Hydraulic cylinder suitable for high-temperature environment

Abstract

The hydraulic cylinder suitable for the high-temperature environment comprises a cylinder body, a piston rod, a front end and a rear end, the piston rod is movably arranged on the cylinder body, the front end and the rear end are arranged on the two sides of the cylinder body respectively, a first oil port is formed in the front end, a second oil port is formed in the rear end, and the first oil port and the second oil port are communicated with the cylinder body; wherein the outer circumferential surface of the cylinder body is sleeved with an oil cooling sleeve, a spiral flow channel is formed in the oil cooling sleeve, the oil cooling sleeve is provided with an oil inlet tangent to the spiral flow channel, and the oil cooling sleeve is provided with an oil outlet tangent to the spiral flow channel. The cylinder body is cooled through the oil cooling sleeve, the spiral flow channel and cooling oil in the oil cooling sleeve and the spiral flow channel, and high temperature of the external environment is prevented from being transmitted into the cylinder body. The flow direction of cooling oil is regulated through tangential arrangement of the oil inlet and the spiral flow channel, it is ensured that the cooling oil can be rapidly discharged out of the spiral flow channel, and coking caused by the fact that the oil is accumulated in the spiral flow channel for a long time is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of oil cylinders, in particular to a hydraulic cylinder suitable for high temperature environments. Background Art

[0002] The hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swinging motion). It has a simple structure and reliable operation. When using it to achieve reciprocating motion, the deceleration device can be eliminated, and there is no transmission gap and the movement is smooth. Therefore, it is widely used in the hydraulic systems of various machines.

[0003] When the hydraulic cylinder is used in a high temperature environment, the effect of preventing high temperature inside the hydraulic cylinder by only using a heat insulation layer is poor, and the existing oil cooling technology has great shortcomings and is prone to coking in a high temperature environment, affecting its cooling performance. Utility Model Content

[0004] The technical problem to be solved by the utility model is: the utility model provides a hydraulic cylinder suitable for high temperature environment, so as to solve the problem that the oil coking affects the cooling performance under the high temperature environment.

[0005] The technical solution adopted by the utility model to solve the technical problem is: a hydraulic cylinder suitable for high temperature environment, including a cylinder body, a piston rod movably arranged on the cylinder body, and a front end and a rear end respectively arranged on both sides of the cylinder body, the front end is provided with a first oil port, the rear end is provided with a second oil port, the first oil port and the second oil port are connected to the cylinder body; wherein, the outer circumferential surface of the cylinder body is provided with an oil cooling sleeve, a spiral flow channel is provided in the oil cooling sleeve, the oil cooling sleeve is provided with an oil inlet tangent to the spiral flow channel, and the oil cooling sleeve is provided with an oil outlet tangent to the spiral flow channel.

[0006] The utility model has the following beneficial effects: the piston rod is arranged in the cylinder body, and one end extends out of the cylinder body, a front end is arranged on the side where the piston rod extends out, and a rear end is arranged on the other side where the front end is arranged, and the reciprocating movement of the piston rod is realized by the oil inlet and outlet of the first oil port and the second oil port. The cylinder body is cooled by the oil cooling sleeve, the spiral flow channel and the cooling oil inside thereof, so as to prevent the high temperature of the external environment from being transmitted to the inside of the cylinder body. The oil cooling sleeve is preferably fixed to the cylinder body by an adhesive, and the adhesive is a high temperature resistant adhesive.

[0007] In detail, the oil is discharged tangentially from the first oil port into the spiral flow channel. At this time, the cooling oil has little speed loss, and the cooling oil quickly flows through the spiral flow channel and is discharged from the oil outlet to the oil cooling sleeve to take away the heat. The flow direction of the cooling oil is regulated by the tangential setting of the oil inlet and the spiral flow channel to ensure that the cooling oil can be quickly discharged from the spiral flow channel, thereby avoiding the accumulation of oil in the spiral flow channel for too long and causing coking.

[0008] Preferably, a plurality of oil baffles are arranged at intervals on a side of the spiral flow channel away from the cylinder body, and the oil baffles are provided with an oil-facing surface and a mounting surface, and the oil-facing surface is arc-shaped.

[0009] Preferably, the oil cooling sleeve is provided with a first annular groove, an annular airbag is provided in the first annular groove, the annular airbag is filled with helium, and the cylinder body is provided with a second annular groove adapted to the annular airbag.

[0010] Preferably, a guide sleeve is provided between the front end and the piston rod;

[0011] And / or, the piston rod is provided with a protrusion.

[0012] Preferably, an O-ring is provided between the guide sleeve and the front end;

[0013] And / or, the piston rod is connected with a front ear.

[0014] Preferably, a guide belt, a sealing ring and a dust ring are sequentially arranged between the guide sleeve and the piston rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional structural schematic diagram of a hydraulic cylinder suitable for high temperature environment;

[0016] Figure 2 It is a cross-sectional view of a hydraulic cylinder suitable for high temperature environment;

[0017] Figure 3 for Figure 2 A partial enlarged view of the middle A;

[0018] Figure 4 It is a cross-sectional schematic diagram of the oil baffle.

[0019] In the figure: 1, rear end; 2, second oil port; 3, oil outlet; 4, oil cooling sleeve; 5, oil inlet; 6, front end; 7, front ear; 8, spiral flow channel; 9, piston rod; 91, protrusion; 10, cylinder body; 11, oil baffle; 111, oil facing surface; 112, mounting surface; 12, guide sleeve; 13, first oil port; 14, first ring groove; 15, annular airbag; 16, O-ring. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0021] In this article, the terms "upper, lower, inside, outside" and the like are established based on the positional relationships shown in the drawings. The corresponding positional relationships may also change depending on the drawings, and therefore cannot be understood as absolute limitations on the scope of protection; moreover, relational terms such as "first" and "second" and the like are merely used to distinguish one component from another with the same name, and do not necessarily require or imply any actual relationship or order between these components.

[0022] Example

[0023] like Figure 1-4 As shown, a hydraulic cylinder suitable for high temperature environment includes a cylinder body 10, a piston rod 9 movably arranged on the cylinder body 10, a front end 6 and a rear end 1 respectively arranged on both sides of the cylinder body 10, the front end 6 is provided with a first oil port 13, the rear end 1 is provided with a second oil port 2, the first oil port 13 and the second oil port 2 are connected to the cylinder body 10; wherein, an oil cooling sleeve 4 is sleeved on the outer circumference of the cylinder body 10, a spiral flow channel 8 is arranged in the oil cooling sleeve 4, the oil cooling sleeve 4 is provided with an oil inlet 5 tangent to the spiral flow channel 8, and the oil cooling sleeve 4 is provided with an oil outlet 3 tangent to the spiral flow channel 8.

[0024] Specifically, the piston rod 9 is arranged in the cylinder body 10, and one end of the piston rod 9 extends out of the cylinder body 10, the front end 6 is arranged on the side where the piston rod 9 extends out, and the rear end 1 is arranged on the other side where the front end 6 is arranged, and the reciprocating movement of the piston rod 9 is realized by the oil inlet and outlet of the first oil port 13 and the second oil port 2. The cylinder body 10 is cooled by the oil cooling sleeve 4, the spiral flow channel 8 and the cooling oil inside thereof to prevent the high temperature of the external environment from being transmitted to the inside of the cylinder body 10. The oil cooling sleeve 4 is preferably fixed to the cylinder body 10 by an adhesive, and the adhesive is a high temperature resistant adhesive.

[0025] In detail, the oil is discharged tangentially from the first oil port 13 into the spiral flow channel 8. At this time, the speed loss of the cooling oil is small, and the cooling oil quickly flows through the spiral flow channel 8 and is discharged from the oil outlet 3 to the oil cooling sleeve 4 to take away the heat. The flow direction of the cooling oil is regulated by the tangential setting of the oil inlet 5 and the spiral flow channel 8 to ensure that the cooling oil can be quickly discharged from the spiral flow channel 8, thereby preventing the oil from accumulating in the spiral flow channel 8 for too long and causing coking.

[0026] The applicant needs to emphasize that the oil cooling structure in the oil cooling sleeve 4, that is, the structure forming the cooling oil circuit, is regarded as a mature prior art, which at least includes a cooling oil source, a waste oil source and a power source, and its specific structure will not be elaborated in detail here.

[0027] Furthermore, a plurality of oil baffles 11 are arranged at intervals on the side of the spiral flow channel 8 away from the cylinder body 10. The oil baffles 11 are provided with an oil facing surface 111 and a mounting surface 112. The oil facing surface 111 is arc-shaped, and the x direction is the flow direction of the cooling oil. In the process of the cooling oil flowing through the oil baffles 11, the cooling oil close to the side of the oil cooling sleeve 4 flows to the side away from the oil cooling sleeve 4 under the guidance of the oil facing surface 111, and forms a vortex at the end of the oil baffle 11, so that the cooling oil is fully mixed to avoid overheating and coking of the cooling oil close to the side of the oil cooling sleeve 4.

[0028] Furthermore, the oil cooling sleeve 4 is provided with a first annular groove 14, in which an annular airbag 15 is provided, and the annular airbag 15 is filled with helium. The cylinder body 10 is provided with a second annular groove adapted for the annular airbag 15. The annular airbag 15 plays a sealing role. When the hydraulic cylinder works in a high temperature environment, the helium filled therein can expand at high temperature, thereby enhancing the sealing effect of the annular airbag 15.

[0029] Furthermore, a guide sleeve 12 is provided between the front end 6 and the piston rod 9; the guide sleeve 12 is used to guide the piston rod 9. And / or, the piston rod 9 is provided with a protrusion 91. The protrusion 91 is used to increase the contact area between the piston rod 9 and the working oil in the cylinder body 10. The piston rod 9 is heated by contact with the external environment, and the heat is transferred from the piston rod 9 to the cylinder body 10 through the working oil and taken away by the oil cooling system.

[0030] Furthermore, an O-ring 16 is provided between the guide sleeve 12 and the front end 6 ; the O-ring 16 is used for sealing.

[0031] And / or, the piston rod 9 is connected with a front ear 7. The front ear 7 is used to connect the load

[0032] Furthermore, a guide belt, a sealing ring, and a dust ring are sequentially arranged between the guide sleeve 12 and the piston rod 9. The guide belt is used to guide the piston rod 9, and the sealing ring is used to seal. The sealing ring is preferably one or a combination of YX-d ring and BSJ step seal. The dust ring is used to prevent dust, and the dust ring is preferably a J-type dust ring. The dust ring is located on the side away from the inside of the cylinder body 10, the guide belt is located on the side close to the inside of the cylinder body 10, and the sealing ring is located between the dust ring and the guide belt.

[0033] The above-mentioned technical features can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A hydraulic cylinder suitable for high temperature environment, characterized in that: It comprises a cylinder body (10), a piston rod (9) movably arranged on the cylinder body (10), a front end (6) and a rear end (1) respectively arranged on both sides of the cylinder body (10), the front end (6) being provided with a first oil port (13), the rear end (1) being provided with a second oil port (2), the first oil port (13) and the second oil port (2) being connected to the cylinder body (10); The outer circumferential surface of the cylinder body (10) is sleeved with an oil cooling sleeve (4), a spiral flow channel (8) is arranged in the oil cooling sleeve (4), the oil cooling sleeve (4) is provided with an oil inlet (5) tangent to the spiral flow channel (8), and the oil cooling sleeve (4) is provided with an oil outlet (3) tangent to the spiral flow channel (8).

2. A hydraulic cylinder suitable for high temperature environment according to claim 1, characterized in that: A plurality of oil baffles (11) are arranged at intervals on a side of the spiral flow channel (8) away from the cylinder body (10), and the oil baffles (11) are provided with an oil-facing surface (111) and a mounting surface (112), and the oil-facing surface (111) is arc-shaped.

3. A hydraulic cylinder suitable for high temperature environment according to claim 2, characterized in that: The oil cooling sleeve (4) is provided with a first annular groove (14), an annular airbag (15) is provided in the first annular groove (14), the annular airbag (15) is filled with helium, and the cylinder body (10) is provided with a second annular groove adapted to fit the annular airbag (15).

4. The hydraulic cylinder suitable for high temperature environment according to claim 1, characterized in that: A guide sleeve (12) is provided between the front end (6) and the piston rod (9); And / or, the piston rod (9) is provided with a protrusion (91).

5. A hydraulic cylinder suitable for high temperature environment according to claim 4, characterized in that: An O-ring (16) is provided between the guide sleeve (12) and the front end (6); And / or, the piston rod (9) is connected to a front ear (7).

6. The hydraulic cylinder suitable for high temperature environment according to claim 4, characterized in that: A guide belt, a sealing ring, and a dust ring are arranged in sequence between the guide sleeve (12) and the piston rod (9).

Images