Opposed piston engine oil duct type cooling piston targeting test bench

Abstract

The invention provides an opposed piston engine oil duct type cooling piston targeting test bed. The opposed piston engine oil duct type cooling piston targeting test bed comprises a simulation cylinder sleeve, a piston head, a fixing bolt, an oil pipe, a molecular flowmeter, an outlet oil duct, an inlet oil duct, an oil tank, a denominator flowmeter, a fixing block, a piston body and an oil pump. The oil duct type cooling piston has the beneficial effect that the targeting efficiency problem of the oil duct type cooling piston of the opposed piston engine can be solved.

Description

Technical Field

[0001] The invention belongs to the technical field of internal combustion engine structure design, and in particular relates to an opposed piston engine oil channel type cooling piston target shooting test bench. Background Art

[0002] At present, four-stroke engines are commonly used in the field of vehicle and ship power. Four-stroke engines are large in size, complex in structure, low in power-to-weight ratio, and poor in compactness. The opposed piston engine eliminates the cylinder head and valve structure, and the opposed pistons are arranged in the same cylinder, which greatly improves compactness and power-to-weight ratio. When the main shaft of the opposed piston engine rotates one circle, each cylinder works twice, which is twice the frequency of the traditional four-stroke engine. The engine heat load increases significantly and the piston deformation increases. In order to avoid the problem of cylinder pulling caused by piston deformation, the opposed piston engine can use a split combined piston, and the piston body and the piston head are connected by fixing bolts. The lateral thrust generated during the conversion of rotational motion and linear motion only acts on the piston body. At the same time, the piston body is far away from the high temperature zone, with small thermal deformation, and it is not easy to pull the cylinder, so lightweight materials can be selected. The piston body and piston head adopt a split structure. The piston head can choose a material different from the piston body according to the requirements of high temperature resistance and corrosion resistance, and the total weight of the entire split combined piston will not increase significantly.

[0003] In order to solve the problem of large heat load on the piston head of the split combined piston, an oil channel cooling system is designed, in which the inlet oil channel of the piston body is connected to the outlet oil channel of the piston head. Oil pressure is established through the gap between the piston body and the inner wall of the cylinder, and the cooling oil enters the interior of the piston head through the inlet oil channel of the piston body and flows out from the oil outlet, taking away the heat of the piston and lowering its temperature. The behavior of the cooling oil flowing from the oil channel inlet to the piston head is called "target shooting". Before the engine leaves the factory, the piston must be subjected to a target shooting test, and there are strict regulations on the target shooting rate. How to conduct accurate target shooting tests on split combined pistons cooled by oil channels is a technical problem that needs to be solved by technicians in this field. Summary of the invention

[0004] In view of this, the present invention aims to provide an opposed-piston engine oil-channel cooling piston target shooting test bench to solve the problem of opposed-piston engine oil-channel cooling piston target shooting efficiency.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] An opposed piston engine oil channel cooling piston target test bench, comprising a simulated cylinder liner, a piston head, a fixing bolt, an oil pipe, a molecular flow meter, an outlet oil channel, an inlet oil channel, an oil tank, a denominator flow meter, a fixing block, a piston body, and an oil pump;

[0007] The piston head and piston body are placed horizontally and have the same diameter, and are connected by a fixing block and fixing bolts;

[0008] The center line of the cylinder liner, the center line of the piston body and the center line of the piston head are at the same position;

[0009] The outlet oil passage and the inlet oil passage are connected to the oil tank through oil pipes. A numerator flow meter is arranged on the oil pipes connecting the outlet oil passage and the oil tank, and a denominator flow meter is arranged on the oil pipes connecting the inlet oil passage and the oil tank.

[0010] Furthermore, there is a gap between the piston head and the piston body;

[0011] There is a gap between the inner wall of the simulated cylinder sleeve and the outer wall of the piston head;

[0012] There is a gap between the inner wall of the simulated cylinder sleeve and the outer wall of the piston body;

[0013] The gap between the piston head and the piston body, the gap between the simulated cylinder liner inner wall and the piston head outer wall, and the gap between the simulated cylinder liner inner wall and the piston body inner wall are consistent with the engine state.

[0014] Furthermore, an inlet oil passage is distributed on the piston body, and an outlet oil passage is distributed on the piston head. The layout position, shape and size of the inlet oil passage and the outlet oil passage are consistent with the engine state.

[0015] Furthermore, the outlet of the inlet oil passage corresponds to the inlet of the outlet oil passage, and the cooling oil establishes oil pressure through the oil pump and flows to the inlet oil passage of the piston body through the oil pipe. At the same time, the oil pressure is strengthened under the action of the gap, and is sprayed into the piston head through the inlet oil passage of the piston body, and flows back to the oil tank through the outlet oil passage of the piston head.

[0016] Furthermore, the collection flow measured by the molecular flowmeter is the numerator, and the injection flow measured by the denominator flowmeter is the denominator. The division between the two can obtain the target efficiency measured by the target test. The cooling oil that does not hit the target is returned to the oil tank through the oil pipe in the gap between the piston head and the piston body.

[0017] Compared with the prior art, the opposed-piston engine oil channel cooling piston target shooting test bench described in the present invention has the following advantages:

[0018] (1) The opposed-piston engine oil channel cooling piston shooting test bench described in the present invention solves the problem of opposed-piston engine oil channel cooling piston shooting efficiency.

[0019] (2) The opposed piston engine oil channel cooling piston shooting test bench described in the present invention has a piston head and a piston body placed horizontally and having the same diameter, and connected by a fixing block and fixing bolts. The outlet oil channel and the inlet oil channel are connected to the oil tank through an oil pipe. A numerator flowmeter is arranged on the oil pipe connecting the outlet oil channel to the oil tank, and a denominator flowmeter is arranged on the oil pipe connecting the inlet oil channel to the oil tank. The outlet of the inlet oil channel corresponds to the inlet of the outlet oil channel. The cooling oil establishes oil pressure through the oil pump and flows to the inlet oil channel of the piston body through the oil pipe. At the same time, the oil pressure is strengthened under the action of the gap, and is sprayed into the piston head through the inlet oil channel of the piston body, and flows back to the oil tank through the outlet oil channel of the piston head. The collected flow measured by the numerator flowmeter is the numerator, and the injection flow measured by the denominator flowmeter is the denominator. The two are divided to obtain the shooting efficiency measured by the shooting test. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0021] Figure 1 It is a schematic diagram of the principle of the test bench described in an embodiment of the present invention.

[0022] Description of reference numerals:

[0023] 1-simulated cylinder liner; 2-piston head; 3-fixing bolt; 4-oil pipe; 5-molecular flowmeter; 6-outlet oil channel; 7-inlet oil channel; 8-oil tank; 9-denominator flowmeter; 10-fixing block; 11-piston body; 12-oil pump. DETAILED DESCRIPTION

[0024] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0027] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0028] like Figure 1 As shown, an opposed piston engine oil channel cooling piston shooting test bench includes a simulated cylinder liner 1, a piston head 2, a fixing bolt 3, an oil pipe 4, a molecular flowmeter 5, an outlet oil channel 6, an inlet oil channel 7, an oil tank 8, a denominator flowmeter 9, a fixing block 10, a piston body 11, and an oil pump 12. The piston head 2 and the piston body 11 are placed horizontally and have the same diameter, and are connected by the fixing block 10 and the fixing bolt 3. The center line of the cylinder liner 1, the center line of the piston body 11, and the center line of the piston head 2 are at the same position. The outlet oil channel 6 and the inlet oil channel 7 are connected to the oil tank 8 through the oil pipe 4, and the molecular flowmeter 5 is arranged on the oil pipe 4 connecting the outlet oil channel 6 and the oil tank 8, and the denominator flowmeter 9 is arranged on the oil pipe 4 connecting the inlet oil channel 7 and the oil tank 8. There is a certain gap between the piston head 2 and the piston body 11, a certain gap between the inner wall of the simulated cylinder liner 1 and the outer wall of the piston head 2, and a certain gap between the inner wall 1 of the simulated cylinder liner and the outer wall of the piston body 11. The gap between the piston head 2 and the piston body 11, the gap between the inner wall of the simulated cylinder sleeve 1 and the outer wall of the piston head 2, and the gap between the inner wall of the simulated cylinder sleeve 1 and the inner wall of the piston body 11 are consistent with the engine state. The piston body 11 is provided with an inlet oil passage 7, and the piston head 2 is provided with an outlet oil passage 6. The layout, shape, and size of the inlet oil passage 7 and the outlet oil passage 6 are consistent with the engine state. The outlet of the inlet oil passage 7 corresponds to the inlet of the outlet oil passage 6. The cooling oil establishes oil pressure through the oil pump 12 and flows to the inlet oil passage 7 of the piston body 11 through the oil pipe 4. At the same time, the oil pressure is strengthened under the action of the gap, and is sprayed into the piston head 2 through the inlet oil passage 7 of the piston body 11, and flows back to the oil tank 8 through the outlet oil passage 6 of the piston head 2. The collection flow measured by the molecular flowmeter 5 is the numerator, and the injection flow measured by the denominator flowmeter 9 is the denominator. The two are divided to obtain the target efficiency measured by the target test. The cooling oil that does not hit the target is returned to the oil tank 8 through the oil pipe 4 in the gap between the piston head 2 and the piston body 11.

[0029] The present invention solves the problem of the target shooting efficiency of the oil channel cooling piston of the opposed piston engine. The piston head and the piston body are placed horizontally and have the same diameter, and are connected by a fixing block and a fixing bolt. The outlet oil channel and the inlet oil channel are connected to the oil tank through an oil pipe. A numerator flowmeter is arranged on the oil pipe connecting the outlet oil channel to the oil tank, and a denominator flowmeter is arranged on the oil pipe connecting the inlet oil channel to the oil tank. The outlet of the inlet oil channel corresponds to the inlet of the outlet oil channel. The cooling oil establishes oil pressure through the oil pump and flows to the inlet oil channel of the piston body through the oil pipe. At the same time, the oil pressure is strengthened under the action of the gap, and is sprayed into the piston head through the inlet oil channel of the piston body, and flows back to the oil tank through the outlet oil channel of the piston head. The collected flow measured by the numerator flowmeter is the numerator, and the injection flow measured by the denominator flowmeter is the denominator. The two are divided to obtain the target shooting efficiency measured by the target shooting test.

[0030] The principle of the exhaust piston motion control system of the Miller cycle of a rotary disk-piston engine is:

[0031] like Figure 1 As shown, the piston head 2 and the piston body 11 are placed horizontally and have the same diameter, and are connected by a fixing block 10 and a fixing bolt 3. The center line of the cylinder sleeve 1, the center line of the piston body 11, and the center line of the piston head 2 are at the same position. The outlet oil passage 6 and the inlet oil passage 7 are connected to the oil tank 8 through the oil pipe 4. The oil pipe 4 connecting the outlet oil passage 6 and the oil tank 8 is provided with a molecular flowmeter 5, and the oil pipe 4 connecting the inlet oil passage 7 and the oil tank 8 is provided with a denominator flowmeter 9. The outlet of the inlet oil passage 7 corresponds to the inlet of the outlet oil passage 6. The cooling oil establishes oil pressure through the oil pump 12, and flows to the inlet oil passage 7 of the piston body 11 through the oil pipe 4. At the same time, the oil pressure is strengthened under the action of the gap, and is sprayed into the piston head 2 through the inlet oil passage 7 of the piston body 11, and flows back to the oil tank 8 through the outlet oil passage 6 of the piston head 2. The collection flow measured by the molecular flowmeter 5 is the numerator, and the injection flow measured by the denominator flowmeter 9 is the denominator. The two are divided to obtain the target efficiency measured by the target test. The cooling oil that does not hit the target is returned to the oil tank 8 through the oil pipe 4 in the gap between the piston head 2 and the piston body 11.

[0032] Example 1

[0033] The present invention proposes an oil channel cooling piston target test bench, such as Figure 1As shown, it includes a simulated cylinder liner 1, a piston head 2, a fixing bolt 3, an oil pipe 4, a molecular flowmeter 5, an outlet oil passage 6, an inlet oil passage 7, an oil tank 8, a denominator flowmeter 9, a fixing block 10, a piston body 11, and an oil pump 12. The piston head 2 and the piston body 11 are both 50 mm in diameter, placed horizontally, and connected by a fixing block 10 and a fixing bolt 3. The center line of the cylinder liner 1, the center line of the piston body 11, and the center line of the piston head 2 are at the same position. The outlet oil passage 6 and the inlet oil passage 7 are connected to the oil tank 8 through the oil pipe 4. The molecular flowmeter 5 is arranged on the oil pipe 4 connecting the outlet oil passage 6 to the oil tank 8, and the denominator flowmeter 9 is arranged on the oil pipe 4 connecting the inlet oil passage 7 to the oil tank 8. There is a certain gap between the piston head 2 and the piston body 11, a certain gap between the inner wall of the simulated cylinder liner 1 and the outer wall of the piston head 2, and a certain gap between the inner wall of the simulated cylinder liner 1 and the outer wall of the piston body 11. The gap between the piston head 2 and the piston body 11, the gap between the inner wall of the simulated cylinder sleeve 1 and the outer wall of the piston head 2, and the gap between the inner wall of the simulated cylinder sleeve 1 and the inner wall of the piston body 11 are consistent with the engine state. The piston body 11 is provided with an inlet oil passage 7, and the piston head 2 is provided with an outlet oil passage 6. The layout, shape, and size of the inlet oil passage 7 and the outlet oil passage 6 are consistent with the engine state. The outlet of the inlet oil passage 7 corresponds to the inlet of the outlet oil passage 6. The cooling oil establishes oil pressure through the oil pump 12 and flows to the inlet oil passage 7 of the piston body 11 through the oil pipe 4. At the same time, the oil pressure is strengthened under the action of the gap, and is sprayed into the piston head 2 through the inlet oil passage 7 of the piston body 11, and flows back to the oil tank 8 through the outlet oil passage 6 of the piston head 2. The oil pressure at the oil pump 12 is 500 kPa, the injection flow rate measured by the numerator flowmeter 5 is 60 g / s, and the collection flow rate measured by the denominator flowmeter 9 is 76 g / s. The two are divided to obtain the target shooting efficiency of 79% measured by the target shooting test. The cooling oil that does not hit the target is returned to the oil tank 8 through the oil pipe 4 in the gap between the piston head 2 and the piston body 11.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An opposed piston engine oil channel cooling piston target test bench, characterized in that: Including simulated cylinder sleeve, piston head, fixing bolts, oil pipe, molecular flow meter, outlet oil channel, inlet oil channel, oil tank, denominator flow meter, fixing block, piston body, oil pump; The piston head and piston body are placed horizontally and have the same diameter, and are connected by fixing blocks and fixing bolts; The center line of the cylinder liner, the center line of the piston body and the center line of the piston head are at the same position; The outlet oil passage and the inlet oil passage are connected to the oil tank through oil pipes. A numerator flow meter is arranged on the oil pipes connecting the outlet oil passage and the oil tank, and a denominator flow meter is arranged on the oil pipes connecting the inlet oil passage and the oil tank.

2. The opposed piston engine oil gallery cooling piston target shooting test bench according to claim 1, characterized in that: There is a gap between the piston head and the piston body.

3. The opposed piston engine oil gallery cooling piston target shooting test bench according to claim 1, characterized in that: There is a gap between the inner wall of the simulated cylinder sleeve and the outer wall of the piston head.

4. The opposed piston engine oil gallery cooling piston target shooting test bench according to claim 1, characterized in that: There is a gap between the inner wall of the simulated cylinder sleeve and the outer wall of the piston body.

5. The opposed piston engine oil gallery cooling piston target shooting test bench according to claims 2-4, characterized in that: The gap between the piston head and the piston body, the gap between the simulated cylinder liner inner wall and the piston head outer wall, and the gap between the simulated cylinder liner inner wall and the piston body inner wall are consistent with the engine state.

6. The opposed piston engine oil gallery cooling piston target shooting test bench according to claim 1, characterized in that: The piston body is provided with an inlet oil passage, and the piston head is provided with an outlet oil passage. The arrangement position, shape and size of the inlet oil passage and the outlet oil passage are consistent with the engine state.

7. The opposed piston engine oil gallery cooling piston target shooting test bench according to claim 1, characterized in that: The outlet of the inlet oil passage corresponds to the inlet of the outlet oil passage. The cooling oil establishes oil pressure through the oil pump and flows to the inlet oil passage of the piston body through the oil pipe. At the same time, the oil pressure is enhanced under the action of the gap, and is sprayed into the piston head through the inlet oil passage of the piston body, and flows back to the oil tank through the outlet oil passage of the piston head.

8. The opposed piston engine oil gallery cooling piston target shooting test bench according to claim 1, characterized in that: The collection flow measured by the molecular flowmeter is the numerator, and the injection flow measured by the denominator flowmeter is the denominator. The two are divided to obtain the target efficiency measured by the target test. The cooling oil that does not hit the target is returned to the oil tank through the oil pipe in the gap between the piston head and the piston body.

Images