Energy accumulator

Abstract

The invention discloses an energy accumulator, which relates to the technical field of fluid energy storage equipment and comprises an energy accumulator body, a piston, a heavy hammer and an air bag, the energy accumulator body comprises an energy accumulator cylinder body; the lower portion of the energy accumulator cylinder body is provided with an oil inlet connector, an oil discharge connector and an oil supply port, and the upper portion of the energy accumulator cylinder body is provided with an oil recovery port. The piston, the heavy hammer and the air bag are arranged in the energy accumulator cylinder body; the heavy hammer is arranged above the piston; an air bag is arranged in a central groove in the lower part of the piston; the piston lifting device comprises a driving unit and a pulley mechanism; the driving unit is connected with the pulley mechanism, and the pulley mechanism is connected with the piston, so that when the piston, the air bag and the heavy hammer act together, the effect of the heavy hammer energy accumulator which assists in increasing the pressure regulating reaction speed through the air bag is achieved; or when the driving unit, the pulley mechanism, the piston, the heavy hammer and the air bag act together, the effect of the heavy hammer energy accumulator which can adjust the output pressure through the driving unit and can assist in improving the pressure adjusting reaction speed through the air bag is achieved.

Description

Technical Field

[0001] This application belongs to the technical field of fluid energy storage devices, and particularly relates to an accumulator. Background Art

[0002] Hydraulic systems are widely used in various industries due to their high power density, large output force, etc., but at the same time, they also face the problem of low energy efficiency. Improving the energy efficiency of hydraulic systems has become particularly important. The Independent Metering and Control System (IMCS) breaks the structural coupling of the inlet and outlet ports of traditional hydraulic valves. By introducing additional control degrees of freedom and expanding the working modes, it improves the control flexibility of the system; by changing the flow path, it realizes energy recovery and regeneration, significantly reducing energy consumption. In addition, IMCS introduces electronic sensors and software programming control, further improving the intelligence level of hydraulic systems. Compared with traditional hydraulic systems, the unique circuit structure of the independent metering system increases the control degrees of freedom and information perception, achieving high energy efficiency, strong compatibility, and excellent control performance. However, these characteristics also pose higher requirements for component and system control work. Although there are many independent metering control multi-way valves and their hydraulic systems on the market, in addition to some problems that need to be urgently solved in engineering or factory applications, the problem of low energy efficiency of the pump source, especially the low efficiency of the pump source system with a fixed displacement pump + relief valve, needs to be solved more urgently.

[0003] In existing machinery manufacturing enterprises, due to the large number and concentration of hydraulic equipment in the factory, each hydraulic equipment generally uses an independent pump station to meet the high, medium, and low pressure levels or flow supply levels. And the hydraulic system is equipped with a relief valve to maintain pressure stability, but the relief valve system usually has the problem of low efficiency. Especially in the standby state of the equipment, the overflow loss is greater, the oil temperature rise is greater, and auxiliary heat dissipation settings are required to cool the oil, thus further consuming social resources such as electricity and increasing the temperature rise of the environment. Therefore, a new solution is urgently needed. In the prior art, accumulators are usually used to assist in solving the above problems, and the role of accumulators in hydraulic systems is indispensable. They not only serve as auxiliary energy sources to ensure the stable operation of hydraulic systems during intermittent operations or long working time cycles, but also can be used as power sources in emergencies to ensure the stability of the system in case of unexpected situations such as sudden power outages, avoiding damage or safety accidents. There are the following three types of conventional accumulators:

[0004] The first type is the spring accumulator, which has a simple structure, but its capacity is small, and it is more suitable for low-pressure and low-cycle frequency environments. In higher-pressure situations, its response ability decreases, so it is not suitable for higher-pressure occasions;

[0005] The second type is a conventional weight-loaded accumulator, which stores and releases energy through the position change of a weight; when the weight passes through the plunger, it exerts a force on the hydraulic oil, thereby generating pressure. This type of accumulator has a simple structure, but its pressure is relatively low and its sensitivity is slightly poor. It is usually only suitable for the hydraulic systems of large fixed equipment and cannot be applied to occasions with fast response and high pressure requirements;

[0006] The third type is a gas-loaded accumulator, which stores and releases energy through the expansion and compression of a sealed gas; this type of accumulator usually fills with inert gas or nitrogen inside; its specific types include bladder accumulators and piston accumulators; among them, bladder accumulators are usually used in low-pressure and low-frequency occasions, with a low energy density, not supporting high-frequency energy storage and release, and the volume of bladder accumulators is limited and cannot be made too large, unable to withstand great pressure, and once the bladder ruptures, it will cause the accumulator to suddenly fail; while piston accumulators are usually more suitable for low-pressure situations and not suitable for high-frequency movements; and piston accumulators have very high requirements for the sealing effect of seals and the machining accuracy of the inner wall of the housing, so the required process accuracy is relatively high, otherwise it is easy to cause leakage. Therefore, the cost of piston accumulators is higher than that of other accumulators.

[0007] Therefore, for existing conventional accumulators, some are sensitive but have a small capacity or low pressure, some have a high pressure but a slow response, and some have a fast response and can have a high pressure but a small capacity. It is difficult to meet the needs of centralized energy supply. Therefore, there is an urgent need to develop an accumulator that can meet the needs of centralized energy supply, which can not only provide centralized energy for unified supply of oil hydraulic energy to each device, improve the utilization rate of the hydraulic system, but also reduce or eliminate hydraulic overflow losses during no-load conditions and provide a reliable and stable pressure hydraulic energy. Summary of the Invention

[0008] This application provides an accumulator to solve the above technical problems, that is, to develop an accumulator that can meet the needs of centralized energy supply, which can not only provide centralized energy for unified supply of oil hydraulic energy to each device, improve the utilization rate of the hydraulic system, but also reduce or eliminate hydraulic overflow losses during no-load conditions and provide a reliable and stable pressure hydraulic energy.

[0009] The technical solution adopted in this application is as follows:

[0010] An accumulator, comprising an accumulator body, a piston, a weight and an airbag; the accumulator body includes an accumulator cylinder body; the lower part of the accumulator cylinder body is provided with an oil inlet interface, an oil drain interface and an oil supply port, and the upper part of the accumulator cylinder body is provided with an oil recovery port; the piston, the weight and the airbag are arranged in the accumulator cylinder body; the weight is arranged above the piston; the airbag is arranged in the central groove at the lower part of the piston; the piston lifting device includes a driving unit and a pulley mechanism; the driving unit is connected to the pulley mechanism, and the pulley mechanism is connected to the piston, so that when the piston, the airbag and the weight act together, the function of the weight accumulator for assisting in improving the pressure regulating reaction speed through the airbag is realized; or when the driving unit, the pulley mechanism, the piston, the weight and the airbag act together, the function of the weight accumulator that can not only adjust the output pressure through the driving unit but also assist in improving the pressure regulating reaction speed through the airbag is realized; the piston includes a piston body, a sealing ring and a lifting ring; a sealing ring is arranged between the circumferential side of the piston body and the accumulator cylinder body, and a pressure regulating support tire is arranged inside the sealing ring. By adjusting the inflation pressure inside the pressure regulating support tire, the movement friction resistance or the oil leakage amount of the sealing ring between the piston and the accumulator cylinder body can be controlled; an oil storage space for leaked oil is arranged at the upper part of the piston, and the stored oil can provide lubricating infiltration of oil for the sealing ring between the piston and the accumulator cylinder body from the upper part, so as to reduce friction and improve the flexibility of the overall up and down movement of the weight piston and the acceleration reaction ability.

[0011] As a preferred embodiment, the pulley mechanism includes a first pulley, a second pulley, a third reel, a first connecting rope and a second connecting rope; the central axis of the first pulley is connected to the lifting ring on the piston through the first connecting rope; the central axis of the second pulley is arranged above the first pulley, the second pulley is a fixed pulley, the third reel is connected to the driving unit, one end of the second connecting rope is arranged on the central axis of the second pulley or the fixed end of the second pulley, and then after passing around the first pulley and the second pulley, the other end is wound and connected to the third reel; a clutch and a brake device are arranged between the driving unit and the third reel. The driving unit can drive the third reel to rotate, so that the second connecting rope can drive the central axis of the first pulley to move up and down, and further drive the first connecting rope and the piston to rise along the accumulator cylinder body or control the descending speed of the piston; the driving unit and the third reel are separated or combined through the clutch; the third reel is slowed down or stopped through the brake device, so as to realize the piston slowing down the descending speed or hovering.

[0012] As a preferred embodiment, an annular groove is formed in the outer periphery of the piston body, and the sealing ring is arranged in the annular groove; a lifting ring for connecting with the first connecting rope is connected to the top of the piston body; the sealing ring includes a support ring, a pressure regulating support tire and a sealing sliding ring; the support ring includes an upper support ring and a lower support ring; the upper support ring and the lower support ring are connected to the upper and lower sides of the annular groove; the pressure regulating support tire is arranged in the annular groove between the support ring and the lower support ring; the sealing sliding ring is arranged between the pressure regulating support tire and the accumulator cylinder body, the upper part of the sealing sliding ring is fixed by the upper support ring, and the lower part of the sealing sliding ring is fixed by the lower support ring.

[0013] As a preferred embodiment, a first inflation channel is formed in the piston body; a second inflation channel is formed in the upper support ring; an inflation hose is arranged in the first inflation channel, one end of the inflation hose passes through the second inflation channel of the upper support ring and is connected to the pressure regulating support tire, and the other end of the inflation hose communicates with a first inflation port outside the accumulator cylinder body, and the first inflation port is used for connecting with an external inflation mechanism.

[0014] As a preferred embodiment, an airbag is arranged in the central groove at the lower part of the piston, and a third inflation channel connected to the airbag is further formed in the piston body; one end of the third inflation channel communicates with the middle part in the central groove at the lower part of the piston, and a sealing ring surface and a thread are formed. A sealing rubber is arranged around the inflation port of the airbag, the sealing rubber corresponds to the sealing ring surface, and the sealing rubber is pressed against the sealing ring surface through the stud at the inflation port of the airbag and the thread at the lower end of the third inflation channel to form a sealing band, preventing the oil liquid in the piston cylinder from entering the interior of the third inflation channel. The other end of the third inflation channel communicates with an airbag inflation hose, and the other end of the airbag inflation hose communicates with a second inflation port outside the accumulator cylinder body for inflating or deflating the airbag, and the second inflation port is used for connecting with an external nitrogen filling trolley.

[0015] As a preferred embodiment, at least one oil return channel is further formed in the piston body; a recovery check valve is connected inside the oil return channel, and the recovery check valve is used to ensure that the oil inside the accumulator cylinder does not flow back above the piston body; the recovery check valve has a preset back pressure, which can ensure that the oil above the piston can lubricate the sealing slip ring through the gap between the piston and the accumulator cylinder during the downward working state of the piston, rather than returning to the inside of the accumulator cylinder through the oil return channel; the recovery check valve can be opened during the upward movement of the piston body along the accumulator cylinder, so that the oil above the piston returns to the inside of the accumulator cylinder through the oil return channel, to prevent the emergence of vacuum bubbles or steam bubbles generated by the suction effect of the piston moving upward in the accumulator cylinder; the upper end of the oil return channel is connected with a filter screen or a filter; an exhaust channel is further formed in the piston body, and a gas-liquid recovery annular groove is annularly formed on the inner wall surface of the central groove of the piston body to fully absorb the gas in the central groove; the exhaust channel extends vertically along the piston body to the gas-liquid recovery annular groove, so that the gas-liquid recovery annular groove is communicated with the exhaust channel, and an exhaust valve is connected above the exhaust channel.

[0016] As a preferred embodiment, weight fixing grooves are symmetrically arranged around the lifting ring at the upper part of the piston body, and weights with the same weight and volume are respectively arranged in the two weight fixing grooves on both sides; a liquid level alarm is arranged at the upper outlet of the oil return channel, and the alarm lower threshold set by the liquid level alarm is not higher than the filter screen above the oil return channel; a cavity facing the inside of the accumulator cylinder is arranged in the central groove of the piston body, and the airbag is in an inverted cone shape and is arranged in the cavity of the piston body to ensure that it does not abut against the peripheral wall surface of the cavity.

[0017] As a preferred embodiment, a piston position sensor is arranged on the accumulator cylinder; the piston position sensor is arranged outside the accumulator cylinder and does not contact the piston body; an induction device corresponding to the piston position sensor is arranged on the piston body; the piston position sensor sets an alarm lower threshold and an upper threshold; by feeding back the liquid level data measured by the liquid level alarm on the piston body to the drive unit, the drive unit can adjust the rising speed of the piston along the accumulator cylinder, so as to prevent the oil above the piston from being completely sucked in due to the piston rising too fast along the accumulator cylinder, and further prevent the air above the accumulator cylinder from being sucked in.

[0018] As a preferred embodiment, a dust-proof cover is arranged outside the accumulator cylinder, and a sealing ring or a tie is arranged at the connection between the dust-proof cover and the first connecting rope to prevent dust from entering the upper part of the piston body between the dust-proof cover and the first connecting rope; a groove or a snap ring is arranged between the dust-proof cover and the outer wall of the accumulator cylinder for fixing the edge of the dust-proof cover on the outside of the accumulator cylinder.

[0019] As a preferred embodiment, a fourth air flow channel is further connected to the lower edge where the upper part of the accumulator cylinder body is connected to the dust cover. An air drying filter is provided on the channel to ensure that the air above the piston body in the dust cover and in the accumulator cylinder can circulate after being filtered and dried through the air drying filter, preventing water vapor from entering the upper part of the piston.

[0020] Due to the adoption of the above technical solutions, the beneficial effects obtained by this application are as follows:

[0021] 1. The accumulator of this application includes an accumulator body, a weight, a piston, an airbag, and a piston lifting device; the accumulator body includes an accumulator cylinder body; one side of the accumulator cylinder body has an oil inlet interface; the piston, the weight, and the airbag are arranged in the accumulator cylinder body; the weight is arranged above the piston; the airbag is arranged in the central groove at the lower part of the piston; a pressure regulating support tire is also connected between the periphery of the piston and the accumulator cylinder body; among them, the airbag can improve the problem that the sensitivity of the conventional weight-type accumulator is slightly poor; the piston lifting device of the accumulator includes a driving unit and a pulley mechanism; the driving unit can drive the piston to move upward along the accumulator cylinder body through the pulley mechanism for supplementing the oil in the accumulator cylinder body or for reducing the output pressure of the accumulator; or, after suspending the piston or when the piston reaches the upper dead center or the lower dead center of the pulley mechanism, set the inflation pressure of the pressure regulating support tire to ensure sufficient sealing conditions, and set the inflation pressure in the airbag to regulate the pressure of the accumulator to achieve the function of an airbag-type accumulator. Or, by allowing the driving unit to float freely with the piston, set the inflation pressure of the pressure regulating support tire in the piston, and adjust it by using the self-weight of the piston and the number of weights of different weights, so that the pressure of the oil in the accumulator cylinder body reaches the required constant pressure state, playing the constant pressure role of a weight-type accumulator. Or, the airbag and the weight act together to achieve the function of an accumulator with fast response under a constant pressure; or, the weight, the piston, and the driving unit act together to adjust the acting pressure of different pistons on the oil, and the airbag completes the ability to supply constant pressure energy for fast response or absorbing reverse impact.

[0022] The accumulator of this application can overcome the problems of the existing accumulators, such as high reaction sensitivity but small capacity or low pressure, or high pressure but slow reaction, or fast reaction but small capacity. It can achieve adjustable capacity, adjustable pressure, sensitive reaction, and meet the needs of centralized energy supply.

[0023] 2. The piston adopted in this application includes a piston body, a sealing ring, and a lifting ring; an oil return channel is provided on the piston body, which can be used for recovering the leaked oil, and a recovery check valve is arranged in the channel. The sealing ring is used to limit the oil leakage between the piston body and the accumulator cylinder block. The sealing ring can ensure a sufficient sealing gap δ between the piston body and the accumulator cylinder block according to the tire inflation amount and inflation pressure. According to the fact that when the leakage amount Q at both ends of the seal is certain, the pressure difference P - P0 = ΔP at both ends of the seal is inversely proportional to the cube of δ, it can be known that the smaller δ is, the higher the pressure P established inside the piston is, so as to adjust the pressure P through the tire inflation amount. Since the compressibility of the air in the tire is greater than that of rubber, etc., it has a larger floating seal margin, which can further reduce the gap or position accuracy between the cylinder block of the piston accumulator and the piston, and then reduce the processing difficulty, which provides the possibility to make a larger cylinder block and piston more economically, and further can increase the larger oil storage capacity of the accumulator to meet the centralized supply of hydraulic system energy for large fixed equipment or multiple equipment in the factory; by increasing the number of weights, it is beneficial to further increase the pressure of the accumulator. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are used to provide a further understanding of this application, and constitute a part of this application. The schematic embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation to this application. In the drawings:

[0025] Figure 1 is a schematic structural diagram of an accumulator under an embodiment of this application;

[0026] In the figure,

[0027] 1. accumulator body; 2. piston; 21. piston body; 22. sealing ring; 221. support ring; 222. pressure regulating support tire; 223. sealing sliding ring; 3. weight; 4. airbag; 5. central groove; 6. pulley mechanism; 61. first pulley; 62. second pulley; 63. third winding wheel; 64. first connecting rope; 65. second connecting rope; 7. first inflation channel; 8. inflation hose; 9. oil return channel; 10. recovery check valve; 11. air drying filter; 12. dust cover; 13. piston position sensor; 14. third inflation channel. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] In order to more clearly explain the overall concept of this application, the following will be described in detail by way of examples in combination with the drawings of the specification.

[0029] Many specific details are set forth in the following description in order to provide a thorough understanding of this application. However, this application may be implemented in other ways different from those described herein. Therefore, the protection scope of this application is not limited by the specific embodiments disclosed below.

[0030] In addition, in the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "top", "bottom", "inner", "outer", "axial direction", "radial direction", "circumferential direction", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0031] In the present application, unless otherwise clearly defined and limited, terms such as "installed", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present application, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to terms such as "embodiment", "example", "an embodiment", "example" or "specific example", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0033] The present application relates to an accumulator, such as Figure 1 shown, which includes an accumulator body 1, a piston 2, a weight 3 and an airbag 4; the accumulator body 1 includes an accumulator cylinder; the lower part of the accumulator cylinder has an oil inlet interface, an oil discharge interface and a supply oil port, and the upper part of the accumulator cylinder has an oil recovery port; the piston 2, the weight 3 and the airbag 4 are arranged in the accumulator cylinder; the weight 3 is arranged above the piston 2; the airbag 4 is arranged in the central groove 5 at the lower part of the piston 2; the hoisting device of the piston 2 includes a driving unit and a pulley mechanism 6; the driving unit is connected to the pulley mechanism 6, and the pulley mechanism 6 is connected to the piston 2, so that when the piston 2, the airbag 4 and the weight 3 act together, the function of the weight 3 accumulator that can assist in improving the pressure regulating reaction speed through the airbag 4 is realized; or, when the driving unit, the pulley mechanism 6, the piston 2, the weight 3 and the airbag 4 act together, the function of the weight 3 accumulator that can not only adjust the output pressure through the driving unit but also assist in improving the pressure regulating reaction speed through the airbag 4 is realized;

[0034] The piston 2 includes a piston body 21, a sealing ring 22 and a lifting ring; a sealing ring 22 is arranged between the circumferential side of the piston body 21 and the accumulator cylinder body, and a pressure regulating support tire 222 is arranged inside the sealing ring 22. By adjusting the inflation pressure inside the pressure regulating support tire 222, the movement friction resistance between the piston 2 and the accumulator cylinder body or the oil leakage amount of the sealing ring 22 can be controlled; there is an oil storage space for leaked oil above the piston 2, and the stored oil can provide lubrication and infiltration of oil for the sealing ring 22 between the piston 2 and the accumulator cylinder body from above, so as to reduce friction and improve the flexibility of the overall up and down movement of the piston 2 of the weight 3 and the acceleration response ability.

[0035] This application adjusts the set maximum output pressure of the oil in the cylinder of the piston 2 by the number of weights 3 with different weights. In addition, this application utilizes the airbag 4 inside the piston 2, which can supplement the problem of sudden decrease in the oil output pressure caused by the jamming of the piston 2; the airbag 4 inside the piston 2 can also be used to solve the problem of piston 2 jamming by adjusting the inflation pressure inside the pressure regulating support tire 222, and at the same time assist in stabilizing the pressure of the accumulator. In addition, in this application, the drive unit and the piston 2 can be independent of each other and in a floating state with no associated effect. Then, by reducing the inflation pressure in the pressure regulating support tire 222 to adjust the oil leakage amount between the piston 2 and the cylinder body, the maximum output pressure of the weight 3 accumulator can be reduced; and, by indirectly reducing the weight of the weight 3 above the piston 2 through the drive unit, the setting of the maximum output pressure of the accumulator can be adjusted, and a weight 3 accumulator effect that can respond quickly can be achieved; or, the drive unit, the pulley mechanism 6, the piston 2, the weight 3 and the airbag 4 act together to achieve a weight 3 accumulator effect that can adjust the output pressure and can respond quickly, where the quick response ability is mainly completed by the airbag 4 to complete the quick response or absorb the reverse impact.

[0036] It should be noted that the airbag 4 can adjust the pressure value in the airbag 4 by an external pressure regulating device, or an inflated airbag 4 can be used and the airbag 4 that has been filled with gas can be placed in the piston 2 of the weight 3.

[0037] As a preferred embodiment, the pulley mechanism 6 includes a first pulley 61, a second pulley 62, a third reel 63, a first connecting rope 64 and a second connecting rope 65;

[0038] The central axis of the first pulley 61 is connected to the lifting ring on the piston 2 through the first connecting rope 64; the central axis of the second pulley 62 is arranged above the first pulley 61, the second pulley 62 is a fixed pulley, the third reel 63 is connected to the drive unit, one end of the second connecting rope 65 is arranged on the central axis of the second pulley 62 or the fixed end of the second pulley 62, and then after passing around the first pulley 61 and the second pulley 62, the other end is wound and connected to the third reel 63;

[0039] A clutch and a brake device are arranged between the drive unit and the third reel 63. The drive unit can drive the third reel 63 to rotate, so that the second connecting rope 65 can drive the central axis of the first pulley 61 to move up and down, and then drive the first connecting rope 64 and the piston 2 to rise along the accumulator cylinder body or control the descending speed of the piston 2; the clutch is used to separate or combine the drive unit and the third reel 63; the brake device is used to slow down or stop the movement of the third reel 63, so as to slow down the descending speed of the piston 2 or make it hover.

[0040] Specifically, the drive unit involved in the present application can also be set as a hoisting wheel for suspending the weight 3, which is used to balance the weight of the weight 3 on the piston 2, so as to achieve the purpose of adjusting the output pressure of the weight 3 type accumulator.

[0041] As a preferred implementation manner, an annular groove is formed on the outer periphery of the piston body 21, and the sealing ring 22 is arranged in the annular groove; a lifting ring for connecting with the first connecting rope 64 is connected to the top of the piston body 21;

[0042] The sealing ring 22 includes a support ring 221, a pressure regulating support tire 222 and a sealing sliding ring 223; the support ring 221 includes an upper support ring 221 and a lower support ring 221; the upper support ring 221 and the lower support ring 221 are connected to the upper and lower sides of the annular groove; the pressure regulating support tire 222 is arranged in the annular groove between the support ring 221 and the lower support ring 221; the sealing sliding ring 223 is arranged between the pressure regulating support tire 222 and the accumulator cylinder body, the upper part of the sealing sliding ring 223 is fixed by the upper support ring 221, and the lower part of the sealing sliding ring 223 is fixed by the lower support ring 221.

[0043] Furthermore, an annular guiding groove is formed in the lower part of the outer periphery of the piston body 21, and a guiding block is arranged in the guiding groove. The guiding block has a conical structure with the conical angle facing downward, which ensures that the high-pressure oil at the lower part utilizes the automatic centering effect of the conical angle on the guiding block, facilitating the downward movement of the piston 2 and preventing jamming.

[0044] As a preferred implementation manner, a first inflation channel 7 is formed in the piston body 21; a second inflation channel is formed in the upper support ring 221; an inflation hose 8 is arranged in the first inflation channel 7. One end of the inflation hose 8 passes through the second inflation channel of the upper support ring 221 and is connected to the pressure regulating support tire 222, and the other end of the inflation hose 8 communicates with the first inflation port outside the accumulator cylinder body, and the first inflation port is used to connect with an external inflation mechanism.

[0045] It should be noted that the inflation mechanism is a nitrogen filling trolley or a compressed air pipeline, etc. The purpose of setting the nitrogen filling trolley or the compressed air pipeline is to achieve low air cost, high nitrogen cost and high pressure.

[0046] As a preferred embodiment, an airbag 4 is disposed in the central groove 5 at the lower part of the piston 2, and a third inflation passage 14 communicating with the airbag 4 is further formed in the piston body 21; one end of the third inflation passage 14 communicates with the middle part in the central groove 5 at the lower part of the piston 2, and is provided with a sealing ring 22 surface and threads. A sealing rubber is arranged around the inflation port of the airbag 4, and the sealing rubber corresponds to the sealing ring 22 surface. The inflation port of the airbag 4 is connected to the threads at the lower end of the third inflation passage 14 through a stud, so that a sealing belt is formed after the sealing rubber is pressed against the sealing ring 22 surface, preventing the oil in the piston 2 cylinder from entering the interior of the third inflation passage 14. The other end of the third inflation passage 14 communicates with the airbag 4 inflation hose 8, and the other end of the airbag 4 inflation hose 8 communicates with a second inflation port outside the accumulator cylinder body for inflating or deflating the airbag 4. The second inflation port is used for connecting to an external nitrogen filling cart.

[0047] Specifically, the second inflation port is used for connecting to an external nitrogen filling cart. The nitrogen filling cart in the field of inflation and pressurization devices is designed to improve the utilization rate of nitrogen. It is a nitrogen filling device designed for two situations: directly filling nitrogen into an accumulator or a high-pressure container from a nitrogen cylinder, or when the pressure required for nitrogen filling is higher than the air pressure in the nitrogen cylinder and direct filling cannot be carried out. The nitrogen filling cart consists of a hydraulic system, an electric circuit, a gas circuit, a nitrogen boosting device, etc. The nitrogen filling cart is equipped with a nitrogen boosting device on the cart, and ejector rods are arranged in the end covers at both ends of the cylinder body. Limit switches are arranged at both ends of the oil chamber and the gas chamber. The piston 2 pushes the electromagnetic reversing valve of the limit switch through the ejector rod to send a reversing signal, and the hydraulic system boosts the pressure, causing the piston 2 to continuously reciprocate, pressurizing the gas and inputting it into the pressure vessel until the required pressure is reached, and then automatically stopping. If it is connected to the gas circuit system of the pressure vessel, it can play the role of automatic inflation and pressure maintenance.

[0048] As a preferred embodiment, at least one oil return passage 9 is further formed in the piston body 21; a recovery check valve 10 is connected inside the oil return passage 9, and the recovery check valve 10 is used to ensure that the oil in the accumulator cylinder body does not flow back to the upper part of the piston body 21; the recovery check valve 10 has a preset back pressure, which can ensure that the oil above the piston 2 can lubricate the sealing slip ring 223 through the gap between the piston 2 and the accumulator cylinder body during the downward working state of the piston 2, without returning to the interior of the accumulator cylinder body through the oil return passage 9; the recovery check valve 10 can be opened during the upward movement of the piston body 21 along the accumulator cylinder body, so that the oil above the piston 2 can return to the interior of the accumulator cylinder body through the oil return passage 9, in order to prevent the emergence of vacuum bubbles or steam bubbles generated by the suction effect of the upward movement of the piston 2 in the accumulator cylinder body; a filter screen or filter is connected to the upper end of the oil return passage 9;

[0049] An exhaust passage is also provided inside the piston body 21, and a gas-liquid recovery annular groove is annularly provided on the inner wall surface of the central groove 5 of the piston body 21 to fully absorb the gas in the central groove 5; the exhaust passage extends in the vertical direction of the piston body 21 to the gas-liquid recovery annular groove, so that the gas-liquid recovery annular groove is communicated with the exhaust passage, and an exhaust valve is connected above the exhaust passage.

[0050] Specifically, the exhaust valve can be submerged in the oil above the piston 2. During the upward movement of the piston body 21 along the accumulator cylinder, in order to prevent the air above the piston 2 from entering the interior of the accumulator cylinder, a liquid level alarm is provided above the piston 2. When the oil level is lower than the set lower threshold, the upward movement of the piston body 21 along the accumulator cylinder is stopped to ensure that there is enough oil above the piston 2 for the suction amount during the upward movement of the piston 2, thereby isolating the air above the oil from entering the interior of the accumulator cylinder. An exhaust passage is provided inside the piston 2, and an exhaust valve is provided above the exhaust passage.

[0051] Specifically, when there is gas overflow in the system, the gas will climb upward along the pipeline and finally gather at the highest point of the system. The exhaust valve is generally installed at the highest point of the system. When the gas enters the valve cavity of the exhaust valve and gathers above the exhaust valve, as the gas in the valve increases, the pressure rises. When the gas pressure is greater than the system pressure, the gas will cause the liquid level in the cavity to drop, and the float will drop with the liquid level, opening the exhaust port; after the gas is exhausted, the liquid level rises, and the float also rises, closing the exhaust port. Similarly, when there is negative pressure in the system, the liquid level in the valve cavity drops, and the exhaust port opens. Since the external atmospheric pressure is greater than the system pressure at this time, the atmosphere will enter the system through the exhaust port to prevent the harm of negative pressure. If the valve cap on the valve body of the exhaust valve is tightened, the exhaust valve stops exhausting. Usually, the valve cap should be in the open state. The exhaust valve can also be used in combination with a cut-off valve for easy maintenance of the exhaust valve. The sealing end face part of the lever is supported by a spring and can expand and contract accordingly with the movement of the lever to ensure the sealing performance when not exhausting. When installing the exhaust valve, it is best to install it together with the cut-off valve, so that when the exhaust valve needs to be removed for maintenance, the tightness of the system can be ensured and the oil will not flow out.

[0052] Further, an oil suction filter is connected to the upper end of the oil return passage 9, and a filter screen is connected in the oil suction filter, and the mesh number of the filter screen is 80 meshes.

[0053] The oil suction filter is used to block large particle contaminants from entering the accumulator and is installed at the confluence of the upper end of the oil return passage 9 to prevent impurities or bubbles suspended in the oil from entering the accumulator. The filter should be selected with a coarse filtration accuracy and a large flow capacity, so the mesh number of the filter screen is preferably 80 meshes.

[0054] Around the lifting ring on the upper part of the piston body 21, weight fixing grooves 3 are symmetrically arranged. Weights 3 with the same weight and volume are respectively arranged in the weight fixing grooves 3 on both sides; at the upper outlet of the oil return channel 9, a liquid level alarm meter is arranged, and the alarm lower threshold set by the liquid level alarm meter is not higher than the filter screen above the oil return channel 9; in the central groove 5 of the piston body 21, a cavity facing the inside of the accumulator cylinder body is arranged. The airbag 4 is an inverted cone and is arranged in the cavity of the piston body 21 to ensure that it does not abut against the peripheral wall surface of the cavity.

[0055] As a preferred implementation manner, a piston position sensor 13 is arranged on the accumulator cylinder body; the piston position sensor 13 is arranged outside the accumulator cylinder body and does not contact the piston body 21; an induction device that is inductive to the piston position sensor 13 is arranged on the piston body 21; the piston position sensor 13 sets an alarm lower threshold and an upper threshold;

[0056] By feeding back the liquid level data measured by the liquid level alarm meter on the piston body 21 to the drive unit, the drive unit is enabled to adjust the rising speed of the piston 2 along the accumulator cylinder body, preventing the oil liquid above the piston 2 from being completely sucked in due to the piston 2 rising too fast along the accumulator cylinder body, and further preventing the air in the upper part of the accumulator cylinder body from being sucked in.

[0057] The piston position sensor 13 is preferably an external magnetic induction type sensor. A sensor that is inductive to the piston position sensor 13, such as a magnet, etc., is arranged on the piston 2. The piston 2 sensor sets an alarm lower threshold and an upper threshold. The upper threshold ensures that the piston 2 does not exceed the set highest movement position, so as to ensure that the dust cover 12, the airbag 4 inflation hose 8, etc. are not touched and damaged. On the other hand, it is ensured that the alarm upper threshold set by the liquid level alarm meter exceeds the height of the weight 3, so that the upper space between the piston 2 and the accumulator cylinder body can store the returned oil liquid without the risk of oil liquid overflowing from the second inflation port or the support tire inflation port; the piston position sensor 13 sets an alarm lower threshold to ensure that there is a certain amount of oil liquid at the bottom of the accumulator cylinder body without touching the oil inlet interface, oil drain interface or supply oil port at the lower part of the accumulator cylinder body; in order to ensure the reliability of the sensor data, a position trigger sensor above the piston 2 can be redundantly arranged, and the lower threshold can be measured and controlled by the length of the second connecting rope 65.

[0058] As a preferred implementation manner, a dust cover 12 is arranged outside the accumulator cylinder body. A sealing ring 22 or a tie is arranged at the connection between the dust cover 12 and the first connecting rope 64 to prevent dust from entering the upper part of the piston body 21 between the dust cover 12 and the first connecting rope 64; a groove or a snap ring is arranged between the dust cover 12 and the outer wall of the accumulator cylinder body for fixing the edge of the dust cover 12 to the outside of the accumulator cylinder body.

[0059] The dust cover 12 not only has the function of preventing dust, but also has the functions of waterproofing and anti-corrosion. An air filter can also be provided on the dust cover 12 to ensure that the air above the piston 2 in the accumulator cylinder body can freely circulate and be filtered.

[0060] As a preferred embodiment, a fourth air flow channel is further connected to the lower edge of the upper part of the accumulator cylinder body connected to the dust cover 12, and an air drying filter 11 is provided on the channel to ensure that the air above the piston body 21 in the accumulator cylinder body and the dust cover 12 can pass through the air drying filter 11, be filtered and dried, and then circulate, preventing water vapor from entering the upper part of the piston 2.

[0061] What is not described in this application can be realized by adopting or referring to the existing technology.

[0062] Each embodiment in this specification is described in a progressive manner. For the same or similar parts among the embodiments, reference can be made to each other. Each embodiment focuses on the differences from other embodiments.

[0063] The above are only the embodiments of this application and are not intended to limit this application. For those skilled in the art, various changes and modifications can be made to this application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the scope of the claims of this application.

Claims

1. An accumulator, characterized in that: It includes an accumulator body, a piston, a weight and an airbag; the accumulator body includes an accumulator cylinder; the lower part of the accumulator cylinder is provided with an oil inlet interface, an oil discharge interface and an oil supply port, and the upper part of the accumulator cylinder is provided with an oil recovery port; the piston, the weight and the airbag are arranged in the accumulator cylinder; the weight is arranged above the piston; the airbag is arranged in the central groove of the lower part of the piston; the piston lifting device includes a driving unit and a pulley mechanism; the driving unit is connected to the pulley mechanism, and the pulley mechanism is connected to the piston, so that when the piston, the airbag and the weight act together, the weight accumulator can achieve the function of increasing the pressure regulation reaction speed through the assistance of the airbag; or, when the driving unit, the pulley mechanism, the piston, the weight and the airbag act together, the weight accumulator can achieve the function of adjusting the output pressure through the driving unit and increasing the pressure regulation reaction speed through the assistance of the airbag; The piston includes a piston body, a sealing ring and a lifting ring; a sealing ring is arranged between the circumference of the piston body and the accumulator cylinder body, and a pressure-regulating support tire is arranged inside the sealing ring. The movement friction resistance between the piston and the accumulator cylinder body or the oil leakage of the sealing ring is controlled by adjusting the inflation pressure inside the pressure-regulating support tire; The upper part of the piston is provided with an oil storage space for leaked oil, and the stored oil can provide oil lubrication and infiltration for the sealing ring between the piston and the accumulator cylinder from the upper part, so as to reduce friction and enhance the flexibility and acceleration reaction capability of the overall up and down movement of the heavy hammer piston.

2. An accumulator according to claim 1, characterized in that: The pulley mechanism comprises a first pulley, a second pulley, a third reel, a first connecting rope and a second connecting rope; The central axis of the first pulley is connected to the lifting ring on the piston through the first connecting rope; the central axis of the second pulley is arranged above the first pulley, the second pulley is a fixed pulley, the third reel is connected to the driving unit, one end of the second connecting rope is arranged on the central axis of the second pulley or the fixed end of the second pulley, and then after passing through the first pulley and the second pulley, the other end is wound around and connected to the third reel; A clutch and a brake device are arranged between the driving unit and the third reel. The driving unit can drive the third reel to operate, so that the second connecting rope can drive the central axis of the first pulley to move up and down, thereby driving the first connecting rope and the piston to rise along the accumulator cylinder or controlling the descending speed of the piston; the driving unit and the third reel are separated or combined through the clutch; the third reel is slowed down or stopped through the brake device, thereby achieving the piston slowing down the descending speed or hovering.

3. An accumulator according to claim 2, characterized in that: The outer circumference of the piston body is provided with an annular groove, and a sealing ring is arranged in the annular groove; the top of the piston body is connected with a lifting ring for connecting with the first connecting rope; The sealing ring comprises a support ring, a pressure-regulating support tire and a sealing slip ring; the support ring comprises an upper support ring and a lower support ring; the upper support ring and the lower support ring are connected to the upper and lower sides of the annular groove; a pressure-regulating support tire is arranged in the annular groove between the support ring and the lower support ring; the sealing slip ring is arranged between the pressure-regulating support tire and the accumulator cylinder body, the upper part of the sealing slip ring is fixed by the upper support ring, and the lower part of the sealing slip ring is fixed by the lower support ring.

4. An accumulator according to claim 3, characterized in that: A first inflation channel is provided in the piston body; a second inflation channel is provided in the upper support ring; an inflation hose is arranged in the first inflation channel, one end of the inflation hose passes through the second inflation channel of the upper support ring and is connected to the pressure-regulating support tire, and the other end of the inflation hose is connected to the first inflation port outside the accumulator cylinder body, and the first inflation port is used to connect to an external inflation mechanism.

5. An accumulator as claimed in claim 3, characterized in that: An airbag is arranged in the central groove at the lower part of the piston, and a third inflation channel connected to the airbag is also opened in the piston body; one end of the third inflation channel is connected to the middle part of the central groove at the lower part of the piston, and a sealing ring surface and a thread are opened, and a sealing rubber is arranged on the circumference of the inflation port of the airbag, and the sealing rubber corresponds to the sealing ring surface, and is connected with the thread at the lower end of the third inflation channel through the stud of the airbag inflation port, so that the sealing rubber and the sealing ring surface are pressed to form a sealing belt to prevent the oil in the piston cylinder from entering the third inflation channel, and the other end of the third inflation channel is connected to the airbag inflation hose, and the other end of the airbag inflation hose is connected to the second inflation port outside the accumulator cylinder body for inflating or deflating the airbag, and the second inflation port is used to connect with an external nitrogen charging cart.

6. An accumulator as claimed in claim 3, characterized in that: At least one oil reflux channel is also provided in the piston body; a recovery check valve is connected inside the oil reflux channel, and the recovery check valve is used to ensure that the oil in the accumulator cylinder does not flow back to the top of the piston body; the recovery check valve has a preset back pressure, which can ensure that the oil above the piston can be lubricated to the sealing slip ring through the gap between the piston and the accumulator cylinder when the piston is in a downward working state, and does not return to the inside of the accumulator cylinder through the oil reflux channel; the recovery check valve can be opened during the process of the piston body rising along the accumulator cylinder, so that the oil above the piston can return to the inside of the accumulator cylinder through the oil reflux channel, so as to prevent the emergence of vacuum bubbles or steam bubbles generated by the suction effect of the piston in the accumulator cylinder; the upper end of the oil reflux channel is connected to a filter; An exhaust channel is also provided inside the piston body, and a gas-liquid recovery groove is provided in an annular shape on the inner wall surface of the central groove of the piston body to fully absorb the gas in the central groove; the exhaust channel extends to the gas-liquid recovery groove in the vertical direction of the piston body, so that the gas-liquid recovery groove is connected to the exhaust channel, and an exhaust valve is connected above the exhaust channel.

7. An accumulator according to claim 6, characterized in that: Weight fixing grooves are symmetrically arranged around the lifting ring on the upper part of the piston body, and weights of the same weight and volume are respectively arranged in the weight fixing grooves on both sides; a liquid level alarm gauge is arranged at the outlet above the oil reflux channel, and the lower alarm threshold value of the liquid level alarm gauge is not higher than the filter net above the oil reflux channel; a cavity facing the inside of the accumulator cylinder is arranged in the central groove of the piston body, and the airbag is an inverted cone and is arranged in the cavity of the piston body to ensure that it does not abut against the surrounding wall of the cavity.

8. An accumulator according to claim 7, characterized in that: A piston position sensor is arranged on the accumulator cylinder body; the piston position sensor is arranged outside the accumulator cylinder body and does not contact the piston body; a sensing device that senses the piston position sensor is arranged on the piston body; the piston position sensor is provided with an alarm lower threshold and an upper threshold; The liquid level data measured by the liquid level alarm gauge on the piston body is fed back to the drive unit, so that the drive unit can adjust the speed at which the piston rises along the accumulator cylinder to prevent the piston from rising too quickly along the accumulator cylinder, which would cause the oil on the upper part of the piston to be completely sucked in, thereby causing the air on the upper part of the accumulator cylinder to be sucked in.

9. An accumulator according to claim 1, characterized in that: A dust cover is provided on the outer wall of the accumulator cylinder body, and a sealing ring or a cable tie is provided at the connection between the dust cover and the first connecting rope to prevent dust from entering the upper part of the piston body from between the dust cover and the first connecting rope; grooves or clamping rings are provided on the outer wall of the dust cover and the accumulator cylinder body to fix the edge of the dust cover to the outside of the accumulator cylinder body.

10. An accumulator according to claim 9, characterized in that: The lower edge of the upper part of the accumulator cylinder body connected to the dust cover is also connected to a fourth air flow channel, and an air drying filter is arranged on the channel to ensure that the air above the dust cover and the piston body in the accumulator cylinder body can circulate through the air drying filter after filtering and drying, thereby preventing water vapor from entering the upper part of the piston.

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