阅读说明：本技术 一种活塞阀式蓄能器 (Piston valve type energy accumulator ) 是由 杨世祥 于 2020-05-07 设计创作，主要内容包括：本发明公开了一种活塞阀式蓄能器,包含：缸筒；活塞阀,活塞阀悬浮于缸筒内；其中缸筒被活塞阀分隔成用于容纳高压气体的上部腔室和用于容纳高压油的下部腔室；下部腔室的底部设置有连接高压气管的充气口和连接高压油管的高压油口。该活塞阀式蓄能器不使用密封圈,有效克服了因密封圈损坏导致的寿命短、活塞下沉、气体进入管路、易造成系统故障以及维修难度大等缺陷。(The invention discloses a piston valve type energy accumulator, comprising: a cylinder barrel; the piston valve is suspended in the cylinder barrel; wherein the cylinder is divided by the piston valve into an upper chamber for containing high pressure gas and a lower chamber for containing high pressure oil; the bottom of the lower cavity is provided with an inflation inlet connected with a high-pressure air pipe and a high-pressure oil port connected with a high-pressure oil pipe. The piston valve type energy accumulator does not use a sealing ring, and effectively overcomes the defects of short service life, piston sinking, gas entering a pipeline, easy system failure, high maintenance difficulty and the like caused by the damage of the sealing ring.)

1. A piston valve accumulator, comprising:

a cylinder (210);

a piston valve (220), the piston valve (220) being suspended within the cylinder (210); wherein

The cylinder (210) is divided by the piston valve (220) into an upper chamber (230) for containing high pressure gas and a lower chamber (240) for containing high pressure oil;

the bottom of the lower chamber (240) is provided with an inflation inlet (211) connected with a high-pressure air pipe (250) and a high-pressure oil port (212) connected with a high-pressure oil pipe (260).

2. A piston valve accumulator according to claim 1 characterized in that the piston valve (220) comprises a piston body (221), the piston body (221) being spaced apart from the inner wall of the cylinder (210) to form an annular seam (225).

3. A piston valve accumulator according to claim 2 characterized in that the piston body (221) comprises a base and a sidewall extending upwardly from the outer edge of the base, the base and sidewall defining a cavity towards the upper chamber (230).

4. A piston valve accumulator according to claim 3 characterized in that a washer (222) is provided on the side wall of the piston body (221), said washer (222) forming a protrusion on the outer surface of the side wall of the piston body (221) towards the inner wall of the cylinder (210).

5. The piston valve accumulator according to claim 3 or 4 characterized in that the piston valve (220) comprises a ball valve (223), the ball valve (223) is located essentially above the high pressure port (212) and connected to the bottom of the piston body (221) by a connecting member (224), and the ball valve (223) forms a sealed state when in contact with the high pressure port (212).

6. A piston valve accumulator according to claim 5 characterized in that the ball valve (223) is flexibly connected to the bottom of the piston body (221) by the connecting member (224).

7. A piston valve accumulator according to claim 1 including a sensor (270) for sensing the pressure of high pressure oil and a display device communicatively connected to the sensor (270), the display device being responsive to a pressure signal from the sensor (270) to display the level of the high pressure oil within the piston valve accumulator.

8. A piston valve accumulator according to claim 7 including an alarm means communicatively connected to the sensor (270), the alarm means being responsive to the oil pressure being less than a minimum oil pressure value above a predetermined threshold to raise an alarm.

9. A piston valve accumulator according to claim 7 characterized in that the bottom of the cylinder (210) is provided with a sensing port (213) connected to a sensing conduit (280), the sensor (270) being provided on the sensing conduit (280).

10. A piston valve accumulator according to claim 7 characterised in that the top of the cylinder barrel (210) is provided with a high pressure gas port (214), the high pressure gas port (214) being connected to a high pressure gas cylinder (291) by a connecting conduit (290).

Technical Field

The invention relates to the technical field of hydraulic pressure, in particular to a piston valve type energy accumulator.

Background

An accumulator is an energy storage device in a hydraulic system and functions to store excess energy in the system at the proper time and to release the stored energy to recharge the system when needed. The piston accumulator is one form of accumulator commonly used in the art, as shown in fig. 1-2, the cylinder 110 is divided by a piston 120 located therein into an upper chamber 130 for containing high pressure gas and a lower chamber 140 for containing high pressure oil. The top of the upper chamber 130 is provided with an inflation inlet 111 connected with a high-pressure air pipe 150, and high-pressure air in the upper chamber 130 is supplemented by adjusting an inflation valve 151 arranged on the high-pressure air pipe 150; the bottom of the lower chamber 140 is provided with a high-pressure oil port 112 connected with a high-pressure oil pipe 160, and the high-pressure oil in the lower chamber 140 is supplemented and released by adjusting a stop valve 161 arranged on the high-pressure oil pipe 160; the piston 120 completely blocks the high-pressure gas in the upper chamber 130 from the high-pressure oil in the lower chamber 140 by the sealing ring 121 which is in close contact with the inner wall of the cylinder 110. When in the first state shown in fig. 1, the piston 120 moves upwards, and the excess energy in the system is converted into the compression energy of the high-pressure gas and stored; when in the second state shown in fig. 2, the piston 120 moves down, and the compression energy of the high-pressure gas is converted into hydraulic energy to be released into the system. Based on the above structure, the conventional piston accumulator 100 has the following disadvantages:

1. the sealing ring 121 frequently rubs against the inner wall of the cylinder 110 for a long time and is easily damaged, so that the piston sinks to the bottom, and the service life of the whole energy accumulator 100 is short;

2. the compressed high-pressure gas easily enters the lower chamber 140 after the sealing ring 121 is damaged, and enters the system through the high-pressure oil pipe 160 along with the downward movement of the piston 120, so that system failure is caused;

3. the sealing ring 121 is positioned inside the cylinder barrel 110, so that on one hand, the damage state of the sealing ring cannot be found timely by workers, and on the other hand, the sealing ring cannot be replaced conveniently even if the damage state of the sealing ring is found, and the maintenance difficulty is high;

4. since the sealing ring 121 is in close contact with the cylinder 110, the friction force between the sealing ring and the inner wall of the cylinder must be overcome to move the piston 120, so that the response speed of the accumulator 110 is slow.

Therefore, how to reduce the production and maintenance costs while prolonging the service life and accelerating the reaction speed becomes an urgent technical problem to be solved in the field of energy accumulators.

Disclosure of Invention

In order to solve the technical problems in the prior art, the invention provides a piston valve type energy accumulator which has the advantages of prolonging the service life and accelerating the reaction speed.

According to the present invention, there is provided a piston valve accumulator comprising: a cylinder and a piston valve suspended in the cylinder, wherein

The cylinder barrel is divided into an upper chamber for containing high-pressure gas and a lower chamber for containing high-pressure oil by the piston valve;

the bottom of the lower cavity is provided with an inflation inlet connected with a high-pressure air pipe and a high-pressure oil port connected with a high-pressure oil pipe.

According to one embodiment of the present invention, the piston valve includes a piston body spaced apart from an inner wall of the cylinder to form a circumferential seam.

According to one embodiment of the invention, the piston body includes a bottom and a sidewall extending upwardly from an outer edge of the bottom, the bottom and sidewall defining a cavity toward the upper chamber.

According to one embodiment of the invention, the side wall of the piston body is provided with a washer, which forms a projection on the outer surface of the side wall of the piston body towards the inner wall of the cylinder.

According to one embodiment of the invention, the piston valve comprises a ball valve which is located essentially above the high-pressure port and is connected to the bottom of the piston body by a connecting member, and the ball valve forms a sealed state when in contact with the high-pressure port.

According to one embodiment of the invention, the ball valve is flexibly connected to the bottom of the piston body by means of a connecting member.

According to an embodiment of the invention, the piston valve accumulator comprises a sensor for detecting the oil pressure of the high pressure oil and a display device communicatively connected to the sensor, the display device displaying the level of the high pressure oil within the piston valve accumulator in response to a pressure signal from the sensor.

According to one embodiment of the invention, the piston valve accumulator comprises a sensor alarm device communicatively connected to the sensor, the alarm device generating an alarm in response to the oil pressure being less than a minimum oil pressure value exceeding a predetermined threshold.

According to one embodiment of the invention, the bottom of the cylinder barrel is provided with a detection port connected with a detection pipeline, and the sensor is arranged on the detection pipeline.

According to one embodiment of the invention, the top of the cylinder barrel is provided with a high-pressure gas port, which is connected to a high-pressure gas cylinder through a connecting pipe.

Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages:

1. according to the piston valve type energy accumulator, a sealing ring is not used, so that the defects of short service life, easiness in causing system failure, high maintenance difficulty and the like caused by damage of the sealing ring are effectively overcome;

2. the piston valve type energy accumulator has light weight, simple structure and low requirement on precision of components, and effectively reduces the production cost;

3. the high-pressure gas is sealed in the completely closed upper cavity by the high-pressure oil, so that the possibility of leakage of the high-pressure gas from the inflating port is fundamentally avoided;

4. the piston valve is suspended in the cylinder barrel by means of the buoyancy of high-pressure oil and can quickly move in response to the pressure difference between high-pressure gas and high-pressure oil at any time;

5. the piston valve can be of a thin-wall structure with light weight, so that materials and space are saved, and the response rate of the piston valve can be further accelerated;

6. according to the piston valve type energy accumulator, a sealing ring is not used, and a sensor and a display device which are positioned outside a cylinder barrel are included, so that a worker can monitor the liquid level height conveniently, and the piston valve type energy accumulator is convenient to maintain and replace;

7. according to the piston valve type energy accumulator, a sealing ring is not used, and an alarm device is included, so that a worker can be informed of high-pressure oil leakage in time.

Drawings

FIG. 1 shows a schematic of a prior art accumulator in a first state;

FIG. 2 shows a schematic of a prior art accumulator in a second state;

FIG. 3 shows a schematic view of an embodiment of an accumulator according to the present invention in a first state;

FIG. 4 shows a schematic view of an embodiment of an accumulator according to the present invention in a second state;

fig. 5 shows another embodiment according to the invention.

In the figure, the position of the upper end of the main shaft,

100 prior art accumulator, 110 cylinder, 111 charge port, 112 high pressure port, 120 piston, 121 gasket, 130 upper chamber, 140 lower chamber, 150 high pressure gas pipe, 151 charge valve, 160 high pressure gas pipe, 161 stop valve, 200 accumulator according to the present invention, 210 cylinder, 211 charge port, 212 high pressure port, 213 detection port, 214 high pressure gas port, 220 piston valve, 221, 222 gasket, 223 ball valve, 224 connection part, 225 circumferential seam, 230 upper chamber, 240 lower chamber, 250 high pressure gas pipe, 251 charge valve, 260 high pressure gas pipe, 261 stop valve, 270 sensor, 280 detection pipe, 281 detection valve, 290 connection pipe, 291 high pressure gas cylinder.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 2-3, one embodiment 200 of a piston valve accumulator in accordance with the present invention generally comprises a cylinder 210 and a piston valve 220 suspended within the cylinder 210. Specifically, the space inside the cylinder 210 is divided by the piston valve 220 into an upper chamber 230 and a lower chamber 240, wherein the upper chamber 230 is used to contain high-pressure gas having a relatively small mass, and the lower chamber 240 is used to contain high-pressure oil having a relatively large mass, and the piston valve 220 is suspended in the cylinder 210 by the buoyancy of the high-pressure oil and moves up and down according to changes in the gas pressure and the oil pressure. An inflation port 211 connected to the high pressure air pipe 250 and a high pressure oil port 212 connected to the high pressure oil pipe 260 are provided at the bottom of the lower chamber 240. The high pressure gas pipe 250 is provided with an inflation valve 250, the inflation valve 250 is opened to inflate the inside of the cylinder 210, and the high pressure gas automatically rises to the upper chamber 230 at the upper part of the cylinder 210 due to the small mass. The high pressure oil pipe 260 is provided with a cut-off valve 261, and the cut-off valve 261 is opened to supplement and discharge high pressure oil, which is deposited in the lower chamber 240 of the lower portion of the cylinder 210 due to its large mass. When in the first state shown in fig. 3, the excess energy in the system increases the pressure of the high-pressure oil, pushing the piston valve 220 to move upwards, and converting the hydraulic energy into the compression energy of the high-pressure gas for storage; when in the second state shown in fig. 4, the high-pressure gas pushes the piston valve 220 downward, and the compression energy of the high-pressure gas is converted into hydraulic energy to be released into the system. When the piston valve 220 is lowered to contact with the bottom of the cylinder 210, the high-pressure oil port 212 at the bottom is also sealed, so that a small amount of high-pressure oil remaining in the cylinder 210 does not flow out any more, and the high-pressure gas sealed in the cylinder 210 by the remaining high-pressure oil cannot flow out. Based on the above structure, on one hand, since the piston valve 220 is suspended within the cylinder 210 without contacting the inner wall of the cylinder, the piston valve 220 can be rapidly moved in response to the pressure difference of both the high-pressure gas and the high-pressure oil; on the other hand, the charging port 211 is disposed at the bottom of the lower chamber 240, and the high-pressure oil seals the high-pressure gas at the upper portion, so that the upper chamber 230 containing the high-pressure gas integrally forms a completely closed space, thereby fundamentally preventing the high-pressure gas from leaking from the charging port. Further, compared with the piston type accumulator 100, the piston valve type accumulator 200 completely gets rid of the use of the sealing ring 121, so that the defects of short service life, easy system failure, high maintenance difficulty and the like caused by the damage of the sealing ring 121 are overcome.

In one embodiment of the present invention, the piston valve 220 may include a piston body 221, the piston body 221 and the inner wall of the cylinder 210 being spaced apart from each other to form an annular gap 225, so that the high-pressure gas and the high-pressure oil contact each other in the fine annular gap 225. In this manner, the piston valve 220 is suspended within the cylinder 210. Since the piston valve 220 can rapidly move in response to the pressure difference between the high-pressure gas and the high-pressure oil at any time, it is not necessary to overcome the friction force between the seal ring 121 and the inner wall of the cylinder tube 110 compared to the piston 120 in the piston accumulator 100, so that the pressure required to be applied to the piston valve 220 is significantly reduced. Thus, the piston valve 220 of the present application may have a thin-walled structure with a low mass. For example, the piston body 221 can include a bottom and a sidewall extending upward from an outer edge of the bottom such that the bottom and sidewall define a cavity toward the upper chamber 230. Which may be part of the upper chamber 230 to contain high pressure gas. By adopting the piston body 221, on one hand, the thin-wall structure only needs to occupy a smaller space in the cylinder barrel 210, and on the other hand, the mass is reduced, so that the reaction is more sensitive after the piston body is pressed. To avoid high pressure oil entering the cavity during the movement of the piston valve 220, various measures may be taken, such as: the sidewall of the piston body 221 is designed to have a sufficient height to prevent high pressure oil from entering the cavity beyond the sidewall; or an inverted funnel-shaped cover is arranged above the cavity, and the inclined surface of the funnel is used for blocking hydraulic oil from entering the cavity and simultaneously allowing high-pressure gas to enter the cavity through the mouth of the funnel.

Preferably, a washer 222 may be provided on the sidewall of the piston body 221, and the washer 222 may form a protrusion toward the inner wall of the cylinder 210 on the outer surface of the sidewall of the piston body 221. Unlike the seal ring 121 of the piston accumulator 100, the washer 222 of the present invention is disposed not to contact the inner wall of the cylinder 210 or to have only a slight contact with the inner wall of the cylinder 210, and functions to prevent the piston body 221 from colliding with or wearing the cylinder 210, while the frictional force generated between the washer 222 and the cylinder 210 when the piston valve 220 moves up and down is almost negligible.

In yet another embodiment of the present invention, the piston valve 220 may further comprise a ball valve 223. The ball valve 223 is located substantially above the high pressure oil port 212 and may be connected to the bottom of the piston body 221 by a connecting member 224. The ball valve 223 functions to come into sealing contact with the high-pressure oil port 212 when the piston valve 220 is moved down to a certain height, so as to prevent the high-pressure oil from flowing out continuously. In the present embodiment, the ball valve 223 is designed in a ball shape, and accordingly, the upper portion of the high-pressure oil port 212 is designed in an inverted cone shape. Alternatively, the ball valve 223 and the upper portion of the high pressure oil port 212 may be designed in other shapes. The connection between the ball valve 223 and the bottom of the piston body 221 may be a rigid connection or a flexible connection. The rigid connection is beneficial to the piston valve 220 to be integrally formed by using the same material, but the requirement on the position accuracy of the ball valve 223 is high, and the ball valve needs to be strictly positioned above the high-pressure oil port 212 to ensure the sealing performance; the flexible connection allows the ball valve 223 to be biased to a suitable range, only substantially above the high pressure port 212.

In a preferred embodiment of the present invention, piston valve accumulator 200 may include a sensor 270 for sensing the pressure of high pressure oil and a display device (not shown) communicatively coupled to sensor 270. The display device may display the level of high pressure oil within piston valve accumulator 200 in response to the oil pressure signal from sensor 270. Specifically, with the piston valve 220 stable:

P1*V1＝P2*V2 (1)

V1＝L1*S1 (2)

V2＝L2*S2 (3)

wherein the content of the first and second substances,

p1 is the pressure value of the high-pressure gas;

v1 is the volume of the upper chamber 230, i.e. the volume of high pressure gas;

p2 is the oil pressure value of high-pressure oil;

v2 is the volume of lower chamber 240, i.e., the volume of high pressure oil;

l1 is the distance from the top inner surface of the cylinder 210 to the upper surface of the piston valve 220, i.e., the height of the high pressure gas;

s1 is the area of the upper surface of the piston valve 220;

l2 is the distance from the inner surface of the bottom of the cylinder barrel to the lower surface of the piston valve 220, namely the height of the liquid level of high-pressure oil;

s2 is the area of the lower surface of the piston valve 220.

Since the areas of the upper and lower surfaces of the piston valve 220 are equal, i.e., S1 — S2, the above formula can be simplified as follows:

P1*L1＝P2*L2 (4)

when the gas is in an equilibrium state, the gas pressure and the volume satisfy a gas state equation:

PV＝nRT (5)

wherein the content of the first and second substances,

n is the number of moles of gas, since the upper chamber 230 is a completely closed chamber, n of the high pressure gas is a constant value;

r is a thermodynamic constant, and for a given gas, the value of R is constant;

t is thermodynamic temperature, and in a normal-temperature working environment, the temperature change is extremely small and can be ignored, namely the thermodynamic temperature T can be regarded as a fixed value.

Substituting equation (5) into equations (3) and (4) yields:

for a given piston valve accumulator 200, the area S2 of the lower surface of the piston valve 220 is constant, and thus,

wherein K is a fixed value. Substituting equation (7) into equation (4) may:

K＝P1*L1 (8)

when the piston valve type accumulator 200 is in the second state, the air pressure value P1 is the original state inflation pressure P1origin of the high-pressure gas, the height L of the high-pressure gas is obtained by subtracting the minimum liquid level height L min from the total height L of the inner cavity of the piston valve type accumulator 200, and since the original state inflation pressure P1origin, the total height L of the inner cavity and the minimum liquid level height L min are all known parameters of the factory design of the piston valve type accumulator 200, a worker can calculate the K value accordingly.

The liquid level height L2 min of the high-pressure oil in any state can be calculated through the K value and the oil pressure value P2 represented by the oil pressure signal and displayed on a display device, an operator can detect the instant liquid level height L2 of the high-pressure oil at any time, when the liquid level height L2 min is smaller than the minimum liquid level height L2 min and exceeds a preset threshold value delta L, the high-pressure oil is judged to leak out and corresponding remedial measures are taken, wherein the preset threshold value delta L is a value which is larger than or equal to zero and indicates that the instant liquid level height L2 is allowed to be smaller than the maximum value of the minimum liquid level height L2 min within a reasonable range under the condition of reference temperature, impurities, errors and other external factors.

The oil pressure sensor 270 may be provided on a sensing pipe 280 outside the cylinder 210, and the sensing pipe 280 communicates with the high-pressure oil through a sensing port 213 provided at the bottom of the cylinder 210. Further, a check valve 281 may be further provided on the check pipe 280 to control the flow of the high pressure oil in the check pipe 280. Because the sensor 270 is located outside of the cylinder 210, maintenance and replacement is facilitated as compared to the prior art in which a level sensor is located within the cylinder 210.

In a further preferred embodiment, the piston valve accumulator 200 may further comprise an alarm device (not shown) communicatively connected to the sensor 270, the alarm device being operable to issue an alarm in response to the oil pressure detected by the sensor 270 being less than the minimum oil pressure value P2min, i.e. the oil pressure value P2 when the piston valve accumulator 200 is in the second state, exceeding a predetermined threshold value Δ P to inform the staff that high pressure oil may leak out in order for it to take appropriate remedial action in time, wherein the predetermined threshold value Δ L is a value greater than or equal to zero, which indicates that the allowable oil pressure value P2 is less than the maximum value of the minimum oil pressure value P2min within a reasonable range in case of reference to external factors such as temperature, impurities, errors, etc.

In another preferred embodiment of the present invention, as shown in fig. 5, a high pressure gas port 214 may be provided at the top of the cylinder 210, and the high pressure gas port 214 is connected to a high pressure gas cylinder 291 for storing high pressure gas through a connection pipe 290. Thus, the volume of upper chamber 230 may be increased by externally connecting high pressure cylinder 291, thereby enabling the energy storage capacity of piston valve accumulator 200. Further, the energy storage capacity of the piston valve accumulator 200 can be varied by externally connecting high pressure gas cylinders 291 with different volumes.

The above examples only express embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.