CN103362878B - Adjustable volume diaphragm-type pulsation absorbs accumulator - Google Patents

Abstract

The invention discloses a volume-adjustable diaphragm type pulsation absorption accumulator, that is, the upper and lower shells are connected by locking bolts, the bowl-shaped diaphragm is arranged between the upper and lower shells, and the valve core, hollow valve stem and sleeve are sequentially socketed. It is located in the opening on the top of the upper casing and connected by threads respectively. The valve cover is connected to the top of the hollow valve stem by threads. The retaining ring and spring are arranged in the counterbore at the top of the hollow valve stem. The piston is horizontally arranged in the upper casing and connected by screws. The bottom surface of the sleeve and the center of the piston are provided with a tapered through hole and form an isolated valve port with the conical inclined surface of the outer ring at the bottom of the hollow valve stem. The charging valve port, the bowl-shaped diaphragm, the upper casing and the piston form a working cavity, and the upper casing, the piston and the sleeve form a regulating cavity. The accumulator can adjust the volume according to the demand of the hydraulic system, change the physical characteristics, make it work at the best working point for absorbing pressure pulsation, and improve the control accuracy and performance of the hydraulic system.

Description

Diaphragm pulsation absorption accumulator with adjustable volume

technical field

The invention relates to a diaphragm type pulsation absorption accumulator with adjustable volume.

Background technique

Accumulators are widely used in various hydraulic systems. Accumulators are an energy storage device in hydraulic and pneumatic systems. When the pressure increases, it converts the compression energy or potential energy into hydraulic or pneumatic energy and releases it to supply the system again; when the system pressure increases instantaneously, it can absorb this part of the energy to ensure the normal pressure of the entire system. At the same time, the liquid discharged from the hydraulic pump in the hydraulic system has a large pulsation, which will cause noise and vibration in the hydraulic system, and destroy the stability of the system. Using an accumulator at the outlet of the hydraulic pump can effectively attenuate the system pulsation , to make the device work smoothly, which is especially important in some precision equipment. The traditional accumulators are all constant volume accumulators, the volume of the accumulator is not adjustable, and the physical parameters are constant. It often cannot achieve the best effect when used as a pressure pulsation absorbing device. Excessive volume of the actuator will affect the response time of the hydraulic system, especially for the servo hydraulic system, which seriously affects the control accuracy and performance of the servo hydraulic system.

Contents of the invention

The technical problem to be solved by the present invention is to provide a volume-adjustable diaphragm type pulsation absorption accumulator, which can adjust the working volume of the accumulator according to the demand of the hydraulic system, change the physical characteristics of the accumulator, and make the accumulator work At the best working point for absorbing pressure pulsation, the control accuracy and performance of the servo hydraulic system are effectively improved.

In order to solve the above technical problems, the volume-adjustable diaphragm type pulsation absorbing accumulator of the present invention includes an upper casing, a lower casing, a piston, a bowl-shaped diaphragm, a lock nut, a valve core, a hollow valve stem, a sleeve, a valve cover, Gaskets, retaining rings and springs, the bottom of the lower housing is provided with an installation port and the top outer ring is provided with external threads, the bowl-shaped diaphragm is located in the lower housing and its top covers the top surface of the lower housing , the upper casing is arranged on the top surface of the lower casing and screwed on the outer ring of the lower casing by the lock nut to fasten the lower casing and the bowl-shaped diaphragm, the top of the upper casing is open and the inner ring is set There are threads, the inner ring and the outer ring of the upper part of the sleeve are respectively provided with threads and screwed to the threads at the top of the upper casing and are located in the upper casing, between the middle part of the sleeve and the upper casing It is sealed by a sealing ring and a through hole is provided horizontally on the bottom end of the cylinder wall. The upper part of the hollow valve stem is provided with a step and the two sides of the step are respectively provided with external threads. The top of the hollow valve stem is provided with a counterbore. The external thread on the lower side of the step is screwed on the inner thread of the sleeve and is located in the sleeve, the hollow valve stem and the sleeve are sealed by a sealing ring, the inner ring of the valve cover is threaded and screwed on The top of the hollow valve stem, the gasket is arranged between the valve cover and the hollow valve stem, the valve core is located in the hollow valve stem, the retaining ring is inserted into the top of the valve core, and the spring The valve core is inserted into the valve core and located in the counterbore at the top of the hollow valve stem, and the two ends abut against the retaining ring and the bottom surface of the counterbore of the hollow valve stem, and the piston is horizontally arranged in the upper casing and between the two. Sealed by a sealing ring, the piston is connected to the bottom surface of the sleeve by screws and has a tapered through hole in the center, the bottom end of the sleeve is located on the top surface of the piston, and the bottom end of the hollow valve stem is located on the piston. The inner and outer rings of the central through hole are tapered slopes, the tapered through hole of the piston and the tapered slope of the outer ring of the hollow valve stem form an isolated valve port, the inner ring at the bottom of the hollow valve stem and the outer ring of the valve core They are matching conical slopes and form an inflation valve port, a working cavity is formed between the bowl-shaped diaphragm, the upper casing and the piston, and an adjusting cavity is formed between the upper casing, the piston and the sleeve. 

Further, the accumulator further includes sealant, and the sealant is coated between the bottom surface of the sleeve and the top surface of the piston.

Since the volume-adjustable diaphragm type pulsation absorbing accumulator of the present invention adopts the above-mentioned technical scheme, that is, the upper casing and the lower casing are connected by locking bolts, the bowl-shaped diaphragm is arranged between the upper casing and the lower casing, and the valve core , the hollow valve stem, and the sleeve are sequentially socketed in the opening at the top of the upper casing and are respectively threaded. The valve cover is threaded to the top of the hollow valve stem. It is installed horizontally in the upper casing and connected to the bottom of the sleeve by screws. The center of the piston is provided with a conical through hole and forms an isolation valve port with the conical inclined surface of the outer ring at the bottom of the hollow stem. The inner ring at the bottom of the hollow stem and the outside of the valve core The rings are matched conical slopes and form the inflation valve port, the working cavity is formed between the bowl-shaped diaphragm, the upper casing and the piston, and the regulating cavity is formed between the upper casing, the piston and the sleeve. The accumulator can adjust the working volume of the accumulator according to the demand of the hydraulic system, change the physical characteristics of the accumulator, make the accumulator work at the best working point for absorbing pressure fluctuations, and effectively improve the control accuracy and performance of the servo hydraulic system.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail:

Fig. 1 is a structural schematic diagram of the volume-adjustable diaphragm type pulsation absorbing accumulator of the present invention.

Detailed ways

As shown in Figure 1, the volume-adjustable diaphragm type pulsation absorbing accumulator of the present invention includes an upper housing 1, a lower housing 2, a piston 3, a bowl-shaped diaphragm 4, a lock nut 5, a valve core 8, and a hollow valve stem 7 , sleeve 6, valve cover 9, gasket 91, retaining ring 92 and spring 93, the bottom of the lower housing 2 is provided with a mounting port 21 and the top outer ring is provided with external threads, the bowl-shaped diaphragm 4 is located in the The upper casing 1 is arranged on the top surface of the lower casing 2 and screwed to the outside of the lower casing 2 through the locking nut 5 The lower casing 2 and the bowl-shaped diaphragm 4 are fastened with ring threads, the top of the upper casing 1 is open and the inner ring is provided with threads, and the inner ring and outer ring on the upper part of the sleeve 6 are respectively provided with threads and screwed on the The thread on the top of the upper casing 1 is located in the upper casing 1, the middle part of the sleeve 6 and the upper casing 1 are sealed by a sealing ring 11 and a through hole 61 is horizontally provided on the bottom wall of the sleeve, so The upper part of the hollow valve stem 7 is provided with a step 71 and the two sides of the step 71 are respectively provided with external threads. The top of the hollow valve stem 7 is provided with a counterbore 72. The inner ring of the sleeve 6 is threaded and located in the sleeve 6, the hollow valve stem 7 and the sleeve 6 are sealed by a sealing ring 62, the inner ring of the valve cover 9 is threaded and screwed in the hollow The top end of the valve stem 7, the sealing gasket 91 is arranged between the valve cover 9 and the hollow valve stem 7, the valve core 8 is located in the hollow valve stem 7, and the retaining ring 92 is inserted into the valve core 8 top, the spring 93 is inserted into the valve core 8 and is located in the counterbore 72 at the top of the hollow valve stem 7. 3 is horizontally arranged in the upper casing 1 and sealed by a sealing ring 32 between the two, the piston 3 is connected to the bottom surface of the sleeve 6 through a screw 33 and a tapered through hole 31 is provided in the center, and the sleeve 6. The bottom end is located on the top surface of the piston 3. The bottom end of the hollow valve stem 7 is located in the central through hole 31 of the piston 3 and the outer ring is a conical inclined surface. The conical surface through hole 31 of the piston 3 is The conical slope of the outer ring of the hollow valve stem 7 forms an isolation valve port 34, the inner ring of the bottom end of the hollow valve rod 7 and the outer ring of the valve core 8 are respectively matching conical slopes and form an inflation valve port 35, and the bowl-shaped A working cavity 36 is formed between the diaphragm 4 , the upper casing 1 and the piston 3 , and an adjusting cavity 37 is formed between the upper casing 1 , the piston 3 and the sleeve 6 .

Further, the accumulator further includes a sealant 36 coated between the bottom surface of the sleeve 6 and the top surface of the piston 3 . To ensure the seal between the bottom surface of the sleeve and the top surface of the piston.

The accumulator is installed in the hydraulic system through the installation port at the bottom of the lower casing. When it is working, it first performs the inflation operation, removes the valve cover, takes out the gasket, and adjusts the hollow valve stem to move upward. At this time, the valve port is isolated Open, the top of the hollow valve stem is connected to the high-pressure nitrogen gas charging device, under the action of the high-pressure gas, the valve core is pushed down against the force of the spring, so that the charging valve port is opened, the high-pressure gas enters the working cavity, and the gas in the working cavity passes through The through hole of the isolation valve port and the sleeve enters the regulating cavity. After inflating, remove the inflating device, and the valve core of the accumulator moves up under the action of internal high-pressure gas and spring, so that the inflating valve port is closed, and the high-pressure gas remains in the accumulator. At this time, reinstall the valve cover and gasket to complete the inflation operation. Then adjust the hollow valve stem to move up to close the isolation valve port, so that the working cavity becomes a closed cavity, which plays the role of energy storage of the accumulator.

According to the needs of the hydraulic system, when adjusting the volume of the accumulator, firstly adjust the hollow valve stem to open the isolation valve port; then twist the sleeve to move the sleeve up and down, thereby driving the piston to move in the upper shell and changing the working cavity and adjust the volume of the cavity, and at the same time, the high-pressure gas in the working cavity and the regulating cavity flows through the through hole of the isolation valve port and the sleeve to ensure that the air pressure in the two cavities is consistent. When the volume adjustment is completed, the hollow valve stem is adjusted to close the isolation valve port, and the working cavity becomes a closed cavity again. At this time, the working volume of the accumulator and the parameters of the object have changed to realize the adjustment of the accumulator volume. The accumulator changes the volume of the working cavity through the piston. During the adjustment process, the working cavity and the adjusting cavity are connected. After the adjustment is completed, the working cavity and the adjusting cavity are closed, so that the volume of the working cavity of the accumulator can be adjusted. The defects of traditional accumulators are avoided, and the response time, control accuracy and performance of the hydraulic system are improved.

Claims (2)

1. A volume-adjustable diaphragm-type pulsation-absorbing accumulator, characterized in that: the accumulator includes an upper casing, a lower casing, a piston, a bowl-shaped diaphragm, a lock nut, a valve core, a hollow valve stem, a sleeve cylinder, bonnet, gasket, retaining ring and spring, the bottom of the lower housing is provided with an installation port and the top outer ring is provided with external threads, the bowl-shaped diaphragm is located in the lower housing and its top covers the The top surface of the lower casing, the upper casing is arranged on the top surface of the lower casing and screwed to the outer ring of the lower casing by the lock nut to fasten the lower casing and the bowl-shaped diaphragm, the top of the upper casing It is open and the inner ring is provided with threads, the inner ring and the outer ring on the upper part of the sleeve are respectively provided with threads and screwed to the threads on the top of the upper casing and are located in the upper casing, the middle part of the sleeve and the The upper casing is sealed by a sealing ring and a through hole is horizontally provided on the bottom end of the cylinder wall. The upper part of the hollow valve stem is provided with a step and external threads are respectively provided on both sides of the step. The top of the hollow valve stem is provided with a counterbore. The hollow valve stem is screwed to the thread of the inner ring of the sleeve through the external thread on the lower side of the step and is located in the sleeve. The space between the hollow valve stem and the sleeve is sealed by a sealing ring. The inner ring of the valve cover is set threaded and screwed on the top of the hollow valve stem, the gasket is set between the valve cover and the hollow valve stem, the valve core is located in the hollow valve stem, and the retaining ring is inserted into the valve core At the top end, the spring is inserted into the valve core and located in the counterbore at the top of the hollow valve stem, and both ends are against the retaining ring and the bottom surface of the counterbore of the hollow valve stem, and the piston is horizontally arranged in the upper casing The two are sealed by a sealing ring. The piston is connected to the bottom surface of the sleeve by screws and a conical through hole is provided in the center. The bottom end of the sleeve is located on the top surface of the piston, and the bottom of the hollow valve stem is The end is located in the central through hole of the piston and the outer ring is a conical inclined surface. The conical through hole of the piston and the tapered inclined surface of the outer ring of the hollow valve stem form an isolation valve port. The inner ring at the bottom end of the hollow valve stem and the outer ring of the valve core are respectively matching conical slopes and form an inflatable valve port, a working cavity is formed between the bowl-shaped diaphragm, the upper casing and the piston, and an adjustment is formed between the upper casing, the piston and the sleeve. cavity. 2. The volume-adjustable diaphragm-type pulsation-absorbing accumulator according to claim 1, characterized in that: the accumulator also includes sealant, and the sealant is coated on the bottom surface of the sleeve and the top of the piston. between faces.