Water diaphragm pump capable of preventing reverse flow and water hammer waves

Abstract

The invention belongs to the field of pump equipment, and particularly relates to a water diaphragm pump capable of preventing reverse flow and water hammer waves. According to the defects of an existing water diaphragm check valve, the integrated valve body device is provided, and the effect of preventing reverse flow and water hammer waves is achieved. The operation stability and the volume efficiency of the water diaphragm are greatly improved, and the economic benefit is greatly improved.

Description

Technical Field

[0001] The invention belongs to the field of pump equipment, in particular to a water diaphragm pump capable of preventing backflow and water shock waves. Background Art

[0002] The water diaphragm pump is developed on the basis of the water isolation pump (also known as the ball isolation pump) and the diaphragm pump (i.e., the Qihao pump). This pump combines the dual characteristics of the large flow of the water isolation pump and the high head of the diaphragm pump, with a maximum flow of 800 m3 / h and a maximum head of 10MPa. Due to the use of membrane isolation, there is no water consumption and no slurry mixing. Since the transmission medium is clean water, there is no oil consumption, so it also abandons the drawbacks of large water consumption of the water isolation pump, occasional slurry mixing, fast damage of the clean water pump, and oil consumption and environmental pollution of the isolation pump. Because of its excellent performance, the water diaphragm pump is widely used in the transportation of tailings and concentrates in ferrous and non-ferrous metal mines, chemical raw materials and other corrosive media.

[0003] In recent years, with the continuous development of the chemical industry and the mining industry, the demand for transportation volume has continued to increase. As an important old industrial base and main agricultural production area in my country, the Northeast region has continued to grow in demand for fluid conveying equipment in the fields of mineral resource development, chemical production, sewage treatment and agricultural modernization. With its unique performance advantages, the water diaphragm pump has shown significant application potential in the Northeast market. According to a large number of market evaluation feedback, the performance of the water diaphragm pump in conveying high-concentration tailings slurry is unique, so it is widely used. However, there are still some problems with the water diaphragm pump. The check valve, as the core fluid control component of the water diaphragm pump, plays a vital role in the operation of the water diaphragm pump. However, in the working process, the check valve will hit the valve seat due to the impact of the liquid flow, causing noise, tank swing and untimely valve opening and closing. This has greatly reduced the reliability of the equipment and the loss of operating efficiency, which has greatly affected the economic benefits of the enterprise. Therefore, the development of a water diaphragm pump that prevents backflow and water shock waves has become the key at present. Summary of the invention

[0004] Check valve, also known as one-way valve, is an automatic valve. Its core function is to drive the valve disc (or valve core) to move through fluid pressure to ensure the one-way flow of the medium and prevent reverse backflow. In the water diaphragm pump, the check valve is a key component to achieve medium suction and discharge, which directly affects the volumetric efficiency and operation stability of the pump. The check valve of the water diaphragm pump should be composed of front and rear valve bodies, steel balls, cone bodies, etc. And the working principle is: Opening process: When the water pump starts or the fluid flows forward, the pressure generated by the medium pushes the steel ball to move, so that the steel ball leaves the valve seat sealing surface along the guide column, and the check valve opens. At this time, the valve disc of the check valve opens, and the medium can pass through the valve smoothly. Closing process: When the water pump stops or the fluid flows in the reverse direction, the pressure of the medium pushes the steel ball to roll along the guide column to the valve seat sealing surface, thereby closing the check valve and preventing the fluid from flowing in the reverse direction. In summary, the ball check valve uses the short-stroke rolling of the steel ball in the ball cover to achieve opening and closing, effectively controlling the unidirectional flow of the fluid, preventing backflow and water hammer, and protecting the safe operation of the pipeline system. However, due to the large and unstable working pressure of the system, the check valve is unstable under the impact of water hammer. Therefore, the present invention provides a water diaphragm pump that prevents backflow and water hammer, and its specific technical implementation scheme is to provide an integrated valve body device, whose specific structure consists of: (1) top cover sleeve, (2) upper cylinder cover, (3) buffer sleeve, (4) piston, (5) cylinder, (6) lower cylinder cover, (7) bracket, (8) screw hook, (9) oil injection sleeve, (10) stuffing box, (11) spring, (12) pressure cover, (13) valve stem, (14) valve core, (15) valve body. The integrated valve body device comprises a valve body component composed of: (13) a valve stem, (14) a valve core, and (15) a valve body. The (14) valve core is driven by the (13) valve stem to open and close the flow channel. The buffer lubrication system comprises: (5) a cylinder, (4) a piston, (2) an upper cylinder head, (6) a lower cylinder head, and (3) a buffer sleeve. The (3) buffer sleeve is nested in the inner wall of the (5) cylinder and cooperates with the (4) piston to form a dynamic buffer chamber. The mechanical impact is absorbed by the reciprocating motion of the (4) piston. The oil injection lubrication structure comprises: (9) an oil injection sleeve integrated with the On the (5) cylinder side wall, oil is continuously supplied to the (3) buffer sleeve and (13) valve stem guide through the internal oil channel, and the multi-layer sealing ring of the (10) stuffing box is cooperated to achieve lubrication and sealing coordination; Sealing optimization module: The (10) stuffing box adopts a stepped sealing groove and a composite sealing ring preloaded by a built-in spring. The gland dynamically adjusts the sealing pressure through bolts to adapt to the deformation of the (13) valve stem during movement; Structural support unit: The (7) bracket is connected to the steel base to provide overall rigid support. At the same time, the (6) lower cylinder head is designed to be a detachable structure for easy maintenance.The beneficial effects of the present invention are as follows: 1. Buffering and lubrication coordination: (3) The buffer sleeve and (9) oil injection sleeve are integrated into a design to achieve self-lubrication while absorbing impact, reduce component wear, and extend service life; 2. Reliable dynamic sealing: The spring-preloaded stepped sealing structure, combined with the (12) gland dynamic adjustment, ensures the sealing stability during the movement of the (13) valve stem; 3. Convenient maintenance: The modular design (such as the detachable (6) lower cylinder cover and the (9) oil injection sleeve external interface) reduces the complexity of maintenance; 4. Efficient and compact: Through the integrated layout of the (5) cylinder and the (15) valve body, the space occupation is reduced and it is suitable for small installation environments. The present invention is particularly suitable for high-pressure pipeline systems in the fields of petroleum, chemical industry, etc., and has the advantage of preventing backflow and water shock waves. BRIEF DESCRIPTION OF THE DRAWINGS

[0005] Figure 1 It is a three-dimensional modeling diagram and internal structure diagram of the integrated valve body device; Figure 2 This is the working principle diagram of the check valve. DETAILED DESCRIPTION

[0006] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that these implementation methods are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0007] Example 1: Structure and assembly of integrated valve body device The integrated valve body device includes the following components: Valve body component: A flow channel is provided inside the valve body (15), and the valve core (14) is connected to the external actuator through the valve stem (13). The valve core is a conical structure and cooperates with the flow channel opening in the valve body to achieve sealing. Buffer lubrication system: The cylinder (5) is coaxially fixed to the top of the valve body, and the buffer sleeve (3) is nested inside. The piston (4) is connected to the valve stem (13) through threads, and the upper and lower cylinder covers (2, 6) are bolted to the two ends of the cylinder to form a closed buffer chamber. Oil injection lubrication structure: The oil injection sleeve (9) is embedded in the side wall of the cylinder, and an annular oil channel is provided inside it. The oil channel is connected to the buffer chamber and the valve stem guide part through radial holes; an oil injection port is provided at the outer end of the oil injection sleeve, and an external lubrication pump can be connected to achieve continuous oil supply. Sealing optimization module: The stuffing box (10) is located between the valve body and the valve stem, and adopts a three-level stepped sealing groove. The groove is installed with a polytetrafluoroethylene sealing ring and a metal-graphite composite ring pre-tightened by a spring (11). The top is pressed by a gland (12), and the gland bolts can adjust the pressing force. Support unit: The bracket (7) is welded to the bottom of the valve body and fixed to the pipeline flange through a steel base. The lower cylinder cover (6) is designed as a detachable flange structure and is connected to the cylinder by bolts. The assembly steps of the integrated valve body device include the following: pressing the buffer sleeve (3) into the inner wall of the cylinder (5) and installing the piston (4) to the end of the valve stem (13); sequentially assembling the cylinder cover (2) and the cylinder (5) to the top of the valve body (15) and fixing them by bolts; embedding the oil injection sleeve (9) into the reserved hole on the side wall of the cylinder to ensure that the oil passage is connected to the buffer chamber; sequentially installing the sealing ring and the spring (11) into the stepped groove of the stuffing box (10), and tightening the gland (12) to a preset torque; welding the bracket (7) to the bottom of the valve body and fixing it to the pipeline system through the base.

[0008] Example 2: Working process and lubrication seal coordination The buffering and lubrication process of the integrated valve body device: High-pressure shock absorption: When the valve is closed quickly, the valve stem (13) drives the piston (4) to move downward, the volume of the buffer chamber decreases, and the oil in the chamber slowly releases pressure through the microporous structure of the buffer sleeve (3), thereby realizing kinetic energy buffering. Self-lubricating oil supply: The oil channel of the oil injection sleeve (9) simultaneously delivers the lubricating oil to the buffer chamber and the guide part of the valve stem (13), forming an oil film lubrication, thereby reducing the friction between the piston (4) and the cylinder (5), and the valve stem (13) and the stuffing box (10). Dynamic sealing adjustment of the integrated valve body device: Step seal adaptation: When the valve stem moves, the spring (11) pushes the composite sealing ring to fit the surface of the valve stem (13), and the stepped sealing groove shares the medium pressure in different directions, thereby avoiding single-point wear. Gland pressure adjustment: If there is a slight leak in the seal, the preload can be increased by tightening the gland bolts, and the sealing performance can be restored without stopping the machine.

[0009] Example 3: Maintenance and disassembly The maintenance and disassembly of the integrated valve body device includes the following: buffer system maintenance: remove the bolts of the cylinder head (6), take out the piston (4) and the buffer sleeve (3), replace the worn parts and then re-fill with oil; seal assembly replacement: loosen the gland (12), take out the old sealing rings in turn, install the new rings and tighten them in a stepped sequence; oil filling sleeve cleaning: reversely inject a cleaning agent through the oil filling port to remove impurities in the oil channel.

[0010] The above are only several embodiments of the present invention. Although the embodiments disclosed by the present invention are as above, the above contents are only embodiments adopted for facilitating the understanding of the present invention and are not used to limit the present invention. Any technician in the technical field to which the present invention belongs can make any modification and change in the form and details of the embodiments without departing from the spirit and scope disclosed by the present invention, but the patent protection scope of the present invention shall still be subject to the scope defined by the attached claims.

Claims

1. A water diaphragm pump for preventing backflow and water shock wave, characterized in that: Its structure and its specific technical implementation scheme are to provide an integrated valve body device, and its specific structure consists of: (1) top cover sleeve, (2) upper cylinder cover, (3) buffer sleeve, (4) piston, (5) cylinder, (6) lower cylinder cover, (7) bracket, (8) screw hook, (9) oil injection sleeve, (10) stuffing box, (11) spring, (12) pressure cover, (13) valve stem, (14) valve core, and (15) valve body.

2. The assembly of an integrated valve body device provided by a water diaphragm pump for preventing backflow and water shock waves as described in claim 1 is as follows: press the buffer sleeve (3) into the inner wall of the cylinder (5), and install the piston (4) to the end of the valve stem (13); assemble the cylinder cover (2) and the cylinder (5) to the top of the valve body (15) in sequence and fix them with bolts; embed the oil filling sleeve (9) into the reserved hole on the side wall of the cylinder to ensure that the oil channel is connected to the buffer chamber; install the sealing ring and the spring (11) in the stepped groove of the stuffing box (10) in sequence, and tighten the pressure cover (12) to the preset torque; weld the bracket (7) to the bottom of the valve body, and fix it to the pipeline system through the base.

3. The maintenance and disassembly method of an integrated valve body device provided by a water diaphragm pump for preventing backflow and water shock waves as described in claim 2 is as follows: The maintenance and disassembly of the integrated valve body device includes the following: Buffer system maintenance: remove the bolts of the cylinder head (6), take out the piston (4) and the buffer sleeve (3), replace the worn parts and re-oil; Replace the sealing assembly: loosen the pressure cover (12), take out the old sealing rings in turn, install the new rings and tighten them in a step-by-step order; Clean the oil filling sleeve: reversely inject the cleaning agent through the oil filling port to remove impurities in the oil channel.

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