Hydraulic oil supplementing system and method for diaphragm compressor

Abstract

According to the hydraulic oil supplementing system and method of the diaphragm compressor, a control module judges that an oil discharging pressure signal is smaller than a preset alarm threshold value of low oil discharging pressure, an exhaust pressure signal is smaller than a preset alarm threshold value of low exhaust pressure, and an exhaust flow signal is larger than a preset alarm threshold value of high exhaust flow; and if yes, the control module transmits the action instruction to the executing mechanism, and the executing mechanism automatically rotates an adjusting screw cap on the oil supplementing plunger pump to enable the adjusting screw cap to move towards the eccentric sleeve so as to increase the movement stroke of the plunger, so that the oil supplementing amount of the oil supplementing plunger pump is increased. Under the condition that the diaphragm compressor is not stopped and cylinder head parts are not disassembled, the oil supplementing amount of the oil supplementing plunger pump can be adjusted on line so as to supplement hydraulic oil with increased leakage caused by failure of a piston sealing element of the diaphragm compressor or reduction of sealing performance, the large workload caused by stopping to replace the sealing element is reduced, and the working efficiency is improved. And economic loss caused by shutdown is avoided.

Description

Technical Field

[0001] The invention relates to the field of diaphragm compressors, and in particular to a hydraulic oil replenishing system and a replenishing method for a diaphragm compressor. Background Art

[0002] The diaphragm compressor is a special volumetric compressor. It is the highest level compression method in the field of gas compression. It has the characteristics of large compression ratio, good sealing, and compressed gas is not contaminated by lubricating oil and other solid impurities. It is widely used in compressing and conveying various high-purity gases, precious rare gases, toxic and harmful gases, and corrosive gases. As an irreplaceable volumetric compressor, it will be more widely used with the progress and development of science and technology and the continuous improvement of people's living standards. The diaphragm compressor uses the piston rod to push the hydraulic oil to achieve the pressurization of the compressed gas. There is a gap fit between the piston rod and the cylinder liner. In order to reduce the leakage of hydraulic oil from the gap between the piston rod and the cylinder liner, sealing measures need to be taken. At present, rubber sealing rings are mostly used to achieve sealing. The sealing ring is installed in the ring groove of the piston rod. When working, the outer edge of the sealing ring is close to the mirror surface of the cylinder liner, thereby blocking the leakage of hydraulic oil from the gap. There is a dynamic seal between the piston rod and the cylinder liner. When the diaphragm compressor is running, the outer edge of the sealing ring will be worn. As the running time increases, the wear of the sealing ring will become more serious, thereby weakening the sealing function of the sealing ring and causing an increase in the leakage of hydraulic oil.

[0003] The statements herein merely provide background art related to the present invention and do not necessarily constitute prior art. Summary of the invention

[0004] The object of the present invention is to provide a hydraulic oil replenishing system and replenishing method for a diaphragm compressor, which can adjust the oil replenishing amount of the oil replenishing plunger pump online without stopping the diaphragm compressor and without disassembling the cylinder head components, so as to compensate for the hydraulic oil whose leakage is increased due to the failure of the piston seal of the diaphragm compressor or the weakening of the sealing performance, thereby reducing the increased workload caused by stopping the machine to replace the seal and avoiding the economic losses caused by the shutdown.

[0005] In order to achieve the above object, the present invention provides a hydraulic oil replenishing system for a diaphragm compressor, comprising:

[0006] an oil inlet valve, which is arranged on the housing of the diaphragm compressor and communicated with the oil chamber of the housing, and is used to add hydraulic oil into the oil chamber;

[0007] an oil discharge valve, which is arranged on the housing of the diaphragm compressor, is communicated with the oil chamber of the housing and is communicated with the cylinder of the diaphragm compressor, and is used to replenish the hydraulic oil in the oil chamber into the cylinder of the diaphragm compressor;

[0008] An oil replenishing plunger pump is installed on the housing of the diaphragm compressor and is used to replenish hydraulic oil to the diaphragm compressor. The oil replenishing plunger pump includes a plunger, a plunger sleeve, and a spring. The plunger is arranged in the oil cavity of the housing, and a plunger sleeve is arranged on the plunger. The upper end of the plunger extends out of the oil cavity and contacts the bearing on the eccentric sleeve of the crankshaft of the diaphragm compressor. The eccentric sleeve drives the plunger to move downward through the bearing. A spring is arranged at the lower end of the plunger. The plunger has a stepped portion for cooperating with an adjusting screw cap to limit the plunger.

[0009] An adjusting screw cap is arranged on the housing of the diaphragm compressor and is used to adjust the movement stroke of the plunger. The adjusting screw cap has a cover plate and a limiting portion located below the cover plate. The cover plate and the limiting portion have through holes. The upper end of the plunger passes through the through holes and faces the end face of the bearing on the eccentric sleeve. The limiting portion clamps the stepped portion of the plunger to limit the plunger.

[0010] A data acquisition module is used to obtain the oil discharge and exhaust state data of the diaphragm compressor in real time.

[0011] A control module is connected to the data acquisition module and the oil replenishing plunger pump and is used to adjust the oil replenishing amount of the oil replenishing plunger pump in real time according to the oil discharge and exhaust states of the diaphragm compressor.

[0012] External threads are arranged on the outer wall of the limiting portion, and internal threads are arranged on the inner wall of the housing. The adjusting screw cap and the housing are fixedly connected by threads.

[0013] The hydraulic oil replenishing system further includes an actuator, which automatically rotates the adjusting screw cap according to the action instruction of the control module to adjust the movement stroke of the plunger, thereby adjusting the oil replenishing amount of the oil replenishing plunger pump.

[0014] The diameter of the through hole is 0.5 mm to 1.5 mm larger than the diameter of the plunger.

[0015] The hydraulic oil replenishing system further includes a monitoring terminal, which is connected to the control module and is used to display the oil discharge and exhaust states of the diaphragm compressor in real time.

[0016] The data acquisition module includes:

[0017] An oil discharge pressure acquisition module is arranged on the cylinder block of the diaphragm compressor and is used to collect the oil discharge pressure signal of the diaphragm compressor in real time and transmit it to the control module.

[0018] An exhaust pressure acquisition module is arranged on the exhaust pipeline of the diaphragm compressor and is used to collect the exhaust pressure signal of the diaphragm compressor in real time and transmit it to the control module.

[0019] An exhaust gas flow rate acquisition module, which is arranged on the exhaust pipeline of the diaphragm compressor and is used for acquiring the exhaust gas flow rate signal of the diaphragm compressor in real time and transmitting it to the control module.

[0020] The adjusting screw cap further includes: a plurality of rib plates, the rib plates are connected to the cover plate, and the rib plates are located outside the housing, and the plurality of rib plates are evenly distributed at equal intervals in the circumferential direction.

[0021] The present invention also provides a hydraulic oil replenishing method for a diaphragm compressor, which includes the following steps:

[0022] The control module obtains the oil discharge pressure signal P of the diaphragm compressor acquired in real time by the oil discharge pressure acquisition module, the exhaust gas pressure signal P of the diaphragm compressor acquired in real time by the exhaust gas pressure acquisition module 0 and the exhaust gas flow rate signal G of the diaphragm compressor 1 acquired in real time by the exhaust gas flow rate acquisition module 0 ;

[0023] The control module determines that the oil discharge pressure signal P is less than the preset alarm threshold P for low oil discharge pressure 2 , and the exhaust gas pressure signal P 0 is less than the preset alarm threshold P for low exhaust gas pressure 3 , and the exhaust gas flow rate signal G 0 is greater than the preset alarm threshold G for high exhaust gas flow rate 1 , then the control module transmits an action instruction to the actuator, and the actuator automatically rotates the adjusting screw cap to move it in the direction of the eccentric sleeve until the oil discharge pressure signal P is greater than the preset alarm threshold P for low oil discharge pressure 2 .

[0024] The control module determines that the oil discharge pressure signal P is greater than the preset alarm threshold P for high oil discharge pressure 1 , and the operator needs to check the operating status of the pressure regulating valve and its pipeline of the diaphragm compressor and adjust its unloading pressure to the design value.

[0025] The control module controls the actuator to adjust the adjusting screw cap to move one unit length in the direction of the eccentric sleeve each time, and the unit length is one pitch, or the quotient of a single pitch divided by the total number of rib plates.

[0026] The present invention has the following beneficial effects:

[0027] 1. The structure is simple. It only needs to drill threads on the housing of the oil replenishing plunger pump and install the adjusting screw cap.

[0028] 2. Without shutting down the diaphragm compressor and disassembling the cylinder head components, the oil replenishment amount of the oil replenishing plunger pump can be adjusted online to make up for the hydraulic oil with increased leakage caused by the failure or weakened sealing performance of the piston seal of the diaphragm compressor, reducing the increased workload brought by shutting down for seal replacement and avoiding the economic losses caused by shutdown. Description of the Drawings

[0029] Figure 1 It is a schematic structural diagram of the oil replenishing structure of the diaphragm compressor.

[0030] Figure 2 It is a schematic structural diagram of a hydraulic oil replenishing system for a diaphragm compressor provided by the present invention.

[0031] Figure 3 It is a schematic cross-sectional structural diagram of the oil replenishing plunger pump.

[0032] Figure 4 It is a schematic structural diagram of the adjusting screw cap.

[0033] Figure 5 It is a flowchart of a method for replenishing hydraulic oil of a diaphragm compressor provided by the present invention.

[0034] Description of the Reference Numerals:

[0035] 1: Diaphragm Compressor

[0036] 10: Bearing

[0037] 11: Cylinder Block

[0038] 12: Piston

[0039] 13: Cylinder Head

[0040] 14: Oil Replenishing Plunger Pump

[0041] 15: Crankshaft

[0042] 16: Relief Valve

[0043] 17: Oil Discharge Pressure Acquisition Module

[0044] 18: Exhaust Pressure Acquisition Module

[0045] 19: Exhaust Flow Rate Acquisition Module

[0046] 101: Housing

[0047] 1011: Oil Chamber

[0048] 102: Inlet Valve

[0049] 103: Oil Discharge Valve

[0050] 104: Plunger

[0051] 1041: Step portion

[0052] 105: Plunger sleeve

[0053] 106: Spring

[0054] 107: Adjusting screw cap

[0055] 1071: Cover plate

[0056] 1072: Limiting portion

[0057] 1073: Through hole

[0058] 1074: Rib plate

[0059] 108: Connecting piece Detailed implementation manners

[0060] The following is based on Figures 1 to 5 , and specifically describes the preferred embodiments of the present invention.

[0061] When the sealing ring on the piston rod of the diaphragm compressor is worn, in order to ensure the normal operation of the diaphragm compressor and guarantee the designed exhaust pressure, there are mainly three ways:[[]]

[0062] 1. Stop the operation of the diaphragm compressor, disassemble and replace with a new sealing ring. This method requires shutting down the machine, which not only has a large workload but also causes economic losses.[[]]

[0063] 2. Reduce the gap between the piston rod or the piston and the cylinder liner. This method also requires shutting down the machine and has a large workload.[[]]

[0064] 3. Increase the oil replenishment amount. In each revolution of the diaphragm compressor, oil is replenished to the oil cylinder through an oil replenishing plunger pump to supplement the hydraulic oil leaked from between the piston rod or the piston and the cylinder liner.[[]]

[0065] Such as Figure 1As shown in the figure, when the diaphragm compressor 1 operates, the oil in the hydraulic oil chamber will inevitably leak through the piston 12 in the cylinder block 11. The consequence is equivalent to reducing the piston stroke volume. In this way, when the piston 12 reaches the outer dead center, the diaphragm cannot fit with the cylinder head 13. Leakage occurs in each revolution of the diaphragm compressor. Therefore, as the operation time increases, the liquid in the hydraulic oil chamber will become less and less, which causes the diaphragm to not fit with the cylinder head 13, resulting in the diaphragm compressor being unable to suck in gas and losing its working ability. Therefore, an oil replenishing plunger pump 14 must be provided to replenish hydraulic oil into the hydraulic oil chamber of the diaphragm compressor. The plunger in the oil replenishing plunger pump 14 is driven by a bearing installed on an eccentric sleeve provided on the crankshaft 15, and a certain amount of liquid is replenished into the hydraulic oil chamber of the diaphragm compressor in each revolution. Since it is difficult to ensure that the amount of liquid replenished by the oil replenishing plunger pump 14 is exactly the same as the leakage amount of the liquid in the hydraulic oil chamber of the diaphragm compressor, the replenishing amount of liquid must be greater than the leakage amount. The excess replenishing amount of liquid is equivalent to increasing the stroke of the piston 12, so that the diaphragm touches the surface of the cylinder head 13 before the piston 12 reaches the outer dead center. Since the compressibility of hydraulic oil is very small, the liquid for the remaining piston stroke must be discharged through an overflow valve 16 provided on the oil distribution disc. In a diaphragm compressor, hydraulic oil has compressibility. For example, when mineral oil is increased from 0.1 MPa to 20 MPa, the volume of mineral oil decreases by about 1.4%. When the pressure is increased to 50 MPa, the mineral oil decreases by about 3%. When it is increased to 80 MPa, the volume decreases by 4.3%. When it is increased to 351.5 MPa, the volume reduction will reach 15%. Therefore, using the same replenishing amount of liquid cannot ensure that the diaphragm fits with the lower surface of the cylinder head. This requires replenishing more hydraulic oil in each revolution to make up for the compression amount of hydraulic oil under high pressure. It is selected to replenish oil at a certain position before the piston 12 reaches the inner dead center. When the piston 12 is at the inner dead center, the stroke of the oil replenishing plunger pump 14 reaches the maximum and the oil replenishment is completed. In this way, the oil replenishing plunger pump 14 will work at a corresponding low pressure, which can not only reduce the design difficulty of the oil replenishing system but also improve the operation safety of the diaphragm compressor.

[0066] Based on this, as Figure 2 shown, the present invention provides a hydraulic oil replenishing system for a diaphragm compressor, comprising: an oil inlet valve 102, which is arranged on the housing 101 of the diaphragm compressor 1 and is communicated with the oil chamber 1011 of the housing 101 for adding hydraulic oil into the oil chamber 1011;

[0067] an oil discharge valve 103, which is arranged on the housing 101 of the diaphragm compressor 1, is communicated with the oil chamber 1011 of the housing 101 and is communicated with the cylinder block 11 of the diaphragm compressor 1 for replenishing the hydraulic oil in the oil chamber 1011 into the cylinder block 11 of the diaphragm compressor 1;

[0068] a data acquisition module for real-time obtaining the oil discharge and exhaust state data of the diaphragm compressor 1;

[0069] An oil replenishing plunger pump 14 is installed on the housing 101 of the diaphragm compressor 1 and is used to replenish hydraulic oil into the diaphragm compressor 1; as Figure 3 shown, the oil replenishing plunger pump 14 includes: a plunger 104, a plunger sleeve 105 and a spring 106. The plunger 104 is arranged in the oil chamber 1011 of the housing 101. A plunger sleeve 105 is arranged on the plunger 104. The upper end of the plunger 104 extends out of the oil chamber 1011 and contacts the bearing 10 on the eccentric sleeve of the crankshaft 15 of the diaphragm compressor 1 through a connecting member 108. The eccentric sleeve drives the plunger 104 to move downward through the bearing 10. A spring 106 is arranged at the lower end of the plunger 104, and the spring 106 is also located in the oil chamber 1011. Further, a stepped portion 1041 is provided on the plunger 104 for cooperating with an adjusting screw cap 107 to realize the limit of the plunger 104;

[0070] The adjusting screw cap 107, as Figure 4 shown, is arranged on the housing 101 and is used to limit the position of the plunger 104; the adjusting screw cap 107 has a cover plate 1071 and a limiting portion 1072 located below the cover plate 1071. The cover plate 1071 and the limiting portion 1072 have through holes 1073. The upper end of the plunger 104 passes through the through hole 1073 and faces the end face of the bearing 10 of the eccentric sleeve. In this embodiment, the diameter of the through hole 1073 is 0.5 mm to 1.5 mm larger than the diameter of the plunger 104, so that the plunger 104 can move freely inside the through hole 1073; the limiting portion 1072 catches the stepped portion 1041 of the plunger 104 to realize the limit of the plunger 104. The outer wall of the limiting portion 1072 is provided with external threads. Correspondingly, the inner wall of the housing 101 is provided with internal threads, and the adjusting screw cap 107 and the housing 101 are fixedly connected by threads;

[0071] A control module (not shown in the figure) is connected to the data acquisition module and the oil replenishing plunger pump 14 and is used to adjust the oil replenishing amount of the oil replenishing plunger pump 14 in real time according to the oil discharging and air exhausting states of the diaphragm compressor 1;

[0072] An actuator (not shown in the figure) automatically rotates the adjusting screw cap 107 according to the action instruction of the control module to adjust the volume of the oil chamber 1011, so as to adjust the oil replenishing amount of the oil replenishing plunger pump 14;

[0073] A monitoring terminal (not shown in the figure) is connected to the control module and is used to display the oil discharging and air exhausting states of the diaphragm compressor 1 in real time.

[0074] The data acquisition module includes:

[0075] The oil discharge pressure acquisition module 17 is arranged on the cylinder block 11 of the diaphragm compressor 1 and is used for acquiring the oil discharge pressure signal of the diaphragm compressor 1 in real time and transmitting it to the control module;

[0076] The exhaust pressure acquisition module 18 is arranged on the exhaust pipeline of the diaphragm compressor 1 and is used for acquiring the exhaust pressure signal of the diaphragm compressor 1 in real time and transmitting it to the control module;

[0077] The exhaust flow acquisition module 19 is arranged on the exhaust pipeline of the diaphragm compressor 1 and is used for acquiring the exhaust flow signal of the diaphragm compressor 1 in real time and transmitting it to the control module.

[0078] As Figure 3 shown, the adjusting screw cap 107 is installed on the housing 101 of the oil replenishing plunger pump 14 in a threaded connection form. During the first installation, the adjusting screw cap 107 is screwed down to the bottom, so that the limiting part 1072 of the adjusting screw cap 107 abuts against the step part 1041 of the plunger 104, preventing the plunger 104 from moving upward under the action of the spring 106, which is the top dead center of the plunger. When the diaphragm compressor operates, under the action of the eccentric sleeve, every time the crankshaft rotates one turn, the plunger 104 will move downward, and oil is replenished into the hydraulic cylinder of the diaphragm compressor through the oil discharge valve 103. During the downward movement, the plunger 104 compresses the spring 106 until the plunger 104 moves to the lowest point, which is the bottom dead center of the plunger. When the bearing 10 of the eccentric sleeve is far away from the plunger 104, the plunger 104 moves upward under the action of the spring force. At this time, the hydraulic oil will enter the oil chamber 1011 of the oil replenishing plunger pump 14 from the oil inlet valve 102 until the plunger 104 moves to the top dead center. The oil chamber volume between the top dead center and the bottom dead center is the initial oil replenishment amount. Rotate the adjusting screw cap 107 so that it moves towards the bearing 10 of the eccentric sleeve, then the top dead center of the plunger also moves upward, which is equivalent to increasing the movement stroke of the plunger 104, and the oil chamber volume between the top dead center and the bottom dead center also expands. Correspondingly, the oil replenishment amount of the oil replenishing plunger pump 14 also increases.

[0079] In the embodiment of the present invention, as Figure 4As shown, a plurality of rib plates 1074 are provided on the adjusting screw cap 107. The rib plates 1074 are connected to the cover plate 1071, and the rib plates 1074 are located outside the housing 101. The plurality of rib plates 1074 are evenly distributed at equal intervals in the circumferential direction. Since the rib plates 1074 are evenly distributed, when the adjusting screw cap 107 rotates 360°, the distance that the adjusting screw cap 107 moves in its axial direction is one pitch. According to the number of the rib plates 1074, the angle between two rib plates can be calculated. During the rotation of the adjusting screw cap 107, the rib plates 1074 move accordingly. The axial movement distance of the adjusting screw cap 107 can be calculated by the rotation angle of the rib plates 1074, so as to accurately control the increase amount of the oil supplement of the oil supplement plunger pump 14. The number of the rib plates 1074 is not fixed. The more the number, the more accurate the control angle during installation and the more accurate the control of the axial movement distance of the adjusting screw cap 107. However, the number of rib plates should not be set too many. On the one hand, considering the strength factor, the rib plates cannot be too small. On the other hand, the adjusting screw cap 107 moves one pitch axially when it rotates one circle, and the pitch is already small, so there is no need for too many rib plates. Generally, it is more appropriate to set the number of the rib plates 1074 to 6-10.

[0080] Further, in this embodiment, the actuator includes: a motor, a gear and a control board. A gear is installed on the output shaft of the motor. The gear meshes with the rib plates 1074 on the adjusting screw cap 107. The rotation of the motor is controlled by the control board. When the control board receives an adjustment instruction from the control module, it controls the motor to rotate. The motor drives the gear to rotate, so that the rib plates 1074 push the adjusting screw cap 107 to rotate. The rotation of the adjusting screw cap 107 is converted into an axial displacement, thereby increasing the oil supplement amount.

[0081] As Figure 5 shown, the present invention provides a hydraulic oil supplement method for a diaphragm compressor, including the following steps:

[0082] Step S1: The oil discharge pressure acquisition module 17 collects the oil discharge pressure signal P of the diaphragm compressor 1 in real time and transmits it to the control module; the exhaust pressure acquisition module 18 collects the exhaust pressure signal P of the diaphragm compressor 1 in real time 0 and transmits it to the control module; the exhaust gas flow acquisition module 19 collects the exhaust gas flow signal G of the diaphragm compressor 1 in real time 0 and transmits it to the control module;

[0083] Step S2: The control module judges the difference between the oil discharge pressure signal P and the preset high oil discharge pressure alarm threshold P 1 and the preset low oil discharge pressure alarm threshold P 2 If P<P 2, then step S3 is performed. If P 2 ≤P≤P 1 , it indicates that the diaphragm compressor is operating normally and no oil replenishment is required. If P > P 1 , then step S5 is performed;

[0084] Step S3: The control module determines whether the exhaust pressure is too low (i.e., P 0 <P 3 , P 3 is the preset low exhaust pressure alarm threshold) and whether the exhaust flow rate is too high (i.e., G 0 >G 1 , G 1 is the preset high exhaust flow rate alarm threshold). If so, the oil replenishment amount needs to be increased, and then step S4 is performed;

[0085] Step S4: The control module transmits an action instruction to the actuator, and the actuator automatically rotates the adjusting screw cap 107 to move it towards the bearing 10 of the eccentric sleeve, which is equivalent to increasing the stroke volume of the piston 104, so as to increase the volume of the oil chamber 1011, thereby increasing the oil replenishment amount of the oil replenishment plunger pump 14. Correspondingly, the piston stroke volume of the diaphragm compressor increases, the peak oil pressure increases, and then the exhaust pressure increases; then step S1 is performed; the control module can control the actuator to adjust the adjusting screw cap 107 to move towards the bearing 10 of the eccentric sleeve by a unit length each time, and repeat steps S1 - S4 until P 2 <P<P 1 , and the control module stops alarming; the unit length can be set according to specific conditions. For example, it can be set to a pitch, or according to the number of rib plates, set to the quotient of a single pitch divided by the total number of rib plates;

[0086] Step S5: When the high oil discharge pressure alarm occurs, the operator needs to check the operating status of the pressure regulating valve and its pipeline of the diaphragm compressor, adjust its unloading pressure to the design value, and then perform step S1.

[0087] The present invention can adjust the oil replenishment amount of the oil replenishment plunger pump without stopping the machine or disassembling parts. When the piston seal wears and causes the oil leakage to increase, the hydraulic oil in the hydraulic cylinder is insufficient, which is equivalent to the piston stroke volume being reduced. Then, when the piston is at the bottom dead center, the oil pressure in the hydraulic cylinder will decrease, and the exhaust pressure will decrease accordingly, which is lower than the design value. In order to ensure that the exhaust pressure is maintained at the design level, it is necessary to increase the oil replenishment amount. At this time, the method for adjusting the oil replenishment amount provided by the present invention can realize online adjustment of the oil replenishment amount. The operation is simple. The oil replenishment amount of the oil replenishment plunger pump can be increased without stopping the machine to ensure the piston stroke volume required by the design, thereby ensuring that the exhaust pressure is maintained at the design level, thereby achieving the effect of compensating for the hydraulic oil reduced due to the increase in leakage, reducing the increased workload caused by stopping the machine to replace the seals, and avoiding the economic losses caused by the shutdown.

[0088] It should be noted that, in the embodiments of the present invention, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0089] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0090] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as a limitation of the present invention. After reading the above content, it will be apparent to those skilled in the art that various modifications and substitutions of the present invention will occur. Therefore, the protection scope of the present invention should be limited by the appended claims.

Claims

1. A hydraulic oil replenishing system for a diaphragm compressor, characterized in that, it comprises: An oil inlet valve (102) which is arranged on the housing (101) of the diaphragm compressor (1), communicates with the oil chamber (1011) of the housing (101), and is used for adding hydraulic oil into the oil chamber (1011); An oil drain valve (103) which is arranged on the housing (101) of the diaphragm compressor (1), communicates with the oil chamber (1011) of the housing (101), and communicates with the cylinder block (11) of the diaphragm compressor (1), and is used for replenishing the hydraulic oil in the oil chamber (1011) into the cylinder block (11) of the diaphragm compressor (1); An oil replenishing plunger pump (14) which is installed on the housing (101) of the diaphragm compressor (1) and is used for replenishing hydraulic oil into the diaphragm compressor (1); the oil replenishing plunger pump (14) comprises a plunger (104), a plunger sleeve (105) and a spring (106), the plunger (104) is arranged in the oil chamber (1011) of the housing (101), a plunger sleeve (105) is arranged on the plunger (104), the upper end of the plunger (104) extends out of the oil chamber (1011) and can contact with the bearing (10) on the eccentric sleeve of the crankshaft (15) of the diaphragm compressor (1), the eccentric sleeve drives the plunger (104) to move downward through the bearing (10), a spring (106) is arranged at the lower end of the plunger (104), and a stepped portion (1041) is arranged on the plunger (104) for cooperating with an adjusting screw cap (107) to realize the limit of the plunger (104); An adjusting screw cap (107) which is arranged on the housing (101) of the diaphragm compressor (1) and is used for adjusting the movement stroke of the plunger (104); the adjusting screw cap (107) has a cover plate (1071) and a limiting portion (1072) located below the cover plate (1071), the cover plate (1071) and the limiting portion (1072) have through holes (1073), the upper end of the plunger (104) passes through the through hole (1073) and faces the end face of the bearing (10) on the eccentric sleeve, and the limiting portion (1072) clamps the stepped portion (1041) of the plunger (104) to realize the limit of the plunger (104); A data acquisition module for real-time acquisition of the oil drain and exhaust state data of the diaphragm compressor (1); A control module which is connected to the data acquisition module and the oil replenishing plunger pump (14) and is used for adjusting the oil replenishing amount of the oil replenishing plunger pump (14) in real time according to the oil drain and exhaust states of the diaphragm compressor (1).

2. The hydraulic oil replenishing system for a diaphragm compressor according to claim 1, characterized in that, The outer wall of the limiting portion (1072) is provided with an external thread, the inner wall of the housing (101) is provided with an internal thread, and the adjusting screw cap (107) and the housing (101) are fixedly connected by threads.

3. The hydraulic oil replenishing system for a diaphragm compressor according to claim 1, characterized in that, The hydraulic oil replenishing system further includes an actuator, which automatically rotates the adjusting screw cap (107) according to the action instruction of the control module to adjust the movement stroke of the plunger (104), thereby adjusting the replenishing oil volume of the replenishing oil plunger pump (14).

4. The hydraulic oil replenishing system of the diaphragm compressor according to claim 1, wherein, the diameter of the through hole (1073) is 0.5 mm to 1.5 mm larger than the diameter of the plunger (104).

5. The hydraulic oil replenishing system of the diaphragm compressor according to claim 1, wherein, the hydraulic oil replenishing system further includes: a monitoring terminal, which is connected to the control module and is used for displaying the oil discharge and exhaust states of the diaphragm compressor (1) in real time.

6. The hydraulic oil replenishing system of the diaphragm compressor according to claim 1, wherein, the data acquisition module includes: an oil discharge pressure acquisition module (17), which is arranged on the cylinder block (11) of the diaphragm compressor (1) and is used for acquiring the oil discharge pressure signal of the diaphragm compressor (1) in real time and transmitting it to the control module; an exhaust pressure acquisition module (18), which is arranged on the exhaust pipeline of the diaphragm compressor (1) and is used for acquiring the exhaust pressure signal of the diaphragm compressor (1) in real time and transmitting it to the control module; an exhaust flow acquisition module (19), which is arranged on the exhaust pipeline of the diaphragm compressor (1) and is used for acquiring the exhaust flow signal of the diaphragm compressor (1) in real time and transmitting it to the control module.

7. The hydraulic oil replenishing system of the diaphragm compressor according to claim 1, wherein, the adjusting screw cap (107) further includes: a plurality of rib plates (1074), the rib plates (1074) are connected to the cover plate (1071), and the rib plates (1074) are located outside the housing (101), and the plurality of rib (1074) plates are evenly distributed at equal intervals in the circumferential direction.

8. A method for replenishing hydraulic oil of a diaphragm compressor by using the hydraulic oil replenishing system of the diaphragm compressor according to any one of claims 1-7, wherein, it includes the following steps: The control module acquires the oil discharge pressure signal P of the diaphragm compressor (1) acquired in real time by the oil discharge pressure acquisition module (17) and the exhaust pressure signal P of the diaphragm compressor (1) acquired in real time by the exhaust pressure acquisition module (18). 0 and an exhaust flow signal G of the diaphragm compressor (1) collected in real time by an exhaust flow collection module (19). 0 ; The control module determines that the oil drainage pressure signal P is less than the alarm threshold P for low oil drainage pressure preset 2 , and the exhaust pressure signal P 0 is less than the alarm threshold P for low exhaust pressure preset 3 , and the exhaust gas flow signal G 0 is greater than the alarm threshold G for high exhaust gas flow preset 1 , then the control module sends an action instruction to the actuator, and the actuator automatically rotates the adjusting screw cap (107) to move it towards the direction of the eccentric sleeve until the oil drainage pressure signal P is greater than the alarm threshold P for low oil drainage pressure preset 2 .

9. The method for replenishing hydraulic oil of the diaphragm compressor according to claim 8, wherein, The control module determines that the oil discharge pressure signal P is greater than the preset high alarm threshold P for oil discharge pressure 1 , and the operator needs to check the operating status of the pressure regulating valve and its pipeline of the diaphragm compressor (1) and adjust its unloading pressure to the design value.

10. The method for replenishing hydraulic oil of the diaphragm compressor according to claim 8, wherein, the control module controls the actuator to adjust the adjusting screw cap (107) to move a unit length towards the direction of the eccentric sleeve each time, and the unit length is a pitch, or the quotient of a single pitch divided by the total number of rib plates (1074).

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