CN112879633B - A mechanical pilot-operated safety Y-type water hammer pressure relief valve directly driven by a vane motor - Google Patents

Abstract

The invention relates to the technical field of water hammer relief valves, in particular to a mechanical pilot type safe Y-shaped water hammer relief valve directly driven by a vane motor, which comprises a hand wheel, the vane motor, a valve cover, a mechanical pilot valve, a special-shaped external thread plug and a Y-shaped main valve body, wherein the hand wheel is connected with the vane motor through a bolt; one end of the special-shaped external thread plug sequentially penetrates through the blade motor and the valve cover from top to bottom, extends into the Y-shaped main valve body and is in sealing fit with the Y-shaped main valve body, the special-shaped external thread plug is rotatably connected with the valve cover, and the blade motor is used for driving the special-shaped external thread plug to rotate; the inlet of the Y-shaped main valve body is connected to the oil inlet of the mechanical pilot valve through a first stop valve, and the oil outlet of the mechanical pilot valve is connected to the oil outlet of the Y-shaped main valve body; two oil ports of the vane motor are respectively connected to two working ports of the mechanical pilot valve through pipelines. The invention provides a mechanical pilot type safe Y-shaped water hammer relief valve directly driven by a vane motor, which solves the problem that the conventional Y-shaped water hammer relief valve cannot automatically relieve pressure.

Description

A mechanical pilot-operated safety Y-type water hammer pressure relief valve directly driven by a vane motor

technical field

The invention relates to the technical field of water hammer pressure relief valves, in particular to a mechanical pilot safety Y-type water hammer pressure relief valve directly driven by a vane motor.

Background technique

In long-distance oil pipelines, unexpected shutdown of pumps or abnormal opening and closing of valves will 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 quickly open and release the high-pressure medium, so that the pipeline pressure returns to the normal range, so as to achieve the purpose of protecting the pipeline and the equipment in the pipeline. Therefore, the opening speed of the pressure relief valve in the event of water hammer is of great significance to the safe operation of the entire pipeline.

At present, traditional water hammer pressure relief valves mainly include three structural forms: angle type, axial flow type and Y type. The principle is to ensure the normal action of the main valve through the pressure change in the main valve cavity and the main valve spring. It generally has the following defects:

1. The valve cavity of the main valve is connected with the front and rear pipelines through the pilot valve, and the liquid in the main valve cavity needs to be discharged during operation. Due to the limitation of the structure of the pilot valve and the diameter of the pressure pipe, the discharge speed of the liquid in the main valve cavity is relatively slow, making the main valve Cannot be opened quickly.

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 oil product pipelines, which limits its application scenarios.

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 the service life.

Contents of the invention

The invention proposes a mechanical pilot safety Y-type water hammer pressure relief valve directly driven by a vane motor to solve the problem that the existing Y-type water hammer pressure relief valve cannot automatically relieve pressure.

The technical solution of the present invention to solve the above problems is: a mechanical pilot safety Y-type water hammer pressure relief valve directly driven by a vane motor, including a handwheel, a vane motor, a valve cover, a mechanical pilot valve and a Y-type main valve body;

The bottom of the hand wheel is provided with a special-shaped external thread plug, and one end of the special-shaped external thread plug passes through the vane motor and the valve cover from top to bottom and extends to the Y-shaped main valve body and connects with the Y-shaped main valve body. The main valve body is sealed and matched, the special-shaped external thread plug is rotatably connected with the valve cover, and the vane motor is used to drive the special-shaped external thread plug to rotate;

The angle between the special-shaped external thread plug and the oil inlet axis of the Y-shaped main valve body is greater than 90 degrees;

The inlet of the Y-type main valve body is connected to the oil inlet of the mechanical pilot valve through the first cut-off valve, and the oil outlet of the mechanical pilot valve is connected to the oil outlet of the Y-type main valve body; the two oil ports of the vane motor are respectively passed through The pipeline is connected to the two working ports of the mechanical pilot valve, and a second shut-off valve is installed between the two pipelines.

Preferably, the vane motor includes an upper cavity and a lower cavity; the vane motor includes an upper cavity and a lower cavity; both the upper cavity and the lower cavity are provided with oil ports, and the two oil ports The ports are arranged symmetrically with respect to the axis of the vane motor;

The accommodating cavity formed by the lower cavity and the upper cavity is provided with an upper oil distribution plate, a stator ring and a lower oil distribution plate in sequence, and a rotor is arranged inside the stator ring, and the outer wall of the rotor is evenly distributed with multiple leaves.

Preferably, the rotor is sleeved on the outer wall of the special-shaped external thread plug and connected to the special-shaped external thread plug through a spline.

Preferably, the valve cover includes a sealing end cap and a support cylinder, both ends of the support cylinder are provided with threads, one end of the support cylinder is connected to the special-shaped external thread plug through an internal thread, and the other end is connected to the special-shaped external thread plug through a The external thread is connected with the sealing end cap.

Preferably, a first sealing ring is installed between the outer wall of the special-shaped external thread plug and the inner wall of the support cylinder; the support cylinder and the Y-type main valve body are connected by threads, and the support cylinder and the Y-type main valve body A second sealing ring is installed at the internal thread engagement of the body.

Preferably, the hand wheel is connected to the special-shaped external thread plug through a nut and a washer.

Preferably, the lower oil distribution plate is sealed by a sealing ring at the contact with the lower cavity.

Preferably, the upper cavity is connected with the lower cavity by bolts and sealed by a sealing ring.

Compared with the prior art, the beneficial effects of the present invention are:

1) The present invention can achieve the purpose of automatic pressure relief through the mechanical pilot valve, and when the valve body fails, the oil circuit can also be protected by manually operating the shut-off valve.

2) The present invention has low requirements on the liquid medium and allows a certain amount of impurities in the liquid medium, thus broadening the application scenarios of the water hammer pressure relief valve.

3) The present invention is equipped with a manual operation device of the water hammer pressure relief valve, and when the mechanical pilot valve fails, the normal operation of the water hammer pressure relief valve can be guaranteed through manual operation.

4) Since the mechanical pilot valve is not connected to the main valve body, but directly connected to the oil inlet and outlet pipes, it is not necessary to discharge the liquid in the main valve chamber during operation, and it is not limited by the structure of the mechanical pilot valve and the diameter of the pressure pipe during operation. The liquid in the main valve body cavity is discharged quickly, which can make the main valve body open quickly.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is a schematic diagram of the structure of the vane motor.

Fig. 3 is a schematic diagram of opening of the main valve spool.

In the figure: 1. Y-type main valve body, 2. Vane motor, 21. Lower cavity, 22. Lower oil distribution plate, 23. Stator ring, 24. Rotor, 25. Blades, 26. Upper oil distribution plate, 27 , upper cavity, 3, hand wheel, 4, gasket, 5, nut, 6, sealing end cover, 7, first sealing ring, 8, support cylinder, 9, second sealing ring, 10, special-shaped external thread plug Head, 11, the second shut-off valve, 12, the mechanical pilot valve, 13, the first shut-off valve.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments It is some embodiments of the present invention, but not all of them. Based on the implementation manners in the present invention, all other implementation manners obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention. Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention.

Embodiment 1: A mechanical pilot-operated safety Y-type water hammer pressure relief valve directly driven by a vane motor, referring to Figure 1, including a hand wheel 3, a vane motor 2, a sealing end cover 6, and a support cylinder arranged in sequence from top to bottom 8 and Y-type main valve body 1.

The bottom of the hand wheel 3 is provided with a special-shaped external thread plug 10, and one end of the special-shaped external thread plug 10 passes through the vane motor 2, the sealing end cover 6, the support cylinder 8 and extends into the Y-shaped main valve body 1 from top to bottom. And with the Y-shaped main valve body 1 seal fit, the special-shaped external thread plug 10 is rotationally connected with the valve cover, and the vane motor 2 is used to drive the special-shaped external thread plug 10 to rotate. A second sealing ring 9 is installed between the support cylinder 8 and the Y-shaped main valve body 1. Both ends of the support cylinder 8 are provided with threads, and the internal thread part at one end of the support cylinder 8 is engaged with a special-shaped external thread plug 10. The outer wall of the external thread plug 10 and the inside of the support cylinder 8 are equipped with a first sealing ring 7, the first sealing ring 7 and the upper end of the special-shaped external thread plug 10 are equipped with a sealing end cap 6; the upper end of the special-shaped external thread plug 10 is installed There is a handwheel 3, and the handwheel 3 is connected with the special-shaped external thread plug 10 through bolts 5 and gaskets 4.

The included angle between the special-shaped external thread plug 10 and the oil inlet axis of the Y-shaped main valve body 1 is greater than 90 degrees, which can reduce the impact force of water hammer on the valve body and valve stem.

The inlet of the Y-type main valve body 1 is connected to the oil inlet of the mechanical pilot valve 12 through the first cut-off valve 13, and the oil outlet of the mechanical pilot valve 12 is connected to the oil outlet of the Y-type main valve body 1; the vane motor 2 The two oil ports are respectively connected to the two working ports of the mechanical pilot valve 2 through pipelines, and a second shut-off valve 11 is installed between the two pipelines.

With reference to Fig. 2, vane motor 2 comprises upper cavity 27 and lower cavity 21; Vane motor 2 comprises upper cavity 27 and lower cavity 21; Upper cavity 27 and lower cavity 21 all offer oil port, two oil The port is arranged symmetrically with respect to the axis of the vane motor 2; the lower cavity 21 and the upper cavity 27 form the housing cavity, and the upper oil distribution plate 26, the stator ring 23 and the lower oil distribution plate 22 are arranged in sequence from top to bottom, and the stator ring A rotor 24 is arranged inside the rotor 23 , and a plurality of blades 25 are evenly distributed on the outer wall of the rotor 24 .

The rotor 24 is sleeved on the outer wall of the special-shaped external thread plug 10 and connected with the special-shaped external thread plug 10 through a spline; the lower oil distribution plate 22 is sealed by a sealing ring at the contact with the lower cavity 21; the upper cavity 27 is in contact with the lower cavity 21. The lower cavity 21 is connected by bolts and sealed by a sealing ring.

Working principle of the present invention is:

During the normal process of oil transportation in the pipeline, the water hammer pressure relief valve is in the closed state. When water hammer occurs in the pipeline, the oil at the position where the water hammer occurs is compressed due to its volume, and the oil pressure rises rapidly and moves along the Pipeline propagation. The inlet end of the Y-type main valve body 1 is connected to the main oil pipeline, and the outlet end is connected to the oil tank for receiving the oil discharged by pressure relief.

Generally, the first cut-off valve 13 is opened, and the second cut-off valve 11 is closed; the mechanical pilot valve 12 is set with a certain oil pressure threshold. When the oil pressure at the inlet of the Y-type main valve body 1 is low and does not reach the set oil pressure threshold, the mechanical pilot valve 12 works in the left position.

When the oil pressure at the entrance of the water hammer phenomenon exceeds the oil pressure threshold, the high pressure oil pressure will drive the mechanical pilot valve 12 to change from the left position to the right position, and the high pressure oil will pass through the first stop valve from the entrance of the Y-type main valve body 1 13 and then enters the mechanical pilot valve 12, flows out from the mechanical pilot valve 12 and enters the oil port of the upper cavity 27 of the vane motor 2, and then passes through the oil port of the lower cavity port 21 of the vane motor 2 and then passes through the exhaust of the mechanical pilot valve 12 The oil port returns to the outlet oil passage of the Y-type main valve body 1 to complete pressure relief. When the hydraulic oil passes through the vane motor 2, the rotor 24 of the vane motor 2 is pushed to rotate counterclockwise, and the splines on the rotor 24 drive the special-shaped external thread plug 10 to rotate counterclockwise, and make it rotate between the special-shaped external thread plug 10 and the support cylinder. 8 rises under the action of the lead screw formed between 8, so that the oil inlet of the Y-shaped main valve body 1 communicates with the oil outlet, and the oil flows from the oil inlet to the oil outlet, thereby reducing the oil pressure in the pipeline.

When the mechanical pilot valve 12 fails, the first stop valve 13 can be manually closed and the second stop valve 11 can be opened, and the special-shaped external thread plug 10 can be displaced upward in the support cylinder 8 by rotating the hand wheel 3, so that the Y-type main valve The oil inlet of the body 1 communicates with the oil outlet, and the high-pressure oil flows from the oil inlet to the oil outlet, thereby reducing the oil pressure in the pipeline.

When the pressure relief is completed, the pressure in the oil circuit is lower than the oil pressure threshold, the mechanical pilot valve 12 is in the left position, and the high-pressure oil enters the mechanical pilot valve 12 from the entrance of the Y-type main valve body 1 through the first cut-off valve 13. After the pilot valve 12 flows out, it enters the oil port of the lower cavity 21 of the vane motor 2, and then passes through the oil port of the upper cavity 27 of the vane motor 2, and then flows back to the Y-type main valve body 1 through the oil discharge port of the mechanical pilot valve 12. Oil outlet. When the hydraulic oil passes through the vane motor 2, the rotor 24 of the vane motor 2 is pushed to rotate clockwise, and the splines on the rotor 24 drive the special-shaped external thread plug 10 to rotate clockwise, and make it rotate between the special-shaped external thread plug 10 and the support cylinder. The action of the leading screw formed between 8 drops down, so that the valve in the Y-type main valve body 1 is closed to prevent the oil from flowing out.

When the mechanical pilot valve 12 fails, the first shut-off valve 13 can be manually closed and the second shut-off valve 11 can be opened, and the special-shaped external thread plug 10 can be displaced downward in the support cylinder 8 by rotating the hand wheel 3 to close the valve and stop pressure relief.

The above description is only an embodiment of the present invention, and is not intended to limit the protection scope of the present invention. Any equivalent structure or equivalent process conversion made by using the description of the present invention and the contents of the accompanying drawings, or directly or indirectly used in other related The system field is equally included in the scope of protection of the present invention.

Claims (7)

1. A mechanical pilot-operated safety Y-type water hammer pressure relief valve directly driven by a vane motor, characterized in that it includes a hand wheel (3), a vane motor (2), a valve cover, a mechanical pilot valve (12) and a Y-type main valve body (1); The bottom of the hand wheel (3) is provided with an external thread plug (10), and one end of the external thread plug (10) passes through the vane motor (2), the valve cover and extends to the Y Type main valve body (1) and sealing fit with the Y-type main valve body (1), the external threaded plug (10) is rotatably connected with the valve cover, and the vane motor (2) is used to drive The externally threaded plug (10) rotates; The angle between the external thread plug (10) and the oil inlet axis of the Y-type main valve body (1) is greater than 90 degrees; The oil inlet port of the Y-type main valve body (1) is connected to the oil inlet port of the mechanical pilot valve (12) through the first stop valve (13), and the oil outlet port of the mechanical pilot valve (12) is connected to the Y-type main valve body The oil outlet of (1); the two oil ports of the vane motor (2) are respectively connected to the two working ports of the mechanical pilot valve (1 2) through pipelines, and the second stop valve (11) is installed between the two pipelines ; The vane motor (2) includes an upper cavity (27) and a lower cavity (21); both the upper cavity (27) and the lower cavity (21) have oil ports, and the two oil ports are opposite to each other. arranged symmetrically to the axis of the vane motor (2); The lower cavity (21) and the upper cavity (27) form the accommodation cavity, and the upper oil distribution plate (26), the stator ring (23) and the lower oil distribution plate (22) are arranged in sequence, and the stator ring ( 23) is provided with a rotor (24) inside, and a plurality of vanes (25) are evenly distributed on the outer wall of the rotor (24). 2. A mechanical pilot-operated safety Y-type water hammer pressure relief valve directly driven by a vane motor according to claim 1, characterized in that: the rotor (24) is sleeved on the outer wall of the external threaded plug (10) and Connect with the external thread plug (10) through splines. 3. A mechanical pilot-operated safety Y-type water hammer pressure relief valve directly driven by a vane motor according to claim 2, characterized in that: the valve cover includes a sealing end cover (6) and a support cylinder (8), Both ends of the support cylinder (8) are threaded, one end of the support cylinder (8) is connected to the external thread plug (10) through an internal thread, and the other end is connected to the sealing end cap (6) through an external thread )connect. 4. A mechanical pilot-operated safety Y-type water hammer pressure relief valve directly driven by a vane motor according to claim 3, characterized in that: the outer wall of the external threaded plug (10) and the support cylinder (8) A first sealing ring (7) is installed between the inner walls; the support cylinder (8) is threaded to the Y-type main valve body (1), and the support cylinder (8) is connected to the Y-type main valve body (1) A second sealing ring (9) is installed at the engaging place of the internal thread. 5. A mechanical pilot-operated safety Y-type water hammer pressure relief valve directly driven by a vane motor according to claim 4, characterized in that: the hand wheel (3) passes through a nut (5) and a washer (4) Connect with the external thread plug (10). 6. A mechanical pilot-operated safety Y-type water hammer pressure relief valve directly driven by a vane motor according to claim 5, characterized in that: the contact between the lower oil distribution plate (22) and the lower cavity (21) Sealed with a sealing ring. 7. A mechanical pilot-operated safety Y-type water hammer pressure relief valve directly driven by a vane motor according to claim 6, characterized in that: the upper cavity (27) and the lower cavity (21) are connected by bolts And sealed by the sealing ring.

Images