Petroleum delivery multi-pipeline check valve

Abstract

The invention relates to the technical field of valves, in particular to an oil delivery multi-pipeline check valve which comprises a valve body, a delivery pipeline is arranged in the valve body, an upper valve seat is mounted above the valve body, a valve element is slidably arranged in the upper valve seat, and the valve element can move up and down in the upper valve seat. A valve element is installed in the upper valve seat and opens and closes the conveying pipeline, a limiting spring is installed on the upper end face of the valve element, a valve deck is installed in the upper valve seat, and the top end of the limiting spring makes contact with the inner wall of the valve deck. When the flow speed of conveyed petroleum is larger than the pressure of the limiting spring, the valve element moves upwards and compresses the limiting spring, the valve body is in an open state at the moment, then conveyed petroleum is conveyed out of the other end of the valve body, and when the conveying flow speed of the petroleum is reduced or stopped, the valve element moves upwards under the action of the limiting spring and the gravity of the valve element. When the oil flows back, the oil falls back to the valve seat in the valve body, and the valve body is in a closed state, so that the oil can be prevented from flowing back, and the oil can be conveniently conveyed.

Description

Technical Field

[0001] The invention relates to the technical field of valves, in particular to a multi-pipeline check valve for oil transportation. Background Art

[0002] A check valve is a valve whose opening and closing part is a circular disc and which relies on its own weight and medium pressure to produce movement to block the backflow of the medium. It is an automatic valve and is also called a non-return valve, one-way valve, reflux valve or isolation valve. Existing check valves need to ensure sealing when in use.

[0003] The prior art also proposes some solutions. For example, a patent with announcement number CN217081548U discloses a check valve, a check valve body, and a baffle structure installed in the check valve body. The baffle structure includes a baffle body, a sealing gasket, a connecting plate and a connecting column. A number of tooth grooves are evenly opened on the outer wall of the baffle body. The sealing gasket is sleeved on the baffle body, the connecting plate is installed on the outer wall of the baffle body, the connecting column is installed on the connecting plate, and a mounting slider is slidably installed on the connecting plate. By providing a mounting slider, a fastening structure and a fastening spring, the opening of the sealing gasket can be pressed tightly against the baffle body, thereby further enhancing the adhesion and stability of the connection between the baffle body and the sealing gasket.

[0004] Although the above technical solution enhances the adhesion and stability of the connection between the baffle body and the sealing gasket, there are still other problems during specific use. For example, under long-term oil transportation, some impurities will inevitably adhere to the spring surface inside the valve body, resulting in the valve core and the valve seat being unable to be completely sealed. Under the condition of multiple pipelines in parallel, the failure of a single-line seal will destroy the pressure balance, causing other pipelines to overload and accelerate the wear of the sealing surface.

[0005] To this end, the present invention provides a multi-pipeline check valve for petroleum transportation. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a multi-pipeline check valve for petroleum transportation, including a valve body, a transportation pipeline is opened inside the valve body, an upper valve seat is installed above the valve body, a valve core is slidably arranged inside the upper valve seat, the valve core can move up and down inside the upper valve seat and open and close the transportation pipeline, a limit spring is installed on the upper end surface of the valve core, a valve cover is installed inside the upper valve seat, and the top end of the limit spring contacts the inner wall of the valve cover.

[0007] In an embodiment of the present invention, a mating plate is installed at the bottom of the upper valve seat. A mating groove is formed on the surface of the mating plate. A mating ring is installed at the lower end surface of the valve core. The shape of the mating ring is adapted to the shape of the mating groove. During operation, when the conveying flow rate of the petroleum decreases or stops, and the valve core moves under the action of the limiting spring and its own gravity, the valve core will drive the mating ring to move downward. Then, the mating ring will fall into the mating groove. With the mutual cooperation of the mating ring and the mating groove, it can further prevent the reverse flow of petroleum when the valve body is closed.

[0008] In an embodiment of the present invention, a sliding rod is slidably arranged inside the valve cover. A vertical groove is formed on the inner wall of the valve cover. The sliding rod is slidably arranged inside the vertical groove. A first contact is installed at the bottom of the sliding rod. A second contact is installed on the groove wall of the vertical groove. The first contact and the second contact are designed on the same vertical line. A timing sensor is installed inside the valve cover.

[0009] When the valve body is in the closed state, the first contact and the second contact are in contact. And at this time, the mating ring is located inside the mating groove, that is, at this time, it means that the valve core can completely seal the conveying pipeline inside the valve body, so that the petroleum will not flow back. At this time, it is marked as the normal state. When the valve body is used for the first time, that is, when the valve core is pressed, the valve core compresses the limiting spring and drives the sliding rod to move upward, so that the sliding rod drives the first contact to move away from the second contact. When the conveying flow rate of the petroleum decreases or stops, at this time, the timing sensor marks the stop time of the petroleum conveying. And when the valve core recovers under the elastic force of the limiting spring, that is, drives the first contact to gradually move to the above-mentioned normal state, when the first contact contacts the second contact again, at this time, the timing sensor marks the time point when the first contact contacts the second contact again. Calculate the difference between the current time point and the stop time point to obtain the normal recovery time of the valve core.

[0010] In an embodiment of the present invention, a flow sensor is installed on the outer side of the valve body. The flow sensor is used to monitor the conveying flow rate of the petroleum in the valve body. The shape of the sliding rod is adapted to the shape of the vertical groove. During operation, a flow sensor is designed inside the valve body. The flow sensor can monitor the petroleum inside the valve body in real time. And when the petroleum conveying inside the valve body stops, the flow sensor will transmit a signal to the timing sensor. Then, the timing sensor can time the recovery time of the valve core, so as to facilitate the valve core to block the valve body.

[0011] In an embodiment of the present invention, an electric push rod is installed near the top inside the upper valve seat. The valve cover is slidably arranged inside the upper valve seat. The telescopic end of the electric push rod contacts the end face of the valve cover. A groove adapted to the valve cover is arranged inside the upper valve seat.

[0012] In an embodiment of the present invention, a cleaning brush is provided on the inner wall of the upper valve seat. The cleaning brush can move on the inner wall of the upper valve seat and clean the impurities and petroleum existing on the surface of the limiting spring. During operation, when the petroleum transportation inside the valve body stops and the valve core moves down to return to the normal state, the cleaning brush can clean the limiting spring through the action of the cleaning brush inside the upper valve seat, avoiding the problem that too many impurities exist on the surface of the limiting spring and affecting the valve core to return to the normal state. Moreover, it can also avoid the problem that some impurities accumulate on the surface of the limiting spring for a long time and affect the upward movement of the valve core.

[0013] In an embodiment of the present invention, a shielding groove is provided on the inner wall of the upper valve seat. The shape of the shielding groove is adapted to the shape of the cleaning brush. A baffle is slidably provided on the groove wall of the shielding groove, and an electric telescopic column is installed on the inner wall of the shielding groove. The telescopic end of the electric telescopic column is connected to the side wall of the cleaning brush. During operation, when the valve core presses the limiting spring, that is, when the valve body is in the open state, the baffle is located outside the shielding groove and blocks the entire shielding groove. When the valve body changes from the open state to the closed state, by controlling the baffle to move upward, the baffle no longer blocks the shielding groove. Subsequently, by controlling the movement of the electric telescopic column, the electric telescopic column drives the cleaning brush to move, and the cleaning brush moves to one side of the limiting spring and contacts the limiting spring, thus facilitating the subsequent cleaning of the surface of the limiting spring.

[0014] In an embodiment of the present invention, a linkage bracket is installed on the side wall of the sliding rod. The side of the linkage bracket away from the sliding rod is connected to the side wall of the baffle. A vertical groove adapted to the baffle is provided on the inner wall of the upper valve seat. During operation, when the sliding rod moves upward under the pressure of the limiting spring, the sliding rod drives the baffle to move upward through the linkage bracket, and the baffle blocks the shielding groove. When the sliding rod moves downward, the sliding rod drives the baffle to move downward through the linkage bracket, that is, the baffle no longer blocks the shielding groove. Subsequently, under the movement of the above-mentioned electric telescopic column, the cleaning brush can be driven to move and clean. In this way, when there is petroleum transportation inside the pipeline, the baffle is in the blocking state, which is convenient for the subsequent use of the cleaning brush.

[0015] In an embodiment of the present invention, the telescopic end of the electric telescopic column is of a telescopic design, and a spring is sleeved on its outer peripheral surface. An elastic limiting head is fixedly installed on the outer peripheral surface of the telescopic end of the electric telescopic column, and an arc-shaped head is installed on the groove wall of the shielding groove; during operation, when the telescopic end of the electric telescopic column drives the cleaning brush to move, the elastic limiting head at the telescopic end of the electric telescopic column will contact the arc-shaped head, and the arc-shaped head will squeeze and limit the elastic limiting head. As the telescopic end of the electric telescopic column continues to move, that is, when the elastic limiting head crosses the limit of the arc-shaped head, due to the telescopic design of the telescopic end of the electric telescopic column and the spring sleeved on its outer peripheral surface, the cleaning brush will strike the surface of the limiting spring under a relatively large force, causing the large impurities existing on the surface of the limiting spring to fall off, and during the subsequent oil transportation process, they will be transported away together, so as to facilitate the normal opening of the valve core driven by the limiting spring.

[0016] In an embodiment of the present invention, both the elastic limiting head and the arc-shaped head are arc-shaped.

[0017] The above technical solution of the present invention has the following advantages compared with the prior art: For the multi-pipeline check valve for oil transportation of the present invention, when the valve body is in the closed state, the first contact and the second contact are in contact, and at this time, the matching ring is located inside the matching groove, that is, at this time, it means that the valve core can completely seal the transportation pipeline inside the valve body, so that the oil will not flow back, and this is marked as the normal state at this time; when the valve body is used for the first time, that is, when the valve core is pressed, the valve core compresses the limiting spring and drives the sliding rod to move upward, so that the sliding rod drives the first contact away from the second contact. When the oil transportation flow rate decreases or stops, at this time, the timing sensor marks the stop time of the oil transportation, and when the valve core returns under the elastic force of the limiting spring, that is, when it drives the first contact to gradually move to the above-mentioned normal state, when the first contact contacts the second contact again, at this time, the timing sensor marks the time point when the first contact contacts the second contact again, and calculates the difference between the current time point and the stop time point to obtain the normal recovery time of the valve core; If in subsequent use, when the timing sensor receives the oil transportation stop signal, and the valve core does not return to the normal state position within the normal recovery time, and the timing sensor will transmit the signal to the controller, and the controller will issue an alarm. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to make the content of the present invention easier to be clearly understood, the following further details the present invention according to the specific embodiments of the present invention and in combination with the drawings.

[0019] Figure 1 is the three-dimensional structure schematic diagram of the present invention; Figure 2 is the upper valve seat structure schematic diagram of the present invention; Figure 3 is the valve body cross-sectional structure schematic diagram of the present invention; Figure 4 It is a schematic cross-sectional structure diagram of the upper valve seat in the present invention; Figure 5 In the present invention Figure 4 An enlarged view of the structure at position A; Figure 6 It is a schematic structural diagram of the valve core part in the present invention; Figure 7 It is a schematic structural diagram of the slide bar part in the present invention; Figure 8 It is a schematic cross-sectional structure diagram of the valve body in the present invention; Figure 9 It is a schematic structural diagram of the shielding groove part in the present invention; Figure 10 It is a schematic structural diagram of the electric telescopic column part in the present invention.

[0020] Explanation of the reference numerals in the drawings of the specification: 1. Valve body; 2. Delivery pipeline; 3. Upper valve seat; 301. Valve core; 4. Limit spring; 5. Valve cover; 501. Timing sensor; 6. Fitting plate; 601. Fitting groove; 7. Fitting ring; 8. Slide bar; 9. Vertical groove; 10. Contact point 1; 11. Contact point 2; 12. Flow sensor; 13. Electric push rod; 14. Cleaning brush; 15. Shielding groove; 151. Electric telescopic column; 16. Baffle; 17. Linkage bracket; 18. Elastic limit head; 19. Arc head. Detailed implementation manners

[0021] The following further describes the present invention in conjunction with the drawings and specific embodiments, so that those skilled in the art can better understand the present invention and be able to implement it, but the embodiments cited do not limit the present invention.

[0022] Referring to Figures 1 to 4 As shown, a multi-pipeline check valve for oil transportation according to an embodiment of the present invention includes a valve body 1. A delivery pipeline 2 is provided inside the valve body 1. An upper valve seat 3 is installed above the valve body 1. A valve core 301 is slidably arranged inside the upper valve seat 3. The valve core 301 can move up and down inside the upper valve seat 3 and open and close the delivery pipeline 2. A limit spring 4 is installed on the upper end surface of the valve core 301. A valve cover 5 is installed inside the upper valve seat 3. The top end of the limit spring 4 contacts the inner wall of the valve cover 5; During operation, when the check valve of the present invention is in normal use, the valve body 1 is installed at an appropriate position on the oil pipeline. Then, the transported oil enters the inside of the conveying pipeline 2 from one end of the valve body 1, and the pressure of the transported oil itself acts on the lower end surface of the valve core 301. When the flow rate of the transported oil is greater than the pressure of the limiting spring 4, the valve core 301 moves upward and compresses the limiting spring 4. At this time, the valve body 1 is in an open state, and then the transported oil is transported out from the other end of the valve body 1. When the flow rate of the oil transportation decreases or stops, the valve core 301 will fall back onto the valve seat inside the valve body 1 under the action of the limiting spring 4 and its own gravity. At this time, the valve body 1 is in a closed state, that is, it can prevent the reverse flow of oil, thus facilitating the transportation of oil. The valve core 301 can move up and down inside the upper valve seat 3 and seal the valve seat inside the valve body 1, which can ensure that the airtightness of the entire valve body 1 is relatively good, solving the problem that the valve core 301 and the valve seat in the prior art cannot be completely sealed. Under the condition of multi-pipeline parallel operation, the failure of single-path sealing will destroy the pressure balance, resulting in overloading of other pipelines and accelerating the wear of the sealing surface.

[0023] A matching plate 6 is installed at the bottom of the upper valve seat 3. A matching groove 601 is formed on the surface of the matching plate 6. A matching ring 7 is installed on the lower end surface of the valve core 301. The shape of the matching ring 7 is adapted to the shape of the matching groove 601. During operation, when the flow rate of the oil transportation decreases or stops, and the valve core 301 moves under the action of the limiting spring 4 and its own gravity, the valve core 301 will drive the matching ring 7 to move downward. Then, the matching ring 7 will fall into the matching groove 601. Under the mutual cooperation of the matching ring 7 and the matching groove 601, it can further prevent the reverse flow of oil when the valve body 1 is closed.

[0024] Refer to Figures 2 to 5 As shown in the figure, a sliding rod 8 is slidably arranged inside the valve cover 5. A vertical groove 9 is formed on the inner wall of the valve cover 5. The sliding rod 8 is slidably arranged inside the vertical groove 9. A contact point one 10 is installed at the bottom of the sliding rod 8. A contact point two 11 is installed on the groove wall of the vertical groove 9. The contact point one 10 and the contact point two 11 are designed on the same vertical line. A timing sensor 501 is installed inside the valve cover 5. When the valve body 1 is in the closed state, the contact 10 and the contact 2 11 are in contact state, and the matching ring 7 is located inside the matching groove 601, that is, the valve core 301 can completely close the delivery pipeline 2 inside the valve body 1, so that the oil will not flow back, and it is marked as a normal state; when the valve body 1 is used for the first time, that is, when the valve core 301 is pressurized, the valve core 301 compresses the limit spring 4 and drives the slide bar 8 to move upward, so that the slide bar 8 drives the contact 10 away from the contact 2 11, and when the oil is delivered, the valve core 301 compresses the limit spring 4 and drives the slide bar 8 to move upward, so that the slide bar 8 drives the contact 10 away from the contact 2 11. When the flow rate is reduced or stopped, the timing sensor 501 marks the stop time of the oil delivery, and when the valve core 301 recovers under the elastic force of the limit spring 4, that is, drives the contact 10 to gradually move to the normal state described above, when the contact 10 contacts the contact 2 11 again, the timing sensor 501 marks the time point when the contact 10 contacts the contact 2 11 again, and the difference between the current time point and the stop time point is calculated to obtain the normal recovery time of the valve core 301; If, in subsequent use, the timing sensor 501 receives the oil delivery stop signal, and the valve core 301 does not return to the normal state position within the normal recovery time, and the timing sensor 501 transmits a signal to the controller, the controller will issue an alarm; This can avoid the following problems: when the oil reverse flow path is not tightly closed, the high-pressure oil flow will impact the pump body in the opposite direction, which may cause damage to the impeller in the pipeline; and under the condition of multiple pipelines in parallel, the failure of a single-line seal will destroy the pressure balance, causing other pipelines to operate under overload and accelerate the wear of the sealing surface.

[0025] A flow sensor 12 is installed on the outside of the valve body 1. The flow sensor 12 is used to monitor the oil delivery flow rate in the valve body 1. The shape of the slide bar 8 is adapted to the shape of the vertical groove 9. When working, a flow sensor 12 is designed inside the valve body 1. The flow sensor 12 can monitor the oil inside the valve body 1 in real time. When the oil delivery inside the valve body 1 stops, the flow sensor 12 will transmit a signal to the timing sensor 501. Then the timing sensor 501 can time the recovery time of the valve core 301, so that the valve core 301 can block the valve body 1. Reference Figures 2 to 6 As shown, an electric push rod 13 is installed inside the upper valve seat 3 near the top, the valve cover 5 is slidably arranged inside the upper valve seat 3, the telescopic end of the electric push rod 13 contacts the end surface of the valve cover 5, and a groove matching the valve cover 5 is arranged inside the upper valve seat 3; During operation, when the oil transportation inside the valve body 1 stops and the timing sensor 501 does not return to the normal state position within the normal recovery time, the timing sensor 501 will transmit a signal to the controller, and the controller will control the electric push rod 13 to move. The telescopic end of the electric push rod 13 will push the valve cover 5 downward, causing the valve cover 5 to drive the limit spring 4 and the valve core 301 to move downward. The valve core 301 will quickly combine with the valve seat inside the valve body 1, so as to avoid the problem that when the reverse flow path of the oil is not tightly closed, the high-pressure oil flow will impact the pump body in the reverse direction, which may cause damage to the impeller in the pipeline.

[0026] A cleaning brush 14 is arranged on the inner wall of the upper valve seat 3. The cleaning brush 14 can move on the inner wall of the upper valve seat 3 and clean the impurities and oil existing on the surface of the limit spring 4. During operation, when the oil transportation inside the valve body 1 stops and the valve core 301 moves downward and returns to the normal state, through the action of the cleaning brush 14 inside the upper valve seat 3, the cleaning brush 14 can clean the limit spring 4, avoiding the problem that too many impurities on the surface of the limit spring 4 affect the valve core 301 from returning to the normal state, and also avoiding the problem that some impurities accumulate on the surface of the limit spring 4 for a long time and affect the upward movement of the valve core 301.

[0027] Refer to Figures 3 to 10 As shown, a shielding groove 15 is formed on the inner wall of the upper valve seat 3. The shape of the shielding groove 15 is adapted to the shape of the cleaning brush 14. A baffle 16 is slidably arranged on the groove wall of the shielding groove 15. An electric telescopic column 151 is installed on the inner wall of the shielding groove 15, and the telescopic end of the electric telescopic column 151 is connected to the side wall of the cleaning brush 14. During operation, when the valve core 301 presses the limit spring 4, that is, when the valve body 1 is in the open state, the baffle 16 is located outside the shielding groove 15 and seals the entire shielding groove 15. When the valve body 1 changes from the open state to the closed state, by controlling the baffle 16 to move upward, the baffle 16 no longer seals the shielding groove 15. Subsequently, control the electric telescopic column 151 to move, so that the electric telescopic column 151 drives the cleaning brush 14 to move. The cleaning brush 14 moves to one side of the limit spring 4 and contacts the limit spring 4, thus facilitating the subsequent cleaning of the surface of the limit spring 4.

[0028] A linkage bracket 17 is mounted on the side wall of the sliding rod 8. One side of the linkage bracket 17 away from the sliding rod 8 is connected to the side wall of the baffle 16. A vertical groove adapted to the baffle 16 is provided in the inner wall of the upper valve seat 3. During operation, when the sliding rod 8 moves upward under the pressure of the limit spring 4, the sliding rod 8 will drive the baffle 16 to move upward through the linkage bracket 17, and the baffle 16 will block the shielding groove 15. When the sliding rod 8 moves downward, the sliding rod 8 will drive the baffle 16 to move downward through the linkage bracket 17, that is, the baffle 16 no longer blocks the shielding groove 15. Subsequently, under the movement of the electric telescopic column 151, the cleaning brush 14 can be driven to move and clean. In this way, when there is oil transportation inside the conveying pipeline 2, the baffle 16 is in a blocking state, which facilitates the subsequent use of the cleaning brush 14.

[0029] Refer to Figures 5 to 9 As shown, the telescopic end of the electric telescopic column 151 is of telescopic design, and a spring is sleeved on its outer peripheral surface. An elastic limit head 18 is fixedly installed on the outer peripheral surface of the telescopic end of the electric telescopic column 151. An arc head 19 is installed on the groove wall of the shielding groove 15. The shapes of the elastic limit head 18 and the arc head 19 are both arc-shaped. During operation, when the telescopic end of the electric telescopic column 151 drives the cleaning brush 14 to move, the elastic limit head 18 at the telescopic end of the electric telescopic column 151 will contact the arc head 19, and the arc head 19 will squeeze and limit the elastic limit head 18. As the telescopic end of the electric telescopic column 151 continues to move, that is, when the elastic limit head 18 crosses the limit of the arc head 19, due to the telescopic design of the telescopic end of the electric telescopic column 151 and the spring sleeved on its outer peripheral surface, the cleaning brush 14 will impact the surface of the limit spring 4 with a greater force, causing the large impurities existing on the surface of the limit spring 4 to fall off, and during the subsequent oil transportation process, they will be transported away together. In this way, it is convenient for the limit spring 4 to drive the normal opening of the valve core 301.

[0030] Working principle: When the check valve of the present invention is used normally, the valve body 1 is installed at an appropriate position on the oil transportation pipeline. Then, the transported oil will enter the inside of the conveying pipeline 2 from one end of the valve body 1, and the pressure of the transported oil itself will act on the lower end surface of the valve core 301. When the flow rate of the transported oil is greater than the pressure of the limit spring 4, the valve core 301 will move upward and compress the limit spring 4. At this time, the valve body 1 is in an open state. Then, the transported oil will be transported out from the other end of the valve body 1. When the flow rate of the oil decreases or stops, the valve core 301 will fall back onto the valve seat inside the valve body 1 under the action of the limit spring 4 and its own gravity. At this time, the valve body 1 is in a closed state, that is, it can prevent the reverse flow of oil, thus facilitating the transportation of oil. When the oil delivery flow rate decreases or stops, and the valve core 301 moves under the limit spring 4 and its own gravity, the valve core 301 will drive the mating ring 7 to move downward. After that, the mating ring 7 will fall into the mating groove 601. Under the mutual cooperation of the mating ring 7 and the mating groove 601, it can further prevent the oil from flowing back when the valve body 1 is closed; When the valve body 1 is in the closed state, the first contact 10 and the second contact 11 are in contact. At this time, the mating ring 7 is located inside the mating groove 601, that is, at this time, it means that the valve core 301 can completely seal the conveying pipeline 2 inside the valve body 1, so that the oil will not flow back. At this time, it is marked as the normal state; when the valve body 1 is used for the first time, that is, when the valve core 301 is pressed, the valve core 301 compresses the limit spring 4 and drives the slide bar 8 to move upward, so that the slide bar 8 drives the first contact 10 away from the second contact 11. When the oil delivery flow rate decreases or stops, at this time, the timing sensor 501 marks the stop time of the oil delivery. And when the valve core 301 returns under the elastic force of the limit spring 4, that is, when it drives the first contact 10 to gradually move to the above-mentioned normal state, when the first contact 10 contacts the second contact 11 again, at this time, the timing sensor 501 marks the time point when the first contact 10 contacts the second contact 11 again, and calculates the difference between the current time point and the stop time point to obtain the normal recovery time of the valve core 301; If in subsequent use, when the timing sensor 501 receives the oil delivery stop signal, and the valve core 301 does not return to the normal state position within the normal recovery time, and the timing sensor 501 will transmit the signal to the controller, and the controller will issue an alarm; when the oil delivery inside the valve body 1 stops, and the timing sensor 501 does not return to the normal state position within the normal recovery time, the timing sensor 501 will transmit the signal to the controller, and the controller will control the electric push rod 13 to move. The telescopic end of the electric push rod 13 will push the valve cover 5 downward, so that the valve cover 5 drives the limit spring 4 and the valve core 301 to move downward, and the valve core 301 will be combined with the valve seat inside the valve body 1 as soon as possible, so as to avoid the problem that when the oil reverse flow path is not tightly closed, the high-pressure oil flow will impact the pump body in the reverse direction, which may cause damage to the impeller in the pipeline; When the oil transportation inside the valve body 1 stops and the valve core 301 moves downward to return to the normal state, through the action of the cleaning brush 14 inside the upper valve seat 3, the cleaning brush 14 can clean the limiting spring 4, avoiding the problem that excessive impurities on the surface of the limiting spring 4 affect the return of the valve core 301 to the normal state, and also avoiding the problem that some impurities accumulate on the surface of the limiting spring 4 for a long time, affecting the upward movement of the valve core 301; when the valve core 301 presses the limiting spring 4, that is, when the valve body 1 is in the open state, the baffle 16 is located outside the blocking groove 15 and blocks the entire blocking groove 15; when the valve body 1 changes from the open state to the closed state, by controlling the upward movement of the baffle 16, the baffle 16 no longer blocks the blocking groove 15, and then controlling the movement of the electric telescopic column 151, the electric telescopic column 151 drives the cleaning brush 14 to move, and the cleaning brush 14 moves to one side of the limiting spring 4 and contacts the limiting spring 4, thus facilitating the subsequent cleaning of the surface of the limiting spring 4; When the sliding rod 8 moves upward under the pressure of the limiting spring 4, the sliding rod 8 drives the baffle 16 to move upward through the linkage bracket 17, and the baffle 16 blocks the blocking groove 15; when the sliding rod 8 moves downward, the sliding rod 8 drives the baffle 16 to move downward through the linkage bracket 17, that is, the baffle 16 no longer blocks the blocking groove 15, and then under the movement of the above-mentioned electric telescopic column 151, the cleaning brush 14 can be driven to move and clean; in this way, when there is oil transportation inside the conveying pipeline 2, the baffle 16 is in the blocking state, which is convenient for the subsequent use of the cleaning brush 14.

[0031] Obviously, the above embodiments are only examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A multi-pipeline check valve for oil transportation, characterized in that: It includes a valve body. A conveying pipeline is provided inside the valve body. An upper valve seat is installed above the valve body. A valve core is slidably arranged inside the upper valve seat. The valve core can move up and down inside the upper valve seat and open and close the conveying pipeline. A limiting spring is installed on the upper end surface of the valve core. A valve cover is installed inside the upper valve seat. The top end of the limiting spring contacts the inner wall of the valve cover.

2. The multi-pipeline check valve for oil transportation according to claim 1, characterized in that: A mating plate is installed at the bottom of the upper valve seat. A mating groove is formed on the surface of the mating plate. A mating ring is installed on the lower end surface of the valve core. The shape of the mating ring is adapted to the shape of the mating groove.

3. The multi-pipeline check valve for oil transportation according to claim 2, characterized in that: A slide bar is slidably arranged inside the valve cover. A vertical groove is formed on the inner wall of the valve cover. The slide bar is slidably arranged inside the vertical groove. A contact point one is installed at the bottom of the slide bar. A contact point two is installed on the groove wall of the vertical groove. The contact point one and the contact point two are designed on the same vertical line. A timing sensor is installed inside the valve cover.

4. The multi-pipeline check valve for oil transportation according to claim 3, characterized in that: A flow sensor is installed on the outer side of the valve body. The flow sensor is used to monitor the oil conveying flow rate in the valve body. The shape of the slide bar is adapted to the shape of the vertical groove.

5. The multi-pipeline check valve for oil transportation according to claim 3, characterized in that: An electric push rod is installed near the top inside the upper valve seat. The valve cover is slidably arranged inside the upper valve seat. The telescopic end of the electric push rod contacts the end face of the valve cover. A groove adapted to the valve cover is provided inside the upper valve seat.

6. The multi-pipeline check valve for oil transportation according to claim 5, wherein: A cleaning brush is arranged on the inner wall of the upper valve seat. The cleaning brush can move on the inner wall of the upper valve seat and clean the impurities and oil on the surface of the limiting spring.

7. The multi-pipeline check valve for oil transportation according to claim 6, characterized in that: A shielding groove is formed on the inner wall of the upper valve seat. The shape of the shielding groove is adapted to the shape of the cleaning brush. A baffle is slidably arranged on the groove wall of the shielding groove. An electric telescopic column is installed on the inner wall of the shielding groove. The telescopic end of the electric telescopic column is connected to the side wall of the cleaning brush.

8. The multi-pipeline check valve for oil transportation according to claim 7, wherein: A linkage bracket is installed on the side wall of the slide bar. The side of the linkage bracket away from the slide bar is connected to the side wall of the baffle. A vertical groove adapted to the baffle is formed on the inner wall of the upper valve seat.

9. The multi-pipeline check valve for oil transportation according to claim 7, wherein: The telescopic end of the electric telescopic column is designed to be telescopic, and a spring is sleeved on its outer peripheral surface. An elastic limiting head is fixedly installed on the outer peripheral surface of the telescopic end of the electric telescopic column. An arc-shaped head is installed on the groove wall of the shielding groove.

10. The multi-pipeline check valve for oil transportation according to claim 9, characterized in that: The shapes of both the elastic limiting head and the arc-shaped head are arc-shaped.

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