Vertical multi-stage centrifugal pump employing can having double-wall structure to prevent freezing and bursting

Abstract

The present invention relates to a vertical multi-stage centrifugal pump employing can having a double-wall structure to prevent freezing and bursting, wherein a cylindrical can (20) and stages (30) stacked in multiple layers are mounted on a lower casing (10) having an inlet (11) and an outlet (12), respectively, the stages (30) stacked in multiple layers are arranged inside the can (20), a flow path (40) is formed between the stages (30) stacked in multiple layers and the can (20), an upper casing (45) is mounted on the upper end of the can (20), an impeller (310) and a diffuser (320) are arranged inside each stage (30), a driving shaft (55) and a rotary shaft (60) of a motor (50) are connected by a coupling (65), an impeller (310) is coupled to the rotary shaft (60), and the impeller (310) is rotated in the stage (30) by the rotary shaft (60). The can (20) comprises an inner can (21) and an outer can (22), the outer can (22) is disposed outside the inner can (21), and the can has double structures including the inner can (21), the outer can (22), and a space (23) formed therebetween.

Description

Vertical multi-stage centrifugal pump with double-structured can to prevent freezing

[0001] The present invention relates to a vertical multistage centrifugal pump using a double-structured can for freezing prevention, and more specifically, to a vertical multistage centrifugal pump using a double-structured can for freezing prevention, wherein the can is formed as a double structure in which an inner can and an outer can are formed and a space is arranged between the inner can and the outer can.

[0002]

[0003] Korean Patent No. 10-0897477 (registered on May 6, 2009) introduces “Inverter booster pump for freezing prevention and method for freezing prevention in inverter booster pump.”

[0004] The above-mentioned freeze-prevention inverter booster pump comprises: a rectifier for converting AC power supplied from an input power source into DC power; a smoothing capacitor for smoothing the DC power rectified by the rectifier; an inverter for converting the DC power smoothed by the smoothing capacitor into AC power of variable frequency and variable voltage by receiving a signal from a PWM generator; a current sensor for detecting the output power of the inverter; a PID controller; an RTC (Real Time Clock) for outputting the current time; a temperature sensor for measuring the external temperature; and a freeze-prevention judgment unit for setting the freeze-prevention mode using the external temperature of the temperature sensor and determining the operation time of the booster pump using the RTC, thereby preventing the pump from freezing and being damaged in winter or when the ambient temperature drops.

[0005] The above-mentioned inverter booster pump for freezing prevention is designed to start a pump that is not running at a predetermined rotational speed when the outside temperature drops below a set temperature, but has a disadvantage in that it cannot prevent cold air from outside from flowing into the inside of the pump.

[0006]

[0007] Accordingly, the purpose of the present invention is to provide a vertical multi-stage centrifugal pump using a double-structured can, in which the can is formed as a double structure in which a space is arranged between the inner can and the outer can, so as to prevent the can from being crushed or broken when the pump is started in the winter, and the low temperature outside is transferred to the fluid filled inside the pump, thereby preventing the fluid inside the pump from freezing.

[0008]

[0009] An example of a vertical multi-stage centrifugal pump using a double-structured can for freezing prevention according to the present invention to achieve the above purpose is as follows:

[0010] In a vertical multi-stage centrifugal pump, a cylindrical can and a multi-stage stacked stage are respectively mounted on a lower casing having an inlet and an outlet formed therein, the multi-stage stacked stages are arranged inside the can, a flow path is formed between the multi-stage stacked stages and the can, an upper casing is mounted on the top of the can, an impeller and a diffuser are arranged inside each stage, a drive shaft and a rotation shaft of a motor are connected by a coupling, an impeller is coupled to the rotation shaft, and the impeller rotates within the stage by the rotation shaft,

[0011] The above can is characterized by being formed as a double structure in which the can is composed of an inner can and an outer can, the outer can being placed on the outside of the inner can, and a space being placed between the inner can and the outer can.

[0012] The above lower casing is characterized in that the mounting portion is divided into a first mounting portion and a second mounting portion by first and second protrusions corresponding to the double structure of the can, and the lower end of the inner can is placed in the first mounting portion and the lower end of the outer can is placed in the second mounting portion.

[0013] In addition, the can is characterized in that a rubber seal is placed between the lower part of the inner can and the lower part of the outer can so that the space between the inner can and the outer can is sealed, so that the lower part of the inner can and the lower part of the outer can are sealed by the rubber seal.

[0014] The inner can is formed of stainless steel and is characterized in that the inner surface that comes into contact with the fluid is polished so that it can reflect radiant heat.

[0015] Alternatively, the inner can is formed of stainless steel and characterized in that the inner surface that comes into contact with the fluid is chrome-plated so that it can reflect radiant heat.

[0016] The above space is characterized by being vacuum or filled with air.

[0017] Alternatively, the space is characterized by being filled with insulation.

[0018]

[0019] By this, the vertical multi-stage centrifugal pump using a double-structured can for freezing prevention according to the present invention can prevent the can from being crushed or broken when the pump is started in winter, and has the effect of preventing the fluid inside the pump from freezing by transmitting the external low temperature to the fluid filled inside the pump.

[0020]

[0021] Fig. 1 is a cross-sectional view illustrating a vertical multi-stage centrifugal pump using a double-structured can for freezing prevention according to the present invention.

[0022] FIG. 2 and FIG. 3 are enlarged views of (a) of FIG. 1 to explain the structure in which a double-structured can is mounted on a mounting portion of a lower casing. FIG. 2 shows a state before a double-structured can is mounted on a mounting portion of a lower casing, and FIG. 3 shows a state in which a double-structured can is mounted on a mounting portion of a lower casing.

[0023] FIG. 4 is an enlarged view of (a) of FIG. 1 to explain another structure in which a double-structured can is mounted on a mounting portion of a lower casing.

[0024]

[0025] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the drawings.

[0026] Referring to FIG. 1, a vertical multistage centrifugal pump using a double-structured can for freezing prevention according to the present invention is configured such that a cylindrical can (20) and a multi-stage stacked stage (30) are mounted on a lower casing (10) in which an inlet (11) and a discharge port (12) are formed, and the multi-stage stacked stage (30) is arranged inside the can (20), so that a flow path (40) is formed between the multi-stage stacked stage (30) and the can (20), and an upper casing (45) is mounted on the top of the can (20), and an impeller (310) and a diffuser (320) are arranged inside each stage (30), and a drive shaft (55) and a rotation shaft (60) of a motor (50) are connected by a coupling (65), and the impeller (310) is coupled to the rotation shaft (60), so that the impeller (310) is driven by the rotation shaft (60). It rotates within the stage (30).

[0027] Referring to FIGS. 2 and 3, in the vertical multistage centrifugal pump using a double-structured can for freezing prevention according to the present invention, the can (20) is composed of an inner can (21; inner can) and an outer can (22; outer can), and the outer can (22) is arranged on the outside of the inner can (21), and a space (23) is arranged between the inner can (21) and the outer can (22), forming a double structure.

[0028] In addition, the lower casing (10) corresponds to the double structure of the can (20) in that the mounting portion (15) is divided into a first mounting portion (113) and a second mounting portion (114) by first and second protrusions (111, 112), and the lower end of the inner can (21) is placed in the first mounting portion (113), and the lower end of the outer can (22) is placed in the second mounting portion (114).

[0029] The unexplained drawing symbol 71 is a first seal for watertightening between the first protrusion (111) and the inner can (21), and the unexplained drawing symbol 72 is a second seal for watertightening between the second protrusion (112) and the outer can (22).

[0030] Referring to FIG. 4, in addition, the can (20) is provided with a rubber seal (75) placed between the lower end of the inner can (21) and the lower end of the outer can (22) so that the space (23) between the inner can (21) and the outer can (22) is sealed, so that the lower end of the inner can (21) and the lower end of the outer can (22) are sealed by the rubber seal (75).

[0031] At this time, the lower casing (10) is formed with a catch (115) on the outside of the mounting portion (15) so that the lower portion of the inner can (21) and the lower portion of the outer can (22) are connected by the rubber seal (75) of the can (20), as shown in FIG. 4, and a mounting surface (116) is arranged on the inside of the catch (115), so that the lower portion of the inner can (21) and the lower portion of the outer can (22) connected by the rubber seal (75) are arranged on the mounting surface (116).

[0032] The inner can (21) above is formed of stainless steel, and the inner surface that comes into contact with the fluid is polished so that it can reflect radiant heat.

[0033] Alternatively, the inner can (21) is formed of stainless steel and has an inner surface chrome-plated so that the inner surface in contact with the fluid can reflect radiant heat.

[0034] The above outer can (22) may be made of stainless steel of the same material as the inner can (21), but may also be formed of another material that blocks external heat and has higher strength than the inner can (21).

[0035] The above space (23) can be vacuum or filled with air.

[0036] Alternatively, the space (23) may be filled with insulation.

[0037] The above insulation is commercially available, so a detailed description will be omitted here. Furthermore, the insulation may be polyurethane foam.

[0038] The vertical multistage centrifugal pump using a double-structured can for freezing prevention according to the present invention, which is configured as described above, is formed with a double structure in which the can (20) is composed of an inner can (21) and an outer can (22), and a space (23) is arranged between the inner can (21) and the outer can (22), so that when the pump is started in winter, the can (20) can be prevented from being crushed or broken, and the low temperature outside can be transferred to the fluid filled inside the pump, so that the fluid inside the pump can be prevented from freezing.

[0039] In particular, the inner surface of the inner can (21) that comes into contact with the fluid can be polished or chrome plated to reflect radiant heat, thereby preventing the heat inside the pump from being transferred to the outside, thereby preserving the heat inside the pump, and the space (23) of the can (20) can be filled with a vacuum or air, or filled with an insulating material, thereby blocking the heat from outside from being transferred to the inside.

[0040]

[0041] As described above, the present invention has been described with specific details such as specific components and limited examples and drawings, but these are provided only to help a more general understanding of the present invention, and the present invention is not limited to the above examples, and those with ordinary knowledge in the field to which the present invention pertains can make various modifications and variations from this description.

[0042] Therefore, the idea of ​​the present invention should not be limited to the described embodiments, and all things that are equivalent or equivalent to the following claims as well as the claims are considered to fall within the scope of the idea of ​​the present invention.

Claims

1. In a vertical multi-stage centrifugal pump, a cylindrical can (20) and a multi-stage stacked stage (30) are mounted on a lower casing (10) in which an inlet (11) and an outlet (12) are formed, and the multi-stage stacked stage (30) is arranged inside the can (20), so that a flow path (40) is formed between the multi-stage stacked stage (30) and the can (20), and an upper casing (45) is mounted on the top of the can (20), and an impeller (310) and a diffuser (320) are arranged inside each stage (30), and a drive shaft (55) and a rotation shaft (60) of a motor (50) are connected by a coupling (65), and the impeller (310) is coupled to the rotation shaft (60), so that the impeller (310) rotates within the stage (30) by the rotation shaft (60). A vertical multi-stage centrifugal pump characterized in that the above can (20) is composed of an inner can (21) and an outer can (22), the outer can (22) is placed on the outside of the inner can (21), and a space (23) is placed between the inner can (21) and the outer can (22) and is formed as a double structure.

2. In paragraph 1, A vertical multi-stage centrifugal pump characterized in that the lower casing (10) corresponds to the double structure of the can (20) in that the mounting portion (15) is divided into a first mounting portion (113) and a second mounting portion (114) by first and second protrusions (111, 112), and the lower end of the inner can (21) is placed in the first mounting portion (113), and the lower end of the outer can (22) is placed in the second mounting portion (114).

3. In paragraph 1, The above can (20) is a vertical multi-stage centrifugal pump characterized in that a rubber seal (75) is arranged between the lower end of the inner can (21) and the lower end of the outer can (22) so that the space (23) between the inner can (21) and the outer can (22) is sealed, so that the lower end of the inner can (21) and the lower end of the outer can (22) are sealed by the rubber seal (75).

4. In paragraph 1, A vertical multi-stage centrifugal pump characterized in that the inner can (21) is formed of stainless steel and the inner surface that comes into contact with the fluid is polished so that it can reflect radiant heat.

5. In paragraph 1, A vertical multi-stage centrifugal pump characterized in that the inner can (21) is formed of stainless steel and the inner surface that comes into contact with the fluid is chrome-plated so that it can reflect radiant heat.

6. In paragraph 1, A vertical multi-stage centrifugal pump characterized in that the above space (23) is vacuum or filled with air.

7. In paragraph 1, A vertical multi-stage centrifugal pump characterized in that the above space (23) is filled with insulating material.

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