An auxiliary mounting device for a mechanical seal assembly and method of use

Abstract

An auxiliary installation device and a use method of a mechanical seal device, comprising a fixing device and an assembling device; the assembling device comprises a pressing plate, the pressing plate comprises a pressing plate hole, a pressing hole and a lower pressing hole, a double-end stud is inserted into the lower pressing hole; the other end of the double-end stud is inserted into the fixing device; in use, first, the transmission shaft, the double-end stud and the fixing device are connected, then the mechanical seal device is installed on the transmission shaft, then the pressing plate is connected with the transmission shaft and one end of the double-end stud, then the pressing plate is moved downward along the transmission shaft, at this time, the pressing plate compresses the mechanical seal device, then the mechanical seal device is limited, then the pressing plate is removed, and the mechanical seal device rebounds to complete the sealing effect; the force of the pressing plate on the mechanical seal device is uniform, so that the compression performance of the mechanical seal device is good, and the rebound of the mechanical seal device is uniform, so that the sealing effect is good. Therefore, the compression performance of the mechanical seal device is good, and the sealing effect of the mechanical seal device is good.

Description

Technical Field

[0001] This invention relates to an auxiliary installation device and its usage method, belonging to the field of water jet propulsion devices, and particularly to an auxiliary installation device and its usage method for a mechanical seal device. Background Technology

[0002] A water jet propulsion device is a special power device that obtains thrust by using the reaction force of water jets from a propulsion pump. To prevent backflow of water, the sealing of the drive shaft in the flow channel is very important. Therefore, a mechanical seal device is used to achieve the sealing effect of the drive shaft.

[0003] Chinese patent application number 202322090380.X, filed on August 4, 2023, discloses a water jet propulsion device, including a housing. The housing has an intake pipe, an outlet, and a shaft tube communicating with its inner cavity. A thrust bearing seat is located at the end of the shaft tube. An impeller shaft with an impeller mounted inside the housing is arranged. One end of the impeller shaft is rotatably mounted in a rectifier seat within the housing, and the other end passes through the shaft tube and is located in the thrust bearing seat. A mechanical seal is installed inside the shaft tube, and an elastic retaining ring is provided on the shaft tube. A retaining ring is provided on the impeller shaft. The mechanical seal is sleeved on the impeller shaft and limited between the elastic retaining ring and the retaining ring. Although this design allows the mechanical seal to be installed using the elastic retaining ring, it still has the following drawbacks: In this design, when the mechanical seal is installed and limited by the elastic retaining ring, the elastic retaining ring provides a reaction force to compress the mechanical seal. However, during the compression process, the reaction force provided by the elastic retaining ring is uneven, resulting in poor compression performance of the mechanical seal and thus poor sealing effect.

[0004] The information disclosed in this background section is intended only to enhance understanding of the overall background of this application and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to overcome the defects and problems of poor compression performance of mechanical seal devices in the prior art, which leads to poor sealing effect of mechanical seal devices, and to provide an auxiliary installation device and method of use that improves the compression performance of mechanical seal devices and improves the sealing effect of mechanical seal devices.

[0006] To achieve the above objectives, the technical solution of the present invention is: An auxiliary installation device for a mechanical seal device, the device comprising a fixing device and an assembly device; The assembly device includes a pressure plate and a clamping screw. The pressure plate has a pressure plate hole in the middle, and the middle part of the drive shaft is inserted into the pressure plate hole. The movement stroke of the pressure plate is along the axis of the drive shaft. The bottom of the pressure plate is connected to the top of the mechanical seal device. A clamping hole is provided on the side wall of the pressure plate, and a clamping screw is inserted into the clamping hole. Multiple pressing holes are evenly distributed on the edge of the pressure plate, and one end of a double-ended stud is inserted into the pressing hole. The other end of the double-ended stud is inserted into the stud hole of the fixing device. The middle part of the fixing device is a fixing hole, and one end of the drive shaft is inserted into the fixing hole. The top of the fixing device is connected to the bottom of the mechanical seal retaining ring. One end of the mechanical seal retaining ring is connected to the outer surface of the mechanical seal device. The inner surface of the mechanical seal device is connected to the outer surface of the mechanical seal bushing. The inner surface of the mechanical seal bushing is connected to the outer surface of the drive shaft.

[0007] The fixing device includes a base, a rolling bearing and a bearing bushing. A stud hole is provided on the top edge of the base. The inner surface of the base is connected to the outer surface of the rolling bearing. The inner surface of the rolling bearing is connected to the outer surface of the bearing bushing. The middle part of the bearing bushing is a fixing hole.

[0008] A pressure nut is fitted onto the end of the double-ended stud located outside the pressure hole, and a round nut is fitted onto the end of the drive shaft located outside the fixing hole.

[0009] A method for using an auxiliary installation device for a mechanical seal, the method comprising the following steps: Step 1: First insert one end of the drive shaft into the fixing hole, then fix the drive shaft; Step 2: First connect the outer surface of the drive shaft to the inner surface of the mechanical seal bushing, then connect the outer surface of the mechanical seal device to the mechanical seal retaining ring, and then insert the double-ended studs into the stud holes in sequence. Step 3: First, fit the pressure plate hole of the pressure plate onto the end of the drive shaft away from the fixed device. At the same time, insert the double-ended stud into the lower pressure hole. Then, move the pressure plate along the drive shaft axis towards the fixed device until the top of the pressure plate connects with the top of the mechanical seal device. Then, screw the clamping screw into the clamping hole to fix the mechanical seal device to the pressure plate. Then, move the pressure plate downward to compress the mechanical seal device from its free height to its minimum height. Then, limit the mechanical seal device outside the pressure plate hole. Then, unscrew the clamping screw from the clamping hole to release the mechanical seal device from the pressure plate. Then, move the pressure plate away from the fixed device. At the same time, the mechanical seal device springs back, thus completing the initial installation process of the mechanical seal device. Step 4: Perform a pump pressure test on the mechanical seal device. Once the pump pressure test is passed, the installation of the mechanical seal device is complete.

[0010] In the fourth step, the pump pressure test includes both static pump pressure test and dynamic pump pressure test.

[0011] In the fourth step, the static pump pressure test involves first installing a sealing seat on top of the mechanical seal retaining ring, then installing a pressure cap on top of the sealing seat, then installing a drive shaft sleeve between the pressure cap and the drive shaft, then fixing the drive shaft sleeve, then moving the pressure cap downwards to compress the mechanical seal device to a static height, and then pumping pressure from the pump port of the sealing seat into its interior to perform a static pump pressure test.

[0012] In the fourth step, a top sealing ring is provided on the top of the sealing seat, a bottom sealing ring is provided on the bottom of the sealing seat, and a lip seal is provided on the end of the pressure cap near the transmission shaft sleeve.

[0013] In the fourth step, the static height is 55.5 mm to 56.5 mm.

[0014] In the fourth step, the dynamic pump pressure test involves first adjusting the position of the pressure cap so that the distance between the mechanical seal bushing and the mechanical seal retaining ring is the test distance, and then rotating the drive shaft to perform the dynamic pump pressure test.

[0015] In the fourth step, the test interval is 1.8 to 2.2 millimeters.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In the auxiliary installation device and usage method of the mechanical seal device of the present invention, the device includes a fixing device and an assembly device. The assembly device includes a pressure plate and a clamping screw. A drive shaft is inserted into the middle of the pressure plate. A mechanical seal bushing, a mechanical seal device, and a mechanical seal retaining ring are sequentially fitted around the drive shaft. Clamping holes are evenly distributed on the pressure plate. One end of a double-ended stud is inserted into the clamping hole. The bottom of the pressure plate is connected to the top of the mechanical seal device. The other end of the double-ended stud is inserted into the fixing device. The other end of the drive shaft is inserted into the fixing device. In application, the drive shaft is first fixed to the fixing device, and then the mechanical seal bushing is sequentially installed on the drive shaft. The mechanical seal bushing, mechanical seal device, and mechanical seal retaining ring are installed. Then, a double-ended stud is inserted into the stud hole. A pressure plate is then connected to the drive shaft and the corresponding double-ended stud. The pressure plate is then lowered along the drive shaft. After the pressure plate connects with the mechanical seal device, a clamping screw is screwed into the pressure plate to secure it to the mechanical seal device. The pressure plate continues to lower until the mechanical seal device is compressed to its minimum height. A split ring is then installed to limit the mechanical seal device. The clamping screw and pressure plate are then removed. At this point, the mechanical seal device springs back to connect with the split ring, completing the installation of the mechanical seal device. The advantages of this invention also include: First, the bottom of the pressure plate is a flat structure. Therefore, when the pressure plate moves downward to compress the mechanical seal, the top of the mechanical seal is subjected to uniform force. That is, the compressive force on the spring inside the mechanical seal is uniform, resulting in good compression performance of the mechanical seal. After the pressure plate is removed, the spring force generated when it rebounds is uniform. Therefore, the top of the mechanical seal can generate sufficient clamping force under the action of the spring force, resulting in good sealing effect of the mechanical seal. Secondly, one end of the double-ended stud is inserted into the fixing device for fixation, and the other end of the double-ended stud is inserted into the pressure plate to provide guidance for the pressure plate as it descends along the drive shaft, preventing the pressure plate from tilting and ensuring that the pressure plate is perpendicular to all the double-ended studs during its descent. Therefore, the bottom of the pressure plate is parallel to the top of the mechanical seal device, thereby generating uniform downward pressure. Therefore, the present invention provides better compression performance of the mechanical seal device and improves the sealing effect of the mechanical seal device.

[0017] 2. In the auxiliary installation device and usage method of the mechanical seal device of the present invention, the fixing device includes a base, a rolling bearing and a bearing bushing. A lower pressure nut is fitted on the end of the double-ended stud outside the pressure plate, and a round nut is fitted on the end of the drive shaft outside the fixing device. In application, the drive shaft is fixed by the round nut. While the pressure plate moves downward along the drive shaft, all the lower pressure nuts are turned simultaneously. The lower pressure nuts are threadedly connected to the double-ended stud, so the lower pressure nuts gradually descend along the double-ended stud, and then the lower pressure nuts drive the pressure plate to gradually move downward along the drive shaft. When turning the lower pressure nuts, the movement distance of the lower pressure nuts can be precisely controlled, thereby accurately controlling the compression distance of the mechanical seal device. Therefore, the present invention has a better control effect on the compression of the mechanical seal device.

[0018] 3. In the auxiliary installation device and usage method of the mechanical seal device of the present invention, after the mechanical seal device is installed, static pump pressure test and dynamic pump pressure test are performed on the mechanical seal device. In the static pump pressure test, the sealing seat, pressure cap, transmission shaft sleeve and related sealing devices are installed first, and then the mechanical seal device is compressed to the static height through the pressure cap. Then, pump pressure is applied from the pump pressure port of the sealing seat to its interior to perform the static pump pressure test. During application, the mechanical seal device comes into contact with the water flow sprayed by the water pump, so the pump pressure test of the mechanical seal device is very important. At this time, the pump pressure process is moved forward to verify the installation effect of the mechanical seal device in advance, avoiding insufficient time for remedial action when problems are discovered later. Therefore, the present invention has a better testing effect on the mechanical seal device.

[0019] 4. In the auxiliary installation device and usage method of the mechanical seal device of the present invention, in the fourth step, after performing the static pump pressure test, the position of the gland is adjusted so that the mechanical seal bushing and the mechanical seal retaining ring are at the test distance, and then the drive shaft is rotated to perform the dynamic pump pressure test. No parts need to be replaced; only the position of the gland needs to be adjusted to perform the dynamic pump pressure test on the mechanical seal device, thus the testing efficiency is high. Therefore, the testing efficiency of the present invention is high. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention.

[0021] Figure 2 This is a structural schematic diagram of the free height in Example 1.

[0022] Figure 3 yes Figure 1 Top view.

[0023] Figure 4 yes Figure 1 A schematic diagram of the assembly device.

[0024] Figure 5 yes Figure 1 A schematic diagram of the fixing device in the middle.

[0025] Figure 6 This is a schematic diagram of the structure of Example 3.

[0026] Figure 7 yes Figure 6 Schematic diagram of the medium pressure cover.

[0027] Figure 8 This is a structural schematic diagram of Example 4.

[0028] Figure 9 yes Figure 8 A schematic diagram of the structure of the test spacing.

[0029] Figure 10 yes Figure 8 A schematic diagram of the structure of the middle lip seal.

[0030] Figure 11 yes Figure 8 Top view.

[0031] In the diagram: Fixing device 1, stud hole 11, fixing hole 12, base 13, rolling bearing 14, bearing bushing 15, assembly device 2, pressure plate 21, pressure plate hole 211, clamping hole 212, lower clamping hole 213, clamping screw 22, double-ended stud 23, lower clamping nut 231, drive shaft 3, mechanical seal device 31, free height 311, minimum height 312, static height 313, mechanical seal retaining ring 32, test spacing 321, mechanical seal bushing 33, round nut 34, split ring installation position 35, sealing seat 4, pump port 41, top sealing ring 42, bottom sealing ring 43, water flow pump pressure direction 44, pressure cover 5, drive shaft bushing 51, lip seal 52, tooling sealing ring 53, cover O-ring 54. Detailed Implementation

[0032] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Please see Figure 1 — Figure 11 An auxiliary installation device for a mechanical seal device, the device comprising a fixing device 1 and an assembly device 2; The assembly device 2 includes a pressure plate 21 and a clamping screw 22. The middle part of the pressure plate 21 is a pressure plate hole 211, and the middle part of the drive shaft 3 is inserted into the pressure plate hole 211. The movement stroke of the pressure plate 21 is along the axis of the drive shaft 3. The bottom of the pressure plate 21 is connected to the top of the mechanical seal device 31. A clamping hole 212 is provided on the side wall of the pressure plate 21, and a clamping screw 22 is inserted into the clamping hole 212. A plurality of pressing holes 213 are evenly distributed on the edge of the pressure plate 21, and one end of a double-ended stud 23 is inserted into the pressing hole 213. The other end of the double-ended stud 23 is inserted into the stud hole 11 of the fixing device 1. The middle part of the fixing device 1 is a fixing hole 12. One end of the drive shaft 3 is inserted into the fixing hole 12. The top of the fixing device 1 is connected to the bottom of the mechanical seal retaining ring 32. One end of the mechanical seal retaining ring 32 is connected to the outer surface of the mechanical seal device 31. The inner surface of the mechanical seal device 31 is connected to the outer surface of the mechanical seal bushing 33. The inner surface of the mechanical seal bushing 33 is connected to the outer surface of the drive shaft 3.

[0034] The fixing device 1 includes a base 13, a rolling bearing 14 and a bearing bushing 15. A stud hole 11 is provided on the top edge of the base 13. The inner surface of the base 13 is connected to the outer surface of the rolling bearing 14. The inner surface of the rolling bearing 14 is connected to the outer surface of the bearing bushing 15. The middle part of the bearing bushing 15 is a fixing hole 12.

[0035] The double-ended stud 23 is fitted with a pressing nut 231 on one end outside the pressing hole 213, and the drive shaft 3 is fitted with a round nut 34 on one end outside the fixing hole 12.

[0036] A method for using an auxiliary installation device for a mechanical seal, the method comprising the following steps: Step 1: First insert one end of the drive shaft 3 into the fixing hole 12, and then fix the drive shaft 3; Step 2: First connect the outer surface of the drive shaft 3 to the inner surface of the mechanical seal bushing 33, then connect the outer surface of the mechanical seal device 31 to the mechanical seal retaining ring 32, and then insert the double-ended studs 23 into the stud holes 11 in sequence. Step 3: First, fit the pressure plate hole 211 of the pressure plate 21 onto the end of the drive shaft 3 away from the fixed device 1. At the same time, insert the double-ended stud 23 into the lower pressure hole 213. Then, move the pressure plate 21 along the axis of the drive shaft 3 towards the fixed device 1 until the top of the pressure plate 21 connects with the top of the mechanical seal device 31. Then, screw the clamping screw 22 into the clamping hole 212 to fix the mechanical seal device 31 to the pressure plate 21. Then, move the pressure plate 21 downward to compress the mechanical seal device 31 from the free height 311 to the minimum height 312. Then, limit the mechanical seal device 31 outside the pressure plate hole 211. Then, screw the clamping screw 22 out of the clamping hole 212 to release the fixation between the mechanical seal device 31 and the pressure plate 21. Then, move the pressure plate 21 away from the fixed device 1. At the same time, the mechanical seal device 31 springs back, thus completing the initial installation process of the mechanical seal device 31. Step 4: Perform a pump pressure test on the mechanical seal device 31. Once the pump pressure test is passed, the installation of the mechanical seal device 31 is complete.

[0037] In the fourth step, the pump pressure test includes both static pump pressure test and dynamic pump pressure test.

[0038] In the fourth step, the static pump pressure test is performed by first installing a sealing seat 4 on the top of the mechanical seal retaining ring 32, then installing a pressure cap 5 on the top of the sealing seat 4, then installing a transmission shaft sleeve 51 between the pressure cap 5 and the transmission shaft 3, then fixing the transmission shaft sleeve 51, then moving the pressure cap 5 downward to compress the mechanical seal device 31 to a static height 313, and then pumping pressure into the sealing seat 4 from the pumping port 41 to perform the static pump pressure test.

[0039] In the fourth step, a top sealing ring 42 is provided on the top of the sealing seat 4, a bottom sealing ring 43 is provided on the bottom of the sealing seat 4, and a lip seal 52 is provided on the end of the pressure cover 5 near the transmission shaft sleeve 51.

[0040] In the fourth step, the static height 313 is between 55.5 mm and 56.5 mm.

[0041] In the fourth step, the dynamic pump pressure test involves first adjusting the position of the pressure cap 5 so that the distance between the mechanical seal bushing 33 and the mechanical seal retaining ring 32 is the test distance 321, and then rotating the drive shaft 3 to perform the dynamic pump pressure test.

[0042] In the fourth step, the test spacing 321 is 1.8 to 2.2 millimeters.

[0043] The following are supplementary descriptions of the present invention: The mechanical seal device 31 described in this invention refers to: a device for sealing the drive shaft 3 to prevent liquid in the flow channel from contacting the drive shaft 3; the mechanical seal device 31 is externally fitted with a mechanical seal bushing 33, which protects the mechanical seal device 31 and ensures the reliability and stability of the seal; the mechanical seal bushing 33 is externally fitted with a mechanical seal retaining ring 32, which is used to limit and protect the mechanical seal bushing 33 and the mechanical seal device 31, and improve the operational stability of both.

[0044] Example 1: Please see Figure 1 — Figure 11 An auxiliary installation device for a mechanical seal device is disclosed. The device includes a fixing device 1 and an assembly device 2. The assembly device 2 includes a pressure plate 21 and clamping screws 22. The pressure plate 21 has a pressure plate hole 211 in the middle, into which the middle part of a drive shaft 3 is inserted. The pressure plate 21 moves along the axis of the drive shaft 3. The bottom of the pressure plate 21 is connected to the top of the mechanical seal device 31. A clamping hole 212 is provided on the side wall of the pressure plate 21, into which a clamping screw 22 is inserted. Multiple pressing holes are evenly distributed along the edge of the pressure plate 21. 213, one end of a double-ended stud 23 is inserted into the pressing hole 213; the other end of the double-ended stud 23 is inserted into the stud hole 11 of the fixing device 1, the middle part of the fixing device 1 is a fixing hole 12, one end of the drive shaft 3 is inserted into the fixing hole 12, the top of the fixing device 1 is connected to the bottom of the mechanical seal retaining ring 32, one end of the mechanical seal retaining ring 32 is connected to the outer surface of the mechanical seal device 31, the inner surface of the mechanical seal device 31 is connected to the outer surface of the mechanical seal bushing 33, and the inner surface of the mechanical seal bushing 33 is connected to the outer surface of the drive shaft 3.

[0045] A method for using an auxiliary installation device for a mechanical seal, the method comprising the following steps: Step 1: First insert one end of the drive shaft 3 into the fixing hole 12, and then fix the drive shaft 3; Step 2: First connect the outer surface of the drive shaft 3 to the inner surface of the mechanical seal bushing 33, then connect the outer surface of the mechanical seal device 31 to the mechanical seal retaining ring 32, and then insert the double-ended studs 23 into the stud holes 11 in sequence. Step 3: First, fit the pressure plate hole 211 of the pressure plate 21 onto the end of the drive shaft 3 away from the fixed device 1. At the same time, insert the double-ended stud 23 into the lower pressure hole 213. Then, move the pressure plate 21 along the axis of the drive shaft 3 towards the fixed device 1 until the top of the pressure plate 21 connects with the top of the mechanical seal device 31. Then, screw the clamping screw 22 into the clamping hole 212 to fix the mechanical seal device 31 to the pressure plate 21. Then, move the pressure plate 21 downward to compress the mechanical seal device 31 from the free height 311 to the minimum height 312. Then, limit the mechanical seal device 31 outside the pressure plate hole 211. Then, screw the clamping screw 22 out of the clamping hole 212 to release the fixation between the mechanical seal device 31 and the pressure plate 21. Then, move the pressure plate 21 away from the fixed device 1. At the same time, the mechanical seal device 31 springs back, thus completing the initial installation process of the mechanical seal device 31. Step 4: Perform a pump pressure test on the mechanical seal device 31. Once the pump pressure test is passed, the installation of the mechanical seal device 31 is complete.

[0046] Preferably, in the third step, the minimum height 312 is 51.5 to 52.5 millimeters.

[0047] Preferably, in the third step, the minimum height 312 is fifty-two millimeters.

[0048] Preferably, in the third step, limiting the mechanical seal device 31 outside the pressure plate hole 211 means installing a split ring at the split ring installation position 35 to limit the mechanical seal device 31.

[0049] Example 2: The basic content is the same as in Example 1, except that: Please see Figure 1 — Figure 5 The fixing device 1 includes a base 13, a rolling bearing 14, and a bearing bushing 15. A stud hole 11 is provided on the top edge of the base 13. The inner surface of the base 13 is connected to the outer surface of the rolling bearing 14, and the inner surface of the rolling bearing 14 is connected to the outer surface of the bearing bushing 15. A fixing hole 12 is located in the middle of the bearing bushing 15. A pressing nut 231 is fitted onto the end of the double-ended stud 23 located outside the pressing hole 213, and a round nut 34 is fitted onto the end of the drive shaft 3 located outside the fixing hole 12.

[0050] In application, first connect the inner surface of the rolling bearing 14 to the outer surface of the bearing bushing 15, then connect the outer surface of the rolling bearing 14 to the inner surface of the base 13. Next, insert one end of the drive shaft 3 into the fixing hole 12 in the middle of the bearing bushing 15, and then screw a round nut 34 onto the end of the drive shaft 3 located outside the fixing hole 12. This completes the connection between the drive shaft 3 and the fixing device. The bearing bushing 15 protects the drive shaft 3, preventing damage to its outer surface. Because the drive shaft 3 drives the bearing bushing 15 to rotate during operation, a rolling bearing 14 is used to connect the bearing bushing 15 and the base 13. When it is necessary to move the pressure plate 21 downwards, first, ensure all the double-ended studs 23 are located in the lower pressure hole 2... Simultaneously, the pressing nut 231 on one end of the mechanical seal 31 is turned, and all the pressing nuts 231 drive the pressure plate 21 to move downward. Then, the pressure plate 21 moves downward to compress the mechanical seal 31 from the free height 311 to the minimum height 312. In this process, when the pressing nut 231 is turned, the pressure plate 21 moves downward stably, and the pressing nut 231 also limits the pressure plate 21 to prevent it from moving upward under the elastic force of the mechanical seal 31. When the pressing nut 231 is turned, the position of the pressing nut 231 can be finely adjusted, thereby achieving the effect of finely adjusting the position of the pressure plate 21. Therefore, the compression effect of the mechanical seal 31 can be finely adjusted.

[0051] Example 3: The basic content is the same as in Example 1, except that: Please see Figure 1 — Figure 10 In the fourth step, the pump pressure test includes both static and dynamic pump pressure tests. In the static pump pressure test, the sealing seat 4 is first installed on top of the mechanical seal retaining ring 32, then a pressure cap 5 is installed on top of the sealing seat 4, followed by a drive shaft sleeve 51 between the pressure cap 5 and the drive shaft 3. The drive shaft sleeve 51 is then fixed, and the pressure cap 5 is moved downwards to compress the mechanical seal device 31 to a static height 313. Pump pressure is then applied from the pump port 41 of the sealing seat 4 to its interior to perform the static pump pressure test. In the fourth step, a top sealing ring 42 is provided on the top of the sealing seat 4, a bottom sealing ring 43 is provided on the bottom of the sealing seat 4, and a lip seal 52 is provided at the end of the pressure cap 5 near the drive shaft sleeve 51. In the fourth step, the static height 313 is between 55.5 mm and 56.5 mm. Preferably, the static height in the fourth step is 56 mm.

[0052] In application, first install the sealing seat 4 on top of the mechanical seal retaining ring 32, then install the pressure cap 5 on top of the sealing seat 4, and then install the drive shaft sleeve 51 between the pressure cap 5 and the drive shaft 3, so that the inner surface of the drive shaft sleeve 51 is connected to the outer surface of the drive shaft 3. Then screw the lower pressure nut 231 into the end of the double-ended stud 23 located outside the pressure cap 5, then turn all the lower pressure nuts 231, and then the lower pressure nuts 231 move downward to drive the pressure cap 5 to move downward. Then the pressure cap 5 moves downward to compress the mechanical seal device 31 to the static height 31. 3. Then, pump pressure is applied from the pump port 41 of the sealing seat 4 to its interior to perform a static pump pressure test. If the mechanical seal device 31 has good sealing performance, it passes the static pump pressure test. In the aforementioned process, the bottom sealing ring 43 seals the end face between the sealing seat 4 and the mechanical seal retaining ring 32, the top sealing ring 42 seals the end face between the sealing seat 4 and the gland 5, and the tooling sealing ring 53 and the cover O-ring seal the end face where the gland 5 connects to the drive shaft sleeve 51. Thus, a sealing environment that meets the requirements of the static pump pressure test is achieved, so as to realize the static pump pressure test of the mechanical seal device 31.

[0053] Example 4: The basic content is the same as in Example 1, except that: Please see Figure 1 — Figure 11 In the fourth step, the dynamic pump pressure test involves first adjusting the position of the pressure cap 5 so that the distance between the mechanical seal bushing 33 and the mechanical seal retaining ring 32 is the test distance 321, and then rotating the drive shaft 3 to perform the dynamic pump pressure test. In the fourth step, the test distance 321 is 1.8 to 2.2 millimeters. Preferably, in the fourth step, the test distance 321 is 2 millimeters.

[0054] In application, first tighten all the lower nuts 231 to move them upward. At this time, a gap appears between the lower nuts 231 and the cover 5, so the cover 5 can move upward. Then the cover 5 drives the sealing seat 4 to move upward, and then the sealing seat 4 drives the mechanical seal retaining ring 32 to move upward. Therefore, a gap appears between the mechanical seal bushing 33 and the mechanical seal retaining ring 32. Adjust the gap between the mechanical seal bushing 33 and the mechanical seal retaining ring 32 until the gap is the test gap 321. The test gap 321 provides rotation space for the drive shaft 3 and the mechanical seal bushing 33. Then make the drive shaft 3 drive the mechanical seal bushing 33 to rotate simultaneously to perform dynamic pump pressure test of the mechanical seal device 31.

[0055] The above description is only a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. Any equivalent modifications or changes made by those skilled in the art based on the content disclosed in the present invention should be included within the scope of protection set forth in the claims.

Claims

1. An auxiliary installation device for a mechanical seal, characterized in that: The device includes a fixing device (1) and an assembly device (2); The assembly device (2) includes a pressure plate (21) and a clamping screw (22). The middle part of the pressure plate (21) is a pressure plate hole (211). The middle part of the transmission shaft (3) is inserted into the pressure plate hole (211). The movement stroke of the pressure plate (21) is along the axis of the transmission shaft (3). The bottom of the pressure plate (21) is connected to the top of the mechanical seal device (31). A clamping hole (212) is provided on the side wall of the pressure plate (21). A clamping screw (22) is inserted into the clamping hole (212). A plurality of downward pressure holes (213) are evenly distributed on the edge of the pressure plate (21). One end of a double-headed stud (23) is inserted into the downward pressure hole (213). The other end of the double-ended stud (23) is inserted into the stud hole (11) of the fixing device (1). The middle part of the fixing device (1) is a fixing hole (12). One end of the drive shaft (3) is inserted into the fixing hole (12). The top of the fixing device (1) is connected to the bottom of the mechanical seal retaining ring (32). One end of the mechanical seal retaining ring (32) is connected to the outer surface of the mechanical seal device (31). The inner surface of the mechanical seal device (31) is connected to the outer surface of the mechanical seal bushing (33). The inner surface of the mechanical seal bushing (33) is connected to the outer surface of the drive shaft (3).

2. The auxiliary installation device for a mechanical seal according to claim 1, characterized in that: The fixing device (1) includes a base (13), a rolling bearing (14) and a bearing bushing (15). A stud hole (11) is provided on the top edge of the base (13). The inner surface of the base (13) is connected to the outer surface of the rolling bearing (14). The inner surface of the rolling bearing (14) is connected to the outer surface of the bearing bushing (15). The middle part of the bearing bushing (15) is a fixing hole (12).

3. The auxiliary installation device for a mechanical seal according to claim 2, characterized in that: The double-ended stud (23) is fitted with a pressing nut (231) at one end outside the pressing hole (213), and the drive shaft (3) is fitted with a round nut (34) at one end outside the fixing hole (12).

4. A method of using the auxiliary installation device for the mechanical seal device according to claim 1, characterized in that: The method includes the following steps: Step 1: First insert one end of the drive shaft (3) into the fixing hole (12), and then fix the drive shaft (3). Step 2: First connect the outer surface of the drive shaft (3) to the inner surface of the mechanical seal bushing (33), then connect the outer surface of the mechanical seal device (31) to the mechanical seal retaining ring (32), and then insert the double-ended studs (23) into the stud holes (11) in sequence. Step 3: First, fit the pressure plate hole (211) of the pressure plate (21) onto the end of the drive shaft (3) away from the fixed device (1). At the same time, insert the double-ended stud (23) into the lower pressure hole (213). Then, move the pressure plate (21) along the axis of the drive shaft (3) towards the fixed device (1) until the top of the pressure plate (21) is connected to the top of the mechanical seal device (31). Then, screw the clamping screw (22) into the clamping hole (212) to fix the mechanical seal device (31) and the pressure plate (21). Then, move the pressure plate (21) into the clamping hole (212) to fix the mechanical seal device (31) and the pressure plate (21). 1) Move downward to compress the mechanical seal device (31) from the free height (311) to the minimum height (312), then limit the mechanical seal device (31) outside the pressure plate hole (211), then unscrew the clamping screw (22) from the clamping hole (212) to release the mechanical seal device (31) from the pressure plate (21), then move the pressure plate (21) away from the fixing device (1), and at the same time, the mechanical seal device (31) rebounds, thus completing the initial installation process of the mechanical seal device (31); Step 4: Perform a pump pressure test on the mechanical seal device (31). The installation of the mechanical seal device (31) is completed when the pump pressure test is passed.

5. The method of using the auxiliary installation device for a mechanical seal according to claim 4, characterized in that: In the fourth step, the pump pressure test includes both static pump pressure test and dynamic pump pressure test.

6. The method of using the auxiliary installation device for a mechanical seal according to claim 5, characterized in that: In the fourth step, the static pump pressure test is performed by first installing a sealing seat (4) on the top of the mechanical seal retaining ring (32), then installing a pressure cap (5) on the top of the sealing seat (4), then installing a transmission shaft sleeve (51) between the pressure cap (5) and the transmission shaft (3), then fixing the transmission shaft sleeve (51), then moving the pressure cap (5) downward to compress the mechanical seal device (31) to a static height (313), and then pumping pressure from the pumping port (41) of the sealing seat (4) into its interior to perform the static pump pressure test.

7. The method of using the auxiliary installation device for a mechanical seal according to claim 6, characterized in that: In the fourth step, a top sealing ring (42) is provided on the top of the sealing seat (4), a bottom sealing ring (43) is provided on the bottom of the sealing seat (4), and a lip seal (52) is provided on the end of the pressure cap (5) near the transmission shaft sleeve (51).

8. The method of using the auxiliary installation device for a mechanical seal according to claim 7, characterized in that: In the fourth step, the static height (313) is 55.5 mm to 56.5 mm.

9. The method of using the auxiliary installation device for a mechanical seal according to claim 5, characterized in that: In the fourth step, the dynamic pump pressure test is to first adjust the position of the pressure cap (5) so that the distance between the mechanical seal bushing (33) and the mechanical seal retaining ring (32) is the test distance (321), and then rotate the drive shaft (3) to perform the dynamic pump pressure test.

10. The method of using the auxiliary installation device for a mechanical seal according to claim 9, characterized in that: In the fourth step, the test interval (321) is 1.8 to 2.2 millimeters.

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