A forced transmission double-ended assembled mechanical seal

Abstract

The present invention discloses a forced transmission double-end face assembled mechanical seal. The intermediate dynamic ring and the intermediate static ring are frictionally and sealingly connected. On the other side of the gland, there is a static cooling ring seat, and the static cooling ring seat is connected with a static cooling ring. The dynamic cooling ring and the static cooling ring are frictionally and sealingly connected. The dynamic cooling ring and the intermediate dynamic ring are respectively clamped on both sides of the protective sleeve in the middle. And the spring passes through the through holes on the protective sleeve and respectively abuts against the dynamic cooling ring and the intermediate dynamic ring. The protective sleeve passes through the static cooling ring seat on the side of the static cooling ring to form an elastic pressing part. The locking ring is sleeved outside the elastic pressing part and is connected with the static cooling ring seat by the positioning block. The circumferentially arranged screws pass through the positioning block and the locking ring to compress the elastic pressing part. The gland is provided with liquid channels on its two opposite faces. The pump shaft passes through the middle of the mechanical seal structure. Through the setting of the protective sleeve structure and the forced transmission of the intermediate dynamic ring and the dynamic cooling ring in cooperation with the protective sleeve, the present invention can effectively solve the problem of shaft abrasion. Moreover, this structure has high sealing efficiency, is light in volume, has strong comprehensive performance, wide application range and low manufacturing cost.

Description

Technical Field

[0001] The present invention relates to the field of mechanical seals, and particularly to a forced-drive double-end face assembled mechanical seal. Background Art

[0002] Due to the pressure difference between the fluid inside the pump and the atmosphere outside the pump, in order to prevent the slurry from leaking, a sealing device needs to be provided during the operation of the pump. In the chemical industry, the transportation of strongly corrosive and high-temperature media is often encountered. The mechanical seal of a common fluorine-lined chemical pump generally adopts a WB2 externally mounted mechanical seal, which can only withstand a maximum temperature of 100 degrees. When the temperature is too high, it may cause the small spring to be compressed too much and the shaft drive to be too large, resulting in excessive wear of the sealing surface, or problems with the O-ring or connecting metal components, leading to leakage. When the pump is transporting high-temperature corrosive media, the temperature generated by the mutual abrasion of the dynamic ring and the static ring of the mechanical seal cannot be cooled.

[0003] Moreover, during the current mechanical seal process, due to the swaying of the equipment or the machining error of the equipment, the phenomenon of shaft grinding may occur. And currently, most mechanical seals adopt a polytetrafluoroethylene structure, which is prone to mechanical seal wear when working in an alkaline environment or containing metal particles, and the polytetrafluoroethylene structure is prone to tearing. Summary of the Invention

[0004] In order to solve the above problems, the present invention provides a forced-drive double-end face assembled mechanical seal. Through the setting of the protective sleeve structure and the forced drive of the intermediate dynamic ring and the cold dynamic ring in cooperation with the protective sleeve, the problem of shaft grinding can be effectively solved. Moreover, the structure of this mechanical seal is small in volume and strong in acid and alkali resistance.

[0005] To achieve the above object, the technical solution adopted by the present invention is: a forced transmission double-end face assembled mechanical seal, including a through protection sleeve, an intermediate driving ring, a cold driving ring and a gland. One side of the gland is provided with an intermediate static ring, the intermediate driving ring is frictionally and sealingly connected with the intermediate static ring, the other side of the gland is provided with a cold static ring seat, the cold static ring seat is connected with a cold static ring, the cold driving ring is frictionally and sealingly connected with the cold static ring, the cold driving ring and the intermediate driving ring are respectively clamped on both sides of the protection sleeve and have circumferential degrees of freedom. Two cold driving ring fixing ports are vertically arranged on the protection sleeve, and two intermediate driving ring fixing ports are orthogonally and horizontally arranged. Two protruding engaging parts on the cold driving ring and the intermediate driving ring are respectively engaged with the cold driving ring fixing port and the intermediate driving ring fixing port, and the size of the engaging part is smaller than the opening sizes of the cold driving ring fixing port and the intermediate driving ring fixing port. Springs pass through the through holes on the protection sleeve and respectively abut against the cold driving ring and the intermediate driving ring. The protection sleeve passes through the cold static ring seat on one side of the cold static ring to form an elastic pressing part, and the elastic pressing part is a ring-shaped multi-petal structure; a locking ring is sleeved outside the elastic pressing part and is connected with the cold static ring seat through a positioning block, and a circumferentially arranged screw passes through the positioning block and the locking ring to press the elastic pressing part. The gland is provided with liquid channels on its two opposite faces, and the pump shaft passes through the middle of the mechanical seal structure.

[0006] Further, an L-shaped gasket is provided between the cold static ring and the cold static ring seat.

[0007] Further, a first sealing ring, a second sealing ring and a third sealing ring are provided at the connection between the intermediate static ring and the gland.

[0008] Further, a fourth sealing ring is provided between the protection sleeve and the intermediate driving ring.

[0009] Further, a fifth sealing ring is provided between the protection sleeve and the cold driving ring.

[0010] Further, a sixth sealing ring is provided between the cold static ring seat and the gland.

[0011] Further, a seventh sealing ring is also provided between the protection sleeve and the pump shaft.

[0012] Further, the locking ring is fixed by engaging the hook portion on it with the convex portion on the cold static ring seat.

[0013] In summary, the present invention has the following advantages:

[0014] The present invention provides a forced transmission double-end face assembled mechanical seal. Through the setting of the protection sleeve structure and the forced transmission of the intermediate driving ring and the cold driving ring in cooperation with the protection sleeve, the problem of shaft abrasion can be effectively solved. Moreover, the volume of this mechanical seal structure is small and the acid and alkali resistance ability is strong.

[0015] The present invention adopts the forced transmission between the protective sleeve and the two moving rings, combines the friction seal between the moving ring and the static ring, and seals the cooling chamber at multiple points, replacing the water-sealed bearing. While saving raw materials, it improves the corrosion and rust resistance, expands the application range of the original equipment, reduces the cost, and makes it more energy-efficient and environmentally friendly.

[0016] Moreover, the dry grinding phenomenon will not occur between the moving ring and the static ring of the present invention under the action of the coolant.

[0017] Furthermore, the present invention has two moving rings provided with openings on the protective sleeve, and the overall structure is small in size and simple in connection with the cooperation of the springs. Description of the Drawings

[0018] Figure 1 is the structural sectional view of the present invention;

[0019] Figure 2 is the front view of the protective sleeve of the present utility model. Detailed Embodiment

[0020] The present invention will be further described below in conjunction with the drawings and embodiments: Embodiment

[0021] A forced transmission double-end face assembled mechanical seal, as Figure 1 and 2 shown, includes a through protective sleeve 5, an intermediate moving ring 3, a cold moving ring 6 and a gland 1.

[0022] In its specific connection, an intermediate static ring 2 is provided on one side of the gland 1, the intermediate moving ring 3 is frictionally and sealingly connected to the intermediate static ring 2, a static cold ring seat 8 is provided on the other side of the gland 1, the static cold ring seat 8 is connected with a static cold ring 7, and a sixth sealing ring 21 is provided between the static cold ring seat 8 and the gland 1.

[0023] The cold moving ring 6 is frictionally and sealingly connected to the static cold ring 7, the cold moving ring 6 and the intermediate moving ring 3 are respectively clamped on both sides of the protective sleeve 5 and have circumferential degrees of freedom. The spring 4 passes through the through hole 51 on the protective sleeve 5 and respectively abuts against the cold moving ring 6 and the intermediate moving ring 3. Specifically, two cold moving ring fixing ports 53 are vertically provided orthogonally on the protective sleeve 5, and two intermediate moving ring fixing ports 54 are horizontally provided orthogonally. The two protruding engaging parts on the cold moving ring 6 and the intermediate moving ring 3 are respectively engaged with the cold moving ring fixing port 53 and the intermediate moving ring fixing port 54, and the size of the engaging part is smaller than the opening size of the cold moving ring fixing port 53 and the intermediate moving ring fixing port 54, that is, the engaging part on the intermediate moving ring is slightly smaller than the intermediate moving ring fixing port and can rotate slightly circumferentially, and the engaging part on the cold moving ring is slightly smaller than the cold moving ring engaging part and can rotate slightly circumferentially, forming a forced transmission structure of the moving ring.

[0024] In the connection between the protective sleeve and the pump shaft 100, the pump shaft 100 passes through the middle of the mechanical seal structure, and the protective sleeve 5 passes through the cooling ring seat 8 on one side of the cooling ring 7 to form an elastic pressure portion 52. The elastic pressure portion 52 is an annular multi-petal structure, so that it has inward elastic deformation performance, and the elastic pressure portion is provided with a retaining spring 12 for easy fixation.

[0025] The locking ring 9 is sleeved on the outside of the elastic pressure part 52 and connected to the cooling ring seat 8 through the positioning block 10. The ring-mounted screw 11 passes through the positioning block 10 and the locking ring 9 to press the elastic pressure part 52, specifically the petal-shaped part, thereby pressing the pump shaft. In terms of the working mechanism of the locking ring 9, the locking ring 9 engages the convex part on the cooling ring seat 8 through the hook part thereon to form a fixation.

[0026] The gland 1 is provided with liquid channels 200 on two opposite surfaces thereof for circulating the cooling liquid.

[0027] In the multi-point sealing of the coolant flow wall of the mechanical seal structure, a first sealing ring 20, a second sealing ring 19 and a third sealing ring 18 are provided at the connection between the static ring 2 and the gland 1.

[0028] Preferably, a fourth sealing ring 17 is provided between the protective sleeve 5 and the movable ring 3 .

[0029] Preferably, a fifth sealing ring 15 is provided between the protective sleeve 5 and the cooling ring 6 .

[0030] Preferably, a sixth sealing ring 21 is provided between the cooling ring seat 8 and the gland 1 .

[0031] Furthermore, a seventh sealing ring 16 is provided between the protective sleeve 5 and the pump shaft 100 .

[0032] To further explain its working mechanism, the coolant enters from the liquid channel 200 on one side and flows out from the liquid channel on the other side to form a circulation. The pump shaft is connected to form a whole through a static ring, a dynamic ring, multiple sealing rings, a spring, a central protective sleeve that does not contact the medium, a cooling ring, a cooling dynamic ring, a pressure cover and a limit block, and a locking ring. The pump shaft is locked by the locking ring and the elastic pressure part under the action of the screw 11. After the pump shaft rotates, it drives the two dynamic rings to rotate together. Under the action of the multi-pass sealing structure, the sealing performance of the entire mechanical seal structure is good. In addition, the coolant cooperates with the spring on the protective sleeve to press against the cooling dynamic ring and the static ring, so that the friction surface sealing effect of the dynamic ring and the static ring is good, and dry grinding will not occur.

[0033] Moreover, the mechanical seal structure of this machine, through the setting of the protective sleeve structure and the forced transmission of the driving ring and the cold driving ring in cooperation with the protective sleeve, can ensure that the moving ring can rotate with the pump shaft, has a certain buffer, can effectively solve the problem of shaft abrasion, and can effectively solve the problems of increased cost caused by abnormal shaft abrasion and the uncontrollable risks to personnel and the environment caused by high-temperature, high-pressure, and strong-corrosion working conditions. Moreover, the mechanical seal structure of this machine is small in size and strong in acid and alkali resistance.

[0034] In summary, the present invention adopts the forced transmission between the protective sleeve and the two moving rings, in cooperation with the friction seal between the moving ring and the static ring, and seals multiple points of the cooling chamber, replacing the water-sealed bearing. While saving raw materials, it improves the corrosion and rust resistance performance, expands the application range of the original equipment, and reduces the cost, making it more energy-efficient and environmentally friendly.

[0035] This structure is energy-saving and environmentally friendly, has high sealing efficiency, is light in weight, has strong comprehensive performance, a wide application range, and low manufacturing cost. At the same time, it solves the problems of mechanical seal failure caused by dry grinding due to poor medium supply, blockage, local vacuum, etc. during the operation of the equipment.

[0036] Moreover, the moving ring and the static ring of the present invention will not show dry grinding under the action of the coolant.

[0037] Furthermore, the present invention has two moving rings provided with openings on the protective sleeve, and in cooperation with the spring, the overall structure is small in size and simple in connection.

[0038] The above embodiments are only for illustrating the technical concept and characteristics of the present invention, and the purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the protection scope of the present invention. Any equivalent transformation or modification made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

[0039] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components.

[0040] For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0041] It should be understood that the above embodiments are only exemplary and not restrictive. Without departing from the basic principles of the present invention, various obvious or equivalent modifications or substitutions made by those skilled in the art to the above details will be included within the scope of the claims of the present invention.

Claims

1. A forced transmission double-ended assembled mechanical seal, characterized in that: It includes a protective sleeve (5) with a central through hole, a dynamic intermediate ring (3), a dynamic cooling ring (6) and a gland (1). On one side of the gland (1), there is a static intermediate ring (2). The dynamic intermediate ring (3) is friction-sealed to the static intermediate ring (2). On the other side of the gland (1), there is a static cooling ring seat (8). The static cooling ring seat (8) is connected to a static cooling ring (7). The dynamic cooling ring (6) is friction-sealed to the static cooling ring (7). The dynamic cooling ring (6) and the dynamic intermediate ring (3) are respectively clamped on both sides of the protective sleeve (5) and have circumferential degrees of freedom. On the protective sleeve (5), there are two vertically arranged dynamic cooling ring fixing ports (53) and two orthogonally and horizontally arranged dynamic intermediate ring fixing ports (54). The two protruding engaging parts on the dynamic cooling ring (6) and the dynamic intermediate ring (3) are respectively engaged with the dynamic cooling ring fixing port (53) and the dynamic intermediate ring fixing port (54), and the size of the engaging part is smaller than the opening size of the dynamic cooling ring fixing port (53) and the dynamic intermediate ring fixing port (54). And a spring (4) passes through the through hole (51) on the protective sleeve (5) and abuts against the dynamic cooling ring (6) and the dynamic intermediate ring (3) respectively. The protective sleeve (5) forms an elastic pressing part (52) by passing through the static cooling ring seat (8) on one side of the static cooling ring (7). This elastic pressing part is a ring-shaped multi-petal structure; a locking ring (9) is sleeved outside the elastic pressing part (52) and is connected to the static cooling ring seat (8) through a positioning block (10). The circumferentially arranged screws (11) pass through the positioning block (10) and the locking ring (9) to press the elastic pressing part (52). The gland (1) is provided with liquid channels (200) on its two opposite surfaces. The pump shaft (100) passes through the middle of the mechanical seal structure.

2. The forced transmission double-ended assembled mechanical seal according to claim 1, characterized in that: An L-shaped gasket (14) is provided between the static cooling ring (7) and the static cooling ring seat (8).

3. The forced transmission double-ended assembled mechanical seal according to claim 1, wherein: A first sealing ring (20), a second sealing ring (19) and a third sealing ring (18) are provided at the connection between the static intermediate ring (2) and the gland (1).

4. The forced drive double-ended assembled mechanical seal according to claim 1, wherein: A fourth sealing ring (17) is provided between the protective sleeve (5) and the dynamic intermediate ring (3).

5. The forced transmission double-end face assembled mechanical seal according to claim 1, characterized in that: A fifth sealing ring (15) is provided between the protective sleeve (5) and the dynamic cooling ring (6).

6. The forced transmission double-ended assembled mechanical seal according to claim 1, wherein: A sixth sealing ring (21) is provided between the static cooling ring seat (8) and the gland (1).

7. The forced transmission double-end face assembled mechanical seal according to claim 1, characterized in that: A seventh sealing ring (16) is further provided between the protective sleeve (5) and the pump shaft (100).

8. The forced transmission double-ended assembled mechanical seal according to claim 1, wherein: The locking ring (9) is fixed by engaging the hook part on it with the convex part on the static cooling ring seat (8).

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