Cooling device for THF wastewater pumping machine of polyester device

Abstract

The utility model discloses a cooling device for a THF waste water pumping machine of a polyester device, which comprises a mechanical sealing ring, a shaft sealing tank connected with the mechanical sealing ring through a water supply pipe and a water return pipe, and a cooling structure arranged on the water return pipe, and a separation structure is arranged between the shaft seal liquid flow channel in the mechanical seal ring and the spring. And by arranging the separation structure and circulating shaft sealing liquid, the operation stability of the mechanical sealing structure is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pump cooling structures, in particular to a THF wastewater pump cooling device for a polyester device. Background Art

[0002] The THF device is an important subsidiary position in the PBAT production device, in which the wastewater pump is an important equipment for tail gas treatment in THF, and plays a vital role in the system wastewater recycling and tail gas treatment. The existing PBAT device THF wastewater pumps all use centrifugal pumps, and the centrifugal pumps use double-end mechanical seals, and the cooling medium uses circulating water. The disadvantages are: the temperature of the process medium wastewater is relatively high, which causes the shaft seal liquid (circulating water) of the mechanical seal to scale easily, resulting in failure of the spring of the mechanical seal, thereby causing the mechanical seal to leak. The leaked medium contains trace amounts of THF, which not only poses environmental risks, but also safety risks. Summary of the invention

[0003] The technical problem to be solved by the utility model is that the sealing structure of a centrifugal pump is prone to sealing failure due to scaling of the shaft sealing fluid at high temperature.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a cooling device for a THF wastewater pump of a polyester device, including a mechanical sealing ring, a shaft sealing tank connected to the mechanical sealing ring through a water supply pipe and a return pipe, and a cooling structure arranged on the return pipe, a spring is arranged in the mechanical sealing ring for squeezing the sealing ring, and a separation structure is arranged between the shaft sealing liquid flow channel in the mechanical sealing ring and the spring.

[0005] Preferably, the shaft sealing tank contains dimethyl silicone oil.

[0006] Preferably, the inner ring of the mechanical sealing ring is provided with an annular cavity, the sealing rings are distributed on the two inner end walls of the annular cavity, the spring is located between the two sealing rings, the spring is in a compressed state, and the separation structure is a separation ring connected between the outer walls of the two sealing rings.

[0007] Preferably, annular protrusions are provided at opposite ends of the two sealing rings, and the end of the separation ring is buckled on the annular protrusions.

[0008] Preferably, an annular heat exchange protrusion and a connecting plate are fixedly provided on the outer side wall of the separating ring. The connecting plate is located at the end of the separating ring. An opening is provided on the connecting plate. A heat exchange rod is provided between the two connecting plates. The heat exchange protrusions are equidistantly distributed along the axial direction of the separating ring.

[0009] 1. The utility model provides a THF wastewater pump cooling device for a polyester device. The spring inside the mechanical seal ring is separated by a separation ring to form a heat exchange cavity and a sealing space, thereby avoiding contact between the shaft seal liquid and the spring, thereby avoiding damage to the spring caused by scaling of the shaft seal liquid in the mechanical seal ring.

[0010] 2. The shaft seal tank is connected to the mechanical seal ring through the water supply pipe and the return pipe to supply the shaft seal liquid to the inside of the mechanical seal ring. In the process of conveying the shaft seal liquid, the circulating shaft seal liquid is cooled by the cooling structure to ensure the heat exchange efficiency inside the mechanical seal ring and keep the seal ring at a lower temperature.

[0011] 3. Dimethyl silicone oil is used as the shaft seal liquid. In a high temperature environment, the shaft seal liquid will not scale, and the mechanical seal ring will operate normally, thus avoiding leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0013] Figure 1 It is a structural schematic diagram of an embodiment of the utility model.

[0014] Figure 2 It is a schematic diagram of the structure of the shaft sealing tank in the embodiment of the utility model.

[0015] Figure 3 It is a cross-sectional view of the mechanical seal ring in the embodiment of the utility model.

[0016] In the figure: 1. Mechanical sealing ring; 2. Shaft sealing tank; 3. Water supply pipe; 4. Return pipe; 5. Heat exchange tube; 11. Sealing ring; 12. Separation ring; 13. Spring; 14. Connecting piece; 15. Heat exchange rod. DETAILED DESCRIPTION

[0017] like Figure 1-3 As shown, the utility model provides a cooling device for a THF wastewater pump of a polyester device, comprising a mechanical sealing ring 1, a shaft sealing tank 2 connected to the mechanical sealing ring 1 through a water supply pipe 3 and a return pipe 4, and a cooling structure arranged on the return pipe 4, a spring 13 squeezed by the sealing ring 11 is arranged in the mechanical sealing ring 1, and a separation structure is arranged between the shaft sealing liquid flow channel in the mechanical sealing ring 1 and the spring 13.

[0018] The mechanical seal ring 1 is sealed by the inner ring seal 11. Before the pump is started, the discharge valve of the shaft seal tank 2 is opened, and the liquid supply pump on the water supply pipe 3 is turned on. The water supply pipe 3 conveys the shaft seal liquid to the mechanical seal ring 1. By continuously conveying the shaft seal liquid and exchanging heat with the inside of the mechanical seal ring 1, the internal temperature of the mechanical seal ring 1 is reduced, and the stability of the seal ring 11 is maintained. The shaft seal liquid after heat exchange enters the shaft seal tank 2 through the return pipe 4 and the cooling structure, thereby realizing the circulation of the shaft seal liquid.

[0019] The cooling structure is a heat exchange tube 5 fixedly installed on the top of the shaft sealing tank 2. The heat exchange tube 5 is placed inside the water tank to exchange heat with the circulating water. The shaft sealing liquid after heat exchange enters the shaft sealing tank 2 and circulates again.

[0020] As a preferred embodiment of the present invention, the shaft sealing tank 2 contains dimethyl silicone oil.

[0021] like Figure 3 The inner ring of the mechanical seal ring 1 is provided with an annular cavity, the seal rings 11 are distributed on the two inner end walls of the annular cavity, the spring 13 is located between the two seal rings 11, the spring 13 is in a compressed state, and the separation structure is a separation ring 12 connected between the outer walls of the two seal rings 11.

[0022] The two sealing rings 11 are pushed tightly onto the two ends of the annular cavity of the mechanical sealing ring 1 by the spring 13 to ensure the sealing of the edges. The separation structure prevents the shaft sealing fluid from contacting the spring 13 .

[0023] like Figure 3 The opposite ends of the two sealing rings 11 are provided with annular protrusions, and the end of the separation ring 12 is buckled on the annular protrusions.

[0024] The sealing ring 11 is pushed outward by the spring 13 and buckled inward by the separation ring 12, so that the sealing ring 11 is stably installed, and the separation ring 12 is in close contact with the sealing ring 11, so that heat exchange can be performed effectively.

[0025] like Figure 3 As shown, in order to enhance the heat exchange capacity of the separation ring 12, an annular heat exchange protrusion and a connecting piece 14 are fixedly provided on the outer wall of the separation ring 12, the connecting piece 14 is located at the end of the separation ring 12, an opening is provided on the connecting piece 14, a heat exchange rod 15 is provided between the two connecting pieces 14, and the heat exchange protrusions are equidistantly distributed along the axial direction of the separation ring 12.

[0026] The connecting piece 14 is arc-shaped, and is installed in the mechanical seal ring 1 after two connecting pieces 14 are assembled to form an annular structure; the heat exchange rod 15 is arranged along the axial direction to ensure the installation strength of the connecting piece 14. At the same time, the connecting piece 14 and the heat exchange rod 15 can increase the contact area between the separation ring 12 and the shaft sealing liquid, thereby improving the heat exchange efficiency.

Claims

1. A THF wastewater pump cooling device for a polyester device, characterized in that: The invention comprises a mechanical seal ring (1), a shaft seal tank (2) connected to the mechanical seal ring (1) via a water supply pipe (3) and a water return pipe (4), and a cooling structure arranged on the water return pipe (4); a spring (13) is arranged in the mechanical seal ring (1) and is pressed by a seal ring (11); and a separation structure is arranged between a shaft seal liquid flow channel in the mechanical seal ring (1) and the spring (13).

2. A THF wastewater pump cooling device for a polyester device as claimed in claim 1, characterized in that: The shaft sealing tank (2) contains dimethyl silicone oil.

3. A THF wastewater pump cooling device for a polyester device as claimed in claim 1, characterized in that: The inner ring of the mechanical seal ring (1) is provided with an annular cavity, the seal rings (11) are distributed on the two inner end walls of the annular cavity, the spring (13) is located between the two seal rings (11), the spring (13) is in a compressed state, and the separation structure is a separation ring (12) connected between the outer walls of the two seal rings (11).

4. A THF wastewater pump cooling device for a polyester device as claimed in claim 3, characterized in that: An annular protrusion is provided at the opposite ends of the two sealing rings (11), and the end of the separation ring (12) is buckled on the annular protrusion.

5. A THF wastewater pump cooling device for a polyester device as claimed in claim 3, characterized in that: An annular heat exchange protrusion and a connecting sheet (14) are fixedly provided on the outer side wall of the separation ring (12); the connecting sheet (14) is located at the end of the separation ring (12); an opening is provided on the connecting sheet (14); a heat exchange rod (15) is provided between the two connecting sheets (14); and the heat exchange protrusions are equidistantly distributed along the axial direction of the separation ring (12).

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