A drip-proof device for a car windshield washer pump

Abstract

This utility model relates to the field of automotive windshield wiper technology and discloses an anti-drip device for an automotive windshield wiper washer pump. It includes a washer pump and a needle valve assembly disposed at the outlet of the washer pump. The needle valve assembly includes a valve seat, a nozzle, a valve needle, and an elastic element. The valve seat has a channel with an inlet at one end communicating with the outlet of the washer pump and an outlet at the other end communicating with the nozzle. The valve needle is slidably disposed between the nozzle and the outlet. The elastic element is disposed between the valve needle and the nozzle. The valve needle has a pressure-reducing ring. With the pressure-reducing ring on the valve needle, when the spraying stops, the valve needle drives the pressure-reducing ring to slide in the opposite direction of the water flow, so that the pressure-reducing ring exerts a counteracting force on the water in the channel, thus counteracting the inertial force of the water in the channel. This prevents water from continuing to flow out of the channel and causing dripping when the washer pump stops working, thus avoiding any impact on driving safety due to dripping.

Description

Technical Field

[0001] This utility model relates to the field of automotive windshield wiper technology, and more specifically, to an anti-drip device for an automotive windshield wiper washer pump. Background Technology

[0002] Automotive windshield washer pump assemblies are relatively mature products, widely used in the automotive industry. This washer pump mainly consists of a washer pump, a main nozzle, and connecting water pipes. The washer pump provides power, pressurizing the washer fluid (water), which is then delivered to the nozzle through the water pipes. From the nozzle, the washer fluid is sprayed onto the car windshield to clean it.

[0003] The aforementioned washer pump assembly has a defect: when the washer pump stops working, the washer pump, connecting water pipes, and nozzles are still full of water. Due to the inertial force of the water in the channel in the direction of water flow, some water continues to flow towards the nozzles, causing dripping from the nozzles. This reduces glass cleanliness, impairs driving visibility, and affects driving safety. The specific reasons why nozzle dripping affects glass cleanliness are as follows: 1. When the washer pump is working, sufficient pressure is needed to spray the washer fluid evenly onto the glass, forming a mist or fan-shaped water curtain so that the wipers can effectively remove dirt. If the nozzles drip, it means that liquid is still slowly flowing out after the pump stops, causing the next spray to be interrupted. 1. Insufficient initial pressure results in a smaller spray range, failing to cover the entire cleaning area; 2. Water dripping from the nozzle forms localized water stains on the glass, which may be dragged into streaks by the wipers instead of being cleaned evenly; after drying, these residual detergents may leave watermarks or stains, affecting the glass's transparency; 3. Repeated dripping from the nozzle causes the detergent to slowly drain, potentially depleting the reservoir prematurely; when cleaning is truly needed, insufficient detergent reduces the spray volume and decreases the cleaning effect; 4. Water dripping in low temperatures may freeze at the nozzle, causing blockage and hindering subsequent spraying, resulting in poor cleaning performance. Utility Model Content

[0004] To address at least one of the aforementioned problems, this utility model provides an anti-drip device for a car windshield washer pump, comprising a washer pump and a needle valve assembly disposed at the outlet end of the washer pump. The needle valve assembly includes a valve seat, a nozzle, a valve needle, and a resilient element. The valve seat has a channel; one end of the channel has an inlet communicating with the outlet end of the washer pump, and the other end has an outlet communicating with the nozzle. The valve needle is slidably disposed between the nozzle and the outlet, and the resilient element is disposed between the valve needle and the nozzle. The valve needle is equipped with a pressure-reducing ring, which is slidably positioned within the channel. During water spraying, water flows into the channel, and the water pressure within the channel causes the valve needle to disengage from the outlet, allowing the water in the channel to flow to the outlet nozzle for discharge. When water spraying ends, the flow of water into the channel is stopped, and the elastic force of the elastic element causes the valve needle to move closer to the outlet. The valve needle then causes the pressure-reducing ring to slide in the opposite direction of the water discharge, so that the pressure-reducing ring exerts a counteracting force on the water in the channel in the opposite direction to counteract the inertial force of the water in the channel.

[0005] Optionally, a water guide groove is provided on the valve needle along the extension direction of the channel, and the pressure reducing ring is located at the end of the water guide groove away from the water inlet.

[0006] Optionally, the pressure-reducing ring is circular, and several water guide grooves are provided along the circumference of the pressure-reducing ring. The outer wall of the pressure-reducing ring slides into contact with the inner wall of the channel.

[0007] Optionally, the valve needle is provided with an annular conical surface, and the outlet is provided with an annular guide slope corresponding to the annular conical surface. The valve needle abuts against the annular guide slope through the annular conical surface to seal the channel.

[0008] Optionally, the elastic element is a compression spring, with one end of the elastic element abutting against the water outlet and the other end of the elastic element abutting against the valve needle.

[0009] Optionally, the water outlet is provided with a mounting groove for mounting one end of the elastic element, and the valve needle is provided with a boss for fitting the other end of the elastic element.

[0010] Optionally, the valve seat includes a first seat and a second seat, the channel is disposed on the first seat, the washing pump is provided with an inner flange, the first seat is provided with an outer flange that abuts against and limits the inner flange, the water outlet is connected to the washing pump, and the second seat abuts between the outer flange and the water outlet.

[0011] Optionally, a first annular guide post is provided on the side of the water outlet near the second seat, and a second annular guide post is provided on the side of the washing pump near the water outlet. The first annular guide post is connected to the inner side of the second annular guide post, and the second seat abuts against the outer flange and the first annular guide post.

[0012] Optionally, the first annular guide post and the second annular guide post are threadedly connected or plugged in.

[0013] Optionally, the anti-drip device of the car wiper washer pump further includes a water outlet valve connected to the water outlet nozzle. The water outlet valve is provided with a water inlet chamber, a water outlet head, and a connecting chamber for connecting the water inlet chamber and the water outlet head. The water inlet chamber is connected to the water outlet nozzle, and the water outlet head is connected to the external wiper nozzle.

[0014] Compared to existing technologies, the anti-drip device for the car wiper washer pump in this invention features a pressure-reducing ring on the valve needle. When the water spraying stops, the valve needle drives the pressure-reducing ring to slide in the opposite direction of the water outlet, creating a counteracting force on the water in the channel. This counteracts the inertial force of the water in the channel, preventing water from continuing to flow out and dripping when the washer pump stops working, thus avoiding any impact on driving safety. A water guide groove is provided on the valve needle along the channel's extension direction, allowing water to flow out along the groove during spraying, resulting in a more stable water flow. An annular conical surface is provided on the valve needle, and an annular guide slope corresponding to the conical surface is provided at the outlet. The valve needle abuts against the annular guide slope through the conical surface to seal the channel. The contact between the conical surface and the guide slope is stable, providing a good seal. An installation groove is provided on the nozzle, and a boss is provided on the valve needle, ensuring a secure installation of the elastic element and preventing displacement, thus ensuring smooth expansion and contraction of the elastic element. Attached Figure Description

[0015] Figure 1 This is a partial sectional view of the anti-drip device for the car wiper washer pump of this utility model;

[0016] Figure 2 for Figure 1 Enlarged view of section A in the middle;

[0017] Figure 3 This is a cross-sectional view of the anti-drip device for the car windshield wiper washer pump of this utility model;

[0018] Figure 4 This is a front view of the valve needle of the anti-drip device for the car windshield wiper washer pump of this utility model;

[0019] Figure 5 This is a bottom view of the valve needle of the anti-drip device for the car windshield wiper washer pump according to this utility model;

[0020] Figure 6 This is a cross-sectional view of the first body of the anti-drip device for the car wiper washer pump of this utility model;

[0021] The component names corresponding to the various reference numerals in the figure are as follows: 1 is the washing pump, 101 is the inner flange, 102 is the second annular guide post, 2 is the water outlet valve, 21 is the water inlet chamber, 22 is the water outlet head, 23 is the connecting chamber, 3 is the valve seat, 301 is the annular guide slope, 31 is the channel, 32 is the water inlet, 33 is the water outlet, 34 is the second seat, 35 is the first seat, 351 is the outer flange, 4 is the water outlet, 401 is the mounting groove, 402 is the first annular guide post, 5 is the valve needle, 501 is the pressure reducing ring, 502 is the water guide groove, 503 is the annular conical surface, 504 is the boss, and 6 is the elastic element. Detailed Implementation

[0022] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0023] In the description of this utility model, it should be understood that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship when the product is in normal use.

[0024] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature.

[0025] See Figures 1-6 This utility model provides an anti-drip device for a car windshield washer pump, including a washer pump 1 and a needle valve assembly disposed at the outlet end of the washer pump 1. The needle valve assembly includes a valve seat 3, a nozzle 4, a needle 5, and an elastic element 6. The valve seat 3 is provided with a channel 31, one end of which is provided with an inlet 32 ​​communicating with the outlet end of the washer pump 1, and the other end of which is provided with an outlet 33 communicating with the nozzle 4. The needle 5 is slidably disposed between the nozzle 4 and the outlet 33. The elastic element 6 is disposed between the needle 5 and the nozzle 4. The needle 5 is provided with a pressure-reducing ring 501. The pressure-reducing ring 501 is slidably placed in the channel 31. When spraying water, water is introduced into the channel 31. The water pressure in the channel 31 drives the valve needle 5 to disengage from the outlet 33, so that the water in the channel 31 flows to the outlet 4 for water discharge. When the water spraying ends, the water supply to the channel 31 is stopped. The elastic force of the elastic element 6 drives the valve needle 5 to approach the outlet 33. The valve needle 5 drives the pressure-reducing ring 501 to slide in the opposite direction of the water discharge direction, so that the pressure-reducing ring 501 generates a counteracting force on the water in the channel 31 in the opposite direction, so as to counteract the inertial force of the water in the channel 31, thereby reducing the problem of water dripping from the wiper nozzle.

[0026] Specifically, the anti-drip function of this utility model is further explained as follows: At the instant the washing pump 1 stops working, the valve needle 5 falls back under the elastic force of the elastic element 6. The valve needle 5 falls back to the valve seat 3, instantly generating a negative water pressure (i.e., a pressure on the water opposite to the direction of water flow). This pressure reduces the water pressure (i.e., inertial force) in the direction of water flow, and the negative water pressure cancels out most of the inertial force that would otherwise form water droplets. Additionally, it should be noted that: Figure 1 This is a partial sectional view of the anti-drip device for the car wiper washer pump of this utility model. Figure 1 Valve needle 5 in the image is in a state where it has not been cross-sectionally viewed.

[0027] See Figure 1 , Figure 2 , Figure 4 and Figure 5 A water guide groove 502 is provided on the valve needle 5 along the extension direction of the channel 31, so that the water in the channel 31 can flow out along the water guide groove 502 when spraying water, and the water flow is more stable. The pressure reducing ring 501 is provided at the end of the water guide groove 502 away from the water inlet 32, so that the pressure reducing ring 501 can be separated from the channel 31 in the direction of water outlet when spraying water. The pressure reducing ring 501 is circular, and the channel 31 is also a circular channel. Several water guide grooves 502 are provided along the circumference of the pressure reducing ring 501. In this embodiment, four water guide grooves 502 are provided. The outer side wall of the pressure reducing ring 501 slides with the inner side wall of the channel 31. Specifically, the diameter of the pressure reducing ring 501 is slightly smaller than the inner diameter of the channel 31.

[0028] See Figures 1-4 The valve needle 5 is provided with an annular conical surface 503, and the outlet 33 is provided with an annular guide slope 301 corresponding to the annular conical surface 503. The valve needle 5 abuts against the annular guide slope 301 through the annular conical surface 503 to seal the channel 31. The annular conical surface 503 and the annular guide slope 301 abut against each other stably, resulting in a good sealing effect. The elastic element 6 is a compression spring. One end of the elastic element 6 abuts against the outlet 4, and the other end of the elastic element 6 abuts against the valve needle 5. The structure is simple and the production cost is low. (See reference...) Figure 4 This is the front view of valve needle 5. Valve needle 5 is a rotating part, and its rear view, left view, and right view are the same as or nearly the same as the front view.

[0029] See Figure 3 The water outlet 4 is provided with a mounting groove 401 for mounting one end of the elastic element 6, and the valve needle 5 is provided with a boss 504 for mounting the other end of the elastic element 6. The elastic element 6 is installed firmly and is not easy to displace, so that the elastic element 6 can extend and retract smoothly.

[0030] See Figure 1 , Figure 2 and Figure 6The valve seat 3 includes a first seat body 35 and a second seat body 34. A channel 31 is disposed on the first seat body 35. An inner flange 101 is disposed on the washing pump 1. An outer flange 351 is disposed on the first seat body 35, which abuts against and limits the inner flange 101. A water outlet 4 is connected to the washing pump 1. The second seat body 34 abuts against the outer flange 351 and the water outlet 4. During assembly, the water outlet 4 presses the first seat body 35 onto the washing pump 1 through the second seat body 34. The structure is reasonably designed.

[0031] See Figures 1-3 A first annular guide post 402 is provided on the side of the water outlet 4 near the second seat 34, and a second annular guide post 102 is provided on the side of the washing pump 1 near the water outlet 4. The first annular guide post 402 is connected to the inner side of the second annular guide post 102. The second seat 34 abuts against the outer flange 351 and the first annular guide post 402. The water outlet 4 can be connected to the washing pump 1 through the first annular guide post 402, and can also be fixed by pressing the second seat 34 and the first seat 35 through the first annular guide post 402. The first annular guide post 402 and the second annular guide post 102 are connected to the second annular guide post 402. The column 102 is threaded or plugged in, making assembly simple. The anti-drip device for the car wiper washer pump of this utility model also includes a water outlet valve 2 that is threadedly connected to the water outlet 4. The water outlet valve 2 can also be connected to the water outlet 4 by plugging in. The water outlet valve 2 is provided with an inlet chamber 21, a water outlet head 22, and a connecting chamber 23 for connecting the inlet chamber 21 and the water outlet head 22. The inlet chamber 21 is connected to the water outlet 4, and the water outlet head 22 is connected to the external wiper nozzle through a water pipe. When in use, the washer pump 1 is powered on to work, thereby realizing the function of the wiper nozzle spraying water.

[0032] The anti-drip device for the car wiper washer pump in this utility model features a pressure-reducing ring on the valve needle. When the water spraying stops, the valve needle drives the pressure-reducing ring to slide in the opposite direction of the water outlet, so that the pressure-reducing ring generates a counteracting force on the water in the channel, thus counteracting the inertial force of the water in the channel. This prevents water from continuing to flow out of the channel and causing dripping at the moment the washer pump stops working, avoiding the problem of dripping affecting driving safety. A water guide groove is provided on the valve needle along the extension direction of the channel, so that the water in the channel can flow out along the water guide groove during water spraying, making the water flow more stable. An annular conical surface is provided on the valve needle, and an annular guide slope corresponding to the annular conical surface is provided at the water outlet. The valve needle abuts against the annular guide slope through the annular conical surface to seal the channel. The annular conical surface and the annular guide slope are stably abutted, and the sealing effect is good. An installation groove is provided on the water outlet, and a boss is provided on the valve needle. The elastic element is firmly installed and not easy to displace, so that the elastic element's expansion and contraction process is smooth.

[0033] In the description of this disclosure, it should be understood that the terms "upper", "lower", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure.

[0034] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include at least one of that feature. In the description of this disclosure, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0035] In this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0036] In this disclosure, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first feature or in indirect contact with the first feature through an intermediate medium.

[0037] It should be noted that when a component is described as being "set on" another component, it can be directly on the other component or there may be an intervening component. When a component is described as "connected to another component," it can be directly connected to the other component or there may be an intervening component. Furthermore, when a component is described as being "fixedly connected" to another component, the connection can be detachable or non-detachable, such as through socketing, snap-fitting, integral molding, welding, etc., which are achievable in conventional technologies and will not be elaborated upon here.

[0038] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A drip-proof device for a car windshield washer pump, characterized in that, The device includes a washing pump (1) and a water outlet needle valve assembly disposed at the water outlet end of the washing pump (1). The water outlet needle valve assembly includes a valve seat (3), a water outlet (4), a valve needle (5), and an elastic element (6). The valve seat (3) is provided with a channel (31). One end of the channel (31) is provided with a water inlet (32) communicating with the water outlet end of the washing pump (1), and the other end of the channel (31) is provided with a water outlet (33) communicating with the water outlet (4). The valve needle (5) is slidably disposed between the water outlet (4) and the water outlet (33). The elastic element (6) is disposed between the valve needle (5) and the water outlet (4). The valve needle (5) is provided with a pressure reducing ring (501), and the pressure reducing ring (501) is slidably disposed in the channel (31). When water is sprayed, water is introduced into the channel (31), and the water pressure in the channel (31) drives the valve needle (5) to disengage from the outlet (33), so that the water in the channel (31) flows to the outlet (4) for water discharge; when the water spraying ends, the water supply to the channel (31) is stopped, and the elastic force of the elastic element (6) drives the valve needle (5) to approach the outlet (33), and the valve needle (5) drives the pressure reducing ring (501) to slide in the opposite direction of the water discharge direction, so that the pressure reducing ring (501) generates a counteracting force in the opposite direction on the water in the channel (31) to counteract the inertial force of the water in the channel (31).

2. The anti-drip device for the car wiper washer pump according to claim 1, characterized in that, A water guide groove (502) is provided on the valve needle (5) along the extension direction of the channel (31), and the pressure reducing ring (501) is provided at the end of the water guide groove (502) away from the water inlet (32).

3. The anti-drip device for the car wiper washer pump according to claim 2, characterized in that, The pressure-reducing ring (501) is circular, and several water guide grooves (502) are arranged along the circumference of the pressure-reducing ring (501). The outer wall of the pressure-reducing ring (501) slides in conjunction with the inner wall of the channel (31).

4. The anti-drip device for the car wiper washer pump according to claim 1, characterized in that, The valve needle (5) is provided with an annular conical surface (503), and the outlet (33) is provided with an annular guide slope (301) corresponding to the annular conical surface (503). The valve needle (5) abuts against the annular guide slope (301) through the annular conical surface (503) to seal the channel (31).

5. The anti-drip device for the car wiper washer pump according to claim 1, characterized in that, The elastic element (6) is a compression spring. One end of the elastic element (6) abuts against the water outlet (4), and the other end of the elastic element (6) abuts against the valve needle (5).

6. The anti-drip device for the car wiper washer pump according to claim 5, characterized in that, The water outlet (4) is provided with an installation groove (401) for installing one end of the elastic element (6), and the valve needle (5) is provided with a boss (504) for fitting the other end of the elastic element (6).

7. The anti-drip device for the car wiper washer pump according to claim 1, characterized in that, The valve seat (3) includes a first seat body (35) and a second seat body (34). The channel (31) is disposed on the first seat body (35). The washing pump (1) is provided with an inner flange (101). The first seat body (35) is provided with an outer flange (351) that abuts against and limits the inner flange (101). The water outlet (4) is connected to the washing pump (1). The second seat body (34) abuts between the outer flange (351) and the water outlet (4).

8. The anti-drip device for the car wiper washer pump according to claim 7, characterized in that, The water outlet (4) is provided with a first annular guide post (402) on the side near the second seat (34), and the washing pump (1) is provided with a second annular guide post (102) on the side near the water outlet (4). The first annular guide post (402) is connected to the inner side of the second annular guide post (102), and the second seat (34) abuts against the outer flange (351) and the first annular guide post (402).

9. The anti-drip device for the car wiper washer pump according to claim 8, characterized in that, The first annular guide post (402) is threaded or plugged into the second annular guide post (102).

10. The anti-drip device for a car windshield washer pump according to any one of claims 1-9, characterized in that, It also includes a water outlet valve (2) connected to the water outlet (4). The water outlet valve (2) is provided with an inlet chamber (21), an outlet head (22), and a connecting chamber (23) for connecting the inlet chamber (21) and the outlet head (22). The inlet chamber (21) is connected to the water outlet (4), and the outlet head (22) is connected to the external wiper nozzle.

Images