Centrifugal pump mechanical sealing structure suitable for refrigerating fluid working condition

Abstract

The utility model relates to the field of centrifugal pumps, in particular to a centrifugal pump mechanical sealing structure suitable for a refrigerating fluid working condition, a movable ring is fixedly sleeved on a pump shaft, and a detachable contact surface is assembled on the movable ring; mounting columns are fixedly arranged on the two sides of the contact face, clamping pieces are movably arranged on the two sides of each mounting column, mounting cavities are formed in the positions, corresponding to the mounting columns, of the movable ring in a matched mode, and clamping cavities are formed in the positions, corresponding to the clamping pieces, of the two sides of each mounting cavity in a matched mode. According to the utility model, the movable ring and the contact surface are arranged into a modular structure, so that when the contact surface is embrittled, only the contact surface needs to be replaced, and the movable ring does not need to be wholly replaced, so that the maintenance cost of the device under the working condition of refrigerating fluid is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to centrifugal pump technical field especially suitable for frozen liquid working condition centrifugal pump mechanical seal structure. BACKGROUND

[0002] Centrifugal pump mechanical seal structure refers to the device that prevents fluid leakage by at least a pair of end faces (moving ring and static ring) perpendicular to the rotation axis, under the action of fluid pressure and compensation mechanism elastic force (or magnetic force) and the cooperation of auxiliary seal, keeps in close contact and relative sliding.

[0003] Under the frozen liquid working condition, the surface of the moving ring that contacts the frozen liquid will be continuously affected by low temperature, which will cause the surface of the moving ring to become brittle, resulting in a decrease in material strength and toughness, and thus affecting the sealing effect, so the moving ring needs to be replaced as a whole regularly. However, under the frozen liquid working condition, only the surface of the moving ring that contacts the frozen liquid will become brittle, and the replacement of the moving ring as a whole wastes resources and increases the maintenance cost of the centrifugal pump mechanical seal structure. SUMMARY

[0004] The utility model discloses a centrifugal pump mechanical seal structure suitable for frozen liquid working condition is provided to solve the shortcoming in prior art.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] The centrifugal pump mechanical seal structure suitable for frozen liquid working condition includes a pump shaft and a moving ring, the moving ring is fixedly sleeved on the pump shaft, and a detachable contact surface is assembled on the moving ring; installation columns are fixedly arranged on the two sides of the contact surface, clamping pieces are movably arranged on the two sides of the installation columns, installation cavities are formed in the moving ring corresponding to the installation columns, and clamping cavities are formed in the two sides of the installation cavities corresponding to the clamping pieces.

[0007] In addition, preferably, the two sides of the installation column are inwardly provided with movable cavities, and the clamping pieces are movably arranged in the movable cavities.

[0008] In addition, preferably, a plurality of springs are outwardly arranged in the movable cavities, and the other ends of the springs are connected with the clamping pieces.

[0009] In addition, preferably, a connecting cavity is formed in one side of the installation column corresponding to the movable cavity, and the connecting cavities are arranged on the surface of the contact surface.

[0010] In addition, preferably, a connecting plate is fixedly arranged on the clamping piece, the other end of the connecting plate is arranged outside the connecting cavity and fixedly connected with a push plate.

[0011] In addition, a preferred structure is that multiple guide posts are fixedly installed in each of the connecting cavities, and the connecting plates are guided to move by the guide posts.

[0012] The beneficial effects of this utility model are as follows: by setting the dynamic ring and the contact surface into a modular structure, when the contact surface becomes brittle, only the contact surface needs to be replaced, without having to replace the entire dynamic ring, thereby reducing the maintenance cost of this device under refrigerant conditions. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the mechanical seal structure for centrifugal pumps suitable for refrigerant conditions proposed in this utility model;

[0014] Figure 2 This is a schematic diagram of the dynamic ring and contact surface of the mechanical seal structure for a centrifugal pump suitable for refrigerant conditions proposed in this utility model;

[0015] Figure 3 for Figure 2 A schematic diagram of the structure during the removal of the contact surface;

[0016] Figure 4 This is a schematic diagram of the internal structure of the mounting cavity and the retaining cavity of the mechanical seal structure for centrifugal pumps under refrigerant conditions proposed in this utility model;

[0017] Figure 5 This is a schematic diagram of the back structure of the contact surface of the mechanical seal structure for centrifugal pumps under refrigerant conditions proposed in this utility model.

[0018] Figure 6 This is a schematic diagram of the internal structure of the movable cavity and connecting cavity of the mechanical seal structure for a centrifugal pump suitable for refrigerant conditions proposed in this utility model.

[0019] Figure 7 This is a schematic diagram of the clamp, connecting plate, and push plate of the mechanical seal structure for centrifugal pumps operating under refrigerant conditions proposed in this utility model.

[0020] In the diagram: 1 Pump shaft, 2 Moving ring, 21 Mounting cavity, 22 Clamping cavity, 3 Contact surface, 301 Movable cavity, 302 Connecting cavity, 31 Mounting column, 32 Clamping piece, 321 Connecting plate, 322 Push plate, 33 Guide column, 34 Spring. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] Reference Figures 1-7, suitable for the mechanical seal structure of centrifugal pump in frozen liquid working condition, including pump shaft 1 and dynamic ring 2, the pump shaft 1 is fixedly sleeved with the installation of dynamic ring 2, and the dynamic ring 2 is assembled with the detachable contact surface 3. The both sides of the contact surface 3 are fixedly provided with mounting columns 31, the both sides of the mounting column 31 are movably provided with clamping pieces 32, the dynamic ring 2 is correspondingly provided with mounting cavities 21, and the both sides of the mounting cavity 21 are correspondingly provided with clamping cavities 22.

[0023] Wherein, the dynamic ring 2 is fixedly installed on the pump shaft 1 by interference fit, the static ring is in contact with the dynamic ring 2, which is under the action of fluid pressure and compensation mechanism elastic force (or magnetic force) and the cooperation of auxiliary seal (such as O ring, etc.), keeps close and relative sliding to constitute the device for preventing fluid leakage. It is worth noting that the dynamic ring 2 is a component in the mechanical seal structure of centrifugal pump, the specific structure of pump shaft 1, dynamic ring 2 and centrifugal pump mechanical seal structure and its working mode are all prior art, so they are not described in detail in the utility model.

[0024] Wherein, the both sides of the mounting column 31 are inwardly provided with movable cavities 301, and the clamping pieces 32 are movably located in the movable cavities 301. A plurality of springs 34 are installed outwardly in the movable cavities 301, and the other ends of the springs 34 are connected with the clamping pieces 32. Through the setting of the spring 34, the clamping piece 32 can be pushed outwards, so that the clamping piece 32 can be stably pushed into the clamping cavity 22.

[0025] Wherein, the mounting column 31 is communicated with the connecting cavity 302 on one side of the movable cavity 301, and the connecting cavity 302 is outwardly extended from the surface of the contact surface. The connecting plate 321 is fixedly arranged on the clamping piece 32, and the other end of the connecting plate 321 is outwardly extended from the connecting cavity 302 and fixedly connected with the push plate 322. The push plate 322 is paved with a sealing sleeve, and the push plate 322 is provided to prevent the frozen liquid from entering the movable cavity 301 from the connecting cavity 302, so as to improve the service life of the contact surface 3.

[0026] Wherein, a plurality of guide columns 33 are fixedly arranged in the connecting cavity 302, and the connecting plate 321 is guided to move through the guide column 33. Through the setting of the guide column 33, the stability of the connecting plate 321 in the moving process can be improved.

[0027] In this embodiment, the dynamic ring 2 and the contact surface 3 are set as a modular structure, so that when the contact surface 3 is brittle, only the contact surface 3 needs to be replaced, without the need to replace the dynamic ring 2 as a whole, so as to reduce the maintenance cost of the device.

[0028] Further, when the user needs to install the contact surface 3 on the dynamic ring 2, the mounting column 31 on the contact surface 3 is inserted into the mounting cavity 21 on the dynamic ring 2.

[0029] Because the wedge-shaped card 32 is arranged, and the slope of the card 32 is towards the installation cavity 31, during the installation of the installation column 31, the card 32 can be automatically moved into the movable cavity 301, and the spring 34 is compressed. When the installation column 31 is completely inserted into the installation cavity 21, the card 32 is aligned with the card cavity 22, at this time the card 32 can be pushed into the card cavity 22 by the elastic force of the spring 34, so that the fixed installation of the contact surface 3 can be realized by the mutual clamping between the card 32 and the card cavity 22.

[0030] Further, when the user removes the contact surface 3 in the later stage, only need to pinch the two push plates 322 on both sides of the contact surface 3 to the middle, so that the connecting plate 321 and the card 32 can be moved by the push plate 322, so that the card 32 can be moved into the movable cavity 301, and the spring 34 is compressed. At this time, the card 32 is no longer clamped in the card cavity 22, the user can directly pull out the installation column 31 from the installation cavity 21, so that the contact surface 3 can be removed.

[0031] In the utility model, the modular structure is arranged between the moving ring 2 and the contact surface 3, so that when the contact surface 3 is brittle, the contact surface 3 can be replaced, and the moving ring 2 does not need to be replaced as a whole, so that the maintenance cost of the device under the working condition of the refrigerated liquid is reduced.

[0032] The above is only the preferred embodiment of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can replace or change according to the technical scheme and the utility model concept of the utility model within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model.

Claims

1. A mechanical seal structure for a centrifugal pump used in a refrigerant working condition, comprising a pump shaft (1) and a running ring (2), characterized in that, The pump shaft (1) is fixedly sleeved with a movable ring (2), and the movable ring (2) is assembled with a detachable contact surface (3); Both sides of the contact surface (3) are fixedly provided with mounting columns (31), both sides of the mounting column (31) are movably provided with clamping pieces (32), the movable ring (2) is correspondingly provided with mounting cavities (21) on both sides of the mounting column (31), and the mounting cavities (21) are correspondingly provided with clamping cavities (22) on both sides of the clamping piece (32).

2. The mechanical seal structure for a centrifugal pump suitable for a refrigerant fluid service as defined in claim 1, wherein Both sides of the mounting column (31) are movably provided with movable cavities (301) inwardly, and the clamping pieces (32) are movably arranged in the movable cavities (301).

3. The mechanical seal structure for a centrifugal pump suitable for a refrigerant fluid service as defined in claim 2, wherein A plurality of springs (34) are installed outwardly in the movable cavities (301), and the other ends of the springs (34) are connected with the clamping pieces (32).

4. The mechanical seal arrangement for a centrifugal pump suitable for cryogenic liquid service of claim 2, wherein, The mounting column (31) is communicated with a connecting cavity (302) on one side of the movable cavity (301), and the connecting cavities (302) are arranged on the surface of the contact surface.

5. The mechanical seal structure for a centrifugal pump suitable for cryogenic liquid service as defined in claim 4, wherein, The clamping pieces (32) are fixedly provided with connecting plates (321), and the other ends of the connecting plates (321) are arranged outside the connecting cavities (302) and fixedly connected with push plates (322).

6. The mechanical seal structure for a centrifugal pump suitable for cryogenic liquid service of claim 5, wherein, A plurality of guide columns (33) are fixedly arranged in the connecting cavities (302), and the connecting plates (321) are guided to move through the guide columns (33).

Images