Sealing ring liquid sealing structure of centrifugal pump

Abstract

The utility model belongs to the field of centrifugal pumps, and provides a sealing ring liquid sealing structure of a centrifugal pump, which comprises a pump body, an impeller and a pump body sealing ring. Wherein the pump body forms a liquid injection channel; the impeller is movably installed in the pump body and can rotate around the central axis of the impeller, and a flow channel for fluid to pass through is formed in the impeller. The pump body sealing ring is connected to the pump body in a sealed mode, an annular groove coaxial with the impeller is formed in the side, away from the pump body, of the pump body sealing ring, a liquid inlet enabling the annular groove to be communicated with the liquid injection channel is further formed in the pump body sealing ring, and the part, used for forming the liquid inlet port of the flow channel, of the impeller extends into the annular groove and can be always kept in the annular groove in the rotating process of the impeller.

Description

Technical Field

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

[0002] In the quench oil circulation system of the ethylene unit, the quench oil is a key medium. The coke particle impurities contained in it pose a severe challenge to the operating efficiency and reliability of the pump, especially when the maximum diameter of the coke particles reaches 5 mm, which aggravates the wear and leakage risks of the pump body sealing parts. In the traditional design, a combination of the pump body sealing ring and the pump cover sealing ring is adopted, and a sealing ring flushing structure is provided to deal with the sealing failure problem caused by coke particles. However, this solution has exposed significant defects in practice, namely, the consumption of flushing liquid (which also plays a sealing role) is huge, which not only increases the operating cost, but also limits the overall efficiency improvement of the centrifugal pump. 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 sealing ring liquid sealing structure of a centrifugal pump to solve the technical problem of large consumption of sealing liquid in the prior art.

[0004] To achieve the above purpose, the technical solution adopted in this application is: to provide a sealing ring liquid sealing structure of a centrifugal pump, comprising:

[0005] A pump body, forming a liquid injection channel;

[0006] An impeller is movably mounted inside the pump body and is capable of rotating around its own central axis, and a flow channel is formed on the impeller for fluid to pass through;

[0007] A pump body sealing ring is sealingly connected to the pump body and forms an annular groove coaxial with the impeller on a side away from the pump body. The pump body sealing ring is also formed with a liquid inlet that connects the annular groove to the injection channel. The part of the impeller used to form the liquid inlet port of the flow channel extends into the annular groove and can always remain inside the annular groove during the rotation of the impeller.

[0008] Optionally, an annular liquid homogenizing groove is formed on the pump body;

[0009] The liquid homogenizing tank is coaxially arranged with the pump body sealing ring and is communicated with the liquid injection channel and the liquid inlet respectively.

[0010] Optionally, a plurality of liquid inlets are formed on the pump body sealing ring, and the plurality of liquid inlets are evenly spaced and distributed axially around the annular groove.

[0011] Optionally, a flange portion perpendicular to the axial direction of the pump body sealing ring is formed on the pump body sealing ring;

[0012] A plurality of mounting holes for sealingly connecting the pump body sealing ring to the pump body are preset on the flange portion, and the plurality of mounting holes are evenly spaced around the axis of the pump body sealing ring.

[0013] Optionally, the seal ring liquid sealing structure further includes an impeller sealing ring coaxially and sealingly sleeved on the impeller;

[0014] The impeller sealing ring is close to the liquid inlet port of the flow channel and can always remain inside the ring groove during the rotation of the impeller.

[0015] The impeller sealing ring, the liquid inlet port of the flow channel and the ring groove form a U-shaped path for accommodating the sealing liquid.

[0016] Optionally, the seal ring liquid sealing structure further includes an end cover connected to the pump body, a pump shaft passing through the end cover and coaxially connected to the impeller, and a bushing and a shaft sleeve lining between the end cover and the pump shaft and sealingly connected;

[0017] The impeller forms a back vane on the side facing the end cover, and the back vane is preformed into a shape capable of driving the fluid away from the pump shaft during the rotation of the impeller.

[0018] Optionally, a plurality of the back vanes are provided and evenly spaced around the pump shaft.

[0019] The beneficial effect of the seal ring liquid sealing structure of the centrifugal pump provided by this application is that: compared with the prior art, in the seal ring liquid sealing structure of the centrifugal pump of this application, the liquid injection channel on the pump body and the liquid inlet communicating with the ring groove can be used to continuously provide a high-pressure liquid medium for the ring groove. Since the part of the impeller forming the liquid inlet port of the flow channel extends into the ring groove and can always remain inside the ring groove during the rotation of the impeller, a stable and continuous lubrication and sealing barrier can be formed between the impeller and the pump body sealing ring through the high-pressure liquid medium. In this way, whether it is during the process of the quench oil entering the internal flow channel of the impeller or after the quench oil is pressurized and thrown out by the impeller, the quench oil and the coke particle impurities in it can be effectively blocked from entering the sealing gap between the impeller and the pump body sealing ring. Therefore, the seal ring liquid sealing structure of the centrifugal pump in this application can, while ensuring the sealing performance, greatly reduce the consumption of the sealing liquid and improve the operation efficiency and reliability of the centrifugal pump, far superior to the prior art. Description of the Drawings

[0020] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 It is a schematic diagram of the overall structure of the liquid seal structure of the sealing ring of the centrifugal pump in the embodiment of the present application;

[0022] Figure 2 Is Figure 1 The enlarged view of the structure at A in;

[0023] Figure 3 It is the overall structure sectional view of the pump body sealing ring in this embodiment;

[0024] Figure 4 It is the front view of the overall structure of the pump body sealing ring in this embodiment;

[0025] Figure 5 It is the overall structure sectional view of the impeller in this embodiment;

[0026] Figure 6 It is the front view of the overall structure of the impeller in this embodiment.

[0027] Among them, the reference numerals in the figure: 101, pump body; 102, liquid injection channel; 103, impeller; 104, flow channel; 105, pump body sealing ring; 106, ring groove; 107, liquid inlet; 108, liquid homogenizing groove; 109, flange part; 110, mounting hole; 111, impeller sealing ring; 112, end cover; 113, pump shaft; 114, bushing; 115, shaft sleeve; 116, back vane. Specific embodiments

[0028] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the following further details the present application in conjunction with the 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.

[0029] 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.

[0030] It should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application.

[0031] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality of" means two or more unless otherwise specifically defined.

[0032] Please refer to Figures 1 to 6 together. Now, a liquid seal structure of a sealing ring of a centrifugal pump provided in an embodiment of the present application will be described. The liquid seal structure of the sealing ring of the centrifugal pump includes a pump body 101, an impeller 103, and a pump body sealing ring 105. Among them:

[0033] The pump body 101 forms a liquid injection channel 102; the impeller 103 is movably installed inside the pump body 101 and can rotate around its own central axis. A flow channel 104 for fluid to pass through is formed on the impeller 103; the pump body sealing ring 105 is sealingly connected to the pump body 101 and forms an annular groove 106 coaxial with the impeller 103 on the side facing away from the pump body 101. A liquid inlet 107 for connecting the annular groove 106 to the liquid injection channel 102 is further formed on the pump body sealing ring 105. The part of the impeller 103 forming the liquid inlet port of the flow channel 104 extends into the annular groove 106 and can always remain inside the annular groove 106 during the rotation of the impeller 103.

[0034] According to the above structure provided in this embodiment, in the liquid seal structure of the centrifugal pump's seal ring in this embodiment, the liquid injection channel 102 on the pump body 101 and the liquid inlet 107 communicating with the annular groove 106 can be used to continuously supply high-pressure liquid medium (i.e., sealing liquid) to the annular groove 106. Since the part of the impeller 103 that forms the liquid inlet port of the flow channel 104 extends into the annular groove 106 and can always remain inside the annular groove 106 during the rotation of the impeller 103, a stable and continuous lubrication and sealing barrier can be formed between the impeller 103 and the pump body seal ring 105 through the high-pressure liquid medium. In this way, whether it is during the process of the quench oil entering the internal flow channel 104 of the impeller 103 or after the quench oil is pressurized and ejected by the impeller 103, the quench oil and the coke particle impurities therein can be effectively blocked from entering the sealing gap between the impeller 103 and the pump body seal ring 105. Therefore, the liquid seal structure of the centrifugal pump's seal ring in this embodiment can, while ensuring the sealing performance, greatly reduce the consumption of the sealing liquid and improve the operating efficiency and reliability of the centrifugal pump, far superior to the prior art.

[0035] In another embodiment of the present application, please refer to Figures 1 to 6 , an annular liquid homogenizing groove 108 is formed on the pump body; the liquid homogenizing groove 108 is coaxially arranged with the pump body seal ring 105 and is respectively communicated with the liquid injection channel 102 and the liquid inlet 107. According to the above structure provided in this embodiment, the design of the liquid homogenizing groove 108 helps to pre-distribute the fluid before it enters the liquid inlet 107 and make it more uniform, which is beneficial to further improving the sealing effect of the liquid seal structure of the centrifugal pump's seal ring in this embodiment and further reducing the consumption of the sealing liquid.

[0036] In another embodiment of the present application, please refer to Figures 1 to 6 , a plurality of liquid inlets 107 are formed on the pump body seal ring 105, and the plurality of liquid inlets 107 are evenly spaced around the axis of the annular groove 106. According to the above structure provided in this embodiment, the plurality of liquid inlets 107 provided in the annular groove 106 can enable the fluid to enter the annular groove 106 evenly from all directions, which can effectively avoid the accumulation of high-pressure fluid in local positions in the annular groove 106, balance the pressure of each part, and is beneficial to further improving the sealing effect of the liquid seal structure of the centrifugal pump's seal ring in this embodiment and further reducing the consumption of the sealing liquid.

[0037] In another embodiment of the present application, please refer to Figures 1 to 6The pump body sealing ring 105 is provided with a flange portion 109 perpendicular to its own axial direction; the flange portion 109 is provided with a plurality of mounting holes 110 for sealingly connecting the pump body sealing ring 105 to the pump body 101, and the plurality of mounting holes 110 are evenly spaced around the axial direction of the pump body sealing ring 105. According to the above structure provided in this embodiment, during the installation process of the pump body sealing ring 105, bolts or other fasteners can be passed through the mounting holes 110 to tightly fix the pump body sealing ring 105 on the pump body 101, thereby forming a reliable sealing structure. In this way, by carefully designing the number and position of the mounting holes 110, the sealing effect of the sealing ring liquid sealing structure of the centrifugal pump in this embodiment can be further improved and the consumption of sealing liquid can be further reduced.

[0038] In another embodiment of the present application, please refer to Figures 1 to 6 The sealing ring liquid sealing structure also includes an impeller sealing ring 111 coaxially sealed on the impeller 103; the impeller sealing ring 111 is close to the liquid inlet port of the flow channel 104 and can always remain inside the annular groove 106 during the rotation of the impeller 103; the impeller sealing ring 111, the liquid inlet port of the flow channel 104 and the annular groove 106 form a U-shaped path for accommodating the sealing liquid. In this way, when the impeller sealing ring 111 and the impeller 103 are used to form a U-shaped path for accommodating the sealing liquid between the liquid inlet port of the flow channel 104 and the annular groove 106, the U-shaped path is bent relative to the bottom surface of the annular groove 106, especially from the surface of the liquid inlet 107 to the liquid inlet port of the flow channel 104, not only is the path bent, but also the path length is increased, thereby forming a better throttling effect, and significantly reducing the outflow of the sealing liquid during operation; at the same time, the U-shaped path is connected to the high-pressure side of the impeller 103 at the outlet end of the impeller 103 in the section, and under the high pressure of the centrifugal pumping medium, the amount of sealing liquid flowing out of the path is also reduced. According to the above structure provided in this embodiment, the impeller sealing ring 111 mounted on the impeller 103 can cooperate with the pump body sealing ring 105 and form a more stable and reliable sealing barrier through the high-pressure sealing liquid medium between the two, which is conducive to further improving the sealing effect of the sealing ring liquid sealing structure of the centrifugal pump in this embodiment and further reducing the consumption of sealing liquid.

[0039] In another embodiment of the present application, please refer to Figures 1 to 6 The sealing ring liquid sealing structure also includes an end cover 112 connected to the pump body 101, a pump shaft 113 that passes through the end cover 112 and is coaxially connected to the impeller 103, and a bushing 114 and a shaft sleeve 115 that are arranged between the end cover 112 and the pump shaft 113 and are sealed; the impeller 103 forms a back blade 116 on the side facing the end cover 112, and the back blade 116 is preformed into a shape that can drive the fluid away from the pump shaft 113 during the rotation of the impeller 103.

[0040] According to the above structure provided in this embodiment, the back vane 116 provided on the impeller 103 can drive the fluid away from the pump shaft 113 and form a low-pressure area near the pump shaft 113, so that the quenching oil after being pressurized and thrown out from the impeller 103, that is, the pumping medium, can be significantly reduced from forming a large impact on the sealing structure formed between the bushing 114 and the shaft sleeve 115, which is beneficial to reducing the entry of impurities into the mating surface between the bushing 114 and the shaft sleeve 115 and ensuring the reliable operation of the centrifugal pump. In addition, the low-pressure area at the inlet of the flow channel 104 and the low-pressure area formed near the pump shaft 113 during the rotation of the back vane 116 act in opposite directions on the axial force of the impeller 103, so that the unidirectional axial force exerted by the impeller 103 on the pump shaft 113 can be greatly reduced, playing a role in balancing the axial force on the pump shaft 113, which is beneficial to the liquid seal structure of the sealing ring of the centrifugal pump in this embodiment to operate stably for a longer time.

[0041] In another embodiment of the present application, please refer to Figures 1 to 6 , a plurality of back vanes 116 are provided and are evenly spaced around the pump shaft 113. According to the above structure provided in this embodiment, through the collaborative work of the plurality of back vanes 116, the fluid can be more effectively driven away from the pump shaft 113 during the rotation of the impeller 103 and a more obvious low-pressure area can be formed. This enhanced fluid driving effect helps to further reduce the impact of the quenching oil on the sealing structure between the bushing 114 and the shaft sleeve 115, thereby being beneficial to further improving the sealing effect of the liquid seal structure of the sealing ring of the centrifugal pump in this embodiment.

[0042] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A sealing ring liquid sealing structure of a centrifugal pump, characterized in that: include: A pump body (101) forming a liquid injection channel (102); An impeller (103) is movably mounted inside the pump body (101) and is capable of rotating around its own central axis, and a flow channel (104) for fluid to pass through is formed on the impeller (103); A pump body sealing ring (105) is sealingly connected to the pump body (101) and forms an annular groove (106) coaxial with the impeller (103) on a side facing away from the pump body (101). The pump body sealing ring (105) is also formed with a liquid inlet (107) that connects the annular groove (106) to the injection channel (102). The portion of the impeller (103) used to form the liquid inlet port of the flow channel (104) extends into the annular groove (106) and can always remain inside the annular groove (106) during the rotation of the impeller (103).

2. The sealing ring liquid sealing structure of a centrifugal pump according to claim 1, characterized in that: An annular liquid homogenizing groove (108) is formed on the pump body; The liquid homogenizing groove (108) is coaxially arranged with the pump body sealing ring (105) and is respectively connected to the liquid injection channel (102) and the liquid inlet (107).

3. The sealing ring liquid sealing structure of a centrifugal pump according to claim 2, characterized in that: A plurality of liquid inlets (107) are formed on the pump body sealing ring (105), and the plurality of liquid inlets (107) are evenly spaced and distributed axially around the annular groove (106).

4. The sealing ring liquid sealing structure of a centrifugal pump according to claim 3, characterized in that: The pump body sealing ring (105) has a flange portion (109) formed on it which is perpendicular to its axial direction. The flange portion (109) is pre-set with a plurality of mounting holes (110) for sealingly connecting the pump body sealing ring (105) to the pump body (101), and the plurality of mounting holes (110) are evenly spaced around the axial direction of the pump body sealing ring (105).

5. The sealing ring liquid sealing structure of a centrifugal pump according to claim 1, characterized in that: The sealing ring liquid sealing structure further comprises an impeller sealing ring (111) coaxially sealingly sleeved on the impeller (103); The impeller sealing ring (111) is close to the liquid inlet port of the flow channel (104) and can always remain inside the annular groove (106) during the rotation of the impeller (103); The impeller sealing ring (111), the liquid inlet port of the flow channel (104), and the annular groove (106) form a U-shaped path for accommodating sealing liquid.

6. The sealing ring liquid sealing structure of a centrifugal pump according to claim 1, characterized in that: The sealing ring liquid sealing structure further comprises an end cover (112) connected to the pump body (101), a pump shaft (113) penetrating the end cover (112) and coaxially connected to the impeller (103), and a bushing (114) and a shaft sleeve (115) arranged between the end cover (112) and the pump shaft (113) and sealedly connected. The impeller (103) is formed with a back blade (116) on a side facing the end cover (112), and the back blade (116) is preformed into a shape capable of driving the fluid away from the pump shaft (113) during the rotation of the impeller (103).

7. The sealing ring liquid sealing structure of a centrifugal pump according to claim 6, characterized in that: A plurality of back blades (116) are provided and are evenly spaced and distributed around the pump shaft (113).

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