A diaphragm compressor for negative pressure intake and method of use

Abstract

The present application relates to the technical field of diaphragm compressor, and particularly relates to a diaphragm compressor for negative pressure air intake and a use method. The diaphragm compressor comprises a cylinder structure, the cylinder structure comprises a gas-side membrane head, a diaphragm assembly, an oil distribution disc, an oil-side membrane head, an oil cylinder sleeve and a piston, the oil-side membrane head and the gas-side membrane head are both provided with a bidirectional sealing ring in the axial direction, and the oil-side membrane head is provided with a radial detection through hole; the gas suction port of the gas-side membrane head is connected with a gas suction pipeline, the gas exhaust port is connected with a gas exhaust pipeline, the gas suction pipeline is further connected with a gas conveying pipeline, the gas conveying pipeline is connected with the detection through hole, and the gas exhaust pipeline is further connected with a gas exhaust bypass pipeline. The diaphragm gap is connected with the gas suction pipeline, the gas exhaust pipeline, the gas conveying pipeline and the gas exhaust bypass pipeline in the mode of the present application, vacuum is extracted between the diaphragms, the pressure of the diaphragm gap is reduced below the gas suction pressure, the generation of the bulge is effectively avoided, the effective volume of the membrane cavity is increased, and the problem of the diaphragm separation bulge of the existing diaphragm compressor for negative pressure air intake is solved.

Description

Technical Field

[0001] This invention relates to the field of diaphragm compressor technology, and specifically to a diaphragm compressor for negative pressure intake and its usage method. Background Technology

[0002] Diaphragm compressors, as a special type of gas compression equipment, have broad application prospects in fields with extremely high gas quality requirements, such as electronics, chemicals, and pharmaceuticals, because they can achieve a leak-free and pollution-free gas compression process. Diaphragm compressors separate the compressed gas from the drive components through a diaphragm, avoiding direct contact between the gas and lubricating oil, thus enabling operation under conditions requiring high gas cleanliness. Traditional compressors often cannot meet the safe compression requirements of certain high-purity, corrosive, or highly toxic gases, while diaphragm compressors, due to their unique design and advantages, are the ideal equipment to solve this problem.

[0003] The cylinder structure of commonly used diaphragm compressors is as follows: Figures 1-4 As shown, the assembly includes a gas-side diaphragm head 01, a diaphragm assembly 02, a distribution plate 03, an oil-side diaphragm head 04, a cylinder liner 05, a piston 06, and an O-ring 07. The gas-side diaphragm head 01 and the oil-side diaphragm head 04 are connected by long bolts, and the diaphragm assembly 02 and the distribution plate 03 are clamped between the oil-side diaphragm head 04 and the gas-side diaphragm head 01. The cylinder liner 05 is connected to the oil-side diaphragm head 04 by bolts. The left side of the diaphragm assembly 02 contains hydraulic oil, and the right side contains compressed gas. During operation, the piston rod 06 reciprocates, pushing the hydraulic oil. The hydraulic oil acts on the diaphragm assembly 02, causing deformation and thus compressing the gas. The diaphragm assembly 02 includes three layers of diaphragms: the two outer diaphragms 02-1 are complete circular thin plates, and the middle diaphragm 02-2 has four radial notches machined on the circular thin plate.

[0004] A radial hole A is opened on the oil-side diaphragm head 04, which is used for leak detection. However, on the one hand, during negative pressure intake, air can enter the cylinder through the radial hole A and enter the radial groove of the intermediate diaphragm 02-2. On the other hand, since the O-rings 07 around the leak detection holes in the current diaphragm compressor are all one-way seals, that is, only considering preventing compressed gas from leaking outward, it is impossible to prevent air from leaking from the diaphragm head gap B between the gas-side diaphragm head 01 and the oil-side diaphragm head 04 into the radial groove of the intermediate diaphragm 02-2. Air can also enter through the diaphragm head gap B. Since the air pressure entering the radial groove of the intermediate diaphragm 02-2 is close to atmospheric pressure, which is higher than the intake pressure of the diaphragm compressor, the two diaphragms 02-1 on both sides separate under the combined pressure, and a bulge is formed in the center, which occupies the intake volume and leads to a reduction in intake volume.

[0005] From the above, the existing diaphragm compressor mostly focuses on the design of positive pressure intake, and there are few designs for negative pressure intake. When the ordinary diaphragm compressor for positive pressure intake is used in negative pressure working condition, the diaphragm separates and bulges, the volumetric efficiency sharply decreases, a large amount of energy is wasted, and the economic demand cannot be met. SUMMARY

[0006] The present application aims at overcoming the deficiencies of the prior art, and provides a diaphragm compressor for negative pressure intake and a use method, which solves the technical problem of diaphragm separation and bulging when the existing diaphragm compressor is used for negative pressure intake. The diaphragm gap is connected with the suction pipe, the exhaust pipe, the gas conveying pipe and the exhaust bypass pipe, the diaphragm gap is first vacuumized, the pressure of the diaphragm gap is reduced below the suction pressure, the generation of bulging is effectively avoided, the effective volume of the diaphragm chamber is increased, and on the other hand, the design structure and method in the present application do not affect the leak detection function of the compressor, and the safety of the compressor operation is ensured.

[0007] To achieve the above object, the present application adopts the following technical scheme:

[0008] The first object of the present application is to provide a diaphragm compressor for negative pressure intake, which comprises a cylinder structure, the cylinder structure comprises a gas side membrane head, a diaphragm assembly, an oil distribution disc, an oil side membrane head, an oil cylinder sleeve and a piston, the oil side membrane head and the gas side membrane head are provided with bidirectional sealing rings in the axial direction, and the oil side membrane head is provided with a radial detection through hole.

[0009] The suction port of the gas side membrane head is connected with a suction pipe, the exhaust port is connected with an exhaust pipe, the suction pipe is further connected with a gas conveying pipe, the gas conveying pipe is connected with the detection through hole, and the exhaust pipe is further connected with an exhaust bypass pipe.

[0010] Further, a first control valve and a vacuum pressure detector are arranged on the gas conveying pipe.

[0011] Further, a second control valve is arranged on the suction pipe, and the second control valve is located in front of the connection between the gas conveying pipe and the suction pipe in the intake direction.

[0012] Further, a third control valve is arranged on the exhaust pipe, the third control valve is located behind the connection between the exhaust pipe and the exhaust bypass pipe in the exhaust direction, and a fourth control is arranged on the exhaust bypass pipe.

[0013] Further, a one-way valve is arranged on the radial detection through hole.

[0014] Further, the diaphragm gap is formed between the bidirectional sealing ring, the one-way valve and the control valve, and the diaphragm gap is a closed space.

[0015] The second object of the present application is to provide a method for using the diaphragm compressor for negative pressure intake as described above, comprising the following steps:

[0016] S1, during the negative pressure working condition, the diaphragm gap is vacuumized, the diaphragm compressor is started, the second control valve and the third control valve are closed, the first control valve and the fourth control valve are opened, the diaphragm compressor works to extract the gas in the diaphragm gap and discharge it from the exhaust bypass pipeline.

[0017] S2, when the vacuum pressure detector detects that the gas pressure in the gap is lower than the compressor suction pressure, the first control valve and the third control valve are closed, the second control valve and the fourth control valve are opened, the compressor works, the suction pipeline is connected to the gas, and the exhaust bypass pipeline is used to discharge the air in the diaphragm chamber.

[0018] S3, after the purity of the compressed gas in the exhaust bypass pipeline reaches the requirement, the fourth control valve and the first control valve are closed, the third control valve and the second control valve are opened, the compressor sucks the gas from the suction pipeline and discharges it from the exhaust pipeline, and the compressor starts to work normally.

[0019] Further, the exhaust bypass pipeline is provided with a compressed gas purity detector for detecting the purity of the compressed gas.

[0020] Further, when the diaphragm of the diaphragm compressor is broken, the pressure before the one-way valve is higher than the atmospheric pressure, so that the one-way valve is opened to detect the leakage.

[0021] The present application has the following advantages compared with the prior art:

[0022] The diaphragm compressor for negative pressure intake provided by the present application is provided with a bidirectional sealing ring on the oil side membrane head and the gas side membrane head in the axial direction, the gas suction port of the gas side membrane head is connected with a gas suction pipeline, the gas exhaust port is connected with a gas exhaust pipeline, the gas suction pipeline is further connected with a gas conveying pipeline, the gas conveying pipeline is connected with a detection through hole, and the gas exhaust pipeline is further connected with an exhaust bypass pipeline. By connecting the diaphragm gap with the gas suction pressure pipeline, the diaphragm gap is vacuumized, the gas pressure in the diaphragm gap is ensured to be lower than the suction pressure, the three diaphragms are ensured to be in a sticking state under the negative pressure working condition, air pocket is avoided, the diaphragms are ensured not to be separated during the working process, the volumetric efficiency of the diaphragm compressor is ensured, and the use range of the diaphragm compressor is expanded. In addition, the exhaust bypass pipeline for the diaphragm gap gas is arranged on the gas exhaust pipeline, the air in the diaphragm chamber is ensured to be exhausted before formal work, and the purity of the compressed gas is ensured.

[0023] The one-way valve arranged on the detection through hole can ensure the leakage detection function of the compressor without air leakage, does not affect the leakage detection function of the compressor, and ensures the safety of the compressor operation. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the existing diaphragm compressor.

[0025] Figure 2 It is Figure 1 It is an enlarged structural schematic diagram at C.

[0026] Figure 3 It is a structural schematic diagram of the two side diaphragms of the existing diaphragm compressor.

[0027] Figure 4 It is a structural schematic diagram of the middle diaphragm of the existing diaphragm compressor.

[0028] Figure 5 It is a structural schematic diagram of the diaphragm compressor for negative pressure intake provided by the present application.

[0029] Figure 6 It is Figure 5 It is a partial enlarged schematic diagram at B position.

[0030] Illustration:

[0031] 1, gas side diaphragm head; 2, diaphragm assembly; 3, oil distribution plate; 4, oil side diaphragm head; 4A, detection through hole; 5, piston sleeve; 6, piston; 7, bidirectional sealing ring; 8, air suction pipeline; 9, exhaust pipeline; 10, gas conveying pipeline; 11, exhaust bypass pipeline; 12, air pressure detector; 13, one-way valve.

[0032] V01, first control valve; V02, second control valve; V03, third control valve; V04, fourth control valve. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work shall fall within the scope of protection of the present application.

[0034] It should be noted that the professional terms used in the present application are only for the purpose of describing the specific embodiments, and are not intended to limit the protection scope of the present application. In the present application, certain terms are used to refer to specific components. Those skilled in the art should understand that the same component can be referred to by different terms. The present application does not distinguish components by the difference in terms, but by the difference in function. As mentioned throughout the specification and claims, "including" is an open term, so it should be understood as "including but not limited to".

[0035] Diaphragm compressor as a kind of gas compression industrial production device, by piston driven hydraulic oil makes its pressure change, diaphragm under the action of oil and gas pressure difference reciprocating deformation, so that the volume of gas changes, thereby completing the compression of gas. The existing compressor usually uses three-layer diaphragm, two sides diaphragm is complete circular diaphragm, middle diaphragm is in the circular diaphragm opening has guide groove, after the rupture of two side diaphragm, hydraulic oil or gas can flow from the guide groove to the leak hole. Since the middle diaphragm has gap and is communicated with atmosphere, therefore, the gap maintains constant atmospheric pressure. When negative pressure intake, due to the two sides are negative pressure state, diaphragm separates from the center of diaphragm gap under the action of atmospheric pressure in diaphragm gap, the bulge generated by it occupies the gas suction volume, thereby resulting in a large loss of gas suction amount, so that the efficiency of compressor far from the design value.

[0036] Based on this, in view of the problem that the diaphragm separates and produces bulge under negative pressure condition in the existing diaphragm compressor, the application designs a diaphragm compressor for negative pressure intake, by connecting the diaphragm gap with the gas suction pressure pipeline, realizes the vacuum treatment of the gas in diaphragm gap, ensures that the gas pressure in diaphragm gap is lower than the gas suction pressure, ensures that the three diaphragms are always in the state of adhesion under negative pressure condition, avoids the generation of air pocket, ensures that the diaphragm will not separate during the working process, and further ensures the volumetric efficiency of the diaphragm compressor, expands the use range of the diaphragm compressor. Specifically as follows:

[0037] As shown in Figure 5 And Figure 6 The application provides a diaphragm compressor for negative pressure intake, which comprises a cylinder structure, the cylinder structure comprises a gas side diaphragm head 1, a diaphragm assembly 2, an oil distribution disc 3, an oil side diaphragm head 4, an oil cylinder sleeve 5 and a piston 6, the oil side diaphragm head 4 and the gas side diaphragm head 1 are provided with bidirectional sealing rings 7 in the axial direction, and the oil side diaphragm head 4 is provided with a radial detection hole 4A; the gas suction pipe 8 is connected to the gas suction port of the gas side diaphragm head 1, the exhaust pipe 9 is connected to the exhaust port, the gas suction pipe 8 is further connected to the gas conveying pipe 10, the gas conveying pipe 10 is connected to the detection hole 4A, and the exhaust bypass pipe 11 is further connected to the exhaust pipe 9.

[0038] The cylinder structure comprises a gas-side membrane head 1, a diaphragm assembly 2, an oil distribution disc 3, an oil-side membrane head 4, an oil cylinder sleeve 5 and a piston 6, the gas-side membrane head 1 and the oil-side membrane head 4 are detachably connected in a threaded manner, the oil distribution disc 3 is arranged in the oil-side membrane head 4, the oil distribution disc 3 is clamped between the oil-side membrane head 4 and the gas-side membrane head 1, the diaphragm assembly 2 is clamped between the oil distribution disc 3 and the gas-side membrane head 1, and the oil-side membrane head 4 and the gas-side membrane head 1, so as to form a sealed cavity and avoid gas leakage, one end of the oil cylinder sleeve 5 is arranged in the oil-side membrane head 4 and connected through a bolt, and the piston 6 is slidingly arranged in the oil cylinder sleeve 5, in the working process, the piston rod 6 reciprocates to push hydraulic oil, the hydraulic oil acts on the diaphragm assembly 2 to deform, and the purpose of compressing gas is achieved.

[0039] The radial detection through hole 4A is connected with the gas conveying pipeline 10 and is provided with a gas conveying bypass pipeline, the gas conveying bypass pipeline is provided with a one-way valve 13, the one-way valve 13 is communicated with the radial detection through hole 4A, the safety of the compressor in operation is ensured under the condition that the air is not leaked, and the leakage detection function of the compressor is not affected.

[0040] In one specific embodiment, the gas conveying pipeline 10 is provided with a first control valve V01 and a vacuum pressure detector 12. In the present application, the vacuum pressure detector 12 is a vacuum pressure detector, the pressure in the gas conveying pipeline 10 is detected through the vacuum detector, that is, after the gas pressure in the gap is lower than the suction pressure of the compressor, the first control valve V01, the second control valve V02, the third control valve V03 and the fourth control valve V04 are controlled to make the suction pipeline 8 pass into the gas.

[0041] In one specific embodiment, the suction pipeline 8 is provided with a second control valve V02, the second control valve V02 is located in front of the connection position of the gas conveying pipeline 10 and the suction pipeline 8 along the air inlet direction. In the present application, the second control valve V02 is controlled to control the gas passing into the suction pipeline 8.

[0042] In one specific embodiment, the exhaust pipeline 9 is provided with a third control valve V03, the third control valve V03 is located behind the connection position of the exhaust pipeline 9 and the exhaust bypass pipeline 11 along the air outlet direction, and the fourth control valve V04 is arranged on the exhaust bypass pipeline 11. In the present application, the third control valve V03 is controlled to control the exhaust of the exhaust pipeline 9.

[0043] In one specific embodiment, the diaphragm gap is formed between the bidirectional sealing ring 7, the one-way valve 13 and the control valve V01, and the diaphragm gap is a closed space.

[0044] In the application, the membrane gap is connected with the suction pipeline 8, the exhaust pipeline 9, the gas conveying pipeline 10 and the exhaust bypass pipeline 11, so that the membrane gap is vacuumized, the air pressure in the membrane gap is ensured to be lower than the suction pressure, the three membranes are ensured to be in the adhering state under the negative pressure condition, the air pocket is avoided, the separation of the membranes is avoided in the working process, the volumetric efficiency of the diaphragm compressor is ensured, and the use range of the diaphragm compressor is expanded. In addition, the exhaust bypass pipeline 11 for the membrane gap gas is arranged on the exhaust pipeline 9, so that the air in the membrane cavity is exhausted before formal work, and the purity of the compressed gas is ensured.

[0045] The purpose of the application is to extract the air in the membrane gap by the diaphragm compressor itself, and based on this, the use method of the diaphragm compressor for negative pressure suction includes the following steps.

[0046] S1, in the working process under the negative pressure condition, the diaphragm compressor is first vacuumized before formal work, that is, the membrane gap is vacuumized, the diaphragm compressor is started, the second control valve V02 and the third control valve V03 are closed, and the first control valve V01 and the fourth control valve V04 are opened, that is, in this process, the second control valve V02 and the third control valve V03 are in the closed state, and the first control valve V01 and the fourth control valve V04 are in the opened state, at this time, the diaphragm compressor works to extract the gas in the membrane gap and discharge it from the exhaust bypass pipeline 11.

[0047] S2, when the vacuum pressure detector 12 detects that the gas pressure in the gap is lower than the suction pressure of the compressor, the first control valve V01 and the third control valve V03 are closed, the second control valve V02 and the fourth control valve V04 are opened, the compressor works, the suction pipeline 8 is connected with the gas, and the gas is discharged from the exhaust bypass pipeline 11, that is, the gap gas is exhausted, which is used for removing the air in the membrane cavity. The second control valve V02 arranged on the suction pipeline 8 is opened during the normal work of the compressor, which is used for ensuring the normal operation of the compressor.

[0048] S3, after the purity of the compressed gas on the exhaust bypass pipeline 11 reaches the requirement, the fourth control valve V04 and the first control valve V01 are closed, the third control valve V03 and the second control valve V02 are opened, the compressor sucks the gas from the suction pipeline 8 and discharges the gas from the exhaust pipeline 9, and the compressor starts to work normally.

[0049] In one specific embodiment, a compressed gas purity detector is arranged on the exhaust bypass pipeline 11, which is used for detecting the purity of the compressed gas.

[0050] In one specific embodiment, when the diaphragm compressor has a diaphragm rupture, the pressure before the one-way valve 13 is higher than the atmospheric pressure, so that the one-way valve 13 is opened for leak detection. In the present application, in the fault condition of diaphragm rupture, the pressure of the leaked gas and hydraulic oil is higher than the atmospheric pressure, so that the one-way valve 13 is opened by the leak detection hole 4A, the channels are communicated, the leaked hydraulic oil and gas are discharged, and thus the leak detection is performed, so that the leak detection function of the compressor is ensured under the condition that the air is not internally leaked, the leak detection function of the compressor is not affected, and the safety of the compressor operation is ensured.

[0051] The above description is only the preferred embodiment of the present application, and the above specific embodiments are not a limitation on the present application. Various modifications and changes can occur within the technical concept of the present application, and any modification, change or equivalent replacement made by those skilled in the art according to the above description shall fall within the scope of the present application.

Claims

1. A diaphragm compressor for negative pressure intake, comprising a cylinder structure including a gas-side diaphragm head (1), a diaphragm assembly (2), an oil distribution plate (3), an oil-side diaphragm head (4), an oil cylinder liner (5), and a piston (6), characterized in that, The oil side membrane head (4) and the gas side membrane head (1) are provided with a bidirectional sealing ring (7) on both sides of the diaphragm assembly (2) in the axial direction, and the oil side membrane head (4) is provided with a radial detection through hole (4A); The gas side membrane head (1) is connected with an air suction pipeline (8) at the air suction port and an exhaust pipeline (9) at the exhaust port, the air suction pipeline (8) is further connected with a gas conveying pipeline (10), the gas conveying pipeline (10) is connected with the detection through hole (4A), and the exhaust pipeline (9) is further connected with an exhaust bypass pipeline (11); The gas conveying pipeline (10) is provided with a first control valve (V01) and a vacuum pressure detector (12); The air suction pipeline (8) is provided with a second control valve (V02), and the second control valve (V02) is located in front of the connection position of the gas conveying pipeline (10) and the air suction pipeline (8) in the air suction direction; The exhaust pipeline (9) is provided with a third control valve (V03), and the third control valve (V03) is located behind the connection position of the exhaust pipeline (9) and the exhaust bypass pipeline (11) in the air exhaust direction, and the exhaust bypass pipeline (11) is provided with a fourth control valve (V04).

2. The diaphragm compressor for negative pressure suction according to claim 1, characterized by, The radial detection through hole (4A) is provided with a one-way valve (13).

3. The diaphragm compressor for negative pressure suction according to claim 2, characterized by, The bidirectional sealing ring (7), the one-way valve (13) and the control valve (V01) form a diaphragm gap, and the diaphragm gap is a closed space.

4. A method of using the diaphragm compressor for negative pressure intake according to claim 3, characterized in that, The method comprises the following steps: In the negative pressure working process, the diaphragm gap is vacuumized, the diaphragm compressor is started, the second control valve (V02) and the third control valve (V03) are closed, the first control valve (V01) and the fourth control valve (V04) are opened, the diaphragm compressor works to exhaust the gas in the diaphragm gap and discharge the gas from the exhaust bypass pipeline (11); When the vacuum pressure detector (12) detects that the gas pressure in the gap is lower than the compressor suction pressure, the first control valve (V01) and the third control valve (V03) are closed, the second control valve (V02) and the fourth control valve (V04) are opened, the compressor works, the air suction pipeline (8) is connected with the gas, and the gas is discharged from the exhaust bypass pipeline (11) to remove the air in the diaphragm cavity; After the purity of the compressed gas in the exhaust bypass pipeline (11) reaches the requirement, the fourth control valve (V04) and the first control valve (V01) are closed, the third control valve (V03) and the second control valve (V02) are opened, the compressor sucks the gas from the air suction pipeline (8) and discharges the gas from the exhaust pipeline (9), and the compressor starts to work normally.

5. The method of using a diaphragm compressor for negative pressure intake of claim 4, wherein, The exhaust bypass pipeline (11) is provided with a compressed gas purity detector for detecting the purity of the compressed gas.

6. The method of using a diaphragm compressor for negative pressure intake of claim 4, wherein, When the diaphragm compressor is broken, the pressure before the one-way valve (13) is higher than the atmospheric pressure, so that the one-way valve (13) is opened to detect the leakage.

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