Diaphragm compressor

Abstract

The diaphragm compressor comprises a cylinder cover, a cylinder body, a diaphragm, a plunger and a driving mechanism, the diaphragm is a shape memory alloy part, a cavity is formed between the cylinder cover and the cylinder body, the diaphragm is arranged in the cavity and divides the cavity into an air cavity and an oil cavity, the air cavity is used for being communicated with an air pipe, and the oil cavity is used for being communicated with an oil pipe. A channel communicated with the cavity is further formed in the cylinder body, the plunger is movably arranged in the channel, and the driving mechanism is used for driving the plunger to move in the channel so that the diaphragm can deform under the action of hydraulic oil in the oil cavity. The diaphragm is the shape memory alloy part, and compared with common metal, the shape memory alloy part has larger deformation amount of recoverable deformation, so that the requirement of the deeper cavity on the deformation amount of the diaphragm can be met, and the volume of the cavity is further increased. Moreover, as the deformation amount of the shape memory alloy part is larger, the diaphragm is not easy to crack under the working condition of fatigue operation, so that the reliability of the compressor is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of diaphragm compressors, and in particular, to a diaphragm compressor. Background Art

[0002] Hydrogen energy is a clean energy that is currently developing rapidly. Vehicles can be refueled with hydrogen at hydrogen refueling stations. Diaphragm compressors are the core equipment of hydrogen refueling stations. However, the current diaphragm compressors have low exhaust volume and cannot meet the market's refueling needs.

[0003] Among them, the cavity volume enclosed by the cylinder head and cylinder body of the diaphragm compressor is a key parameter affecting the compressor exhaust volume. The cavity volume is related to the dome inner surface diameter, maximum depth and surface shape. Although increasing the cavity volume by increasing the maximum depth can increase the exhaust volume of the diaphragm compressor, the required deformation of the metal diaphragm also increases. The metal diaphragm in the related technology has a small deformation amount and cannot meet the requirements of the diaphragm deformation amount of the deeper cavity. Summary of the invention

[0004] The purpose of the present disclosure is to provide a diaphragm compressor to solve the above technical problems.

[0005] In order to achieve the above-mentioned object, the present disclosure provides a diaphragm compressor, including a cylinder head, a cylinder body, a diaphragm, a plunger and a driving mechanism, wherein the diaphragm is a shape memory alloy part, a cavity is formed between the cylinder head and the cylinder body, the diaphragm is arranged in the cavity, and the cavity is divided into an air cavity and an oil cavity, the air cavity is used to communicate with an air pipe, and the oil cavity is used to communicate with an oil pipe;

[0006] The cylinder body is also provided with a channel connected with the cavity, the plunger is movably provided in the channel, and the driving mechanism is used to drive the plunger to move in the channel so that the diaphragm is deformed under the action of the hydraulic oil in the oil chamber.

[0007] Optionally, the diaphragm is configured to undergo elastic deformation and plastic deformation under the action of the air pressure in the air cavity, the oil pressure in the oil cavity and its own temperature change, so as to change from an initial state to a first memory state. In the first memory state, the diaphragm fits against the inner wall of the cylinder head.

[0008] Optionally, the diaphragm is configured to undergo elastic deformation and plastic deformation under the action of the air pressure in the air cavity, the oil pressure in the oil cavity and its own temperature change, so as to change from the first memory state to the second memory state. In the second memory state, the diaphragm fits against the inner wall of the cylinder body.

[0009] Optionally, the shape memory alloy component is a two-way shape memory alloy component.

[0010] Optionally, the maximum deformation of the diaphragm in the first direction is 10 times the elastic deformation of the diaphragm in the first direction;

[0011] The first direction is the same as the direction in which the plunger moves.

[0012] Optionally, the inner walls of the cylinder cover and the cylinder body are arc-shaped surfaces arranged opposite to each other, and the cavity is constructed as a dome-shaped cavity.

[0013] Optionally, the distance between the most concave point of the inner wall of the cylinder head and the most concave point of the inner wall of the cylinder body is 78mm-80mm.

[0014] Optionally, the diaphragm includes a deformation portion and an annular connecting portion, the inner wall of the annular connecting portion is connected to the periphery of the deformation portion, and the annular connecting portion is clamped between the cylinder body and the cylinder head.

[0015] Optionally, the air pipe includes an air inlet pipe and an air outlet pipe, the air inlet pipe and the air outlet pipe are respectively connected to the air cavity, and the air inlet pipe and the air outlet pipe are respectively provided with pressure valves.

[0016] Optionally, the inner walls of the cylinder head and the cylinder body are arc-shaped surfaces arranged opposite to each other, and the air outlet of the air outlet pipe is arranged at the most concave point of the inner wall of the cylinder head.

[0017] According to the above technical solution, since the diaphragm is a shape memory alloy, the shape memory alloy has a larger deformable amount of recoverable deformation than ordinary metals, so that the requirements of the diaphragm deformation amount of a deeper cavity can be met, and the volume of the cavity can be further increased. In addition, since the shape memory alloy has a larger deformable amount, the diaphragm is not easy to rupture under fatigue operating conditions, thereby improving the reliability of the compressor.

[0018] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0020] Figure 1 It is a cross-sectional schematic diagram of a diaphragm compressor provided in one embodiment of the present disclosure.

[0021] Description of Reference Numerals

[0022] 100-diaphragm compressor; 1-cylinder head; 2-cylinder body; 3-diaphragm; 31-deformation part; 32-annular connecting part; 4-plunger; 5-driving mechanism; 51-crankshaft; 52-connecting rod; 53-crosshead; 6-cavity; 61-air cavity; 62-oil cavity; 7-inlet pipe; 8-outlet pipe; 9-crankcase; 10-oil pump; 11-plunger pump; 12-overflow valve; 13-hydraulic oil delivery pipeline; 14-hydraulic oil discharge pipeline; 15-oil tank. DETAILED DESCRIPTION

[0023] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0024] In the present disclosure, in the absence of contrary description, "inside, outside" refers to the inside and outside of the contour of the corresponding component. In addition, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0025] like Figure 1 As shown, the present disclosure provides a diaphragm compressor 100, including a cylinder head 1, a cylinder body 2, a diaphragm 3, a plunger 4 and a driving mechanism 5. The diaphragm 3 is a shape memory alloy part. A cavity 6 is formed between the cylinder head 1 and the cylinder body 2. The diaphragm 3 is arranged in the cavity 6 and divides the cavity 6 into an air cavity 61 and an oil cavity 62. The air cavity 61 is used to communicate with the air pipe, and the oil cavity 62 is used to communicate with the oil pipe. A channel connected to the cavity 6 is also arranged in the cylinder body 2. The plunger 4 is movably arranged in the channel. The driving mechanism 5 is used to drive the plunger 4 to move in the channel, so that the diaphragm 3 is deformed under the action of the hydraulic oil in the oil cavity 62.

[0026] During the process of compressing gas in the diaphragm compressor 100, the plunger 4 is driven by the driving mechanism 5 to move in the channel toward the cavity 6, and the squeezed hydraulic oil enters the oil cavity 62 through the oil pipe. The pressure is transmitted to the diaphragm 3 through the hydraulic oil. The diaphragm 3 can be deformed under the action of the hydraulic oil, squeezing the air cavity 61 to reduce the volume of the air cavity 61, thereby squeezing the gas in the air cavity 61 and increasing the pressure of the gas. On the contrary, during the process of inhaling gas in the diaphragm compressor 100, the plunger 4 is driven by the driving mechanism 5 to move in the channel away from the cavity 6, and the pressure on the hydraulic oil in the oil cavity 62 is reduced accordingly. The diaphragm 3 is deformed toward the oil cavity 62 accordingly, and the volume of the air cavity 61 increases. The gas is sucked into the air cavity 61 through the air pipe to prepare for the next compression.

[0027] Through the above technical solution, since the diaphragm 3 is a shape memory alloy, the shape memory alloy has a larger deformable amount of recoverable deformation than ordinary metals, so that the need for the deformation amount of the diaphragm 3 of the deeper cavity 6 can be met, and the volume of the cavity 6 is further increased. In addition, since the shape memory alloy has a larger deformable amount, the diaphragm 3 is not easy to rupture under fatigue operating conditions, thereby improving the reliability of the compressor.

[0028] In order to improve the fit between the diaphragm 3 and the cylinder head 1, the diaphragm 3 is optionally configured to be able to undergo elastic deformation and plastic deformation under the action of the air pressure in the air cavity 61, the oil pressure in the oil cavity 62 and its own temperature change, so as to change from the initial state to the first memory state. In the first memory state, the diaphragm 3 fits the inner wall of the cylinder head 1. In the process of compressing gas, the diaphragm compressor 100 deforms toward the air cavity 61 as the oil pressure of the oil cavity 62 on one side of the diaphragm 3 squeezes. The gas in the air cavity 61 is squeezed by the diaphragm 3, and the volume decreases, the pressure increases, and the temperature also increases accordingly; at the same time, the diaphragm 3 begins to transition from elastic deformation to plastic deformation as the deformation amount increases under the action of the oil pressure, further increasing the deformation amount of the diaphragm 3. In this deformation process, in addition to being affected by the oil pressure, the diaphragm 3 will also deform from the initial state to the first memory state due to the increase in the temperature of the air cavity 61 until the diaphragm 3 fits the inner wall of the cylinder head 1. With such arrangement, the diaphragm 3 can fit more closely with the inner wall of the cylinder head 1 due to the dual effects of oil pressure and its own deformation, so that the gas in the air cavity 61 can be discharged as much as possible, thereby increasing the exhaust volume of the diaphragm compressor 100.

[0029] Optionally, the diaphragm 3 is configured to undergo elastic deformation and plastic deformation under the action of the air pressure in the air cavity 61, the oil pressure in the oil cavity and its own temperature change, so as to change from a first memory state to a second memory state. In the second memory state, the diaphragm 3 fits against the inner wall of the cylinder body 2. When the diaphragm 3 is in the first memory state, the compressed gas in the air cavity 61 is discharged from the air cavity 61 through the air pipe. At this time, the hydraulic oil in the oil cavity 62 on the other side of the diaphragm 3 flows out of the oil cavity 62 under the drive of the plunger 4, so that the pressure in the oil cavity 62 gradually becomes the same as and less than that in the air cavity 61. The diaphragm 3 is deformed toward the oil cavity 62 under the action of the pressure, and the temperature in the air cavity 61 is reduced while the gas enters the air cavity 61. As the diaphragm 3 gradually deforms toward the oil cavity 62 under the action of the air pressure, the diaphragm 3 transitions from elastic deformation to plastic deformation. As the temperature in the air cavity 61 decreases, the diaphragm 3 made of a shape memory alloy is transformed into the second memory state due to the temperature change, and the diaphragm 3 fits the inner wall of the cylinder body 2. In this way, a cycle of compression, exhaust and intake can be completed. During the cycle, the diaphragm 3 changes from the first memory state to the second memory state by utilizing temperature changes. On the one hand, the plastic deformation of the first memory state is restored to the initial state, and on the other hand, a driving force other than fluid pressure is provided for the deformation of the diaphragm 3, thereby improving the fit between the diaphragm 3 and the inner wall of the cavity 6.

[0030] Here, the initial state refers to a state in which the diaphragm 3 is located between the air chamber 61 and the oil chamber 62 and does not deform to either side.

[0031] Among them, since the diaphragm 3 is a shape memory alloy, the plastic deformation of the diaphragm 3 can be restored to the state before the plastic deformation under the influence of temperature, so that the deformable amount of the diaphragm 3 is larger, increasing the exhaust volume of the diaphragm compressor 100.

[0032] It should be noted that in the present disclosure, the memory alloy used to make the diaphragm 3 can be a memory alloy of any suitable material, and the present disclosure does not limit this. For example, the memory alloy used to make the diaphragm 3 can be a nickel-titanium alloy, and in order to make the diaphragm 3 made of the nickel-titanium alloy present a first memory state and a second memory state, the nickel-titanium alloy needs to be repeatedly heated / cooled and deformed so that the nickel-titanium alloy finally has a two-way memory effect, that is, at ambient temperature, the diaphragm 3 made of the nickel-titanium alloy presents a second memory state, and when the temperature rises, the diaphragm 3 made of the nickel-titanium alloy presents a first memory state, so that the diaphragm 3 can present different desired states by making the diaphragm 3 at ambient temperature or a heated temperature.

[0033] Optionally, the shape memory alloy component can be a two-way memory alloy component. Since the two-way memory alloy component has different shapes under different temperature conditions, and the temperature will also change as the air pressure in the air cavity 61 changes, the diaphragm 3 made of the two-way memory alloy component can change between a first memory state and a second memory state according to temperature changes, thereby meeting the needs of the compression process of the diaphragm compressor 100. The diaphragm 3 deforms with pressure on the one hand, and deforms with temperature on the other hand, so that the deformation driving force of the diaphragm 3 is stronger, the deformation amount of the diaphragm 3 is larger, and the exhaust volume of the diaphragm compressor 100 is increased.

[0034] Optionally, the maximum deformation of the diaphragm 3 in the first direction is 10 times the elastic deformation of the diaphragm 3 in the first direction. The first direction is the same as the direction of movement of the plunger 4. Since the diaphragm compressor 100 mainly inhales or squeezes gas through the deformation of the diaphragm 3 during the process of compressing gas, the greater the deformability of the diaphragm 3, the more gas can be inhaled, and the greater the displacement of the diaphragm compressor 100. The maximum deformation of the diaphragm 3 in the present disclosure is 10 times the elastic deformation of the diaphragm 3, and the relative exhaust volume is also greatly increased.

[0035] Optionally, the inner walls of the cylinder head 1 and the cylinder body 2 are relatively arranged arc surfaces, and the cavity 6 is constructed as a dome-shaped cavity. Since the volume of the sphere is the largest when the surface area is the same, both the dome-shaped cavity and the spherical cavity have arc-shaped inner walls, and therefore, the dome-shaped cavity 6 can accommodate more gas, further increasing the displacement of the diaphragm compressor 100. At the same time, the inner walls of the cylinder head 1 and the cylinder body 2 are arranged as relatively arc-shaped surfaces, so that the diaphragm 3 fits more closely with the inner walls of the cylinder head 1 and the cylinder body 2, and the volume of the cavity 6 can be used as much as possible, thereby increasing the amount of compressed gas of the diaphragm compressor 100.

[0036] Optionally, when the diameter of the cavity 6 is 300 mm, the distance between the most concave point of the inner wall of the cylinder head 1 and the most concave point of the inner wall of the cylinder body 2 is 78 mm-80 mm. The diameter of the cavity 6 refers to the diameter of the circle formed by the intersection of the inner wall of the cylinder head 1 and the inner wall of the cylinder body 2. In the related art, the distance between the most concave point of the inner wall of the cylinder head and the most concave point of the inner wall of the cylinder body is generally 7 mm-8 mm. The present application adopts a shape memory alloy as the diaphragm 3, which greatly increases the depth of the cavity 6, so that the cavity 6 can accommodate more gas, thereby improving the exhaust volume of the diaphragm compressor 100.

[0037] To fix the diaphragm 3, optionally, Figure 1As shown, the diaphragm 3 includes a deformation portion 31 and an annular connection portion 32, the inner wall of the annular connection portion 32 is connected to the periphery of the deformation portion 31, and the annular connection portion 32 is clamped between the cylinder body 2 and the cylinder head 1. The annular connection portion 32 of the diaphragm 3 is clamped between the cylinder body 2 and the cylinder head 1 and connected to the deformation portion 31 of the diaphragm 3. On the one hand, the cavity 6 can be separated into an oil cavity 62 and an air cavity 61 by the diaphragm 3 to ensure that the hydraulic oil and the compressed gas will not be mixed; on the other hand, the deformation portion 31 of the diaphragm 3 is fixed by the annular connection portion 32, and the position of the deformation portion 31 will not change too much during the deformation process, which is conducive to the deformation portion 31 changing between different shapes without offset.

[0038] Alternatively, if Figure 1 As shown, the air pipe includes an air inlet pipe 7 and an air outlet pipe 8, and the air inlet pipe 7 and the air outlet pipe 8 are respectively connected to the air cavity 61, and pressure valves are respectively provided at the air inlet pipe 7 and the air outlet pipe 8. In the process of compressing gas in the diaphragm compressor 100, the gas to be compressed enters the air cavity 61 through the air inlet pipe 7, and the compressed gas is discharged from the air cavity 61 through the air outlet pipe 8. When the diaphragm 3 deforms from the initial state to the first memory state, the gas in the air cavity 61 is gradually compressed. When the air pressure in the air cavity 61 reaches the opening pressure of the pressure valve at the air outlet pipe 8, the pressure valve opens, and the compressed gas is discharged through the air outlet pipe 8; when the diaphragm 3 deforms from the first memory state to the second memory state, the volume of the air cavity 61 increases, and the air pressure in the air cavity 61 gradually decreases. When the air pressure in the air cavity 61 reaches the opening pressure of the pressure valve at the air inlet pipe 7, the pressure valve opens, and the gas enters the air cavity 61 from the air inlet pipe 7. An air outlet pipe 8 and an air inlet pipe 7 are separately provided, and pressure valves are arranged at the air outlet pipe 8 and the air inlet pipe 7, so as to ensure that the compressed gas discharged from the diaphragm compressor 100 during the compression process reaches the required pressure standard.

[0039] Alternatively, if Figure 1 As shown, the inner walls of the cylinder head 1 and the cylinder body 2 are relatively arranged arc-shaped surfaces, and the air outlet of the air outlet pipe 8 is arranged at the most concave point of the inner wall of the cylinder head 1. Since the inner wall of the cylinder head 1 is an arc-shaped surface, during the process of the diaphragm 3 being compressed and fitted with the inner wall of the cylinder head 1, no air gap will appear between the diaphragm 3 and the inner wall of the cylinder head 1 due to the inability to fit, thereby increasing the exhaust volume. At the same time, the air outlet of the air outlet pipe 8 is arranged at the most concave point of the inner wall of the cylinder head 1. When the diaphragm 3 is deformed and fitted with the inner wall of the cylinder head 1, the gas between the diaphragm 3 and the inner wall will be squeezed to the most concave point, so that the gas in the air cavity 61 can be discharged as much as possible, thereby increasing the exhaust volume of the diaphragm compressor 100.

[0040] Alternatively, if Figure 1As shown, the driving mechanism 5 may include a crankshaft 51, a connecting rod 52 and a crosshead 53. The two ends of the connecting rod 52 are hinged to the crankshaft 51 and the crosshead 53 respectively. The crosshead 53 is transmission-connected to the plunger 4, so that the plunger 4 can reciprocate in the channel as the crankshaft 51 rotates and is driven by the connecting rod 52.

[0041] Alternatively, if Figure 1 As shown, the diaphragm compressor 100 also includes a crankcase 9, an oil pump 10, a plunger pump 11, a relief valve 12, a hydraulic oil delivery pipeline 13 and an oil tank 15. The crankshaft 51 is arranged in the crankcase 9. The two ends of the hydraulic oil delivery pipeline 13 are respectively connected to the oil chamber 62 and the oil tank 15. The hydraulic oil delivery pipeline 13 is provided with an oil pump 10 and a plunger pump 11. The oil pump 10 is used to pump the hydraulic oil out of the oil tank 15, and the plunger pump 11 is used to pressurize the hydraulic oil so that the hydraulic oil can enter the oil chamber 62. The other side of the oil chamber 62 is also connected to a hydraulic oil discharge pipeline 14, and the relief valve 12 is arranged at the entrance where the hydraulic oil discharge pipeline 14 is connected to the oil chamber 62.

[0042] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0043] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0044] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A diaphragm compressor, characterized in that: It includes a cylinder head, a cylinder body, a diaphragm, a plunger and a driving mechanism, wherein the diaphragm is a shape memory alloy part, a cavity is formed between the cylinder head and the cylinder body, the diaphragm is arranged in the cavity and divides the cavity into an air cavity and an oil cavity, the air cavity is used to communicate with an air pipe, and the oil cavity is used to communicate with an oil pipe; The cylinder body is also provided with a channel connected with the cavity, the plunger is movably provided in the channel, and the driving mechanism is used to drive the plunger to move in the channel so that the diaphragm is deformed under the action of the hydraulic oil in the oil chamber.

2. The diaphragm compressor according to claim 1, characterized in that: The diaphragm is configured to undergo elastic deformation and plastic deformation under the action of the air pressure in the air cavity, the oil pressure in the oil cavity and its own temperature change, so as to change from an initial state to a first memory state. In the first memory state, the diaphragm fits against the inner wall of the cylinder head.

3. The diaphragm compressor according to claim 2, characterized in that: The diaphragm is configured to undergo elastic deformation and plastic deformation under the action of the air pressure in the air cavity, the oil pressure in the oil cavity and its own temperature change, so as to change from the first memory state to the second memory state. In the second memory state, the diaphragm fits against the inner wall of the cylinder body.

4. The diaphragm compressor according to claim 3, characterized in that: The shape memory alloy part is a two-way memory alloy part.

5. The diaphragm compressor according to claim 1, characterized in that: The maximum deformation amount of the diaphragm in the first direction is 10 times the elastic deformation of the diaphragm in the first direction; The first direction is the same as the direction in which the plunger moves.

6. The diaphragm compressor according to any one of claims 1 to 5, characterized in that: The inner walls of the cylinder cover and the cylinder body are arc-shaped surfaces arranged opposite to each other, and the cavity is constructed as a dome-shaped cavity.

7. The diaphragm compressor according to claim 6, characterized in that: The distance between the most concave point of the inner wall of the cylinder head and the most concave point of the inner wall of the cylinder body is 78mm-80mm.

8. The diaphragm compressor according to claim 6, characterized in that: The diaphragm includes a deformation portion and an annular connection portion, the inner wall of the annular connection portion is connected to the periphery of the deformation portion, and the annular connection portion is clamped between the cylinder body and the cylinder cover.

9. The diaphragm compressor according to any one of claims 1 to 5, characterized in that: The air pipe comprises an air inlet pipe and an air outlet pipe, the air inlet pipe and the air outlet pipe are respectively communicated with the air cavity, and pressure valves are respectively arranged at the air inlet pipe and the air outlet pipe.

10. The diaphragm compressor according to claim 9, characterized in that The inner walls of the cylinder cover and the cylinder body are arc-shaped surfaces arranged opposite to each other, and the air outlet of the air outlet pipe is arranged at the most concave point of the inner wall of the cylinder cover.

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