Gear motor direct drive mechanical pilot Y-type water hammer pressure relief valve

Abstract

The present application discloses a gear motor direct-driven mechanical pilot Y-type water hammer pressure relief valve, which relates to the technical field of water hammer pressure relief valves. It can quickly realize automatic pressure relief through the action of a mechanical valve, and when the valve body fails, it can also ensure the normal operation of the pressure relief valve by manual operation. The Y-type water hammer pressure relief valve includes a Y-type water hammer pressure relief valve main valve and a mechanical pilot valve; the main valve includes a valve body, a special-shaped external threaded valve stem and a valve cover, a valve disc is provided on the first end of the special-shaped external threaded valve stem, the valve disc extends into the valve body and cooperates with the valve body seal, and the second end of the special-shaped external threaded valve stem is connected to the gear motor and the handwheel in turn; the angle between the inlet of the valve body and the special-shaped external threaded valve stem is greater than 90°, and the main valve and the gear motor are connected through a mechanical pilot valve; the oil circuit between the inlet of the valve body and the oil inlet of the mechanical pilot valve is provided with a first stop valve, and the oil circuit between the two oil ports of the gear motor is provided with a second stop valve. The present application is used to improve the performance of the Y-type water hammer pressure relief valve.

Description

Technical Field

[0001] The present application relates to the technical field of water hammer pressure relief valves, and in particular to a gear motor direct-driven mechanical pilot Y-type water hammer pressure relief valve. Background Art

[0002] In long-distance oil pipelines, unexpected pump stoppage or abnormal valve opening and closing can cause water hammer, which may cause local overpressure in the pipeline and cause pipe burst accidents. In order to ensure the safe operation of long-distance oil pipelines and related equipment, water hammer pressure relief valves are usually used to release water hammer pressure. When water hammer occurs in the pipeline, the pressure relief valve can open quickly and release the high-pressure medium to restore the pipeline pressure to the normal range, thereby protecting the pipeline and the equipment in the pipeline. Therefore, the opening speed of the pressure relief valve when water hammer occurs is of great significance to the safe operation of the entire pipeline.

[0003] At present, traditional water hammer pressure relief valves mainly include three structural forms: angle type, axial flow type and Y type. The principle of the water hammer pressure relief valves of the above structures is to ensure the normal operation of the main valve through the pressure change in the main valve cavity and the main valve spring. They generally have the following defects:

[0004] 1. The main valve cavity is connected to the front and rear pipelines through the pilot valve. When the main valve cavity is actuated, the liquid in the main valve cavity needs to be discharged. Due to the limitations of the pilot valve structure and the diameter of the pressure-inducing pipe, the liquid discharge speed in the main valve cavity is slow, so that the main valve cannot be opened quickly;

[0005] 2. The oil needs to flow through the main valve cavity, so the requirements for the liquid medium are high, and a filter needs to be installed, so that the traditional water hammer pressure relief valve can only be used for long-distance pipelines of refined oil, limiting its application scenarios;

[0006] 3. Due to the existence of the main valve spring, the valve core will vibrate during operation, which will aggravate the wear of the valve core and shorten its service life. Summary of the invention

[0007] An embodiment of the present application provides a gear motor direct-driven mechanical pilot Y-type water hammer pressure relief valve, which can quickly achieve automatic pressure relief through the action of a mechanical valve, and when the valve body fails, the normal operation of the pressure relief valve can also be ensured by manual operation.

[0008] To achieve the above-mentioned purpose, an embodiment of the present application provides a gear motor direct-driven mechanical pilot Y-type water hammer pressure relief valve, comprising a Y-type water hammer pressure relief valve main valve and a mechanical pilot valve; the Y-type water hammer pressure relief valve main valve comprises a valve body, a special-shaped external threaded valve stem and a valve cover, the valve body is sealed and connected to the valve cover, the middle part of the special-shaped external threaded valve stem is threadedly connected to the valve cover, a valve disc is provided on the first end of the special-shaped external threaded valve stem, the valve disc extends into the valve body and seals with the valve body, and the second end of the special-shaped external threaded valve stem is connected to a gear motor and a hand wheel in sequence; the special-shaped external threaded valve stem and the valve cover are sealed by a valve stem packing; the angle between the inlet of the valve body and the special-shaped external threaded valve stem is greater than 90°; the Y-type water hammer pressure relief valve main valve is connected to the gear motor through the mechanical pilot valve; a first stop valve is provided in the oil circuit between the inlet of the valve body and the oil inlet of the mechanical pilot valve, and a second stop valve is provided in the oil circuit between the two oil ports of the gear motor.

[0009] Furthermore, the gear motor is spline-connected to the special-shaped externally threaded valve stem.

[0010] Furthermore, the gear motor includes a housing and a first gear and a second gear arranged in the housing; the first gear and the second gear are meshed with each other, and the first gear is located on the outside of the second gear, and two oil ports are provided on the housing, the two oil ports are symmetrically arranged relative to the axis of the gear motor, and the two oil ports are respectively located on both sides of the line connecting the center of the first gear and the center of the second gear.

[0011] Furthermore, the first gear is provided with an internal spline, the special-shaped externally threaded valve stem is provided with an external spline, and the second end of the special-shaped externally threaded valve stem passes through the internal spline and is connected to the hand wheel.

[0012] Furthermore, the valve body and the valve cover are connected via threads and sealed by a sealing ring.

[0013] Furthermore, a cavity is provided in the valve cover, a packing cavity is formed between the inner wall of the cavity and the special-shaped external threaded valve stem, and a gland nut is provided on the valve cover, and the gland nut can press the packing in the packing cavity.

[0014] Furthermore, a mounting hole is provided on the hand wheel, and an external thread is provided on the second end of the special-shaped externally threaded valve stem. The second end of the special-shaped externally threaded valve stem passes through the mounting hole and is fastened to a nut.

[0015] Furthermore, it also includes a packing gland; a packing cavity is formed between the valve cover and the special-shaped external thread valve stem, the packing gland and the valve stem packing are both arranged in the packing cavity, and the valve stem packing is compressed between the packing gland and the bottom surface of the packing cavity

[0016] Compared with the prior art, this application has the following beneficial effects:

[0017] 1. In the embodiment of the present application, the gear motor is used to directly drive the movement of the special-shaped external threaded valve stem of the Y-type water hammer pressure relief valve main valve to realize the opening and closing of the main valve. Compared with the prior art in which the discharge speed of the liquid in the main valve cavity is limited by the diameters of the pilot valve and the pressure-leading pipe, when the Y-type water hammer pressure relief valve main valve is closed in the embodiment of the present application, the liquid in the Y-type water hammer pressure relief valve main valve cavity can be directly discharged into the pipeline. When water hammer occurs in the pipeline, the Y-type water hammer pressure relief valve main valve can be opened quickly, which can effectively avoid pipe burst accidents.

[0018] 2. The embodiment of the present application adopts a mechanical pilot valve, which has rapid and reliable switching, and the main valve operates quickly and can release pressure in time.

[0019] 3. The embodiments of the present application do not have high requirements on the liquid medium and allow a certain amount of impurities in the liquid medium, thereby broadening the application scenarios of the water hammer pressure relief valve.

[0020] 4. The embodiment of the present application directly drives the movement of the special-shaped external threaded valve stem of the main valve of the Y-type water hammer pressure relief valve through a gear motor. Compared with the prior art that realizes the movement of the valve core by compressing the spring in the main valve, the embodiment of the present application will not cause valve core flutter during operation, and the valve core life is longer.

[0021] 5. A handwheel is installed on the special-shaped externally threaded valve stem in the embodiment of the present application. When the mechanical pilot valve fails to work, the switch of the main valve can be controlled by the handwheel, which can effectively avoid pipe bursting due to excessive oil pressure in the pipeline caused by the failure of the mechanical pilot valve.

[0022] 6. In the embodiment of the present application, the special-shaped externally threaded valve stem and the valve body of the Y-type water hammer pressure relief valve main valve are installed at a certain angle, which can reduce the impact force of water hammer on the valve body and the special-shaped externally threaded valve stem. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 This is a schematic structural diagram of a Y-type water hammer pressure relief valve in a main valve closed state according to an embodiment of the present application;

[0025] Figure 2 This is a schematic diagram of the structure of the main valve of the Y-type water hammer pressure relief valve in the embodiment of the present application in the open state;

[0026] Figure 3 2 is a cross-sectional view of the gear motor in the embodiment of the present application. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0028] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0029] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0030] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0031] Reference Figure 1 and Figure 2The embodiment of the present application provides a gear motor direct-driven mechanical pilot Y-type water-surge pressure relief valve, which includes a Y-type water-surge pressure relief valve main valve and a mechanical pilot valve 14. The Y-type water-surge pressure relief valve main valve includes a valve body 1, a valve cover 5 is installed on the valve body 1, and an internal thread is provided on the valve cover 5. A sealing ring 4 is installed between the valve cover 5 and the valve body 1. The internal thread part of the valve cover 5 is meshed with a special-shaped external thread valve stem 3, and a valve disc 2 is provided on the first end of the special-shaped external thread valve stem 3. The valve disc 2 extends into the valve body 1 and seals with the valve body 1. The angle between the inlet of the valve body 1 and the special-shaped external thread valve stem 3 is greater than 90°. A cavity is provided in the valve cover 5, and a packing cavity is formed between the inner wall of the cavity and the special-shaped external thread valve stem 3. A packing gland 7 and a valve stem packing 6 are arranged in the packing cavity. A gland nut 8 is provided on the valve cover 5, and the gland nut 8 pushes the packing gland 7 to press the valve stem packing 6 in the packing cavity. A handwheel 10 is installed at the second end of the special-shaped external thread valve stem 3. Specifically, a mounting hole is provided on the handwheel 10, and an external thread is provided at the second end of the special-shaped external thread valve stem 3. The second end of the special-shaped external thread valve stem 3 passes through the mounting hole and is tightened with a nut 12. A washer 11 for preventing loosening is also provided between the nut 12 and the handwheel 10. A gear motor 9 is installed at the portion of the special-shaped external thread valve stem 3 between the handwheel 10 and the gland nut 8. The main valve of the Y-type water hammer relief valve is connected to the gear motor 9 through a mechanical pilot valve 14.

[0032] A first stop valve 13 is provided on the oil circuit between the inlet of the valve body 1 and the mechanical pilot valve 14 , and a second stop valve 15 is provided on the oil circuit between the two oil ports of the gear motor 9 .

[0033] Reference Figure 3 The gear motor 9 includes a housing 95 and a first gear 91 and a second gear 92 disposed in the housing 95. The first gear 91 and the second gear 92 are meshed with each other, and the first gear 91 is located outside the second gear 92. The housing 95 is provided with two oil ports, which are symmetrically arranged relative to the axis of the gear motor 9, and are respectively located on both sides of the line connecting the center of the first gear 91 and the center of the second gear 92. For ease of description, the oil port on the left is recorded as the first oil port 93, and the oil port on the right is recorded as the second oil port 94. An internal spline is provided on the first gear 91, and an external spline is provided on the special-shaped external thread valve stem 3. The second end of the special-shaped external thread valve stem 3 passes through the internal spline and is connected to the hand wheel 10.

[0034] Continue to refer to Figure 1 and Figure 2 The working principle of a gear motor direct-driven mechanical pilot Y-type water hammer pressure relief valve in the embodiment of the present application is as follows:

[0035] Reference Figure 1When the oil pressure of the oil pipeline is normal and no water hammer occurs, the first stop valve 13 is in an open state, the second stop valve 15 is in a closed state, the main valve is closed, the oil cannot flow out through the pressure relief valve, and a certain oil pressure threshold is set for the mechanical pilot valve 14. At this time, since the oil pressure at the inlet of the valve body 1 is low and does not reach the set oil pressure threshold, the mechanical pilot valve 14 is in the left position.

[0036] Reference Figures 1 to 3 When water hammer occurs, the oil pressure at the inlet of the valve body 1 increases and exceeds the set oil pressure threshold. The mechanical pilot valve 14 switches from the left position to the right position. The high-pressure oil at the inlet can flow through the first stop valve 13 and the mechanical pilot valve 14, and flow in from the second oil port 94 on the right side of the gear motor 9, pushing the first gear 91 to rotate counterclockwise, and the second gear 92 to rotate clockwise. Then the oil flows out from the first oil port 93 on the left, and the outflowing oil flows to the main valve outlet through the mechanical pilot valve 14. Since the special-shaped external threaded valve stem 3 is connected to the first gear 91 through a spline, the rotor 95 drives the special-shaped external threaded valve stem 3 to rotate counterclockwise, and the special-shaped external threaded valve stem 3 can move axially relative to the first gear 91. Therefore, the special-shaped external threaded valve stem 3 rises, the main valve opens, and the oil pressure at the inlet of the valve body 1 decreases. It should be noted that the oil pressure threshold can be set according to the actual application situation, and there is no restriction here.

[0037] Reference Figure 2 and Figure 3 After the pressure relief is completed, that is, when the oil pressure at the inlet of the valve body 1 is lower than the set oil pressure threshold, the mechanical pilot valve 14 switches to the left position, and the oil at the inlet of the valve body 1 can flow through the first stop valve 13 through the mechanical pilot valve 14, and flow in from the first oil port 93 on the left side of the gear motor 9, pushing the first gear 91 to rotate clockwise, and the second gear 92 to rotate counterclockwise, and then the oil flows out from the second oil port 94 on the right side, and the oil flowing out of the second oil port 94 flows to the main valve outlet through the mechanical pilot valve 14, and the first gear 91 drives the special-shaped external threaded valve stem 3 to rotate clockwise and descend until the main valve is closed.

[0038] When the mechanical pilot valve 14 fails to work, the first stop valve 13 is closed and the second stop valve 15 is opened. The hand wheel 10 can be manually rotated to open the special-shaped external threaded valve stem 3 to rise, so as to open the main valve body and complete the pressure relief. In this way, main pipeline accidents caused by pilot valve failure can be effectively avoided.

[0039] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A gear motor direct-driven mechanical pilot Y-type water hammer pressure relief valve, characterized in that: Including Y-type water hammer relief valve main valve and mechanical pilot valve; The Y-type water hammer pressure relief valve main valve comprises a valve body, an externally threaded valve stem and a valve cover, the valve body is sealed and connected to the valve cover, the middle part of the externally threaded valve stem is threadedly connected to the valve cover, a valve disc is arranged on the first end of the externally threaded valve stem, the valve disc extends into the valve body and seals with the valve body, the second end of the externally threaded valve stem is connected to a gear motor and a hand wheel in sequence; the externally threaded valve stem and the valve cover are sealed by a valve stem packing; the angle between the inlet of the valve body and the externally threaded valve stem is greater than 90°; The main valve of the Y-type water hammer relief valve is connected to the gear motor through the mechanical pilot valve; a first stop valve is provided in the oil circuit between the inlet of the valve body and the oil inlet of the mechanical pilot valve, and a second stop valve is provided in the oil circuit between the two oil ports of the gear motor; The gear motor is spline-connected to the externally threaded valve stem; The gear motor includes a housing and a first gear and a second gear arranged in the housing; the first gear and the second gear are meshed with each other, and the first gear is located on the outside of the second gear. Two oil ports are provided on the housing, and the two oil ports are symmetrically arranged relative to the axis of the gear motor, and the two oil ports are respectively located on both sides of the line connecting the center of the first gear and the center of the second gear.

2. The gear motor direct-driven mechanical pilot Y-type water hammer pressure relief valve according to claim 1, characterized in that: The first gear is provided with an internal spline, the external thread valve stem is provided with an external spline, and the second end of the external thread valve stem passes through the internal spline and is connected to the hand wheel.

3. The gear motor direct-driven mechanical pilot Y-type water hammer pressure relief valve according to claim 1, characterized in that: The valve body and the valve cover are connected via threads and sealed via a sealing ring.

4. The gear motor direct-driven mechanical pilot Y-type water hammer pressure relief valve according to claim 1, characterized in that: A cavity is provided in the valve cover, a packing cavity is formed between the inner wall of the cavity and the externally threaded valve stem, and a gland nut is provided on the valve cover, and the gland nut can press the valve stem packing into the packing cavity.

5. The gear motor direct-driven mechanical pilot Y-type water hammer pressure relief valve according to claim 1, characterized in that: The hand wheel is provided with a mounting hole, the second end of the externally threaded valve stem is provided with an external thread, and the second end of the externally threaded valve stem is fastened with a nut after passing through the mounting hole.

6. The gear motor direct-driven mechanical pilot Y-type water hammer pressure relief valve according to claim 1, characterized in that: It also includes a packing gland; a cavity is provided in the valve cover, a packing cavity is formed between the inner wall of the cavity and the externally threaded valve stem, the packing gland and the valve stem packing are both arranged in the packing cavity, and the valve stem packing is compressed between the packing gland and the bottom surface of the packing cavity.

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