Double-end-face packaging type mechanical seal

Abstract

The utility model provides a double-end-face packaging type mechanical seal, which belongs to the technical field of mechanical seals and comprises a shaft sleeve, a first movable ring and a second movable ring fixedly connected onto the shaft sleeve, and the first movable ring and the second movable ring are respectively close to two ends of the shaft sleeve. The shaft sleeve is sleeved with the sealing seat, a first static ring and a second static ring are installed in the sealing seat and attached to the first movable ring and the second movable ring in a sealed mode respectively, the sealing seat is provided with a flange part used for being connected with the inner wall of a pump cavity, and the flange part is close to one end of the shaft sleeve and provided with a plurality of bolts. The bolt is arranged in a manner that the rod part faces the atmosphere side; the double-end-face packaging type mechanical seal has the advantages that the double-end-face packaging type mechanical seal can be installed in the direction of the inner side of a pump cavity, the flange portion of the sealing seat can be connected with the inner wall of the pump cavity through screws, and most components of the mechanical seal can be located on the atmosphere side (outside the pump cavity) through the layout of the mechanical seal.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical seals and relates to a double-end face assembled mechanical seal. Background Art

[0002] A mechanical seal is a device used to prevent the leakage of fluids or gases. It is mainly used in rotating equipment such as pumps, compressors, agitators, etc. A mechanical seal consists of two main parts: a stationary ring (mounted on the equipment housing) and a rotating ring (rotating with the shaft). These two rings are in close contact and form a sealing surface. A double-end face mechanical seal is a device with two sets of stationary rings and two sets of rotating rings.

[0003] When installing the existing double-end face assembled mechanical seal, it can only be installed from the outside of the pump cavity. Most components of the mechanical seal are located inside the pump cavity, and usually only the fastening ring is on the atmosphere side. However, some special equipment requires that the mechanical seal must be installed from the inside of the pump cavity and most components of the mechanical seal are located outside the pump cavity. The existing mechanical seal design cannot meet this special requirement, so there is still room for improvement. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a double-end face assembled mechanical seal for the above problems existing in the prior art.

[0005] The purpose of the utility model can be achieved by the following technical solutions: A double-end face assembled mechanical seal, comprising:

[0006] A shaft sleeve, on which a first rotating ring and a second rotating ring are fixedly connected. The first rotating ring and the second rotating ring are respectively close to both ends of the shaft sleeve;

[0007] A seal seat, which is sleeved on the shaft sleeve. A first stationary ring and a second stationary ring are installed in the seal seat. The first stationary ring and the second stationary ring are respectively in sealing contact with the first rotating ring and the second rotating ring. The seal seat is provided with a flange portion for connecting with the inner wall of the pump cavity. One end of the flange portion close to the shaft sleeve is provided with a plurality of bolts, and the bolts are arranged with their rod portions facing the atmosphere side.

[0008] Preferably, the flange portion is provided with a plurality of stepped holes. The number of the stepped holes is the same as that of the bolts and they are arranged in one-to-one correspondence. The large-hole part of the stepped hole is arranged close to the medium side, and the small-hole part of the stepped hole is arranged close to the atmosphere side. The head of the bolt is located in the large-hole part of the stepped hole, and the rod portion of the bolt is located in the small-hole part of the stepped hole.

[0009] Preferably, the first stationary ring and the second stationary ring are arranged adjacent to each other. A plurality of springs are also installed in the seal seat. Each spring is arranged around the shaft sleeve. The two ends of the spring are respectively in contact connection with the first stationary ring and the second stationary ring. The spring applies a sealing pressure towards the first moving ring and the second moving ring to the first stationary ring and the second stationary ring respectively.

[0010] Preferably, the seal seat is provided with a lower water inlet and an upper water outlet. Both the lower water inlet and the upper water outlet are communicated with the gap between the shaft sleeve and the seal seat.

[0011] Preferably, it further includes two guide sleeves. Both the two guide sleeves are arranged between the shaft sleeve and the seal seat, and a gap is reserved between the two guide sleeves. Both the lower water inlet and the upper water outlet are aligned with the gap between the two guide sleeves. A cleaning path is formed between the gap between the shaft sleeve and the seal seat through the two guide sleeves. The cleaning path is from the lower water inlet, passing through the areas where the first moving ring and the first stationary ring are located, the areas where the second moving ring and the second stationary ring are located in sequence, and discharged through the upper water outlet.

[0012] Preferably, auxiliary sealing rings are arranged between the inner circumferential surface of the shaft sleeve, between the shaft sleeve and the first moving ring, between the shaft sleeve and the second moving ring, between the seal seat and the first stationary ring, and between the seal seat and the second stationary ring.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] 1. A double-end face assembled mechanical seal capable of being installed from the inner side direction of the pump chamber is provided. The flange part of the seal seat can be connected with the inner wall of the pump chamber through screws, and the layout of this mechanical seal enables most of its components to be located on the atmosphere side (outside the pump chamber).

[0015] 2. The rod part of the bolt needs to face the atmosphere side, so that the flange part is located inside the pump chamber. Based on the above requirements, the stepped hole is designed such that the large hole part is close to the medium side and the small hole part faces the atmosphere side. Therefore, the rod part of the bolt can only face the atmosphere side, thereby achieving the purpose of installing this mechanical seal from the inner side of the pump chamber.

[0016] 3. The lower water inlet and the upper water outlet are actually the inlet and outlet of the cleaning and cooling channel. After the mechanical seal is installed in place, the lower water inlet is located below the seal seat, and the upper water outlet is located above the seal seat. The main purpose of adopting this design is to avoid the mechanical seal from failing due to dry running caused by accidentally closing the inlet valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1This is a schematic structural diagram of the double-ended assembled mechanical seal of the present utility model.

[0018] Figure 2 This is a partial schematic diagram of the double-ended assembled mechanical seal of the present utility model.

[0019] In the figure, 100 is a shaft sleeve; 110 is a first moving ring; 120 is a second moving ring; 200 is a seal seat; 210 is a first stationary ring; 220 is a second stationary ring; 230 is a flange portion; 240 is a stepped hole; 250 is a spring; 260 is a lower water inlet; 270 is an upper water outlet; 280 is a flow guide sleeve; 300 is a bolt. Specific embodiments

[0020] The following are specific embodiments of the present utility model and, in conjunction with the accompanying drawings, further describe the technical solutions of the present utility model, but the present utility model is not limited to these embodiments.

[0021] As Figure 1-2 shown, a double-ended assembled mechanical seal includes: a shaft sleeve 100, a first moving ring 110 and a second moving ring 120 are fixedly connected to the shaft sleeve 100, and the first moving ring 110 and the second moving ring 120 are respectively close to both ends of the shaft sleeve 100; a seal seat 200, the seal seat 200 is sleeved on the shaft sleeve 100, a first stationary ring 210 and a second stationary ring 220 are installed in the seal seat 200, the first stationary ring 210 and the second stationary ring 220 are respectively in sealing contact with the first moving ring 110 and the second moving ring 120, the seal seat 200 is provided with a flange portion 230 for connecting with the inner wall of the pump chamber, one end of the flange portion 230 close to the shaft sleeve 100, and a plurality of bolts 300 are provided on the flange portion 230, and the bolts 300 are arranged such that their rod portions face the atmosphere side direction.

[0022] The design aims to solve the problem that traditional double-end face assembled mechanical seals can only be installed from the outside of the pump chamber, and most components are located inside the pump chamber. The shaft sleeve 100 is designed to be fixedly connected with two first dynamic rings 110 and a second dynamic ring 120. Both the first dynamic ring 110 and the second dynamic ring 120 are circumferentially fixedly connected with the shaft sleeve 100 through transmission pins. The first dynamic ring 110 and the second dynamic ring 120 are respectively located near both ends of the shaft sleeve 100. The seal seat 200 is sleeved on the shaft sleeve 100, and a first static ring 210 and a second static ring 220 are installed inside. The first static ring 210 and the second static ring 220 respectively form sealing surfaces with the first dynamic ring 110 and the second dynamic ring 120 on the shaft sleeve 100, so that there are two sealing surfaces between the shaft sleeve 100 and the seal seat 200, ensuring that there is no fluid leakage during the operation of the equipment. Among them, the flange part 230 of the seal seat 200 is used for fixedly connecting with the inner side surface of the pump chamber, and the orientation of the bolt 300 is designed such that the rod part faces the atmosphere side, that is, the rod part of the bolt 300 faces the outside of the pump chamber. This means that this mechanical seal can be installed from the inner side of the pump chamber. During installation, this mechanical seal passes through the pump chamber until the flange part 230 contacts the inner wall of the pump chamber, and then the bolt 300 is tightened. At this time, most components of the mechanical seal are located outside the pump chamber (atmosphere side).

[0023] A double-end face assembled mechanical seal capable of being installed from the inner side direction of the pump chamber is provided. The flange part 230 of the seal seat 200 can be connected with the inner wall of the pump chamber through screws, and the layout of this mechanical seal enables most of its components to be located on the atmosphere side (outside the pump chamber).

[0024] As Figure 1-2 shown, on the basis of the above embodiment, the flange part 230 is provided with a number of stepped holes 240. The number of stepped holes 240 is the same as the number of bolts and is arranged in one-to-one correspondence. The large hole part of the stepped hole 240 is arranged to be close to the medium side, and the small hole part of the stepped hole 240 is arranged to be close to the atmosphere side. The head of the bolt is located inside the large hole part of the stepped hole 240, and the rod part of the bolt is located inside the small hole part of the stepped hole 240.

[0025] In traditional mechanical seals, the rod part of the bolt 300 faces the medium side, that is, the flange structure is connected to the outer wall of the pump chamber; while in this embodiment, the rod part of the bolt 300 needs to face the atmosphere side, so that the flange part 230 is located inside the pump chamber. Based on the above requirements, the stepped hole 240 is designed such that the large hole part is close to the medium side and the small hole part is close to the atmosphere side. Therefore, the rod part of the bolt 300 can only face the atmosphere side, thus achieving the purpose of installing this mechanical seal from the inner side of the pump chamber.

[0026] As Figure 1As shown, on the basis of the above embodiments, the first stationary ring 210 and the second stationary ring 220 are arranged adjacent to each other. A number of springs 250 are also installed in the seal seat 200. Each spring 250 is arranged around the shaft sleeve 100. The two ends of the spring 250 are respectively in contact with the first stationary ring 210 and the second stationary ring 220, and the spring 250 applies a sealing pressure towards the first moving ring 110 and the second moving ring 120 to the first stationary ring 210 and the second stationary ring 220 respectively.

[0027] To ensure the continuous contact pressure between the moving ring and the stationary ring, thereby maintaining the sealing performance, a number of springs 250 are installed in the seal seat 200. The two ends of the spring 250 are respectively in contact with the first stationary ring 210 and the second stationary ring 220, and apply a sealing pressure to the first stationary ring 210 and the second stationary ring 220. These springs 250 adopt a small spring 250 design, so the provided sealing pressure is more uniform.

[0028] As Figure 1-2 shown, on the basis of the above embodiments, the seal seat 200 is provided with a lower water inlet 260 and an upper water outlet 270, and both the lower water inlet 260 and the upper water outlet 270 are communicated with the gap between the shaft sleeve 100 and the seal seat 200.

[0029] The lower water inlet 260 and the upper water outlet 270 are actually the inlet and outlet of the cleaning and cooling channel. After the mechanical seal is installed in place, the lower water inlet 260 is located below the seal seat 200, and the upper water outlet 270 is located above the seal seat 200. The main purpose of adopting this design is to avoid the mechanical seal failing due to dry running caused by accidentally closing the inlet valve. Specifically, even if the inlet valve is accidentally closed, since the water outlet is located above, the water can still remain inside the mechanical seal, thereby cooling and lubricating the moving ring and the stationary ring to a certain extent. If the water outlet is designed below, then the water will directly flow out from inside the mechanical seal, which may lead to dry running between the moving ring and the stationary ring. Such a design helps to enhance the safety and reliability of the mechanical seal and reduces the risk of equipment damage caused by human factors.

[0030] As Figure 1-2 shown, on the basis of the above embodiments, it further includes two guide sleeves 280. Both guide sleeves 280 are arranged between the shaft sleeve 100 and the seal seat 200, and there is a gap between the two guide sleeves 280. Both the lower water inlet 260 and the upper water outlet 270 are aligned with the gap between the two guide sleeves 280. The gap between the shaft sleeve 100 and the seal seat 200 forms a cleaning path through the two guide sleeves 280. The cleaning path is from the lower water inlet 260, passing through the areas where the first moving ring 110 and the first stationary ring 210 are located, the areas where the second moving ring 120 and the second stationary ring 220 are located, and discharging through the upper water outlet 270.

[0031] The flow guide sleeve 280 divides the gap between the shaft sleeve 100 and the seal seat 200 into an outer channel and an inner channel, and the inner channel and the outer channel communicate with the area where the dynamic ring and the static ring are located. The cleaning liquid enters the outer channel from the lower water inlet 260, then enters the area where the first dynamic ring 110 and the first static ring 210 are located to cool and wash the first dynamic ring 110 and the first static ring 210, then enters the area where the second dynamic ring 120 and the second static ring 220 are located to cool and wash the second dynamic ring 120 and the second static ring 220, and finally discharges from the upper water outlet 270.

[0032] On the basis of the above embodiments, auxiliary sealing rings are provided between the inner peripheral surface of the shaft sleeve 100, between the shaft sleeve 100 and the first dynamic ring 110, between the shaft sleeve 100 and the second dynamic ring 120, between the seal seat 200 and the first static ring 210, and between the seal seat 200 and the second static ring 220.

[0033] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0034] In addition, in the present invention, descriptions such as "first", "second", "one", etc. are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0035] In the present invention, unless otherwise clearly specified and limited, terms such as "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. 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 circumstances.

[0036] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

Claims

1. A double-ended assembled mechanical seal, characterized in that, Comprising: A bushing (100), a first moving ring (110) and a second moving ring (120) are fixedly connected to the bushing (100), and the first moving ring (110) and the second moving ring (120) are respectively close to two ends of the bushing (100); A seal seat (200), the seal seat (200) is sleeved on the bushing (100), a first stationary ring (210) and a second stationary ring (220) are installed in the seal seat (200), the first stationary ring (210) and the second stationary ring (220) are respectively in sealing contact with the first moving ring (110) and the second moving ring (120), the seal seat (200) is provided with a flange portion (230) for connecting with the inner wall of the pump chamber, one end of the flange portion (230) is close to the bushing (100), and a plurality of bolts (300) are arranged on the flange portion (230), and the bolts (300) are arranged such that their rod portions face the atmosphere side direction.

2. The double-ended assembled mechanical seal according to claim 1, characterized in that: A plurality of stepped holes (240) are formed in the flange portion (230), the number of the stepped holes (240) is the same as and corresponds one-to-one to the number of the bolts (300), the large hole portions of the stepped holes (240) are arranged to be close to the medium side, the small hole portions of the stepped holes (240) are arranged to be close to the atmosphere side, the heads of the bolts (300) are located in the large hole portions of the stepped holes (240), and the rod portions of the bolts (300) are located in the small hole portions of the stepped holes (240).

3. The double-ended face integrated mechanical seal according to claim 1, characterized in that: The first stationary ring (210) and the second stationary ring (220) are arranged adjacent to each other, and a plurality of springs (250) are also installed in the seal seat (200), each of the springs (250) is arranged around the bushing (100), and two ends of the spring (250) are respectively in contact connection with the first stationary ring (210) and the second stationary ring (220), and the springs (250) respectively apply sealing pressure towards the first moving ring (110) and the second moving ring (120) to the first stationary ring (210) and the second stationary ring (220).

4. The double-end face assembled mechanical seal according to claim 1, characterized in that: The seal seat (200) is provided with a lower water inlet (260) and an upper water outlet (270), and both the lower water inlet (260) and the upper water outlet (270) are communicated with the gap between the bushing (100) and the seal seat (200).

5. The double-ended surface assembled mechanical seal according to claim 4, characterized in that: It further includes two flow guiding sleeves (280). Both of the two flow guiding sleeves (280) are arranged between the shaft sleeve (100) and the seal seat (200), and there is a gap between the two flow guiding sleeves (280). The lower water inlet (260) and the upper water outlet (270) are both aligned with the gap between the two flow guiding sleeves (280). A cleaning path is formed through the two flow guiding sleeves (280) at the gap between the shaft sleeve (100) and the seal seat (200). The cleaning path is from the lower water inlet (260), passing through the areas where the first dynamic ring (110) and the first static ring (210) are located, the areas where the second dynamic ring (120) and the second static ring (220) are located in sequence, and discharging through the upper water outlet (270).

6. A double-ended assembled mechanical seal according to any one of claims 1-5, characterized in that: Auxiliary sealing rings are arranged between the inner peripheral surface of the shaft sleeve (100), between the shaft sleeve (100) and the first dynamic ring (110), between the shaft sleeve (100) and the second dynamic ring (120), between the seal seat (200) and the first static ring (210), and between the seal seat (200) and the second static ring (220).

Images