Oil pump foot valve

Abstract

This utility model relates to a bottom valve for an oil pump, comprising a valve body having a valve cavity and inlet / outlet, a valve core movably disposed within the valve cavity and having an open and closed state, a first reset elastic member that tends to move the valve core towards the closed state, and an oil return mechanism. The oil return mechanism includes an oil return pipeline, a stop member movably disposed within the oil return pipeline, and a second reset elastic member. The free end of the oil return pipeline is not lower than the oil-gas interface of the oil storage tank where the oil pump is located. The stop member has an initial state and a closed state. When it is in the initial state, the oil return pipeline connects the valve cavity to the external atmosphere. When it is in the closed state, the stop member forms a blockage, preventing the valve cavity from connecting to the external atmosphere. The second reset elastic member tends to keep the stop member in the initial state. The oil return pipeline allows residual oil in the inlet pipe to flow back to the oil storage tank, effectively eliminating siphon pressure in the inlet pipe and preventing oil pump shut-off failure due to the siphon effect.

Description

Technical Field

[0001] This utility model relates to the field of bottom valve technology, specifically to a bottom valve for an oil pump. Background Technology

[0002] In oil transportation and storage systems, pressure control within the return oil pipeline is crucial for ensuring the safe and stable operation of the system. The siphon effect is a common phenomenon. When oil in the return oil pipeline flows continuously due to gravity, a negative pressure is generated, creating siphon pressure. This siphon pressure can cause oil to be continuously drawn out of the return oil pipeline, potentially leading to a series of problems if left uncontrolled. For example, in some oil pumping equipment, the siphon effect may prevent the equipment from shutting down properly, resulting in excessive oil extraction. This not only wastes oil but may also cause safety hazards such as oil leaks and environmental pollution. Furthermore, the presence of siphon pressure can affect the structural strength of the return oil pipeline. Prolonged exposure to this pressure can cause deformation and damage to the pipeline, thus affecting the normal operation of the entire oil transportation system. Utility Model Content

[0003] The purpose of this invention is to provide a bottom valve for an oil pump that effectively prevents the siphon effect.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model provides a bottom valve for an oil pump, which is installed at the bottom of the oil inlet pipe of the oil pump and includes: The valve body has a valve cavity, one end of which has an inlet for fluid to enter and the other end has an outlet for fluid to exit. A valve core, which is movably disposed within the valve cavity, has an open state that allows fluid to pass through the valve cavity and a closed state that prevents fluid from passing through the valve cavity; A first reset elastic element, disposed between the valve cavity and the valve core, gives the valve core a tendency to move toward the closed state; and, The oil return mechanism includes an oil return pipe connected to the valve body, a stop member movably disposed within the oil return pipe, and a second reset elastic member connecting the oil return pipe and the stop member. The free end of the oil return pipe is not lower than the oil-gas interface of the oil storage tank where the oil pump is located. The stop member has an initial state and a closed state. When the stop member is in the initial state, there is a gap between the stop member and the oil return pipe for fluid to pass through, allowing the oil return pipe to connect the valve chamber and the external atmosphere. When the stop member is in the closed state, the stop member forms a blockage within the oil return pipe, preventing the valve chamber from connecting with the external atmosphere. The second reset elastic member tends to keep the stop member in the initial state, controlled by the oil pump. The stop member can switch from the initial state to the closed state.

[0005] Preferably, the stop member includes a rod-shaped portion and a stop portion. The inner peripheral wall of the return oil pipeline on the inner side of the stop portion has a first mating portion extending towards the axis of the return oil pipeline, and the inner peripheral wall of the return oil pipeline on the outer side has a second mating portion extending towards the axis of the return oil pipeline. When the stop member is in the closed state, the stop portion abuts against the first mating portion and the two are tightly fitted to prevent fluid from passing through. When the stop member is in the initial state, the stop portion abuts against the second mating portion and a gap is formed between the two to allow fluid to pass through.

[0006] More preferably, the stop portion has a plurality of protrusions on the stop surface opposite to the second mating portion and / or on the mating surface opposite to the stop portion.

[0007] In some embodiments, the protrusion is hemispherical.

[0008] Preferably, guide portions are provided on the return oil pipes on the inner side of the first mating portion and the outer side of the second mating portion, respectively. The rod-shaped portion passes through the guide portion and can slide along its axial direction under the guidance of the guide portion. The second reset elastic member abuts between the stop portion and the guide portion on the inner side of the first mating portion.

[0009] Preferably, the stop is located at the end where the return oil line connects to the valve body.

[0010] Preferably, a filter plate is installed at the inlet, and the filter plate is covered with filter holes.

[0011] Preferably, the valve core includes a hemispherical valve core body and a rod connected to the valve core body, and a sealing ring is provided between the valve core body and the valve cavity.

[0012] More preferably, the sealing ring is a rubber ring.

[0013] Preferably, the valve body at the outlet has a guide seat, and the free end of the rod is disposed in the guide seat and can move in a set direction under the guidance of the guide seat.

[0014] Preferably, the valve cavity has a gradually decreasing diameter region along its outlet to inlet direction, and the minimum diameter of the gradually decreasing region is less than or equal to the maximum outer diameter of the valve core.

[0015] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art: This invention, by setting up a return oil mechanism, can return the remaining oil in the inlet pipe to the oil storage tank through the return oil pipeline, thereby effectively eliminating the siphon pressure in the inlet pipe and preventing the problem of oil pumping shutdown failure caused by the siphon effect.

[0016] The bottom valve of the oil pump of this utility model has a simple structure and high reliability. Attached Figure Description

[0017] Figure 1 A schematic diagram of the structure of the oil pump foot valve mounted on the oil inlet pipe according to Example 1; Figure 2 This is a schematic diagram of the structure of the bottom valve of the oil pump provided in Example 1; Figure 3 A bottom view of the bottom valve of the oil pump provided in Example 1; Figure 4 A top view of the bottom valve of the oil pump provided in Example 1; Figure 5 for Figure 4 A cross-sectional view on plane AA; Figure 6 for Figure 5 Enlarged schematic diagram of section I; Figure 7 for Figure 6 Enlarged schematic diagram of Part II; Figure 8 The diagram shows the structure of the oil return mechanism provided in Example 1 (not all oil return lines are shown), in which the stop is in the initial state; Figure 9 The diagram shows the structure of the oil return mechanism provided in Example 1 (not showing all oil return lines), in which the stop is in the closed state; Among them, 1. Valve body; 11. Valve cavity; 111. Gradient zone; 12. Inlet; 13. Outlet; 14. Filter plate; 15. Guide seat; 2. Valve core; 21. Valve core body; 22. Rod; 23. Sealing ring; 3. First reset elastic element; 4. Oil return mechanism; 41. Oil return pipeline; 411. First mating part; 412. Second mating part; 413. Guide part; 42. Stop part; 421. Stop part; 422. Rod-shaped part; 423. Protrusion; 43. Second reset elastic element; 5. Oil pump; 6. Oil inlet pipe; 7. Oil storage tank; 71. Oil-gas interface. Detailed Implementation

[0018] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0019] In the description of the embodiments of this utility model, it should be understood that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship as described above. Figure 1 The orientations shown are defined, such as "upper" for outlet 13 and "lower" for inlet 12. "Inner" refers to the position close to the center of valve chamber 11, and "outer" refers to the position far from the center of valve chamber 11. This is only for the convenience of describing the embodiments of this utility model and simplifying the description, and is not intended to 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, it should not be construed as a limitation on the embodiments of this utility model.

[0020] 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0021] In this embodiment of the invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0022] The following disclosure provides many different implementations or examples for different structures of the embodiments of the present invention. To simplify the disclosure of the embodiments of the present invention, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the embodiments of the present invention. Furthermore, reference numerals and / or reference letters may be repeated in different examples of the embodiments of the present invention; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.

[0023] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings. Example 1

[0024] A foot valve for an oil pump, such as Figure 1 As shown, it is installed at the bottom of the oil inlet pipe 6 of the oil pump 5 and submerged below the liquid surface of the oil storage tank 7. Figures 2 to 9 As shown, the bottom valve of the oil pump includes a valve body 1, a valve core 2, a first reset elastic element 3, and a return oil mechanism 4.

[0025] The valve body 1 has a valve cavity 11, with an inlet 12 for fluid to enter at one end and an outlet 13 for fluid to exit at the other end. In this embodiment, the outlet 13 and the inlet 12 are located at the upper and lower ends of the valve cavity 11, respectively. The valve cavity 11 has a gradually decreasing diameter region 111 along the direction from its outlet 13 to its inlet 12.

[0026] The valve core 2 is movably disposed within the valve cavity 11 and has an open state and a closed state. When the valve core 2 is in the open state, there is a gap between it and the inner wall of the valve cavity 11, thereby allowing fluid to pass through the valve cavity 11; when the valve core 2 is in the closed state, it is in contact with the inner wall of the valve cavity 11, thereby preventing fluid from passing through the valve cavity 11. Preferably, the valve core 2 includes a valve core body 21 and a rod 22 connected to the upper end of the valve core body 21. The valve core body 21 is hemispherical, and the maximum outer diameter of the valve core body 21 is greater than or equal to the minimum diameter of the transition region 111, so that the valve core body 21 can be in contact with the inner wall of the valve cavity 11, thereby forming a blockage to prevent fluid from passing through. To improve the sealing effect, a sealing ring 23 is provided at the upper end of the valve core body 21. The sealing ring 23 is preferably an O-ring 23, including but not limited to rubber materials. Preferably, the valve body 1 at outlet 13 has a guide seat 15 with a guide channel. The free end of the rod 22 is movably disposed in the guide channel on the guide seat 15, and can move along a set direction under the guidance of the guide seat 15. In this embodiment, the set direction is the up and down direction.

[0027] The first reset elastic element 3 is disposed between the valve cavity 11 and the valve core 2, giving the valve core 2 a tendency to move towards the closed state. In this embodiment, the first reset elastic element 3 is sleeved on the rod 22 and abuts against the guide seat 15 and the valve core body 21, and includes, but is not limited to, a spring.

[0028] The oil return mechanism 4 includes an oil return pipe 41 connected to the valve body 1, a stop 42 movably disposed within the oil return pipe 41, and a second reset elastic member 43 connecting the oil return pipe 41 and the stop 42. The stop 42 has an initial state and a closed state. When the stop 42 is in the initial state, there is a gap between the stop 42 and the oil return pipe 41, allowing the oil return pipe 41 to connect the valve chamber 11 and the external atmospheric environment (such as...). Figure 8 (As shown); when the stop member 42 is in the closed state, the stop member 42 forms a blockage in the return oil line 41, so that the valve chamber 11 is not connected to the external atmospheric environment (as shown). Figure 9 (As shown). The second reset elastic element 43, which is a spring, tends to keep the stop element 42 in its initial state. The free end of the return oil line 41 is not lower than the oil-gas interface 71 of the oil storage tank 7 where the oil pump 5 is located. Due to the gravity of the oil, it will generate pressure on the bottom valve. By ensuring that the free end of the return oil line 41 is not lower than the oil-gas interface 71, the pressure of the oil can be prevented from exerting a force on the stop element 42, thus keeping it in its normally open initial state under the force of the second reset elastic element 43. In addition, by adjusting the height of the return oil line 41, the height of the remaining oil in the inlet pipe 6 can also be controlled.

[0029] When the external oil pump 5 starts and operates, it increases the outward suction force within the inlet pipe 6. At this time, the stop member 42 overcomes the force of the second reset elastic member 43, which is compressed. The stop member 42 changes from its initial state to the closed state. As the closed mode of the inlet pipe 6 is established, the outward suction pressure inside the inlet pipe 6 continues to increase, thereby causing the valve core 2 to overcome the force of the first reset elastic member 3. The first reset elastic member 3 is compressed, and the valve core 2 switches from the closed state to the open state, allowing the oil to flow smoothly from the inlet 12 into the valve chamber 11 and from the outlet 13 into the inlet pipe 6, thus realizing the oil pumping operation. After the oil pumping operation is completed, the external oil pump 5 is turned off, and the outward suction force within the inlet pipe 6 disappears. At this time, the valve core 2 switches to the closed state under the action of the first reset elastic element 3, and the stop element 42 switches to the initial state under the action of the second reset elastic element 43. The oil in the oil inlet pipe 6 flows back to the oil storage tank 7 through the return oil pipeline 41 of the return oil mechanism 4, which can effectively eliminate the siphon pressure in the oil inlet pipe 6 and prevent the oil pumping shutdown failure caused by the siphon effect.

[0030] In this embodiment, the stop member 42 is located at the end where the return oil line 41 connects to the valve body 1. The stop member 42 includes a rod-shaped portion 422 and a stop portion 421. The inner peripheral wall of the return oil line 41 on the inner side of the stop portion 421 has a first mating portion 411 extending towards the axis of the return oil line 41, and the inner peripheral wall of the return oil line 41 on the outer side has a second mating portion 412 extending towards the axis of the return oil line 41. When the stop member 42 is in the closed state, the stop portion 421 abuts against the first mating portion 411 and the two are tightly fitted to prevent fluid from passing through. When the stop member 42 is in the initial state, the stop portion 421 abuts against the second mating portion 412 and a gap for fluid to pass through is formed between the two. Preferably, the stop surface opposite the stop portion 421 and the second mating portion 412 has a plurality of protrusions 423, and the protrusions 423 are hemispherical. In order to enable the stop 42 to move along the set route, guide portions 413 are respectively provided on the oil return pipe 41 on the inner side of the first mating part 411 and the outer side of the second mating part 412. The rod-shaped part 422 passes through the guide portion 413 and can slide along its axial direction under the guidance of the guide portion 413. The second reset elastic member 43 abuts between the stop 421 and the guide portion 413 on the inner side of the first mating part 411.

[0031] The foot valve of the oil pump also includes a filter plate 14 installed at the inlet 12, which is covered with filter holes. Oil may contain various impurities, such as sand, metal shavings, and dust. If these impurities enter the oil pump 5, they may cause wear and damage to the pump's impeller, seals, bearings, and other mechanical components. By installing the filter plate 14 at the foot valve inlet 12, these impurities can be effectively intercepted, extending the pump's service life.

[0032] Working principle: When the oil pump 5 is started, the stop member 42, under the action of the external suction force of the oil pump 5, overcomes the force of the second reset elastic member 43 and moves towards the first mating part 411. The second reset elastic member 43 is gradually compressed until the stop part 421 and the first mating part 411 are tightly fitted, and the stop member 42 changes from the initial state to the closed state. As the external suction pressure continues to increase, the valve core 2 overcomes the force of the first reset elastic member 3 and moves upward. The first reset elastic member 3 is gradually compressed, and the valve core 2 switches from the closed state to the open state. Oil can flow from the inlet 12 into the valve chamber 11 and from the outlet 13 into the oil inlet pipe 6, realizing the oil pumping operation.

[0033] After the oil pumping operation is completed, the oil pump 5 is turned off. Under the action of the first reset elastic member 3, the valve core 2 moves downward and fits tightly against the valve cavity 11, switching the valve core 2 to the closed state. Under the action of the second reset elastic member 43, the stop member 42 moves towards the second mating part 412, switching the stop member 42 to the initial state. In this state, due to the obstruction of the protrusion 423, there is a gap between the stop part 421 and the second mating part 412. The oil in the oil inlet pipe 6 can pass through this gap and flow back to the oil storage tank 7 through the return oil line 41, thereby effectively eliminating the siphon pressure in the oil inlet pipe 6.

[0034] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A bottom valve for an oil pump, said bottom valve being installed at the bottom of the oil inlet pipe (6) of an oil pump (5), characterized in that, The oil pump foot valve includes: The valve body (1) has a valve cavity (11) inside. One end of the valve cavity (11) has an inlet (12) for fluid to enter and the other end has an outlet (13) for fluid to exit. Valve core (2), which is movably disposed in the valve chamber (11), has an open state that allows fluid to pass through the valve chamber (11) and a closed state that prevents fluid from passing through the valve chamber (11); A first reset elastic element (3) is disposed between the valve cavity (11) and the valve core (2), giving the valve core (2) a tendency to move toward the closed state; and, The oil return mechanism (4) includes an oil return pipeline (41) connected to the valve body (1), a stop (42) movably disposed within the oil return pipeline (41), and a second reset elastic member (43) connected between the oil return pipeline (41) and the stop (42). The free end of the oil return pipeline (41) is not lower than the oil-gas interface (71) of the oil storage tank (7) where the oil pump (5) is located. The stop (42) has an initial state and a closed state. When the stop (42) is in the initial state, the stop (42) There is a gap between the valve chamber (11) and the return oil line (41) to allow fluid to pass through, so that the return oil line (41) connects the valve chamber (11) and the external atmospheric environment. When the stop member (42) is in the closed state, the stop member (42) forms a block in the return oil line (41) so that the valve chamber (11) is not connected to the external atmospheric environment. The second reset elastic member (43) makes the stop member (42) tend to remain in the initial state. Controlled by the oil pump (5), the stop member (42) can switch from the initial state to the closed state.

2. The bottom valve of the oil pump according to claim 1, characterized in that: The stop member (42) includes a rod-shaped part (422) and a stop part (421). The inner peripheral wall of the return oil pipeline (41) on the inner side of the stop part (421) has a first mating part (411) extending toward the axis of the return oil pipeline (41), and the inner peripheral wall of the return oil pipeline (41) on the outer side has a second mating part (412) extending toward the axis of the return oil pipeline (41). When the stop (42) is in the closed state, the stop (421) abuts against the first mating part (411) and the two fit tightly together to prevent fluid from passing through; When the stop (42) is in the initial state, the stop (421) abuts against the second mating part (412) and a gap is formed between them for fluid to pass through.

3. The bottom valve of the oil pump according to claim 2, characterized in that: The stop portion (421) has a plurality of protrusions (423) on the stop surface opposite to the second mating portion (412) and / or on the mating surface opposite to the stop portion (421).

4. The bottom valve of the oil pump according to claim 3, characterized in that: The protrusion (423) is hemispherical.

5. The bottom valve of the oil pump according to claim 2, characterized in that: Guide portions (413) are respectively provided on the oil return pipe (41) on the inner side of the first mating part (411) and the outer side of the second mating part (412). The rod-shaped part (422) passes through the guide portion (413) and can slide along its axial direction under the guidance of the guide portion (413). The second reset elastic member (43) abuts against the guide portion (413) inside the stop portion (421) and the first mating portion (411).

6. The bottom valve of the oil pump according to claim 1, characterized in that: The stop (42) is located at the end where the return oil line (41) connects to the valve body (1).

7. The bottom valve of the oil pump according to claim 1, characterized in that: A filter plate (14) is installed at the inlet (12), and the filter plate (14) is covered with filter holes.

8. The bottom valve of the oil pump according to claim 1, characterized in that: The valve core (2) includes a hemispherical valve core body (21) and a rod (22) connected to the valve core body (21). A sealing ring (23) is provided between the valve core body (21) and the valve cavity (11).

9. The bottom valve of the oil pump according to claim 8, characterized in that: The valve body (1) at the outlet (13) has a guide seat (15), and the free end of the rod (22) is located in the guide seat (15) and can move in a set direction under the guidance of the guide seat (15).

10. The bottom valve of the oil pump according to claim 1, characterized in that: The valve cavity (11) has a gradually decreasing diameter region (111) along its outlet (13) to inlet (12), the minimum diameter of the gradually decreasing region (111) being less than or equal to the maximum outer diameter of the valve core (2).

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