Oil cylinder for diaphragm compressor

Abstract

The present disclosure relates to a diaphragm compressor oil cylinder, comprising: a cylinder body, an installation hole is formed inside; and a plunger sleeve, which is a shape memory alloy part and has a first memory state and a second memory state, when the plunger sleeve is in the first memory state, the plunger sleeve presents a first memory size so that the plunger sleeve is interference fitted in the installation hole; when the plunger sleeve contacts a cooling medium so that the plunger sleeve is in the second memory state, the plunger sleeve presents a second memory size so that the plunger sleeve is separated from the installation hole. The diaphragm compressor oil cylinder provided by the present disclosure can facilitate the extraction and replacement of the plunger sleeve.

Description

Technical Field

[0001] This disclosure relates to the field of diaphragm compressor technology, and more specifically, to a hydraulic cylinder for a diaphragm compressor. Background Technology

[0002] Energy is the cornerstone of human society and the driving force for its development. High-pressure hydrogen is currently the main way to utilize hydrogen energy. Diaphragm compressors are one of the core devices in the hydrogen energy supply chain. Their function is to boost low-pressure hydrogen to high pressure, with a maximum pressure of 90 MPa and a compression frequency of about 400 times per minute.

[0003] A diaphragm compressor consists of an air chamber and an oil chamber, separated by a diaphragm. The diaphragm, cylinder, plunger sleeve, and plunger seal form a sealed oil chamber filled with hydraulic oil. Driven by power, the plunger reciprocates within the cylinder. When the plunger moves upward from the bottom dead center, it pushes the hydraulic oil in the oil chamber in the same direction, which in turn deforms the diaphragm in the upward direction, increasing the pressure in both the oil and air chambers. When the plunger moves downward from the top dead center, the hydraulic oil in the oil chamber moves in the same direction, deforming the diaphragm in the downward direction, decreasing the pressure in both the oil and air chambers.

[0004] Since the plunger reciprocates inside the cylinder, the cylinder must have high wear resistance. To reduce the difficulty of machining, the cylinder is usually disassembled into two parts: the cylinder body and the plunger sleeve. The plunger sleeve, which has a high hardness and a high smoothness inner hole, is interference-fitted into the inner hole of the cylinder body. To ensure sealing performance, the clearance between the outer diameter of the plunger and the plunger sleeve is usually set to the minimum value under high pressure. However, because the plunger often experiences radial movement during operation, too small a clearance or too large movement can cause the plunger and plunger sleeve to come into contact, get scratched, or even seize up. In this case, the scratched plunger sleeve needs to be removed and replaced. However, plunger sleeves that are interference-fitted into the cylinder bore are difficult to remove by cooling and can only be removed by turning. However, the high hardness of the inner surface increases the difficulty of turning. To facilitate the removal of the plunger sleeve, the installation of the plunger sleeve and the cylinder body is changed from an interference fit to a clearance fit in engineering, and a sealing ring is added between the two. However, this structure not only increases the risk of lubricating oil leakage from the joint surface of the plunger sleeve and the cylinder body under high pressure, but also aggravates the fatigue damage of the cylinder body caused by periodic pressure changes.

[0005] Therefore, there is an urgent need to find a new structure to facilitate the removal and replacement of the plunger sleeve after it has been damaged. Summary of the Invention

[0006] The purpose of this disclosure is to provide a hydraulic cylinder for a diaphragm compressor that allows for easy removal and replacement of the plunger sleeve.

[0007] To achieve the above objectives, this disclosure provides a cylinder for a diaphragm compressor, comprising: a cylinder body having an internal mounting hole; and a plunger sleeve, which is a shape memory alloy and has a first memory state and a second memory state. When the plunger sleeve is in the first memory state, the plunger sleeve presents a first memory size so that the plunger sleeve is interference-fitted into the mounting hole; when the plunger sleeve contacts a cooling medium so that the plunger sleeve is in the second memory state, the plunger sleeve presents a second memory size so that the plunger sleeve disengages from the mounting hole.

[0008] Optionally, the cylinder for the diaphragm compressor further includes a plunger disposed within the plunger sleeve and reciprocating axially relative to the plunger sleeve. When the plunger sleeve is in the first memory state, a fitting gap is formed between the plunger and the plunger sleeve, and a sealing element is disposed within the fitting gap.

[0009] Optionally, the sealing element is constructed as a sealing ring, and an annular groove is formed circumferentially on the outer side wall of the plunger. The sealing ring is installed in the annular groove to close the mating gap between the plunger and the plunger sleeve.

[0010] Optionally, the first memory size includes the original size and the deformed size, and the fitting clearance includes a first fitting clearance and a second fitting clearance. When the plunger sleeve presents the original size, the plunger sleeve is interference-fitted into the mounting hole and the first fitting clearance is formed between the plunger and the plunger sleeve. When the plunger sleeve is deformed to present the deformed size, the plunger sleeve is interference-fitted into the mounting hole and the second fitting clearance is formed between the plunger and the plunger sleeve.

[0011] Optionally, the deformation dimension includes a shrinkage deformation dimension and an expansion deformation dimension, and the second fitting clearance includes a shrinkage clearance and an expansion clearance. When the plunger sleeve shrinks and deforms to present the shrinkage deformation dimension, the shrinkage clearance is formed between the plunger and the plunger sleeve; when the plunger sleeve expands and deforms to present the expansion deformation dimension, the expansion clearance is formed between the plunger and the plunger sleeve; wherein the shrinkage clearance is larger than the first fitting clearance, and the first fitting clearance is larger than the expansion clearance.

[0012] Optionally, the diaphragm compressor cylinder further includes a temperature regulating device. This device adjusts the temperature of the hydraulic oil in the cylinder's oil chamber according to the cylinder's exhaust pressure, causing the plunger sleeve to switch between the contraction deformation size and the expansion deformation size. When the exhaust pressure is a first exhaust pressure, the temperature regulating device adjusts the temperature of the hydraulic oil in the oil chamber to a first temperature, causing the plunger sleeve to exhibit the contraction deformation size. When the exhaust pressure is a second exhaust pressure, the temperature regulating device adjusts the temperature of the hydraulic oil in the oil chamber to a second temperature, causing the plunger sleeve to exhibit the expansion deformation size. The first exhaust pressure is less than the second exhaust pressure, and the first temperature is less than the second temperature.

[0013] Optionally, the temperature regulating device includes a pressure detector, a temperature regulator, and a controller. The pressure detector and the temperature regulator are respectively communicatively connected to the controller. The pressure detector is used to detect the exhaust pressure of the cylinder and transmit the pressure signal to the controller. The controller controls the temperature change of the temperature regulator according to the pressure signal.

[0014] Optionally, the pressure detector is configured as a pressure sensor, which is installed on the exhaust pipe after the exhaust passage of the cylinder head; the temperature regulator includes a heater and a cooler, the heater is installed in the oil tank of the cylinder, and the cooler is installed on the hydraulic oil delivery pipe of the cylinder. The pressure sensor, the heater, and the cooler are respectively communicatively connected to the controller so that the controller controls the operation of the cooler or the heater according to the exhaust pressure detected by the pressure sensor.

[0015] Optionally, the range of the first exhaust pressure and the second exhaust pressure is 20MPa-90MPa.

[0016] Optionally, the values ​​of the first temperature and the second temperature are both in the range of 10℃-70℃.

[0017] Through the above technical solution, in the diaphragm compressor cylinder provided in this disclosure, the plunger sleeve is constructed as a shape memory alloy part, and has a first memory state and a second memory state. In the first memory state, the plunger sleeve presents a first memory size that is interference-fitted into the mounting hole. When in contact with the cooling medium, the plunger sleeve is affected by the cooling medium and switches to the second memory state, presenting a second memory size that can be detached from the mounting hole. Thus, when it is necessary to remove the plunger sleeve from the mounting hole in the cylinder body, the plunger sleeve can be switched to the second memory state by contacting the plunger sleeve with the cooling medium. At this time, the plunger sleeve presents a second memory size, which makes the outer diameter of the plunger sleeve smaller than the inner diameter of the mounting hole, thereby making it easy to remove the plunger sleeve from the mounting hole in the cylinder body. Furthermore, when the plunger sleeve needs to be interference-fitted into the cylinder block's mounting hole, the plunger sleeve can first switch to a second memory state and exhibit a second memory size by contacting the cooling medium. Then, the plunger sleeve with the second memory size is placed in the cylinder block's mounting hole. Subsequently, at ambient temperature, the plunger sleeve gradually switches from the second memory state to the first memory state. Simultaneously, the plunger sleeve's size gradually returns from the second memory size to the first memory size, ultimately achieving an interference fit into the cylinder block's mounting hole. Therefore, by utilizing the memory characteristics of the plunger sleeve as a shape-memory alloy component, this disclosure not only facilitates the removal of the plunger sleeve from the cylinder block's mounting hole but also simplifies the process of interference-fitting the plunger sleeve into the cylinder block's mounting hole.

[0018] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of the hydraulic cylinder for the diaphragm compressor disclosed herein.

[0020] Explanation of reference numerals in the attached figures 1-Cylinder block; 10-Cylinder head; 11-Mounting hole; 2-Plunger sleeve; 3-Plunger; 31-Annular groove; 4-Seal; 41-Sealing ring; 5-Temperature regulating device; 51-Pressure detector; 511-Pressure sensor; 52-Temperature regulator; 521-Heater; 522-Cooler; 53-Controller; 6-Oil chamber; 7-Exhaust passage; 8-Oil tank; 9-Hydraulic oil delivery pipeline. Detailed Implementation

[0021] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0022] In this disclosure, unless otherwise stated, directional terms such as "inner" and "outer" refer to "inner" and "outer" relative to the contour of the corresponding component itself. Furthermore, the terms "first," "second," etc., used in this disclosure are for distinguishing one element from another and do not have sequential or importance implications. Additionally, in the following description, when referring to the accompanying drawings, unless otherwise explained, the same reference numerals in different drawings denote the same or similar elements. The above definitions are for explanation and illustration only and should not be construed as limiting this disclosure.

[0023] This disclosure provides a hydraulic cylinder for a diaphragm compressor, referenced... Figure 1 As shown, the cylinder for the diaphragm compressor includes: a cylinder body 1 with an internal mounting hole 11; and a plunger sleeve 2, which is a shape memory alloy and has a first memory state and a second memory state. When the plunger sleeve 2 is in the first memory state, the plunger sleeve 2 presents a first memory size so that the plunger sleeve 2 is interference-fitted into the mounting hole 11; when the plunger sleeve 2 contacts the cooling medium so that the plunger sleeve 2 is in the second memory state, the plunger sleeve 2 presents a second memory size so that the plunger sleeve 2 disengages from the mounting hole 11.

[0024] Through the above technical solution, in the diaphragm compressor cylinder provided in this disclosure, the plunger sleeve 2 is constructed as a shape memory alloy part, and has a first memory state and a second memory state. In the first memory state, the plunger sleeve 2 presents a first memory size that is interference-fitted into the mounting hole 11. When in contact with the cooling medium, the plunger sleeve 2 is affected by the cooling medium and switches to the second memory state, presenting a second memory size that can be detached from the mounting hole 11. Thus, when it is necessary to remove the plunger sleeve 2 from the mounting hole 11 in the cylinder body 1, the plunger sleeve 2 can be switched to the second memory state by contacting the plunger sleeve 2 with the cooling medium. At this time, the plunger sleeve 2 presents a second memory size, which makes the outer diameter of the plunger sleeve 2 smaller than the inner diameter of the mounting hole 11, thereby making it easy to remove the plunger sleeve 2 from the mounting hole 11 of the cylinder body 1. Furthermore, when the plunger sleeve 2 needs to be interference-fitted into the mounting hole 11 of the cylinder block 1, the plunger sleeve 2 can first switch to a second memory state and exhibit a second memory size by contacting the cooling medium. Then, the plunger sleeve 2 exhibiting the second memory size is placed in the mounting hole 11 of the cylinder block 1. Subsequently, at ambient temperature, the plunger sleeve 2 gradually switches from the second memory state to the first memory state. At the same time, the size of the plunger sleeve 2 also gradually recovers from the second memory size to the first memory size, and finally is interference-fitted into the mounting hole 11 of the cylinder block 1. Therefore, by utilizing the memory characteristics of the plunger sleeve 2 as a shape memory alloy part, this disclosure not only makes it easy to remove the plunger sleeve 2 from the mounting hole 11 of the cylinder block 1, but also simplifies and facilitates the process of interference-fitting the plunger sleeve 2 into the mounting hole 11 of the cylinder block 1.

[0025] It should be noted that, in this disclosure, the shape memory alloy used to manufacture the plunger sleeve 2 can be any suitable material. Optionally, the shape memory alloy used to manufacture the plunger sleeve 2 can be a nickel-titanium alloy. In order for the plunger sleeve 2 made of the nickel-titanium alloy to exhibit a first shape memory size in a first shape memory state and a second shape memory size in a second shape memory state, the nickel-titanium alloy needs to be subjected to repeated heating / cooling and deformation treatments so that the nickel-titanium alloy ultimately has a two-way shape memory effect. That is, at ambient temperature, the plunger sleeve 2 made of the nickel-titanium alloy exhibits a first shape memory size, while when in contact with a cooling medium, the plunger sleeve 2 made of the nickel-titanium alloy exhibits a second shape memory size. In this way, the plunger sleeve 2 can exhibit different sizes as required by placing it at ambient temperature or the temperature of the cooling medium.

[0026] It should also be noted that the ambient temperature mentioned in this disclosure usually refers to -20°C to 40°C, and the cooling medium can usually be liquid nitrogen in engineering, or any other cooling medium that can achieve the purpose of this invention. This disclosure does not limit the cooling medium in this regard.

[0027] In the specific embodiments provided in this disclosure, reference is made to Figure 1 As shown, the hydraulic cylinder for the diaphragm compressor also includes a plunger 3 disposed inside the plunger sleeve 2 and reciprocating axially relative to the plunger sleeve 2. When the plunger sleeve 2 is in the first memory state, a fitting gap is formed between the plunger 3 and the plunger sleeve 2. A sealing element 4 is disposed in the fitting gap. Through this arrangement, the fitting gap can be sealed so that the hydraulic oil in the oil chamber 6 of the hydraulic cylinder for the diaphragm compressor will not leak out from the fitting gap when the plunger 3 reciprocates axially relative to the plunger sleeve 2.

[0028] The seal 4 can be constructed in any suitable manner. Optionally, the seal 4 is constructed as a sealing ring 41, with an annular groove 31 formed circumferentially on the outer wall of the plunger 3. The sealing ring 41 is installed in the annular groove 31 to close the fitting gap between the plunger 3 and the plunger sleeve 2. This arrangement reduces the space occupied by the sealing structure between the plunger 3 and the plunger sleeve 2 in the fitting gap, thereby reducing the resistance encountered by the plunger 3 during the reciprocating motion relative to the plunger sleeve 2, and ultimately enabling the plunger 3 to reciprocate more flexibly relative to the plunger sleeve 2.

[0029] In the specific embodiments provided in this disclosure, the first memory size includes the original size and the deformed size, and the fit clearance includes the first fit clearance and the second fit clearance. When the plunger sleeve 2 presents its original size, the plunger sleeve 2 is interference-fitted into the mounting hole 11, and the first fit clearance is formed between the plunger 3 and the plunger sleeve 2. When the plunger sleeve 2 is deformed to present its deformed size, the plunger sleeve 2 is interference-fitted into the mounting hole 11, and the second fit clearance is formed between the plunger 3 and the plunger sleeve 2. Here, when the plunger sleeve 2 is placed in the mounting hole 11 in the cylinder block 1 and away from the cooling medium, under the influence of the ambient temperature, the plunger sleeve 2 will gradually recover its first memory size and be interference-fitted into the mounting hole 11. At this time, since the area around the plunger sleeve 2 is still maintained at the ambient temperature, the shape and size of the plunger sleeve 2 presenting the first memory size remain constant. Therefore, the first memory size of the plunger sleeve 2 in this state is also called the original size. At the same time, the fit clearance formed between the plunger sleeve 2 and the plunger 3 is called the first fit clearance. When the plunger sleeve 2 is affected by other external temperatures, although it still exhibits the first memory size of an interference fit within the mounting hole 11 of the cylinder block 1, its size will slightly deform compared to its original size due to the influence of these external temperatures. Therefore, the first memory size of the plunger sleeve 2 in this state is called the deformed size, and the corresponding fit clearance between the plunger sleeve 2 and the plunger 3 is called the second fit clearance. Here, the deformed size can be larger or smaller than the original size, depending on the specific circumstances. It should be noted that "other external temperatures" refers to temperatures different from the ambient temperature. At these temperatures, the plunger sleeve 2 not only can be interference-fitted into the mounting hole 11 of the cylinder block 1, but also, according to the principle of thermal expansion and contraction, its volume will slightly expand or contract, resulting in a slight increase or decrease in its size.

[0030] The deformation dimensions include contraction deformation dimensions and expansion deformation dimensions. The second fitting clearance includes a contraction clearance and an expansion clearance. When the plunger sleeve 2 contracts to exhibit a contraction deformation dimension, a contraction clearance is formed between the plunger 3 and the plunger sleeve 2. When the plunger sleeve 2 expands to exhibit an expansion deformation dimension, an expansion clearance is formed between the plunger 3 and the plunger sleeve 2. The contraction clearance is greater than the first fitting clearance, and the first fitting clearance is greater than the expansion clearance. With this setting, the plunger sleeve 2 can exhibit different deformation dimensions under different conditions to change the size of the second fitting clearance between the plunger 3 and the plunger sleeve 2. In actual use, the second fitting clearance can be flexibly adjusted according to the required size so that the plunger sleeve 2 exhibits different deformation dimensions corresponding to different second fitting clearances.

[0031] In the specific embodiments provided in this disclosure, reference is made to Figure 1As shown, when the diaphragm compressor cylinder is working, as the discharge pressure increases, the pressure of the hydraulic oil in the oil chamber 6 increases synchronously. The clearance between the plunger sleeve 2 and the plunger 3 also needs to gradually decrease accordingly. However, under normal circumstances, the clearance between the plunger 3 and the plunger sleeve 2 is set to a fixed size. Furthermore, to ensure reliable sealing of the cylinder, this fixed size needs to be the minimum clearance corresponding to the maximum discharge pressure. This results in the plunger 3 reciprocating axially relative to the plunger sleeve 2, which not only exacerbates the wear of the seal 4 between the plunger 3 and the plunger sleeve 2, but also leads to the oil chamber 6... The risk of hydraulic oil leakage increases, and the energy consumption of the diaphragm compressor also increases. In addition, this also increases the possibility of contact damage and tearing between the plunger 3 and the plunger sleeve 2. Therefore, in order to solve this problem, this disclosure provides a temperature regulating device 5. The temperature regulating device 5 can change the temperature at the same time as the exhaust pressure changes, so that the plunger sleeve 2 exhibits different deformation dimensions at different temperatures, thereby ensuring that the size of the second fitting clearance formed between the plunger 3 and the plunger sleeve 2 meets the sealing requirements of the cylinder corresponding to the current exhaust pressure.

[0032] Specifically, the hydraulic cylinder for the diaphragm compressor also includes a temperature regulating device 5. This device 5 regulates the temperature of the hydraulic oil in the oil chamber 6 of the cylinder body 1 according to the cylinder's exhaust pressure, causing the plunger sleeve 2 to switch between contraction and expansion deformation. When the exhaust pressure is the first exhaust pressure, the temperature regulating device 5 adjusts the temperature of the hydraulic oil in the oil chamber 6 to the first temperature, causing the plunger sleeve 2 to exhibit contraction deformation. When the exhaust pressure is the second exhaust pressure, the temperature regulating device 5 adjusts the temperature of the hydraulic oil in the oil chamber 6 to the second temperature, causing the plunger sleeve 2 to exhibit expansion deformation. The first exhaust pressure is lower than the second exhaust pressure, and both the first and second exhaust pressures range from 20 MPa to 90 MPa. Correspondingly, the first temperature is lower than the second temperature, and both the first and second temperatures range from 10°C to 70°C. The values ​​of the first and second temperatures are measured based on the actual working conditions of the hydraulic cylinder of the diaphragm compressor. Within this temperature range, the expansion or contraction deformation of the plunger sleeve 2 can meet the dimensional requirements of the second fitting clearance when the first and second exhaust pressures of the hydraulic cylinder of the diaphragm compressor vary within the pressure range of 20MPa-90MPa. It should be noted that the first or second exhaust pressure can be 20MPa, 30MPa, 40MPa, 50MPa, 60MPa, 70MPa, 80MPa, or 90MPa, or any pressure value within the aforementioned range; this disclosure does not limit this. Similarly, the first or second temperature can be 10℃, 20℃, 30℃, 40℃, 50℃, 60℃, or 70℃, or any temperature value within the aforementioned range; this disclosure does not limit this.

[0033] In the specific embodiments provided in this disclosure, reference is made to Figure 1 As shown, the temperature regulating device 5 includes a pressure detector 51, a temperature regulator 52, and a controller 53. The pressure detector 51 and the temperature regulator 52 are respectively connected to the controller 53. The pressure detector 51 is used to detect the exhaust pressure of the cylinder and transmit the pressure signal to the controller 53. The controller 53 controls the temperature change of the temperature regulator 52 according to the pressure signal. With this setting, the temperature regulator 52 can be adjusted according to the current exhaust pressure of the cylinder of the diaphragm compressor, so that the deformation size of the plunger sleeve 2 can be either a shrinkage deformation size or an expansion deformation size according to the working requirements.

[0034] In the specific embodiments provided in this disclosure, the pressure detector 51 and the temperature regulator 52 can be constructed in any suitable manner. Alternatively, reference may be made to... Figure 1As shown, the pressure detector 51 is constructed as a pressure sensor 511, which is installed on the exhaust pipe after the exhaust passage 7 of the cylinder head 10. The temperature regulator 52 includes a heater 521 and a cooler 522. The heater 521 can be an electric heater and is installed in the oil tank 8 of the cylinder. The cooler 522 is installed on the hydraulic oil delivery pipe 9 of the cylinder. The pressure sensor 511, heater 521, and cooler 522 are respectively connected to the controller 53 so that the controller 53 controls the operation of the cooler 522 or heater 521 according to the exhaust pressure detected by the pressure sensor 511. With this setting, the temperature of the hydraulic oil in the oil chamber 6 can be adjusted according to the exhaust pressure of the cylinder for the diaphragm compressor so that the plunger sleeve 2 exhibits the required deformation size at this temperature, and ultimately achieves the second fitting clearance formed between the plunger sleeve 2 and the plunger 3 to meet the sealing requirements of the cylinder for the diaphragm compressor under the current exhaust pressure.

[0035] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0036] 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, this disclosure will not describe the various possible combinations separately.

[0037] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A hydraulic cylinder for a diaphragm compressor, characterized in that, include: The cylinder block has mounting holes formed inside; and The plunger sleeve is a shape memory alloy part and has a first memory state and a second memory state. When the plunger sleeve is in the first memory state, the plunger sleeve presents a first memory size so that the plunger sleeve is interference-fitted into the mounting hole. When the plunger sleeve contacts the cooling medium to place the plunger sleeve in the second memory state, the plunger sleeve presents a second memory size to disengage the plunger sleeve from the mounting hole; The diaphragm compressor cylinder further includes a plunger disposed inside the plunger sleeve and reciprocating relative to the plunger sleeve along the axial direction. When the plunger sleeve is in the first memory state, a fitting gap is formed between the plunger and the plunger sleeve, and a sealing element is disposed in the fitting gap. The first memory size includes the original size and the deformed size, and the fitting clearance includes a first fitting clearance and a second fitting clearance. When the plunger sleeve presents the original size, the plunger sleeve is interference-fitted into the mounting hole and the first fitting clearance is formed between the plunger and the plunger sleeve. When the plunger sleeve deforms to achieve the deformed size, the plunger sleeve is interference-fitted into the mounting hole and a second fitting clearance is formed between the plunger and the plunger sleeve; The deformation dimension includes a shrinkage deformation dimension and an expansion deformation dimension, and the second fitting clearance includes a shrinkage clearance and an expansion clearance. When the plunger sleeve shrinks and deforms to make the plunger sleeve exhibit the shrinkage deformation dimension, the shrinkage clearance is formed between the plunger and the plunger sleeve. When the plunger sleeve expands and deforms to the extent of the expansion deformation, the expansion gap is formed between the plunger and the plunger sleeve. Wherein, the shrinkage gap is larger than the first fitting gap, and the first fitting gap is larger than the expansion gap; The diaphragm compressor cylinder also includes a temperature regulating device, which is used to regulate the temperature of the hydraulic oil in the oil chamber of the cylinder according to the exhaust pressure of the cylinder so that the plunger sleeve switches between the shrinkage deformation size and the expansion deformation size. When the exhaust pressure is the first exhaust pressure, the temperature regulating device adjusts the temperature of the hydraulic oil in the oil chamber to the first temperature so that the plunger sleeve exhibits the shrinkage deformation size; When the exhaust pressure is the second exhaust pressure, the temperature regulating device adjusts the temperature of the hydraulic oil in the oil chamber to the second temperature so that the plunger sleeve exhibits the expansion deformation size; Wherein, the first exhaust pressure is less than the second exhaust pressure, and the first temperature is less than the second temperature.

2. The hydraulic cylinder for a diaphragm compressor according to claim 1, characterized in that, The sealing element is constructed as a sealing ring, and an annular groove is formed circumferentially on the outer side wall of the plunger. The sealing ring is installed in the annular groove to seal the fitting gap between the plunger and the plunger sleeve.

3. The hydraulic cylinder for a diaphragm compressor according to claim 1, characterized in that, The temperature regulation device includes a pressure detector, a temperature regulator, and a controller. The pressure detector and the temperature regulator are respectively communicatively connected to the controller. The pressure detector is used to detect the exhaust pressure of the cylinder and transmit the pressure signal to the controller. The controller controls the temperature change of the temperature regulator according to the pressure signal.

4. The hydraulic cylinder for a diaphragm compressor according to claim 3, characterized in that, The pressure detector is configured as a pressure sensor, which is installed on the exhaust pipe after the exhaust passage of the cylinder head; the temperature regulator includes a heater and a cooler, the heater is installed in the oil tank of the cylinder, and the cooler is installed on the hydraulic oil delivery pipe of the cylinder. The pressure sensor, the heater, and the cooler are respectively communicatively connected to the controller so that the controller controls the operation of the cooler or the heater according to the exhaust pressure detected by the pressure sensor.

5. The hydraulic cylinder for a diaphragm compressor according to claim 3 or 4, characterized in that, The values ​​of the first exhaust pressure and the second exhaust pressure are both in the range of 20MPa-90MPa.

6. The hydraulic cylinder for a diaphragm compressor according to claim 5, characterized in that, The values ​​of both the first temperature and the second temperature are in the range of 10℃-70℃.

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