow of water.

[0089] In one embodiment of the present application, Figures 1-6 As shown, the plane sealing end 21 and the annular sealing gasket 22 are both made of PU foam material.

[0090] It can be understood that the valve core slider 2 falls under the action of gravity, and the lower end face of the planar sealing end 21 abuts the horizontal section of the limit plate 3. At this time, the annular sealing gasket 22 is separated from the upper surface of the annular valve seat 5, and the distance between the two is the falling stroke of the valve core slider 2 (constrained by the limit plate 3).

[0091] PU foam material characteristics and functions:

[0092] PU foaming density is low (≤0.1g / cm 3 ), the valve core slider 2 is light in weight as a whole, and under normal conditions, gravity is sufficient to overcome the water flow resistance of the drainage channel 41, ensuring that the slider falls stably.

[0093] The PU foam structure of the planar sealing end 21 and the annular sealing gasket 22 is in a natural porous state, is not squeezed, and has no elastic deformation capability.

[0094] Water flow path:

[0095] Air conditioning condensate flows from the water inlet 11 into the valve housing 1, flows downward through the drainage channel 41 between the four-way guide post 4 and the inner wall of the valve housing 1, and is discharged from the drain hole 14 of the drainage end 12. At this time, the flat sealing end 21 and the annular sealing gasket 22 do not contact the annular valve seat 5, and the water flow is unobstructed.

[0096] 1. Water-sealed status

[0097] 1. Trigger conditions and buoyancy drive:

[0098] When the car is wading, water flows back into the valve body shell 1 from the drainage end 12, and the water level rises to the bottom of the valve core slider 2. Since the flat sealing end 21 and the annular sealing gasket 22 are made of PU foam material, the density is significantly lower than that of water (the density of PU foam is usually 0.03-0.1g / cm 3 , water is 1g / cm 3 ), the buoyancy of the valve core slider 2 as a whole is Fbuoyancy = ρwatergVdrain. When Fbuoyancy > slider gravity G, the slider slides axially upward along the four-way guide column 4.

[0099] 2. Sealing surface fitting process:

[0100] When the valve core slider 2 moves upward, the annular sealing gasket 22 of the flat sealing end 21 moves synchronously with the slider to approach the annular valve seat 5. When designed, the outer diameter of the annular sealing gasket 22 is 0.5-1mm larger than the inner diameter of the annular valve seat 5 (interference fit) to ensure extrusion when in contact.

[0101] Elastic sealing mechanism of PU foam:

[0102] When the porous structure inside the PU foam is under pressure, the pores are compressed, and the surface of the material fits tightly with the upper surface of the annular valve seat 5, filling the microscopic uneven gaps (for example, when the surface roughness of the valve seat Ra≤1.6μm, the compression deformation of the PU foam can cover the gap of 0.1~0.5μm), forming a physical blocking layer.

[0103] The deeper the water, the greater the buoyancy, the more complete the upward stroke of the slider, and the fitting pressure P=Fbuoy / S (S is the contact area of ​​the sealing gasket) between the annular sealing gasket 22 and the annular valve seat 5 increases accordingly. The sealing reliability increases with the increase of water pressure.

[0104] 3. Backflow blocking effect:

[0105] The water backflow path is blocked by the combined sealing surface of the flat sealing end 21 and the annular sealing gasket 22. At this time, the elastic deformation ability of the PU foam material and the buoyancy drive form a synergistic effect to ensure that water cannot enter the air-conditioning system in a short time.

[0106] 2. Reset process after wading

[0107] 1. Water level drop and gravity reset:

[0108] After the car leaves the flooded area, the water level in the valve housing 1 drops, and the buoyancy F on the valve core slider 2 decreases. <G时,滑块在重力作用下沿四向导向柱4回落,平面密封端21的下端面再次抵接限位板3的水平段,复位行程由限位板3的水平段高度精确控制。

[0109] 2. Recovery characteristics of PU foam materials:

[0110] After the annular sealing gasket 22 is released from the extrusion of the annular valve seat 5, the elastic memory effect of the PU foam gradually restores its original porous structure, the sealing surface gap is reopened, and the drain hole 14 of the drainage end 12 is restored to be unobstructed.

[0111] Specifically, in the actual implementation process, when the automobile air-conditioning drain pipe water stop valve is installed on the air-conditioning drain pipe with the water inlet end 11 facing upward and the drain end 12 facing downward, the specific working process is as follows:

[0112] When the water check valve is installed on the vehicle air conditioning drain pipe with the water inlet end 11 facing upward and the drain end 12 facing downward, during normal vehicle operation, air conditioning condensate flows from the water inlet end 11 into the valve body housing 1, flows downward through the four-way guide column 4 and the drainage channel 41 on the inner wall of the valve body housing 1, and is discharged from the drain hole 14 at the drainage end 12. At this time, the valve core slider 2 falls under the action of gravity, the flat sealing end 21 abuts the horizontal section of the limit plate 3, the annular sealing gasket 22 separates from the annular valve seat 5, and the drainage channel 41 remains unobstructed.

[0113] When a vehicle wades through water, water flows back through the drain port 12 into the valve housing 1, causing the water level to rise to the bottom of the valve core slider 2. Because the flat sealing end 21 and the annular sealing gasket 22 are both made of PU foam, the valve core slider 2 is driven upward along the four-way guide post 4 by buoyancy. The annular sealing gasket 22 contacts and squeezes the upper surface of the annular valve seat 5, creating an interference fit and forming a sealing surface that blocks the path for water backflow. The deeper the water, the greater the buoyancy, the greater the contact pressure between the annular sealing gasket 22 and the annular valve seat 5, and the more reliable the seal.

[0114] After the vehicle leaves the flooded area, the water level in the valve body shell 1 drops, the buoyancy of the valve core slider 2 decreases, and under the action of gravity, it falls back along the four-way guide column 4. The flat sealing end 21 abuts the horizontal section of the limit plate 3 again, the annular sealing gasket 22 separates from the annular valve seat 5 and returns to its natural state, the drain hole 14 reopens, and the water stop valve resumes its normal drainage function, completing a complete working cycle.

[0115] In summary, a car air-conditioning drain pipe water stop valve in an embodiment of the present application does not require electronic control components, relies on gravity and buoyancy to automatically switch states, has a simple structure and a long service life. When wading through water, the buoyancy immediately drives the valve core slider to move upward, and the annular sealing gasket fits tightly against the valve seat to block the backflow path. The tubular structure is compatible with the standardized interface, and the cooperation of the four-way guide column and the limit plate ensures that there is no radial shaking after installation.

[0116] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0117] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0118] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and deform the above embodiments within the scope of the present application.

Claims

1. A water stop valve for automobile air-conditioning drain pipe, characterized in that: It comprises a valve body shell (1), a valve core slider (2), two limit plates (3), and a four-way guide column (4), wherein: The valve body shell (1) is a tubular structure, with two axial ends respectively being a water inlet end (11) and a water discharge end (12). Four slots (13) are provided on the side wall close to the water inlet end (11), and a circular drain hole (14) is provided at the center of the end surface of the water discharge end (12) for draining water under normal conditions. The valve core slider (2) is coaxially arranged inside the valve body shell (1) and can slide in the axial direction; The two limit plates (3) are cross-fixed, and the ends are embedded in the slots (13) on the inner wall of the valve body shell (1). The lower end surface of the valve core slider (2) is supported by the horizontal section to constrain it within a predetermined stroke to prevent it from sliding beyond the limit. The four-way guide column (4) is composed of four guide columns vertically protruding from the inner wall of the valve body shell (1) and evenly distributed around the circumference, and its side wall is in contact with the valve core slider (2) to form an axial sliding guide structure; The side wall of the valve core slider (2) cooperates with the four-way guide column (4) to form axial sliding; A drainage channel (41) is formed between the four-way guide column (4) and the inner wall of the valve body shell (1), ensuring smooth water flow under normal conditions; Under normal conditions, the valve core slider (2) abuts against the horizontal section of the limit plate (3) due to gravity, the drainage end (12) is open, and the air conditioning condensate is discharged through the water inlet end (11), the drainage channel (41) and the drain trough (14); When water enters the valve body during wading, the valve core slider (2) moves upward due to the buoyancy, closing the drainage end (12) and preventing water from flowing back.

2. The automobile air-conditioning drain pipe water stop valve according to claim 1, characterized in that: The two limit plates (3) are fixed in a cross-shaped manner, with the horizontal section supporting the lower end surface of the valve core slider (2) and the vertical section being embedded in the slot (13) of the valve body shell (1) to achieve radial fixation, thereby ensuring the stability of the limit plate 3 inside the valve body and restricting the stroke of the valve core slider.

3. The automobile air-conditioning drain pipe water stop valve according to claim 1, characterized in that: The bottom of the valve core slider (2) is a flat sealing end (21), and an annular sealing gasket (22) is fixed on the upper surface; An annular valve seat (5) is provided inside the valve body shell (1), the inner diameter of which is adapted to the outer diameter of the valve core slider (2); When the valve core slider (2) floats upward due to buoyancy, the annular sealing gasket (22) of the plane sealing end (21) fits tightly with the upper surface of the annular valve seat (5), forming a plane sealing structure, which effectively blocks the water backflow path.

4. The automobile air-conditioning drain pipe water stop valve according to claim 3, characterized in that: The plane sealing end (21) and the annular sealing gasket (22) are both made of PU foam material.

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