阅读说明：本技术 一种隔膜压缩机油气压伴随控制装置及其控制系统 (Diaphragm compressor oil pressure accompanies controlling means and control system thereof ) 是由 贾晓晗 任省栋 李雪莹 彭学院 于 2020-07-14 设计创作，主要内容包括：本申请属于压缩机技术领域,特别是涉及一种隔膜压缩机油气压伴随控制装置及其控制系统。现有隔膜压缩机用膜片是易损件,要定期更换,增加了系统的故障率。本申请提供了一种油气压伴随控制装置,包括相互连接的阀盖和阀体,阀盖内设置有活塞,活塞一端与所述阀盖形成低压油腔,活塞另一端置于阀体中,阀体与活塞另一端形成溢流腔,阀体上设置有阀芯,阀体与阀芯通过连接接头连接,连接接头内设置有高压进油通道,阀芯内设置有溢油通道,溢油通道一端与堵塞组件一端连接,堵塞组件另一端与阀杆一端连接,阀杆设置于阀体内,阀杆另一端与活塞连接。活塞截面积大于阀芯溢流通道面积。有利于隔膜压缩机的安全稳定运行,减少故障率。(The application belongs to the technical field of compressors, and particularly relates to an oil pressure accompanying control device of a diaphragm compressor and a control system of the oil pressure accompanying control device. The diaphragm for the existing diaphragm compressor is a quick-wear part and needs to be replaced periodically, so that the failure rate of the system is increased. The application provides an oil gas pressure accompanies controlling means, valve gap and valve body including interconnect are provided with the piston in the valve gap, piston one end with the valve gap forms low pressure oil pocket, and the piston other end is arranged in the valve body, and the valve body forms the overflow chamber with the piston other end, is provided with the case on the valve body, and the valve body passes through attach fitting with the case to be connected, is provided with high-pressure oil feed passageway in the attach fitting, is provided with the oil spilling passageway in the case, and oil spilling passageway one end is connected with jam subassembly one end, and the jam subassembly other end is connected with valve rod one end, and the valve rod sets up in. The sectional area of the piston is larger than that of the valve core overflow channel. The diaphragm compressor is beneficial to safe and stable operation of the diaphragm compressor, and the failure rate is reduced.)

1. A diaphragm compressor oil pressure accompanies controlling means which characterized in that: the oil-saving valve comprises a valve cover and a valve body which are connected with each other, wherein a piston is arranged in the valve cover, one end of the piston and the valve cover form a low-pressure oil cavity, the other end of the piston is arranged in the valve body, an overflow cavity is formed by the other end of the piston, a valve core is arranged on the valve body, the valve body is connected with the valve core through a connecting joint, a high-pressure oil inlet channel is arranged in the connecting joint, an oil overflow channel is arranged in the valve core, one end of the oil overflow channel is connected with one end of a blocking assembly, the other end of the blocking assembly is connected with one end of a valve rod, the valve.

2. The diaphragm compressor oil pressure accompanying control device according to claim 1, characterized in that: the piston is internally provided with a guide assembly, the guide assembly is connected with a cushion block, and the cushion block is connected with an elastic component.

3. The diaphragm compressor oil pressure accompanying control device according to claim 2, characterized in that: the valve rod passes through the elastic component and the cushion block in sequence, and the other end of the valve rod is arranged in the guide assembly.

4. The diaphragm compressor oil pressure accompanying control device according to claim 3, characterized in that: an overflow port is arranged on the valve body.

5. The accompanying control device for oil pressure of a diaphragm compressor according to any one of claims 1 to 4, characterized in that: the connecting joint is connected with the oil cylinder of the diaphragm compressor.

6. The diaphragm compressor oil pressure accompanying control device according to claim 5, characterized in that: the valve body is detachably connected with the valve cover.

7. The diaphragm compressor oil pressure accompanying control device according to claim 5, characterized in that: the blocking component is a steel ball.

8. The utility model provides a diaphragm compressor oil pressure accompanies control system which characterized in that: an accompanying control device for oil pressure of a diaphragm compressor comprising the oil pressure of the diaphragm compressor according to any one of claims 1 to 7.

9. The diaphragm compressor oil pressure accompanying control device according to claim 8, characterized in that: the diaphragm compressor oil pressure accompanying control device is connected with the diaphragm compressor, the diaphragm compressor oil pressure accompanying control device is connected with the gear pump, the diaphragm compressor oil pressure accompanying control device is connected with the proportional overflow valve, and the proportional overflow valve is connected with the gear pump.

10. The diaphragm compressor oil pressure accompanying control device according to claim 9, characterized in that: the diaphragm compressor is connected with the pressure transmitter.

Technical Field

The application belongs to the technical field of compressors, and particularly relates to an oil pressure accompanying control device of a diaphragm compressor and a control system of the oil pressure accompanying control device.

Background

The diaphragm compressor is a positive displacement compressor, and is widely applied to the petrochemical field such as a hydrogen station and the like for compressing and conveying various high-purity gases, precious and rare gases, toxic and harmful gases and corrosive gases due to good sealing performance, wide pressure range and large compression ratio.

The diaphragm head structure of the diaphragm compressor comprises an air inlet valve, an exhaust valve, an upper stop plate, a diaphragm, a lower stop plate, a one-way valve, a piston and an oil overflow valve, wherein the inside of a diaphragm cavity is divided into an air cavity and an oil cavity by the diaphragm. In the air inlet stage, the piston moves towards the direction of the lower dead center, the diaphragm moves towards the direction of the lower dead center, the pressure in the oil cavity becomes lower, and the pressure in the air cavity also becomes lower. When the pressure of the air cavity is less than the air inlet pressure, the air inlet valve is opened, and the air enters the air cavity. And in the air inlet stage, the external plunger pump supplies oil into the oil cavity through the one-way valve, so that the oil cavity is always provided with enough hydraulic oil. The air intake ends when the piston moves to the bottom dead center, and then the piston moves to the top dead center. The piston moves upwards to push hydraulic oil to further push the diaphragm to move upwards, the volume of the air cavity is reduced, the gas is compressed, when the pressure in the air cavity is greater than the exhaust pressure, the exhaust valve is opened, and the exhaust stage is started until the diaphragm pushes against the upper stop plate. Because the stroke volume of the piston is slightly larger than the volume of the diaphragm cavity, the piston moves upwards at the moment, the volume of the oil cavity is not changed any more, and the oil pressure rises rapidly. When the oil pressure exceeds the set pressure of the oil spilling valve, the oil spilling valve is opened, the hydraulic oil flows out through the oil spilling valve until the piston moves to the top dead center, and then the piston starts to move to the bottom dead center again to enter the next process.

The highest pressure that oil pressure can reach in the oil cavity when the exhaust is finished depends on the set pressure of an oil spill valve, the traditional diaphragm compressor adopts the oil spill valve which cannot be followed, and the oil spill pressure does not change along with the change of the exhaust pressure. When the exhaust pressure changes, the oil spilling pressure of the oil spilling valve needs to be set to be 1.1-1.15 times of the maximum exhaust pressure, so that when the oil spilling valve works under the state of non-maximum exhaust pressure, the oil-gas pressure difference is too large when the exhaust is finished, and the service life of the diaphragm is reduced.

The existing part of diaphragm compressors also adopts a slave valve structure, but the slave valves divide exhaust into a branch to the gas side of an oil spill valve, and adopt a diaphragm to separate gas and hydraulic oil, the oil spill valve structure is equivalent to a small diaphragm machine, the diaphragm of the oil spill valve structure is a quick-wear part, on one hand, the diaphragm needs to be replaced periodically, and on the other hand, the failure rate of the system is increased by adding one set of diaphragm.

Disclosure of Invention

1. Technical problem to be solved

Based on high-pressure diaphragm compressor, especially high-pressure diaphragm compressor for hydrogenation station, the exhaust pressure is from little to big continuously to increase, adopt traditional oil spill valve to control the oil pressure, need set up oil spill valve oil spill pressure for 1.1 ~ 1.15 times of the highest exhaust pressure, lead to the oil gas pressure difference of compressor in most operating time too big, not only make compressor power increase, still can make the diaphragm atress too big, influence the diaphragm life-span, be unfavorable for the problem of the safe and stable operation of compressor, the application provides an oil gas pressure companion controlling means.

2. Technical scheme

In order to reach foretell purpose, this application provides a diaphragm compressor oil pressure accompanies controlling means, valve gap and valve body including interconnect, be provided with the piston in the valve gap, piston one end with the valve gap forms low pressure oil pocket, the piston other end is arranged in the valve body, the valve body with the piston other end forms the overflow chamber, be provided with the case on the valve body, the valve body with the case passes through attach fitting and connects, be provided with high-pressure oil feed passageway in the attach fitting, be provided with the oil spilling passageway in the case, oil spilling passageway one end is connected with jam subassembly one end, it is connected with valve rod one end to block up the subassembly other end, the valve rod set up in the valve body, the valve rod other end with the piston is connected. The sectional area of the piston is larger than that of the valve core overflow channel.

Another embodiment provided by the present application is: the piston is internally provided with a guide assembly, the guide assembly is connected with a cushion block, and the cushion block is connected with an elastic component.

Another embodiment provided by the present application is: the valve rod passes through the elastic component and the cushion block in sequence, and the other end of the valve rod is arranged in the guide assembly.

Another embodiment provided by the present application is: an overflow port is arranged on the valve body.

Another embodiment provided by the present application is: the connecting joint is connected with the oil cylinder of the diaphragm compressor.

Another embodiment provided by the present application is: the valve body is detachably connected with the valve cover.

Another embodiment provided by the present application is: the blocking component is a steel ball. The overflow channel and the steel balls can be pressed and sealed.

The application also provides a diaphragm compressor oil pressure accompanying control system, which comprises the diaphragm compressor oil pressure accompanying control device of any one of claims 1-7.

Another embodiment provided by the present application is: the diaphragm compressor oil pressure accompanying control device is connected with the diaphragm compressor, the diaphragm compressor oil pressure accompanying control device is connected with the gear pump, the diaphragm compressor oil pressure accompanying control device is connected with the proportional overflow valve, and the proportional overflow valve is connected with the gear pump. And low-pressure oil at the outlet of the gear pump is communicated to the low-pressure oil cavity.

Another embodiment provided by the present application is: the diaphragm compressor is connected with the pressure transmitter. The pressure transmitter collects exhaust pressure and converts the exhaust pressure into an electric signal to control the proportional overflow valve, the oil pressure of the outlet of the gear pump is controlled through the proportional overflow valve, the oil pressure of the diaphragm compressor is controlled through the oil pressure of the outlet of the gear pump along with the overflow pressure of the control device, and the oil pressure peak value of the diaphragm compressor is controlled in a follow-up mode.

One end of the connecting joint is tightly pressed on the valve core seal, the other end of the connecting joint is connected to the oil cylinder of the diaphragm compressor, and the connecting joint is internally provided with an oil hole which is used for communicating the valve core overflow channel with the oil cavity of the diaphragm compressor.

3. Advantageous effects

Compared with the prior art, the diaphragm compressor oil pressure companion control device that this application provided has:

the application provides a diaphragm compressor oil pressure companion controlling means, mainly used high pressure diaphragm compressor oil pressure companion control.

The application provides a diaphragm compressor oil pressure accompanies controlling means adopts a neotype oil gas pressure to accompany controlling means for oil spilling pressure changes along with the exhaust pressure, thereby makes diaphragm both sides pressure differential keep at relatively lower level, is favorable to diaphragm compressor's safety and stability to operate, reduces the fault rate.

The application provides a diaphragm compressor oil pressure accompanying control device, and provides a new control mode aiming at the problem that the oil spilling pressure of a high-pressure diaphragm compressor is not easy to change along with the exhaust pressure, a diaphragm type servo valve structure is broken through, a supercharger structure is designed, the overflow pressure of high-pressure oil is controlled through low-pressure oil, a proportional overflow valve is controlled through the exhaust pressure, and the pressure of the low-pressure oil is controlled through the proportional overflow valve so as to control the oil spilling pressure of the diaphragm compressor.

The application provides a diaphragm compressor oil pressure companion controlling means does not adopt the diaphragm structure just can realize the follow-up of hydraulic oil spilling oil pressure and exhaust pressure, has reduced the complexity and the fault rate of system, and the exhaust pressure converts the signal of telecommunication into simultaneously and controls spilling oil pressure, and gas can not contact with oil, does not have gaseous risk by oil pollution completely.

The application provides a diaphragm compressor oil pressure companion controlling means can realize that oil gas pressure accompanies, and oil spilling pressure changes along with the exhaust pressure change, makes oil gas pressure differential remain throughout at lower level, can reduce the energy consumption but increase diaphragm life-span again.

The application provides a diaphragm compressor oil pressure companion controlling means, does not have the diaphragm structure in the slave valve, does not have the vulnerable part, does not need frequent replacement part, and the relative diaphragm formula slave valve greatly reduced the fault rate of this structure simultaneously.

The application provides a diaphragm compressor oil gas pressure companion controlling means, does not have the diaphragm structure in the slave valve, then need not to set up the diaphragm and breaks detecting system, reduces system complexity.

Drawings

FIG. 1 is a schematic view of the diaphragm compressor oil pressure accompanying control device of the present application;

FIG. 2 is a schematic view of the hydrocarbon pressure accompanying control principle of the present application;

in the figure: the hydraulic control valve comprises a valve cover 1, a valve body 2, a piston 3, a low-pressure oil cavity 4, an overflow cavity 5, a valve core 6, a connecting joint 7, a high-pressure oil inlet channel 8, a blocking component 9, a valve rod 10, a guide component 11, a cushion block 12, an elastic component 13, an overflow port 14, a diaphragm compressor 15, a diaphragm compressor oil pressure accompanying control device 16, a gear pump 17, a proportional overflow valve 18, a pressure transmitter 19 and an O-shaped ring 20.

Detailed Description

Hereinafter, specific embodiments of the present application will be described in detail with reference to the accompanying drawings, and it will be apparent to those skilled in the art from this detailed description that the present application can be practiced. Features from different embodiments may be combined to yield new embodiments, or certain features may be substituted for certain embodiments to yield yet further preferred embodiments, without departing from the principles of the present application.

At present, diaphragm machine manufacturers also use a diaphragm type slave valve, hydraulic oil enters one side of a diaphragm through an oil port, compressed gas enters the other side of the diaphragm through a gas inlet, when gas pressure is greater than oil pressure of the oil port of the oil, the diaphragm in the diaphragm type slave valve is pushed to one side of the deflected oil by gas pressure, the oil continuously enters from the oil port until accumulated hydraulic pressure is enough to push the diaphragm to the other side of the deflected oil, and the pressure is maintained at the value until the next working cycle. The oil spilling valve structure can realize that the oil spilling pressure of the oil spilling valve changes along with the change of the exhaust pressure. But the problems in the prior art are that: high-pressure gas and hydraulic oil are being acted on at the diaphragm both ends among the diaphragm formula servovalve to roll over repeatedly under the variation of size of two power, easily arouse the diaphragm to damage, not only the diaphragm need adopt special material preparation, and the price is higher, and often need change the diaphragm, in addition, in case the diaphragm takes place to damage, fluid pollutes compressed gas in sneaking into compressed gas through the air inlet easily.

In addition, for the diaphragm machine needing fault monitoring, a set of diaphragm rupture detection system is added in the follow-up valve, so that the complexity and the cost of the system are greatly increased. In addition to this, the risk of contamination of the gas with oil increases once the membrane breaks.

Referring to fig. 1-2, the application provides a diaphragm compressor oil pressure accompanies controlling means, valve gap 1 and valve body 2 including interconnect, be provided with piston 3 in the valve gap 1, piston 3 one end with valve gap 1 forms low pressure oil pocket 4, the piston 3 other end is arranged in the valve body 2, valve body 2 with the other end of piston 3 forms overflow chamber 5, be provided with case 6 on the valve body 2, valve body 2 with case 6 passes through attach fitting 7 to be connected, be provided with high-pressure oil feed passageway 8 in the attach fitting 7, be provided with the oil spilling passageway in the case 6, oil spilling passageway one end is connected with blocking up 9 one end of subassembly, block up the subassembly 9 other end and be connected with valve rod 10 one end, valve rod 10 set up in the valve body 2, the valve rod 10 other end with piston 3 connects.

Further, a guide assembly 11 is arranged in the piston 3, the guide assembly 11 is connected with a cushion block 12, and the cushion block 12 is connected with an elastic component 13. The elastic member here may be a spring.

Further, the valve rod 10 passes through the elastic member 13 and the cushion block 12 in sequence, and the other end of the valve rod 10 is arranged in the guide assembly 11.

Further, an overflow port 14 is provided on the valve body 2.

Further, the connecting joint 7 is connected with a diaphragm compressor 15 oil cylinder.

Further, the valve body 2 is detachably connected with the valve cover 1.

Further, the blocking component 9 is a steel ball. The blocking component can be a steel ball or other structures such as a conical body.

The low-pressure oil with a certain pressure is always kept in the low-pressure oil cavity 4, the pressure of the low-pressure oil acts on the steel ball, namely the blocking component 9 through the piston 3, the cushion block 12, the spring, namely the elastic component 13 and the valve rod 10 in sequence, the steel ball is tightly pressed on the valve core 6, when the high-pressure oil pressure in the high-pressure oil inlet channel 8 is higher than the oil spilling pressure, the high-pressure oil pushes the steel ball open, the high-pressure oil overflows to the overflow cavity 5 and flows out through the overflow port 14, and the high-pressure oil pressure cannot continuously rise to exceed the overflow pressure.

Wherein the sectional area of the piston 3 in the low pressure cavity is A₁The area of the overflow passage of the valve core 6 is A₂At a low oil pressure of p_lAnd then the overflow pressure is:

the present application also provides a diaphragm compressor oil pressure accompanying control system including the diaphragm compressor oil pressure accompanying control device 16 according to any one of claims 1 to 7.

Further, the diaphragm compressor oil pressure accompanying control device 16 is connected to the diaphragm compressor 15, the diaphragm compressor oil pressure accompanying control device 16 is connected to the gear pump 17, the diaphragm compressor oil pressure accompanying control device 16 is connected to the proportional relief valve 18, and the proportional relief valve 18 is connected to the gear pump 17.

Further, the diaphragm compressor 15 is connected to a pressure transmitter 19.