Patent Application
20240360823
The application claims priority to Chinese patent application No. 2022101729579, filed on Feb. 22, 2022, the entire contents of which are incorporated herein by reference.
The present application relates to the technical field of diaphragm compressors, in particular to a high-pressure diaphragm compressor.
A diaphragm compressor is a positive displacement compressor, and is widely applied to the petrochemical field such as a hydrogen station for compressing and conveying various high-purity gases, precious rare gases, toxic and harmful gases and corrosive gases due to good sealing performance, wide pressure range and large compression ratio.
A diaphragm head body of the diaphragm compressor generally consists of a gas-side diaphragm head, an oil-side diaphragm head and a diaphragm. The diaphragm is clamped between the gas-side diaphragm head and the oil-side diaphragm head, the peripheral part of the diaphragm is fixedly supported by the oil-side diaphragm head and the gas-side diaphragm head, and an oil-side diaphragm cavity and a gas-side diaphragm cavity are respectively formed between the middle part of the diaphragm and the oil-side diaphragm head as well as between the middle part of the diaphragm and the gas-side diaphragm head. The oil-side diaphragm cavity is filled with hydraulic oil, and the gas-side diaphragm cavity is filled with compressed working media. A piston pushes the hydraulic oil in the oil-side diaphragm cavity to drive the diaphragm to deform and compress the gas-side diaphragm cavity to realize compression of the working media. In the prior art, a piston is usually driven by a crank connecting rod to push hydraulic oil so as to drive a diaphragm to perform reciprocating deflection deformation, and a primary low-pressure oil pump, a secondary oil supplementing plunger pump and an oil overflow valve are arranged to ensure that a diaphragm head body works normally. The structure is very mature for medium and low pressure environments, but has the following disadvantages for a high pressure environment:
In order to solve the above technical problems, embodiments of the present application provide a high-pressure diaphragm compressor, which not only solves the problem of piston sealing of a high-pressure diaphragm compressor and the problem that air is easily mixed in an oil-side diaphragm cavity, but also solves the problem that it is difficult to achieve an excessively high oil supplementing pressure.
In order to achieve the above objectives, an embodiment of the present application provides a high-pressure diaphragm compressor, including a gas-side diaphragm head and an oil-side diaphragm head which are sequentially disposed in an axial direction; a diaphragm and an oil distribution disc are disposed between the gas-side diaphragm head and the oil-side diaphragm head, the diaphragm and the oil distribution disc are clamped between the gas-side diaphragm head and the oil-side diaphragm head, and a gas-side diaphragm cavity and an oil-side diaphragm cavity are respectively formed between the diaphragm and the gas-side diaphragm head as well as between the diaphragm and the oil distribution disc; an oil cylinder hole is provided in the oil-side diaphragm head, a piston is arranged in the oil cylinder hole, and a piston rod is disposed below the piston; and an upper end of the piston rod abuts onto a lower end of the piston, and a lower end of the piston rod is connected with a compressor crank-connecting rod mechanism.
Further, the oil-side diaphragm cavity is connected with a low-pressure oil pump through an oil supplementing pipeline; the low-pressure oil pump can adjust an oil supplementing amount according to a pressure in the oil-side diaphragm cavity; and a one-way valve is disposed on the oil supplementing pipeline, and an opening of the one-way valve faces the low-pressure oil pump.
Further, the low-pressure oil pump is a gear pump or a cycloid pump.
Further, an energy accumulator is further disposed on the oil supplementing pipeline; and the energy accumulator is located between the one-way valve and the low-pressure oil pump.
Further, the piston is a plunger, a piston ring seal structure, or a spring seal structure.
Further, an oil cylinder sleeve mounting cavity is disposed in the oil-side diaphragm head, an oil cylinder sleeve is disposed in the oil cylinder sleeve mounting cavity, and an inner hole of the oil cylinder sleeve forms the oil cylinder hole.
Further, the gas-side diaphragm head includes a gas-side cylinder cover and a gas distribution disc, the gas distribution disc is located below the gas-side cylinder cover, the diaphragm and the gas distribution disc are clamped between the gas-side cylinder cover and the oil distribution disc, and the gas-side diaphragm cavity and the oil-side diaphragm cavity are respectively formed between the diaphragm and the gas distribution disc as well as between the diaphragm and the oil distribution disc.
Further, the oil-side diaphragm cavity is connected with an overflow valve through an oil overflow pipeline.
Compared with the prior art, the present application has the following beneficial effects:
In order to more clearly explain the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the description of the embodiments or the prior art. Obviously, the drawings in the following description are merely some embodiments of the present application. For those of ordinary skilled in the art, other drawings can be acquired according to these drawings without paying creative effort.
The technical solutions in embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are merely some embodiments of the present application, and not all embodiments. All other embodiments acquired by those of ordinary skilled in the art based on the embodiments in the present application without making any creative labor fall within the protection scope of the present application.
In the description of the present application, it should be understood that the terms “center”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, and the like indicate orientations or positional relationships based on those shown in the drawings, which is merely for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the apparatus or element referred to must have a specific orientation, be constructed and operate in the specific orientation, so it cannot be understood as a limitation to the present application.
In the description of the present application, it should be noted that, unless otherwise explicitly stated or limited, the terms “mounted”, “connected”, and “connection” should be understood in a broad sense, and may be, for example, a fixed connection, a detachable connection, or an integral connection, and the specific meaning of the above terms in the present application can be understood according to the specific situation for those of ordinary skilled in the art.
The terms “first” and “second” are merely for the purpose of description and are not to be understood as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature as “first” or “second” may explicitly or implicitly include one or more of that feature. In the description of the present application, the meaning of “a plurality” is two or more unless otherwise specified.
In high-pressure working scenes such as a hydrogenation station, compression equipment for hydrogen or other dangerous and rare gases with the pressure of 90 MPa or even more than 200 MPa is required, so that the requirements for the sealing performance of the compression equipment and the cleanliness of compressed working media are high. Only a diaphragm compressor can best meet the working requirements, but the high-pressure working environment has higher requirements for the structural strength of the compressor, and the sealing of an oil piston, the service life of a diaphragm and the oil supplementing mode are also huge challenges faced by the high-pressure diaphragm compressor. Therefore, an embodiment of the present application provides a high-pressure diaphragm compressor, the sealing of the oil piston is more reliable in the high-pressure working environment, gas cannot enter an oil cavity, oil supplementing is easier to realize, and the oil supplementing amount can be self-regulated along with the leakage amount.
Referring to
The gas-side diaphragm head 1, the diaphragm 2, the oil distribution disc 3 and the oil-side diaphragm head 4 are sequentially disposed in an axial direction. The gas-side diaphragm head 1 is a split component and includes a gas-side cylinder cover 101 and a gas distribution disc 102, the gas distribution disc 102 is located below the gas-side cylinder cover 101, the diaphragm 2 is clamped between the gas distribution disc 102 and the oil distribution disc 3, and a gas-side diaphragm cavity 5 and an oil-side diaphragm cavity 6 are formed between the diaphragm 2 and the gas distribution disc 102 as well as between the diaphragm 2 and the oil distribution disc 3 respectively. Thus, the gas-side cylinder cover 101 may be made of a material with higher strength, and the gas distribution disc 102 may be made of a material selected according to the requirement of a conveyed compressed medium, so that the requirements of high strength and high corrosion resistance of the gas-side diaphragm head can be met at the same time.
The oil-side diaphragm head 4 is internally provided with an oil cylinder hole 41, the oil cylinder hole 41 is a circular through hole, the piston 7 is disposed in the oil cylinder hole 41, and the piston 7 is configured to seal high-pressure oil in the oil cylinder hole 41 and may reciprocate in the oil cylinder hole 41 to push hydraulic oil to further drive the diaphragm 2 to make reciprocating flexural deformation. Specifically, the piston 7 may be a plunger, a piston ring seal structure, or a spring seal structure, which is not limited herein.
The piston rod 8 is disposed below the piston 7. The upper end of the piston rod 8 abuts onto the lower end of the piston 7, and the lower end of the piston rod 8 is connected with a compressor crank-connecting rod mechanism (not shown). Since the piston rod 8 and the piston 7 are separated and are not fixedly connected, compared with an integral piston (namely a piston rod and a piston are an integrated component), a split type structure is adopted, the centering performance of the piston 7 and the oil cylinder hole 41 is better guaranteed, that is, not affected by the assembly precision between the piston rod 8 and the compressor crank-connecting rod mechanism, the phenomenon that the piston 7 gets stuck due to eccentric abrasion is avoided, and sealing of the piston 7 is made more reliable.
The low-pressure oil pump 9 is communicated with the oil-side diaphragm cavity 6 through an oil supplementing pipeline 10, and low-pressure oil pump 9 may adjust the oil supplementing amount according to the leakage amount. Specifically, the low-pressure oil pump 9 may be a gear pump or a cycloid pump. The one-way valve 11 and the energy accumulator 12 are also disposed on the oil supplementing pipeline 10, and the energy accumulator 12 is disposed between the one-way valve 11 and the low-pressure oil pump 9. The one-way valve 11 is configured to separate a low-pressure oil passage from a high-pressure oil passage. An opening of the one-way valve 11 faces toward the low-pressure oil pump 9 and the energy accumulator 12. The energy accumulator 12 can reduce pressure fluctuation during oil supplementing, so that the oil supplementing pressure is more stable, and the problems of service life reduction and sealing failure of the one-way valve 11 caused by vibration can be avoided. The overflow valve 13 is connected with the oil-side diaphragm cavity 6 through an oil overflow pipeline 14, and redundant hydraulic oil overflows through the overflow valve 13.
Referring to
In the process of the lower stroke, the oil pressure is almost equal to the suction pressure, since the piston 7 and the piston rod 8 are disconnected, the piston rod 8 can not exert pulling force to the piston 7, the piston 7 moves downwards along with the piston rod 8 under the pushing of the hydraulic oil in the oil-side diaphragm cavity 6 until the diaphragm 2 strikes the oil distribution disc 3, the oil pressure in the oil-side diaphragm cavity 6 descends rapidly, when the oil pressure drops to about zero, the oil pressure is not enough to promote the piston 7 to move, at this moment, only the piston rod 8 is driven by the compressor crank-connecting rod mechanism to continue to move downwards, the piston 7 is static and breaks away from with the piston rod 8, and the negative pressure is not produced in the oil-side diaphragm cavity 6, so that the condition that air is mixed in the oil-side diaphragm cavity can be avoided.
Referring to
In addition, in the prior art, the oil supplementing of a low-pressure oil pump 9 and a secondary oil supplementing plunger pump is passive oil supplement, the period of the plunger pump is the same as that of a compressor, the oil supplementing amount in each stroke is fixed, no matter what the leakage amount is, a certain amount of hydraulic oil may be supplemented into the oil-side diaphragm cavity 6, and the oil supplementing amount cannot be adjusted along with the leakage amount. In the embodiment of the present application, the oil is actively supplemented only by using the low-pressure oil pump 9, when the oil amount is low, the diaphragm 2 strikes the oil distribution disc 3, the oil pressure is rapidly reduced, the hydraulic oil is automatically supplemented into the oil-side diaphragm cavity 6, and the oil supplementing amount is self-regulated along with the leakage amount. The larger the leakage amount is, the earlier the diaphragm strikes the oil distribution disc, the longer the oil pressure is near the zero line, the more oil is supplemented, and the smaller the oil is supplemented.
Referring to
Referring to
The above are merely the specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any changes or substitutions within the technical scope disclosed in the present application should fall within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2022101729579 | Feb 2022 | CN | national |
| Number | Date | Country | |
|---|---|---|---|
| Parent | PCT/CN2022/128918 | Nov 2022 | WO |
| Child | 18765350 | US |
