Mechanical seal static ring mounting tool for pump

Abstract

A mechanical seal static ring installation tool for a pump is arranged on the outer side of a main shaft, the middle of the main shaft is sleeved with a pump cover, the front portion of the main shaft is provided with a shaft head thread part, an impeller installation part and a mechanical seal installation part, the outer side of the mechanical seal installation part is sleeved with a static ring, the installation tool comprises a locking nut, an end cover, a sleeve and a press-in sleeve, and the press-in sleeve is connected to the outer side of the mechanical seal installation part in a sleeved mode. The static ring is embedded into the L-shaped pad and is in close fit with the inner wall of the L-shaped pad, the outer side of the L-shaped pad is in close fit with a mechanical seal static ring cavity of the inner circle of the pump cover, the locking nut is connected to the outer side of a shaft head thread part in a sleeving mode, the end cover surrounds the inner side of a locking nut body, a screw head of the locking nut tightly presses the front end of the end cover, and the sleeve is clamped between the end cover and the press-in sleeve. The assembling body of the press-in sleeve, the sleeve and the end cover is designed, the static ring wrapping the L-shaped pad can be stably pushed into a mechanical seal static ring cavity through the nut, and the potential quality hazards that press-in is uneven, the L-shaped pad is damaged in the press-fitting process, and the surface of the static ring is damaged are eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of pump mechanical seals, in particular to a static ring installation tool for a pump mechanical seal. Background Art

[0002] The existing sewage pump generally uses the MG1 series mechanical seal, and the stationary ring is usually installed with the G60 type made of silicon carbide. The stationary ring is covered with an L-shaped gasket made of rubber. In order to prevent the stationary ring from slipping in the cavity after being pushed into the static ring cavity of the machine seal, the stationary ring is covered with the L-shaped gasket and has an interference fit of 50 wires relative to the static ring cavity of the machine seal. The L-shaped gasket is made of soft rubber. A flat-blade screwdriver is often used to pry the L-shaped gasket around to deform the rubber. The stationary ring is then embedded in the static ring cavity of the machine seal as the L-shaped gasket deforms.

[0003] Due to the different levels of proficiency of the workers, it is easy to pry onto the surface of the static ring during the prying process, causing damage to the static ring or breaking the L-shaped pad. Even if it is installed in place, there may be flanged edges of the L-shaped pad or uneven installation of the static ring end face, posing quality risks. A special tooling is urgently needed to solve the installation problem of the static ring of the machine seal and eliminate the above-mentioned quality risks. Summary of the invention

[0004] The utility model aims to provide a pump mechanical seal static ring installation tool.

[0005] In order to achieve the above purpose, the technical solution of the utility model is:

[0006] A pump mechanical seal static ring installation tool, the installation tool is arranged on the outside of the main shaft, the middle part of the main shaft is sleeved with a pump cover, the front part of the main shaft is provided with a shaft head threaded part, an impeller installation part and a mechanical seal installation part from front to back, the outer side of the mechanical seal installation part is sleeved with a static ring, characterized in that:

[0007] The installation tool includes a locking nut, an end cover, a sleeve, and a press-in sleeve. The press-in sleeve is sleeved on the outer side of the machine seal installation part, the rear end of the press-in sleeve is fitted with the front end of the static ring, the static ring is embedded in the L-shaped gasket and tightly matched with the inner wall of the L-shaped gasket, the outer side of the L-shaped gasket is tightly matched with the machine seal static ring cavity of the inner circle of the pump cover, the locking nut is sleeved on the outer side of the threaded part of the shaft head, the end cover is surrounded by the inner side of the locking nut screw body, the screw head of the locking nut presses the front end of the end cover, the sleeve is clamped between the end cover and the press-in sleeve, and the nut is tightened to clamp the end cover, sleeve and press-in sleeve.

[0008] Furthermore, the rear end of the end cover is radially recessed with an end cover stop, the front end of the press-in sleeve is radially recessed with a press-in sleeve stop, and the front and rear ends of the sleeve are respectively fitted with the end cover stop and the press-in sleeve stop.

[0009] Furthermore, the inner wall at the rear end of the sleeve protrudes inwardly and is provided with a first stop, and the inner wall at the front end of the sleeve protrudes inwardly and is provided with a second stop, and the first stop and the second stop are both annular step structures, and the first stop and the second stop respectively cooperate with the end cover stop and the press-in sleeve stop.

[0010] The utility model designs an assembly of a press-in sleeve, a sleeve and an end cover, and a nut can be used to steadily push a static ring covered with an L-shaped gasket into a static ring cavity of a machine seal, thereby eliminating quality risks such as uneven pressing, damage to the L-shaped gasket and damage to the static ring surface during the pressing process; the press-in sleeve, the sleeve and the end cover cooperate with each other through their stoppers, and the assembly structure is convenient for pressing and installing static rings of the same type of machine seals. When the threaded portion of the main shaft head is inconsistent or the length of the impeller mounting portion is inconsistent, the sleeve, the end cover or the nut can be replaced to complete the press-fitting of the static ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the main shaft and the pump cover;

[0012] Figure 2 It is a schematic diagram of the overall structure of the utility model;

[0013] Figure 3 It is a structural schematic diagram of the end cover of the utility model;

[0014] Figure 4 It is a structural schematic diagram of the sleeve of the utility model;

[0015] Figure 5 It is a structural schematic diagram of the press-in sleeve of the utility model.

[0016] Reference numerals:

[0017] 1 main shaft, 101 mechanical seal installation part, 102 impeller installation part, 103 shaft head thread part,

[0018] 2 pump cover, 201 mechanical seal static ring cavity,

[0019] 3 Locking nut

[0020] 4 end caps, 401 end cap stopper, 402 end cap through-shaft hole,

[0021] 5 sleeve, 501 first stop, 502 sleeve through-shaft hole, 503 second stop,

[0022] 6 press-in sleeve, 601 press-in sleeve stopper, 602 press-in sleeve through shaft hole,

[0023] 7. Stationary ring, 8. L-shaped pad. DETAILED DESCRIPTION

[0024] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] The utility model discloses a pump mechanical seal static ring installation tool, the installation tool is arranged on the outside of the main shaft 1, the middle part of the main shaft 1 is sleeved with a pump cover 2, such as Figure 1 As shown, the front part of the main shaft 1 is provided with a shaft head threaded portion 103, an impeller mounting portion 102 and a mechanical seal mounting portion 101 in sequence from front to back, and the outer side of the mechanical seal mounting portion 101 is sleeved with a static ring 7 and an L-shaped gasket 8.

[0026] like Figure 2 As shown, the installation tool includes a locking nut 3, an end cover 4, a sleeve 5, and a press-in sleeve 6. The press-in sleeve 6 is sleeved on the outer side of the machine seal mounting portion 101, and the rear end of the press-in sleeve 6 fits with the front end of the static ring 7. The static ring 7 is embedded in the L-shaped gasket 8 and fits tightly with the inner wall of the L-shaped gasket 8. The outer side of the L-shaped gasket 8 fits tightly with the machine seal static ring cavity 201 of the inner circle of the pump cover 2. The locking nut 3 is sleeved on the outer side of the shaft head threaded portion 103, and the end cover 4 surrounds the inner side of the locking nut 3. The locking nut 3 presses the front end of the end cover 4, and the sleeve 5 is clamped between the end cover 4 and the press-in sleeve 6. The nut 3 is tightened to clamp the end cover 4, the sleeve 5 and the press-in sleeve 6.

[0027] like Figure 3 and Figure 5 As shown, the rear end of the end cover 4 is radially recessed with an end cover stop 401, the front end of the press-in sleeve 6 is radially recessed with a press-in sleeve stop 601, and the front and rear ends of the sleeve 5 are respectively fitted with the end cover stop 401 and the press-in sleeve stop 601.

[0028] like Figure 4 and Figure 5 As shown, the inner wall at the rear end of the sleeve 5 protrudes inwardly and is provided with a first stop 501, and the inner wall at the front end of the sleeve 5 protrudes inwardly and is provided with a second stop 503. The first stop 501 and the second stop 503 are both annular step structures, and the first stop 501 and the second stop 503 respectively cooperate with the end cover stop 401 and the press-in sleeve stop 601.

[0029] In the installation tool of the utility model, the diameter of the end cover through the shaft hole 402 is larger than the diameter of the shaft head threaded portion 103, the diameter of the sleeve through the shaft hole 502 is larger than the diameter of the impeller mounting portion 102, the diameter of the press-fit sleeve through the shaft hole 602 is consistent with the diameter of the static ring 7, and the diameter of the press-fit sleeve through the shaft hole 602 is 0.5 mm larger than the diameter of the machine seal mounting portion 101.

[0030] The installation process of the utility model installation tool is as follows:

[0031] Step 1) Sleeve the first stop 501 of the sleeve 5 onto the stop 601 of the press-in sleeve until the rear end of the sleeve 5 abuts against the stop 601 of the press-in sleeve;

[0032] Step 2) inserting the end cover stopper 401 into the second stopper 503 of the sleeve 5 until the axial end surface of the end cover stopper 401 abuts against the front end of the sleeve 5;

[0033] Step 3) Push the stationary ring 7 covered with the L-shaped gasket 8 into the mechanical seal stationary ring cavity 201, and insert the assembled press-in sleeve 6, sleeve 5 and end cover 4 assembly until it abuts against the front end surface of the stationary ring 7;

[0034] Step 4) Screw the locking nut 3 into the shaft head thread 103 until the locking nut 3 is flush with the front end surface of the end cover 4. Use a wrench to slowly tighten the locking nut 3 until the static ring 7 covering the L-shaped gasket 8 is in contact with the bottom surface of the mechanical seal static ring cavity 201.

[0035] In step 3, the press-in sleeve 6, sleeve 5 and end cover 4 are designed to be an assembly, which is convenient for pressing the same type of machine seal static ring 7. When the size of the main shaft 1 shaft head threaded portion 103 is inconsistent or the length of the impeller mounting portion 102 is inconsistent, the sleeve 5, end cover 4 or locking nut 3 is replaced to match the corresponding part of the main shaft 1 to complete the press-fitting of the static ring 7 again.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A pump mechanical seal static ring installation tool, the installation tool is arranged on the outside of the main shaft, the middle part of the main shaft is sleeved with the pump cover, the front part of the main shaft is provided with a shaft head threaded part, an impeller mounting part and a mechanical seal mounting part from front to back, the outer side of the mechanical seal mounting part is sleeved with the static ring, characterized in that: The installation tool includes a locking nut, an end cover, a sleeve, and a press-in sleeve. The press-in sleeve is sleeved on the outer side of the machine seal installation part, the rear end of the press-in sleeve is fitted with the front end of the static ring, the static ring is embedded in the L-shaped gasket and tightly matched with the inner wall of the L-shaped gasket, the outer side of the L-shaped gasket is tightly matched with the machine seal static ring cavity of the inner circle of the pump cover, the locking nut is sleeved on the outer side of the threaded part of the shaft head, the end cover is surrounded by the inner side of the locking nut screw body, the screw head of the locking nut presses the front end of the end cover, the sleeve is clamped between the end cover and the press-in sleeve, and the nut is tightened to clamp the end cover, sleeve and press-in sleeve.

2. The pump mechanical seal static ring installation tool according to claim 1 is characterized in that: The rear end of the end cover is radially recessed to provide an end cover stop, the front end of the press-in sleeve is radially recessed to provide a press-in sleeve stop, and the front and rear ends of the sleeve are respectively fitted with the end cover stop and the press-in sleeve stop.

3. The pump mechanical seal static ring installation tool according to claim 2 is characterized in that: The inner wall at the rear end of the sleeve protrudes inwardly and is provided with a first stop, and the inner wall at the front end of the sleeve protrudes inwardly and is provided with a second stop. The first stop and the second stop are both annular step structures, and the first stop and the second stop respectively cooperate with the end cover stop and the press-in sleeve stop.

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