CN203516742U - Water-cooling mechanical seal structure for pumps - Google Patents

Abstract

The utility model discloses a pump water-cooled mechanical seal structure capable of making the structure of the pump smaller and more compact and improving the versatility of parts. The utility model comprises a first seal grinding surface and a second seal grinding surface. It includes a shaft sleeve (10) arranged on the right side of the second moving ring (6) and circumferentially linked with the rotating shaft (2), the left end surface of the shaft sleeve (10) abuts against the right end surface of the second moving ring (6), The right end surface of the shaft sleeve (10) abuts against the left end surface of the inner ring (11) of the bearing installed on the rotating shaft (2).

Description

Pump water-cooled mechanical seal structure

technical field

The utility model relates to the technical field of pumps, in particular to a pump water-cooled mechanical seal structure.

Background technique

The existing pump water-cooled mechanical seal structure generally includes a mechanical seal seat, a first moving ring that is circumferentially linked with the rotating shaft, a first static ring and a second static ring arranged on the mechanical seal seat, and a second moving ring that is circumferentially linked with the rotating shaft. Two moving rings, the first moving ring is arranged on the moving ring seat, a number of first elastic parts are arranged between the first moving ring and the moving ring seat along the circumference of the rotating shaft, and one end of each first elastic part is against the moving ring seat, each The other end of the first elastic piece is all against the first moving ring, and a number of second elastic pieces are arranged between the first static ring and the second static ring along the circumference of the rotating shaft, and one end of each second elastic piece is against the first static ring , the other end of each second elastic member is against the second static ring; the moving ring in the above structure rotates with the rotation of the rotating shaft, and the first elastic member and the second elastic member bounce off, the first The right end surface of the moving ring and the left end surface of the first static ring are opposed to form the first sealing grinding surface, and the right end surface of the second stationary ring is opposed to the left end surface of the second moving ring to form the second sealing grinding surface. The grinding surface and the second seal grinding surface realize the sealing between the inside of the pump and the outside world.

The water-cooled mechanical seal structure of the pump has the following disadvantages:

1. In the prior art, a step is generally set on the rotating shaft to abut against the right end face of the second moving ring to achieve axial limit, and the bearing installed from the left end of the rotating shaft also needs another step after it is installed in place The diameter of the step against the bearing is larger than the diameter of the step against the right end surface of the second moving ring, otherwise, the bearing cannot be loaded from the left end of the rotating shaft, so, for mechanical seal and bearing installation, there must be two Steps, and the diameter of the steps against the bearing is relatively large, so the length of the shaft is longer, the diameter of the shaft is larger, and the related parts will also be larger, such as bearings and bearing end covers, which will lead to the structure of the pump becoming larger and insufficient. compact.

2. The pump water-cooled mechanical seal structure and the pump non-water-cooled mechanical seal structure cannot be used in common, such as shafts, bearings, and gear boxes, that is, the parts have poor versatility. Therefore, the pump non-water-cooled mechanical seal structure cannot be simply modified to become a pump. Water-cooled mechanical seal structure.

Utility model content

The technical problem to be solved by the utility model is to provide a pump water-cooled mechanical seal structure which can make the structure of the pump smaller and more compact and improve the versatility of parts.

The technical scheme of the utility model is that the pump water-cooled mechanical seal structure of the utility model includes a mechanical seal seat, a first moving ring which is circumferentially linked with the rotating shaft, a first static ring and a second static ring arranged on the mechanical seal seat. ring, and the second moving ring that is linked with the rotating shaft in the circumferential direction, the first moving ring is arranged on the moving ring seat, and a number of first elastic parts are arranged between the first moving ring and the moving ring seat along the rotating shaft circumferential direction, and each first elastic part One end is against the moving ring seat, and the other end of each first elastic part is against the first moving ring. A number of second elastic parts are arranged between the first static ring and the second static ring along the circumference of the rotating shaft, and each second elastic part One end of each of the second elastic members is in contact with the first static ring, the other end of each second elastic member is in contact with the second static ring, and the right end face of the first moving ring is in contact with the left end face of the first static ring to form the first sealing grinding surface , the right end surface of the second static ring is opposed to the left end surface of the second moving ring to form a second sealing grinding surface, and it also includes a shaft sleeve arranged on the right side of the second moving ring and cooperating with the rotating shaft in the circumferential direction. The left end surface abuts against the right end surface of the second moving ring, and the right end surface of the shaft sleeve abuts against the left end surface of the inner ring of the bearing installed on the rotating shaft.

After adopting the above structure, compared with the prior art, the utility model has the following advantages: because it also includes a shaft sleeve arranged on the right side of the second moving ring and linked with the rotating shaft in the circumferential direction, the left end surface of the shaft sleeve is in contact with the second moving ring. The right end face of the ring abuts against, and the right end face of the shaft sleeve abuts against the left end face of the inner ring of the bearing installed on the rotating shaft. In this way, 1) the step on the rotating shaft used to abut against the right end face of the second moving ring is canceled , which effectively shortens the required length of the rotating shaft. At the same time, the step on the rotating shaft that is used to abut against the right end face of the second moving ring is eliminated and the sleeve can be installed after the rotating shaft is installed. The diameter of the step abutting against the bearing does not need to be Taking care of the installation of the mechanical seal, the diameter of the step against the bearing can be reduced, and correspondingly, the size of the bearing, the bearing end cover and other related parts can also be reduced; The step on the right end surface of the moving ring makes the number of steps of the pump water-cooled mechanical seal structure and the pump non-water-cooled mechanical seal structure the same, so that the pump water-cooled mechanical seal structure and the pump non-water-cooled mechanical seal structure can be used. If the same structure is made, the structure of the bearing and gear box used in the adjusted shaft can also be consistent. The difference between the two is mainly the difference between the mechanical seal seat and the water-cooled mechanical seal structure. The second static ring and the second dynamic Ring, shaft sleeve, so the existing pump non-water-cooled mechanical seal structure can be changed into the water-cooled mechanical seal of the utility model pump through simple modifications such as replacing the mechanical seal seat, adding the second static ring, the second moving ring, and the shaft sleeve. Structure: Based on the above, the utility model has the advantages of making the structure of the pump smaller and more compact, and improving the versatility of parts.

As an improvement, a sealing ring is provided between the shaft sleeve and the rotating shaft, so that the oil in the gear box can be prevented from flowing into the mechanical seal through the gap between the shaft sleeve and the rotating shaft, which is more conducive to the improvement of the performance of the utility model.

Description of drawings

Fig. 1 is a sectional view of the water-cooled mechanical seal structure of the pump of the present invention.

Fig. 2 is a cross-sectional view of the rotor pump using the water-cooled mechanical seal structure of the pump of the present invention.

As shown in the figure, 1. Mechanical seal seat, 2. Rotating shaft, 3. First moving ring, 4. First static ring, 5. Second static ring, 6. Second moving ring, 7. Moving ring seat, 8 , the first elastic piece, 9, the second elastic piece, 10, the shaft sleeve, 11, the inner ring, 12, the sealing ring, 13, the spring seat, 14, the O-ring sealing ring, 15, the skeleton seal, 16, the anti-rotation pin , 17, baffle plate, 18, axial limit retaining ring, 19, bearing end cover, 20, gear box.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described.

The water-cooled mechanical seal structure of the pump of the utility model includes a mechanical seal seat 1, a first moving ring 3 linked with the rotating shaft 2 in the circumferential direction, a first static ring 4 and a second static ring 5 arranged on the mechanical seal seat 1, The second moving ring 6 linked with the rotating shaft 2 in the circumferential direction, the first moving ring 3 is arranged on the moving ring seat 7, and the moving ring seat 7 is linked with the rotating shaft 2 in the circumferential direction, and the first moving ring 3 and the moving ring seat 7 are along the Rotating shaft 2 is provided with several first elastic parts 8 in the circumferential direction, and one end of each first elastic part 8 all abuts against the moving ring seat 7, and the other end of each first elastic part 8 all abuts against the first moving ring 3, and the first static ring 4 Between the second static ring 5 and along the circumference of the rotating shaft 2, several second elastic pieces 9 are arranged, and one end of each second elastic piece 9 is all against the first static ring 4, and the other end of each second elastic piece 9 is all in contact with the second The static ring 5 abuts, the right end surface of the first moving ring 3 and the left end surface of the first static ring 4 abut to form the first sealing grinding surface, the right end surface of the second static ring 5 and the left end of the second moving ring 6 It also includes a shaft sleeve 10 which is located on the right side of the second moving ring 6 and is linked with the rotation shaft 2 in the circumferential direction. The left end surface of the shaft sleeve 10 is against the right end surface of the second moving ring 6. , the right end surface of the shaft sleeve 10 abuts against the left end surface of the inner ring 11 of the bearing installed on the rotating shaft 2; the mechanical seal seat 1 is provided with at least one water inlet hole and at least one water outlet hole through the inner and outer walls.

Between the moving ring seat 7 and the rotating shaft 2, between the first moving ring 3 and the moving ring seat 7, between the first stationary ring 4 and the second stationary ring 5 and the mechanical seal seat 1, between the second moving ring 6 and the rotating shaft 2 O-shaped sealing rings 14 are arranged between them, so that the sealing effect is better and the leakage phenomenon is basically eliminated.

Between the first moving ring 3 and the first static ring 4, between the second static ring 5 and the second moving ring 6, there are axial limit rings 18; between the first moving ring 3 and the first static ring 4 The axial limit retaining ring 18 between them is located on the right part of the moving ring seat 7, which not only facilitates assembly and improves assembly efficiency, but also prevents the first moving ring 3 from falling out of the moving ring seat 7 during transportation; The axial limit retaining ring 18 between the ring 5 and the second moving ring 6 is located on the right part of the mechanical seal seat 1, which not only facilitates assembly and improves assembly efficiency, but also prevents the second static ring 5 from being separated from the mechanical seal during transportation. Fall out of seat 1.

The first moving ring 3 is connected to the right end of the anti-rotation pin 16, the left end of the anti-rotation pin 16 is connected to the moving ring seat 7, and the moving ring seat 7 is connected to the rotor screw of the pump. satisfies the design requirements of the circumferential linkage, that is, the design requirements for the synchronous rotation of the first moving ring 3, the moving ring seat 7 and the rotating shaft 2; the mechanical seal seat 1 is also equipped with an anti-rotation pin 16, and the left end of the anti-rotation pin 16 and The first static ring 4 is connected, and the right end of the anti-rotation pin 16 is connected with the second static ring 5. In this way, not only the structure is simple and compact, but also the first static ring 4 and the second static ring 5 can be effectively prevented from being damaged by the first seal grinding surface. , Rotation occurs under the friction of the second sealing grinding surface.

The bearing end cover 19 used to fix the bearing is sleeved on the shaft sleeve 10, and the skeleton seal 15 is arranged between the bearing end cover 19 and the shaft sleeve 10, and the skeleton seal 15 is located in the middle of the shaft sleeve 10. In this way, not only the structure is simple and compact, Moreover, the sealing function of the skeleton seal 15 can effectively prevent the oil in the gear box 20 from entering the mechanical seal.

The second moving ring 6, the shaft sleeve 10 and the rotating shaft 2 are all connected by screws. In this way, not only the structure is simple, compact, and the connection is reliable, but also the design requirements of the circumferential linkage are well met, that is, the second moving ring 6, the shaft sleeve 10 Design requirements for synchronous rotation with the rotating shaft 2.

The right side of the first static ring 4 is provided with a spring seat 13, the spring seat 13 is an annular member, and the spring seat 13 is provided with some blind holes for installing the second elastic member 9, so that the second elastic member 9 can be provided with an accommodating And guided blind holes make the second elastic member 9 work more reliably and stably; the moving ring seat 7 is provided with a number of blind holes of similar structure for installing the first elastic member 8. In this way, not only the structure is simple and compact, but also can give The first elastic member 8 provides a blind hole for receiving and guiding, so that the first elastic member 8 works more reliably and stably; both the first elastic member 8 and the second elastic member 9 are springs.

A material blocking plate 17 is provided on the left side of the bearing end cover 19 , and the material blocking plate 17 is sleeved on the shaft sleeve 10 .

A sealing ring 12 is provided between the shaft sleeve 10 and the rotating shaft 2. The sealing ring 12 is O-shaped and is located on the right side of the shaft sleeve 10, close to the left end surface of the inner ring 11. In this way, the oil in the gearbox 20 can be more effectively prevented from Leakage into the mechanical seal.

Fig. 2 is a rotor pump with two rotating shafts 2, and each rotating shaft 2 is equipped with a water-cooled mechanical seal structure for the pump of the present invention.

The left and right directionality described herein is based on the directions shown in the figures.

Claims (2)

1. A water-cooled mechanical seal structure for a pump, which includes a mechanical seal seat (1), a first moving ring (3) that is circumferentially linked with a rotating shaft (2), and a first static ring on the mechanical seal seat (1). Ring (4) and the second static ring (5), the second moving ring (6) which is linked with the rotating shaft (2) in the circumferential direction, the first moving ring (3) is set on the moving ring seat (7), the first moving ring Between the ring (3) and the moving ring seat (7) there are several first elastic pieces (8) along the circumference of the rotating shaft (2), and one end of each first elastic piece (8) is offset against the moving ring seat (7). The other end of the first elastic part (8) is against the first moving ring (3), and there are several second elastic parts along the circumference of the rotating shaft (2) between the first static ring (4) and the second static ring (5) (9), one end of each second elastic piece (9) is against the first static ring (4), and the other end of each second elastic piece (9) is against the second static ring (5), the first The right end surface of a moving ring (3) and the left end surface of the first static ring (4) are opposed to form the first sealing grinding surface, and the right end surface of the second static ring (5) and the left end surface of the second moving ring (6) The surface is opposed to form the second sealing grinding surface, which is characterized in that it also includes a shaft sleeve (10) arranged on the right side of the second moving ring (6) and circumferentially linked with the rotating shaft (2), and the left end of the shaft sleeve (10) The surface abuts against the right end surface of the second moving ring (6), and the right end surface of the shaft sleeve (10) abuts against the left end surface of the inner ring (11) of the bearing installed on the rotating shaft (2). 2. The pump water-cooled mechanical seal structure according to claim 1, characterized in that a sealing ring (12) is provided between the shaft sleeve (10) and the rotating shaft (2).

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