A new type of seal device for a slurry pump

Abstract

The utility model discloses a novel slurry pump sealing device relates to mechanical seal technical field, including rotating part and stationary part: rotating part is by medium side dynamic ring, shaft sleeve and pump shaft, and medium side dynamic ring is through the pin peg and is equipped with in the outer of shaft sleeve, and shaft sleeve is pressed in the impeller end face through the hug ring, stationary part contains medium side static ring, medium side push ring and atmospheric side gland, and medium side static ring is connected with push ring through the pin peg, and push ring is axially connected with atmospheric side gland through transmission pin, and atmospheric side gland is fixed in the pump cover. The spring is arranged between atmospheric side gland and medium side push ring, and medium side dynamic ring and static ring are pushed and abut tightly and seal. Medium side dynamic ring diameter D1 is less than medium side push ring diameter D4, and greater than medium side static ring diameter D3, forms positive balance - reverse unbalanced structure, and increases the closed force, and atmospheric side seal is established between stationary part and shaft sleeve, and contains atmospheric side dynamic ring seal that rotates with shaft sleeve, atmospheric side static ring seal that is fixed in atmospheric side gland, compact structure, saves the space.

Description

Technical Field

[0001] This utility model relates to the field of mechanical seal technology, specifically to a novel slurry pump sealing device. Background Technology

[0002] Slurry pumps are used in power plant desulfurization industries and chemical industries for highly corrosive and abrasive media.

[0003] Site conditions: The medium contains particles, is prone to crystallization, or is highly corrosive; the site water pressure is low and cannot meet the conditions of PLAN54 (i.e., the water pressure is lower than the pump chamber pressure); and the site equipment starts and stops frequently.

[0004] The conventional double-end seals currently in use are prone to the following problems during operation:

[0005] The medium contains particles, is prone to crystallization, or is highly corrosive, causing parts in contact with the medium to be abraded and corroded by the medium;

[0006] Due to the low water pressure at the site, the liquid film on the medium side end face is the medium itself, which causes the end face to stick easily during equipment shutdown. At the moment of startup, due to insufficient closing force, the sealing end face is opened, resulting in unstable seal life. Utility Model Content

[0007] To address the aforementioned technical problems, this application solves the issues of poor resistance to abrasion and corrosion and unstable seal life in the prior art. This makes the components of the slurry pump sealing device in contact with the medium more resistant to abrasion and corrosion; increases the closing force of the medium-side seal, reducing the risk of the sealing end face opening; and increases the stability of the seal, resulting in a more compact sealing structure.

[0008] To achieve the above objectives, the technical solution adopted in this application is: a novel slurry pump sealing device, comprising a rotating component and a stationary component;

[0009] The rotating component includes a medium-side moving ring, a bushing, and a pump shaft. The medium-side moving ring is sleeved outside the bushing by a pin or a fork. The bushing is sleeved outside the pump shaft, and the bushing is axially pressed against the right end face of the impeller of the slurry pump by a clamping ring.

[0010] The stationary component includes a medium-side stationary ring, a medium-side push ring, and an atmospheric-side pressure cover. The medium-side stationary ring is connected to the medium-side push ring by a pin or a fork. The medium-side push ring is axially connected to the atmospheric-side pressure cover by a drive pin. The atmospheric-side pressure cover is connected to the pump cover of the slurry pump by bolts or screws.

[0011] A spring is provided between the atmospheric side pressure cap and the medium side push ring. The spring pushes the medium side push ring to press against the medium side moving ring in the axial direction, thereby making the medium side moving ring and the medium side stationary ring in a pressed state.

[0012] To better realize this utility model, the diameter D1 of the medium-side moving ring is smaller than the diameter D4 of the medium-side push ring, and the diameter D1 of the medium-side moving ring is larger than the balance diameter D3 of the medium-side stationary ring.

[0013] To better realize this utility model, an atmospheric side seal is further provided between the stationary component and the bushing;

[0014] The atmospheric side seal includes an atmospheric side dynamic ring seal and an atmospheric side static ring seal;

[0015] The atmospheric side dynamic ring seal is located between the medium side stationary ring and the medium side push ring, which together form a whole, and the bushing, and the atmospheric side dynamic ring seal can rotate synchronously with the bushing; the atmospheric side stationary ring seal is located between the atmospheric side pressure cap and the bushing, and the atmospheric side stationary ring seal and the atmospheric side pressure cap are fixedly connected to each other.

[0016] To better realize this utility model, a first sealing ring is further provided between the medium-side pressure cap and the medium-side stationary ring, a second sealing ring is provided between the medium-side stationary ring and the medium-side push ring, and a third sealing ring is provided between the medium-side push ring and the atmospheric pressure cap.

[0017] The inner edge of the medium-side gland is fitted over the outside of the integral formed by the medium-side stationary ring and the medium-side push ring, and the outer edge of the medium-side gland is pressed between the atmospheric gland and the pump cover. The medium-side gland and the atmospheric gland are sealed together by a gland sealing gasket.

[0018] To better realize this utility model, the medium-side moving ring pressure ring is further sleeved on the outer part of the shaft sleeve located on the left side of the medium-side moving ring. The right end face of the medium-side moving ring pressure ring is in contact with the left end face of the medium-side moving ring. The left end face of the medium-side moving ring pressure ring is flush with the left end face of the shaft sleeve. The left end face of the integral formed by the medium-side moving ring pressure ring and the shaft sleeve is in contact with the right end face of the impeller.

[0019] To better realize this utility model, a medium-side moving ring sealing ring is further provided between the right end face of the medium-side moving ring pressure ring and the left end face of the medium-side moving ring; the left end face of the medium-side moving ring pressure ring is flush with the left end face of the bushing, and the left end face of the integral formed by the medium-side moving ring pressure ring and the bushing and the right end face of the impeller form a common contact surface, and a bushing sealing gasket is provided at the common contact surface.

[0020] To better realize this utility model, the atmospheric side pressure cover is further provided with an exhaust hole.

[0021] To better realize this utility model, the parts of the slurry pump sealing device that come into contact with the medium inside the slurry pump are made of silicon carbide.

[0022] In addition, radially arranged flushing holes are provided on the outer peripheral wall of the atmospheric side pressure cover.

[0023] The technical solution provided by this utility model has the following advantages compared with the prior art:

[0024] 1. In this utility model, the parts of the slurry pump sealing device that come into contact with the medium inside the slurry pump are all made of silicon carbide. Silicon carbide has extremely high hardness and good chemical stability, which can effectively resist the abrasion of particles in the medium and the erosion of strong corrosive media, greatly extending the service life of the parts in contact with the medium and reducing the maintenance frequency and replacement cost of the equipment due to wear and corrosion.

[0025] 2. In this invention, a specially designed media-side push ring achieves both forward-balanced and reverse-unbalanced sealing of the media-side surface, increasing the closing force of the media-side friction pair end face. During equipment use, even after pump shutdown and restart, the risk of the sealing end face opening due to impurities is significantly reduced, ensuring the stability of the seal under complex operating conditions and making the equipment operation more reliable.

[0026] 3. In this utility model, the structure of the stationary ring seat on the medium side is modified, reducing the steps of the stationary ring and significantly reducing the risk of jamming when sealing in media containing impurities or prone to crystallization. This ensures that the sealing element can move flexibly axially under various operating conditions, maintaining good sealing performance.

[0027] 4. In this utility model, an atmospheric side seal is fitted between the stationary component and the bushing, saving the space required for the seal and making the entire sealing device structure more compact. This compact structure not only facilitates the miniaturization of the equipment but also makes installation and maintenance easier. Furthermore, the rotation and agitation of the equipment allows for more uniform heat distribution of the internal sealing fluid, making it easier to remove and exchange the frictional heat generated at the sealing end face and the conductive heat of the medium, further improving the reliability of the seal.

[0028] 5. In this utility model, the seal can be used simultaneously in both the PLAN54 and PLAN55 auxiliary systems, and multiple sealing rings are individually provided, making the function of each sealing ring clear and singular. When used in conjunction with the auxiliary systems, it reduces the water pressure requirements of the seal flushing system at the equipment site, expands the application range of the equipment, and improves the stability of the equipment under different water pressure conditions. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0031] Explanation of reference numerals in the attached figures:

[0032] 101 Medium-side gland 102 spring 103 Medium-side moving ring pressure ring 104 Medium-side moving ring 105 Medium-side stationary ring 106 First sealing ring 107 Second sealing ring 108 Third sealing ring 109 Medium-side thrust ring 110 Atmospheric side pressure cover 111 pump shaft 112 bushing 1131 Atmospheric side dynamic ring seal 1132 Atmospheric side static ring seal 114 Hug the ring 115 Pump cover 116 Exhaust port 117 impeller Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0035] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0036] In the description of this application, it should be noted that the use of terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" to indicate orientation or positional relationships is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships commonly used when the product is in use. These terms are used solely for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the use of terms such as "first" and "second" in the description of this application is only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0037] Furthermore, the use of terms such as "horizontal" and "vertical" in the description of this application does not imply that the component is required to be absolutely horizontal or suspended, but rather that it may be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but rather that it may be slightly tilted.

[0038] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0039] In the traditional structure, the bidirectional balance structure achieves the bidirectional balance function of the medium-side seal by changing the structure of the medium-side stationary ring, so that the balance diameter of the medium-side stationary ring D3 is located between the diameter of the medium-side moving ring D1 and the inner diameter of the medium-side stationary ring (narrow ring) D2.

[0040] Example 1

[0041] like Figure 1 As shown, this utility model discloses a novel sealing device for a slurry pump, as detailed below:

[0042] 1. Modify the medium-side push ring 109. With the D3 dimension of the medium-side stationary ring 105 unchanged, make the D4 of the medium-side push ring 109 > the D1 of the medium-side moving ring 104, and D1 > D3. This achieves the function of positive balance and reverse unbalance of the medium-side seal, and increases the closing force of the medium-side friction pair end face, reducing the risk of the sealing end face opening due to impurities when restarting after the pump stops during use.

[0043] 2. By using the medium-side push ring 109, the step of the medium-side stationary ring 105 is reduced, thereby reducing the risk of seal jamming in media containing impurities or prone to crystallization.

[0044] 3. An atmospheric seal is provided between the stationary component and the bushing 112; the atmospheric seal includes an atmospheric moving ring seal 1131 and an atmospheric stationary ring seal 1132; the atmospheric moving ring seal 1131 is located between the medium-side stationary ring 105 and the medium-side push ring 109 and the bushing 112, and the atmospheric moving ring seal 1131 can rotate synchronously with the bushing 112 (that is, the atmospheric moving ring seal 1131 can be fitted outside the bushing 112 by means of a pin or a fork, etc.); the atmospheric stationary ring seal 1132 is located between the atmospheric pressure cap 110 and the bushing 112, and the atmospheric stationary ring seal 1132 and the atmospheric pressure cap 110 are fixedly connected to each other (by means of a pin or a fork, etc.). This saves on the space required for sealing, resulting in a compact structure. At the same time, the rotation and agitation of the equipment makes the heat of the sealing liquid inside more uniform, making it easier to carry away and exchange the heat generated at the sealing end face, such as frictional heat and conductive heat from the medium.

[0045] 4. The first sealing ring 106, the second sealing ring 107, and the third sealing ring 108 are set separately, making the function of each sealing ring clear and singular. When used with the PLAN54 or PLAN55 auxiliary system, the water pressure requirements of the sealing flushing system on site are reduced, thus making the use more stable.

[0046] 5. The medium-side moving ring 103, medium-side moving ring 104, medium-side stationary ring 105, and medium-side pressure plate 101 are made of silicon carbide (SiC) or duplex stainless steel (such as 2205, 2507), or other materials, which can meet the working conditions of various corrosive media, particulate media, and easily crystallizing media.

[0047] Function Description:

[0048] 1. The medium-side moving ring 104 is sleeved on the outside of the 112 bushing by means of a pin or a fork. The bushing 112 is pressed against the right end face of the impeller 117 by the clamping ring 114. The medium-side moving ring 104, the bushing 112, and the pump shaft 111 together constitute a rotating component.

[0049] 2. The medium-side stationary ring 105 is connected to the medium-side push ring 109 by means of pins or forks. The medium-side push ring 109 is connected to the atmospheric-side pressure cover 110 by a transmission pin. The atmospheric-side pressure cover 110 is connected to the pump cover 115 by bolts or screws. The medium-side stationary ring 105, the medium-side push ring 109, and the atmospheric-side pressure cover 110 together constitute a stationary component.

[0050] 3. The medium-side moving ring 104 and the medium-side stationary ring 105 are connected by a spring 102. The atmospheric pressure cover 110 has a groove on its end face near the medium-side push ring 109. The spring 102 is set in the groove. One end of the spring 102 is fixedly connected to the inner bottom surface of the groove, and the other end of the spring 102 is fixedly connected to the end face of the medium-side push ring 109 facing the 110. The auxiliary sealing ring structures, such as the first sealing ring 106, the second sealing ring 107, and the third sealing ring 108, achieve fitting, automatic compensation, and sealing.

[0051] The inner edge of the medium-side pressure cap 101 is fitted onto the outside (outer ring) of the integral structure formed by the medium-side stationary ring 105 and the medium-side push ring 109.

[0052] Furthermore, the outer edge of the medium-side gland 101 is pressed between the atmospheric-side gland 110 and the pump cover 115.

[0053] Furthermore, the medium-side gland 101 and the atmospheric-side gland 110 are sealed together by a gland sealing gasket (i.e., a gland sealing gasket is provided between the medium-side gland 101 and the atmospheric-side gland 110).

[0054] A first sealing ring 106 is provided between the medium-side gland 101 and the medium-side stationary ring 105, a second sealing ring 107 is provided between the medium-side stationary ring 105 and the medium-side push ring 109, and a third sealing ring 108 is provided between the medium-side push ring 109 and the atmospheric gland 110.

[0055] The medium-side moving ring pressure ring 103 is sleeved on the outer part of the bushing of the 112 bushing located on the left side of the 104 medium-side moving ring;

[0056] The right end face of the medium-side moving ring pressure ring 103 is in contact with the left end face of the medium-side moving ring 104, and a medium-side moving ring sealing ring is provided between the right end face of the medium-side moving ring pressure ring 103 and the left end face of the medium-side moving ring 104.

[0057] The left end face of the medium-side moving ring pressure ring 103 is flush with the left end face of the bushing 112. The left end face of the integral formed by the medium-side moving ring pressure ring 103 and the bushing 112 and the right end face of the impeller 117 form a common contact surface, and a bushing sealing gasket is provided at the common contact surface.

[0058] A positioning block is provided on the right end face of the atmospheric side pressure cover 110 by a positioning block screw. A groove is provided on the outer peripheral wall of the bushing 112 located on the right side of the atmospheric side static ring seal 1132. The inner ring edge of the positioning block is engaged in the groove.

[0059] The atmospheric side pressure cover 110 is provided with an exhaust hole 116. One end of the exhaust hole 116 is connected to the atmospheric side, and the other end is connected to the gap formed between the medium side pressure cover 101 and the medium side push ring 109.

[0060] This utility model discloses a novel slurry pump sealing device that can be used in the following equipment:

[0061] 1. Flue gas desulfurization pumps for the power generation industry;

[0062] 2. Pumps used in the new energy industry, such as those used in battery iron phosphate plants for conveying materials in stages such as aging, slurry, re-slurry, washing, and thickening.

[0063] 3. Pumps used in the extraction, filtration, washing, concentration, and purification processes of the phosphate chemical industry;

[0064] 4. Pumps used in the acid preparation, premixing, acidolysis, filtration, and concentration stages of the sulfuric acid process titanium dioxide industry.

[0065] 5. Pumps used in extraction, filtration, and other processes in the chemical and metallurgical industries;

[0066] 6. Slag discharge, alkali solution, and acid solution pumping in the chlorination section of the titanium dioxide industry using the chlorination process.

[0067] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A novel sealing device for a slurry pump, characterized in that: Includes rotating parts and stationary parts; The rotating component includes a medium-side moving ring pressure ring (103), a medium-side moving ring (104), a bushing (112), and a pump shaft (111). The medium-side moving ring (104) is sleeved on the outside of the bushing (112) by a pin or a fork. The bushing (112) is sleeved on the outside of the pump shaft (111), and the bushing (112) is axially pressed against the right end face of the impeller (117) of the slurry pump by a clamping ring (114). The stationary components include a medium-side pressure cap (101), a medium-side stationary ring (105), a medium-side push ring (109), and an atmospheric-side pressure cap (110). The medium-side stationary ring (105) is connected to the medium-side push ring (109) by a pin or a fork. The medium-side push ring (109) is axially connected to the atmospheric-side pressure cap (110) by a drive pin. The atmospheric-side pressure cap (110) is connected to the pump cover (115) of the slurry pump by bolts or screws. A spring (102) is provided between the atmospheric side pressure cap (110) and the medium side push ring (109). The spring (102) pushes the medium side push ring (109) to press against the medium side moving ring (104) in the axial direction, thereby making the medium side moving ring (104) and the medium side stationary ring (105) in a pressed state.

2. The novel slurry pump sealing device according to claim 1, characterized in that: The diameter D1 of the moving ring (104) on the medium side is smaller than the diameter D4 of the push ring (109) on the medium side, and the diameter D1 of the moving ring (104) on the medium side is larger than the diameter D3 of the stationary ring (105) on the medium side.

3. A novel slurry pump sealing device according to claim 2, characterized in that: An atmospheric seal is provided between the stationary component and the bushing (112); The atmospheric side seal includes an atmospheric side dynamic ring seal (1131) and an atmospheric side static ring seal (1132). The atmospheric side dynamic ring seal (1131) is located between the medium side stationary ring (105) and the medium side push ring (109) and the bushing (112), and the atmospheric side dynamic ring seal (1131) can rotate synchronously with the bushing (112); the atmospheric side stationary ring seal (1132) is located between the atmospheric side pressure cap (110) and the bushing (112), and the atmospheric side stationary ring seal (1132) and the atmospheric side pressure cap (110) are fixedly connected to each other.

4. A novel slurry pump sealing device according to claim 3, characterized in that: A first sealing ring (106) is provided between the medium-side pressure cap (101) and the medium-side stationary ring (105), a second sealing ring (107) is provided between the medium-side stationary ring (105) and the medium-side push ring (109), and a third sealing ring (108) is provided between the medium-side push ring (109) and the atmospheric pressure cap (110). The inner edge of the medium-side pressure cap (101) is sleeved on the outside of the whole formed by the medium-side stationary ring (105) and the medium-side push ring (109), and the outer edge of the medium-side pressure cap (101) is pressed between the atmospheric pressure cap (110) and the pump cover (115). The medium-side pressure cap (101) and the atmospheric pressure cap (110) are sealed together by the pressure cap sealing gasket.

5. A novel slurry pump sealing device according to claim 4, characterized in that: The medium-side moving ring pressure ring (103) is sleeved on the outer part of the bushing (112) located on the left side of the medium-side moving ring (104). The right end face of the medium-side moving ring pressure ring (103) is in contact with the left end face of the medium-side moving ring (104). The left end face of the medium-side moving ring pressure ring (103) is flush with the left end face of the bushing (112). The left end face of the whole formed by the medium-side moving ring pressure ring (103) and the bushing (112) is in contact with the right end face of the impeller (117).

6. A novel slurry pump sealing device according to claim 5, characterized in that: A medium-side moving ring sealing ring is provided between the right end face of the medium-side moving ring pressure ring (103) and the left end face of the medium-side moving ring (104); The left end face of the medium-side moving ring pressure ring (103) is flush with the left end face of the bushing (112). The left end face of the integral formed by the medium-side moving ring pressure ring (103) and the bushing (112) forms a common contact surface with the right end face of the impeller (117), and a bushing sealing gasket is provided at the common contact surface.

7. A novel slurry pump sealing device according to claim 6, characterized in that: An exhaust port (116) is provided on the atmospheric side pressure cover (110).

8. A novel slurry pump sealing device according to claim 7, characterized in that: The sealing device of the slurry pump, in the part that comes into contact with the medium inside the slurry pump, is made of silicon carbide.

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