A piston body reassembling device for a compressor

Abstract

The utility model relates to the technical field of compressor overhauling, especially a piston body back loading device of compressor, including support rod and at least one group of support components, each group of support components includes at least two length adjustable support arms that are evenly arranged along the circumference, one end of the support arm is connected with the support rod, and the other end is used for contacting with the inner wall of cylinder, after length adjustment, the support arm length of the same group of support components is same, the end part of support rod is equipped with the connector, and the connector is connected with the piston body by detachable connection mode, the support rod, the connector and the piston body are coaxial arrangement, the support rod rotates and is used for driving the piston body to rotate, the device can reduce the friction between the piston body and the inner wall of cylinder in the back loading process by slightly lifting the piston body, and reduces the resistance.

Description

Technical Field

[0001] This utility model relates to the field of compressor maintenance technology, and in particular to a piston body reinstallation device for a compressor. Background Technology

[0002] When overhauling reciprocating compressors, it is often necessary to replace vulnerable parts such as piston rings, support rings, and stuffing boxes. This requires removing the piston body, and after replacing the stuffing box, piston rings, and support rings, the piston body needs to be reinstalled. However, reinstalling the piston body is difficult, requiring alignment of the piston rod with the stuffing box opening. Improper hoisting can damage the sealing packing, and if it is misaligned, it is difficult to push the piston body into the cylinder. Therefore, the alignment process is time-consuming and labor-intensive, posing challenges to the maintenance work.

[0003] In the prior art, a Chinese utility model patent document with publication number CN222177592U and publication date of December 17, 2024, was proposed to solve the above-mentioned technical problems. The technical solution disclosed in this patent document is as follows: A combined forward and reverse rotation tool for disassembling and installing a piston rod and a crosshead. The torque transmission rod has a first end and a second end that are far apart from each other. The force-applying component is detachably connected to the first end. The screw assembly includes a fixing block fixed to the second end, and a first screw and a second screw respectively fixed to both sides of the fixing block. The first L-shaped screw is detachably fixed in a lifting ring helical hole of the piston body. The second L-shaped screw is detachably fixed in another lifting ring helical hole of the piston body. When the screw assembly is placed between the first L-shaped screw and the second L-shaped screw and the screw assembly is rotated, the first L-shaped screw abuts against the first screw, and the second L-shaped screw abuts against the second screw to transmit torque.

[0004] During the reinstallation process, the piston body in the above technical solution experiences significant resistance because the lower part of the piston body, under its own weight, generates considerable friction with the inner wall of the cylinder. Summary of the Invention

[0005] To solve the above-mentioned technical problems, this utility model proposes a piston body reinstallation device for a compressor. By slightly raising the piston body, the friction between the piston body and the inner wall of the cylinder can be reduced during the reinstallation process, thereby reducing resistance.

[0006] This utility model is achieved by adopting the following technical solution:

[0007] A piston reinstallation device for a compressor includes a support rod and at least one set of support assemblies. Each set of support assemblies includes at least two circumferentially spaced and length-adjustable support arms. One end of each support arm is connected to the support rod, and the other end is used to contact the inner wall of the cylinder. After length adjustment, the support arms in the same set of support assemblies have the same length. The end of the support rod is provided with a connector, which is detachably connected to the piston body. The support rod, connector, and piston body are coaxially arranged. The rotation of the support rod drives the piston body to rotate.

[0008] The end of the support arm away from the support rod is also provided with a contact block, which is in the shape of an arc that matches the inner wall of the cylinder.

[0009] The support arm includes a ball screw and a slider threadedly connected to the outer surface of the ball screw; the slider rotates to generate relative axial displacement with the ball screw, thereby adjusting the length of the support arm.

[0010] The ball screw is also provided with a limiting nut, which can move along the axial direction of the ball screw and be locked in place.

[0011] Each support assembly includes three spaced-apart arms with an angle of 120° between adjacent arms.

[0012] The support rod is also provided with a rotating handle at the end away from the connector.

[0013] The support rod includes a screw and a support rod body. The connector and the support arm are respectively connected to one end of the screw. The support rod body is connected to the screw via a connecting nut, and the support rod body has an axially extending through hole, through which the screw can slide. The connecting nut can move and lock along the screw axis. After the connecting nut and the screw are fixed, the support rod body rotates to drive the screw and the connector to rotate together.

[0014] The screw is also provided with a positioning nut, which can move along the screw axis and be locked in place to limit the extreme position of the connecting nut on the screw.

[0015] The support arms of the same group of support components are connected to the screw rods through the first fixed seat, and a second fixed seat is also provided between the connector and the first fixed seat.

[0016] The piston body is provided with bolt holes, and the connector is connected to the piston body by bolts.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] 1. In this utility model, at least one set of support components is provided on the support rod. The support component includes at least two adjustable-length support arms. One end of the support arm is connected to the support rod, and the other end is used to contact and cooperate with the inner wall of the cylinder. During the piston body reinstallation process, by adjusting the length of each support arm, the overall outer diameter of the support component is matched with the inner diameter of the cylinder, thereby stably supporting the piston body inside the cylinder.

[0019] Based on this, the contact between the support arm and the cylinder wall slightly raises the piston body, aligning its axis with the cylinder axis, thereby reducing the radial friction between the lower half of the piston body and the cylinder wall caused by its own weight. Simultaneously, because the piston body is stably supported and in a relatively ideal straight state, the relative angle between it and the piston rod remains consistent, avoiding assembly resistance caused by an included angle between them.

[0020] Therefore, during the piston body reassembly process, the reassembly device provided by this utility model can significantly reduce assembly resistance, improve assembly efficiency, and effectively prevent damage to the piston body or cylinder inner wall caused by friction.

[0021] 2. In this utility model, the arc-shaped contact block allows the support arm to better fit the cylindrical surface of the cylinder inner wall, and the pressure applied by the support arm to the cylinder inner wall is more evenly distributed. At the same time, it can reduce the friction and wear between the contact block and the cylinder inner wall.

[0022] 3. The support arm is a ball screw structure, which makes operation simpler.

[0023] 4. The setting of the limit nut can effectively prevent relative axial displacement between the slider and the ball screw during the piston body reinstallation process, thereby ensuring the stability of the support arm length after adjustment.

[0024] 5. Each support assembly includes three spaced-apart support arms, which can provide more stable three-point support and ensure the balance and stability of the piston body during reassembly.

[0025] 6. The rotating handle allows operators to manually rotate the support rod, thereby driving the piston body to rotate synchronously and improving assembly efficiency.

[0026] 7. The support rod includes a screw and a support rod body. The relative position between the screw and the support rod body is adjusted by connecting the nut on the screw, thereby achieving flexible adjustment of the overall length of the support rod to adapt to the reinstallation requirements of piston bodies of different specifications. This device has good versatility and convenience, and can be easily applied to the installation and maintenance of various piston bodies.

[0027] 8. The positioning nut and the connecting nut work together. The mutual pressing between the positioning nut and the connecting nut significantly enhances the fixing effect, ensuring that the overall length of the support rod remains stable after adjustment. This double-nut design not only improves the reliability of the fixing but also effectively prevents loosening caused by vibration or other external forces, ensuring the stability and accuracy of the piston body reinstallation process.

[0028] 9. A second fixing seat is also provided between the connector and the first fixing seat, making the connection between the connector and the screw more secure and enhancing the stability of the overall structure. In addition, because the connector is closer to the support assembly, this not only helps to reduce vibration or displacement caused by long-distance transmission, but also ensures that the force transmission is more direct and efficient during piston body reinstallation, thereby improving the accuracy and reliability of operation.

[0029] 10. The connector and piston body are connected by bolts, which is simple in structure, easy to install and disassemble, and can improve installation accuracy. Attached Figure Description

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments, wherein:

[0031] Figure 1 This is a schematic diagram of the structure of this utility model;

[0032] Figure 2 This is a schematic diagram of the support component in this utility model;

[0033] Figure 3 This is a cross-sectional structural diagram of the connector in this utility model;

[0034] Marked in the image:

[0035] 1. Support arm, 2. Connector, 3. Piston body, 4. Contact block, 5. Ball screw, 6. Slider, 7. Rotary handle, 8. Screw, 9. Support rod body, 10. Connecting nut, 11. Positioning nut, 12. First fixed seat, 13. Second fixed seat, 14. Piston rod, 15. Limit nut. Detailed Implementation

[0036] Example 1

[0037] As a basic embodiment of this utility model, the utility model includes a piston body reinstallation device for a compressor, comprising a support rod and a set of support components. The support components include two circumferentially spaced and adjustable-length support arms 1, spaced 180° apart. One end of each support arm 1 is connected to the support rod, and after length adjustment, the other end of the support arm 1 can contact the inner wall of the cylinder. During piston body reinstallation, the support arms 1 of the same set of support components have the same length.

[0038] The end of the support rod is provided with a connector 2, which is detachably connected to the piston body 3. The support rod, connector 2, and piston body 3 are coaxially arranged. Rotation of the support rod can drive the piston body 3 to rotate, and since the piston rod 14 has threads, it can be reinstalled into the crosshead.

[0039] Example 2

[0040] In a preferred embodiment of this utility model, the present utility model includes a piston body reinstallation device for a compressor, comprising a support rod and two sets of support assemblies. Each set of support assemblies includes two support arms 1 that are evenly spaced circumferentially and whose lengths are adjustable. The structure of the support arms 1 can adopt conventional technical means in the art, for example, the support arms 1 are composed of inner and outer sleeves, and the required length is locked by fixing devices such as positioning pins or locking bolts.

[0041] The included angle between the two support arms 1 of the same support assembly is 180°, and the lengths of the support arms 1 are the same after adjustment. The support arms 1 in the two sets of support assemblies are staggered. One end of each support arm 1 is connected to the support rod, and the other end is used to contact the inner wall of the cylinder. Furthermore, the end of the support arm 1 away from the support rod is also provided with a contact block 4, which is arc-shaped to match the inner wall of the cylinder.

[0042] The end of the support rod is provided with a connector 2, which is detachably connected to the piston body 3. This detachable connection can employ conventional techniques, such as flange connection, pin connection, or keyway connection. The support rod, connector 2, and piston body 3 are coaxially arranged. Rotation of the support rod drives rotation of the piston body 3.

[0043] Example 3

[0044] In another preferred embodiment of this utility model, the present utility model includes a piston body reinstallation device for a compressor, comprising a support rod and a set of support components. The support rod includes a screw 8 and a support rod body 9. The support rod body 9 is connected to the screw 8 via a connecting nut 10, and the support rod body 9 has an axially extending through hole, in which the screw 8 can slidably pass. The connecting nut 10 can move axially along the screw 8 and be locked in place. Specifically, the connection between the connecting nut 10 and the screw 8 can employ conventional techniques in the art, such as a keyway and key connection, a pin and positioning hole connection, or a spline connection, etc.

[0045] Each support assembly includes four circumferentially spaced, adjustable-length support arms 1. The included angle between any two adjacent support arms 1 is 90°. Each support arm 1 includes a ball screw 5 and a slider 6 threadedly connected to the outer surface of the ball screw 5. One end of the ball screw 5 is connected to a screw rod 8, and the slider 6 contacts the inner wall of the cylinder.

[0046] The end of the screw 8 furthest from the support rod body 9 is provided with a connector 2. The connector 2 is detachably connected to the piston body 3. The support rod, connector 2, and piston body 3 are coaxially arranged. After the connecting nut 10 is fixed to the screw 8, the support rod body 9 rotates, which drives the screw 8, support arm 1, and connector 2 to rotate together.

[0047] Example 4

[0048] As another preferred embodiment of this utility model, please refer to the appendix to the specification. Figure 1 This utility model includes a piston reinstallation device for a compressor, comprising a support rod and a set of support components. The support rod includes a screw 8 and a support rod body 9.

[0049] Refer to the instruction manual appendix Figure 2Each support assembly includes three circumferentially spaced, adjustable-length support arms 1, with an included angle of 120° between adjacent support arms 1. Each support arm 1 can employ a ball screw structure, including a ball screw 5 and a slider 6 threadedly connected to the outer surface of the ball screw 5. One end of the ball screw 5 is connected to a screw 8 via a first fixed seat 12. When the slider 6 rotates, it can achieve relative axial displacement with the ball screw 5, thus adjusting the length of the support arm 1. To prevent the slider 6 from rotating during the rotation process after the support arm 1 length adjustment, which would cause relative axial displacement with the ball screw 5, a limiting nut 15 is also provided on the ball screw 5. The limiting nut 15 can move axially along the ball screw 5 and be locked in place. The specific operation is as follows: After loosening the limit nut 15, the limit nut 15 moves along the axis of the ball screw 5 to abut against the slider 6 after the position is adjusted. Then, the limit nut 15 is fixed by means of pin connection or other means to lock its position on the ball screw 5. The abutment between the limit nut 15 and the slider 6 prevents the slider 6 from loosening.

[0050] Furthermore, the end of the support arm 1 away from the support rod is also provided with a contact block 4, which is in the shape of an arc that matches the inner wall of the cylinder.

[0051] The support rod body 9 is connected to the screw 8 via a connecting nut 10, and the support rod body 9 has an axially extending through hole, through which the screw 8 can slide. A rotating handle 7 is also provided at the end of the support rod body 9 away from the screw 8.

[0052] The screw 8 is also provided with a positioning nut 11, which is disposed between the connecting nut 10 and the first fixed seat 12. Both the connecting nut 10 and the positioning nut 11 can move and be locked along the axial direction of the screw 8. Specifically, the connection relationship between the connecting nut 10 and the screw 8, and the connection relationship between the positioning nut 11 and the screw 8 can be achieved using conventional techniques in the art, which will not be elaborated in this embodiment.

[0053] The end of the screw 8 furthest from the support rod body 9 is provided with a connector 2. The connector 2 is detachably connected to the piston body 3. (Refer to the attached instruction manual.) Figure 3 The piston body 3 is provided with bolt holes, and the connecting head 2 is connected to the piston body 3 by bolts. A second fixing seat 13 is also provided between the connecting head 2 and the first fixing seat 12. After the connecting head 2 is connected to the piston body 3, the support rod, the connecting head 2, and the piston body 3 are coaxially arranged.

[0054] When reinstalling the piston body 3, first connect the piston body 3 to the reinstallation device. Then, adjust and fix the length of the support arm 1 so that the outer diameter of the support assembly matches the inner diameter of the cylinder, thereby stably supporting the piston body 3 inside the cylinder. Because the support arm 1 contacts the inner wall of the cylinder, the piston body 3 can be slightly raised, aligning its axis with the cylinder axis, thus reducing the radial friction between the lower half of the piston body 3 and the inner wall of the cylinder due to its own weight. Simultaneously, because the piston body 3 is stably supported and in a relatively ideal straight state, the relative angle between it and the piston rod 14 remains consistent, avoiding assembly resistance caused by an included angle. Apply rotational force by rotating the handle 7, causing the piston body 3 and piston rod 14 to rotate. During rotation, because the piston rod 14 has threads, it can be smoothly reinstalled into the crosshead.

[0055] In summary, any other corresponding modifications made by those skilled in the art based on the technical solution and concept of this utility model without creative mental effort after reading this utility model document are all within the scope of protection of this utility model.

Claims

1. A piston body reinstallation device for a compressor, characterized in that: It includes a support rod and at least one set of support components; each set of support components includes at least two support arms (1) that are evenly spaced circumferentially and whose lengths are adjustable. One end of each support arm (1) is connected to the support rod, and the other end is used to contact the inner wall of the cylinder. After length adjustment, the support arms (1) of the same set of support components have the same length. The end of the support rod is provided with a connector (2), and the connector (2) is connected to the piston body (3) in a detachable manner. The support rod, connector (2) and piston body (3) are coaxially arranged. The support rod rotates to drive the piston body (3) to rotate.

2. The piston body reinstallation device for a compressor according to claim 1, characterized in that: The arm (1) is provided with a contact block (4) at the end away from the support rod. The contact block (4) is in an arc shape that matches the inner wall of the cylinder.

3. The piston body reinstallation device for a compressor according to claim 2, characterized in that: The support arm (1) includes a ball screw (5) and a slider (6) threadedly connected to the outer surface of the ball screw (5); the slider (6) rotates to generate relative axial displacement with the ball screw (5) to realize the length adjustment of the support arm (1).

4. The piston body reinstallation device for a compressor according to claim 3, characterized in that: The ball screw (5) is also provided with a limiting nut (15), which can move along the axial direction of the ball screw (5) and be locked in place.

5. A piston body reinstallation device for a compressor according to claim 4, characterized in that: Each support assembly includes three spaced-apart arms (1), with an included angle of 120° between any two adjacent arms (1).

6. A piston body reinstallation device for a compressor according to claim 1 or 5, characterized in that: The support rod is also provided with a rotating handle (7) at the end away from the connector (2).

7. A piston body reinstallation device for a compressor according to claim 1 or 5, characterized in that: The support rod includes a screw (8) and a support rod body (9). The connector (2) and the support arm (1) are respectively connected to one end of the screw (8). The support rod body (9) is connected to the screw (8) through a connecting nut (10). The support rod body (9) has an axially extending through hole. The screw (8) can slide through the through hole. The connecting nut (10) can move and lock along the axial direction of the screw (8). After the connecting nut (10) is fixed to the screw (8), the support rod body (9) rotates to drive the screw (8) and the connector (2) to rotate together.

8. A piston body reinstallation device for a compressor according to claim 7, characterized in that: The screw (8) is also provided with a positioning nut (11), which can move and lock along the axial direction of the screw (8) to limit the extreme position of the connecting nut (10) on the screw (8).

9. A piston body reinstallation device for a compressor according to claim 8, characterized in that: The arm (1) of the same support assembly is connected to the screw (8) through the first fixed seat (12), and a second fixed seat (13) is provided between the connector (2) and the first fixed seat (12).

10. A piston body reinstallation device for a compressor according to claim 1 or 5, characterized in that: The piston body (3) is provided with bolt holes, and the connector (2) is connected to the piston body (3) by bolts.

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