Water drain valve, engine oil cooler, engine and vehicle

Abstract

The utility model provides a water drain valve, an engine oil cooler, an engine and a vehicle, the water drain valve comprises a valve body and a valve core, and the valve core is rotatably arranged on the valve body around the center line of the valve core; the handle, the elastic piece and the limiting piece are sequentially arranged on the valve element in a sleeving mode in the direction away from the valve body, the handle is arranged in a sliding mode along the center line of the valve element, and the limiting piece is fixedly connected with the valve element; wherein a stop protrusion is arranged on the valve body, a limiting groove used for being connected with or separated from the stop protrusion in an inserted mode is formed in the handle, the valve element is locked through insertion connection of the limiting groove and the stop protrusion, and the limiting groove and the stop protrusion are separated by pressing the handle in the direction away from the valve body so that the valve element can be released. The problem that in the prior art, a water drain valve of an engine oil cooler is prone to being opened by mistake under interference of outside sundries and the like is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, and particularly to a drain valve, an oil cooler, an engine and a vehicle. Background Art

[0002] The operating environment of a paddy field tractor is harsher than that of a land tractor. During actual operation, the paddy field usually submerges some components of the engine of the paddy field tractor, such as the drain valve of the oil cooler. The land in the paddy field is muddy and has a lot of debris, which is likely to scrape open the drain valve. When the drain valve is scraped open, the coolant will leak, resulting in the phenomenon of high-temperature cylinder pulling of the engine due to lack of coolant.

[0003] Drain valve: A structure that opens the handle during operation to discharge liquid and can be closed after discharging.

[0004] Oil cooler: A structure in which coolant and oil flow internally and whose function is to cool the oil. Summary of the Utility Model

[0005] The main purpose of the utility model is to provide a drain valve, an oil cooler, an engine and a vehicle, so as to solve the problem that the drain valve of the existing oil cooler is easily misopened under the interference of external debris and the like.

[0006] To achieve the above purpose, according to the first aspect of the utility model, a drain valve is provided, including: a valve body and a valve core. The valve core is rotatably arranged in the valve body around its own central axis; a handle, an elastic member and a limiting member are sequentially sleeved on the valve core along the direction away from the valve body. The handle is slidably arranged along the central axis of the valve core, and the limiting member is fixedly connected to the valve core; wherein, a stop protrusion is arranged on the valve body, and a limiting groove for inserting or separating from the stop protrusion is arranged on the handle. The valve core is locked by the insertion of the limiting groove and the stop protrusion, and the limiting groove and the stop protrusion are separated by pressing the handle along the direction away from the valve body to release the valve core.

[0007] Further, the handle includes a handle main body, a first limiting protrusion and a second limiting protrusion which are all connected to the handle main body. An installation hole is arranged on the handle main body to sleeved on the valve core through the installation hole. The first limiting protrusion and the second limiting protrusion are both located on the side of the handle main body close to the valve body and are arranged at intervals around the central axis of the installation hole to form a limiting groove.

[0008] Furthermore, the length S1 of the first limiting protrusion is greater than the length S2 of the second limiting protrusion, and the second limiting protrusion and the first limiting protrusion are arranged in sequence along the rotation direction M of the valve core during the gradual opening process; a guiding inclined surface is provided on the second limiting protrusion, and the guiding inclined surface is located on the side of the second limiting protrusion away from the first limiting protrusion; wherein, when the valve core is in the fully open position, the handle moves in a direction away from the valve body under the blocking action of the blocking protrusion on the guiding inclined surface by rotating the valve core, so as to rotate the valve core to the fully closed position.

[0009] Furthermore, the included angle A between the guiding inclined surface and the end surface of the valve body near the limiting member is such that the value range of A is 30 degrees ≤ A ≤ 40 degrees; and / or first rounded corners R1 and second rounded corners R2 are respectively machined at two first edges formed by the guiding inclined surface and arranged in sequence along the rotation direction M of the valve core during the gradual opening process; and / or one end of the blocking protrusion close to the handle body includes two second edges arranged in sequence along the rotation direction M of the valve core during the gradual opening process, a third rounded corner R3 is machined at one of the two second edges close to the first limiting protrusion, and one of the two second edges away from the first limiting protrusion is a right angle.

[0010] Furthermore, the handle includes a third limiting protrusion, the third limiting protrusion is located on the side of the handle body close to the valve body, the third limiting protrusion is located on the side of the second limiting protrusion away from the first limiting protrusion and is spaced from the second limiting protrusion, so as to indicate whether the valve core is in the fully open position by whether the third limiting protrusion contacts the blocking protrusion.

[0011] Furthermore, a rotation limiting block is provided on one of the valve core and the handle, a rotation limiting groove is provided on the other of the valve core and the handle, and the rotation limiting block is inserted and matched with the rotation limiting groove to limit the relative rotation between the valve core and the handle; and / or the water discharge valve further includes a gasket, and the gasket is clamped between the elastic member and the limiting member; and / or the limiting member includes a nut, and an external thread portion for threaded connection with the internal thread hole of the nut is provided on the valve core; and / or the width B1 of the limiting groove is greater than the width B2 of the blocking protrusion; and / or the elastic member includes a compression spring.

[0012] Furthermore, the valve core includes a valve stem and a valve ball connected to each other. The first end of the valve stem and the valve ball are located inside the valve body, and the second end of the valve stem is located outside the valve body. The handle, the elastic member and the limiting member are all installed on the valve stem; the valve body includes a rod body cavity, a sphere cavity and a pipeline cavity. The rod body cavity is located on the first side of the sphere cavity and communicates with the sphere cavity. The pipeline cavity is located on the second side of the sphere cavity and communicates with the sphere cavity. The first end of the valve stem is located inside the rod body cavity, and the valve ball is located inside the sphere cavity.

[0013] According to a second aspect of the present utility model, an engine oil cooler is provided, which includes a cooler main body and the above-mentioned drain valve, and the drain valve is installed at the water outlet of the cooler main body.

[0014] According to a third aspect of the present utility model, an engine is provided, which includes an engine main body and the above-mentioned engine oil cooler, and the engine oil cooler is installed on the engine main body.

[0015] According to a fourth aspect of the present utility model, a vehicle is provided, which includes a vehicle body and the above-mentioned engine, and the engine is installed on the vehicle body.

[0016] Applying the technical solution of the present utility model, the drain valve of the present utility model includes: a valve body and a valve core, and the valve core is rotatably arranged in the valve body around its own central axis; a handle, an elastic member and a limiting member are sequentially sleeved on the valve core along the direction away from the valve body, the handle is slidably arranged along the central axis of the valve core, and the limiting member is fixedly connected to the valve core; wherein, a stop protrusion is arranged on the valve body, and a limiting groove for inserting or separating from the stop protrusion is arranged on the handle. The valve core is locked by the insertion of the limiting groove and the stop protrusion, and the limiting groove is separated from the stop protrusion by pressing the handle along the direction away from the valve body to release the valve core. In this way, when the drain valve of the present utility model is installed at the outlet of the engine oil cooler of a vehicle (such as a paddy field tractor), by setting the handle, the elastic member and the limiting member, the valve core is locked when the valve core is closed, preventing the occurrence of coolant leakage caused by improper operation or accidental situations (such as mud and grass in the paddy field scraping open the drain valve), avoiding engine cylinder pulling, protecting the engine from damage, greatly improving the working efficiency and reliability of the engine, solving the problem that the drain valve of the engine oil cooler in the prior art is prone to be accidentally opened under the interference of external sundries, and reducing the maintenance cost of the engine. Description of the Drawings

[0017] The specification drawings forming a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0018] Figure 1 It shows a schematic structural diagram of an embodiment of the drain valve according to the present utility model in the first direction;

[0019] Figure 2 It shows Figure 1 A schematic structural diagram of the shown drain valve in the second direction;

[0020] Figure 3 It shows Figure 1 A side view of the shown drain valve;

[0021] Figure 4 shows Figure 1 a cross-sectional view of the shown drain valve when the valve core is in the fully closed position;

[0022] Figure 5 shows Figure 1 a cross-sectional view of the shown drain valve when the valve core is in the fully open position;

[0023] Figure 6 shows Figure 3 a partially enlarged view of the shown drain valve;

[0024] Figure 7 shows the front view of an embodiment of an engine according to the present invention.

[0025] Among them, the above-mentioned drawings include the following reference numerals:

[0026] 1, valve body; 11, stop projection; 12, rod cavity; 13, sphere cavity; 14, pipe cavity;

[0027] 2, valve core; 21, valve stem; 22, valve ball; 23, rotation limit block;

[0028] 3, handle; 31, limit groove; 32, handle body; 33, first limit projection; 34, second limit projection; 35, guiding inclined surface; 36, third limit projection;

[0029] 4, elastic member; 5, limiting member; 6, gasket; 7, connecting pipe; 8, gland; 9, sealing ring; 10, sealing plug;

[0030] 100, drain valve; 200, oil cooler; 300, engine. Detailed implementation manners

[0031] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0032] As Figures 1 to 7 shown, the present invention provides a drain valve 100, including: a valve body 1 and a valve core 2, the valve core 2 is rotatably arranged in the valve body 1 around its own central axis; a handle 3, an elastic member 4 and a limiting member 5 are sleeved on the valve core 2 in sequence along the direction away from the valve body 1, the handle 3 is slidably arranged along the central axis of the valve core 2, and the limiting member 5 is fixedly connected with the valve core 2; wherein, a stop projection 11 is arranged on the valve body 1, and a limit groove 31 for inserting or separating from the stop projection 11 is arranged on the handle 3, the valve core 2 is locked by inserting the limit groove 31 into the stop projection 11, and the limit groove 31 is separated from the stop projection 11 by pressing the handle 3 along the direction away from the valve body 1 to release the valve core 2.

[0033] In this way, when the water discharge valve 100 of the present utility model is installed at the outlet of the oil cooler 200 of the engine 300 of a vehicle (such as a paddy field tractor), by setting the handle 3, the elastic member 4 and the limiting member 5, the locking of the valve core 2 is achieved when the valve core 2 is closed, preventing the occurrence of coolant leakage caused by improper operation or accidental situations (such as mud and grass in the paddy field scraping open the water discharge valve 100, etc.), avoiding engine cylinder pulling, protecting the engine from damage, greatly improving the working efficiency and reliability of the engine, solving the problem that the water discharge valve of the existing oil cooler is prone to being accidentally opened under the interference of external sundries, etc., and reducing the maintenance cost of the engine.

[0034] Specifically, the synergistic effect of the elastic member 4 and the limiting member 5 can press the handle 3 against the valve body 1 to lock the valve core 2, and can also provide a stable elastic acting force for the handle 3 when closing the valve core 2, ensuring the accurate reset of the valve core 2 and preventing the valve core 2 from getting stuck due to uneven operating force.

[0035] As Figures 1 to 3 shown, the handle 3 includes a handle main body 32 connected to each other, and a first limiting protrusion 33 and a second limiting protrusion 34 both connected to the handle main body 32. An installation hole is provided on the handle main body 32 to sleeved on the valve core 2 through the installation hole. The first limiting protrusion 33 and the second limiting protrusion 34 are both located on the side of the handle main body 32 close to the valve body 1 and are arranged at intervals around the center line of the installation hole to form a limiting groove 31.

[0036] As Figures 1 to 3 and Figure 6 shown, the length S1 of the first limiting protrusion 33 is greater than the length S2 of the second limiting protrusion 34. The second limiting protrusion 34 and the first limiting protrusion 33 are arranged in sequence along the rotation direction M of the valve core 2 during the gradual opening process; a guiding inclined surface 35 is provided on the second limiting protrusion 34, and the guiding inclined surface 35 is located on the side of the second limiting protrusion 34 away from the first limiting protrusion 33; wherein, when the valve core 2 is in the fully open position, by rotating the valve core 2, the handle 3 moves in the direction away from the valve body 1 under the blocking action of the stop protrusion 11 on the guiding inclined surface 35 to rotate the valve core 2 to the fully closed position.

[0037] In this way, the setting of the guiding inclined surface 35 ensures that the operation when closing the valve core 2 is smoother, making the user experience better.

[0038] Specifically, the length S1 of the first limiting protrusion 33 is greater than the length S3 of the elastic member 4 to ensure that the first limiting protrusion 33 will not completely come out of the valve body 1.

[0039] Preferably, S1 = 4.8mm, S1 = 1.3mm, S1 = 4.2mm.

[0040] As shown Figure 6 in the figure, the included angle between the guiding inclined surface 35 and the end surface of one end of the valve body 1 close to the limiting member 5 is A, where the value range of A is 30° ≤ A ≤ 40°; and / or at two first edges formed by the guiding inclined surface 35 and arranged in sequence along the rotation direction M of the valve core 2 during the gradual opening process, first rounded corners R1 and second rounded corners R2 are respectively machined; and / or one end of the stop projection 11 close to the handle body 32 includes two second edges arranged in sequence along the rotation direction M of the valve core 2 during the gradual opening process, and a third rounded corner R3 is machined at one of the two second edges close to the first limiting projection 33, and the other of the two second edges far from the first limiting projection 33 is a right angle.

[0041] Specifically, in the present utility model, the included angle A between the guiding inclined surface 35 and the end surface of one end of the valve body 1 close to the limiting member 5 is set to 35°, so that the automatic locking of the valve core 2 is realized, making the operation of the water discharge valve more efficient, user-friendly and efficient.

[0042] By arranging the first rounded corner R1, the second rounded corner R2 and the third rounded corner R3 to cooperate with the guiding inclined surface 35, the present utility model can guide the handle 3 to move smoothly along the direction away from the valve body 1 during the rotation process, avoiding jamming and resistance during the operation process, and improving the smoothness and safety of the operation.

[0043] In practical applications, especially in emergency situations, this kind of water discharge valve ensures that the operator can quickly and accurately close the valve core 2, improving the convenience and safety of the operation, which is crucial for ensuring the normal operation of the cooling system and maintaining the safety of the engine.

[0044] In the first embodiment of the present utility model, A is 30°.

[0045] In the second embodiment of the present utility model, A is 35°.

[0046] In the third embodiment of the present utility model, A is 40°.

[0047] As shown Figures 1 to 3 in the figure, the handle 3 includes a third limiting projection 36, the third limiting projection 36 is located on the side of the handle body 32 close to the valve body 1, the third limiting projection 36 is located on the side of the second limiting projection 34 far from the first limiting projection 33 and is arranged at an interval from the second limiting projection 34, so as to indicate whether the valve core 2 is in the fully open position by whether the third limiting projection 36 contacts the stop projection 11.

[0048] In this way, the setting of the third limiting protrusion 36 ensures that the water discharge valve 100 can be fully opened to the maximum discharge area. The operator can quickly determine whether the water discharge valve 100 is in the fully opened state through the contact state between the third limiting protrusion 36 and the stop protrusion 11, avoiding problems such as insufficient or excessive water discharge caused by misoperation.

[0049] As Figure 3 shown, a rotation limiting block 23 is provided on one of the valve core 2 and the handle 3, and a rotation limiting groove is provided on the other of the valve core 2 and the handle 3. The rotation limiting block 23 is inserted and matched with the rotation limiting groove to limit the relative rotation between the valve core 2 and the handle 3; and / or the water discharge valve 100 further includes a gasket 6, and the gasket 6 is clamped between the elastic member 4 and the limiting member 5; and / or the limiting member 5 includes a nut, and an external thread portion for threaded connection with the internal thread hole of the nut is provided on the valve core 2; and / or the width B1 of the limiting groove 31 is greater than the width B2 of the stop protrusion 11; and / or the elastic member 4 includes a compression spring.

[0050] The insertion and matching of the rotation limiting block 23 and the rotation limiting groove between the valve core 2 and the handle 3 of the present utility model not only guides the sliding of the handle 3 along the center line of the valve core 2, but also ensures the synchronous rotation between the valve core 2 and the handle 3, avoiding the situation of the handle 3 idling, reducing operation errors, and improving the accuracy and safety of operation.

[0051] By providing the gasket 6 between the elastic member 4 and the limiting member 5 in the present utility model, the limiting member 5 and the elastic member 4 can be protected, reducing the wear on them caused by long-term operation or frequent operation, and extending the service life of the water discharge valve.

[0052] As Figure 4 and Figure 5 shown, the valve core 2 includes a valve stem 21 and a valve ball 22 connected to each other. The first end of the valve stem 21 and the valve ball 22 are located inside the valve body 1, and the second end of the valve stem 21 is located outside the valve body 1. The handle 3, the elastic member 4 and the limiting member 5 are all installed on the valve stem 21; the valve body 1 includes a rod body cavity 12, a sphere cavity 13 and a pipeline cavity 14. The rod body cavity 12 is located on the first side of the sphere cavity 13 and communicates with the sphere cavity 13. The pipeline cavity 14 is located on the second side of the sphere cavity 13 and communicates with the sphere cavity 13. The first end of the valve stem 21 is located inside the rod body cavity 12, the valve ball 22 is located inside the sphere cavity 13, and a communication channel is provided on the valve ball 22.

[0053] As Figure 4 and Figure 5As shown in the figure, the water drain valve 100 includes: a connecting pipe 7, the connecting pipe 7 is connected to the valve body 1, and the inner hole of the connecting pipe 7 communicates with the third side of the spherical cavity 13; a gland 8, the gland 8 is sleeved outside the valve stem 21, one end of the gland 8 is inserted into the rod cavity 12, and the other end of the gland 8 is located outside the rod cavity 12 for contacting the handle body 32; a sealing ring 9, the sealing ring 9 is clamped between the valve stem 21 and the rod cavity 12; a sealing plug 10, the sealing plug 10 is clamped between the valve ball 22 and the spherical cavity 13, and both ends of the sealing plug 10 communicate with the pipe cavity 14 and the inner hole of the connecting pipe 7 respectively.

[0054] As Figure 7 shown in the figure, the present utility model provides an oil cooler 200, which includes a cooler main body and the above-mentioned water drain valve 100, and the water drain valve 100 is installed at the water outlet of the cooler main body.

[0055] As Figure 7 shown in the figure, the present utility model provides an engine 300, which includes an engine main body and the above-mentioned oil cooler 200, and the oil cooler 200 is installed on the engine main body.

[0056] The present utility model also provides a vehicle, which includes a vehicle body and the above-mentioned engine, and the engine is installed on the vehicle body.

[0057] Specifically, the vehicle includes a paddy field tractor.

[0058] The switching process of the water drain valve 100 of the present utility model is as follows:

[0059] (1) When opening, the finger holds the handle body 32 of the handle 3, compresses the elastic member 4 downward. When the second limit protrusion 34 disengages from the stop protrusion 11, rotate the handle body 32 along the M direction, and the water drain valve 100 starts to open. When rotating until the third limit protrusion 36 contacts the stop protrusion 11, the through hole on the valve ball 22 is completely communicated with both the pipe cavity 14 of the valve body 1 and the inner hole of the connecting pipe 7, and the water drain valve 100 is completely opened to avoid a small flow area due to excessive rotation.

[0060] (2) When closing, rotate the handle body 32 in the direction opposite to the M direction, and the guiding inclined surface 35 guides the handle 3 to slide over the stop protrusion 11, and the first limit protrusion 33 contacts the stop protrusion 11 so that the limit groove 31 is inserted into the stop protrusion 11.

[0061] From the above description, it can be seen that the above embodiments of the present utility model achieve the following technical effects:

[0062] The drain valve 100 of the present utility model includes: a valve body 1 and a valve core 2, the valve core 2 is rotatably arranged in the valve body 1 around its own central axis; a handle 3, an elastic member 4 and a limiting member 5 are sequentially sleeved on the valve core 2 along the direction away from the valve body 1, the handle 3 is slidably arranged along the central axis of the valve core 2, and the limiting member 5 is fixedly connected to the valve core 2; wherein, a stop protrusion 11 is arranged on the valve body 1, and a limiting groove 31 for inserting or separating from the stop protrusion 11 is arranged on the handle 3. The valve core 2 is locked by inserting the limiting groove 31 into the stop protrusion 11, and the limiting groove 31 is separated from the stop protrusion 11 by pressing the handle 3 along the direction away from the valve body 1 to release the valve core 2. In this way, when the drain valve 100 of the present utility model is installed at the outlet of the oil cooler 200 of the engine 300 of a vehicle (such as a paddy field tractor), by setting the handle 3, the elastic member 4 and the limiting member 5, the valve core 2 is locked when the valve core 2 is closed, preventing the occurrence of coolant leakage caused by improper operation or accidental situations (such as the drain valve 100 being scratched by mud and grass in the paddy field), avoiding the engine from being scuffed, protecting the engine from damage, greatly improving the working efficiency and reliability of the engine, solving the problem that the drain valve of the existing oil cooler is prone to being accidentally opened under the interference of external sundries, and reducing the maintenance cost of the engine.

[0063] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0064] Unless otherwise specifically stated, the relative arrangements of the components and steps, numerical expressions and values set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationship. Technologies, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods and devices should be regarded as part of the authorization specification. In all the examples shown and discussed herein, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0065] In the description of the present application, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom", etc. is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description. Without contrary description, these orientation words 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. Therefore, it should not be construed as a limitation on the protection scope of the present application; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0066] For convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "upper" etc. can be used here to describe the spatial positional relationship between a device or feature shown in the drawings and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the drawings for the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0067] In addition, it should be noted that using words such as "first", "second", etc. to limit components is only for the convenience of distinguishing the corresponding components. Without additional statement, the above words have no special meaning. Therefore, it should not be construed as a limitation on the protection scope of the present application.

[0068] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A drain valve, characterized in that: include: A valve body (1) and a valve core (2), wherein the valve core (2) is rotatably arranged on the valve body (1) around its own center line; A handle (3), an elastic member (4) and a stopper (5) are sequentially sleeved on the valve core (2) in a direction away from the valve body (1); the handle (3) is slidably arranged along the center line of the valve core (2); and the stopper (5) is fixedly connected to the valve core (2); The valve body (1) is provided with a stop protrusion (11), and the handle (3) is provided with a limiting groove (31) for being plugged into or separated from the stop protrusion (11); the valve core (2) is locked by plugging the limiting groove (31) into the stop protrusion (11), and the limiting groove (31) is separated from the stop protrusion (11) by pressing the handle (3) in a direction away from the valve body (1) to release the valve core (2).

2. The drain valve according to claim 1, characterized in that: The handle (3) comprises a connected handle body (32) and a first limiting protrusion (33) and a second limiting protrusion (34) both connected to the handle body (32); a mounting hole is provided on the handle body (32) so as to be sleeved on the valve core (2) through the mounting hole; the first limiting protrusion (33) and the second limiting protrusion (34) are both located on a side of the handle body (32) close to the valve body (1) and are spaced around the center line of the mounting hole to form the limiting groove (31).

3. The drain valve according to claim 2, characterized in that: The length S1 of the first limiting protrusion (33) is greater than the length S2 of the second limiting protrusion (34), and the second limiting protrusion (34) and the first limiting protrusion (33) are arranged in sequence along the rotation direction M of the valve core (2) during the gradual opening process; The second limiting protrusion (34) is provided with a guiding inclined surface (35), and the guiding inclined surface (35) is located on a side of the second limiting protrusion (34) away from the first limiting protrusion (33); When the valve core (2) is in a fully open position, the valve core (2) is rotated to cause the handle (3) to move in a direction away from the valve body (1) under the stopping action of the stop protrusion (11) on the guide slope (35), so as to rotate the valve core (2) to a fully closed position.

4. The drain valve according to claim 3, characterized in that: The included angle between the guiding inclined surface (35) and the end surface of the valve body (1) close to the stopper (5) is A, wherein the value range of A is 30 degrees ≤ A ≤ 40 degrees; and / or The two first corners formed by the guide slope (35) and arranged in sequence along the rotation direction M of the valve core (2) during the gradual opening process are respectively processed with a first rounded corner R1 and a second rounded corner R2; and / or The stop protrusion (11) is close to the handle body (32) and includes two second corners arranged in sequence along the rotation direction M of the valve core (2) during the gradual opening process. One of the two second corners is close to the first limiting protrusion (33) and is processed with a third chamfered corner R3, and the one of the two second corners away from the first limiting protrusion (33) is a right angle.

5. The drain valve according to claim 2, characterized in that: The handle (3) comprises a third limiting protrusion (36), wherein the third limiting protrusion (36) is located on a side of the handle body (32) close to the valve body (1), and the third limiting protrusion (36) is located on a side of the second limiting protrusion (34) away from the first limiting protrusion (33) and is spaced apart from the second limiting protrusion (34), so as to indicate whether the valve core (2) is in a fully open position by whether the third limiting protrusion (36) is in contact with the stop protrusion (11).

6. The drain valve according to claim 1, characterized in that: A rotation limit block (23) is provided on one of the valve core (2) and the handle (3), and a rotation limit groove is provided on the other of the valve core (2) and the handle (3), and the rotation limit block (23) is plugged into and matched with the rotation limit groove to limit the relative rotation between the valve core (2) and the handle (3); and / or The drain valve further comprises a gasket (6), wherein the gasket (6) is sandwiched between the elastic member (4) and the limiting member (5); and / or The stopper (5) comprises a nut, and the valve core (2) is provided with an external threaded portion for threaded connection with the internal threaded hole of the nut; and / or The width B1 of the limiting groove (31) is greater than the width B2 of the stopping protrusion (11); and / or The elastic member (4) comprises a compression spring.

7. The drain valve according to any one of claims 1 to 6, characterized in that: The valve core (2) comprises a valve stem (21) and a valve ball (22) connected to each other, the first end of the valve stem (21) and the valve ball (22) are located inside the valve body (1), the second end of the valve stem (21) is located outside the valve body (1), and the handle (3), the elastic member (4) and the limit member (5) are all mounted on the valve stem (21); The valve body (1) comprises a rod body cavity (12), a ball cavity (13) and a pipeline cavity (14); the rod body cavity (12) is located on a first side of the ball cavity (13) and is in communication with the ball cavity (13); the pipeline cavity (14) is located on a second side of the ball cavity (13) and is in communication with the ball cavity (13); the first end of the valve stem (21) is located in the rod body cavity (12); and the valve ball (22) is located in the ball cavity (13).

8. An oil cooler, characterized in that: The invention comprises a cooler body and a drain valve according to any one of claims 1 to 7, wherein the drain valve is installed at a water outlet of the cooler body.

9. An engine, characterized in that: The invention comprises an engine body and the oil cooler according to claim 8, wherein the oil cooler is mounted on the engine body.

10. A vehicle, characterized in that: The vehicle comprises a vehicle body and the engine according to claim 9, wherein the engine is mounted on the vehicle body.

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