Packing press-fitting device and packing press-fitting method

Abstract

This invention relates to the field of packing sealing technology, specifically to a packing press-fitting device and a packing press-fitting method. The packing press-fitting device includes a first press-fitting ring with an adjusting bolt at its left end and a second press-fitting ring at its right end. An insertion groove is provided on the inner wall of the right end of the first press-fitting ring. The first press-fitting ring includes a first upper press-fitting ring and a first lower press-fitting ring, and the second press-fitting ring includes a second upper press-fitting ring and a second lower press-fitting ring. The first and second press-fitting rings are fixedly connected by fastening screws. The packing press-fitting method includes a packing bushing with a packing end cap on its left side. A packing cavity is provided between the packing bushing and the pump body. The packing press-fitting method includes the following steps: first, installing the packing; second, installing the second press-fitting ring; third, installing the first press-fitting ring; fourth, pressing the packing; and fifth, removing the press-fitting fixture. This invention provides accurate packing press-fitting, good sealing, minimal disassembly and assembly, and convenient and rapid assembly.

Description

Technical Field

[0001] This invention relates to the field of packing sealing technology, specifically to a packing press-fitting device and a method for press-fitting packing into place. Background Technology

[0002] Packing, also known as sealing packing, experiences wear during pump operation. As wear deepens, pump leakage increases, gradually diminishing the sealing effect. Excessive wear can even damage adjacent components. To prevent this, packing must be replaced when worn to a certain extent to maintain sealing performance. Currently, replacing packing requires transporting the pump back to the factory for disassembly, removing the pump shaft, and then replacing the packing – a time-consuming and labor-intensive process. Furthermore, packing typically fits onto a packing sleeve, forming a packing cavity between the sleeve and the pump body. Multiple packing pieces are usually installed within this cavity. The outer packing is secured by end caps, but the inner packing, due to its deeper installation depth and smaller cavity space, has limited operational space. This makes it difficult to install the innermost packing piece properly, affecting the sealing effect, compromising pump leakage, and ultimately impacting overall pump performance. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a packing press-fitting device and method that features an ingenious structure, proper packing press-fitting, good sealing performance, minimal disassembly and assembly, convenient assembly, and rapid packing press-fitting.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A packing press-fitting device, characterized in that it includes a first press-fitting ring, an adjusting bolt at the left end of the first press-fitting ring, and a second press-fitting ring at the right end. The left end face of the first press-fitting ring has an axially arranged adjusting threaded hole, the outer wall of the right end of the first press-fitting ring has a radially arranged fastening through hole, and the inner wall of the right end of the first press-fitting ring has an insertion groove. The first press-fitting ring includes a first upper press-fitting ring and a first lower press-fitting ring, with the two ends of the first upper press-fitting ring and the two ends of the first lower press-fitting ring abutting against each other. The adjusting bolt is threadedly connected to either the first upper press-fitting ring or the first lower press-fitting ring.

[0006] The outer diameter of the right end of the second press-fit ring is the same as that of the first press-fit ring, and the inner diameter of the second press-fit ring is the same as that of the left end of the first press-fit ring. The outer diameter of the right end of the second press-fit ring is larger than that of the left end of the second press-fit ring. A connecting threaded hole is provided radially on the outer wall of the left end of the second press-fit ring. The second press-fit ring includes a second upper press-fit ring and a second lower press-fit ring. The two ends of the second upper press-fit ring and the two ends of the second lower press-fit ring abut against each other. The left ends of the second upper press-fit ring and the second lower press-fit ring are inserted into the insertion grooves of the first upper press-fit ring and the first lower press-fit ring. The fastening screw passes through the fastening through hole and is threaded into the connecting threaded hole to fix the first upper press-fit ring, the first lower press-fit ring, the second upper press-fit ring and the second lower press-fit ring in place. When using, first place the second press-fit ring between the packing sleeve and the packing cavity, then place the first press-fit ring, fix the first press-fit ring to the second press-fit ring with the fastening screw, and push the first press-fit ring and the second press-fit ring forward by pushing the adjusting bolt until the packing is pressed into place.

[0007] A method for press-fitting packing includes a packing bushing, a packing end cap fitted on the left side of the packing bushing, and a packing cavity between the packing bushing and the pump body. The method is characterized by the following steps:

[0008] Step 1, install the packing: Move the packing end cap axially to the left, take a piece of packing, put the packing on the packing sleeve through the gap between the packing end cap and the packing cavity, and push it into the packing cavity to the right;

[0009] The second step is to install the second press-fit ring: With the right end of the second upper press-fit ring and the right end of the second lower press-fit ring facing the packing, pass them through the gap between the packing end cap and the packing cavity. The second upper press-fit ring and the second lower press-fit ring are fitted onto the packing sleeve, and the right end face of the second upper press-fit ring and the right end face of the second lower press-fit ring simultaneously abut against the left end face of the packing. This pushes the second upper press-fit ring and the second lower press-fit ring to the right, and the second upper press-fit ring and the second lower press-fit ring push the packing to the right side of the packing cavity.

[0010] Third step, install the first press-fit ring: When the connecting threaded holes at the left end of the second upper press-fit ring and the left end of the second lower press-fit ring move to the left side of the packing cavity and are about to enter the packing cavity, stop pushing the second upper press-fit ring and the second lower press-fit ring. Take the first upper press-fit ring and the first lower press-fit ring. First, rotate the adjusting bolts on the first upper press-fit ring and the first lower press-fit ring to the right to the end. Then, with the insertion grooves of the first upper press-fit ring and the first lower press-fit ring facing the direction of the second press-fit ring, pass the first upper press-fit ring and the first lower press-fit ring through the gap between the packing end cap and the packing cavity. The first upper press-fit ring and the first lower press-fit ring are fitted onto the packing shaft sleeve. The insertion grooves of the first upper press-fit ring and the first lower press-fit ring are fitted onto the second upper press-fit ring and the second lower press-fit ring. Take the fastening screw, pass the fastening through hole and thread it into the connecting threaded hole to fix the first upper press-fit ring, the first lower press-fit ring, the second upper press-fit ring and the second lower press-fit ring in place.

[0011] Step 4, tightening the packing: Push the packing end cap axially to the right until it contacts the adjusting bolt. Continue pushing the packing end cap to the right. The packing end cap pushes the adjusting bolt, which in turn pushes the first and second pressing rings to the right. The second pressing ring then pushes the packing to the right.

[0012] When the packing end cap is about to touch the outer wall of the left end of the packing cavity, move the packing end cap axially to the left, and then rotate the adjusting bolt in the opposite direction to move the adjusting bolt to the left relative to the packing a certain distance. The distance from the left end of the adjusting bolt to the left end of the first upper pressing ring or the first lower pressing ring becomes longer. Then move the packing end cap axially to the right until the packing end cap contacts the adjusting bolt. Continue to push the packing end cap to the right. The packing end cap pushes the adjusting bolt, and the adjusting bolt pushes the first pressing ring and the second pressing ring to the right. The second pressing ring pushes the packing to the right, pressing the packing into place.

[0013] Step 5: Remove the pressing fixture: After the packing is pressed into place, move the packing end cap axially to the left. Pull the first pressing ring to the left using the adjusting bolt until the fastening screws protrude from the packing cavity. Remove all the fastening screws in sequence, and then remove the first upper pressing ring and the first lower pressing ring. Then remove the second upper pressing ring and the second lower pressing ring to facilitate pressing the packing into place as needed during use. The length of the adjusting bolt protruding from the first pressing ring is adjustable, which makes it easy to press different packings into packing cavities of different depths and press them into place.

[0014] Due to the above-mentioned structure, the present invention has the advantages of ingenious structure, proper packing, good sealing performance, less disassembly and assembly, convenient and quick assembly. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the packing press-fitting device of the present invention.

[0016] Figure 2 This is a schematic diagram of the packing press-fitting method of the present invention.

[0017] Reference numerals: 1. First press-fit ring; 2. Adjusting bolt; 3. Second press-fit ring; 4. Fastening screw; 5. Packing bushing; 6. Packing end cover; 7. Pump body; 8. Packing cavity; 9. Packing. Detailed Implementation

[0018] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0019] As attached Figure 1A packing press-fitting device, characterized in that it includes a first press-fitting ring 1, an adjusting bolt 2 at the left end of the first press-fitting ring 1, and a second press-fitting ring 3 at the right end. The left end face of the first press-fitting ring 1 has an axially oriented adjusting threaded hole, and the outer wall of the right end of the first press-fitting ring 1 has a radially oriented fastening through hole. The inner wall of the right end of the first press-fitting ring 1 has an insertion groove. The first press-fitting ring 1 includes a first upper press-fitting ring and a first lower press-fitting ring. The two ends of the first upper press-fitting ring and the two ends of the second press-fitting ring 3 abut against each other. The adjusting bolt 2 is threadedly connected to either the first upper press-fitting ring or the first lower press-fitting ring. The outer diameter of the right end of the second press-fitting ring 3 is the same as the outer diameter of the first press-fitting ring 1, and the inner diameter of the second press-fitting ring 3 is the same as the inner diameter of the left end of the first press-fitting ring 1. The outer diameter of the right end of the second press-fitting ring 3 is larger than that of the first press-fitting ring 3. The outer diameter of the left end of the second press-fit ring 3 is radially provided with a connecting threaded hole on the outer wall of the left end. The second press-fit ring 3 includes a second upper press-fit ring and a second lower press-fit ring. The two ends of the second upper press-fit ring and the two ends of the second lower press-fit ring abut against each other. The left ends of the second upper press-fit ring and the second lower press-fit ring are inserted into the insertion grooves of the first upper press-fit ring and the first lower press-fit ring. The fastening screw 4 passes through the fastening through hole and is threadedly connected to the connecting threaded hole to fix the first upper press-fit ring, the first lower press-fit ring, the second upper press-fit ring and the second lower press-fit ring in place. When using the second press-fit ring, firstly place the second press-fit ring between the packing sleeve and the packing cavity, then place the first press-fit ring in, and fix the first press-fit ring to the second press-fit ring with the fastening screw. Push the first press-fit ring and the second press-fit ring forward by pushing the adjusting bolt until the packing is pressed into place.

[0020] As attached Figure 2 A method for press-fitting packing includes a packing sleeve 5, a packing end cap 6 fitted on the left side of the packing sleeve 5, the packing end cap 6 being fixedly connected to a pump body 7 by bolts and nuts, forming a packing cavity 8 between the packing sleeve 5 and the pump body 7, and multiple packing 9s typically installed in the packing cavity 8, filling the packing cavity 8 completely, with the outermost packing 9 abutting against the packing end cap 6. The packing 9s need to be installed one by one. The method is characterized by the following steps:

[0021] Step 1, install packing 9: Remove the bolts and nuts between the packing end cover 6 and the pump body 7. The packing end cover 6 can be moved left and right along the packing shaft sleeve 5. Move the packing end cover 6 axially to the left, take a piece of packing 9, pass it through the gap between the packing end cover 6 and the packing cavity 8, put the packing 9 on the packing shaft sleeve 5, and manually push it into the packing cavity 8 to the right.

[0022] The second step is to install the second press-fit ring 3: push the packing 9 into the packing cavity 8 a certain distance to the right, so that the gap between the left end of the packing 9 and the right end of the packing end cap 6 can accommodate the second press-fit ring 3. Simultaneously face the right end of the second upper press-fit ring and the right end of the second lower press-fit ring towards the packing 9, and pass through the gap between the packing end cap 6 and the packing cavity 8. The second upper press-fit ring and the second lower press-fit ring are fitted onto the packing sleeve 5. The right end face of the second upper press-fit ring and the right end face of the second lower press-fit ring simultaneously abut against the left end face of the packing 9. Then push the second upper press-fit ring and the second lower press-fit ring to move to the right at the same time. The second upper press-fit ring and the second lower press-fit ring push the packing 9 to move to the right side of the packing cavity 8.

[0023] Third step, install the first press-fit ring 1: When the connecting threaded holes at the left end of the second upper press-fit ring and the left end of the second lower press-fit ring move to the left side of the packing cavity 8 and are about to enter the packing cavity 8, stop pushing the second upper press-fit ring and the second lower press-fit ring. Take the first upper press-fit ring and the first lower press-fit ring. First, rotate the adjusting bolt 2 on the first upper press-fit ring and the first lower press-fit ring to the right until it is fully rotated. Then, with the insertion grooves of the first upper press-fit ring and the first lower press-fit ring facing the second press-fit ring 3, pass the first upper press-fit ring and the first lower press-fit ring through the gap between the packing end cover 6 and the packing cavity 8. The first upper press-fit ring and the first lower press-fit ring are fitted together. On the packing sleeve 5, the insertion grooves of the first upper press-fit ring and the first lower press-fit ring are fitted onto the second upper press-fit ring and the second lower press-fit ring. A fastening screw 4 is taken, and the fastening screw 4 passes through the fastening through hole and is threadedly connected to the connecting threaded hole. The first upper press-fit ring is fixedly connected to the second upper press-fit ring and the second lower press-fit ring through the fastening screw 4. The first lower press-fit ring is fixedly connected to the second upper press-fit ring and the second lower press-fit ring through the fastening screw 4. In this way, the first upper press-fit ring, the first lower press-fit ring, the second upper press-fit ring and the second lower press-fit ring are fixedly connected. The height of the upper end face of the fastening screw 4 is not higher than the height of the upper end face of the first press-fit ring 1.

[0024] Step 4, tightening the packing 9: Push the packing end cap 6 axially to the right until it contacts the adjusting bolt 2. Continue pushing the packing end cap 6 to the right. The packing end cap 6 pushes the adjusting bolt 2, which in turn pushes the first pressing ring 1 and the second pressing ring 3 to the right. The second pressing ring 3 then pushes the packing 9 to the right.

[0025] When the packing end cap 6 is about to touch the outer wall of the left end of the packing cavity 8, move the packing end cap 6 axially to the left, and then rotate the adjusting bolt 2 in the opposite direction, so that the adjusting bolt 2 moves a certain distance to the left relative to the packing 9. The distance from the left end of the adjusting bolt 2 to the left end of the first upper pressing ring or the first lower pressing ring becomes longer. Then move the packing end cap 6 axially to the right. The packing end cap 6 contacts the adjusting bolt 2. Continue to push the packing end cap 6 to the right. The packing end cap 6 pushes the adjusting bolt 2. The adjusting bolt 2 pushes the first pressing ring 1 and the second pressing ring 3 to the right. The second pressing ring 3 pushes the packing 9 to the right, pressing the packing 9 into place.

[0026] Step 5: Remove the press-fit fixture: After the packing 9 is press-fitted into place, move the packing end cover 6 axially to the left, and pull the first press-fit ring 1 to the left by adjusting the bolt 2 until the fastening screw 4 is exposed outside the packing cavity 8. Remove all the fastening screws 4 in sequence, remove the first upper press-fit ring and the first lower press-fit ring, and then remove the second upper press-fit ring and the second lower press-fit ring.

[0027] Step 6: Take the second packing 9, pass it through the gap between the packing end cap 6 and the packing cavity 8, put the packing 9 on the packing sleeve 5, and manually push it into the packing cavity 8 to the right.

[0028] Step 7: Repeat steps 2 through 5.

[0029] Step 8: Take the third packing 9, put the packing 9 on the packing sleeve 5 through the gap between the packing end cap 6 and the packing cavity 8, and push it into the packing cavity 8 to the right.

[0030] Step 9: Repeat steps 2 through 5; and so on, pushing the required number of packing 9s into the packing cavity 8. As more and more packing 9s are loaded into the packing cavity 8,

[0031] When the distance from the left end of the packing 9 in the packing cavity 8 to the packing end cap 6 is insufficient to accommodate the packing press-fitting device, stop using the packing press-fitting device to press the packing. The remaining packing 9 in the packing cavity 8 can be press-fitted using only the second press-fitting ring 3 and the packing end cap 6. That is, after inserting the packing 9, repeat the second step: insert the second press-fitting ring 3, and then push the second press-fitting ring 3 to the right through the packing end cap 6. The second press-fitting ring 3 pushes the packing 9 to the right, pressing the packing 9 into place. This process is repeated.

[0032] When the distance from the left end of the packing 9 in the packing cavity 8 to the packing end cap 6 is insufficient to accommodate the second pressing ring 3, the packing end cap 6 is used for pressing. That is, the packing end cap 6 is moved axially to the left, a packing 9 is taken and passed through the gap between the packing end cap 6 and the packing cavity 8, the packing 9 is put on the packing sleeve 5, and manually pushed into the packing cavity 8 to the right. Then the packing end cap 6 is pushed to the right, and the packing end cap 6 presses the packing 9 into place. In this way, all the packing 9 in the packing cavity 8 are pressed into place. After pressing is completed, the packing end cap 6 is moved to the right, and the left end of the packing end cap 6 abuts against the packing 9 in the packing cavity 8. The packing end cap 6 is fixed to the outer wall of the packing cavity 8 with bolts and nuts.

[0033] This invention features a clever structure that eliminates the need to disassemble the entire water pump. Only the packing end cap needs to be removed, the damaged packing removed, and new packing inserted and tightened as described above. In the fourth step of packing tightening, after the adjusting bolt is rotated in the opposite direction, the distance the adjusting bolt moves to the left relative to the packing can be determined based on the depth of the packing cavity, the width of the packing, the initial distance from the left end of the adjusting bolt to the right end of the second pressing ring in the packing pressing device, and the required depth of packing insertion into the packing cavity. The distance the adjusting bolt is rotated to the left is determined, and then the packing is pressed into place in one go. The outer diameter of the first pressing ring matches the inner diameter of the packing cavity, the inner diameter of the left end of the first pressing ring matches the outer diameter of the packing sleeve, the inner diameter of the second pressing ring matches the outer diameter of the packing sleeve, and the outer diameter of the right end of the second pressing ring matches the inner diameter of the packing cavity. The first and second pressing rings are each designed as two halves. This invention facilitates the insertion of the second upper and lower press-fit rings into the packing cavity through the gap between the packing end cap and the packing cavity. After the second upper press-fit ring and the second lower press-fit ring enter the packing cavity, they are limited by the packing bushing and the inner wall of the packing cavity, so that the two ends of the second upper press-fit ring and the two ends of the second lower press-fit ring abut against each other. The closing directions of the first upper press-fit ring and the first lower press-fit ring are staggered from the closing directions of the second upper press-fit ring and the second lower press-fit ring. This facilitates the fixing of the first upper press-fit ring to the second upper press-fit ring and the second lower press-fit ring by fastening screws. The number of adjusting bolts and fastening bolts can be set as needed. Multiple adjusting bolts are set to ensure that the first press-fit ring is evenly stressed when the packing end cap pushes the adjusting bolts. Multiple fastening screws are set to facilitate the fixing of the first press-fit ring and the second press-fit ring. This invention has an ingenious structure, the packing can be compressed, pressed into place, and has good sealing performance.

[0034] Due to the above-mentioned structure, the present invention has the advantages of ingenious structure, proper packing, good sealing performance, less disassembly and assembly, convenient and quick assembly.

Claims

1. A packing press-fitting device, characterized in that: The device includes a first press-fit ring, an adjusting bolt at its left end, and a second press-fit ring at its right end. The left end face of the first press-fit ring has an axially oriented adjusting threaded hole, and the outer wall of its right end has a radially oriented fastening through hole. The inner wall of the right end of the first press-fit ring has an insertion groove. The adjusting bolt is threadedly connected to the first press-fit ring. The outer diameter of the right end of the second press-fit ring is the same as the outer diameter of the first press-fit ring, and the inner diameter of the second press-fit ring is the same as the inner diameter of the left end of the first press-fit ring. The outer diameter of the right end of the second press-fit ring is larger than the outer diameter of the left end of the second press-fit ring. The outer wall of the left end of the second press-fit ring has a radially oriented connecting threaded hole. The left end of the second press-fit ring is inserted into the insertion groove of the first press-fit ring and fixedly connected to the first press-fit ring by a fastening screw.

2. The packing press-fitting device according to claim 1, characterized in that: The first press-fit ring includes a first upper press-fit ring and a first lower press-fit ring. The two ends of the first upper press-fit ring and the two ends of the first lower press-fit ring abut against each other. The adjusting bolt is threadedly connected to the first upper press-fit ring or the first lower press-fit ring. The second press-fit ring includes a second upper press-fit ring and a second lower press-fit ring. The two ends of the second upper press-fit ring and the two ends of the second lower press-fit ring abut against each other. The left end of the second upper press-fit ring and the left end of the second lower press-fit ring are inserted into the insertion grooves of the first upper press-fit ring and the first lower press-fit ring. The fastening screw passes through the fastening through hole and is threadedly connected to the connecting threaded hole, thereby fixing the first upper press-fit ring, the first lower press-fit ring, the second upper press-fit ring and the second lower press-fit ring together.

3. A method for press-fitting packing into place using the packing press-fitting device according to claim 2, comprising a packing bushing, a packing end cap fitted on the left side of the packing bushing, and a packing cavity provided between the packing bushing and the pump body, characterized in that: The packing press-fitting process includes the following steps: Step 1, Installing the packing: Move the packing end cap axially to the left, take a packing piece, and through the gap between the packing end cap and the packing cavity, put the packing piece onto the packing shaft sleeve and push it into the packing cavity to the right; The second step is to install the second press-fit ring: With the right end of the second upper press-fit ring and the right end of the second lower press-fit ring facing the packing, pass them through the gap between the packing end cap and the packing cavity. The second upper press-fit ring and the second lower press-fit ring are fitted onto the packing sleeve, and the right end face of the second upper press-fit ring and the right end face of the second lower press-fit ring simultaneously abut against the left end face of the packing. This pushes the second upper press-fit ring and the second lower press-fit ring to the right, and the second upper press-fit ring and the second lower press-fit ring push the packing to the right side of the packing cavity. Third step, install the first press-fit ring: When the connecting threaded holes at the left end of the second upper press-fit ring and the left end of the second lower press-fit ring move to the left side of the packing cavity and are about to enter the packing cavity, stop pushing the second upper press-fit ring and the second lower press-fit ring. Take the first upper press-fit ring and the first lower press-fit ring. First, rotate the adjusting bolts on the first upper press-fit ring and the first lower press-fit ring to the right to the end. Then, with the insertion grooves of the first upper press-fit ring and the first lower press-fit ring facing the direction of the second press-fit ring, pass the first upper press-fit ring and the first lower press-fit ring through the gap between the packing end cap and the packing cavity. The first upper press-fit ring and the first lower press-fit ring are fitted onto the packing shaft sleeve. The insertion grooves of the first upper press-fit ring and the first lower press-fit ring are fitted onto the second upper press-fit ring and the second lower press-fit ring. Take the fastening screw, pass the fastening through hole and thread it into the connecting threaded hole to fix the first upper press-fit ring, the first lower press-fit ring, the second upper press-fit ring and the second lower press-fit ring in place. Step 4, tightening the packing: Push the packing end cap axially to the right until it contacts the adjusting bolt. Continue pushing the packing end cap to the right. The packing end cap pushes the adjusting bolt, which in turn pushes the first and second pressing rings to the right. The second pressing ring pushes the packing to the right. When the packing end cap is about to touch the outer wall of the left end of the packing cavity, move the packing end cap axially to the left. Then, rotate the adjusting bolt in the opposite direction to move the adjusting bolt a certain distance to the left relative to the packing. Then, move the packing end cap axially to the right until it contacts the adjusting bolt. Continue pushing the packing end cap to the right. The packing end cap pushes the adjusting bolt, which in turn pushes the first and second pressing rings to the right. The second pressing ring pushes the packing to the right, thus pressing the packing into place. Step 5: Remove the press-fitting fixture: After the packing is press-fitted into place, move the packing end cap axially to the left, and pull the first press-fitting ring to the left by adjusting the bolts until the fastening screws are exposed outside the packing cavity. Remove all the fastening screws in sequence, and remove the first upper press-fitting ring and the first lower press-fitting ring. Then remove the second upper press-fitting ring and the second lower press-fitting ring.

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