Piston oscillation cooling device

Abstract

The utility model discloses a piston oscillation cooling device. The piston oscillation cooling device comprises a piston head and a piston skirt. An outer cooling cavity is defined by the piston head and the piston skirt, the outer cooling cavity extends in the direction close to the edge of the piston skirt, and the outer cooling cavity extends in the direction close to the edge of the piston head. The piston skirt is provided with a backflow cavity, and the outer cooling cavity communicates with the backflow cavity through a leakage channel. A cooling medium enters the outer cooling cavity, the heat exchange coefficient of the outer cooling cavity can be increased by decreasing the filling rate of the outer cooling cavity, and the cooling effect is improved; due to the fact that the outer cooling cavity extends towards the edge direction of the piston skirt and extends towards the edge direction of the piston head, the volume of the outer cooling cavity is increased, and the filling rate of the cooling cavity is preliminarily reduced; as the cooling medium can flow out of the outer cooling cavity along the leakage channel, the mass of the cooling medium in the outer cooling cavity is reduced, and the filling rate of the cooling cavity is further reduced.

Description

Technical Field

[0001] This application relates to the technical field of internal combustion engines, and particularly to a piston oscillating cooling device. Background Art

[0002] During the high-speed movement of the piston, a large amount of heat is generated. Currently, the oscillating cooling method is often used to reduce the temperature of the piston. An outer cooling space near the piston edge and an inner cooling space in the middle of the piston are provided in the piston head. The cooling medium enters the inner and outer cooling spaces and flows through at a certain circulation speed. Due to the high-frequency reciprocating movement of the piston, the cooling medium oscillates up and down in the inner and outer cooling spaces under the action of inertia force, thereby cooling the piston.

[0003] However, during the flow of the cooling medium, there is often a situation where the amount of the medium in the outer cooling space is too large, resulting in a small space for the medium to oscillate in the outer cooling space, leading to a low heat transfer coefficient in the outer cooling space. At the same time, there is also a situation where the amount of the medium in the inner cooling space is too small, resulting in a poor oscillation effect on the wall surface of the inner cooling space. Summary of the Utility Model

[0004] To solve at least one of the above technical problems, this application provides a piston oscillating cooling device, and the technical solutions adopted are as follows:

[0005] This application provides a piston oscillating cooling device, which includes a piston head and a piston skirt; the end of the piston head is butted against the end of the piston skirt, and the piston head and the piston skirt enclose an outer cooling chamber, and the outer cooling chamber extends towards the edge close to the piston skirt and extends towards the edge close to the piston head; wherein, a return chamber is provided on the piston skirt, and the outer cooling chamber is communicated with the return chamber through a discharge channel, and the discharge channel is used to make the cooling medium in the outer cooling chamber flow into the return chamber to reduce the filling rate in the outer cooling chamber.

[0006] In some embodiments of this application, a first outer oscillation groove is provided at the end of the piston head, and a second outer oscillation groove is provided at the end of the piston skirt, and the first outer oscillation groove and the second outer oscillation groove enclose the outer cooling chamber.

[0007] In some embodiments of this application, the first outer oscillation groove includes a first opening part and a first bending part that are communicated with each other, the first bending part forms an angle with the first opening part, and the first bending part extends towards the edge close to the piston head to increase the volume of the outer cooling chamber;

[0008] The second outer oscillation groove includes a second opening portion and a second bent portion that communicate with each other. The second bent portion forms an angle with the second opening portion, and the second bent portion extends in a direction close to the edge of the piston skirt to increase the volume of the outer cooling chamber.

[0009] In some embodiments of the present application, the piston head and the piston skirt enclose an inner cooling chamber. The outer cooling chamber surrounds the outside of the inner cooling chamber, and the inner cooling chamber communicates with the outer cooling chamber.

[0010] In some embodiments of the present application, a first inner oscillation groove is provided at the end of the piston head, and a second inner oscillation groove is provided at the end of the piston skirt. The first inner oscillation groove and the second inner oscillation groove enclose the inner cooling chamber.

[0011] In some embodiments of the present application, the piston skirt is provided with a connection channel, and the piston head is provided with a balance channel. The inner cooling chamber and the outer cooling chamber communicate through the connection channel and the balance channel. The connection channel is used to allow the cooling medium in the outer cooling chamber to flow into the inner cooling chamber. The height of the balance channel is greater than the height of the connection channel. The balance channel is used to allow the gas in the inner cooling chamber and the outer cooling chamber to flow through.

[0012] In some embodiments of the present application, the height of the end of the balance channel communicating with the outer cooling chamber is greater than the height of the end of the balance channel communicating with the inner cooling chamber.

[0013] In some embodiments of the present application, the inner cooling chamber communicates with the return chamber through a return channel. The return channel is used to allow the cooling medium in the inner cooling chamber to flow into the return chamber.

[0014] In some embodiments of the present application, the side wall of the return channel extends into the inner cooling chamber to increase the filling rate of the cooling medium in the inner cooling chamber.

[0015] In some embodiments of the present application, the piston oscillation cooling device includes a piston pin. The piston pin is connected to the piston skirt. The outer cooling chamber is provided with an inlet channel extending towards the piston pin. The piston pin is used to deliver the internal cooling medium to the inlet channel.

[0016] Embodiments of the present application have at least the following beneficial effects: In the present application, the cooling medium enters the outer cooling chamber. The filling rate of the cooling medium in the outer cooling chamber is positively correlated with the inflow rate of the cooling medium and negatively correlated with the volume margin of the outer cooling chamber. Appropriately reducing the filling rate can improve the heat transfer coefficient of the outer cooling chamber and enhance the cooling effect. Since the outer cooling chamber extends towards the edge of the piston skirt and towards the edge of the piston head, the volume of the outer cooling chamber is increased, initially reducing the filling rate of the cooling chamber. Since the cooling medium can flow out of the outer cooling chamber along the discharge channel, the amount of the cooling medium in the outer cooling chamber is reduced, further reducing the filling rate of the cooling chamber.

[0017] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 is a schematic cross-sectional structure diagram of the piston oscillating cooling device of the present application;

[0020] Figure 2 is the piston oscillating cooling device of the present application Figure 1 a partial enlarged view of part I therein;

[0021] Figure 3 is the piston oscillating cooling device of the present application Figure 1 a partial enlarged view of part II therein.

[0022] REFERENCE SIGNS:

[0023] Piston head 101; First outer oscillation groove 102; First inner oscillation groove 103; Balance channel 104;

[0024] Piston skirt 201; Second outer oscillation groove 202; Second inner oscillation groove 203; Connection channel 204;

[0025] Outer cooling chamber 301; Inner cooling chamber 302; Return chamber 303; Discharge channel 304; Return channel 305;

[0026] Piston pin 401; Inlet channel 402. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] This section will be combined with Figures 1 to 3Embodiments of the present application are described in detail. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and should not be construed as a limitation of the present application.

[0028] In the description of the present application, it should be understood that if terms such as "center", "middle", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the accompanying drawings. This is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present application. Features defined as "first" and "second" are used to distinguish feature names and do not have special meanings. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0029] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0030] As Figure 1 shown, an embodiment of the present application provides a piston oscillating cooling device. The piston oscillating cooling device includes a piston head 101 and a piston skirt 201.

[0031] The piston head 101 and the piston skirt 201 define an outer cooling chamber 301. The outer cooling chamber 301 is used to accommodate a cooling medium. The outer cooling chamber 301 expands its volume through its shape, and the outer cooling chamber 301 can discharge the cooling medium by itself to reduce the amount of the cooling medium in the outer cooling chamber 301. Since the volume of the outer cooling chamber 301 is large and the amount of the cooling medium inside is small, the filling rate of the outer cooling chamber 301 is small, thereby improving the heat transfer coefficient of the outer cooling chamber 301 and enhancing the cooling effect. Specifically, the cooling medium uses cooling oil.

[0032] In some examples, the end of the piston head 101 abuts against the end of the piston skirt 201, and an outer cooling chamber 301 is formed between the end of the piston head 101 and the end of the piston skirt 201. The outer cooling chamber 301 extends from the end of the piston skirt 201 towards the edge of the piston skirt 201, such that the outer cooling chamber 301 has a larger volume at the end of the piston skirt 201; at the same time, the outer cooling chamber 301 extends from the end of the piston head 101 towards the edge of the piston head 101, such that the outer cooling chamber 301 has a larger volume at the end of the piston head 101. Due to the outward extension at both ends of the outer cooling chamber 301, the overall volume of the outer cooling chamber 301 is increased. When the cooling medium enters the outer cooling chamber 301, it is beneficial to reduce the filling rate of the cooling medium in the outer cooling chamber 301.

[0033] It can be understood that when the filling rate of the cooling medium in the outer cooling chamber 301 is small, there is sufficient space in the outer cooling chamber 301 for the cooling medium to oscillate, thereby enhancing the heat transfer coefficient of the outer cooling chamber 301 and improving the cooling effect.

[0034] As Figure 2 shown, in some examples, a first outer oscillation groove 102 is formed at the end of the piston head 101, and a second outer oscillation groove 202 is formed at the end of the piston skirt 201. The end of the piston head 101 having the first outer oscillation groove 102 abuts against the end of the piston skirt 201 having the second outer oscillation groove 202, and the openings of the first outer oscillation groove 102 and the second outer oscillation groove 202 are in butt joint. The first outer oscillation groove 102 and the second outer oscillation groove 202 are in communication with each other and jointly form the outer cooling chamber 301.

[0035] Furthermore, according to the conventional setting method of the piston skirt 201 and the piston head 101, the piston head 101 is butt-jointed to the top of the piston skirt 201, and the height of the first outer oscillation groove 102 is greater than the height of the second outer oscillation groove 202.

[0036] Among them, the cooling medium enters the outer cooling chamber 301 from the second outer oscillation groove 202 and accumulates in the second outer oscillation groove 202 due to its own gravity, and the space for the cooling medium to oscillate is located above the cooling medium, that is, within the range of the first outer oscillation groove 102.

[0037] In some examples, the first outer oscillation groove 102 includes a first opening portion and a first bending portion. The first opening portion is in communication with the first bending portion. The first opening portion is located at the end of the piston head 101 and extends into the piston head 101 for a certain distance, providing a certain volume for the first outer oscillation groove 102.

[0038] Among them, the first bending portion forms an angle with the first opening portion and extends towards the edge of the piston head 101 along an inclined direction, providing a larger volume for the first outer oscillation groove 102.

[0039] Similarly, the second outer oscillation groove 202 includes a second opening portion and a second bending portion. The second opening portion communicates with the second bending portion. The second opening portion is located at the end of the piston skirt 201 and extends into the piston skirt 201 by a certain distance, providing a certain volume for the second outer oscillation groove 202. The second bending portion forms an angle with the second opening portion and extends along an inclined direction towards the edge of the piston skirt 201, providing a larger volume for the second outer oscillation groove 202. Since the first outer oscillation groove 102 includes a first bending portion and the second outer oscillation groove 202 includes a second bending portion, the cross-section of the outer cooling chamber 301 formed by the docking of the first outer oscillation groove 102 and the second outer oscillation groove 202 is generally in a "U" shape.

[0040] Specifically, the shapes of the first outer oscillation groove 102 and the second outer oscillation groove 202 are adapted to the outer shapes of the piston head 101 and the piston skirt 201 to ensure that the piston head 101 and the piston skirt 201 have a certain wall thickness and ensure the structural strength.

[0041] In some examples, an inner cooling chamber 302 is formed between the piston head 101 and the piston skirt 201. The inner cooling chamber 302 is located in the middle of the whole formed by the piston head 101 and the piston skirt 201, and the outer cooling chamber 301 is close to the edge of the whole formed by the piston head 101 and the piston skirt 201. Then, the outer cooling chamber 301 surrounds the outer side of the inner cooling chamber 302, and the inner cooling chamber 302 communicates with the outer cooling chamber 301.

[0042] Furthermore, when the cooling medium enters the outer cooling chamber 301, the cooling medium accumulates in the outer cooling chamber 301. When the cooling medium reaches the set liquid level height, the cooling medium flows from the outer cooling chamber 301 into the inner cooling chamber 302 and finally flows out of the inner cooling chamber 302 to complete the circulating flow of the cooling medium. It can be understood that as the piston moves, the cooling medium in the outer cooling chamber 301 and the inner cooling chamber 302 oscillates to achieve the cooling effect.

[0043] As Figure 3 shown, in some examples, a first inner oscillation groove 103 is provided at the end of the piston head 101, and a second inner oscillation groove 203 is provided at the end of the piston skirt 201. The end of the piston head 101 having the first inner oscillation groove 103 is docked with the end of the piston skirt 201 having the second inner oscillation groove 203, so that the openings of the first inner oscillation groove 103 and the second inner oscillation groove 203 are docked. The first inner oscillation groove 103 and the second inner oscillation groove 203 communicate with each other and jointly form the inner cooling chamber 302. It can be understood that the height of the first inner oscillation groove 103 is greater than the height of the second inner oscillation groove 203.

[0044] In some examples, the piston skirt 201 is provided with a connecting passage 204 that communicates the inner cooling chamber 302 and the outer cooling chamber 301. The holes provided in the piston skirt 201 define the connecting passage 204. When the liquid level of the cooling medium in the outer cooling chamber 301 reaches the height of the connecting passage 204, the cooling medium enters the inner cooling chamber 302 along the connecting passage 204.

[0045] Furthermore, the piston head 101 is provided with a balance passage 104 that communicates the inner cooling chamber 302 and the outer cooling chamber 301. The holes provided in the piston head 101 define the balance passage 104. It can be understood that there is gas in the outer cooling chamber 301. When there is no cooling medium in the outer cooling chamber 301, the outer cooling chamber 301 is filled with gas. When the cooling medium flowing into the passage 402 flows into the outer cooling chamber 301, the volume of the outer cooling chamber 301 that accommodates the gas decreases, which will increase the pressure in the outer cooling chamber 301 and is not conducive to the entry of the cooling medium. At this time, the gas flows between the inner cooling chamber 302 and the outer cooling chamber 301 through the balance passage 104 to balance the pressure in the outer cooling chamber 301, which is conducive to the circulating flow of the cooling medium.

[0046] Specifically, the height of the balance passage 104 is greater than the height of the connecting passage 204. On the premise that the cooling medium can flow into the inner cooling chamber 302 along the connecting passage 204, the liquid level of the cooling medium in the outer cooling chamber 301 is difficult to reach the height of the balance passage 104, avoiding the blockage of the balance passage 104 by the cooling medium and ensuring the natural flow of the gas along the balance passage 104.

[0047] In some examples, the height of the end of the balance passage 104 communicating with the outer cooling chamber 301 is greater than the height of the end of the balance passage 104 communicating with the inner cooling chamber 302. First, it is difficult for the cooling medium in the inner cooling chamber 302 to reach the height of the end of the balance passage 104 communicating with the inner cooling chamber 302, initially avoiding the return of the cooling medium from the inner cooling chamber 302 to the outer cooling chamber 301. At the same time, even if the cooling medium reaches the height of the end of the balance passage 104 communicating with the inner cooling chamber 302, it is necessary to further raise the liquid level to the height of the end of the balance passage 104 communicating with the outer cooling chamber 301 before reverse flow occurs, further avoiding the return of the cooling medium from the inner cooling chamber 302 to the outer cooling chamber 301.

[0048] In some examples, a piston skirt 201 is provided with a return chamber 303. The return chamber 303 is at the bottom of an internal cooling chamber 302. After the cooling medium in the internal cooling chamber 302 reaches a certain liquid level height, it flows into the return chamber 303, thus completing the circulating flow of the cooling medium. Further, an external cooling chamber 301 communicates with the return chamber 303 through a discharge channel 304. Then, the cooling medium in the external cooling chamber 301 can flow into the return chamber 303 along the discharge channel 304, reducing the amount of the cooling medium in the external cooling chamber 301, thereby reducing the filling rate in the external cooling chamber 301, increasing the heat transfer coefficient of the external cooling chamber 301, and enhancing the cooling effect.

[0049] In some examples, the internal cooling chamber 302 communicates with the return chamber 303 through a return channel 305. The holes in the piston skirt 201 define the return channel 305. The cooling medium in the internal cooling chamber 302 flows into the return chamber 303 along the return channel 305.

[0050] In some examples, the side wall of the return channel 305 extends a certain distance into the interior of the internal cooling chamber 302 to form an edge of the return channel 305. When the liquid level of the cooling medium in the internal cooling chamber 302 rises above the height of the side wall of the return channel 305, the cooling medium can reach the return chamber 303 along the return channel 305. It can be understood that when the liquid level of the cooling medium in the internal cooling chamber 302 rises, the filling rate of the cooling medium in the internal cooling chamber 302 increases, ensuring the heat transfer effect of the internal cooling chamber 302.

[0051] Specifically, since the side wall of the return channel 305 extends into the interior of the internal cooling chamber 302, the internal cooling chamber 302 is generally formed in a "U" shape.

[0052] In some examples, the piston oscillating cooling device includes a piston pin 401. The piston pin 401 is connected to the piston skirt 201 and is located on the piston pin seat at the lower part of the piston skirt 201. Among them, during the transportation of the cooling medium, the piston pin 401 can communicate with the external cooling chamber 301, thereby transporting the cooling medium to the external cooling chamber 301.

[0053] Further, the external cooling chamber 301 is provided with an inlet channel 402 extending towards the piston pin 401, and the piston pin 401 is provided with a liquid supply channel. The cooling medium flows out of the piston pin 401 from the liquid supply channel. The liquid supply channel communicates with the inlet channel 402, and the cooling medium can flow into the external cooling chamber 301.

[0054] In the actual implementation process, the cooling medium flows into the relatively large outer cooling chamber 301 along the inlet channel 402 and oscillates in the outer cooling chamber 301. When there is too much cooling medium in the outer cooling chamber 301, the cooling medium flows into the return chamber 303 along the discharge channel 304, reducing the filling rate of the outer cooling chamber 301 and enhancing the cooling effect.

[0055] When the liquid level height of the cooling medium in the outer cooling chamber 301 reaches the height of the connecting channel 204, the cooling medium flows into the inner cooling chamber 302 along the connecting channel 204 and oscillates in the inner cooling chamber 302. When the liquid level height of the cooling medium in the inner cooling chamber 302 does not reach above the sidewall height of the return channel 305, the cooling medium accumulates continuously in the inner cooling chamber 302 to ensure that the inner cooling chamber 302 has a certain filling rate. When the liquid level height of the cooling medium in the inner cooling chamber 302 reaches above the sidewall height of the return channel 305, the cooling medium flows into the return chamber 303.

[0056] In the description of this specification, if there are descriptions of reference terms such as "one embodiment", "some examples", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", it means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0057] The above has described in detail the embodiments of the present application in conjunction with the accompanying drawings. However, the present application is not limited to the above embodiments, and various changes can be made without departing from the gist of the present application within the scope of knowledge possessed by those of ordinary skill in the art.

Claims

1. A piston oscillation cooling device, characterized in that: include: Piston head; A piston skirt, the end of the piston head butts against the end of the piston skirt, the piston head and the piston skirt form an external cooling chamber, the external cooling chamber extends in a direction close to the edge of the piston skirt, and the external cooling chamber extends in a direction close to the edge of the piston head; Wherein, the piston skirt is provided with a reflux chamber, the outer cooling chamber is connected with the reflux chamber through a discharge channel, and the discharge channel is used to allow the cooling medium in the outer cooling chamber to flow into the reflux chamber to reduce the filling rate in the outer cooling chamber.

2. The piston oscillation cooling device according to claim 1, characterized in that: The end of the piston head is provided with a first outer oscillation groove, and the end of the piston skirt is provided with a second outer oscillation groove, and the first outer oscillation groove and the second outer oscillation groove enclose the outer cooling chamber.

3. The piston oscillation cooling device according to claim 2, characterized in that: The first outer oscillation groove comprises a first opening portion and a first bending portion which are connected to each other, the first bending portion is at an angle to the first opening portion, and the first bending portion extends toward the edge of the piston head to increase the volume of the outer cooling chamber; The second outer oscillation groove includes a second opening portion and a second bending portion which are connected to each other, the second bending portion is at an angle to the second opening portion, and the second bending portion extends toward the edge of the piston skirt to increase the volume of the outer cooling chamber.

4. The piston oscillation cooling device according to claim 1, characterized in that: The piston head and the piston skirt form an inner cooling chamber, the outer cooling chamber surrounds the outer side of the inner cooling chamber, and the inner cooling chamber is communicated with the outer cooling chamber.

5. The piston oscillation cooling device according to claim 4, characterized in that: A first inner oscillation groove is disposed at the end of the piston head, and a second inner oscillation groove is disposed at the end of the piston skirt. The first inner oscillation groove and the second inner oscillation groove enclose the inner cooling chamber.

6. The piston oscillation cooling device according to claim 4, characterized in that: The piston skirt is provided with a connecting channel, and the piston head is provided with a balancing channel. The inner cooling chamber and the outer cooling chamber are connected with the balancing channel through the connecting channel. The connecting channel is used to allow the cooling medium in the outer cooling chamber to flow into the inner cooling chamber. The height of the balancing channel is greater than the height of the connecting channel. The balancing channel is used to allow the gas in the inner cooling chamber and the outer cooling chamber to circulate.

7. The piston oscillation cooling device according to claim 6, characterized in that: The height of one end of the balancing channel communicating with the outer cooling chamber is greater than the height of one end of the balancing channel communicating with the inner cooling chamber.

8. The piston oscillation cooling device according to claim 4, characterized in that: The inner cooling chamber is in communication with the reflux chamber via a reflux channel, and the reflux channel is used to allow the cooling medium in the inner cooling chamber to flow into the reflux chamber.

9. The piston oscillation cooling device according to claim 8, characterized in that: The side wall of the reflow channel extends into the inner cooling chamber to increase the filling rate of the cooling medium in the inner cooling chamber.

10. The piston oscillation cooling device according to claim 1, characterized in that: The piston oscillation cooling device comprises a piston pin connected to the piston skirt, the outer cooling chamber is provided with an inlet channel extending toward the piston pin, and the piston pin is used to transport the internal cooling medium to the inlet channel.

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