High-temperature molten salt pump shaft sealing device

Abstract

The utility model relates to a high-temperature molten salt pump shaft sealing device which comprises an external protective shell, the external protective shell is installed between a motor and a pump body, a first pump shaft and a second pump shaft are arranged in the external protective shell, an output shaft of the motor is connected with the first pump shaft, and the bottom of the second pump shaft penetrates into the pump body and is provided with an impeller. A conical block is installed on the outer surface of the second pump shaft, a fixing ring is installed on the inner wall of the outer protection shell, a conical base is installed on the upper surface of the fixing ring, and a first groove is formed in the inner wall of the conical base. Downward thrust is applied to the second pump shaft through the compression spring, the conical block is driven to be tightly pressed on the first sealing gasket, and therefore the sealing effect can be improved, when the lava pump is started, the first pump shaft rotates, the balance weight ball is driven to extend outwards through the centrifugal force effect, and therefore the swing arm applies downward thrust to the connecting arm, and the sealing effect is improved. And downward thrust is further applied to the second pump shaft, so that the conical block is further attached to the first sealing gasket, and the sealing effect is enhanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to high temperature molten salt pump technical field, concretely is a kind of high temperature molten salt pump shaft sealing device. BACKGROUND

[0002] High temperature molten salt pump is specially used to transport high temperature molten salt, its structural form includes molten salt liquid down pump, molten salt axial flow pump and RXB type molten salt circulating pump etc., it is suitable for transporting temperature in 450~800 ℃, specific gravity in 1.8~2.0 range high temperature molten salt, widely used in solar power generation, ion membrane caustic soda, aluminium oxide, organic chemical industry, melamine, nuclear power etc.

[0003] Molten salt pump usually structure is long shaft pump, generally will generate greater axial force, and in the running process, medium usually will appear shaft climbing situation, there is the risk of leakage, thus needs to be set sealing device on the outside of pump shaft, but the sealing effect of pump shaft sealing device in prior art is poor, it is difficult to guarantee the long time stable operation of high temperature molten salt pump. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a kind of high temperature molten salt pump shaft sealing device, effectively solve the problem raised in above background.

[0005] To achieve the above object, the utility model provides the following technical scheme.

[0006] A kind of high temperature molten salt pump shaft sealing device, including external protective shell, external protective shell is installed between motor and pump body, the inside of external protective shell is provided with first pump shaft and second pump shaft, the output shaft of motor is connected with first pump shaft, the bottom of second pump shaft is penetrated to the inside of pump body and is equipped with impeller. The outer surface of second pump shaft is installed with conical block, the inner wall of external protective shell is installed with fixed ring, the upper surface of fixed ring is installed with conical seat, the inner wall of conical seat is equipped with first recess, the inside of first recess is provided with first sealing pad, first sealing pad and the outer surface of second pump shaft are in conformance. Elastic mechanism is arranged between first pump shaft and second pump shaft, and the elastic mechanism is used to exert downward thrust to second pump shaft.

[0007] Further, the elastic mechanism includes installation slot in the inside of first pump shaft, the inside of installation slot is provided with sliding block, the lower surface of sliding block is connected with guide rod, and the end of guide rod is penetrated to the outside of first pump shaft and is connected with the top of second pump shaft, the inside of installation slot is provided with compression spring, and the two ends of compression spring are connected with the top wall of installation slot and the upper surface of sliding block respectively.

[0008] Further, the outer surface of the first pump shaft is provided with a first fixing sleeve, the outer surface of the first fixing sleeve is hingedly provided with a swing arm, the end of the swing arm is provided with a counterweight ball, the outer surface of the second pump shaft is provided with a second fixing sleeve, the outer surface of the second fixing sleeve is hingedly provided with a connecting arm, and the end of the connecting arm is hingedly connected with the swing arm.

[0009] Further, the inner wall of the fixing ring is provided with a second groove, and the second groove is internally provided with a second sealing pad, which is attached to the outer surface of the second pump shaft.

[0010] Further, the inner wall of the mounting groove is annularly provided with four key grooves, and the outer surface of the sliding block is annularly provided with four key blocks, which are arranged in the key grooves.

[0011] Further, the number of the swing arms is four, and the four swing arms are annularly distributed on the outer surface of the first fixing sleeve.

[0012] Further, the material of the counterweight ball is tungsten.

[0013] Compared with the prior art, the present application has the following advantages.

[0014] 1. The compression spring exerts a downward thrust on the second pump shaft, driving the conical block to press tightly on the first sealing pad, thereby improving the sealing effect, and when the lava pump is started, the first pump shaft rotates, driving the counterweight ball to extend outward under the action of centrifugal force, thereby enabling the swing arm to exert a downward thrust on the connecting arm and further exert a downward thrust on the second pump shaft, so that the conical block is further attached to the first sealing pad, and the sealing effect is enhanced.

[0015] 2. The second sealing pad is arranged to cooperate with the first sealing pad to achieve double sealing effect on the second pump shaft, thereby avoiding the risk of medium climbing the shaft and causing leakage, and ensuring long-term stable operation of the molten salt pump. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a three-dimensional schematic view of the overall structure of the present application;

[0017] Figure 2 It is a front view of the present application;

[0018] Figure 3 It is Figure 2 It is an enlarged schematic view of the structure at A in the present application;

[0019] Figure 4 It is a sectional view of the first pump shaft in the present application.

[0020] In the figure: 100, the outer protective shell; 101, the first pump shaft; 102, the second pump shaft; 103, the tapered block; 104, the fixed ring; 105, the tapered seat; 106, the first groove; 107, the first sealing pad; 200, the elastic mechanism; 201, the mounting groove; 202, the sliding block; 203, the guide rod; 204, the compression spring; 300, the first fixed sleeve; 301, the swing arm; 302, the counterweight ball; 303, the second fixed sleeve; 304, the connecting arm; 400, the second groove; 401, the second sealing pad; 500, the key groove; 501, the key block. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0022] In the description of the embodiments of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection", "installation" should be understood in a broad sense, for example, "connection" can be detachable connection, or can be non-detachable connection; can be direct connection, or can be indirect connection through an intermediate medium. In addition, "communication" can be direct communication, or can be indirect communication through an intermediate medium. Among them, "fixing" means connecting with each other and the relative positional relationship after connection does not change. The orientation terms mentioned in the embodiments of the present application, such as "inner", "outer", "top", "bottom", etc., are only the direction of the drawings, therefore, the orientation terms used are for better, clearer illustration and understanding of the embodiments of the present application, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the embodiments of the present application.

[0023] In the embodiments of the present application, the terms "first", "second" are only for description purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more of the features.

[0024] Please refer to Figures 1-4The utility model provides a high temperature molten salt pump shaft sealing device, including outside protective shell 100, outside protective shell 100 is installed between motor and pump body, the inside of outside protective shell 100 is provided with first pump shaft 101 and second pump shaft 102, and the output shaft of motor is connected with first pump shaft 101, and the bottom of second pump shaft 102 is penetrated to the inside of pump body and is installed with impeller. The outer surface of second pump shaft 102 is installed with conical block 103, and the inner wall of outside protective shell 100 is installed with fixed ring 104, and the upper surface of fixed ring 104 is installed with conical seat 105, and the inner wall of conical seat 105 is set with first recess 106, and the inside of first recess 106 is provided with first sealing pad 107, and first sealing pad 107 is attached with the outer surface of second pump shaft 102. Elastic mechanism 200 is arranged between first pump shaft 101 and second pump shaft 102, and elastic mechanism 200 is used to exert the downward thrust to second pump shaft 102.

[0025] When using, the downward thrust is exerted to second pump shaft 102 through elastic mechanism 200, and then conical block 103 is pressed on first sealing pad 107, and because the contact surface of conical block 103 and first sealing pad 107 is all inclined surface structure, the contact between the two is more closely, and the sealing effect is better, so the sealing effect can be realized.

[0026] Preferably, elastic mechanism 200 includes installation groove 201 set in the inside of first pump shaft 101, the inside of installation groove 201 is provided with sliding block 202, the lower surface of sliding block 202 is connected with guide rod 203, and the end of guide rod 203 is penetrated to the outside of first pump shaft 101 and is connected with the top of second pump shaft 102, the inside of installation groove 201 is provided with compression spring 204, and the two ends of compression spring 204 are connected with the top wall of installation groove 201 and the upper surface of sliding block 202 respectively.

[0027] Through the elastic force of compression spring 204, the downward thrust is exerted to sliding block 202, and the downward thrust is exerted to second pump shaft 102 through guide rod 203, so that conical block 103 and first sealing pad 107 are closely attached, and the sealing effect is improved.

[0028] Preferably, the outer surface of first pump shaft 101 is installed with first fixed sleeve 300, the outer surface of first fixed sleeve 300 is hinged and installed with swing arm 301, the end of swing arm 301 is installed with counterweight ball 302, the outer surface of second pump shaft 102 is installed with second fixed sleeve 303, the outer surface of second fixed sleeve 303 is hinged and connected with connecting arm 304, and the end of connecting arm 304 is hinged and connected with swing arm 301.

[0029] When the lava pump is in use, the motor drives the first pump shaft 101 to rotate, and the first pump shaft 101 drives the second pump shaft 102 to rotate through the elastic mechanism 200. Due to the high-speed rotation of the first pump shaft 101, a centrifugal force is generated, so that the counterweight ball 302 extends outward, and the angle of the swing arm 301 is inclined downward. At this time, the counterweight ball 302 generates a downward thrust, and the downward thrust is applied to the second pump shaft 102 through the connecting arm 304, so that the conical block 103 and the first sealing gasket 107 are further tightly attached, and the sealing effect is enhanced.

[0030] Preferably, the inner wall of the fixed ring 104 is provided with a second groove 400, and the second groove 400 is provided with a second sealing gasket 401 inside. The second sealing gasket 401 is attached to the outer surface of the second pump shaft 102.

[0031] Through the setting of the second sealing gasket 401, the first sealing gasket 107 can be used to double-seal the second pump shaft 102, so as to avoid the risk of leakage caused by medium climbing the shaft, and ensure the long-term stable operation of the molten salt pump.

[0032] Preferably, the inner wall of the mounting groove 201 is provided with four key grooves 500, and the outer surface of the sliding block 202 is provided with four key blocks 501 in a ring array, and the key blocks 501 are arranged in the key grooves 500.

[0033] Through the setting of the key grooves 500 and the key blocks 501, the sliding block 202 can rotate synchronously with the first pump shaft 101, and drive the second pump shaft 102 to rotate synchronously, so as to achieve the purpose of transmission.

[0034] Preferably, the number of swing arms 301 is four, and the four swing arms 301 are arranged in a ring array on the outer surface of the first fixed sleeve 300.

[0035] So that the first pump shaft 101 can apply uniform downward thrust to the second pump shaft 102 when rotating, improve the stability of the second pump shaft 102 when rotating, and increase the thrust effect on the second pump shaft 102.

[0036] Preferably, the material of the counterweight ball 302 is tungsten.

[0037] Tungsten has a large density and a large weight under the same volume, so that sufficient downward thrust can be generated on the second pump shaft 102 in the limited space inside the outer protective shell 100, and the sealing effect is guaranteed.

[0038] It is apparent for a person skilled in the art that the present application is not restricted to the details of the above exemplary embodiments, but that it can be implemented in other concrete forms without departing from the spirit or the essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary only, and not limiting, the scope of the present application being defined by the appended claims rather than the above description, and all changes coming within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims concerned.

Claims

1. A high-temperature molten salt pump shaft sealing device, comprising an external protective shell (100), characterized in that: the external protective shell (100) is installed between a motor and a pump body, a first pump shaft (101) and a second pump shaft (102) are arranged in the internal of the external protective shell (100), an output shaft of the motor is connected with the first pump shaft (101), and the bottom of the second pump shaft (102) penetrates into the pump body and is provided with an impeller; a conical block (103) is arranged on the outer surface of the second pump shaft (102), a fixed ring (104) is arranged on the inner wall of the external protective shell (100), a conical seat (105) is arranged on the upper surface of the fixed ring (104), a first groove (106) is formed in the inner wall of the conical seat (105), a first sealing gasket (107) is arranged in the first groove (106), and the first sealing gasket (107) is attached to the outer surface of the second pump shaft (102); a resilient mechanism (200) is arranged between the first pump shaft (101) and the second pump shaft (102), and the resilient mechanism (200) is used for applying a downward thrust to the second pump shaft (102).

2. The high-temperature molten salt pump shaft sealing device according to claim 1, characterized in that: the resilient mechanism (200) comprises a mounting groove (201) formed in the internal of the first pump shaft (101), a sliding block (202) is arranged in the mounting groove (201), a guide rod (203) is connected to the lower surface of the sliding block (202), the end of the guide rod (203) penetrates to the outside of the first pump shaft (101) and is connected with the top of the second pump shaft (102), a compression spring (204) is arranged in the mounting groove (201), and the two ends of the compression spring (204) are respectively connected with the top wall of the mounting groove (201) and the upper surface of the sliding block (202).

3. The high-temperature molten salt pump shaft sealing device according to claim 1, characterized in that: a first fixed sleeve (300) is arranged on the outer surface of the first pump shaft (101), a swing arm (301) is hingedly arranged on the outer surface of the first fixed sleeve (300), a counterweight ball (302) is arranged on the end of the swing arm (301), a second fixed sleeve (303) is arranged on the outer surface of the second pump shaft (102), a connecting arm (304) is hingedly connected to the outer surface of the second fixed sleeve (303), and the end of the connecting arm (304) is hingedly connected with the swing arm (301).

4. The high-temperature molten salt pump shaft sealing device according to claim 1, characterized in that: a second groove (400) is formed in the inner wall of the fixed ring (104), a second sealing gasket (401) is arranged in the second groove (400), and the second sealing gasket (401) is attached to the outer surface of the second pump shaft (102).

5. The high-temperature molten salt pump shaft sealing device according to claim 2, characterized in that: ​ The inner wall annular array of the mounting groove (201) is provided with four key grooves (500), and the outer surface annular array of the slider (202) is provided with four key blocks (501), and the key blocks (501) are arranged in the key grooves (500).

6. The high-temperature molten salt pump shaft sealing device according to claim 3, characterized in that: The number of the swing arms (301) is four, and the four swing arms (301) are distributed in an annular array on the outer surface of the first fixed sleeve (300).

7. The high-temperature molten salt pump shaft sealing device according to claim 3, characterized in that: The material of the counterweight ball (302) is tungsten.

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