Thermal insulation hydraulic cylinder

Abstract

The thermal insulation hydraulic cylinder comprises a piston rod, a cylinder body, a front cover and a rear cover, the front cover and the rear cover are arranged on the two sides of the cylinder body respectively, the front cover is provided with a first oil port, the rear cover is provided with a second oil port, 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 a water cooling jacket, a heat insulation layer is arranged in the cylinder body, flanges are arranged between the front cover and the cylinder body and between the rear cover and the cylinder body, the flanges are in threaded connection with the cylinder body, fasteners are arranged between the front cover and the rear cover and between the rear cover and the flanges, and the water cooling jacket is arranged on the flanges. The cylinder body and the external environment are prevented from being isolated through the water-cooled jacket and cooling water in the water-cooled jacket, high temperature of the external environment is prevented from being transmitted into the cylinder body, meanwhile, heat of the cooling water in the water-cooled jacket is further prevented from being transmitted into the cylinder body through the heat insulation layer, and the heat insulation performance of the cylinder body is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil cylinders, in particular to a heat-insulating hydraulic cylinder. 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 long-term radiation causes the overall temperature of the hydraulic cylinder to rise, which leads to increased oil temperature, oil deterioration, and premature aging of seals, which seriously affects the service life of the hydraulic cylinder. How to improve the working environment temperature of the hydraulic cylinder has become a top priority. Utility Model Content

[0004] The technical problem to be solved by the utility model is: the utility model provides a heat-insulating hydraulic cylinder to solve the problem of short service life of the hydraulic cylinder in a high-temperature environment.

[0005] The technical solution adopted by the utility model to solve the technical problem is: an insulated hydraulic cylinder, comprising a piston rod, a cylinder body, a front cover and a rear cover respectively arranged on both sides of the cylinder body, the front cover is provided with a first oil port, the rear cover is provided with a second oil port, the first oil port and the second oil port are connected to the cylinder body;

[0006] Among them, the outer circumferential surface of the cylinder body is covered with a water cooling jacket, a heat insulation layer is arranged inside the cylinder body, flanges are arranged between the front cover and the rear cover and the cylinder body, the flanges are screwed to the cylinder body, fasteners are arranged between the front cover and the rear cover and the flanges, and the water cooling jacket is arranged on the flanges.

[0007] The beneficial effects of the utility model are as follows: the piston rod is arranged in the cylinder body, and one end extends out of the cylinder body, a front cover is arranged on the side where the piston rod extends out, and a rear cover is arranged on the other side where the front cover is arranged, and the reciprocating movement of the piston rod is realized by the oil in and out of the first oil port and the second oil port. The cylinder body is prevented from being isolated from the external environment by the water cooling jacket and the cooling water inside it, and the high temperature of the external environment is prevented from being transferred to the inside of the cylinder body. At the same time, the heat insulation layer is used to further prevent the heat of the cooling water in the water cooling jacket from being transferred into the cylinder body, thereby further improving the heat insulation performance of the cylinder body. The water cooling jacket is preferably fixed to the flange by an adhesive, and the adhesive is a high temperature resistant adhesive.

[0008] Preferably, a water inlet is provided on the vertical middle side of the water cooling jacket, and water outlets are provided on both vertical sides of the water cooling jacket.

[0009] Preferably, water baffles are arranged at intervals on the inner circumferential surface of the water cooling jacket, and a water dividing plate is arranged on the cylinder body adjacent to the water inlet.

[0010] Preferably, a stepped protrusion is provided at the connection between the flange and the front cover, a stepped protrusion is provided at the connection between the flange and the rear cover, and both the front cover and the rear cover are provided with a stepped groove adapted to the stepped protrusion.

[0011] Preferably, an O-ring is provided between the cylinder body and the front cover or the rear cover;

[0012] And / or. The piston rod is connected with a front ear, and the rear cover is connected with a rear ear.

[0013] Preferably, a guide belt, a sealing ring and a dust ring are sequentially arranged between the cylinder body and the piston rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a cross-sectional view of a heat-insulating hydraulic cylinder;

[0015] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0016] Figure 3 for Figure 1 A partial enlarged view of point B in the middle;

[0017] Figure 4 for Figure 1 A partial enlarged view of the middle C;

[0018] Figure 5 A side view of a heat-insulating hydraulic cylinder.

[0019] In the figure: 1. front ear; 2. piston rod; 3. second oil port; 4. water cooling jacket; 5. first oil port; 6. rear cover; 7. rear ear; 8. cylinder body; 9. flange; 10. water outlet; 11. water baffle; 12. thermal insulation layer; 13. water inlet; 14. water distribution plate; 17. dust ring; 18. sealing ring; 19. guide belt; 20. stepped protrusion; 21. fastener; 22. front cover. 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] The height direction of the cylinder body 8 is vertical.

[0023] Example

[0024] like Figure 1-5 As shown, an insulated hydraulic cylinder includes a piston rod 2, a cylinder body 8, a front cover 22 and a rear cover 6 respectively arranged on both sides of the cylinder body 8, the front cover 22 is provided with a first oil port 5, the rear cover 6 is provided with a second oil port 3, the first oil port 5 and the second oil port 3 are connected to the cylinder body 8; wherein, a water cooling jacket 4 is provided on the outer circumference of the cylinder body 8, a heat insulating layer 12 is provided in the cylinder body 8, a flange 9 is provided between the front cover 22 and the rear cover 6 and the cylinder body 8, the flange 9 is screwed to the cylinder body 8, a fastener 21 is provided between the front cover 22 and the rear cover 6 and the flange 9, and the water cooling jacket 4 is provided on the flange 9.

[0025] Specifically, the piston rod 2 is arranged in the cylinder body 8, and one end extends out of the cylinder body 8. A front cover 22 is arranged on the side where the piston rod 2 extends out, and a rear cover 6 is arranged on the other side where the front cover 22 is arranged. The reciprocating movement of the piston rod 2 is realized by the oil in and out of the first oil port 5 and the second oil port 3. The cylinder body 8 is prevented from being isolated from the external environment by the water cooling jacket 4 and the cooling water inside it, and the high temperature of the external environment is prevented from being transferred to the inside of the cylinder body 8. At the same time, the heat insulation layer 12 is used to further prevent the heat of the cooling water in the water cooling jacket 4 from being transferred to the cylinder body 8, thereby further improving the heat insulation performance of the cylinder body 8. The water cooling jacket 4 is preferably fixed to the flange 9 by an adhesive, and the adhesive is a high temperature resistant adhesive.

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

[0027] Furthermore, a water inlet 13 is provided on the vertical middle side of the water cooling jacket 4, and water outlets 10 are provided on both vertical sides of the water cooling jacket 4. Cooling water enters the water cooling jacket 4 from the water inlet 13 and is discharged from the water outlets 10 on both vertical sides. By arranging the water inlet 13 in the middle, the travel of the cooling water in the water cooling jacket 4 can be reduced, thereby preventing the water cooling jacket 4 from overheating and affecting the thermal insulation performance of the cylinder body 8.

[0028] Furthermore, water baffles 11 are arranged at intervals on the inner circumferential surface of the water cooling jacket 4, and a water dividing plate 14 is arranged near the water inlet 13 of the cylinder body 8. By setting the water dividing plate 14, the cooling water can be roughly diverted to both sides. The water baffles 11 can cause the cooling water to generate a vortex inside the water cooling jacket 4, fully stir the cooling water, and avoid boiling caused by excessive local temperature.

[0029] Furthermore, a stepped protrusion 20 is provided at the connection between the flange 9 and the front cover 22, a stepped protrusion 20 is provided at the connection between the flange 9 and the rear cover 6, and both the front cover 22 and the rear cover 6 are provided with stepped grooves adapted to the stepped protrusion 20. Flanges 9 are provided on both sides of the cylinder body 8, the flange 9 provided at the front cover 22 is provided with a stepped protrusion 20 adapted to the stepped groove of the front cover 22, and the flange 9 provided at the rear cover 6 is provided with a stepped protrusion 20 adapted to the stepped groove of the rear cover 6, and the stepped protrusion 20 is used to increase the contact area between the cylinder body 8 and the front cover 22 and the rear cover 6, so as to facilitate the transfer of heat from the front cover 22 and the rear cover 6 to the flange 9 and take it away by cooling water.

[0030] Further, an O-ring is provided between the cylinder body 8 and the front cover 22 or the rear cover 6; the O-ring is used for sealing. And / or. The piston rod 2 is connected with a front ear 1, and the rear cover 6 is connected with a rear ear 7. The front ear 1 is used to connect the load, and the rear ear 7 is used to fix the cylinder body 8.

[0031] Furthermore, a guide belt 19, a sealing ring 18, and a dust ring 17 are sequentially arranged between the cylinder body 8 and the piston rod 2. The guide belt 19 is used to guide the piston rod 2, and the sealing ring 18 is used for sealing. The sealing ring 18 is preferably one or a combination of a YX-d ring and a BSJ step seal. The dust ring 17 is used for dust prevention, and the dust ring 17 is preferably a J-type dust ring. The dust ring 17 is located on the side away from the inside of the cylinder body 8, the guide belt 19 is located on the side close to the inside of the cylinder body 8, and the sealing ring 18 is located between the dust ring 17 and the guide belt 19.

[0032] 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 heat-insulating hydraulic cylinder, characterized in that: It comprises a piston rod (2), a cylinder body (8), a front cover (22) and a rear cover (6) respectively arranged on both sides of the cylinder body (8), the front cover (22) being provided with a first oil port (5), the rear cover (6) being provided with a second oil port (3), the first oil port (5) and the second oil port (3) being connected to the cylinder body (8); The outer circumferential surface of the cylinder body (8) is provided with a water cooling jacket (4), a heat insulating layer (12) is provided inside the cylinder body (8), a flange (9) is provided between the front cover (22) and the rear cover (6) and the cylinder body (8), the flange (9) is screwed to the cylinder body (8), a fastener (21) is provided between the front cover (22) and the rear cover (6) and the flange (9), and the water cooling jacket (4) is provided on the flange (9).

2. A heat-insulating hydraulic cylinder according to claim 1, characterized in that: A water inlet (13) is provided on the vertical middle side of the water cooling jacket (4), and water outlets (10) are provided on both vertical sides of the water cooling jacket (4).

3. A heat-insulating hydraulic cylinder according to claim 2, characterized in that: The inner circumferential surface of the water cooling jacket (4) is provided with water baffles (11) at intervals, and the cylinder body (8) is provided with a water dividing plate (14) adjacent to the water inlet (13).

4. The heat-insulating hydraulic cylinder according to claim 1, characterized in that: A stepped protrusion (20) is provided at a connection between the flange (9) and the front cover (22), a stepped protrusion (20) is provided at a connection between the flange (9) and the rear cover (6), and both the front cover (22) and the rear cover (6) are provided with a stepped groove adapted to fit the stepped protrusion (20).

5. The heat-insulating hydraulic cylinder according to claim 1, characterized in that: An O-ring is provided between the cylinder body (8) and the front cover (22) or the rear cover (6); And / or, the piston rod (2) is connected to the front ear (1), and the rear cover (6) is connected to the rear ear (7).

6. The heat-insulating hydraulic cylinder according to claim 1, characterized in that: A guide belt (19), a sealing ring (18), and a dustproof ring (17) are arranged in sequence between the cylinder body (8) and the piston rod (2).

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