Water pump and automobile
By setting up spoiler components in the drain hole of the water pump to adjust the liquid flow rate, the problem of drain hole damage caused by cavitation is solved, and the complete emptying of coolant and the service life of the water pump are achieved.
Patent Information
- Application Number
- CN202422655622.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-09-02
- Estimated Expiration
- 2034-10-31
AI Technical Summary
The existing water pumps have damaged or broken down internally due to cavitation during operation, and there is a lack of effective solutions.
A liquid discharge hole is set between the cavity of the water pump and the liquid inlet pipe, and a spoiler assembly is installed in the liquid discharge hole to adjust the liquid flow rate to reduce the occurrence of cavitation.
Effectively drain the coolant in the cavity, reduce the generation of bubbles, protect the drain hole from damage, and extend the service life of the water pump.
Smart Images
Figure CN223293967U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of automobile technology, in particular to a water pump and an automobile. Background Art
[0002] A drainage hole is provided in the water pump, which can ensure that the coolant in the cavity is completely emptied when the coolant is replaced. Specifically, the drainage hole is located in the water pump or the module integrated with the water pump and is located in the flow channel, with a diameter between φ4-φ2. Due to its unique structural position, different pressure differences will be generated at both ends of the drainage hole during the operation of the water pump, and a small cycle will be formed. When the internal liquid pressure is lower than the saturated vapor pressure of the coolant, the gas inside the coolant will precipitate and form bubbles. The process of bubbles from nothing to explosion will cause damage or even puncture to the inside of the drainage hole, resulting in cavitation.
[0003] At present, there is no method to improve this cavitation problem. Therefore, there is an urgent need for a water pump and a car to solve the technical problems existing in the existing technology to a certain extent. Utility Model Content
[0004] The purpose of this application is to provide a water pump and a car that can, to a certain extent, solve the technical problem of damage or even breakdown inside the drainage hole caused by cavitation.
[0005] The present application provides a water pump, comprising a housing, a liquid inlet pipe, an impeller, and at least one liquid outlet pipe; a cavity is formed in the housing, and the impeller is disposed in the cavity; the liquid inlet pipe and the liquid outlet pipe are both connected to the cavity, and the liquid inlet pipe and the liquid outlet pipe extend in opposite directions; liquid introduced by the liquid inlet pipe can be discharged from the liquid outlet pipe through the impeller; the water pump also includes a drainage hole and a flow disturbance component;
[0006] The drainage hole at the bottom of the cavity connects the cavity with the liquid inlet pipe. When the liquid in the cavity needs to be drained, the liquid at the bottom of the cavity can be drained into the liquid inlet pipe through the drainage hole.
[0007] The cavity has a first pressure, and the liquid inlet pipe has a second pressure which is lower than the first pressure; when the water pump is working, at least part of the liquid in the cavity can be discharged into the liquid inlet pipe through the drainage hole; the spoiler component is arranged in the drainage hole, and the spoiler component can adjust the flow rate of the liquid flowing from the cavity to the liquid inlet pipe to reduce the occurrence of cavitation.
[0008] In the above technical solution, further, the spoiler assembly includes a pin body;
[0009] The pin body is arranged in the drainage hole, and a liquid through hole coaxial with the drainage hole is formed in the pin body;
[0010] The diameter of the liquid through hole is a variable diameter structure along the axial direction of the liquid through hole, so as to change the flow rate of the liquid flowing from the cavity to the liquid inlet pipe.
[0011] In the above technical solution, further, a thread groove is provided on the inner side wall of the pin body, so that the diameter of the liquid through hole is a variable diameter structure along the axial direction of the liquid through hole.
[0012] In the above technical solution, further, the spoiler assembly includes a pin body;
[0013] At least a portion of the inner side wall of the liquid through hole is wavy along the axial direction of the pin body, and the wavy inner side wall of the liquid through hole can make the diameter of the liquid through hole a variable diameter structure along the axial direction of the liquid through hole.
[0014] In the above technical solution, further, the top inner side wall of the pin body and the bottom inner side wall of the pin body are wavy along the axial direction of the pin body.
[0015] In the above technical solution, further, the spoiler assembly also includes a spring;
[0016] The spring is arranged in the liquid through hole and the extension direction of the spring is coaxial with the axial direction of the liquid through hole. The spring can make the diameter of the liquid through hole a variable diameter structure along the axial direction of the liquid through hole.
[0017] In the above technical solution, further, the pin body is welded to the drainage hole, and the spring is welded to the liquid through hole.
[0018] In the above technical solution, further, the pin body is made of spring steel or stainless steel.
[0019] In the above technical solution, further, the pin body is made of carbon steel or alloy steel.
[0020] The present application also provides a car, comprising the above-mentioned water pump.
[0021] Compared with the prior art, this application has the following beneficial effects:
[0022] The present application provides a water pump, comprising a housing, a liquid inlet pipe, an impeller, and at least one liquid outlet pipe; a cavity is formed in the housing, and the impeller is disposed in the cavity; the liquid inlet pipe and the liquid outlet pipe are both connected to the cavity, and the liquid inlet pipe and the liquid outlet pipe extend in opposite directions; liquid introduced by the liquid inlet pipe can be discharged from the liquid outlet pipe through the impeller; the water pump also includes a drainage hole and a flow disturbance component;
[0023] The drainage hole at the bottom of the cavity connects the cavity with the liquid inlet pipe. When the liquid in the cavity needs to be drained, the liquid at the bottom of the cavity can be drained into the liquid inlet pipe through the drainage hole.
[0024] The cavity has a first pressure, and the liquid inlet pipe has a second pressure which is lower than the first pressure; when the water pump is working, at least part of the liquid in the cavity can be discharged into the liquid inlet pipe through the drainage hole; the spoiler component is arranged in the drainage hole, and the spoiler component can adjust the flow rate of the liquid flowing from the cavity to the liquid inlet pipe to reduce the occurrence of cavitation.
[0025] In summary, the present application provides a drain hole between the bottom of the cavity and the liquid inlet pipe, and the coolant that cannot be discharged at the bottom of the cavity can be discharged through the drain hole, thereby ensuring that the coolant in the cavity is emptied, making it convenient for subsequent replacement of new coolant.
[0026] In addition, the present application provides a spoiler component in the drain hole, which can adjust the flow rate of the liquid flowing from the cavity to the liquid inlet pipe. Because it can adjust the pressure difference at both ends of the liquid in the drain hole to a certain extent, the pressure difference will not be too high, and thus can reduce the generation of bubbles to a certain extent, reduce the impact of bubbles on the inner wall of the drain hole, thereby ensuring the service life of the water pump.
[0027] The present application also provides a water pump, including the above-mentioned water pump, and thus has all the beneficial effects of the water pump, which will not be elaborated in detail here. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0029] Figure 1 A schematic diagram of the structure of the water pump provided in this application from a first perspective;
[0030] Figure 2 A schematic diagram of the structure of the water pump provided in this application from a second perspective;
[0031] Figure 3 A schematic diagram of the structure of the water pump provided in this application with an impeller hidden in it from a first-person perspective;
[0032] Figure 4 A schematic diagram of the structure of the water pump provided by this application with an impeller hidden in it from a second perspective;
[0033] Figure 5 A schematic diagram of the structure of the impeller in the water pump provided in this application;
[0034] Figure 6 A cross-sectional view of the water pump provided for this application;
[0035] Figure 7 for Figure 6 A magnified view of point A;
[0036] Figure 8 A cross-sectional view of a pin body in a water pump provided in this application;
[0037] Figure 9 This is a schematic diagram of the structure of the spring in the water pump provided in this application.
[0038] Figure numerals: 1-housing; 2-liquid inlet pipe; 3-impeller; 4-wavy; 5-first liquid outlet pipe; 6-second liquid outlet pipe; 7-cavity; 8-liquid discharge hole; 9-chamfer; 10-pin body; 11-liquid hole; 12-spring. DETAILED DESCRIPTION
[0039] The following detailed description is provided to help the reader gain a comprehensive understanding of the methods, devices, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will be apparent upon understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein. Rather, except for operations that must occur in a particular order, changes may be made that will be apparent upon understanding the disclosure of this application. Furthermore, descriptions of features known in the art may be omitted for clarity and brevity.
[0040] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many possible ways to implement the methods, devices, and / or systems described herein that will be apparent upon understanding the disclosure of this application.
[0041] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being “on,” “connected to,” “coupled to,” “over,” or “overlaying” another element, it may be directly “on,” “connected to,” “coupled to,” “over,” or “overlaying” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on,” “directly connected to,” “directly coupled to,” “directly over,” or “directly covering” another element, there may be no other elements intervening therebetween.
[0042] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.
[0043] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are used only to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Thus, a first member, component, region, layer, or portion in the examples described herein may also be referred to as a second member, component, region, layer, or portion without departing from the teachings of the examples.
[0044] For ease of description, spatial relational terms such as "above," "upper," "below," and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element would subsequently be "below" or "lower" relative to the other element. Thus, the term "above" includes both the orientations "above" and "below," depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.
[0045] The terms used herein are intended only to describe various examples and are not intended to limit the present disclosure. Unless the context clearly indicates otherwise, the singular is intended to include the plural. The terms "include," "comprising," and "having" list the presence of stated features, quantities, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.
[0046] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the drawings may occur. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include changes in shapes that occur during manufacturing.
[0047] The features of the examples described herein can be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.
[0048] Example 1
[0049] The following combination Figures 1-9 A water pump provided by the present application is described in detail.
[0050] The present application provides a water pump, which includes a housing 1, a liquid inlet pipe 2, an impeller 3 and at least one liquid outlet pipe; preferably, there are two liquid outlet pipes, namely a first liquid outlet pipe 5 and a second liquid outlet pipe 6; specifically, a cavity 7 is formed in the housing 1, and the impeller 3 is arranged in the cavity 7 (combined with Figure 5 As shown); the liquid inlet pipe 2, the first liquid outlet pipe 5 and the second liquid outlet pipe 6 are all connected to the cavity 7; combined Figure 1-Figure 3 As shown, and Figure 1-Figure 3 As a reference to the arrangement in the figure, the first liquid outlet pipe 5 and the second liquid outlet pipe 6 both extend in an upward direction, and the liquid inlet pipe 2 is bent and extends in a downward direction; in actual use, the liquid introduced by the liquid inlet pipe 2 (this liquid is explained in detail using the coolant as an example) can be discharged from the liquid outlet pipe through the rotation of the impeller 3 (the rotation of the impeller 3 can generate centrifugal motion, and then the coolant can be thrown from the liquid inlet pipe 2 to the liquid outlet pipe).
[0051] Specifically, the water pump further includes a drainage hole 8; the drainage hole 8 is connected to the cavity 7 and the liquid inlet pipe 2 at the bottom of the cavity 7. When the liquid in the cavity 7 needs to be drained, the liquid at the bottom of the cavity 7 can be drained to the liquid inlet pipe 2 through the drainage hole 8. Figure 3 、 Figure 4 、 Figure 6As shown, the cavity 7 is trumpet-shaped. When the liquid in the cavity 7 needs to be drained, the valve connected to the cavity 7 is first opened (the valve is not shown in the figure. As far as this part is concerned, it is a prior art and can be understood by those skilled in the art, so it will not be elaborated in detail), and most of the liquid in the cavity 7 is discharged through the valve; the remaining coolant at the bottom of the cavity 7 cannot be discharged because it is relatively low. However, the present application has a drain hole 8 between the bottom end of the cavity 7 and the liquid inlet pipe 2. The coolant at the bottom of the cavity 7 that cannot be drained can be discharged through the drain hole 8, thereby ensuring that the coolant in the cavity 7 is drained, which is convenient for subsequent replacement of new coolant.
[0052] Specifically, the above-mentioned method of opening the drain hole 8 can drain the coolant in the cavity 7, but during the normal operation of the water pump (the process of not draining the coolant in the cavity 7), due to the high pressure in the cavity 7 and the low pressure in the liquid inlet pipe 2, there will be a certain amount of liquid in the drain hole 8. This part of the liquid has a high pressure difference at both ends. Therefore, when the internal liquid pressure is lower than the saturated vapor pressure of the coolant, the gas inside the coolant will precipitate and form bubbles. The process of bubbles from nothing to explosion will cause damage to the inside of the drain hole or even puncture, thus affecting the service life of the water pump. In order to solve this technical problem, the present application is also provided with a spoiler component. Further, the spoiler component is arranged in the drain hole 8, the cavity 7 has a first pressure, and the liquid inlet pipe 2 has a second pressure less than the first pressure; when the water pump is working, at least part of the liquid in the cavity 7 can be discharged into the liquid inlet pipe 2 through the drain hole 8; the spoiler component can adjust the flow rate of the liquid flowing from the cavity 7 to the liquid inlet pipe 2 to reduce the occurrence of cavitation.
[0053] In summary, the present application provides a drain hole 8 between the bottom end of the cavity 7 and the liquid inlet pipe 2. The coolant that cannot be discharged at the bottom of the cavity 7 can be discharged through the drain hole 8, thereby ensuring that the coolant in the cavity 7 is emptied, making it convenient for subsequent replacement of new coolant.
[0054] In addition, the present application provides a spoiler component in the drainage hole 8, which can adjust the flow rate of the liquid flowing from the cavity 7 to the liquid inlet pipe 2. Because it can adjust the pressure difference at both ends of the liquid in the drainage hole 8 to a certain extent, the pressure difference will not be too high, and thus it can reduce the generation of bubbles to a certain extent, reduce the impact of bubbles on the inner wall of the drainage hole 8, and thus ensure the service life of the water pump.
[0055] In this embodiment, combined Figure 6 and Figure 7 As shown, the spoiler assembly includes a pin body 10. The pin body 10 is disposed in the liquid discharge hole 8, and a liquid through hole 11 coaxial with the liquid discharge hole 8 is formed in the pin body 10.
[0056] Specifically, the diameter of the liquid through hole 11 is a variable diameter structure along the axial direction of the liquid through hole, so as to change the flow rate of the liquid flowing from the cavity 7 to the liquid inlet pipe 2.
[0057] Furthermore, a thread groove is provided on the inner side wall of the pin body 10, so that the diameter of the liquid hole 11 is a variable diameter structure along the axial direction of the liquid hole. Specifically, since the thread groove has protrusions and depressions, or it can be understood that the thread groove has crests and troughs, when the coolant passes through the thread groove, it will repeatedly pass through the protrusions and depressions. When the coolant passes over the protrusions from the depressions, the protrusions are equivalent to increasing the flow resistance of the coolant. Therefore, to a certain extent, the flow rate of the liquid flowing from the cavity 7 to the liquid inlet pipe 2 will be reduced, so that the coolant will not directly rush from the high-pressure area (cavity 7) to the low-pressure area (liquid inlet pipe 2). Because the pressure difference between the two ends of the liquid in the drainage hole 8 can be adjusted to a certain extent, the pressure difference will not be too high, and the generation of bubbles can be reduced to a certain extent, reducing the impact of bubbles on the inner wall of the drainage hole 8, thereby ensuring the service life of the water pump.
[0058] In this embodiment, combined Figure 7 As shown, the end face of the pin body 10 along its axial direction is provided with a chamfer 9. Compared with the pin body 10 without the chamfer 9, the setting of the chamfer 9 makes it easier to insert the pin body 10 into the drainage hole 8, and there will be no problem of jamming between the end face of the pin body 10 along its axial direction and the side wall of the drainage hole 8.
[0059] Example 2
[0060] In this embodiment, combined Figure 8 As shown, a spoiler assembly different from that in the first embodiment is provided. Specifically, the spoiler assembly includes a pin body 10. At least a portion of the inner sidewall of the liquid through hole is wavy along the axis of the pin body 10. The wavy inner sidewall of the liquid through hole 4 is capable of causing the diameter of the liquid through hole 11 to be a variable diameter structure along the axis of the liquid through hole.
[0061] Further, combined with Figure 8 As shown, the top inner sidewall of the pin body 10 and the bottom inner sidewall of the pin body 10 are wavy along the axial direction of the pin body 10. Specifically, when the coolant passes through the pin body 10, part of the coolant will repeatedly pass through the protrusions and depressions. When the coolant passes over the protrusions from the depressions, the protrusions are equivalent to increasing the flow resistance of the coolant. Therefore, to a certain extent, the flow rate of the liquid flowing from the cavity 7 to the liquid inlet pipe 2 will be reduced, so that the coolant will not directly rush from the high-pressure area (cavity 7) to the low-pressure area (liquid inlet pipe 2). Because the pressure difference between the two ends of the liquid in the drainage hole 8 can be adjusted to a certain extent, the pressure difference will not be too high, which can reduce the generation of bubbles to a certain extent and reduce the impact of bubbles on the inner wall of the drainage hole 8, thereby ensuring the service life of the water pump.
[0062] Example 3
[0063] In this embodiment, combined Figure 9 As shown, a spoiler assembly different from that in the first and second embodiments is provided. Specifically, the spoiler assembly further includes a spring 12. The spring 12 is disposed in the liquid passage hole and the extension direction of the spring 12 is coaxial with the axial direction of the liquid passage hole 11. The spring 12 can make the diameter of the liquid passage hole 11 a variable diameter structure along the axial direction of the liquid passage hole.
[0064] Combine Figure 9 As shown, specifically, the setting of the spring 12 will also make the liquid hole have protrusions and depressions, or it can be understood that the thread groove has peaks and troughs. When the coolant passes through the spring 12, it will repeatedly pass through the protrusions and depressions. When the coolant passes over the protrusions from the depressions, the protrusions are equivalent to increasing the flow resistance of the coolant. Therefore, to a certain extent, the flow rate of the liquid flowing from the cavity 7 to the liquid inlet pipe 2 will be reduced, so that the coolant will not rush directly from the high-pressure area (cavity 7) to the low-pressure area (liquid inlet pipe 2). Because the pressure difference at both ends of the liquid in the drainage hole 8 can be adjusted to a certain extent, the pressure difference will not be too high, and the generation of bubbles can be reduced to a certain extent, reducing the impact of bubbles on the inner wall of the drainage hole 8, thereby ensuring the service life of the water pump.
[0065] In this embodiment, the pin body 10 is welded to the drainage hole 8, and the spring 12 is welded to the liquid passage hole 11. This welding method not only improves the connection stability between the pin body 10 and the drainage hole 8, and between the spring 12 and the pin body 10, but also makes the welding process simple and easy to operate.
[0066] Example 4
[0067] In this embodiment, the pin body 10 is made of spring steel or stainless steel.
[0068] Specifically, the spring 12 steel has a high elastic limit and fatigue limit, sufficient plasticity and toughness. Therefore, even if a small amount of bubbles are generated, when the bubbles burst and impact the drain hole 8, it will not cause serious damage to the drain hole 8. Therefore, it can improve the service life of the water pump to a certain extent.
[0069] Specifically, stainless steel, whose full name is stainless acid-resistant steel, refers to a series of steel types that have high chemical stability in air, water, salt aqueous solutions, acids and other corrosive media; it has corrosion resistance, heat resistance and other characteristics; therefore, even if a small amount of bubbles are generated, when the bubbles burst and impact the drain hole 8, it will not cause more serious damage to the drain hole 8, so it can improve the service life of the water pump to a certain extent.
[0070] Example 5
[0071] In this embodiment, the pin body 10 is made of carbon steel or alloy steel.
[0072] Specifically, carbon steel is an iron-carbon alloy with a carbon content of 0.0218% to 2.11%, also known as carbon steel. It has a certain strength, so even if a small amount of bubbles are generated, when the bubbles burst and impact the drain hole 8, they will not cause serious damage to the drain hole 8, thereby extending the service life of the water pump to a certain extent.
[0073] Specifically, alloy steel has a certain strength, so even if a small amount of bubbles are generated, when the bubbles burst and impact the drainage hole 8, no serious damage will be caused to the drainage hole 8, thus improving the service life of the water pump to a certain extent.
[0074] Example 6
[0075] The present application also provides a car, comprising the above-mentioned water pump, and thus having all the beneficial effects of the above-mentioned water pump, which will not be elaborated in detail here.
[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A water pump comprising a housing, a liquid inlet pipe, an impeller, and at least one liquid outlet pipe; a cavity is formed in the housing, and the impeller is disposed in the cavity; the liquid inlet pipe and the liquid outlet pipe are both connected to the cavity, and the liquid inlet pipe and the liquid outlet pipe extend in opposite directions; liquid introduced by the liquid inlet pipe can be discharged from the liquid outlet pipe through the impeller; characterized in that The water pump further includes a drainage hole and a spoiler component; The drainage hole at the bottom of the cavity connects the cavity with the liquid inlet pipe. When the liquid in the cavity needs to be drained, the liquid at the bottom of the cavity can be drained into the liquid inlet pipe through the drainage hole. The cavity has a first pressure, and the liquid inlet pipe has a second pressure which is lower than the first pressure; when the water pump is working, at least part of the liquid in the cavity can be discharged into the liquid inlet pipe through the drainage hole; the spoiler component is arranged in the drainage hole, and the spoiler component can adjust the flow rate of the liquid flowing from the cavity to the liquid inlet pipe to reduce the occurrence of cavitation.
2. The water pump according to claim 1, characterized in that The spoiler assembly includes a pin body; The pin body is arranged in the drainage hole, and a liquid through hole coaxial with the drainage hole is formed in the pin body; The diameter of the liquid through hole is a variable diameter structure along the axial direction of the liquid through hole, so as to change the flow rate of the liquid flowing from the cavity to the liquid inlet pipe.
3. The water pump according to claim 2, characterized in that The inner side wall of the pin body is provided with a thread groove, so that the diameter of the liquid through hole is a variable diameter structure along the axial direction of the liquid through hole.
4. The water pump according to claim 2, characterized in that The spoiler assembly includes a pin body; At least a portion of the inner sidewall of the liquid through hole is wavy along the axial direction of the pin body. The wavy inner sidewall of the liquid through hole enables the diameter of the liquid through hole to be a variable diameter structure along the axial direction of the liquid through hole.
5. The water pump according to claim 4, characterized in that The top inner side wall of the pin body and the bottom inner side wall of the pin body are wavy along the axis direction of the pin body.
6. The water pump according to claim 2, characterized in that The spoiler assembly further includes a spring; The spring is arranged in the liquid through hole and the extension direction of the spring is coaxial with the axial direction of the liquid through hole. The spring can make the diameter of the liquid through hole a variable diameter structure along the axial direction of the liquid through hole.
7. The water pump according to claim 6, characterized in that The pin body is welded to the liquid discharge hole, and the spring is welded to the liquid through hole.
8. The water pump according to any one of claims 2 to 7, characterized in that: The pin body is made of spring steel or stainless steel.
9. The water pump according to any one of claims 2 to 7, characterized in that: The pin body is made of carbon steel or alloy steel.
10. An automobile, characterized in that: The water pump comprises the water pump according to any one of claims 1 to 9.