Diaphragm adjusting device of diaphragm compressor under low negative pressure air intake

Abstract

The utility model discloses a diaphragm adjusting device of a diaphragm compressor under low-negative-pressure air inlet. The diaphragm adjusting device comprises a piston assembly, a crosshead assembly, an air distribution disc and an oil distribution disc. The three metal diaphragms are arranged between the gas side diaphragm cavity and the oil side diaphragm cavity in an overlapped mode, and the middle diaphragm is provided with a guide groove to be communicated with the leakage detection opening; the electromagnet is arranged on the surface layer, close to the diaphragm side, of the oil distribution disc; the piezoelectric ceramics are respectively fixed in the machine body assembly and are close to an upper dead center and a lower dead center of the crosshead assembly; the springs are fixed on the two sides of the machine body assembly, are insulated from the crosshead assembly and are used for triggering the piezoelectric ceramics; the electromagnets are electrically connected with the piezoelectric ceramics respectively; the switch is attracted and controlled by the electromagnet to switch on and off of a circuit; the slide rheostat is connected in series with the electromagnet to adjust the adsorption force; the spring impacts the piezoelectric ceramic when the crosshead assembly moves to the upper stop point and the lower stop point, current is excited to enable the electromagnet to attract the switch, and then power-on and power-off of the electromagnet are controlled.

Description

TECHNICAL FIELD

[0001] The utility model relates to a compressor technical field, concretely relates to a low negative pressure intake diaphragm compressor diaphragm adjusting device. BACKGROUND

[0002] The diaphragm compressor is a kind of volumetric compressor, and different from traditional reciprocating piston compressor directly compressing gas through piston, diaphragm compressor drives membrane reciprocating motion by pushing hydraulic oil through piston to compress gas, because membrane divides compression cavity into gas cavity and oil cavity, gas does not directly contact with oil, so it has the advantages of high purity, good sealing performance and the like, in addition, because it has the advantages of small vibration, low noise, small clearance volume, stable operation and the like, so it is widely applied to the work of hydrogenation station.

[0003] The structure of existing diaphragm compressor is as shown in Figure 1 First, gas side membrane head and oil side membrane head are connected into membrane head assembly 01 through stud; metal diaphragm is placed between gas side membrane head and oil side membrane head and is pressed tightly through stud pretightening force; middle body and crankcase are connected into machine body assembly 04 through stud, then membrane head assembly 01 and machine body assembly 04 are connected through thread; crosshead assembly 03, piston assembly 02 and crank connecting rod assembly 05 are all connected through thread; crank connecting rod assembly 05 is placed in crankcase; crosshead assembly 03 is placed in middle body slide; plunger pump assembly 06 is attached to non-flywheel side of crankshaft, extracts hydraulic oil from crankcase and supplements oil side membrane cavity. Motor drives crank connecting rod mechanism, further drives piston to reciprocate, when piston moves upward to top dead center, piston pushes hydraulic oil, further drives diaphragm to deform upward, diaphragm finally deforms and adheres to gas cavity wall surface, realizes compression and exhaust of gas in gas cavity. When piston moves downward, oil pressure will be reduced until lower than intake pressure, intake pressure in gas cavity will drive diaphragm to deform into oil cavity until piston runs to bottom dead center position.

[0004] If slightly lower than atmospheric pressure intake, because pressure is too low, under the combined action of gas side gas pressure, oil side oil pressure and diaphragm's own resilience, diaphragm cannot adhere to specified position on oil side, equivalent to reducing volume in suction process, reducing volumetric efficiency.

[0005] Generally, three metal diaphragms are selected, and a groove is formed in the middle diaphragm to connect the leakage detection hole and communicate with the atmosphere. If the gas side or oil side diaphragm is broken, the high-pressure gas or hydraulic oil will be discharged through the groove to achieve the effect of safe production and early warning. During the negative pressure intake process, the middle diaphragm is connected to the atmosphere, the gas side diaphragm is respectively connected to the negative pressure and the atmospheric pressure on both sides, the gas side diaphragm cannot return to the middle balance position, the pressure of the oil cavity is reduced to the atmospheric pressure, and the oil side diaphragm will normally return to the middle balance position, so that the air pocket is formed between the three diaphragms, which indirectly leads to the decrease of the volume of the gas cavity, and the volumetric efficiency is obviously decreased.

[0006] Compared with the normal pressure intake, the diaphragm compression efficiency will be suddenly reduced under the low negative pressure intake due to the diaphragm separation and the difficulty in deforming to the oil side. The diaphragm compression machine does not have a matching device to improve the volumetric efficiency of the diaphragm compression machine under the low negative pressure intake condition, and the negative influence caused by the diaphragm separation cannot be eliminated by adjusting the oil supplementing amount, and the oil cavity pressure is reduced to the normal pressure, and the hydraulic oil will generate bubbles, and local cavitation is caused. Practical new type content

[0007] The utility model discloses a kind of diaphragm compression machine diaphragm adjusting devices under low negative pressure intake, to solve the technical problems existing in background art.

[0008] To achieve the above object, the utility model adopts the following technical scheme:

[0009] A kind of diaphragm compression machine diaphragm adjusting devices under low negative pressure intake, it is characterized by comprising:

[0010] Piston assembly, crosshead assembly, gas distribution disc, oil distribution disc;

[0011] Three metal diaphragms arranged in superposition, between gas side diaphragm cavity and oil side diaphragm cavity, wherein middle diaphragm is equipped with the guide groove that communicates with leakage detection port;

[0012] Electromagnet, setting in the surface layer of oil distribution disc close to diaphragm side;

[0013] Piezoelectric ceramic, respectively fixed in the upper dead point and lower dead point position of crosshead assembly and adjacent inside machine body assembly;

[0014] Spring, fixed in both sides of machine body assembly and insulated with crosshead assembly, for triggering piezoelectric ceramic;

[0015] Electromagnet control unit, electrically connected with piezoelectric ceramic;

[0016] Switch, is adsorbed by electromagnet control unit to switch circuit on-off;

[0017] Slide rheostat, in series with electromagnet to adjust its adsorption force;

[0018] The spring hits the piezoelectric ceramic when the crosshead assembly moves to the upper and lower dead points, generates an electric current to make the electromagnetic iron control unit adsorb the switch, and then controls the on-off of the electromagnetic iron to exert an electromagnetic force directed to the oil side to adjust the adhesion state of the diaphragm.

[0019] In some embodiments, the on-off of the electromagnetic iron is synchronized with the movement of the piston, and the electromagnetic iron is powered on in the suction stage to assist the deformation of the diaphragm to the oil side and increase the volume of the air cavity.

[0020] In some embodiments, the sliding rheostat adjusts the adsorption force of the electromagnetic iron dynamically to adapt to different low negative pressure intake conditions.

[0021] In some embodiments, the spring is a flexible spring that is used to prolong the time of hitting the piezoelectric ceramic and ensure the continuous power-on of the electromagnetic iron control unit.

[0022] In some embodiments, the guide groove of the intermediate diaphragm has an area much smaller than the working area of the diaphragm to reduce the influence of the air pressure difference on the separation of the diaphragm.

[0023] In some embodiments, the adsorption force of the electromagnetic iron satisfies: the adsorption force is equal to the difference between the normal pressure value and the intake pressure multiplied by the working area of the diaphragm, and the resultant force acting on the three diaphragms is evenly distributed.

[0024] In some embodiments, the switch is made of ferromagnetic material and switches to different contacts when adsorbed by the electromagnetic iron control unit, corresponding to the power-on and power-off states of the electromagnetic iron, respectively.

[0025] In some embodiments, the device is suitable for negative pressure intake conditions, and the electromagnetic force eliminates the air pocket between the diaphragms to improve the volumetric efficiency to the level of normal pressure intake.

[0026] The low negative pressure intake diaphragm adjusting device for diaphragm compressors disclosed in the present application may have the following beneficial effects, but not limited to:

[0027] (1) When the existing diaphragm compressor stops negative pressure intake, the diaphragm cannot return to the equilibrium position, which reduces the suction volume. The electromagnetic force adsorption effect of the present application assists the diaphragm to rebound, increases the volume of the air cavity, and improves the suction volume, thereby improving the volumetric efficiency of the compressor. The present application avoids the problem of negative pressure bubble separation caused by directly adjusting the oil pressure of the oil chamber.

[0028] (2) When the diaphragm compressor is in low pressure intake, the diaphragm cannot deform to the oil side due to the small pressure, and the electromagnetic force assisted deformation can greatly improve the suction volume, which is beneficial to the improvement of the volumetric efficiency.

[0029] (3)The acting time of the electromagnet is directly controlled by the cross head, so that the electromagnet can be synchronized with the piston under adverse working conditions, is suitable for various working conditions, and the adsorption force size can be adjusted to cope with different low negative pressure scenes. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 : the existing diaphragm compressor structure schematic diagram;

[0031] Figure 2 : the diaphragm adjusting device structure diagram;

[0032] Figure 3 : the electromagnet adsorption circuit diagram;

[0033] Figure 4 : the intermediate diaphragm schematic diagram. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application, and are not used to limit the present application.

[0035] On the contrary, the present application covers any alternative, modification, equivalent method and scheme defined by the claims on the essence and scope of the present application. Further, in order to make the public better understand the present application, some specific details are described in detail in the following detailed description of the present application. The present application can also be completely understood without the description of these details by those skilled in the art.

[0036] As Figures 1-4 shown, the utility model provides a kind of device for adjusting diaphragm position of electromagnet, this structure can extrude diaphragm middle gas pocket and adjust diaphragm position, improve suction volume, and then improve volumetric efficiency.

[0037] As Figure 2 , to realize above-mentioned purpose, the utility model provides following technical scheme: a kind of diaphragm compressor diaphragm adjusting device, including piston assembly 02, cross head assembly 03, gas distribution disc 07, diaphragm (08A, 08B, 08C), electromagnet 09, oil distribution disc 10, piezoelectric ceramic 11, piezoelectric ceramic 12, electromagnet 13, electromagnet 14, spring 15, spring 16, switch S, sliding rheostat R1.

[0038] The diaphragm (08A, 08B, 08C) is a metal diaphragm, three diaphragms are overlapped and installed, can be deformed to two sides, and divides the diaphragm cavity into the air side diaphragm cavity and the oil side diaphragm cavity, the diaphragm 08B is provided with a guide groove connected with the leakage detection port to connect the atmosphere; the switch S is a ferromagnetic material; the electromagnet 09 is arranged on the whole surface of the oil distribution disc 10 close to the diaphragm; the piezoelectric ceramic 11 is fixed in the middle body 04A and close to the top dead center position of the cross head 03, the spring 15 is fixed on the left side of the middle body, when the cross head moves to the top dead center, the spring 15 hits the piezoelectric ceramic 11, the piezoelectric ceramic 11 generates current to make the electromagnet 13 generate electromagnetic force to adsorb the switch S; the piezoelectric ceramic 12 is fixed in the middle body 04A and close to the bottom dead center position of the cross head 03, the spring 16 is fixed on the right side of the middle body, when the cross head moves to the bottom dead center, the spring 16 hits the piezoelectric ceramic 12, the piezoelectric ceramic 12 generates current to make the electromagnet 14 generate electromagnetic force to adsorb the switch S; the slide rheostat is connected with the electromagnet 09 in series, for controlling the size of the electromagnetic force.

[0039] As Figure 3 When the piston moves to the top dead center, the piezoelectric ceramic 11 generates current, the electromagnet 13 generates electromagnetic force to adsorb the switch S to connect the contact I, at this time, the electromagnet 09 is electrified, an oil side force is applied to the diaphragm, and the size of the force can be controlled through the slide rheostat R1, ignoring the rebound force of the diaphragm, the size of the force = (the normal pressure, that is, the minimum value of the oil pressure - the intake pressure) x the diaphragm area. The force is continuously applied until the piston moves to the bottom dead center, the piezoelectric ceramic 12 generates current, the electromagnet 14 generates electromagnetic force to adsorb the switch S to connect the contact II, disconnects the contact I, the electromagnet 09 is de-energized, and the electromagnetic force disappears.

[0040] The electromagnet 09 is turned on and off with the piston, and assists the diaphragm to move to the oil side in the suction process, improves the volume of the air cavity, increases the suction amount, and further improves the volumetric efficiency.

[0041] The three diaphragms are closely attached together due to the oil pressure in the compression process, and are still attached together due to the oil pressure which is lowered to be flat with the intake pressure in the normal pressure intake process. However, in the negative pressure intake process, the three diaphragms may be separated due to the diaphragm 08B connected with the atmosphere, and the utility model can avoid this problem.

[0042] As Figure 4As shown, the middle diaphragm slot area is very small, recorded as A1, much smaller than the diaphragm working area A2 (except for a small range of clamping, all belong to the working area), A2 will change due to deformation, but can be considered as the same as the three diaphragms without separation, and still represented by A2. In the negative pressure process, when the diaphragm separates from the air distribution plate 07, the air inlet starts, and the air inlet pressure is recorded as P1. At this time, the oil pressure is still high, the diaphragm will not separate, and when the oil pressure is reduced to atmospheric pressure P, 08A will separate from 08B due to the difference in pressure difference on both sides. In the utility model, the resilience of the diaphragm itself is small, so it is ignored, the total electromagnetic force of the three diaphragms is recorded as F1, and F1=(P-P1)×A2. Since the diaphragm thickness is very small, the force applied to each diaphragm when not separated is approximately the same, recorded as F1 / 3. Since the middle diaphragm slot is very small, 08A is affected by the air pressure difference F2=(P-P1)×A1<<F1 / 3, so the three diaphragms will not separate under the action of electromagnetic force. At this time, the diaphragm returns to the equilibrium position when the air suction is finished, the air suction efficiency has been improved, and the electromagnetic force can be further increased, the diaphragm will continue to deform to the oil side, and the air suction amount will be further improved. Therefore, the diaphragm separation under negative pressure air inlet will be solved, the air cavity volume is improved, and the volumetric efficiency is improved.

[0043] The above only describes the preferred embodiments of the utility model, and does not limit the utility model, any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A diaphragm adjustment device for a low negative suction pressure diaphragm compressor, characterized by, It comprises: a piston assembly, a crosshead assembly, a gas distribution plate, and an oil distribution plate; three metal diaphragms, which are arranged in a superimposed manner between the gas-side diaphragm cavity and the oil-side diaphragm cavity, wherein the middle diaphragm is provided with a guide groove to communicate with a leakage detection port; an electromagnet arranged on the surface of the oil distribution plate close to the diaphragm; piezoelectric ceramics fixed respectively on the inside of the machine body assembly and close to the top dead center and bottom dead center positions of the crosshead assembly; springs fixed on both sides of the machine body assembly and insulated from the crosshead assembly, for triggering the piezoelectric ceramics; electromagnets electrically connected respectively to the piezoelectric ceramics; a switch controlled by the electromagnet to switch the circuit on and off; a sliding rheostat connected in series with the electromagnet to adjust the attraction force thereof; wherein the springs hit the piezoelectric ceramics when the crosshead assembly moves to the top dead center and bottom dead center, exciting an electric current to make the electromagnet attract the switch, thereby controlling the on-off of the electromagnet to exert an electromagnetic force directed to the oil side to adjust the adhesion state of the diaphragm.

2. The diaphragm compressor diaphragm adjusting device according to claim 1, wherein: the on-off of the electromagnet is synchronized with the movement of the piston, and the electromagnet is powered on in the suction stage to assist the deformation of the diaphragm to the oil side, thereby increasing the volume of the gas cavity.

3. The diaphragm compressor diaphragm adjusting device according to claim 1, wherein: the sliding rheostat adjusts the current intensity of the electromagnet to realize dynamic adjustment of the attraction force, so as to adapt to different low negative pressure intake working conditions.

4. The diaphragm compressor diaphragm adjusting device according to claim 1, wherein: the spring is a flexible spring, which is used to prolong the time of hitting the piezoelectric ceramics and ensure the continuous power-on of the electromagnet.

5. The diaphragm compressor diaphragm adjusting device according to claim 1, wherein: the area of the guide groove of the middle diaphragm is smaller than the working area of the diaphragm, so as to reduce the influence of the air pressure difference on the separation of the diaphragm.

6. The diaphragm compressor diaphragm adjusting device according to claim 1, wherein: the attraction force F1 of the electromagnet satisfies F1 = (atmospheric pressure value - intake pressure) × diaphragm working area, and the resultant force acting on the three diaphragms is evenly distributed.

7. The diaphragm compressor diaphragm adjusting device according to claim 1, wherein: the switch is made of ferromagnetic material, and switches to contact point I or contact point II when attracted by the electromagnet, corresponding to the power-on and power-off states of the electromagnet, respectively.

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