Deep-well type three-screw pump

Abstract

This utility model provides a deep-well three-screw pump, including a mounting cylinder, a flange ring, a pump body, and a driver. The mounting cylinder has a cavity, and a first outlet is provided on the top side wall of the mounting cylinder; the bottom end of the mounting cylinder extends into an oil tank; the flange ring is fitted around the outer circumference of the mounting cylinder for fixing the mounting cylinder to the oil tank; the pump body is located at the bottom end of the mounting cylinder and has an input end extending into the cavity, the input end being coaxially connected to a connecting shaft coaxially arranged with the cavity; the driver is fixed at the top end of the mounting cylinder and is dynamically connected to the connecting shaft. The deep-well three-screw pump provided by this utility model, by setting up a mounting cylinder, fixing the driver at the top end of the mounting cylinder, and setting the pump body at the bottom end of the mounting cylinder, increases the distance between the pump body and the driver, thereby ensuring that the pump body is always immersed in the medium, guaranteeing the normal operation and service life of the pump. It is also applicable to different oil tanks, enhancing its applicability.

Description

Technical Field

[0001] This utility model belongs to the field of positive displacement screw pump manufacturing technology, specifically relating to a deep well three-screw pump. Background Technology

[0002] Deep well three-screw pumps are mainly used for liquid transportation in deep wells or vertical installation conditions, and are widely used in oil extraction, groundwater extraction, shipbuilding, lubricating oil and diesel transportation.

[0003] In existing technologies, the three-screw pump and motor in traditional submersible installation units are connected by a coupling. Due to the short axial distance between the pump and motor, and the motor needing to be located outside the oil tank, the length of the pump extending into the oil tank is relatively short. In certain special environments, such as when the oil tank is high or the overall system installation space is limited, the liquid level in the tank may drop significantly after the system starts operating, making the three-screw pump unit unable to meet system requirements. When the liquid level in the tank drops below the pump inlet, the system cannot draw media, causing the three-screw pump to run dry, damaging it and shortening its service life. Furthermore, different pumps are required for different oil tank sizes, resulting in poor adaptability. Utility Model Content

[0004] This utility model provides a deep well three-screw pump, which aims to solve the problem in the prior art where the three-screw pump is installed in a submersible manner, and the pump cannot draw in the medium after the liquid level in the oil tank drops below the pump inlet, resulting in a reduced service life.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a deep well three-screw pump, comprising: The mounting cylinder has a cavity, and the top side wall of the mounting cylinder is provided with a first liquid outlet; the bottom end of the mounting cylinder extends into the oil tank; A flange ring is fitted around the outer circumference of the mounting cylinder for fixing the mounting cylinder to the oil tank. The pump body is located at the bottom end of the mounting cylinder and has an input end that extends into the cylinder cavity. The input end is coaxially connected to a connecting shaft that is coaxially arranged with the cylinder cavity. The driver is fixed at the top of the mounting cylinder and is poweredly connected to the connecting shaft.

[0006] In one possible implementation, the pump body input end is connected to the connecting shaft via a coupling sleeve.

[0007] In one possible implementation, the deep well three-screw pump further includes a safety valve disposed on the mounting cylinder and located above the flange ring; The mounting cylinder is provided with a flow port, and the safety valve is located at the flow port to control the opening and closing of the flow port.

[0008] In one possible implementation, the safety valve includes: A valve body is connected to the mounting cylinder. The valve body has a mounting cavity, in which a valve core is provided. The valve body is provided with a second liquid outlet communicating with the mounting cavity. A spring is disposed in the mounting cavity, with one end of the spring connected to the valve core and the other end connected to the spring seat.

[0009] In one possible implementation, the pump body includes: Protective cover, with a working chamber; An active screw is disposed in the working chamber and is connected to the connecting shaft; the input end is the connection end between the active screw and the connecting shaft. There are two driven screws, both of which are disposed in the working cavity. The two driven screws are located on both sides of the driving screw and are engaged and rotate with the driving screw.

[0010] In one possible implementation, the deep-well three-screw pump further includes a filter box connected to the pump body and located at the lower end of the pump body.

[0011] The beneficial effects of the deep-well three-screw pump provided by this utility model are as follows: Compared with the prior art, by setting an installation cylinder, the driver is fixed at the top of the installation cylinder, and the pump body is set at the bottom of the installation cylinder, thereby increasing the distance between the pump body and the driver. The installation cylinder has a cavity, and the connecting shaft is coaxially arranged with the cavity. A flange ring is fitted on the outer circumference of the installation cylinder, and the flange ring is used to fix the installation cylinder to the oil tank. The driver is poweredly connected to the connecting shaft, and the connecting shaft is coaxially connected to the input end of the pump body that extends into the cavity, so that the driver drives the connecting shaft to rotate, and the connecting shaft drives the pump body to work. A first liquid outlet is provided on the top side wall of the installation cylinder, and the liquid sucked in by the pump body is discharged through the first liquid outlet. In this application, the installation cylinder and the connecting shaft lengthen the distance between the driver and the pump body, so that the pump body can always be immersed in the medium, ensuring the normal operation and service life of the pump. At the same time, it can also be applied to different oil tanks, enhancing its applicability. Attached Figure Description

[0012] Figure 1 A schematic diagram of the structure of the deep well three-screw pump provided in this embodiment of the utility model; Figure 2 Schematic cross-sectional view of the deep well three-screw pump provided in this embodiment of the utility model Figure 1 ; Figure 3Schematic cross-sectional view of the deep well three-screw pump provided in this embodiment of the utility model Figure 2 ; Figure 4 Schematic cross-sectional view of the deep well three-screw pump provided in this embodiment of the utility model Figure 3 .

[0013] Explanation of reference numerals in the attached figures: 10. Mounting cylinder; 11. First outlet; 12. Cylinder cavity; 20. Flange ring; 30. Pump body; 31. Driving screw; 32. Protective cover; 33. Driven screw; 40. Driver; 50. Connecting shaft; 60. Coupling sleeve; 70. Safety valve; 71. Valve body; 72. Spring; 73. Spring seat; 80. Filter box. Detailed Implementation

[0014] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0015] It should be noted that the terms "length", "width", "height", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", and "tail" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and 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 utility model.

[0016] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0017] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Additionally, "multiple" and "several" mean two or more, unless otherwise explicitly specified.

[0018] Please refer to the following: Figures 1 to 4 The present invention provides a description of a deep-well three-screw pump. The deep-well three-screw pump includes a mounting cylinder 10, a flange ring 20, a pump body 30, and a driver 40. The mounting cylinder 10 has a cavity 12, and a first outlet 11 is provided on the top side wall of the mounting cylinder 10. The bottom end of the mounting cylinder 10 extends into an oil tank. The flange ring 20 is fitted around the outer circumference of the mounting cylinder 10 to fix the mounting cylinder 10 to the oil tank. The pump body 30 is located at the bottom end of the mounting cylinder 10 and has an input end extending into the cavity 12. The input end is coaxially connected to a connecting shaft 50 coaxially arranged with the cavity 12. The driver 40 is fixed to the top end of the mounting cylinder 10 and is poweredly connected to the connecting shaft 50.

[0019] In this embodiment, the mounting cylinder 10 has a cavity 12, and its bottom end extends into the oil tank. A first liquid outlet 11 is provided on the top side wall of the mounting cylinder 10. A flange ring 20 is provided on the outer periphery of the mounting cylinder 10, which is used to fix the mounting cylinder 10 to the oil tank. The pump body 30 is located at the bottom end of the mounting cylinder 10 and has an input end extending into the cavity 12. A connecting shaft 50 is coaxially connected to the input end, and the connecting shaft 50 is coaxially arranged with the cavity 12. The driver 40 is fixed to the top end of the mounting cylinder 10 and is poweredly connected to the connecting shaft 50.

[0020] The deep-well three-screw pump provided in this embodiment of the utility model, compared with the prior art, increases the distance between the pump body 30 and the driver 40 by setting an installation cylinder 10, with the driver 40 fixed at the top of the installation cylinder 10 and the pump body 30 set at the bottom of the installation cylinder 10. The installation cylinder 10 has a cylinder cavity 12, and the connecting shaft 50 is coaxially arranged with the cylinder cavity 12. A flange ring 20 is sleeved on the outer periphery of the installation cylinder 10, which is used to fix the installation cylinder 10 to the oil tank. The driver 40 is poweredly connected to the connecting shaft 50, and the connecting shaft 50 is coaxially connected to the input end of the pump body 30 that extends into the cylinder cavity 12, so that the driver 40 drives the connecting shaft 50 to rotate, and the connecting shaft 50 drives the pump body 30 to work. A first liquid outlet 11 is provided on the top side wall of the installation cylinder 10, and the liquid sucked in by the pump body 30 is discharged through the first liquid outlet 11. In this application, the mounting cylinder 10 and connecting shaft 50 extend the distance between the driver 40 and the pump body 30, thereby ensuring that the pump body 30 is always immersed in the medium, guaranteeing the normal operation and service life of the pump. It also allows for application to different oil tanks, enhancing its versatility.

[0021] In the above embodiment, the pump body 30 is semi-submersible, meaning that a portion of the pump body 30 (typically the inlet section or the lower half of the entire pump body 30) is submerged in the liquid to be transported. The driver 40 is completely above the liquid surface and exposed to air. The installation depth of the pump body 30 in the oil tank can be customized according to the user's oil tank depth requirements, and the height of the flange ring 20 can also be customized, making it widely and flexibly applicable to different oil tanks with good applicability.

[0022] Furthermore, the first outlet 11 is located above the flange ring 20. The first outlet 11 discharges the medium horizontally, facilitating pipeline connection for the user. Using a lower outlet method (where the outlet faces upwards) would complicate on-site pipeline connections, waste materials, and increase costs.

[0023] In some embodiments, please refer to Figures 2 to 4 The pump body 30 input end is connected to the connecting shaft 50 via a coupling sleeve 60. Specifically, the connecting shaft 50 and the driver 40 are connected by a coupling. In this embodiment, the connecting shaft 50 and the driver 40 are connected by a coupling, which is an important component in mechanical transmission that connects two shafts (or shafts and other rotating parts) to transmit torque and motion. During installation and operation, the coupling can effectively compensate for alignment errors, absorb vibrations from the driver 40, prevent vibrations from being transmitted and amplified in the transmission chain, and improve operational stability. The pump body 30 input end is connected to the connecting shaft 50 via a coupling sleeve 60, which connects the two shafts by means of a key, pin, or interference fit to transmit torque. The connection between the pump body 30 input end and the connecting shaft 50 is located in the lower part of the cavity 12 of the mounting cylinder 10, and the use of a coupling sleeve 60 makes installation simple and highly reliable. If a flexible coupling is used, the elastic element is prone to contaminating the conveying medium after aging.

[0024] In some embodiments, please refer to Figures 1 to 4 The deep-well three-screw pump provided in this embodiment of the utility model also includes a safety valve 70, which is disposed on the mounting cylinder 10. The safety valve 70 is located above the flange ring 20. The mounting cylinder 10 is provided with a flow port, and the safety valve 70 is disposed at the flow port to control the opening and closing of the flow port. In this embodiment, when the outlet pressure is too high (the pressure at the liquid port can be measured by the pressure gauge mentioned above) or when there is a fault in the system pipeline, the flow port can be opened by the safety valve 70 to release the high-pressure medium and allow it to flow back to the oil tank. Alternatively, the medium can be guided to the required location according to customer needs, avoiding the medium from repeatedly circulating inside the pump body 30 and generating heat, which would lead to poor operation of the pump body 30 and affect the service life of the pump body 30.

[0025] In some embodiments, please refer to Figures 2 to 4The safety valve 70 includes a valve body 71 and a spring 72. The valve body 71 is connected to the mounting cylinder 10 and has a mounting cavity containing a valve core. A second outlet communicating with the mounting cavity is also provided on the valve body 71. The spring 72 is disposed in the mounting cavity, with one end connected to the valve core and the other end connected to a spring seat 73. In this embodiment, the opening pressure (also called the set pressure) of the safety valve 70 is set by adjusting the preload of the spring 72. When the pressure inside the equipment abnormally rises and reaches this preset value, the upward force of the medium acting on the valve core overcomes the downward preload of the spring 72, pushing the valve core upward, opening the valve, and beginning to release pressure. Once the valve is open, the valve core continues to rise. At this time, the spring 72 is further compressed, and the downward force it generates also increases. This makes the valve opening smooth, rather than suddenly bursting open, helping to avoid excessive pressure shocks and system fluctuations. When the pressure inside the equipment drops to a certain level (called the reseating pressure), the downward force of spring 72 is greater than the upward thrust of the medium, thus pushing the valve core back to its seat, resealing the valve, and closing it. Spring 72 ensures that safety valve 70 can close in a timely and effective manner, preventing the complete leakage of the medium, which would cause waste and production interruption.

[0026] In some embodiments, please refer to Figures 1 to 4 A flange is provided at the bottom of the mounting cylinder 10, and the mounting cylinder 10 is connected to the pump body 30 through the flange.

[0027] In some embodiments, please refer to Figures 2 to 4The pump body 30 includes a protective cover 32, a driving screw 31, and driven screws 33. The protective cover 32 has a working chamber. The driving screw 31 is disposed in the working chamber and is connected to the connecting shaft 50. The input end is the connection end between the driving screw 31 and the connecting shaft 50. There are two driven screws 33, both disposed in the working chamber, located on both sides of the driving screw 31, and both meshing with the driving screw 31 for transmission. In this embodiment, the threads of the driving screw 31 and the two driven screws 33 mesh with each other, and the tooth profiles of the driving screw 31 and the two driven screws 33, together with the inner wall of the pump body 30, constitute multiple isolated and sealed spiral cavities. These cavities are distributed along the axial direction of the screw. When the driving screw 31 rotates, it drives the driven screws 33 on both sides to rotate in the opposite direction. The driving screw 31 and the two driven screws 33 begin to mesh and separate at the suction end (pump inlet), and the meshing space gradually increases, forming a low-pressure zone (increased volume, decreased pressure). Under the action of the pressure difference, the liquid to be transported is drawn into the pump body 30 by atmospheric pressure or priming pressure, filling these spiral cavities. As the driving screw 31 and the two driven screws 33 continue to rotate, the liquid in the spiral cavities moves smoothly from the pump suction end to the discharge end along the axial direction of the screws. When the liquid reaches the discharge end of the pump body 30, the meshing between the driving screw 31 and the two driven screws 33 becomes tighter, the volume of the cavity gradually decreases, the liquid in the cavity is squeezed, the pressure rises rapidly, and it is eventually continuously pushed into the discharge pipe, completing the transport.

[0028] In some embodiments, please refer to Figures 1 to 4 The deep-well three-screw pump provided in this embodiment of the present invention also includes a filter box 80, which is connected to the pump body 30 and located at the lower end of the pump body 30. In this embodiment, the lower part of the pump body 30 is immersed in the oil tank medium. Installing the filter box 80 at the lower end of the pump body 30 can prevent particles from being sucked in and damaging the pump body 30, thus ensuring the service life of the pump body 30.

[0029] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A deep-well three-screw pump, characterized in that, include: The mounting cylinder has a cavity, and the top side wall of the mounting cylinder is provided with a first liquid outlet; the bottom end of the mounting cylinder extends into the oil tank; A flange ring is fitted around the outer circumference of the mounting cylinder for fixing the mounting cylinder to the oil tank. The pump body is located at the bottom end of the mounting cylinder and has an input end that extends into the cylinder cavity. The input end is coaxially connected to a connecting shaft that is coaxially arranged with the cylinder cavity. The driver is fixed at the top of the mounting cylinder and is poweredly connected to the connecting shaft.

2. The deep well three-screw pump as described in claim 1, characterized in that, The pump body input end is connected to the connecting shaft via a coupling sleeve.

3. The deep-well three-screw pump as described in claim 1, characterized in that, The deep well three-screw pump also includes a safety valve, which is disposed on the mounting cylinder and located above the flange ring; The mounting cylinder is provided with a flow port, and the safety valve is located at the flow port to control the opening and closing of the flow port.

4. The deep well three-screw pump as described in claim 3, characterized in that, The safety valve includes: A valve body is connected to the mounting cylinder. The valve body has a mounting cavity, in which a valve core is provided. The valve body is provided with a second liquid outlet communicating with the mounting cavity. A spring is disposed in the mounting cavity, with one end of the spring connected to the valve core and the other end connected to the spring seat.

5. The deep-well three-screw pump as described in claim 1, characterized in that, The pump body includes: Protective cover, with a working chamber; An active screw is disposed in the working chamber and is connected to the connecting shaft; the input end is the connection end between the active screw and the connecting shaft. There are two driven screws, both of which are disposed in the working cavity. The two driven screws are located on both sides of the driving screw and are engaged and rotate with the driving screw.

6. The deep well three-screw pump as described in claim 1, characterized in that, The deep well three-screw pump also includes a filter box, which is connected to the pump body and located at the lower end of the pump body.

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