Integrated molten salt pump

Abstract

The utility model relates to the field of pumps, in particular to an integrated molten salt pump, a medium inlet cavity, an impeller cavity and a pump cavity are sequentially arranged in a pump body in the axial direction, a pump shaft penetrates through the pump cavity and then is coaxially fixed with an impeller in the impeller cavity, and a sliding bearing in sliding fit with the pump shaft is installed in the impeller cavity. The pump body is further provided with a flow dividing channel avoiding the position of the impeller cavity, the medium inlet cavity communicates with the pump cavity through the flow dividing channel, and a medium gap allowing a medium to pass through exists between the sliding bearing and the pump shaft, so that a part of the medium sequentially passes through the flow dividing channel, the pump cavity and the medium gap from the medium inlet cavity to enter the impeller cavity and then is discharged. The dry grinding phenomenon between the sliding bearing and the pump shaft of the molten salt pump is avoided, and the service life of the sliding bearing is greatly prolonged.

Description

Technical Field

[0001] The utility model relates to the field of pumps, in particular to an integrated molten salt pump. Background Art

[0002] Molten salt pump is a pump used to transport high-temperature metal salts. It is used to transport high-temperature nitrates, nitrites, ion membrane caustic soda, etc. It is also widely used in chemical processes such as melamine, salt production, alkali production and urea. The temperature of the transported medium is usually between 400℃ and 500℃. The existing molten salt pump is as described in the application number "CN202311391527.7", and the motor is connected to a rotating shaft below, and an impeller is connected to the rotating shaft below. A shell is installed outside the rotating shaft, and also includes a spiral compensation device between the rotating shaft and the shell, and the spiral compensation device is located above the impeller. The spiral compensation device divides the inner space of the shell into two parts, the upper part is a molten salt chamber, and the lower part is an impeller chamber. The spiral compensation device includes a spiral sleeve and a spiral bushing. The outer wall of the spiral sleeve and the inner wall of the spiral bushing are both provided with spiral grooves. The spiral sleeve is fixedly connected to the rotating shaft, and the spiral bushing is fixed to the shell. The outer wall of the spiral bushing and the inner wall of the spiral sleeve are abutted against each other, and a spiral channel for molten salt to pass through is formed between the spiral bushing and the spiral sleeve, which can solve the technical problem that the pressure of the molten salt pump system is unstable, resulting in deformation of the falling film tube or empty tube, causing damage to the molten salt pump and system equipment.

[0003] However, the pump chamber and the medium inlet chamber of the existing molten salt pump are not connected to each other, the pressure in the pump chamber is balanced with the pressure in the medium inlet chamber, the pump shaft of the molten salt pump bears radial load through a sliding bearing, and lubrication is achieved by filling grease between the pump shaft and the sliding bearing; however, when conveying the medium, high temperatures of over 100 degrees can easily cause the grease between the sliding bearing and the pump shaft to volatilize, causing dry grinding between the sliding bearing and the pump shaft, thereby greatly reducing the service life of the sliding bearing, and therefore needs to be solved urgently. Utility Model Content

[0004] In order to avoid and overcome the technical problems existing in the prior art, the utility model provides an integrated molten salt pump. The utility model avoids dry grinding between the sliding bearing and the pump shaft of the molten salt pump, and greatly improves the service life of the sliding bearing.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] An integrated molten salt pump comprises a medium inlet chamber, an impeller chamber and a pump chamber which are sequentially arranged along the axial direction in a pump body. After the pump shaft passes through the pump chamber, it is coaxially fixed with the impeller in the impeller chamber. A sliding bearing which slides with the pump shaft is installed in the impeller chamber. A bypass channel which avoids the position of the impeller chamber is also provided on the pump body. The medium inlet chamber is connected with the pump chamber through the bypass channel, and a medium gap for the medium to pass through is provided between the sliding bearing and the pump shaft, so that a part of the medium enters the impeller chamber from the medium inlet chamber through the bypass channel, the pump chamber and the medium gap in sequence and is then discharged.

[0007] As a further solution of the utility model: a mounting seat for positioning the impeller is arranged in the impeller cavity, a support cylinder is arranged axially in the pump cavity, the pump cover and the mounting seat are connected and fixed by the support cylinder, and a guide hole is opened on the cylinder wall of the support cylinder for the flow of the medium.

[0008] As a further solution of the utility model: the lower layer of the pump chamber is used to accommodate the medium, the upper layer of the pump chamber is used to accommodate the inactive gas, and the support tube is provided with at least two groups of guide holes at different heights to allow the medium and the inactive gas to flow respectively.

[0009] As a further solution of the utility model: a positioning step is provided at one end of the impeller cavity wall away from the medium inlet cavity, and a positioning protrusion is radially protruded on the mounting seat for abutting and cooperating with the positioning step, and the supporting tube presses and fixes the mounting seat on the positioning step; a sealing ring is provided at the contact surface between the positioning step and the positioning protrusion.

[0010] As a further solution of the utility model: an impeller chamber inlet coaxially arranged with the pump shaft is arranged at one end of the impeller chamber adjacent to the medium inlet chamber, the mounting seat is coaxially fixed with the guide vane, and the guide vane is pressed and fixed at the impeller chamber inlet, a sealing ring is provided at the contact surface between the guide vane and the impeller chamber inlet, the guide vane and the mounting seat enclose an installation space for installing the impeller, and the medium in the impeller chamber is discharged from the pump body outlet after passing through the guide vane.

[0011] As a further solution of the utility model: an insulating cavity for isolating heat and a water cooling cavity for water cooling are arranged in sequence along the inner edge of the pump cover away from the medium inlet cavity, and a water cooling liquid inlet and a water cooling liquid outlet connected to the water cooling cavity are radially opened on the pump cover to allow the water cooling liquid to flow continuously.

[0012] As a further solution of the utility model: a gas seal is installed at one end of the pump shaft outside the pump chamber, and the gas seal abuts against the pump cover to prevent gas leakage in the pump chamber.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. The utility model provides a bypass channel in the pump body to increase a flow path for the medium. After a part of the medium enters the pump chamber along the bypass channel, it enters the impeller chamber through the medium gap between the sliding bearing and the pump shaft. The sliding bearing is lubricated by the medium, thereby avoiding dry grinding between the sliding bearing and the pump shaft and greatly improving the service life of the sliding bearing. At the same time, the continuous flow of the medium also avoids the formation of a dead zone in the pump chamber and prevents the medium from solidifying in the pump chamber.

[0015] 2. The utility model presses and fixes the mounting base in the impeller cavity through the support tube, so as to fix the guide vane and the impeller; by pre-filling the pump cavity with inactive gas, the medium transported in the pump cavity is prevented from being oxidized; the support tube is provided with a guide hole, so that the medium in the pump cavity and the inactive gas can flow freely after passing through the tube cavity of the support tube.

[0016] 3. The utility model sets a heat insulation cavity and a water cooling cavity on the pump cover to prevent the high temperature of the medium from being transmitted to the sealing cavity and bearing outside the pump body, thereby improving the service life of the equipment. Carbon ring seals are selected for gas sealing, which reduces the cost of mechanical sealing and improves the stability of equipment operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model.

[0018] In the figure:

[0019] 1. Pump body; 11. Medium inlet chamber; 12. Impeller chamber; 13. Pump chamber; 14. Diversion channel;

[0020] 15. Support tube; 151. Diversion hole; 16. Heat insulation cavity; 17. Water cooling cavity;

[0021] 2. Pump shaft; 121. Mounting seat; 122. Sliding bearing; 123. Impeller; 124. Guide vane;

[0022] 3. Gas sealing. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1In an embodiment of the utility model, an integrated molten salt pump is provided, in which a medium inlet chamber 11, an impeller chamber 12 and a pump chamber 13 are sequentially arranged along the axial direction in a pump body 1. The pump body 1 is integrally formed so that the pump body 1 is divided into three chambers, and the medium enters the impeller chamber 12 through the medium inlet chamber 11.

[0025] The pump cover of the pump body 1 is arranged away from the medium inlet chamber 11, and one end of the pump shaft 2 passes through the pump cover and the pump chamber 13 in the axial direction of the pump body 1 and then extends into the impeller chamber 12, and is coaxially fixed with the impeller 123. The cavity of the impeller chamber 12 is cylindrical, and a ring-shaped positioning step is provided on the top of the cavity wall of the impeller chamber 12. The mounting seat 121 is radially provided with a positioning protrusion matching the shape of the positioning step. The mounting seat 121 is inserted into the impeller chamber 12 from top to bottom, and at this time, the positioning protrusion is abutted and matched with the positioning step.

[0026] In order to improve the sealing effect, a sealing gasket is provided at the contact surface of the positioning protrusion and the positioning step. The mounting seat 121 is annular, and the sliding bearing 122 is inserted into the axial cavity of the mounting seat 121 along the axial direction, and is preferably fixed to the mounting seat 121 by bolts. After the mounting seat 121 is pressed on the positioning step, there is still a certain distance between the bottom end of the mounting seat 121 and the bottom surface of the impeller chamber 12 for installing the guide vane 124. The guide vane 124 is preferably fixed to the bottom of the mounting seat 121 by bolts. The bottom of the impeller chamber 12 is provided with an impeller chamber inlet along the axial direction, so that the medium can enter the impeller chamber 12 from bottom to top along the inlet of the guide vane 124. After the guide vane 124 is installed, it is pressed and fixed at the inlet of the impeller chamber, and a sealing ring is installed at the contact surface between the guide vane 124 and the inlet of the impeller chamber. After the guide vane 124 is installed, it is enclosed with the mounting seat 121 to form an installation space for installing the impeller 123, and the medium enters the impeller chamber 12 and is discharged from the pump body outlet after passing through the guide vane 124.

[0027] The pump body 1 is also provided with a flow diversion channel 14 which is offset from the impeller chamber 12 and is arranged parallel to the axis of the pump body 1. The flow diversion channel 14 connects the medium inlet chamber 11 with the pump chamber 13, thereby diverting a portion of the medium into the pump chamber 13. After the medium enters the pump chamber 13, the liquid level in the pump chamber 13 is higher than the sliding bearing 122, and the sliding bearing 122 is immersed in the medium.

[0028] After the pump shaft 2 passes through the sliding bearing 122 , a medium gap exists between the shaft body and the sliding bearing 122 for the medium to pass through. The medium in the pump chamber 13 passes through the medium gap from above the sliding bearing 122 and enters the impeller chamber 12 , thereby lubricating the sliding bearing 122 .

[0029] A support tube 15 is arranged in the pump chamber 13. The top of the support tube 15 is fixed to the pump cover by bolts, and the bottom of the support tube 15 is fixed to the mounting seat 121 by bolts. The mounting seat 121 is pressed into the impeller chamber 12 by the support tube 15. An injection hole is provided on the pump cover for pre-injecting inactive gas into the pump chamber 13. The inactive gas can be nitrogen or an inert gas. The upper chamber of the pump chamber 13 is used to accommodate inactive gas, and the lower chamber of the pump chamber 13 is used to accommodate medium. The wall of the support tube 15 is provided with guide holes 151 at different heights for the passage of inactive gas and medium.

[0030] The end of the pump shaft 2 extends outside the pump body 1 and is connected to the power end. A heat-insulating cavity 16 is arranged at the bottom of the pump cover to prevent high temperature from being transmitted to the power cavity and the bearing position outside the pump body 1. A water-cooling cavity 17 is arranged inside the pump cover. The pump cover is radially provided with a water-cooling liquid inlet and a water-cooling liquid outlet connected to the water-cooling cavity 17. The temperature is lowered by the continuous flow of the water-cooling liquid to prevent high temperature from being transmitted to the sealing cavity. A gas seal 3 is also installed at one end of the pump shaft 2 outside the pump cavity 13. The gas seal 3 is fixed to the pump cover by bolts to prevent gas leakage in the pump cavity 13. The gas seal 3 is preferably a carbon ring seal.

[0031] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0032] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

Claims

1. An integrated molten salt pump, characterized in that: A medium inlet chamber (11), an impeller chamber (12) and a pump chamber (13) are sequentially arranged in the axial direction in the pump body (1). The pump shaft (2) passes through the pump chamber (13) and is coaxially fixed with the impeller (123) in the impeller chamber (12). A sliding bearing (122) that is slidably matched with the pump shaft (2) is installed in the impeller chamber (12). The pump body (1) is also provided with a flow diversion channel (14) that avoids the position of the impeller chamber (12). The medium inlet chamber (11) and the pump chamber (13) are connected through the flow diversion channel (14), and a medium gap for the medium to pass through exists between the sliding bearing (122) and the pump shaft (2), so that a part of the medium enters the impeller chamber (12) from the medium inlet chamber (11) through the flow diversion channel (14), the pump chamber (13) and the medium gap in sequence and is then discharged.

2. An integrated molten salt pump according to claim 1, characterized in that: A mounting seat (121) for positioning an impeller (123) is arranged in the impeller chamber (12); a support cylinder (15) is arranged axially in the pump chamber (13); a pump cover and the mounting seat (121) are connected and fixed via the support cylinder (15); a guide hole (151) is provided on the cylinder wall of the support cylinder (15) for medium flow.

3. An integrated molten salt pump according to claim 2, characterized in that: The lower layer of the pump chamber (13) is used to contain a medium, and the upper layer of the pump chamber (13) is used to contain an inactive gas. The support tube (15) is provided with at least two groups of flow guide holes (151) at different heights to allow the medium and the inactive gas to flow respectively.

4. An integrated molten salt pump according to claim 2 or 3, characterized in that: A positioning step is provided at one end of the cavity wall of the impeller cavity (12) away from the medium inlet cavity (11); a positioning protrusion is radially protruded on the mounting seat (121) for abutting against the positioning step; the supporting cylinder (15) presses and fixes the mounting seat (121) on the positioning step; and a sealing ring is provided at the contact surface between the positioning step and the positioning protrusion.

5. The integrated molten salt pump according to claim 4, characterized in that: An impeller chamber inlet coaxially arranged with the pump shaft (2) is arranged at one end of the impeller chamber (12) adjacent to the medium inlet chamber (11); the mounting seat (121) is coaxially fixed with the guide vane (124), and the guide vane (124) is pressed and fixed at the impeller chamber inlet; a sealing ring is arranged at the contact surface between the guide vane (124) and the impeller chamber inlet; the guide vane (124) and the mounting seat (121) are enclosed to form an installation space for installing an impeller (123); the medium in the impeller chamber (12) passes through the guide vane (124) and is discharged from the pump body outlet.

6. An integrated molten salt pump according to any one of claims 1 to 3, characterized in that: A heat insulating cavity (16) for isolating heat and a water cooling cavity (17) for water cooling are sequentially arranged in the pump cover in a direction away from the medium inlet cavity (11); a water cooling liquid inlet and a water cooling liquid outlet connected to the water cooling cavity (17) are radially opened on the pump cover to allow the water cooling liquid to flow continuously.

7. The integrated molten salt pump according to claim 6, characterized in that: A gas seal (3) is installed at one end of the pump shaft (2) located outside the pump chamber (13), and the gas seal (3) abuts against the pump cover to prevent gas leakage in the pump chamber (13).

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