Water-cooling nodular cast iron pipe centrifugal machine

Abstract

The utility model relates to the technical field of centrifugal machine cooling, in particular to a water cooling type nodular cast iron pipe centrifugal machine which comprises a centrifugal machine shell and a pipe die arranged in the centrifugal machine shell, and a spray cooling assembly located above the pipe die is arranged at the top end in the centrifugal machine shell. The centrifugal machine shell is provided with a high-position water outlet pipe opening and a low-position water outlet pipe opening which are used for controlling the cooling water level in the centrifugal machine shell, the high-position water outlet pipe opening is formed above the bottom end face of the pipe die, a distance is reserved between the high-position water outlet pipe opening and the bottom end face of the pipe die, and the low-position water outlet pipe opening is formed below the bottom end face of the pipe die. And valves are arranged on the high-position water outlet pipe orifice and the low-position water outlet pipe orifice. The water level is controlled through cooperation of the spray cooling assembly, the high-position water outlet pipe opening and the low-position water outlet pipe opening, different cooling modes and the whole cooling process are achieved when different pipe molds have different temperatures, the thermal stress of the pipe molds is effectively reduced, and the service life of the pipe molds is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifuge cooling, in particular to a water-cooled ductile iron pipe centrifuge. Background Art

[0002] During the production process of small and medium-sized ductile iron pipes, molten iron flows into a high-speed rotating mold, where it adheres to the inner surface of the circular mold through centrifugal force and takes shape. Simultaneously, circulating water is evenly sprayed onto the outer surface of the mold through a spray tube bundle. This evaporation of water absorbs heat, rapidly removing heat from the mold and reducing its temperature. Because the inner surface of the mold is hot molten iron, while the outer surface is rapidly cooled by water, this temperature difference causes thermal stress that severely impacts the mold's service life. Rapid temperature fluctuations subject the mold material to frequent cycles of tension and compression, making it susceptible to cracking and fatigue damage. Over time, these thermal stresses can exceed the mold material's strength limit, causing internal cracks and shortening its overall service life. This also increases equipment maintenance and repair costs. Utility Model Content

[0003] The utility model provides a water-cooled ductile iron pipe centrifuge to solve the technical problem in the prior art that when the pipe mould is cooled, the pipe mould is subjected to great thermal stress, which affects the overall service life.

[0004] In order to solve the above problems, the utility model provides a water-cooled ductile iron pipe centrifuge adopting the following technical solutions:

[0005] The centrifuge shell comprises a centrifuge shell and a pipe mold arranged in the centrifuge shell. The inner top of the centrifuge shell is provided with a spray cooling assembly located above the pipe mold. The centrifuge shell is provided with a high-level water outlet and a low-level water outlet for controlling the cooling water level in the centrifuge shell. The high-level water outlet is arranged above the bottom end surface of the pipe mold and a distance is left between the high-level water outlet and the bottom end surface of the pipe mold. The low-level water outlet is arranged below the bottom end surface of the pipe mold. Valves are provided on both the high-level water outlet and the low-level water outlet.

[0006] Furthermore, the distance between the bottom end surface of the high-position water outlet and the bottom of the pipe mold is L1, and L1 is 10cm-15cm.

[0007] Furthermore, the distance between the upper end surface of the low-position water outlet and the bottom end surface of the pipe mold is L2, and L2 is 10cm-15cm.

[0008] Furthermore, the spray cooling assembly includes a spray pipe arranged in a horizontal line, a spray head is provided on the lower end surface of the spray pipe, and a water inlet pipe is connected to the spray pipe. The water inlet pipe passes through the top wall of the centrifuge housing and is connected to the outside.

[0009] Furthermore, there are a plurality of spray heads which are evenly spaced and arranged on the spray pipe.

[0010] Furthermore, the water inlet pipe is arranged in the middle of the spray pipe, and the inner diameter of the water inlet pipe is larger than the inner diameter of the spray pipe.

[0011] The beneficial effects of the present invention are as follows: during specific use, the spray cooling component is first sprayed for cooling, and at the same time, the sprayed water is discharged through the low-level water outlet pipe. When the temperature of the pipe mold is lower than 300°C, the low-level water outlet pipe is closed and the high-level water outlet pipe is opened at the same time. At this time, it is sprayed and immersed in the low position for cooling. When the temperature of the pipe mold is lower than 100°C, the spraying is stopped and only the low-level immersion is used for slow cooling. The water level is controlled by the spray cooling component and the high-level water outlet pipe and the low-level water outlet pipe as a whole. Different cooling methods are realized at different temperatures of different pipe molds. The overall cooling process effectively reduces the thermal stress of the pipe mold and increases the service life of the pipe mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0013] Figure 1 This is a schematic diagram of a water-cooled ductile iron pipe centrifuge according to the present invention;

[0014] Figure 2 This is a specific orientation diagram of the high-position water outlet, low-position water outlet and pipe mold in the utility model.

[0015] Description of reference numerals:

[0016] 1. Centrifuge housing; 11. High-position water outlet; 12. Low-position water outlet; 2. Pipe mold; 3. Spray cooling assembly; 31. Spray pipe; 32. Spray head; 33. Water inlet pipe. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0018] Any number of elements in the drawings is for illustration and not limitation, and any naming is for distinction only and does not have any limiting meaning.

[0019] The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0020] The utility model provides a water-cooled ductile iron pipe centrifuge embodiment:

[0021] like Figures 1 to 2 As shown, it includes a centrifuge housing 1 and a pipe mold 2 arranged in the centrifuge housing 1. The inner top of the centrifuge housing 1 is provided with a spray cooling assembly 3 located above the pipe mold 2. The centrifuge housing 1 is provided with a high-level water outlet pipe 11 and a low-level water outlet pipe 12 for controlling the cooling water level in the centrifuge housing 1. The high-level water outlet pipe 11 is provided above the bottom end surface of the pipe mold 2 and a distance is left between the high-level water outlet pipe 11 and the bottom end surface of the pipe mold 2. The low-level water outlet pipe 12 is provided below the bottom end surface of the pipe mold 2. Valves are provided on both the high-level water outlet pipe 11 and the low-level water outlet pipe 12.

[0022] Among them, the setting of the high-level water outlet 11 and the low-level water outlet 12 allows the cooling water level in the centrifuge housing 1 to be flexibly controlled as needed. By adjusting the valves on the two water outlets, the amount of cooling water can be accurately controlled to meet the needs of different cooling stages.

[0023] In this embodiment, the distance between the bottom end surface of the high-position water outlet 11 and the bottom of the pipe mold 2 is L1, and L1 is 13 cm.

[0024] This spacing ensures that when the temperature of the tube mold 2 falls below 300°C, the cooling water can submerge the bottom of the tube mold 2, achieving water immersion cooling. Proper water immersion cooling helps reduce thermal stress generated during the rapid cooling of the tube mold 2. Once the temperature of the tube mold 2 drops to an appropriate range, water immersion cooling further eliminates residual thermal stress, thereby protecting the tube mold from damage and extending its service life.

[0025] In this embodiment, the distance between the upper end surface of the low-position water outlet 12 and the bottom end surface of the pipe mold 2 is L2, and L2 is 11 cm.

[0026] There is a gap between the low-level water outlet 12 and the bottom end of the pipe mold 2 to prevent the water level from rising and contacting the pipe mold 2 when the collected water is greater than the discharged water.

[0027] In this embodiment, the spray cooling assembly 3 includes a spray pipe 31 arranged horizontally, a spray head 32 is provided on the lower end surface of the spray pipe 31, and a water inlet pipe 33 is connected to the spray pipe 31. The water inlet pipe 33 passes through the top wall of the centrifuge housing 1 and is connected to the outside, and a valve is provided on the water inlet pipe 33.

[0028] There are multiple spray heads 32 that are evenly spaced apart on the spray pipe 31 .

[0029] The water inlet pipe 33 is disposed in the middle of the spray pipe 31 , and the inner diameter of the water inlet pipe 33 is larger than the inner diameter of the spray pipe 31 .

[0030] Specifically, the inner diameter of the water inlet pipe 33 is larger than the inner diameter of the spray pipe 31 , which helps to ensure that cooling water can be adequately supplied to the spray pipe 31 , thereby maintaining the stability and reliability of the spray cooling system.

[0031] During specific use, high-temperature molten iron flows into the pipe mold 2. Due to the high-speed rotation of the pipe mold 2, the molten iron adheres to the inner wall surface of the pipe mold 2 due to the action of centrifugal force. At the same time, cooling water enters from the water inlet pipe 33 and is sprayed onto the outer surface of the pipe mold 2 through the spray head 32. The water flow cools the outer surface of the pipe mold 2; at the same time, the valve on the low-level water outlet pipe 12 is opened, and the water collected on the bottom surface of the centrifuge housing 1 is discharged through the low-level water outlet pipe 12.

[0032] After the molten iron in the tube mold 2 solidifies and the temperature is less than 300°C, the valve on the low-level water outlet pipe 12 is closed, and the valve on the high-level water outlet pipe 11 is opened at the same time, so that the water level collected on the bottom surface of the centrifuge housing 1 rises. When the water level exceeds the high-level water outlet pipe 11, water will be discharged through the high-level water outlet pipe 11 to maintain the water level on the bottom surface of the centrifuge housing 1, so that the lower part of the tube mold 2 is immersed in water for cooling.

[0033] When the temperature of the iron pipe formed after the molten iron in the pipe mold 2 solidifies is less than 100° C., the valve on the water inlet pipe 33 is closed to prevent cooling water from entering.

[0034] At this time, only the lower part of the pipe mold 2 is immersed in water to slowly cool down. The overall cooling process effectively reduces the thermal stress of the pipe mold 3 and increases the service life of the pipe mold 2.

[0035] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "width", "horizontal", "top", "bottom", "inside", "outside" and other terms indicating orientation or positional relationships are based on the orientation or positional relationships shown in the drawings of this specification. They are only for the purpose of facilitating the explanation of the scheme of the utility model and simplifying the description, rather than explicitly or implicitly indicating that the devices or elements involved must have the specific orientation, be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms cannot be understood or interpreted as limitations on the scheme of the utility model.

[0036] In addition, in the description of this specification, “a plurality of” means at least two, for example, two, three or more, etc., unless otherwise clearly and specifically defined.

Claims

1. A water-cooled ductile iron pipe centrifuge, comprising a centrifuge housing (1) and a pipe mold (2) disposed in the centrifuge housing (1), characterized in that: The top end of the centrifuge housing (1) is provided with a spray cooling assembly (3) located above the pipe mold (2); the centrifuge housing (1) is provided with a high-level water outlet (11) and a low-level water outlet (12) for controlling the cooling water level in the centrifuge housing (1); the high-level water outlet (11) is provided above the bottom end surface of the pipe mold (2) and a distance is left between the high-level water outlet (11) and the bottom end surface of the pipe mold (2); the low-level water outlet (12) is provided below the bottom end surface of the pipe mold (2); and valves are provided on both the high-level water outlet (11) and the low-level water outlet (12).

2. The water-cooled ductile iron pipe centrifuge according to claim 1, characterized in that: The distance between the bottom end surface of the high-position water outlet (11) and the bottom of the pipe mold (2) is L1, and L1 is 10cm-15cm.

3. The water-cooled ductile iron pipe centrifuge according to claim 1, characterized in that: The distance between the upper end surface of the low-position water outlet (12) and the bottom end surface of the pipe mold (2) is L2, and L2 is 10cm-15cm.

4. The water-cooled ductile iron pipe centrifuge according to claim 3, characterized in that: The spray cooling assembly (3) comprises a spray pipe (31) arranged in a horizontal line, a spray head (32) being provided on the lower end surface of the spray pipe (31), and a water inlet pipe (33) being connected to the spray pipe (31), the water inlet pipe (33) penetrating the top wall of the centrifuge housing (1) and being connected to the outside.

5. The water-cooled ductile iron pipe centrifuge according to claim 4, characterized in that: There are a plurality of spray heads (32) which are evenly spaced and arranged on the spray pipe (31).

6. The water-cooled ductile iron pipe centrifuge according to claim 4, characterized in that: The water inlet pipe (33) is arranged in the middle of the spray pipe (31), and the inner diameter of the water inlet pipe (33) is larger than the inner diameter of the spray pipe (31).

Images