A mechanical seal installation method

Abstract

The present invention discloses a mechanical seal installation method, comprising the following operating steps: step A: cleaning a stationary ring seat, and placing an anti-rotation pin into the pressure reducing cover and the stationary ring seat pin hole respectively; step B: checking whether the sealing component has quality problems and defects; step C: installing the sealing component; step D: performing a static pressure test after the sealing component is installed; step E: installing the entire machine; wherein there are certain requirements for the installation sequence and installation method during the installation process, for example, when installing and disassembling the mechanical seal, care must be taken, and it is strictly forbidden to use a hand hammer and a flat shovel to avoid damaging the sealing component; the present invention effectively solves the problem that the mechanical seal of a slurry pump is not tight and affects the service life, and provides a mechanical seal installation method with good sealing performance after sealing, which can extend the operating time and increase the service life.

Description

Technical Field

[0001] The present invention relates to the field of mechanical seals, and in particular to a mechanical seal installation method. Background Art

[0002] A slurry pump is a machine that increases the energy of a solid-liquid mixture by using centrifugal force (the rotation of the pump's impeller), converting electrical energy into kinetic and potential energy of the medium. It is primarily used in industries such as mining, power plants, dredging, metallurgy, chemicals, building materials, and petroleum.

[0003] A mechanical seal is a device that prevents fluid leakage by means of at least one pair of end faces perpendicular to the axis of rotation, which are kept in contact and slide relative to each other under the action of fluid pressure and the elastic force (or magnetic force) of a compensation mechanism, as well as the cooperation of an auxiliary seal. Mechanical seals have the advantages of low leakage and long service life.

[0004] Among them, most of the existing slurry pumps use mechanical seals for sealing. The installation of mechanical seals has requirements for the environment, installation sequence and force method. If the requirements are not met, the assembled mechanical seal will have a short service life and is prone to leakage. Summary of the Invention

[0005] In order to solve the problem that during the installation of the mechanical seal of the existing slurry pump, the assembled mechanical seal is not tightly sealed and has a short service life due to incorrect operating steps, the present invention provides a mechanical seal installation method.

[0006] The technical solution of the present invention is achieved through the following solution: A mechanical seal installation method, characterized by comprising the following steps:

[0007] Step A: Clean the stationary ring seat and place the anti-rotation pin into the pin hole of the pressure reducing cover and the stationary ring seat respectively;

[0008] Step B: Check the sealing components for quality problems and defects;

[0009] Step C: Install the seal assembly:

[0010] Step D: Perform a static pressure test after the sealing assembly is installed;

[0011] Step E: Install the entire machine.

[0012] Preferably, the sealing assembly includes a stationary ring, a stationary ring O-ring, a dynamic ring, a dynamic ring O-ring and a dynamic ring seat; the stationary ring is sleeved with the stationary ring O-ring, and the dynamic ring O-ring is sleeved with the dynamic ring.

[0013] Preferably, the step B comprises:

[0014] b1: First, check whether the sealing assembly has any bumps or cracks, whether the contact surfaces of the static ring and the dynamic ring have any scratches, and whether the two static rings are the same size;

[0015] b2: Place the static ring on the static ring seat to check the looseness of the static ring and the fit between the static ring and the anti-rotation pin. If the length of the anti-rotation pin is not suitable, replace it in time. If there is no problem, continue to install.

[0016] Preferably, the step C comprises:

[0017] c1: Apply an appropriate amount of clean grease around the O-ring of the static ring, put the O-ring of the static ring on the static ring, and press the two static rings into the corresponding stops of the pressure reducing cover and the static ring seat respectively;

[0018] c2: Apply an appropriate amount of clean grease around the rotating ring O-ring, and put the rotating ring O-ring on the rotating ring;

[0019] c3: Put the dynamic ring seat into the appropriate position of the sealing sleeve, align one of the four fastening screws on the dynamic ring seat with the long flat groove of the sealing sleeve, and do not tighten it. Just make sure that the dynamic ring seat cannot move freely on the sealing sleeve;

[0020] c4: First, clean the contact surfaces of the dynamic ring and the static ring, then apply an appropriate amount of clean engine oil to the contact surface of the static ring. Place the dynamic ring on the static ring on one side of the pressure reducing cover, and then install the sealing sleeve with the dynamic ring seat.

[0021] c5: Rotate the dynamic ring seat and the sealing sleeve to make the oil film on the sealing surface uniform, then cover the static ring seat with the static ring installed, and rotate the static ring seat to make the oil film uniform, then tighten the bolts and screw the screw plug on the pressure reducing cover.

[0022] Preferably, the step D comprises:

[0023] d1: After installation is completed, perform a static pressure test on the fixed workpiece;

[0024] d2: After the static pressure test, check for leaks. If the test is qualified, proceed to the next process and install the whole machine.

[0025] Preferably, in the static pressure test in step d1, the test pressure is 0.2 MPa and the pressure holding time is 30 minutes.

[0026] Preferably, the step E comprises:

[0027] e1: Push the sealing assembly into the pump body hole during installation;

[0028] e2: Install the auxiliary impeller, rear guard plate and impeller, install the impeller on the shaft, and turn it until it cannot be turned further by hand;

[0029] e3: Use a crowbar to clamp the fastening bolts between the cavity between the main blades of the impeller and the pump casing, put the long sleeve on the pump installation wrench, and pre-tighten the impeller;

[0030] e4: Tighten the fastening screws on the mechanical seal and tighten the disassembly ring screws.

[0031] In summary, the present invention has the following beneficial effects:

[0032] 1. The present invention seals the slurry pump through a correct and orderly installation method and a structurally reliable sealing component, so that the sealing state of the slurry pump is very stable during long-term operation, reducing the possibility of leakage to zero, and effectively ensuring the sealing performance. At the same time, the correct installation of the mechanical seal can extend the operating time, increase the service life, and greatly reduce the maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the installation structure of the present invention.

[0034] Explanation of the accompanying reference numerals: 1. Stationary ring seat; 2. Anti-rotation pin; 3. Pressure reducing cover; 4. Sealing assembly; 41. Stationary ring; 42. Stationary ring O-ring; 43. Moving ring; 44. Moving ring O-ring; 45. Moving ring seat; 5. Sealing sleeve. DETAILED DESCRIPTION

[0035] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0036] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments of the specification disclosed below. The present invention is further described in detail below with reference to the accompanying drawings.

[0037] Example 1: A mechanical seal installation method, such as Figure 1 As shown, it is characterized by comprising the following operating steps:

[0038] Step A: Clean the stationary ring seat 1 and insert the anti-rotation pin 2 into the pin holes of the pressure reducing cover 3 and the stationary ring seat respectively;

[0039] Step B: Checking the sealing component 4 for quality problems and defects;

[0040] Step C: Install the seal assembly 4:

[0041] Step D: After the sealing assembly 4 is installed, a static pressure test is performed;

[0042] Step E: Install the entire machine.

[0043] The sealing assembly 4 includes a stationary ring 41 , a stationary ring O-ring 42 , a dynamic ring 43 , a dynamic ring O-ring 44 and a dynamic ring seat 45 . The stationary ring 41 is sleeved with the stationary ring O-ring 42 , and the dynamic ring 43 is sleeved with the dynamic ring O-ring 44 .

[0044] More specifically, step B includes:

[0045] b1: First, check whether the sealing assembly 4 has any bumps or cracks, whether the contact surfaces of the static ring 41 and the dynamic ring 43 have any scratches, and whether the two static rings 41 are the same size;

[0046] b2: Place the stationary ring 41 on the stationary ring seat 1 without placing the stationary ring O-ring 42 to check the looseness of the stationary ring 41 and the fit between the stationary ring 41 and the anti-rotation pin 2. If the length of the anti-rotation pin 2 is not suitable, replace it in time. If there is no problem, continue to install.

[0047] Step C includes:

[0048] c1: Apply an appropriate amount of clean grease around the static ring O-ring 42, put the static ring O-ring 42 on the static ring 41, and press the two static rings 41 into the corresponding stops of the pressure reducing cover 3 and the static ring seat 1 respectively;

[0049] c2: Apply an appropriate amount of clean grease around the rotating ring O-ring 44, and put the rotating ring O-ring 44 on the rotating ring 43;

[0050] c3: Put the dynamic ring seat 45 into the appropriate position of the sealing sleeve 5, align one of the four fastening screws on the dynamic ring seat 45 with the long flat groove of the sealing sleeve 5, and do not tighten it. Just make sure that the dynamic ring seat 45 cannot move freely on the sealing sleeve 5;

[0051] c4: First, clean the contact surfaces of the dynamic ring 43 and the static ring 41. Then, apply an appropriate amount of clean engine oil to the contact surface of the static ring 41. Place the dynamic ring 43 on the static ring 41 on one side of the pressure reducing cover 3. Then, install the sealing sleeve 5 with the dynamic ring seat 45.

[0052] c5: Rotate the dynamic ring seat 45 and the sealing sleeve 5 to make the oil film on the sealing surface uniform, then cover the static ring seat 1 with the static ring 41 installed, and rotate the static ring seat 1 to make the oil film uniform, then tighten the bolts and screw the screw plug on the pressure reducing cover 3.

[0053] Step D includes:

[0054] d1: After installation is completed, perform a static pressure test on the fixed workpiece;

[0055] d2: After the static pressure test, check for leaks. If the test is qualified, proceed to the next step and install the whole machine.

[0056] In the static pressure test in step d1, the test pressure is 0.2 MPa and the pressure holding time is 30 minutes.

[0057] Step E includes:

[0058] e1: Push the sealing assembly 4 into the pump body hole during installation;

[0059] e2: Install the auxiliary impeller, rear guard plate and impeller, install the impeller on the shaft, and turn it until it cannot be turned further by hand;

[0060] e3: Use a crowbar to clamp the fastening bolts between the cavity between the main blades of the impeller and the pump casing, put the long sleeve on the pump installation wrench, and pre-tighten the impeller. During the pre-tightening process, it is not allowed to hit with a hammer, knock with a lever, or apply force suddenly;

[0061] e4: Tighten the fastening screws on the mechanical seal and tighten the disassembly ring screws.

[0062] At this point, the installation of a mechanical seal is completed. The correct and orderly installation method can effectively improve the sealing performance of the mechanical seal and limit the leakage to zero. No adjustment is required during operation, the shaft or sleeve is not subject to wear and friction, and power consumption is low. Correct installation can extend the operating time, increase the service life, and greatly reduce the cost of equipment maintenance.

[0063] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any other form. Any person skilled in the art may use the technical contents disclosed above to change or modify them into equivalent embodiments with equivalent changes for application in other fields. However, any simple modification or equivalent change made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A mechanical seal installation method, characterized in that: The steps are as follows: Step A: Clean the stationary ring seat (1) and place the anti-rotation pin (2) into the pin holes of the pressure reducing cover (3) and the stationary ring seat respectively; Step B: Checking whether the sealing assembly (4) has any quality problems or defects; the sealing assembly (4) includes a stationary ring (41), a stationary ring O-ring (42), a dynamic ring (43), a dynamic ring O-ring (44) and a dynamic ring seat (45); the stationary ring (41) is sleeved with the stationary ring O-ring (42), and the dynamic ring (43) is sleeved with the dynamic ring O-ring (44); Step C: Install the sealing assembly (4); Step D: After the sealing assembly (4) is installed, a static pressure test is performed; Step E: Install the whole machine; The step C comprises: c1: applying an appropriate amount of clean grease around the stationary ring O-ring (42), sleeve the stationary ring O-ring (42) onto the stationary ring (41), and press the two stationary rings (41) into the corresponding stoppers of the pressure reducing cover (3) and the stationary ring seat (1); c2: Apply an appropriate amount of clean grease around the rotating ring O-ring (44), and put the rotating ring O-ring (44) on the rotating ring (43); c3: Put the dynamic ring seat (45) into the appropriate position of the sealing sleeve (5), align one of the four fastening screws on the dynamic ring seat (45) with the long flat groove of the sealing sleeve (5), without tightening, just make the dynamic ring seat (45) unable to move freely on the sealing sleeve (5); c4: First, clean the contact surface of the moving ring (43) and the stationary ring (41), and then Apply a proper amount of clean engine oil, place the dynamic ring (43) on the static ring (41) on one side of the pressure reducing cover (3), and then install the sealing sleeve (5) provided with the dynamic ring seat (45); c5: Rotate the dynamic ring seat (45) and the sealing sleeve (5) to make the oil film on the sealing surface uniform, and then cover the seat with the static The stationary ring seat (1) of the ring (41) is rotated to make the oil film uniform, and then the bolts are tightened to screw the screw plug onto the pressure reducing cover (3).

2. A mechanical seal installation method according to claim 1, characterized in that: The step B comprises: b1: First, check whether the sealing assembly (4) has any bumps or cracks, whether the contact surfaces of the static ring (41) and the dynamic ring (43) have any scratches, and whether the two static rings (41) are the same size; b2: Place the stationary ring (41) on the stationary ring seat (1) to check the looseness of the stationary ring (41) and the fit between the stationary ring (41) and the anti-rotation pin (2). If the length of the anti-rotation pin (2) is not appropriate, replace it in time. If there is no problem, continue to install it.

3. A mechanical seal installation method according to claim 1, characterized in that: The step D comprises: d1: After installation is completed, perform a static pressure test on the fixed workpiece; d2: After the static pressure test, check for leaks. If the test is qualified, proceed to the next process and install the whole machine.

4. A mechanical seal installation method according to claim 3, characterized in that: In the static pressure test in step d1, the test pressure is 0.2 MPa and the pressure holding time is 30 minutes.

5. The mechanical seal installation method according to claim 1, characterized in that: The step E comprises: e1: During installation, push the sealing assembly (4) into the pump body hole; e2: Install the auxiliary impeller, rear guard plate and impeller, install the impeller on the shaft, and turn it until it cannot be turned further by hand; e3: Use a crowbar to clamp the fastening bolts between the cavity between the main blades of the impeller and the pump casing, and put the long sleeve on the pump installation. On the wrench, pre-tighten the impeller; e4: Tighten the fastening screws on the mechanical seal and tighten the disassembly ring screws.

Images