CN111237286A - An isolated fluid pressure conversion device in which a hydraulic bladder and a piston are linked - Google Patents

Abstract

The invention discloses a fluid pressure conversion device, which comprises a cylinder body (1), a piston (2) and a hydraulic bag (3), wherein the hydraulic bag (3) is a pressure-bearing tensile tubular soft bag capable of expanding and contracting, and is arranged in the cylinder body (1), bag nozzles (32) at two ends are embedded into mounting holes in the centers of the piston (2) and a cylinder cover (12) and are tightly connected, and a space in a cylinder barrel (11) is isolated into a bag inner cavity (4) and a bag outer cavity (5) by the bag body (31), so that two different fluids are respectively contained, and channels for the fluid media to enter and exit are respectively arranged. When the pressure-adjustable fluid pressure-adjustable valve works, the pressure or the volume of fluid in one cavity is actively changed, namely the pressure or the volume of fluid in the other cavity is correspondingly changed through the combined action of expansion, contraction and extension of the bag body (31) and sliding of the piston (2), and the pressure change in the bag inner cavity (4) is larger than that in the bag outer cavity (5), and the volume change is small. The device can be used for pressurization transmission, material pumping, pipeline pressure regulation and the like.

Description

An isolated fluid pressure conversion device in which a hydraulic bladder and a piston are linked

technical field

The invention relates to the technical field of hydraulic, pneumatic and variable volume fluid pumps, in particular to an isolated fluid pressure conversion device in which a hydraulic bladder and a piston are linked.

Background technique

In many industrial scenarios involving fluid pressure transmission or fluid material transportation, technologies and equipment for driving one fluid with pressure energy to another fluid have been widely used. Typical applications include:

1. Booster transmission, such as gas-liquid booster cylinder in hydraulic machinery, hydraulic water expander for rock mining or internal pressure forming processing, etc.;

2. Pumping and lifting, such as oil extraction, the use of hydraulic pressure to pump oil in the mining industry, or the discharge of mud from the well to the ground;

3. Pressure filtration osmosis, such as using seawater pressure to pressurize the filtered water for reverse osmosis to remove salt in seawater desalination;

4. Energy storage compensation, such as compressed air bladder type, piston type accumulator, pressure compensator, etc.;

5. Compression phase change, such as LNG, liquid _CO2 compression preparation, pressure exchange refrigeration compressor, etc.

These devices are essentially fluid pressure conversion devices, and there is a process of one-way or mutual transfer of pressure energy between different fluids during operation. Users usually expect that the equipment can provide a large conversion pressure difference, generate less energy loss, and ensure that the pressure medium and the material fluid are strictly isolated without contaminating each other. In the prior art, there are usually two ways to achieve isolated fluid pressure conversion. One is to use piston groups with different diameters. The advantage is that it can achieve higher boost multiples and output pressures. For example, there are many manufacturers at home and abroad. Gas-liquid booster cylinder with 100-megapascal output. However, the multi-piston structure increases the inertia of the moving parts and the friction with the cylinder wall, resulting in slow response and increased energy consumption, and the sliding gap between the piston and the cylinder makes it difficult to avoid media mixing. The second is diaphragm pumps, bellows pumps, bladder-type accumulators, etc., which use membrane and bladder-type flexible parts. The advantage is that they can achieve strict isolation between different media. It is difficult to adapt to the high internal and external pressure difference. At present, such equipment with working pressure above ten MPa is extremely rare.

In the domestic patent document CN 110566533 A, the inventor has disclosed a tubular hydraulic bladder and a pressure generating device. The "tubular hydraulic bladder" provided in the technical solution has a bladder wall made of elastic synthetic rubber sandwiched with a reinforcing layer, which enhances the The layer is made of high-strength and high-modulus fiber bundles such as para-aramid and ultra-high-molecular-weight polyethylene. The combined advantages of general membrane bladders and hydraulic hoses.

Through product measurement and practical inspection, we have proved that this tubular hydraulic bladder has the following advantages: First, high pressure bearing, the bladder body can reliably seal and bear pressure against water, oil and gas, and the minimum burst pressure in free state can reach 70MPa The above; the second is high tensile strength, the capsule itself and the connection with the capsule nozzles at both ends can withstand a tensile force of several tons or even tens of tons (depending on the model); The third is high expansion and contraction ratio, the same capsule is expanded to Compared with the two states when stretched to the thinnest and longest, the diameter changes are more than 3 times, the length changes are more than 1.6 times, and the volume changes in the capsule are more than 5 times. In addition, it also has some advantages common to general flexible devices, such as light weight, low cost, good durability and so on. To sum up, the emergence of such new technology products provides feasible new ideas for the technical improvement of isolated fluid pressure conversion devices.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a fluid pressure conversion device to solve the problems of incomplete medium isolation, large energy loss, and heavy equipment when realizing the pressure conversion of two fluid media in the prior art. The device is not only suitable for pressurized transmission of hydraulic and pneumatic mechanical equipment, but also for material pumping or pressure regulation equipment in high-pressure fluid conveying pipelines, such as: booster, booster pump, compressor or accumulator Wait.

For achieving the above object, the present invention provides the following scheme:

The invention provides an isolated fluid pressure conversion device in which a hydraulic bladder and a piston are linked, and its structure mainly includes a cylinder, a piston and a hydraulic bladder. The cylinder body is a rigid shell, including a cylinder barrel and a cylinder cover installed at its end; the piston is an armless piston whose diameter is adapted to the cylinder barrel, and is installed in the cylinder barrel in a sliding manner. The center of the cylinder head and the piston body There are installation holes through the axial direction; the hydraulic bladder is composed of a bladder body and a bladder nozzle. The bladder body is a tubular soft bladder that can withstand compression and tension. Its inner and outer layers are elastic synthetic rubber impermeability layers. It is a reinforcing layer made of synthetic fiber bundles or thin steel wires obliquely cross-braided and wound. Its diameter and length can be expanded, contracted and stretched within a certain range with the change of the internal and external pressure difference and the force on both ends; the bag nozzle is installed The metal connector at the end of the bag body is used to lock and seal the bag mouth and to assemble and connect with other components.

The hydraulic bag is arranged between the cylinder cover and the piston in the cylinder, and the nozzles at both ends of the hydraulic bag are respectively embedded in the installation holes at the center of the cylinder cover and the piston to form a tight and sealed connection; the bladder connects the piston in the cylinder to the cylinder. The cylindrical space between the covers is isolated into two chambers, the inner cavity of the capsule and the outer cavity of the capsule, which are respectively used for accommodating two media of the first fluid and the second fluid. When working, as long as the pressure or volume of the fluid in any one of the chambers is actively changed, the two fluids interact with each other through the combined action of the expansion, contraction and stretching of the bladder and the sliding of the piston to make the pressure or volume of the fluid in the other chamber. Corresponding passive changes occur, and the variation of the fluid pressure in the bladder cavity is greater than the variation of the fluid pressure in the outer bladder cavity, and the variation of the volume of the outer bladder cavity is greater than the variation of the volume of the bladder cavity.

Working principle: For ease of description, fluid A and fluid B are used below to refer to the first fluid in the inner cavity of the capsule and the second fluid in the outer cavity of the capsule, respectively. When the bladder and the piston in the cylinder are temporarily in a static equilibrium state, the pressure P _A of the fluid A is greater than the pressure P _B of the fluid B. The reason is that the fluid B in the outer cavity of the bladder obeys Pascal's law, except that the fluid B directly passes through it. The flexible bladder wall transfers its pressure to the fluid A equally, and also acts on the inner wall of the cylinder and the inner end face of the piston at the same time, pushing the piston to slide away from the piston, and stretching the bladder body. The oblique helical structure of the reinforcing layer fibers in the body will convert the axial tensile force into radial compression force, further compress the fluid A in the bladder, and generate an additional increased pressure difference P _C , that is, P _A =P _B +P _C =P _B (1+k), where k is always a positive value, its size is proportional to the area of the annular end face inside the piston, and is positively related to the stretching and elongation of the capsule. Dynamically, there are two reciprocal ways for the exchange of pressure between the two fluids: the first way, when fluid B is actively injected from the outside of the cylinder into the outer cavity of the capsule, its pressure acts on the outer wall of the capsule and the ring of the piston at the same time. On the side, push the piston to slide away from the cylinder head side, the bladder body increases in length and becomes thinner due to the circumferential extrusion of the fluid B and the tensile force of the piston at the same time, the volume of the bladder cavity is reduced, and the pressure of the fluid A increases. Increase, output through the capsule nozzle. This process is a pressurization process in which a low-pressure, large-suction-displacement fluid drives a high-pressure, small-suction-displacement fluid. Method 2: When the fluid A is actively pressurized and injected into the inner cavity of the capsule from the outside of the capsule nozzle, the capsule body is correspondingly expanded and deformed, that is, the expansion becomes thicker and the length is shortened, the traction piston slides to the side of the cylinder head, and the space of the outer cavity of the capsule is blocked by the capsule body and the piston. The co-compression reduces the volume, and the fluid B in the outer cavity of the bladder is forced out of the cylinder. It can be seen that this process is a pumping process in which high pressure and small suction and displacement drive low pressure and large suction and displacement. In short, for forward use, the large flow outside the capsule drives the small flow in the capsule to increase the pressure; conversely, for reverse use, the high pressure in the capsule drives the low pressure in the capsule to increase the flow, which is obviously related to energy. Consistent with the law of conservation. In practical application, the device is connected with the external pipeline system, and under the control of the corresponding switching valve, the above two processes can work continuously and alternately.

Preferably, the installation of the cylinder head at the end of the cylinder barrel can be performed by flange bolts or screw threads, and the sealing effect can be achieved by adding sealing washers or precision machining.

Preferably, the locking and sealing method for inserting and connecting the capsule nozzle in the cylinder head or the piston installation hole is any one or two of the three methods of step hole matching, taper hole matching or internal threaded hole matching.

Preferably, according to actual application requirements, the channel for fluid A to enter and exit the inner cavity of the bladder can be set on a bladder nozzle in the cylinder head or the piston installation hole, or the dedicated channels for fluid A to be injected and output can be set on two sides of the bladder respectively. on the end of the bag.

Preferably, the outer cavity of the bladder is provided with at least one channel for entering and exiting the fluid B on the cylinder barrel or the cylinder cover, and the injection port and the output port of the fluid B can also be separated on the cylinder barrel or the cylinder cover according to actual application requirements. set up.

Preferably, the mounting holes at the center of the cylinder head and the piston are provided with threads for mounting the valve member, the connecting member or the sealing member.

Preferably, among the two fluids that undergo pressure conversion, the driving medium whose pressure is actively changed is any one of water, pressure liquid or compressed gas, and the driven fluid is gaseous, liquid, solid-liquid mixed slurry or gas-liquid phase Any kind of perversion.

Further, a cylinder cover can be installed on both ends of the cylinder, and the piston is placed therebetween, and the interior of the cylinder is divided into two cylinder chambers, left and right, and the two cylinder chambers have their own fluid B on the cylinder. incoming and outgoing ports. A hydraulic bladder is installed between the left and right sides of the piston and the two cylinder heads, which is an expansion structure of double hydraulic bladders. Working principle: Under the control of the external reversing valve, when the fluid B is pressurized and injected into the outer cavity of the left bladder, the compression piston slides to the right, the left bladder is elongated and thinned, and the contained fluid A is increased. The pressure is discharged through the left end capsule nozzle. At the same time, the right bladder shortens and expands, its inner cavity volume expands, and the fluid A flows in through the bladder nozzle at the right cylinder head, and the fluid B in the outer cavity of the right bladder returns to the outside of the cylinder. In this way, the left and right are alternately cycled, the two sides of the capsules push and pull each other through the middle piston, and the expansion and contraction help each other, which can not only realize double-acting continuous pressurization, but also make full use of the remaining pressure energy to save power consumption.

The present invention discloses the following technical effects:

Compared with this type of equipment under the prior art, the isolated fluid pressure conversion device of the hydraulic bladder and the piston linkage provided by the present invention has at least one of the following advantages:

1. The hydraulic bladder can reliably isolate the two fluid media with large pressure difference strictly, which can effectively avoid the mixed pollution between different media;

2. The flexible linkage structure of the retractable hydraulic bladder and a single piston can significantly reduce the energy consumption caused by friction and vibration, and improve the energy conversion efficiency;

3. The layered structure of inner softness and outer rigidity enables the hydraulic bladder and the cylinder body to share the internal high pressure load, which can greatly reduce the pressure bearing burden of the cylinder body, which is beneficial to reduce the weight of the equipment and the manufacturing cost;

4. The device has good versatility and a wide range of pressure adaptation, and is suitable for various fluids such as water, oil, and gas.

5. The device has a concise and compact structure, low manufacturing process difficulty, cost saving and easy assembly and maintenance.

In addition to the above enumeration, the technical effects of the present invention still have other direct or indirect descriptions in the specification.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings required in the embodiments will be briefly introduced below. Obviously, the following drawings only describe a part of the embodiments of the present invention. , for those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative labor.

Fig. 1 is the structural schematic diagram of the fluid pressure exchange device of the present invention;

Fig. 2 is the schematic diagram of the connection mode of the bag nozzle, the cylinder head and the piston in the fluid pressure exchange device of the present invention;

3 and 4 are schematic diagrams of the working principle and process of the pressurized transmission of the fluid pressure exchange device of the present invention;

5 and 6 are schematic diagrams of the working principle and process of the compression pumping of the fluid pressure exchange device of the present invention;

FIG. 7 is a schematic diagram of the dual-capsule structure and application mode of the fluid pressure exchange device of the present invention.

Among them, the cylinder body 1, the cylinder barrel 11, the cylinder head 12, the piston 2, the mounting hole 21, the blind plug seal 23, the hydraulic bladder 3, the bladder body 31, the bladder nozzle 32, the bladder nozzle through hole 33, the bladder cavity 4, The outer cavity 5 of the capsule is filled with the check valve 71 , the output check valve 72 , and the reversing valve 8 .

Detailed ways

The technical solutions in the embodiments of the present invention will be described more clearly and in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Figure 1 is a schematic structural diagram of an isolated fluid pressure conversion device in which a hydraulic bladder and a piston are linked by the present invention. As shown in Figure 1, the device includes a cylinder 1, a piston 2, and a hydraulic bladder 3. The cylinder body 1 is a rigid shell, and includes a cylinder tube 11 with a cylindrical chamber inside and a cylinder head 12 installed at its end. The center of the cylinder head 12 has a longitudinally penetrating installation hole; the piston 2 is installed in the The sealable sliding piston in the cylinder 11 and its diameter is adapted to it, and the center is also provided with an axially penetrating mounting hole 21; the hydraulic bladder 3 is composed of a flexible tubular bladder 31 and bladder nozzles 32 at both ends. The body 31 is a compressive and tensile tubular soft bag, the inner layer and the outer layer are high-elastic synthetic rubber impermeability layers, and the middle layer is a reinforcing layer made of thin steel wire or synthetic fiber bundles obliquely cross-wound and woven. Its diameter and length can be expanded, contracted and stretched within a certain range with the change of internal and external pressure difference and the force on both ends. The bag mouth 32 is a metal piece assembled on the end of the bag body 31 for sealing and locking the bag mouth and connecting with other components, and a through hole 33 is provided in the center thereof. (Refer to the domestic patent document CN 110566533 A for a more detailed understanding of the technical details of the hydraulic bladder. The scope of the "hydraulic bladder" described in the claims and description of the present invention includes the "tubular hydraulic bladder" described in this document. , but should not be construed as limited to this one.) The hydraulic bladder 3 is arranged between the cylinder cover 12 and the piston 2 in the cylinder barrel 11, and the bladder nozzles 32 at both ends are embedded in the cylinder head 23 and the center of the piston 3 respectively. In hole 21, seal and lock with a nut. The bladder body 31 of the hydraulic bladder separates the cylindrical space in the cylinder 11 into two pressure-bearing chambers, the inner chamber 4 and the outer chamber 5 of the bladder, respectively accommodating two different fluids, fluid A and fluid B.

Figure 2 depicts three optional embedded locking and sealing methods when the hydraulic bladder 3 is connected to the cylinder head and the piston through the bladder nozzle 32 in the present invention, which are stepped hole matching, taper hole matching or internal threaded hole matching. .

Embodiment 1, Figures 3 and 4 describe a connection method and working process when the fluid pressure conversion device provided by the present invention is used for oil-water booster transmission. As shown in Figures 3 and 4, the hydraulic station is used as an external pressure source device, and its oil supply pipe and oil return pipe are connected to the port 14 of the outer chamber 5 on the cylinder block through the reversing valve 8 through a hydraulic pipe. The station switching of valve 8 can realize the alternation of oil delivery and oil return process; the low-pressure water pump is an external front-end equipment used to supply water to the inner cavity 4 of the bladder, usually a servo pressurized pipeline pump, which passes through a low-pressure water pipe and passes through the pump. The injection check valve 71 installed in the outer mounting hole of the piston 2 is connected to the bladder cavity 4; the output check valve 72 is installed in the outer mounting hole of the cylinder head 12, and its function is to prevent the output high-pressure water from flowing back into the bladder. A high pressure pipe is connected to the high pressure water expander. Each working cycle includes two alternating processes of water replenishment and pressurization:

The water replenishment process is shown in Figure 3. When the reversing valve 8 is switched to the ON position of the oil return pipe, the oil supply pipe is cut off, the hydraulic station enters the standby state, and the low-pressure water pump starts to supply water. When the water pressure reaches the positive point of the injection check valve 71 When the opening pressure reaches the opening pressure, water starts to be injected into the bladder cavity 4 through the low-pressure hose, and the water injection pressure acts on the inner wall of the bladder, forcing the bladder body 31 to expand radially and thicken, and the axial length shrinks, pulling the piston 2 to the side close to the cylinder head 12. Sliding, because the outer chamber 5 of the bag is in the low-pressure oil return state that is directly connected with the oil storage tank pipeline of the hydraulic station, the combined action of the expansion of the bag 31 and the compression of the piston 2 reduces the volume of the outer chamber 5, which is quite The water injection pressure promotes the accelerated discharge of hydraulic oil from the cylinder and returns to the oil tank. When the bladder is fully filled with water, and the internal and external water pressures reach a balanced state under low pressure, the injection check valve 71 is closed, the pressure at the outlet of the low-pressure water pump will rise to the set upper limit water pressure, and it will automatically enter the standby state of suspending water supply. The system goes into the boosting process.

The pressurization process is shown in Figure 4. When the reversing valve 8 is switched to the conduction position of the oil supply pipe, the oil return pipe is cut off, and the hydraulic station begins to inject hydraulic oil into the outer cavity 5 of the bag. The bladder wall pressurizes the water filling the bladder cavity 4 and pushes the piston 2 to slide away from the cylinder head 12 at the same time. The volume of the water is reduced, and the internal water pressure is further increased. Since the water injection passage is blocked by the injection check valve 71 in the opposite direction, the high pressure water can only be output from the output check valve through the high pressure pipe to drive the water expander to do work. When the water in the cavity 4 of the bladder is emptied or the internal and external water pressure reaches the equilibrium state under high pressure, the oil pressure at the outlet of the hydraulic station will rise to the set upper limit oil pressure, and it will automatically enter the standby state of suspending oil supply, and the system will switch to water supply. process. In the above process, the station switching of the reversing valve can be automatically controlled by the standby signal of the low-pressure water pump and the hydraulic station, or it can be manually controlled as required.

This embodiment is an application method of driving another low-pressure fluid to high pressure by driving with medium-pressure fluid. For example, the 31.5MPa pressure fluid provided by the hydraulic station can pressurize the low-pressure water not higher than 1.6MPa to 70MPa The above high-pressure water is used to drive the mechanical equipment of water pressure to do work. A feature that needs special attention is that even if the water pressure in the bladder is pressurized to more than 70MPa, or even higher, the bladder bears the internal and external pressure difference of about 40MPa, and the oil pressure directly acting on the inner wall of the cylinder is always constant. It will exceed 31.5MPa, which means that the cylinder body of this booster equipment can be designed and manufactured according to the industrial standard of general-purpose hydraulic cylinders, without the need to specially increase the pressure level, which is obviously beneficial to save costs for users.

In practical applications, besides water, the pressurized medium can also be mixed slurry such as paint and coating, and the driven actuator can also be a grouting machine, a spraying machine, etc., in addition to a high-pressure water expander.

Embodiment 2, Figures 5 and 6 describe an assembly method and working process when the fluid pressure conversion device provided by the present invention is used for gas compression pumping. As shown in Figures 5 and 6, the hydraulic station is used as an external power equipment, and its oil supply pipe and oil return pipe are connected to the common oil inlet and outlet ports on the cylinder head opened in the bladder cavity 4 through a hydraulic pipe through the reversing valve 8 , a blind plug seal 23 is installed in the installation hole on the outside of the piston 2; the outer cavity 5 of the bladder is provided with two ports for injection and output on the cylinder, and an injection check valve 71 and an output check valve 72 are respectively installed, and Connect to the external low-pressure gas source and high-pressure storage tank through pressure pipes. Each working cycle includes two alternating processes of inflation and extrusion:

The inflation process is shown in Figure 5. When the reversing valve 8 is switched to the ON position of the oil return pipe, the oil supply pipe is cut off, and the hydraulic station enters the standby state. After abruptly lowering, due to the internal pressure loss of the bladder, the expansion pressure of the gas in the outer chamber 5 of the bladder changes from thick to thin, relaxes the pulling force on the piston, so that the piston is pushed by the air pressure to the side away from the cylinder head 12 to slide, and the outer chamber 5 of the bladder slides away from the cylinder head 12. When the internal air pressure drops below the pressure of the external air source, the external air is opened and injected into the one-way valve and filled into the outer chamber 5 of the bag, and the air pressure continues to push the piston to stretch the bag body to the longest and thinnest, and most of the The hydraulic oil is accelerated back to the oil tank of the hydraulic station, at this time the outer cavity of the bag reaches the maximum volume and is filled with gas that has not been further compressed.

The compression process is shown in Figure 6. When the reversing valve 8 is switched to the conduction position of the oil supply pipe, the oil return pipe is cut off, and the hydraulic station starts to inject hydraulic oil into the cavity 4 of the bladder. When the amount increases, the pressure rises, and the oil pressure acts on the inner wall of the bladder, forcing the bladder 31 to expand radially and thicken, and shrink its axial length, pulling the piston 2 to slide toward the cylinder head 12 with a huge pulling force, and the bladder expands and the piston compresses. The double action of the gas reduces the volume of the outer cavity 5 by a dozen times, the gas inside is compressed and the density increases and the pressure rises, and is transported to the high-pressure storage tank through the output check valve. In the above process, the station switching of the reversing valve 8 and the start and stop of the hydraulic station can be controlled by adding sensors to detect the signals that the piston reaches the farthest and nearest positions.

This embodiment is an application method in which a small flow of high-pressure fluid drives a large flow of low-pressure fluid to compress and pump. It is further compressed and pressurized to more than 8MPa, so that it exceeds the liquefaction critical pressure for liquefaction, refrigeration or tank storage and transportation.

In practical applications, the driving fluid medium is not limited to hydraulic oil, but also water or emulsion according to actual needs; the fluid to be pressurized is not limited to gas, but can also be liquid or viscous flow material.

Embodiment 3, a double hydraulic bladder expansion structure of the fluid pressure conversion device of the present invention is described in FIG. 7. As shown in FIG. 7, a cylinder head 12 is installed at each end of the cylinder 11, and the piston 2 is placed therebetween, and the The inside of the cylinder block 1 is divided into left and right cylinder chambers, and the left and right cylinder chambers have their respective ports 14 for fluid in and out on the cylinder block 1 . A hydraulic bladder 3 is installed between the left and right sides of the piston 2 and the two cylinder heads 12. The outlets of the bladder nozzles 32 of the left and right hydraulic bladders installed on the piston are blocked. There is a common port for injection and output.

Figure 7 also describes a matching method and working principle when applying this dual hydraulic bladder expansion structure for oil-water booster transmission. As shown in Figure 7, the oil supply pipe and oil return pipe of the hydraulic station pass through a two-position four-way reversing valve 8, and then are connected to the left and right ports 14 on the cylinder block 1 through two hydraulic pipes respectively. The reversing valve 8. Switching between the two stations can make the outer cavity 5 in the left and right cylinder chambers synchronously and alternately switch between the two processes of oil injection and oil return; the low-pressure water pump is also connected in series with two one-way valves through two water supply pipes. 71 and 72 are connected to the water expander, and a high-pressure water pipe is branched between the injection check valve 71 and the output check valve 72 on the left and right roads, respectively, and connected to the inlet and outlet ports of the bladder cavity 4 on the left and right cylinder heads 11 respectively. . Four one-way valves divide the left and right water circuits into three sections. Before the injection into the one-way valve 71 is the low-pressure water supply pipeline, after the output one-way valve 72 is the high-pressure water supply pipeline, and the high-pressure pipeline between the two valves is the inside of the bladder. Cavity 4 is shared by water supply and water outlet.

With this dual hydraulic bladder structure, through the switching of the reversing valve 8 between the two stations, the bladder outer cavity 5 in the left and right cylinder chambers can be switched synchronously and alternately between the two processes of oil injection and oil return, that is, The process of pressurization and water replenishment on the left and right sides of the piston 2 is reversed and carried out at the same time. Compared with the single-sack structure, the hydraulic station and the water supply pump no longer need to wait and start frequently, and the system works in a double-acting continuous pressurization mode. , the efficiency can be doubled. In addition, the expansion and contraction of the bladders 31 on the left and right sides of the piston 2 are also synchronously reversed, so that the left and right reciprocating sliding of the piston 2 forms a push-pull effect in which the force direction is always consistent, and the residual pressure of water replenishment and oil return can be fully utilized, thereby effectively greatly improve the energy conversion efficiency.

Obviously, with reference to the second embodiment and the third embodiment above, those skilled in the art will naturally understand that the expanded device with the double-capsule structure can also be used in reverse, that is, the fluid in the lumens 4 of the left and right bladders can be used. A is driven by high pressure to continuously compress and pump the low-pressure fluid B in the outer cavity of the bladder. Therefore, such an embodiment will not be described in detail in the form of pictures and texts.

To sum up, the fluid pressure conversion device provided by the present invention innovatively adopts the conversion mechanism of the pressure-bearing structure shared by the inner-flexible outer-rigid jacket and the bladder plug linkage, which can strictly isolate the two media to avoid mixed pollution, It can also expand the pressure adaptation range, and also help to reduce energy consumption and cost. It can be applied to the booster transmission of hydraulic and pneumatic machinery and the pumping and pressure regulation of fluid materials in the pressure pipeline system.

In the description of the present invention, it should be understood that the terms "portrait", "horizontal", "top", "bottom", "front", "rear", "left", "right", "inside", " The orientation or positional relationship indicated by "outside" is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention, rather than indicating or implying that the referred device or element must have a specific orientation or a specific orientation. construction and operation, and therefore should not be construed as limiting the invention.

The above-mentioned embodiments are only to describe the preferred modes of the present invention, but not to limit the scope of the present invention. Without departing from the design spirit of the present invention, those of ordinary skill in the art can make various modifications to the technical solutions of the present invention. Variations and improvements should fall within the protection scope determined by the claims of the present invention.

Claims (7)

1. A fluid pressure conversion device, characterized in that it comprises: a cylinder (1), a piston (2), a hydraulic bladder (3); The cylinder block (1) is a rigid shell, comprising a cylinder barrel (11) and a cylinder cover (12), the cylinder barrel (11) is a cylindrical chamber inside, and the cylinder cover (12) is mounted on the cylinder barrel At the end of (11), the center of the cylinder head (12) body is provided with a longitudinally penetrating mounting hole, and the cylinder body (1) has at least one port (14) for entering and exiting the fluid medium; The diameter of the piston (2) is adapted to the cylinder (11), and is installed in the cylinder (11) in a sliding manner, and an axial mounting hole (21) is provided at the center of the body of the piston (2); The hydraulic bladder (3) includes a bladder body (31) and a bladder nozzle (32), the bladder body (31) is a tubular soft bladder that can bear compression and tension, and has an impermeable layer and a reinforcing layer in the bladder wall, which is The diameter and length vary with the pressure difference between the inside and outside and the axial force at both ends, and can expand and contract radially and axially within a certain range; the bag nozzle (32) is installed at the end of the bag body (31). The connector is used for locking, sealing the bag mouth and assembling and connecting with other components; The hydraulic bladder (3) is arranged between the cylinder cover (12) and the piston (2) in the cylinder barrel (11), and the bladder nozzles (32) at both ends of the hydraulic bladder (3) are respectively embedded in the cylinder cover (12). ) and the mounting hole at the center of the piston (2) to form a tight and sealed connection; the bladder (31) connects the cylindrical space between the piston (3) and the cylinder head (12) in the cylinder (11) It is separated into two chambers, an inner cavity (4) and an outer cavity (5) of the sac, which are respectively used for accommodating the first fluid and the second fluid; During operation, the pressure or volume of the fluid in any one of the capsule inner cavity (4) and the capsule outer cavity (5) is actively changed, and the two fluids are expanded, contracted and stretched through the capsule body (31). The combined action of the sliding of the piston (2) interacts with each other, so that the pressure or volume of the fluid in the other cavity changes passively accordingly, and the change of the fluid pressure in the bladder cavity (4) is greater than that of the The variation of the fluid pressure in the extracapsular cavity (5), the variation of the volume of the extracapsular cavity (4) is greater than the variation of the volume of the capsule inner cavity (5). 2 . The fluid pressure conversion device according to claim 1 , wherein the installation method of the cylinder head ( 12 ) at the end of the cylinder barrel ( 11 ) is either a flange bolt or a screw thread. 3 . One or two, and the sealing method is any one or two of the sealing gasket or precision machining. 3. The fluid pressure conversion device according to claim 1, characterized in that, the locking and sealing method for the embedded connection of the capsule nozzle (32) in the cylinder head (12) and the piston (2) mounting holes is stepped hole matching, Any one or two of the three methods, such as taper hole fit or internal threaded hole fit. 4. The fluid pressure conversion device according to claim 1, wherein the bladder cavity (4) passes through the bladder nozzle (32) at least one of the cylinder head (12) and the piston (2) There is a channel for the first fluid to enter and exit. 5 . The fluid pressure conversion device according to claim 1 , wherein at least one port ( 14 ) for entering and exiting the second fluid in the outer bladder cavity ( 5 ) is provided on the cylinder body ( 1 ). 6 . 6 . The fluid pressure conversion device according to claim 1 , wherein the mounting holes at the center of the cylinder head ( 12 ) and the piston ( 2 ) are provided with threads for mounting valve parts, connecting parts or sealing parts. 7 . Wait. 7. The fluid pressure conversion device according to claim 1, characterized in that, among the two fluids in which pressure conversion occurs, the driving medium whose pressure is actively changed can be any one of water, pressure liquid or compressed gas, and is driven by The fluid can be any one of gaseous state, liquid state, solid-liquid mixed slurry state or gas-liquid phase metamorphosis.

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