CN203335465U - Double floating wear ring sealing device of centrifugal pump - Google Patents

Abstract

A double-channel floating mouth ring sealing device for a centrifugal pump. The floating wear-resistant ring is preloaded by a floating pressure ring and a spring; Floating mouth ring seal. The fixed neck ring and the floating wear ring adopt zigzag sealing structure to further reduce the leakage loss; the fixed neck ring and the inner wall of the impeller adopt a larger gap, and the floating wear ring and the outer wall of the impeller adopt a smaller gap, which can The shape and position deviation caused by the assembly error is compensated by the self-calibration function of the floating ring; it not only effectively reduces the leakage loss at the mouth ring, but also effectively eliminates the noise caused by the transitional wear and friction caused by the small gap, and greatly Improves the efficiency of the centrifugal pump and avoids wear between the mouth ring and the impeller. At the same time, the double-channel sealing ring structure can also effectively balance the force on the inner and outer walls of the impeller, making the force on the impeller more uniform to achieve more stable operation.

Description

A double-channel floating mouth ring sealing device for a centrifugal pump

technical field

The invention belongs to the technical field of centrifugal pump manufacturing, in particular to a double-channel floating mouth ring sealing device for a centrifugal pump.

Background technique

At present, the impeller and mouth ring seals of centrifugal pumps are mostly single-channel fixed mouth ring seal structures, and a radial clearance of 0.3-0.5mm is processed between the impeller and the mouth ring. A certain sealing effect, but because the single-pass ring is a fixed structure, the shape and position deviation caused by processing and assembly tends to be close to, or even exceed the reserved radial clearance, resulting in friction between the impeller and the ring, resulting in The wear of the impeller and the mouth ring, and at the same time, the impeller is prone to jamming. In addition, since there is only one seal between the impeller and the mouth ring in the single-channel seal, the leakage loss will be relatively large, which will affect the efficiency of the water pump. U.S. Patent US4208166A "Adjustable wear ring for a centrifugal pump" proposes an adjustable wear ring seal structure, the seal ring adopts a zigzag structure, this structure has better sealing performance, but due to the adjustment of the wear ring needs The limit adjustment is performed through the limit pin, and each adjustment needs to be stopped for operation, and this single-channel sealing structure usually has a small gap, so there is still friction between the impeller and the wear-resistant ring. Chinese patent 200780002190.9 "Flexible Floating Ring Sealing Device for Rotor Power Pumps" proposes a flexible floating ring sealing structure for rotor power pumps. The gap between the impeller and the flexible ring is small to reduce leakage loss. There is friction between the impeller and the flexible ring in this structure, and the gap will increase due to the wear of the impeller or flexible ring during long-term operation. , thereby exacerbating the leakage loss.

Contents of the invention

The technical problem to be solved by the present invention is that friction and jamming occur between the impeller and the seal ring due to the too small radial gap between the existing single-channel fixed mouth ring and the impeller, and at the same time, the leakage of the single-channel seal The loss is large. With the long-term wear of the impeller and the mouth ring, the gap will continue to increase, the leakage loss will further increase, and the efficiency of the pump will further decrease. In order to solve the above technical problems, a double-channel floating mouth ring sealing device is proposed. This double-channel floating mouth ring sealing device has a simple structure and is easy to install. The floating ring of the outer ring has the function of automatic centering, which solves the problem of The friction and jamming phenomenon, the use of the inner and outer rings effectively reduces the leakage loss and improves the efficiency of the centrifugal pump.

The technical solution of the present invention is: a double-channel floating mouth ring sealing device for a centrifugal pump, including a fixed neck ring, a floating wear-resistant ring, a floating pressure ring, a fixed pressure ring, a spring and an inner hexagon bolt. All parts are made of stainless steel 304 as the original base material. First, determine the geometric dimension of the fixed neck ring, which is determined by the size of the pump body mouth ring groove. In order to reduce the leakage loss of the inner wall of the impeller inlet, the sealing surface of the fixed neck ring adopts a sawtooth shape, forming the first sealing structure with the inner wall of the impeller Then, according to the size of the fixed neck ring, determine the size of the floating wear-resistant ring, the sealing surface of the floating wear-resistant ring adopts a sawtooth shape, install the designed floating wear-resistant ring in the fixed neck ring, and form a second road with the outer wall of the impeller Then place the floating pressure ring on the floating wear-resistant ring, and at the same time, put the springs on the 4 small support columns evenly distributed on the circumference of the floating pressure ring; then put the fixed pressure ring with 4 through holes Installed on the floating pressure ring, the fixed pressure ring is positioned by the four supporting columns on the floating pressure ring, so that the spring is between the floating pressure ring and the fixed pressure ring; finally, the fixed pressure ring is fixed on the fixed neck by the hexagon socket bolt On the ring, the spring is under a certain pressure and is in a compressed state, resulting in elastic deformation. The elastic force acts on the floating pressure ring and the floating wear-resistant ring, so that the gap between the floating pressure ring and the floating wear-resistant ring, and the floating wear-resistant ring A certain frictional force is generated between the fixed neck ring, which can overcome the gravity of the floating wear-resistant ring itself, so as to ensure that the floating wear-resistant ring is in a temporary static state without external force. Through the sequential assembly of the above functional parts, a double-channel floating mouth ring sealing device is realized. Wherein, there is a certain adjustable gap between the floating wear-resistant ring and the fixed neck ring, which is used to control the floating range of the floating wear-resistant ring. The outer ring of the fixed neck ring has 4 installation holes evenly distributed around the circumference, which are used to fix the integral sealing device in the mouth ring groove of the pump body.

The fixed neck ring is a sawtooth sealing structure, which adopts double-saw teeth, and the gap between the teeth is 4mm; the theoretical unilateral gap between the fixed neck ring and the inner wall of the impeller is designed to be 0.5mm, and the larger gap can effectively prevent the inner wall of the impeller from contacting the fixed neck. The friction of the ring forms the first sealing structure; there are 4 evenly distributed M4 threaded holes on the fixed neck ring, which are used for the final locking of the fixed pressure ring; the outer ring of the fixed neck ring has 4 uniformly distributed circumferential holes. Φ6 mounting hole, used for the final connection of the integral sealing device and the pump body mouth ring groove.

The floating wear-resistant ring is a sawtooth-shaped sealing structure, using double-saw teeth, the gap between the teeth is 4mm, the theoretical unilateral gap between the floating wear-resistant ring and the outer wall of the impeller is designed to be 0.2mm, and the small gap can effectively reduce the leakage , reduce leakage loss; at the same time, under the action of the impeller, the assembly and processing errors of the impeller and the entire rotor system are automatically adjusted by the floating wear-resistant ring, which effectively solves the gap between the impeller and the floating wear-resistant ring caused by the small gap. Friction improves the service life of the impeller and floating wear ring. The radial adjustable gap G between the floating wear-resistant ring and the fixed neck ring can be designed to be 0.5-1mm according to the size of the impeller. For example, when the adjustable gap G is set to 0.5mm, the maximum compensable margin on one side is 0.5 mm, plus the theoretical one-sided clearance of 0.2mm between the impeller and the floating wear-resistant ring, the maximum adjustable clearance on one side of the floating wear-resistant ring reaches 0.7mm, which effectively compensates for the shape and position deviation caused by assembly and eliminates the b Friction with floating wear ring.

The floating pressure ring forms a radial positioning between the 4 support columns evenly distributed on the circumference and the fixed pressure ring. The cooperation between the 4 support columns and the 4 positioning holes on the fixed pressure ring adopts a 7-level tolerance hole: H7 and shaft: h7 Clearance fit is carried out to ensure the assembly function; at the same time, the floating pressure ring is axially positioned by the spring and the fixed pressure ring to ensure the axial dimension of the floating pressure ring. The sealing device, through the elastic force provided by the spring, forms a certain friction force between the floating wear-resistant ring and the floating pressure ring, so as to overcome the gravity of the floating wear-resistant ring itself, and ensure that the floating wear-resistant ring is temporarily stationary without external force state; when the radial force caused by the beating during the rotation of the impeller acts on the floating wear-resistant ring, the floating wear-resistant ring can automatically center itself under its action, change the initial position, and adjust to the best operating position, effectively Avoid friction between the floating wear ring and the impeller.

The beneficial effects of the present invention are:

1. Change the original single-channel fixed mouth ring structure into a double-channel floating mouth ring structure to better seal the inside and outside of the impeller;

2. The double-channel zigzag sealing structure effectively reduces the leakage loss and improves the efficiency of the centrifugal pump;

3. The floating wear-resistant ring design effectively eliminates the friction and jamming between the impeller and the mouth ring, prolonging the service life of the parts;

4. The double-channel floating ring device is connected by bolts, which can be quickly installed and disassembled;

5. The double seal ring structure can also effectively balance the force on the inner and outer walls of the impeller, making the force on the impeller more uniform and achieving more stable operation.

Description of drawings

FIG. 1 is a schematic cross-sectional view of a double-channel floating lip-ring sealing device according to the present invention.

FIG. 2 is an overall schematic diagram of the installation of FIG. 1 .

FIG. 3 is an enlarged schematic view of the installation details in FIG. 1 , that is, an enlarged view of the details circled in FIG. 2 .

Figure 4 is an enlarged view of the components of the double-channel floating mouth ring sealing device.

Fig. 5 is a schematic diagram of the structure of the fixed neck ring.

Fig. 6 is a schematic diagram of the structure of the floating wear-resistant ring.

Fig. 7 is a left view of the structure of the floating pressure ring.

Fig. 8 is a schematic diagram of the structure of the fixed pressure ring.

In the figure: 1. Fixed neck ring, 2. Floating wear-resistant ring, 3. Floating pressure ring, 4. Fixed pressure ring, 5. Spring, 6. Hexagon socket bolt, a. Double-channel floating mouth ring sealing device, b .impeller.

Detailed ways

A double-channel floating mouth ring sealing device for a centrifugal pump comprises a fixed neck ring, a floating wear-resistant ring, a floating pressure ring, a fixed pressure ring, a spring and an inner hexagon bolt. All parts are made of stainless steel 304 as the original base material. First, determine the geometric dimension of the fixed neck ring, which is determined by the size of the pump body mouth ring groove. In order to reduce the leakage loss of the inner wall of the impeller inlet, the sealing surface of the fixed neck ring adopts a sawtooth shape, forming the first sealing structure with the inner wall of the impeller Then, according to the size of the fixed neck ring, determine the size of the floating wear-resistant ring, the sealing surface of the floating wear-resistant ring adopts a sawtooth shape, install the designed floating wear-resistant ring in the fixed neck ring, and form a second road with the outer wall of the impeller Then place the floating pressure ring on the floating wear-resistant ring, and at the same time, put the springs on the 4 small support columns evenly distributed on the circumference of the floating pressure ring; then put the fixed pressure ring with 4 through holes Installed on the floating pressure ring, the fixed pressure ring is positioned by the four supporting columns on the floating pressure ring, so that the spring is between the floating pressure ring and the fixed pressure ring; finally, the fixed pressure ring is fixed on the fixed neck by the hexagon socket bolt On the ring, the spring is under a certain pressure and is in a compressed state, resulting in elastic deformation. The elastic force acts on the floating pressure ring and the floating wear-resistant ring, so that the gap between the floating pressure ring and the floating wear-resistant ring, and the floating wear-resistant ring A certain frictional force is generated between the fixed neck ring, which can overcome the gravity of the floating wear-resistant ring itself, so as to ensure that the floating wear-resistant ring is in a temporary static state without external force. Through the sequential assembly of the above functional parts, a double-channel floating mouth ring sealing device is realized. Wherein, there is a certain adjustable gap between the floating wear-resistant ring and the fixed neck ring, which is used to control the floating range of the floating wear-resistant ring. The outer ring of the fixed neck ring has 4 installation holes evenly distributed around the circumference, which are used to fix the integral sealing device in the mouth ring groove of the pump body.

The fixed neck ring is a sawtooth sealing structure, which adopts double-saw teeth, and the gap between the teeth is 4mm; the theoretical unilateral gap between the fixed neck ring and the inner wall of the impeller is designed to be 0.5mm, and the larger gap can effectively prevent the inner wall of the impeller from contacting the fixed neck. The friction of the ring forms the first sealing structure; there are 4 evenly distributed M4 threaded holes on the fixed neck ring, which are used for the final locking of the fixed pressure ring; the outer ring of the fixed neck ring has 4 uniformly distributed circumferential holes. Φ6 mounting hole, used for the final connection of the integral sealing device and the pump body mouth ring groove.

The floating wear-resistant ring is a sawtooth-shaped sealing structure, using double-saw teeth, the gap between the teeth is 4mm, the theoretical unilateral gap between the floating wear-resistant ring and the outer wall of the impeller is designed to be 0.2mm, and the small gap can effectively reduce the leakage , reduce leakage loss; at the same time, under the action of the impeller, the assembly and processing errors of the impeller and the entire rotor system are automatically adjusted by the floating wear-resistant ring, which effectively solves the gap between the impeller and the floating wear-resistant ring caused by the small gap. Friction improves the service life of the impeller and floating wear ring. The radial adjustable gap G between the floating wear-resistant ring and the fixed neck ring can be designed to be 0.5-1mm according to the size of the impeller. For example, when the adjustable gap G is set to 0.5mm, the maximum compensable margin on one side is 0.5 mm, plus the theoretical one-sided clearance of 0.2mm between the impeller and the floating wear-resistant ring, the maximum adjustable clearance on one side of the floating wear-resistant ring reaches 0.7mm, which effectively compensates for the shape and position deviation caused by assembly and eliminates the b Friction with floating wear ring.

The floating pressure ring forms a radial positioning between the 4 support columns evenly distributed on the circumference and the fixed pressure ring. The cooperation between the 4 support columns and the 4 positioning holes on the fixed pressure ring adopts a 7-level tolerance hole: H7 and shaft: h7 Clearance fit is carried out to ensure the assembly function; at the same time, the floating pressure ring is axially positioned by the spring and the fixed pressure ring to ensure the axial dimension of the floating pressure ring. The sealing device, through the elastic force provided by the spring, forms a certain friction force between the floating wear-resistant ring and the floating pressure ring, so as to overcome the gravity of the floating wear-resistant ring itself, and ensure that the floating wear-resistant ring is temporarily stationary without external force state; when the radial force caused by the beating during the rotation of the impeller acts on the floating wear-resistant ring, the floating wear-resistant ring can automatically center itself under its action, change the initial position, and adjust to the best operating position, effectively Avoid friction between the floating wear ring and the impeller.

Referring to Fig. 1, the double-channel floating mouth ring sealing device of the present invention includes main parts such as a fixed neck ring 1, a floating wear-resistant ring 2, a floating pressure ring 3 and a fixed pressure ring 4, and also includes a Adjusted spring 5, the final overall assembly is fixed by hexagon socket head bolt 6. The radially adjustable gap G between the floating wear ring 2 and the fixed neck ring 1 can be designed according to the size of the impeller, and the recommended value is usually 0.5-1mm.

Combined with Figure 2 and Figure 3, the double-channel floating mouth ring sealing device a is installed in the pump casing through bolts, and forms a double-channel sealing structure with the impeller b.

Referring to Figure 4, the assembly sequence of the double-channel floating mouth ring seal device is the fixed neck ring 1, the floating wear-resistant ring 2, the floating compression ring 3, the spring 5, the fixed compression ring 4 and the hexagon socket bolt 6.

Combined with Figure 5 and Figure 6, the inner ring surface of the fixed neck ring 1 is sawtooth-shaped. Compared with the smooth surface, the sealing effect of the serrated surface is better, mainly because the serrated surface can effectively slow down the velocity of the fluid, thereby reducing the flow rate of the fluid per unit time. Leakage; fixed neck ring 1 has 4 threaded holes for installing hexagon socket bolts 6; at the same time, fixed neck ring 1 has 4 through holes for installation between the entire device and the pump casing. The inner ring surface of the floating wear ring 2 is serrated to ensure better sealing efficiency.

Referring to Fig. 7 and Fig. 8, the floating pressure ring 3 itself has 4 supporting columns, which are used for the positioning spring 5, so as to ensure that the floating wear-resistant ring 2 can be relatively freely adjusted automatically. The fixed pressure ring 4 has 8 through holes for assembling the fixed floating pressure ring and the overall device respectively.

The working process is as follows:

When the centrifugal pump is working, the outlet of the impeller is a high-pressure area, and the inlet of the impeller is a low-pressure area. A double-channel sealing structure is formed between the double-channel floating mouth ring sealing device and the impeller, which effectively reduces the liquid from the high-pressure area to the low-pressure area. Flow, the liquid in the high-pressure area at the outlet of the impeller first passes through the first-stage seal groove, and the first-stage seal groove is located between the floating wear-resistant ring and the outer wall of the impeller. The wear-resistant ring is automatically adjusted with the operation of the impeller to maintain an ideal gap between the final impeller and the mouth ring, eliminating friction and jamming between the impeller and the floating wear-resistant ring. Then, the impeller enters the secondary sealing groove from the primary sealing groove. The secondary sealing groove is located between the inner wall of the impeller and the fixed neck ring. Due to the large radial gap between the fixed neck ring and the inside of the impeller, its sealing effect will be weakened. However, the large clearance ensures smooth running between the impeller and the fixed neck ring, eliminating friction between the impeller and the fixed neck ring. The effective use of the primary and secondary seals greatly reduces the leakage loss in the centrifugal pump and improves the efficiency of the centrifugal pump; at the same time, the design of the floating wear-resistant ring effectively avoids the friction and seizure between the impeller and the mouth ring , which further improves the service life of the impeller and the mouth ring, and ensures the safe operation of the centrifugal pump.

The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments. What are described in the above-mentioned embodiments and the description are only to illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have Various changes and improvements fall within the scope of the claimed invention, which is defined by the appended claims and their equivalents.

Claims (10)

1. a centrifugal pump two pass floating type opening ring seal arrangement, it is characterized in that, comprise fixedly neck ring (1), the wear ring (2) that floats, unsteady pressure ring (3), fixed pressure ring (4), spring (5) and hexagon socket head cap screw (6), the wear ring (2) that floats is installed on fixedly in neck ring (1), the pressure ring (3) that floats is placed on unsteady wear ring (2), and spring (5) is enclosed within respectively on unsteady pressure ring (3) circumference on equally distributed 4 little supporting posts; Then will be installed on the fixed pressure ring (4) of 4 through holes unsteady pressure ring (3) upper, by 4 supporting posts on the pressure ring (3) that floats, fixed pressure ring (4) be positioned, spring (5) is positioned between unsteady pressure ring (3) and fixed pressure ring (4); Finally by hexagon socket head cap screw (6), fixed pressure ring (4) is fixed on fixedly to neck ring (1) upper, wear ring (2) and fixedly between neck ring (1), certain adjustable clearance is arranged floats.

2. a kind of centrifugal pump two pass floating type opening ring seal arrangement according to claim 1, is characterized in that, described fixedly neck ring (1) is the zigzag fashion sealing configuration, adopts the two pass sawtooth, and the gap between sawtooth is 4mm.

3. a kind of centrifugal pump two pass floating type opening ring seal arrangement according to claim 1 and 2, is characterized in that, described fixedly neck ring (1) becomes 0.5mm with the monolateral gap design of the theory of impeller inwall.

4. a kind of centrifugal pump two pass floating type opening ring seal arrangement according to claim 1 and 2, is characterized in that, has 4 uniform M4 tapped holes on described fixedly neck ring (1), for the final locking of fixed pressure ring (4).

5. a kind of centrifugal pump two pass floating type opening ring seal arrangement according to claim 1 and 2, it is characterized in that, described fixedly neck ring (1) outer ring has 4 circumferential equally distributed Φ 6 mounting holes, for the final connection of integral sealing means and pump housing choma groove.

6. a kind of centrifugal pump two pass floating type opening ring seal arrangement according to claim 1 and 2, is characterized in that, described unsteady wear ring (2) is the zigzag fashion sealing configuration, adopts the two pass sawtooth, and the gap between sawtooth is 4mm.

7. a kind of centrifugal pump two pass floating type opening ring seal arrangement according to claim 1 and 2, is characterized in that, described unsteady wear ring (2) becomes 0.2mm with the monolateral gap design of the theory of impeller outer wall.

8. a kind of centrifugal pump two pass floating type opening ring seal arrangement according to claim 1 and 2, is characterized in that, described unsteady wear ring (2) and fixedly the radially adjustable clearance G between neck ring (1) can be designed to 0.5～1mm according to impeller size.

9. a kind of centrifugal pump two pass floating type opening ring seal arrangement according to claim 1 and 2, it is characterized in that, form radial location between 4 supporting posts that described unsteady pressure ring (2) distributes by even circumferential and fixed pressure ring (4), 4 supporting posts adopt 7 grades of tolerances to carry out Spielpassung with the coordinating of 4 positioning holes on fixed pressure ring (4).

10. a kind of centrifugal pump two pass floating type opening ring seal arrangement according to claim 1 and 2, is characterized in that, described unsteady pressure ring (2) has carried out axially locating by spring (5) and fixed pressure ring (4).

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