A floating sealing ring structure for a rotary jet pump

Abstract

The present application belongs to the field of rotary jet pumps, and provides a floating sealing ring structure for a rotary jet pump, including a liquid collecting pipe, a first sealing ring, an impeller, and a second sealing ring. The first sealing ring is coaxially connected to the liquid collecting pipe; the impeller is rotatably mounted on the liquid collecting pipe and can be driven to rotate by the liquid collecting pipe; the impeller and the first sealing ring are spaced apart and overlap in the axial direction of the liquid collecting pipe; a front drainage boss extending radially toward the impeller along the liquid collecting pipe is formed on the first sealing ring; a rear drainage boss extending radially toward the first sealing ring along the liquid collecting pipe is formed on the impeller; the front drainage boss and the rear drainage boss are spaced apart relative to each other along the axial direction of the liquid collecting pipe and cooperate with the overlapping part of the impeller and the first sealing ring to form a receiving cavity; the second sealing ring is arranged inside the receiving cavity, and gaps for the second sealing ring to move are formed between the second sealing ring and the first sealing ring and between the second sealing ring and the impeller.

Description

Technical Field

[0001] The present application belongs to the field of rotary jet pumps, and in particular to a floating sealing ring structure for a rotary jet pump. Background Art

[0002] Existing rotary jet pumps usually adjust the speed through a frequency converter to adapt to different working conditions. However, when the speed of the rotary jet pump reaches 5000 rpm, the leakage pressure at the sealing ring can rise to 10MPa. This high-speed, high-pressure working condition will cause a lot of friction between the collecting pipe and the impeller sealing ring and cause serious wear of the collecting pipe and the impeller in long-term operation, which not only affects the normal operation of the equipment, but also leads to high maintenance costs. Therefore, it is necessary to solve the above technical problems. Summary of the invention

[0003] The purpose of the embodiments of the present application is to provide a floating sealing ring structure for a rotary jet pump to solve the technical problem of short service life of the rotary jet pump in the prior art.

[0004] To achieve the above purpose, the technical solution adopted in this application is: to provide a floating sealing ring structure for a rotary jet pump, comprising:

[0005] Liquid collecting pipe;

[0006] A first sealing ring, coaxially connected to the liquid collecting pipe;

[0007] An impeller is rotatably mounted on the collecting pipe and can be driven to rotate by the main shaft, the impeller and the first sealing ring are spaced apart and overlap in the axial direction of the collecting pipe, a front drainage boss extending in the radial direction of the collecting pipe toward the impeller is formed on the first sealing ring, and a rear drainage boss extending in the radial direction of the collecting pipe toward the first sealing ring is formed on the impeller, the front drainage boss and the rear drainage boss are spaced apart from each other in the axial direction of the collecting pipe and cooperate with the overlapping portion of the impeller and the first sealing ring to form a receiving chamber;

[0008] The second sealing ring is arranged inside the accommodating cavity, and gaps for the second sealing ring to move are respectively formed between the second sealing ring and the first sealing ring and between the second sealing ring and the impeller.

[0009] Optionally, the first sealing ring forms a step on the surface used to form the accommodating cavity, and the rear drainage boss extends into the angle space formed by the step.

[0010] Optionally, a groove for accommodating the second sealing ring is formed on a surface of the rear guide boss facing the front guide boss.

[0011] Optionally, a conical slope facing the impeller is formed on the front guide boss, and the conical slope is connected to the surface of the front guide boss for forming the accommodating cavity, and the projection of the small port edge of the conical slope in the axial direction of the first sealing ring is located within the area defined by the end face contour of the second sealing ring.

[0012] Optionally, the first sealing ring is cold-mounted on the liquid collecting tube and forms an interference fit with the liquid collecting tube.

[0013] Optionally, the projected diameter of the edge of the conical sloped small port in the axial direction of the first sealing ring is 0.6-1.2 mm smaller than the outer diameter of the second sealing ring, and the conical slope is used to enable the pressure generated when the medium pumped by the rotary jet pump leaks along the gap between the second sealing ring and the first sealing ring to push the second sealing ring toward and press against the bottom surface of the groove.

[0014] Optionally, a gap notch is formed between the inner wall of the second sealing ring and the adjacent side wall of the groove, and the gap notch is used to generate a recoil force to increase the flow resistance of the high-pressure liquid medium flow when the medium pumped by the rotary jet pump leaks along the gap between the second sealing ring and the first sealing ring to form a high-pressure liquid medium flow.

[0015] The beneficial effect of the floating seal ring structure for the rotary jet pump provided by the present application is that: compared with the prior art, in the floating seal ring structure for the rotary jet pump provided by the present application, the second seal ring is arranged in a receiving cavity formed by the front drainage boss, the rear drainage boss and the overlapping part between the first seal ring and the impeller, and gaps for the second seal ring to move are respectively formed between the second seal ring and the first seal ring and between the second seal ring and the impeller. Since the smaller the gap, the greater the surface tension of the liquid medium, when the high-pressure liquid medium flows into the receiving cavity and flows along the axial direction of the collecting pipe, the second seal ring can continue to float in the receiving cavity under the driving action of the tension of the high-pressure liquid medium without contacting the first seal ring, so that the wear of the collecting pipe or the impeller can be effectively avoided and the service life of the rotary jet pump can be significantly extended, which is far superior to the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 This is a schematic diagram of the overall structure of the floating sealing ring structure for the rotary jet pump in the embodiment of the present application;

[0018] Figure 2 for Figure 1 A magnified view of the structure at center;

[0019] Figure 3 This is a schematic diagram of the main structure of the first sealing ring in the embodiment of the present application;

[0020] Figure 4 This is a schematic diagram of the main structure of the second sealing ring in the embodiment of the present application;

[0021] Figure 5 This is a schematic diagram of the installation status of the floating sealing ring structure for the rotary jet pump in the embodiment of the present application.

[0022] Among them, the reference numerals in the figure are: 100, liquid collecting pipe; 200, first sealing ring; 201, front guide boss; 202, step; 203, conical slope; 300, impeller; 301, rear guide boss; 302, groove; 303, gap notch; 400, accommodating chamber; 500, second sealing ring; 600, main shaft. DETAILED DESCRIPTION

[0023] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0024] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0025] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0027] Please also read Figures 1 to 5 Now, a floating seal ring structure for a rotary jet pump provided in an embodiment of the present application is described. The floating seal ring structure for a rotary jet pump comprises a liquid collecting pipe 100, a first seal ring 200, an impeller 300 and a second seal ring 500. Among them, the first sealing ring 200 is coaxially connected to the collecting pipe 100; the impeller 300 is rotatably installed on the collecting pipe 100 and can be driven to rotate by the main shaft 600, the impeller 300 and the first sealing ring 200 are arranged at intervals and overlap in the axial direction of the collecting pipe 100, a front diversion boss 201 extending radially toward the impeller 300 along the collecting pipe 100 is formed on the first sealing ring 200, and a rear diversion boss 301 extending radially toward the first sealing ring 200 along the collecting pipe 100 is formed on the impeller 300, the front diversion boss 201 and the rear diversion boss 301 are spaced opposite to each other along the axial direction of the collecting pipe 100 and cooperate with the overlapping part of the impeller 300 and the first sealing ring 200 to form a receiving cavity 400; the second sealing ring 500 is arranged inside the receiving cavity 400, and gaps for the second sealing ring 500 to move are formed between the second sealing ring 500 and the first sealing ring 200 and between the second sealing ring 500 and the impeller 300 respectively. In this embodiment, the impeller 300 can be driven to rotate by a motor that is transmission-connected to the main shaft 600, which is a prior art, so that the liquid medium to be pumped is sucked into the rotor cavity formed by the impeller 300, and finally collected and output by the collecting pipe 100. At this time, the liquid medium inside the rotor cavity is in a high-pressure state, and has a tendency to leak toward the low-pressure area along the fitting portion between the impeller 300 and the collecting pipe 100.

[0028] According to the above structure provided in the present embodiment, in the floating sealing ring structure for the rotary jet pump provided in the present embodiment, the second sealing ring 500 is arranged in an accommodating cavity 400 formed by the front guide boss 201, the rear guide boss 301 and the overlapping part between the first sealing ring 200 and the impeller 300, and gaps for the second sealing ring 500 to move are also formed between the second sealing ring 500 and the first sealing ring 200 and between the second sealing ring 500 and the impeller 300, respectively. Since the surface tension of the liquid medium increases as the gap becomes smaller, when the high-pressure liquid medium flows into the accommodating chamber 400 and flows along the axial direction of the collecting pipe 100, the second sealing ring 500 can continuously float in the accommodating chamber 400 under the driving action of the tension of the high-pressure liquid medium without contacting the first sealing ring 200. This can effectively avoid the wear of the collecting pipe 100 or the impeller 300 and significantly extend the service life of the rotary jet pump. At the same time, after reaching the set wear life, only the first sealing ring 200 and the second sealing ring 500 need to be replaced, and the maintenance cost is low, which is far superior to the existing technology.

[0029] In another embodiment of the present application, please refer to Figures 1 to 5The first sealing ring 200 forms a step 202 on the surface used to form the accommodating cavity 400, and the rear guide boss 301 extends into the angle space formed by the step 202. According to the above structure provided in this embodiment, the step 202 formed by the first sealing ring 200 and the rear guide boss 301 extending into the angle space of the step 202 can extend the flow path of the high-pressure liquid medium flowing through the accommodating cavity 400 and make it more tortuous (see Figure 2 The path shown by the arrow) can increase the difficulty of the liquid medium flowing out of the accommodating cavity 400, thereby stabilizing the liquid film in the flow path, avoiding direct contact and wear between the mating surfaces of the first sealing ring 200 and the second sealing ring 500, and making the leakage of the floating sealing ring structure for the rotary jet pump provided in this embodiment smaller, thereby further forming a better sealing effect.

[0030] In another embodiment of the present application, please refer to Figures 1 to 5 The rear flow guide boss 301 forms a groove 302 for accommodating the second sealing ring 500 on the surface facing the front flow guide boss 201. According to the above structure provided in this embodiment, the groove 302 formed on the rear flow guide boss 301 can make the second sealing ring 500 float more stably in the accommodating cavity 400, which is conducive to further extending the service life of the rotary jet pump.

[0031] In another embodiment of the present application, please refer to Figures 1 to 5 A conical inclined surface 203 is formed on the front flow guide boss 201, facing the impeller 300. The conical inclined surface 203 is connected to the surface of the front flow guide boss 201 for forming the accommodating cavity 400. The projection of the small end edge of the conical inclined surface 203 in the axial direction of the first sealing ring 200 is located within the area defined by the end face profile of the second sealing ring 500. According to the above structure provided in this embodiment, the conical inclined surface 203 formed on the front flow guide boss 201 can be used as a guide structure for the liquid medium outside the accommodating cavity 400 to make it easier for it to enter the accommodating cavity 400, so that the second sealing ring 500 can float more continuously and is conducive to further extending the service life of the rotary jet pump.

[0032] In another embodiment of the present application, please refer to Figures 1 to 5, the first sealing ring 200 is cold-installed on the collecting pipe 100 and forms an interference fit with the collecting pipe 100. According to the above structure provided in the present embodiment, by cold-installing the first sealing ring 200 on the collecting pipe 100, the first sealing ring 200 can be more stably installed on the collecting pipe 100, which can ensure that the second sealing ring 500 floats more stably and is beneficial to further extend the service life of the rotary jet pump. The cold installation method described in the present embodiment is to freeze the collecting pipe 100 and then install the first sealing ring 200 on the collecting pipe 100 and form an interference fit with the first sealing ring 200 after the temperature of the collecting pipe 100 recovers. It can be understood that other installation methods in the art for interference-installing the first sealing ring 200 on the collecting pipe 100 should also be regarded as a modified implementation of the cold installation method in the present embodiment and are within the protection scope of the present application, and will not be repeated here.

[0033] In another embodiment of the present application, please refer to Figures 1 to 5 The projected diameter of the small end edge of the conical slope 203 in the axial direction of the first sealing ring 200 is 0.6~1.2mm smaller than the outer diameter of the second sealing ring 500. The conical slope 203 is used to make the pressure generated when the medium pumped by the rotary jet pump leaks along the gap between the second sealing ring 500 and the first sealing ring 200 push the second sealing ring 500 toward and press against the bottom surface of the groove 302, so that the second sealing ring 500 maintains a stable axial position when the rotary jet pump is working. At the same time, when the second sealing ring 500 presses against the bottom surface of the groove 302, the leakage path formed between the second sealing ring 500 and the impeller 300 is cut off, so that the leakage amount is stabilized within the set range.

[0034] In another embodiment of the present application, please refer to Figures 1 to 5 A gap notch 303 is formed between the inner wall of the second sealing ring 500 and the adjacent side wall of the groove 302. The gap notch 303 is used to generate a recoil force to increase the flow resistance of the high-pressure liquid medium flow when the medium pumped by the rotary jet pump leaks along the gap between the second sealing ring 500 and the first sealing ring 200 to form a high-pressure liquid medium flow. It can be understood here that when the high-pressure liquid medium is ejected from the gap between the second sealing ring 500 and the first sealing ring 200, it first enters the gap notch 303. Due to the obstruction of the bottom surface of the groove 302, the high-pressure liquid medium recoils. Since the direction of the recoil force is opposite to the flow direction of the high-pressure liquid medium flow, the flow resistance of the high-pressure liquid medium flow is increased, thereby effectively reducing the leakage.

[0035] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A floating seal ring structure for a rotary jet pump, characterized in that: include: Liquid collecting pipe (100); A first sealing ring (200) coaxially connected to the liquid collecting pipe (100); an impeller (300) rotatably mounted on the liquid collecting pipe (100) and capable of being driven to rotate by a main shaft (600); the impeller (300) and the first sealing ring (200) are arranged at intervals and overlap in the axial direction of the liquid collecting pipe (100); a front drainage boss (201) extending radially toward the impeller (300) along the liquid collecting pipe (100) is formed on the first sealing ring (200); a rear drainage boss (301) extending radially toward the first sealing ring (200) along the liquid collecting pipe (100) is formed on the impeller (300); the front drainage boss (201) and the rear drainage boss (301) are spaced opposite to each other in the axial direction of the liquid collecting pipe (100) and cooperate with the overlapping portion of the impeller (300) and the first sealing ring (200) to form a receiving chamber (400); a second sealing ring (500) arranged inside the accommodating cavity (400), with gaps for the second sealing ring (500) to move being formed between the second sealing ring (500) and the first sealing ring (200) and between the second sealing ring (500) and the impeller (300); The first sealing ring (200) forms a step (202) on a surface used to form the accommodating cavity (400), and the rear drainage boss (301) extends into an angle space formed by the step (202); The rear flow guiding boss (301) has a groove (302) formed on a surface facing the front flow guiding boss (201) for accommodating the second sealing ring (500); A conical inclined surface (203) facing the impeller (300) is formed on the front flow guiding boss (201), and the conical inclined surface (203) is connected to a surface of the front flow guiding boss (201) for forming the accommodating cavity (400); the projection of the small end edge of the conical inclined surface (203) in the axial direction of the first sealing ring (200) is located within the area defined by the end face profile of the second sealing ring (500).

2. The floating seal ring structure for a rotary jet pump according to claim 1, characterized in that: The first sealing ring (200) is cold-mounted on the liquid collecting pipe (100) and forms an interference fit with the liquid collecting pipe (100).

3. The floating seal ring structure for a rotary jet pump according to claim 1, characterized in that: The projected diameter of the small end edge of the conical inclined surface (203) in the axial direction of the first sealing ring (200) is 0.6-1.2 mm smaller than the outer diameter of the second sealing ring (500), and the conical inclined surface (203) is used to enable the pressure generated when the medium pumped by the rotary jet pump leaks along the gap between the second sealing ring (500) and the first sealing ring (200) to push the second sealing ring (500) toward and press against the bottom surface of the groove (302).

4. The floating seal ring structure for a rotary jet pump according to claim 1, characterized in that: A gap notch (303) is formed between the inner wall of the second sealing ring (500) and the adjacent side wall of the groove (302). The gap notch (303) is used to generate a recoil force when the medium pumped by the rotary jet pump leaks along the gap between the second sealing ring (500) and the first sealing ring (200) to form a high-pressure liquid medium flow, thereby increasing the flow resistance of the high-pressure liquid medium flow.

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