A diaphragm-type hydrogen compression device

Abstract

The application relates to the technical field of compressors and discloses a diaphragm type hydrogen compression equipment, in order to solve the problem that an operator cannot easily find the leakage of a diaphragm, a relief valve body is communicated to the side of an air pressure assembly; when hydraulic oil in a hydraulic assembly is pushed into the air pressure assembly, the hydraulic oil pushes the diaphragm to compress hydrogen; at the same time, the excess hydraulic oil flows back to an oil tank from the relief valve body; when the relief piston goes up, the relief piston contacts a detection switch, the detection switch sends a signal to a control unit; if the control unit receives the signal within a compression cycle, it is indicated that the diaphragm has not leaked; otherwise, if the diaphragm leaks, the hydraulic oil will pass through the diaphragm, and the detection switch will not send a signal to the control unit; the control unit judges that the diaphragm has leaked and gives an alarm, and finally, the effect of leakage detection is achieved.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and in particular to a diaphragm-type hydrogen compression device. Background Technology

[0002] A diaphragm hydrogen compressor is a reciprocating positive displacement compression device specifically designed for hydrogen operation. Its core feature is that it uses multi-layer metal diaphragms to completely isolate hydrogen from the hydraulic lubrication system, thereby achieving high-purity oil-free compression and ensuring that the output gas is not contaminated by lubricating oil.

[0003] During compressor operation, the diaphragm is subjected to continuous cyclic alternating stress, and its failure mode is mainly mechanical fatigue. Engineering practice shows that diaphragm cracks usually start at the outermost edge and middle part of the support plate and spread circumferentially. Once the diaphragm ruptures, hydraulic oil will leak to the compressed gas side through the damaged area, which will not only contaminate the high-purity hydrogen medium, but may also cause serious damage to downstream process equipment.

[0004] Currently, the detection of diaphragm leaks mainly relies on manual inspection after shutdown. This involves visual inspection, endoscopic observation, or spraying soapy water onto suspected areas and observing bubbles to determine if the diaphragm is damaged after the compressor has been stopped and depressurized. However, this method cannot monitor the diaphragm's condition during equipment operation, and the detection cycle is long, making it difficult to detect early, minute leaks and resulting in a significant early warning lag. Summary of the Invention

[0005] This invention proposes a diaphragm-type hydrogen compression device with the advantage of leak detection, which solves the problem mentioned in the background art that operators are not likely to detect diaphragm leaks.

[0006] To achieve the above objectives, this application adopts the following technical solution: a diaphragm-type hydrogen compression device, characterized in that it comprises: a base, a crankcase fixedly mounted on the side, a hydraulic assembly fixedly mounted at one end of the crankcase, and a pneumatic assembly mounted on the hydraulic assembly; a diaphragm fixedly mounted in the middle of the inner cavity of the pneumatic assembly, the left chamber of the diaphragm communicating with the chamber of the hydraulic assembly, and the right chamber communicating with a gas tank fixed on the base via a gas distribution assembly; an oil tank fixedly mounted on the side of the crankcase, and the side of the oil tank communicating with the hydraulic assembly via an oil inlet pipe; an overflow pipe fixedly mounted on the side of the pneumatic assembly and communicating with the left chamber of the diaphragm; an overflow valve body fixedly mounted on the top of the overflow pipe, and an overflow piston sealed inside the overflow valve body, with an overflow spring fixedly connected between the top of the overflow piston and the top of the inner side of the overflow valve body; and a return oil pipe. Fixedly connected to the side of the overflow valve body and connected to the oil tank; a detection switch, fixed to the top of the overflow valve body, is electrically connected to the control unit; when the hydraulic assembly supplies hydraulic oil to the left side of the diaphragm and the diaphragm is in good condition, excess hydraulic oil enters the inner cavity of the overflow valve body and pushes the overflow piston upward against the pressure of the overflow spring. The upward movement of the overflow piston triggers the detection switch, and at the same time, the blockage of the return oil pipe is released, allowing the excess hydraulic oil to flow back to the oil tank through the return oil pipe. The detection switch sends an activation signal to the control unit; when the diaphragm leaks, hydraulic oil passes through the leak area of ​​the diaphragm and enters the gas compression side chamber on the right side of the diaphragm. Effective pressure cannot be established in the hydraulic oil side chamber, and the overflow piston cannot move upward to the predetermined position to trigger the detection switch. If the control unit does not receive an activation signal within a predetermined time, it determines that the diaphragm has leaked.

[0007] Furthermore, the bottom of the overflow piston has a downward-facing cylindrical groove.

[0008] Furthermore, an inner sleeve that is sealed to the outside of the overflow pipe is fixedly installed on the top of the inner side of the overflow piston, and a separation hole communicating with the inner cavity of the overflow piston is opened on the top of the inner sleeve; a photoelectric liquid level switch that extends into the inner cavity of the overflow piston is fixedly installed on the top of the overflow piston.

[0009] Furthermore, during normal operation, hydraulic oil enters the annular chamber through the separation hole and fills the oil reservoir. The photoelectric level switch is immersed in the hydraulic oil and does not send a signal to the control unit. When a slight leak occurs in the diaphragm, the leaked hydrogen gas enters the inner sleeve through the overflow pipe and enters the inner cavity of the overflow piston along with the hydraulic oil through the separation hole. The hydrogen gas accumulates at the top of the overflow piston and causes the hydraulic oil level in the inner cavity of the overflow piston to drop. When the level drops below the photoelectric level switch, the photoelectric level switch sends an activation signal to the control unit, which then determines that the diaphragm has leaked.

[0010] Furthermore, a small reflux hole is provided on the side of the overflow pipe for connecting the inner cavity of the overflow pipe with the bottom of the inner cavity of the overflow valve body.

[0011] Furthermore, an oil replenishment tank is fixedly connected to the side of the overflow valve body, and a detection hole is opened on the side of the overflow piston. After the overflow spring pushes the overflow piston down to the bottom, the detection hole is connected to the oil replenishment tank.

[0012] Furthermore, an inner ring sleeve is fixedly installed at the bottom inside the overflow valve body, and a damping hole and a one-way valve are provided on the side of the inner ring sleeve.

[0013] The beneficial effects of this invention are as follows:

[0014] This invention provides a diaphragm-type hydrogen compression device. By connecting an overflow valve body to the side of the pressure assembly and configuring a detection switch within the overflow valve body, reliable monitoring of diaphragm leakage is achieved. Specifically, when the hydraulic assembly pushes hydraulic oil into the pressure assembly, the hydraulic oil drives the diaphragm to compress hydrogen. Simultaneously, excess hydraulic oil flows back to the oil tank through the overflow valve body. During the upward movement of the overflow piston, the piston triggers the detection switch, which then sends a signal to the control unit. If the control unit continuously receives this signal after the hydraulic assembly completes a full compression cycle, it indicates that the diaphragm is in good condition. Conversely, if the diaphragm ruptures, hydraulic oil will leak through the rupture, preventing the overflow piston from moving upward normally, and the detection switch will also be unable to input a signal to the control unit. Based on this, the control unit determines that the diaphragm has leaked and issues an alarm in a timely manner. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort:

[0016] Figure 1 This is a schematic diagram of the overall external three-dimensional structure of the present invention;

[0017] Figure 2 This is a schematic diagram of the overall internal partial cross-sectional planar structure of the present invention;

[0018] Figure 3 This is a three-dimensional cross-sectional view of the internal structure of the overflow valve body of the present invention;

[0019] Figure 4 This is a schematic diagram of the internal planar cross-sectional structure of the overflow valve body of the present invention;

[0020] Figure 5 This is a schematic diagram of the hydraulic oil in the shutdown state of the present invention;

[0021] Figure 6 This is a schematic diagram of the hydraulic oil flow state when the diaphragm of the present invention leaks;

[0022] Figure 7 This is a schematic diagram of the hydraulic oil flow state during the hydrogen compression stage of this invention.

[0023] Figure 8 This is a schematic diagram of the hydraulic oil flow state when the diaphragm of the present invention is operating normally and when a small amount of leakage occurs.

[0024] In the diagram: 1. Base; 2. Crankcase; 3. Hydraulic assembly; 4. Pneumatic assembly; 401. Diaphragm; 5. Air distribution assembly; 6. Air tank; 7. Oil tank; 701. Oil inlet pipe; 702. Oil return pipe; 8. Overflow valve body; 801. Damping orifice; 802. Inner ring sleeve; 9. Detection switch; 10. Overflow spring; 11. Overflow piston; 110. Detection hole; 12. Oil replenishment tank; 13. Overflow pipe; 131. Return orifice; 14. Inner sleeve; 142. Separation hole; 15. Photoelectric level switch. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Example 1, please refer to Figure 1 and Figure 2 It can be seen that the base 1 can be securely placed in the required position using bolts. A crankcase 2 is bolted to the side of the base 1. A hydraulic assembly 3 is fixedly installed at one end of the crankcase 2, and a pneumatic assembly 4 is fixedly installed at the end of the hydraulic assembly 3. Figure 2It can be seen that a diaphragm 401 is fixedly installed in the middle of the inner cavity of the pneumatic assembly 4. The inner cavity of the pneumatic assembly 4, located to the left of the diaphragm 401, is connected to the chamber of the hydraulic assembly 3. The inner cavity of the pneumatic assembly 4, located to the right of the diaphragm 401, is connected to the gas tank 6 fixed on the base 1 via the gas distribution assembly 5. Furthermore, the gas distribution assembly 5 is connected to the gas tank 6 via one pipe, and another pipe is connected to the hydrogen source and the inner cavity of the pneumatic assembly 4 via a one-way valve. An oil tank 7 is fixedly installed on the side of the crankcase 2, and the side of the oil tank 7 is connected to the hydraulic assembly 3 via an oil inlet pipe 701. It should be noted that the crankcase 2 is responsible for converting rotational motion into reciprocating motion and providing lubrication, while the hydraulic assembly 3 transmits this mechanical energy to the diaphragm through hydraulic oil. The two work together to complete the compression of hydrogen. Specifically, the crankcase 2 integrates core transmission components such as the crankshaft, connecting rod, and crosshead; the hydraulic assembly 3 mainly consists of a hydraulic cylinder, hydraulic piston, oil circuit, and oil inlet valve. The motor drives the crankshaft to rotate, which, through the connecting rod and crosshead, converts the rotational motion into the reciprocating linear motion of the hydraulic piston. When the piston moves forward, it compresses the hydraulic oil in the hydraulic cylinder, increasing its pressure. The high-pressure hydraulic oil pushes the diaphragm 401 towards the gas side of the pneumatic assembly 4, compressing the hydrogen in the gas chamber of the pneumatic assembly 4. The compressed hydrogen is then fed into the gas tank 6 through the gas distribution assembly 5. When the piston retracts, the oil pressure decreases, and the diaphragm resets under its own elasticity and the intake pressure. Hydrogen enters the right chamber of the diaphragm 401 through the gas distribution assembly 5, enabling the next intake. Simultaneously, the retracting piston draws in the oil inlet pipe 701, supplying hydraulic oil. The above describes the current structure and working process of a diaphragm compressor. Other details will not be elaborated upon here.

[0027] In this first embodiment, the overflow valve body 8 is modified to detect whether the diaphragm 401 is leaking. Specifically, from... Figure 2It can be seen that an overflow pipe 13, which communicates with the left chamber of the diaphragm 401, is fixedly installed on the side of the pneumatic assembly 4. An overflow valve body 8 is fixedly connected to the top of the overflow pipe 13. An overflow piston 11 is sealed inside the overflow valve body 8. An overflow spring 10 is fixedly connected between the top of the overflow piston 11 and the top of the inner side of the overflow valve body 8. A return oil pipe 702 is fixedly connected to the side of the overflow valve body 8. The return oil pipe 702 is connected to the oil tank 7. When the hydraulic assembly 3 presses hydraulic oil into the left chamber of the diaphragm 401, the increase in hydraulic oil in the left inner chamber of the pneumatic assembly 4 will cause the diaphragm 401 to compress the hydrogen in the right inner chamber of the pneumatic assembly 4 to the right. Excess hydraulic oil in the left inner chamber of the pneumatic assembly 4 enters the inner chamber of the overflow valve body 8 through the overflow pipe 13 and pushes the overflow piston 11 upward. Under normal conditions, the overflow piston 11 is pushed down by the overflow spring 10 and blocks the return oil pipe 702 with its side. When the pressure at the bottom of the overflow piston 11 increases, the overflow piston 11 moves up to compress the spring. The upward overflow piston 11 connects the return oil pipe 702 with the inner cavity of the overflow valve body 8. Excess hydraulic oil in the inner cavity of the overflow valve body 8 flows back to the oil tank 7 through the return oil pipe 702.

[0028] Based on this, combined Figure 2It can be seen that a detection switch 9 is fixedly installed on the top of the overflow valve body 8. The detection switch 9 is generally electrically connected to the control unit, which is preferably a programmable controller. Under normal conditions, the diaphragm 401 is in a relatively sealed state. Thus, when the hydraulic oil in the left inner cavity of the pneumatic assembly 4 increases, the overflow piston 11 will rise and connect the return oil pipe 702 and the inner cavity of the overflow valve body 8. At the same time, the rising overflow piston 11 will contact the detection switch 9, and the detection switch 9 will input an on signal to the control unit. Based on this signal, the control unit can determine that the overflow piston 11 has risen and contacted the detection switch 9, and infer that there is no leakage problem with the diaphragm 401. Based on this, in this embodiment, when the crankcase 2 uses the hydraulic assembly 3 to compress the hydrogen in the pneumatic assembly 4, the overflow piston 11 will periodically contact the detection switch 9, and the detection switch 9 will also periodically input an electrical signal to the control unit. Thus, after the control unit receives the on signal of the detection switch 9 within a set time (i.e., one compression cycle of the pneumatic assembly 4), it indicates that the diaphragm 401 is working normally and there is no leakage. Conversely, if diaphragm 401 leaks, the hydraulic assembly 3 forces hydraulic oil into the left inner cavity of the pneumatic assembly 4. The hydraulic oil then flows directly into the right inner cavity of the pneumatic assembly 4 through the leak in diaphragm 401. Therefore, the hydraulic oil cannot push the overflow piston 11 upwards, and the overflow piston 11 cannot contact the detection switch 9. The detection switch 9 will also be unable to input an on signal to the control unit within one cycle of the pneumatic assembly 4. Based on this, the control unit determines that diaphragm 401 is leaking. Finally, when the control unit determines that diaphragm 401 is leaking, it will input a stop signal to the drive source such as the motor that provides power to crankcase 2, and simultaneously send a start signal to the alarm unit. The alarm unit will issue a warning signal to the operator, informing them that diaphragm 401 is leaking and needs repair or replacement.

[0029] Example 2 is a further improvement on Example 1. Please refer to Example 1. Figure 3 and Figure 4 It can be seen that the bottom of the overflow piston 11 has a downward-opening cylindrical groove, and an inner sleeve 14, which is sealed to the outside of the overflow pipe 13, is fixedly installed on the top inner side of the overflow piston 11. The top of the inner sleeve 14 has a separation hole 142 communicating with the inner cavity of the overflow piston 11. Furthermore, from... Figure 4 It can be seen that a photoelectric liquid level switch 15 is fixedly installed on the top of the overflow piston 11 and extends into the inner cavity of the overflow piston 11. The photoelectric liquid level switch 15 is a device that realizes liquid level detection based on the principle of light refraction and reflection. The core uses an infrared light-emitting element and a photosensitive receiver to sense changes in the liquid level and outputs a switch signal to complete liquid level control or alarm.

[0030] In actual application of this second embodiment, the working status is as follows:

[0031] Initially, sufficient hydraulic oil is injected into the inner cavity of the overflow piston 11, that is... Figure 5 The state shown.

[0032] When hydraulic component 3 pressurizes hydraulic oil into the left inner cavity of pneumatic component 4, the increased hydraulic oil volume in the left inner cavity of pneumatic component 4 first pushes diaphragm 401 to compress hydrogen in the right chamber of pneumatic component 4. Excess hydraulic oil enters the inner cavity of inner sleeve 14 through overflow pipe 13 and flows into the inner cavity of overflow piston 11 through separation hole 142. As the hydraulic oil volume in the inner cavity of overflow piston 11 increases, the hydraulic oil pushes overflow piston 11 upward until overflow piston 11 releases the blockage of return oil pipe 702. Afterward, the hydraulic oil flowing into the inner cavity of overflow piston 11 returns to oil tank 7 through return oil pipe 702. Figure 7 The state shown. Since the inner sleeve 14 continuously supplies hydraulic oil into the inner cavity of the overflow piston 11, the photoelectric level switch 15 will also be completely immersed in the hydraulic oil, and will not send an on signal to the control unit. When the crankcase 2 performs relative suction on the left inner cavity of the pneumatic assembly 4 through the hydraulic assembly 3, due to the reduced pressure in the left inner cavity of the pneumatic assembly 4, on the one hand, the diaphragm 401 will reset to the left; on the other hand, the spring above the overflow piston 11 will push the overflow piston 11 downwards, causing the overflow piston 11 to block the return oil pipe 702 again; simultaneously, combined with... Figure 4 It is known that during the downward movement of the overflow piston 11, some of the hydraulic oil present below the overflow piston 11 returns to the inner cavity of the inner sleeve 14 through the separation hole 142. In this way, during the downward movement of the overflow piston 11, the photoelectric level switch 15 is still immersed in the hydraulic oil, thereby ensuring that the photoelectric level switch 15 will not output false alarm signals to the control when the diaphragm 401 is working normally.

[0033] If a minor leak occurs in diaphragm 401 during operation, the leak is insufficient to cause all the hydraulic oil in the left inner cavity of pneumatic assembly 4 to flow into the right inner cavity of pneumatic assembly 4, as described in Embodiment 1. Subsequently, when crankcase 2 drives hydraulic assembly 3 to return to its original position and draws suction from the left chamber of pneumatic assembly 4, the pressure in the left inner cavity of pneumatic assembly 4 is relatively lower than the pressure in the right chamber, and hydrogen gas has a certain initial pressure when supplied to the right chamber of pneumatic assembly 4 via gas distribution assembly 5. Ultimately, during the leftward return of hydraulic assembly 3, hydrogen gas from the right side of diaphragm 401 flows into the left chamber of diaphragm 401 through the leak. Since the density of hydrogen gas is relatively lower than that of hydraulic oil, and overflow pipe 13 is located at the top of the left inner cavity of pneumatic assembly 4, the hydrogen gas entering the left chamber of diaphragm 401 will flow into the inner cavity of inner sleeve 14 along overflow pipe 13. Subsequently, as the crankcase 2 pushes the hydraulic assembly 3 to squeeze the hydraulic oil in the left chamber of the pneumatic assembly 4 again, a small amount of hydraulic oil will leak into the right chamber of the pneumatic assembly 4 through the leak point, while a large amount of lubricating oil will still rise through the overflow pipe 13 and flow into the inner cavity of the inner sleeve 14. During this process, the hydraulic oil simultaneously drives the hydrogen gas to flow, and after being discharged through the separation hole 142 into the inner cavity of the overflow piston 11, due to the different seals between the two, the hydrogen gas entering the inner cavity of the overflow piston 11 will accumulate at the top of the inner cavity of the overflow piston 11, while the hydraulic oil will separate from the gas and flow downward through the inner cavity of the overflow piston 11, and finally be discharged from the return oil pipe 702. If a large amount of hydrogen gas enters the inner cavity of the overflow piston 11, the hydrogen gas height will continuously increase until it pushes the lubricating oil level below the photoelectric liquid level switch 15, i.e. Figure 8 The state shown is as follows. Ultimately, since there is no hydraulic oil at the bottom of the photoelectric level switch 15, the photoelectric level switch 15 will input an activation signal to the control unit. The control system then uses this signal to determine that the hydraulic oil in the inner cavity of the overflow piston 11 is below the overflow piston 11, and determines that the cause may be a leak in the diaphragm 401. Afterwards, the control unit, as described in Embodiment 1, will perform shutdown and alarm actions.

[0034] It should be noted that if the hydrogen gas input into the left inner cavity of the pneumatic assembly 4 is insufficient to ensure that the hydraulic oil in the overflow piston 11 is below the photoelectric level switch 15, as mentioned above, since the hydrogen gas is always at the top of the inner cavity of the overflow piston 11, when the crankcase 2 drives the hydraulic assembly 3 into the next cycle, and the overflow spring 10 pushes the overflow piston 11 downward, the hydrogen gas at the top of the inner cavity of the overflow piston 11 cannot escape. As a result, in the next cycle, when the air drawn into the left chamber of the pneumatic assembly 4 re-enters the inner cavity of the overflow piston 11 through the overflow pipe 13 and the inner sleeve 14, the leaked hydrogen gas will accumulate in the inner cavity of the overflow piston 11 until the hydraulic oil level is below the photoelectric level switch 15, and finally the control unit will perform the shutdown and alarm actions mentioned above.

[0035] Example 3 is a further improvement on Example 2, combining... Figures 2-4 It can be seen that a small return hole 131 is provided on the side of the overflow pipe 13 for communication between the inner cavity of the overflow pipe 13 and the bottom of the inner cavity of the overflow valve body 8. An oil replenishment tank 12 is fixedly connected to the side of the overflow valve body 8, and correspondingly, a detection hole 110 is provided on the side of the overflow piston 11. For example... Figure 4 As shown, when the overflow spring 10 pushes the overflow piston 11 downwards to the bottom, the detection hole 110 connects with the oil replenishment tank 12. It should be noted that the return hole 131 and the detection hole 110 are preferably small holes. Initially, the inner cavity of the oil replenishment tank 12 is filled with sufficient hydraulic oil, i.e. Figure 5 As shown in the diagram. During the machine shutdown phase, if the diaphragm 401 leaks, the hydraulic oil in the cavity of the overflow piston 11 will flow into the overflow pipe 13 through the return hole 131, and then flow from the leak point on the diaphragm 401 into the cavity of the pneumatic assembly 4 through the left cavity of the pneumatic assembly 4. As the hydraulic oil continues to flow out, the hydraulic oil in the replenishment tank 12 is replenished into the cavity of the overflow piston 11 through the detection hole 110. When the hydraulic oil in the replenishment tank 12 is depleted, as the hydraulic oil in the cavity of the overflow piston 11 is continuously discharged outward, the hydraulic oil level in the cavity of the overflow piston 11 will eventually be below the photoelectric level switch 15, i.e. Figure 6 The process is shown. Finally, the photoelectric level switch 15 inputs an activation signal to the control unit, and the control unit performs an alarm. When the crankcase 2 compresses the left inner cavity of the pneumatic assembly 4 via the hydraulic assembly 3, since both the return orifice 131 and the detection orifice 110 are small holes, when too much hydraulic oil is input into the inner sleeve 14 through the overflow pipe 13, the oil pressure increases, forcing the overflow piston 11 to ultimately push upwards, thus achieving the work described in Embodiment 2.

[0036] Furthermore, to prevent the overflow spring 10 from pushing the overflow piston 11 downwards to reset during normal operation, which would cause external air to flow into the inner cavity of the overflow piston 11 after the detection hole 110 connects with the oil replenishment tank 12, thus preventing false alarms from the photoelectric level switch 15 during normal operation, combined with... Figure 4 It can be seen that an inner ring sleeve 802 is fixedly installed on the bottom inner side of the overflow valve body 8, and a sealing sleeve is fitted between the outer part of the inner ring sleeve 802 and the bottom inner side of the overflow piston 11. A damping hole 801 is provided on the side of the inner ring sleeve 802, and a one-way valve for one-way flow from the inner cavity of the overflow piston 11 to the outer cavity of the inner ring sleeve 802 is provided. In this way, when the crankcase 2 pushes the hydraulic component 3 to periodically compress the hydraulic oil in the inner cavity of the pneumatic component 4, the hydraulic oil under pressure pushes the overflow piston 11 upward. At the same time, when the hydraulic oil flows through the outer part of the inner ring sleeve 802, it will cause the bottom of the inner cavity of the overflow valve body 8 in the outer area of ​​the inner ring sleeve 802 to be filled with hydraulic oil. As the overflow piston 11 rises, the overflow piston 11 turns on the detection switch 9 and realizes the leakage detection mentioned in Embodiment 1; the photoelectric liquid level switch 15 realizes the leakage detection mentioned in Embodiment 2.

[0037] When the crankcase 2 drives the hydraulic assembly 3 to move to the left to resume operation, the overflow spring 10 pushes the overflow piston 11 downward until the bottom of the overflow piston 11 squeezes the hydraulic oil outside the inner ring sleeve 802. Due to the incompressibility of the liquid medium, the hydraulic oil outside the inner ring sleeve 802 can only be slowly discharged from the damping hole 801, thus ensuring that the crankcase 2 drives the hydraulic assembly 3 to work normally. During the cycle, after the overflow piston 11 moves downward and enters the outer part of the inner ring sleeve 802, its movement is blocked, so the detection hole 110 will not be connected to the oil tank 12. Therefore, even during the process of the crankcase 2 driving the hydraulic assembly 3 to move to the left to resume operation, the external air will not be able to enter the inner cavity of the overflow piston 11 through the oil tank 12 and the detection hole 110, and the airflow will also be prevented from entering the inner cavity of the overflow piston 11, causing the photoelectric liquid level switch 15 to perform the alarm action mentioned in Embodiment 2.

[0038] Finally, when the whole machine stops working, the overflow spring 10 continues to push the overflow piston 11 downward. If the diaphragm 401 leaks in the stopped state, the alarm process described in this embodiment three is realized.

[0039] As can be seen from Embodiments 1 to 3, this application can not only trigger an alarm when there is a serious leak in the diaphragm 401, but also detect and trigger an alarm when there is a minor leak in the diaphragm 401 before and after the machine is started.

[0040] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A diaphragm-type hydrogen compression device, characterized in that, include: A base (1) has a crankcase (2) fixedly installed on its side. A hydraulic assembly (3) is fixedly installed at one end of the crankcase (2). A pneumatic assembly (4) is installed on the hydraulic assembly (3). A diaphragm (401) is fixedly installed in the middle of the inner cavity of the pneumatic assembly (4). The left chamber of the diaphragm (401) is connected to the chamber of the hydraulic assembly (3), and the right chamber is connected to the air tank (6) fixed on the base (1) via the air distribution assembly (5). An oil tank (7) is fixedly installed on the side of the crankcase (2), and the side of the oil tank (7) is connected to the hydraulic assembly (3) via the oil inlet pipe (701). An overflow pipe (13) is fixed to the side of the pneumatic assembly (4) and communicates with the left chamber of the diaphragm (401); An overflow valve body (8) is fixed to the top of the overflow pipe (13), and an overflow piston (11) is sealed inside the overflow valve body (8). An overflow spring (10) is fixedly connected between the top of the overflow piston (11) and the top of the inner side of the overflow valve body (8). The return oil pipe (702) is fixedly connected to the side of the overflow valve body (8) and communicates with the oil tank (7); The detection switch (9) is fixed on the top of the overflow valve body (8) and is electrically connected to the control unit; When the hydraulic assembly (3) supplies hydraulic oil to the left side of the diaphragm (401) and the diaphragm (401) is in good condition, excess hydraulic oil enters the inner cavity of the overflow valve body (8) and pushes the overflow piston (11) to overcome the pressure of the overflow spring (10) and move upward. The upward movement of the overflow piston (11) triggers the detection switch (9) and at the same time releases the blockage of the return oil pipe (702) so that the excess hydraulic oil flows back to the oil tank (7) through the return oil pipe (702). The detection switch (9) sends an on signal to the control unit. When the diaphragm (401) leaks, the hydraulic oil passes through the leakage area of ​​the diaphragm (401) and enters the gas compression side chamber on the right side of the diaphragm (401). The hydraulic oil side chamber cannot build up effective pressure, and the overflow piston (11) cannot move upward to the predetermined position to trigger the detection switch (9). When the control unit does not receive the on signal within the predetermined time, it determines that the diaphragm (401) has leaked.

2. The diaphragm-type hydrogen compression device according to claim 1, characterized in that, The bottom of the overflow piston (11) has a downward-facing cylindrical groove.

3. The diaphragm-type hydrogen compression device according to claim 2, characterized in that, An inner sleeve (14) is fixedly installed on the top of the inner side of the overflow piston (11) and is sealed to the outside of the overflow pipe (13). The top of the inner sleeve (14) is provided with a separation hole (142) that communicates with the inner cavity of the overflow piston (11). A photoelectric liquid level switch (15) is fixedly installed on the top of the overflow piston (11) and extends into the inner cavity of the overflow piston (11).

4. The diaphragm-type hydrogen compression device according to claim 1, characterized in that, During normal operation, hydraulic oil enters the annular chamber through the separation hole (142) and fills the oil storage chamber. The photoelectric level switch (15) is immersed in the hydraulic oil and does not send a signal to the control unit. When the diaphragm (401) leaks slightly, the leaked hydrogen enters the inner sleeve (14) through the overflow pipe (13) and enters the inner cavity of the overflow piston (11) through the separation hole (142) with the hydraulic oil. The hydrogen accumulates on the top of the overflow piston (11) and causes the hydraulic oil level in the inner cavity of the overflow piston (11) to drop. When the level drops below the photoelectric level switch (15), the photoelectric level switch (15) sends an on signal to the control unit. The control unit determines that the diaphragm (401) has leaked.

5. The diaphragm-type hydrogen compression device according to claim 3, characterized in that, The side of the overflow pipe (13) is provided with a return hole (131) for communicating between the inner cavity of the overflow pipe (13) and the bottom of the inner cavity of the overflow valve body (8).

6. The diaphragm-type hydrogen compression device according to claim 5, characterized in that, An oil tank (12) is fixedly connected to the side of the overflow valve body (8). A detection hole (110) is opened on the side of the overflow piston (11). After the overflow spring (10) pushes the overflow piston (11) down to the bottom, the detection hole (110) is connected to the oil tank (12).

7. The diaphragm-type hydrogen compression device according to claim 6, characterized in that, An inner ring sleeve (802) is fixedly installed on the bottom inner side of the overflow valve body (8). The inner ring sleeve (802) has a damping hole (801) and a one-way valve on its side.

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