Three-screw pump for delivering high temperature lubricating grease

Abstract

The utility model relates to three screw rod pump technical field, concretely relates to three screw rod pump for conveying high temperature lubricating grease, including double -deck heat preservation pump body, shaft seal, screw rod to be used for double -deck heat preservation pump body's double -deck welding type heat preservation mechanism, be used for shaft seal's mechanical seal flushing mechanism, be used for screw rod's axial thrust mechanism. The three screw rod pump for conveying high temperature lubricating grease, through having the double -deck welding type with heat preservation function's double -deck heat preservation pump body design, make it in the conveying high temperature lubricating grease pumping process, realize high pressure material in low pressure chamber when in overpressure is introduced, through having the shaft seal design with mechanical seal flushing system, reliably realized the shaft seal problem of high temperature lubricating grease, through the combination use under double -deck welding type heat preservation mechanism, mechanical seal flushing mechanism, axial thrust mechanism, can completely realize the safe long -life pumping of high temperature lubricating grease, pulsation is low, no shear, and this method is simple, economic, continuous, is suitable for the conveying process of high temperature lubricating grease.

Description

Technical Field

[0001] This utility model relates to the field of three-screw pump technology, specifically a three-screw pump for conveying high-temperature lubricating grease. Background Technology

[0002] The three-screw pump is a pulsation-free, axially dissipative, low-pressure rotor pump that delivers media with a certain degree of lubricity. It is suitable for conveying oils such as fuel oil, lubricating oil, hydraulic oil, and mineral oil, as well as other fluid liquids with lubricating properties.

[0003] High-temperature grease has good film strength and load-bearing capacity. It will not dry out or form components that are detrimental to lubrication under high temperatures. It is suitable for lubrication of various bearings, gears, chains and other transmission mechanical parts in high-temperature environments. At room temperature, its viscosity is high and its fluidity is poor. If high-temperature grease is excessively stirred or mixed with gas during transportation, it will bring great hidden dangers to its performance. If the transportation temperature can be increased and the pump chamber can be insulated to maintain a semi-liquid state with a certain viscosity during pumping, the specific transportation of high-temperature grease can be achieved.

[0004] Therefore, a three-screw pump for conveying high-temperature lubricating grease is proposed to solve the problems mentioned above. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a three-screw pump for conveying high-temperature lubricating grease, which can meet the conveying needs of equipment manufacturers for conveying high-temperature and high-viscosity materials. It has a long service life, can also achieve variable frequency pressure regulation, and has a high degree of automation.

[0006] To achieve the above objectives, this utility model provides the following technical solution: including a double-layer insulated pump body, a shaft seal, a screw, a double-layer welded insulation mechanism for the double-layer insulated pump body, a mechanical seal flushing mechanism for the shaft seal, and an axial thrust mechanism for the screw.

[0007] Preferably, the double-layer welded insulation mechanism consists of a material inlet flange, a high-pressure drain port, a low-pressure drain port, a material outlet flange, an insulation liquid inlet port, an insulation liquid outlet port, a safety valve high-pressure port, a safety valve low-pressure port, and a high-pressure measurement port.

[0008] Preferably, the material inlet flange and the high-pressure drain port are located on the same side of the double-layer insulated pump body, the low-pressure drain port and the material outlet flange are located on the same side of the double-layer insulated pump body, the high-pressure drain port, the insulation liquid inlet port, and the high-pressure measurement port are located on the same side of the double-layer insulated pump body, and the low-pressure drain port and the insulation liquid outlet port are located on the same side of the double-layer insulated pump body.

[0009] Preferably, the mechanical seal flushing mechanism consists of a mechanical seal buffer inlet, a mechanical seal buffer outlet, a buffer flow outlet, a buffer flow return outlet, a cooling water interface one, and a cooling water interface two.

[0010] Preferably, the mechanical seal flushing mechanism is installed vertically, and the mechanical seal buffer inlet, mechanical seal buffer outlet, buffer return port, cooling water interface one, cooling water interface two, and buffer outlet are supported in a circulating flow configuration.

[0011] Preferably, the axial thrust mechanism comprises a cartridge mechanical seal, bearings, bearing housing, mechanical seal chamber, main rod, balance sleeve, double-layer insulated pump body, thrust sleeve assembly, bushing, safety valve components, driven rod, and front cover.

[0012] Preferably, the bearing is installed in the bearing housing and is externally mounted. The bearing is used for axial positioning of the main rod. The main rod is used to drive the two driven rods to rotate. Several sealing cavities are formed between the driven rods and the bushing. The main rod is inserted into the interior of the cartridge mechanical seal. The cartridge mechanical seal and the mechanical seal chamber are installed through end face sealing. The high-pressure end face of the bushing is connected to the front cover, and the low-pressure end face of the bushing is connected to the thrust sleeve assembly. The thrust sleeve assembly and the balance sleeve are used for axial thrust support of the screw.

[0013] Compared with the prior art, this utility model provides a three-screw pump for conveying high-temperature lubricating grease, which has the following beneficial effects:

[0014] 1. Through the design of a double-layer welded pump body with heat preservation function, it can introduce high-pressure materials into the low-pressure chamber when there is overpressure during the pumping of high-temperature lubricating grease.

[0015] 2. By using a shaft seal design with a mechanical seal flushing system, it can always operate in a set temperature environment, reliably solving the shaft seal problem of high-temperature grease.

[0016] 3. Through the screw design with axial thrust function, the screw is thrust-resistant, axial and radially positioned when the material conveying pressure is unstable, thus extending the service life of the high-temperature grease conveying three-screw pump.

[0017] 4. By combining a double-layer welded insulation mechanism, a mechanical seal flushing mechanism, and an axial thrust mechanism, safe and long-life pumping of high-temperature grease can be fully realized, with low pulsation and no shearing. This method is simple, economical, and continuous, and is suitable for the delivery process of high-temperature grease. Attached Figure Description

[0018] Figure 1This is a schematic diagram of the AB cross-sectional structure of the double-layer welded insulation mechanism of this utility model;

[0019] Figure 2 This is a side sectional view of the double-layer welded insulation mechanism of this utility model.

[0020] Figure 3 This is a schematic diagram of the cross-sectional structure of the double-layer welded insulation mechanism of this utility model;

[0021] Figure 4 This is a schematic diagram of the double-layer welded insulation mechanism BB of this utility model;

[0022] Figure 5 This is a front view structural diagram of the mechanical seal flushing mechanism of this utility model;

[0023] Figure 6 This is a top view schematic diagram of the mechanical seal flushing mechanism of this utility model;

[0024] Figure 7 This is a schematic diagram of the vertical structure of the mechanical seal flushing mechanism of this utility model;

[0025] Figure 8 This is a cross-sectional schematic diagram of the axial thrust mechanism of this utility model.

[0026] In the diagram: 1. Carrier-type mechanical seal; 2. Bearing; 3. Bearing housing; 4. Mechanical seal chamber; 5. Main rod; 6. Balance sleeve; 7. Double-layer insulated pump body; 701. Material inlet flange; 702. High-pressure drain port; 703. Low-pressure drain port; 704. Material outlet flange; 705. Insulation liquid inlet port; 706. Insulation liquid outlet port; 707. Safety valve high-pressure port; 708. Safety valve low-pressure port; 709. High-pressure measurement port; 8. Thrust sleeve assembly; 9. Bushing; 10. Safety valve component; 11. Driven rod; 12. Front cover; 13. Mechanical seal buffer outlet; 1301. Mechanical seal buffer inlet; 1401. Buffer outlet; 1402. Buffer return port; 1403. Cooling water interface one; 1404. Cooling water interface two. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Example:

[0029] Please see Figure 1 - Figure 8 The three-screw pump for conveying high-temperature grease in this embodiment includes a double-layer insulated pump body 7, a shaft seal, a screw, a double-layer welded insulation mechanism for the double-layer insulated pump body 7, a mechanical seal flushing mechanism for the shaft seal, and an axial thrust mechanism for the screw.

[0030] The design of the double-layer insulated pump body 7 with double-layer welding and heat insulation function enables it to introduce high-pressure materials into the low-pressure chamber when there is overpressure during the pumping process of conveying high-temperature lubricating grease.

[0031] By employing a shaft seal design with a mechanical seal flushing system, it can operate continuously within a set temperature environment, reliably solving the shaft seal problem of high-temperature grease.

[0032] By using a screw design with axial thrust function, the screw can be thrusted, and the axial and radial positioning functions can be achieved when the material conveying pressure is unstable, thus extending the service life of the high-temperature grease conveying three-screw pump.

[0033] By combining a double-layer welded insulation mechanism, a mechanical seal flushing mechanism, and an axial thrust mechanism, safe and long-life pumping of high-temperature grease can be fully realized, with low pulsation and no shearing. This method is simple, economical, and continuous, and is suitable for the delivery process of high-temperature grease.

[0034] The double-layer welded insulation mechanism consists of a material inlet flange 701, a high-pressure drain port 702, a low-pressure drain port 703, a material outlet flange 704, an insulation liquid inlet port 705, an insulation liquid outlet port 706, a safety valve high-pressure port 707, a safety valve low-pressure port 708, and a high-pressure measurement port 709.

[0035] Material inlet flange 701 and high pressure drain port 702 are located on the same side of double-layer insulated pump body 7; low pressure drain port 703 and material outlet flange 704 are located on the same side of double-layer insulated pump body 7; high pressure drain port 702, insulation liquid inlet port 705, and high pressure measuring port 709 are located on the same side of double-layer insulated pump body 7; low pressure drain port 703 and insulation liquid outlet port 706 are located on the same side of double-layer insulated pump body 7.

[0036] Conventional three-screw pump bodies have a medium inlet, a medium outlet, and high and low pressure discharge ports. They are single-layer designs with simple structures and can function as pressure pump bodies for non-insulated fluids. The technical solution proposed in this paper is a double-layer welded pump body with insulation.

[0037] like Figures 1-4The diagram shows a double-layer welded pump body with insulation. Material inlet flange 701 is the material inlet; high-temperature grease is drawn in by vacuum or fed in under positive pressure through this flange. High-pressure drain port 702 is for high-pressure draining; if the high-pressure pump chamber (i.e., the pump outlet pipeline) needs to be drained or vented, a valve can be connected through this port. Low-pressure drain port 703 is for low-pressure draining; if the low-pressure pump chamber (i.e., the pump inlet pipeline) needs to be drained or vented, a valve can be connected through this port. Material outlet flange 704 is the material outlet; high-temperature grease is pressurized and pumped out through this flange. Insulation liquid inlet port 704... 05 and the insulation liquid outlet interface 706 are the insulation liquid inlet and outlet, respectively. These two inlet and outlet connectors can interchange the material inlet and outlet directions, because they only need to ensure that the insulation medium entering the pump cavity keeps the pump chamber warm and that one inlet and one outlet function is achieved. The high pressure port 707 and the low pressure port 708 of the safety valve are the same as the interfaces of the safety valve body. When the outlet pressure is higher than the set pressure, the valve core inside the safety valve will overcome the elastic force of the set pre-tightening spring and open, releasing the conveyed material from the high pressure end to the low pressure end, thus achieving the pressure protection function. The high pressure measurement interface 709 is for high pressure measurement and can be connected to a pressure gauge or temperature measuring device to test the actual pressure and temperature values ​​of the conveyed fluid.

[0038] The mechanical seal flushing mechanism consists of a mechanical seal buffer inlet 1301, a mechanical seal buffer outlet 13, a buffer flow outlet 1401, a buffer flow return port 1402, a cooling water interface one 1403, and a cooling water interface two 1404.

[0039] The mechanical seal flushing mechanism is installed vertically, and the mechanical seal buffer inlet 1301, mechanical seal buffer outlet 13, buffer return port 1402, cooling water interface 1403, cooling water interface 2 1404, and buffer outlet 1401 are supported in a circulating flow configuration.

[0040] Because the grease is in contact with the high-temperature medium on the dynamic and stationary ring surfaces of the mechanical seal, and the heat generated during the sealing process, if the temperature of this contact surface is not controlled, it is easy to cause high-temperature failure or wear without liquid film on the contact surface of the dynamic and stationary rings. Therefore, this device is designed with a shaft seal with a mechanical seal flushing system. The mechanical seal buffer is introduced into the inlet and outlet pipelines of the cartridge mechanical seal 1, and the mechanical seal buffer is cooled by heat conduction, so that it always works in the set temperature environment, and reliably realizes the shaft sealing function of high-temperature grease.

[0041] like Figures 5-7As shown, this is a shaft seal design scheme with a mechanical seal flushing system. The cartridge mechanical seal 1 installed on the pump body has two interfaces: a mechanical seal buffer inlet 1301 and a mechanical seal buffer outlet 13. The flushing system is installed vertically. The buffer outlet 1401 is for buffer outflow, and the buffer return port 1402 is for buffer return. Cooling water interface one 1403 and cooling water interface two 1404 are both cooling water interfaces. The buffer enters the mechanical seal buffer inlet 1301 through the pipeline, carrying away the heat generated by the dynamic and stationary rings of the mechanical seal. Then it flows out from the mechanical seal buffer outlet 13 and returns to the buffer return port 1402. After flowing through the coil in the flushing system, the buffer exchanges heat with the water in the cooling water interfaces one 1403 and cooling water interface two 1404 before returning to the mechanical seal.

[0042] The axial thrust mechanism consists of a cartridge mechanical seal 1, bearing 2, bearing housing 3, mechanical seal chamber 4, main rod 5, balance sleeve 6, double-layer insulated pump body 7, thrust sleeve assembly 8, bushing 9, safety valve component 10, follower rod 11, and front cover 12.

[0043] Bearing 2 is installed in bearing housing 3 and is externally mounted. Bearing 2 is used for axial positioning of main rod 5. Main rod 5 is used to drive two driven rods 11 to rotate. Several sealing cavities are formed between driven rods 11 and bushing 9. Main rod 5 is inserted into the inside of cartridge mechanical seal 1. Cartridge mechanical seal 1 and mechanical seal chamber 4 are installed by end face sealing. The high pressure side end face of bushing 9 is connected to front cover 12. The low pressure side end face of bushing 9 is connected to thrust sleeve assembly 8. Thrust sleeve assembly 8 and balance sleeve 6 are used for axial thrust support of screw.

[0044] Considering that the viscosity of grease is very low and its lubricity is poor at high temperatures, the axial force of the screw needs to be controlled by a friction pair with a thrust-resistant function. In principle, this is the only way to achieve the long service life requirement of the three-screw pump for high-temperature grease flow pumps. The designed thrust sleeve assembly 8 not only limits the radial movement of the main rod 5 and the driven rod 11, but also provides axial thrust resistance to the driven rod 11. The designed balance sleeve 6 also achieves radial and axial limiting of the driven rod 11. In this way, when the pressure of the conveyed material changes, the axial force of the screw is balanced, thus extending the service life of the high-temperature grease pump.

[0045] like Figure 8As shown, the bearing 2 installed in the bearing housing 3 is an external design and does not directly contact the conveyed material. The main rod 5 is axially positioned by the bearing 2 and has no axial movement. The main rod 5 actively rotates, driving the two driven rods 11 to rotate. Several sealed cavities are formed between the driven rods 11 and the bushing 9. The material entering the sealed cavity will be pressurized step by step and conveyed from the low-pressure end to the discharge end. The main rod 5 passes through the cartridge mechanical seal 1. The cartridge mechanical seal 1 and the mechanical seal chamber 4 are installed through end face sealing. The outer diameter of the connecting bushing 9 matches the inner diameter of the double-layer heat-insulated pump body 7. The high-pressure end face is connected to the front cover 12, and the low-pressure end face is connected to the thrust sleeve assembly 8. The thrust sleeve assembly 8 and the balance sleeve 6 can realize the axial thrust resistance of the screw. It is made of wear-resistant and low-roughness materials to meet the thrust resistance function.

[0046] The working principle of the above embodiments is as follows:

[0047] In use, this device features a double-layer welded pump body with insulation. During the pumping of high-temperature lubricating grease, the insulation liquid introduced into the double-layer insulated pump body 7 ensures the material's conveying temperature, reduces its viscosity, and makes it more suitable for degassing and conveying. Simultaneously, the designed high-pressure and low-pressure drain ports drain the material from the high-pressure and low-pressure chambers respectively. The high-pressure port 707 and low-pressure port 708 of the safety valve can connect to the safety valve body, allowing high-pressure material to be introduced into the low-pressure chamber in case of overpressure. Through a shaft seal design with a mechanical seal flushing system, the mechanical seal buffer is introduced into the inlet and outlet pipelines of the cartridge mechanical seal 1, and heat conduction and cooling are performed on the mechanical seal buffer to ensure continuous operation at a constant temperature. Under the set temperature environment, the shaft sealing problem of high-temperature grease was reliably solved. Through the screw design with axial thrust function, especially the design of the thrust sleeve assembly 8 and the balance sleeve 6, and the use of wear-resistant and low-roughness materials, the thrust function, axial and radial positioning function of the screw were achieved when the material conveying pressure was unstable, thus extending the service life of the three-screw pump for high-temperature grease delivery. The viscosity of grease decreases and its lubricity deteriorates at high temperatures. When the gas content is high, there will be some noise and vibration. However, the solution introduced in this device with the above three major breakthrough designs can completely realize the safe and long-life pumping of high-temperature grease with low pulsation and no shearing. This method is simple, economical and continuous, and suitable for the high-temperature grease delivery process.

[0048] The installation method, connection method, or setting method disclosed in this embodiment are all common mechanical connections.

[0049] Any connection method that can achieve its beneficial effect can be implemented, so the specific structural composition and working principle will not be described in detail in this embodiment.

[0050] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0051] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A three-screw pump for conveying high-temperature lubricating grease, comprising a double-layer insulated pump body (7), a shaft seal, and a screw, characterized in that: And a double-layer welded insulation mechanism for the double-layer insulated pump body (7), a mechanical seal flushing mechanism for the shaft seal, and an axial thrust mechanism for the screw; The double-layer welded insulation mechanism consists of a material inlet flange (701), a high-pressure drain port (702), a low-pressure drain port (703), a material outlet flange (704), an insulation liquid inlet port (705), an insulation liquid outlet port (706), a safety valve high-pressure port (707), a safety valve low-pressure port (708), and a high-pressure measurement port (709). The mechanical seal flushing mechanism consists of a mechanical seal buffer inlet (1301), a mechanical seal buffer outlet (13), a buffer flow outlet (1401), a buffer flow return port (1402), a cooling water interface one (1403), and a cooling water interface two (1404); The axial thrust mechanism consists of a cartridge mechanical seal (1), a bearing (2), a bearing housing (3), a mechanical seal chamber (4), a main rod (5), a balance sleeve (6), a double-layer insulated pump body (7), a thrust sleeve assembly (8), a bushing (9), a safety valve component (10), a follower rod (11), and a front cover (12).

2. The three-screw pump for conveying high-temperature lubricating grease according to claim 1, characterized in that: The material inlet flange (701) and the high-pressure drain port (702) are located on the same side of the double-layer insulated pump body (7). The low-pressure drain port (703) and the material outlet flange (704) are located on the same side of the double-layer insulated pump body (7). The high-pressure drain port (702), the insulation liquid inlet port (705), and the high-pressure measurement port (709) are located on the same side of the double-layer insulated pump body (7). The low-pressure drain port (703) and the insulation liquid outlet port (706) are located on the same side of the double-layer insulated pump body (7).

3. The three-screw pump for conveying high-temperature lubricating grease according to claim 1, characterized in that: The mechanical seal flushing mechanism is installed vertically, and the mechanical seal buffer inlet (1301), mechanical seal buffer outlet (13), buffer return port (1402), cooling water interface one (1403), cooling water interface two (1404), and buffer outlet (1401) are supported in a circulating flow.

4. The three-screw pump for conveying high-temperature lubricating grease according to claim 1, characterized in that: The bearing (2) is installed in the bearing housing (3) and is externally mounted. The bearing (2) is used for axial positioning of the main rod (5). The main rod (5) is used to drive the two slave rods (11) to rotate. Several sealing cavities are formed between the slave rods (11) and the bushing (9). The main rod (5) is inserted into the inside of the cartridge mechanical seal (1). The cartridge mechanical seal (1) and the mechanical seal chamber (4) are installed by end face sealing. The high-pressure side end face of the bushing (9) is connected to the front cover (12). The low-pressure side end face of the bushing (9) is connected to the thrust sleeve assembly (8). The thrust sleeve assembly (8) and the balance sleeve (6) are used for axial thrust support of the screw.

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