CN110374844B

CN110374844B - Cooling structure for cylinder cover of diaphragm compressor

Info

Publication number: CN110374844B
Application number: CN201910690087.2A
Authority: CN
Inventors: 贾晓晗; 任省栋; 汪婷; 彭学院
Original assignee: Xian Jiaotong University
Current assignee: Xian Jiaotong University
Priority date: 2019-07-29
Filing date: 2019-07-29
Publication date: 2020-06-26
Anticipated expiration: 2039-07-29
Also published as: CN110374844A

Abstract

The application belongs to the technical field of compressors, and particularly relates to a cooling structure for a cylinder cover of a diaphragm compressor. The diaphragm compressor is generally larger in pressure ratio, a cylinder cover is thicker, exhaust temperature is higher, and compression heat in a diaphragm cavity is difficult to be led out in time through surface heat exchange of the cylinder cover. Therefore, the integral temperature of the cylinder cover is high, so that the thermal stress of the cylinder cover cannot be ignored, the pressure valve cover and the exhaust flange bolt are loosened, and the operation safety of the system is endangered. The application provides a diaphragm compressor cylinder cap cooling structure, including the cylinder cap, be provided with the heat pipe on the cylinder cap, heat pipe one end set up in the cylinder cap, the heat pipe other end is free. The heat pipe with high heat flow density is adopted for heat dissipation, the evaporation section of the heat pipe is as close to the central high-temperature area as possible, the heat in the central high-temperature area is led out, and the temperature of a cylinder cover and exhaust gas is reduced.

Description

Cooling structure for cylinder cover of diaphragm compressor

Technical Field

The application belongs to the technical field of compressors, and particularly relates to a cooling structure for a cylinder cover of a diaphragm compressor.

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. In the diaphragm compressor, working oil in an oil cavity of a cylinder is pushed through a piston, and then a diaphragm is pushed to reciprocate in the diaphragm cavity, so that the working volume of an air cavity is changed, and a leakage-free periodic working process is realized under the coordination of an air suction valve and an air discharge valve.

Because of the diaphragm compressor is generally bigger than, especially high-pressure diaphragm compressor cylinder cap is thicker again, and the high pressure ratio leads to exhaust temperature higher, and the cylinder cap is thicker, and the surface heat transfer through the cylinder cap is difficult in time to derive the compression heat in the membrane chamber. Therefore, the integral temperature of the cylinder cover is high, so that the thermal stress of the cylinder cover cannot be ignored, the pressure valve cover and the exhaust flange bolt are loosened, and the operation safety of the system is endangered. The temperature in the diaphragm cavity of the diaphragm compressor is high, the temperature of hydraulic oil can be increased through heat conduction of the diaphragm, the aging of the hydraulic oil can be accelerated due to the overhigh temperature of the hydraulic oil, the lubricating conditions of all moving parts can be severe after the hydraulic oil is polluted, and the abrasion of all moving parts can be accelerated. The increase of the temperature of the hydraulic oil can also cause the increase of the air separation pressure and the saturated vapor pressure in the hydraulic oil, so that the cavitation phenomenon is easier to occur, and the pressure fluctuation of a hydraulic system occurs.

Disclosure of Invention

1. Technical problem to be solved

Based on that diaphragm compressor pressure is big, the cylinder cap is thicker, exhaust temperature is higher, therefore the cylinder cap bulk temperature is higher for the thermal stress of cylinder cap is great, leads to the pressure valve lid and the exhaust flange bolt is not hard up, endangers system operation safety, and the temperature is higher in the diaphragm chamber, still can make hydraulic oil temperature rise through diaphragm heat conduction, and hydraulic oil temperature too high can be ageing-accelerated, and hydraulic oil pollutes the back, can make each moving part lubricating condition become abominable, the wearing and tearing of each moving part with higher speed. The hydraulic oil temperature rise can also lead to air separation pressure and saturated vapor pressure in the hydraulic oil to rise, makes cavitation more easy to take place for hydraulic system appears the problem of pressure fluctuation, and the application provides a diaphragm compressor cylinder cap cooling structure.

2. Technical scheme

In order to reach foretell purpose, this application provides a diaphragm compressor cylinder cap cooling structure, including the cylinder cap, be provided with the heat pipe on the cylinder cap, heat pipe one end set up in the cylinder cap, the heat pipe other end is free.

Optionally, be provided with the aperture in the cylinder cap, the heat pipe includes interconnect's evaporation zone and condensation segment, the evaporation zone set up in the aperture.

Optionally, the evaporation section and the condensation section are perpendicular to each other.

Optionally, a heat-conducting adhesive layer is arranged between the evaporation section and the small hole wall.

Optionally, the condensing section is externally provided with fins.

Optionally, the aperture is close to the discharge valve, the evaporation zone is close to the discharge valve, and the condensation zone is close to the cylinder head side wall.

Optionally, the heat pipe is a wick heat pipe.

3. Advantageous effects

Compared with the prior art, the diaphragm compressor cylinder cap cooling structure that this application provided has:

the application provides a diaphragm compressor cylinder cap cooling structure, through set up the heat pipe in the cylinder cap, it is big to focus on central zone and thermal current density to diaphragm compressor high temperature, and the heat is difficult for the characteristics of deriving, breaks traditional diaphragm compressor cylinder cap cooling method, adopts the heat pipe of high thermal current density to dispel the heat, and the heat pipe evaporation zone is close central high temperature zone as far as possible, derives central high temperature zone's heat, reduces cylinder cap and exhaust temperature. The high-temperature area of the diaphragm compressor is mainly concentrated around the exhaust valve, the heat of the high-temperature area is led out, and the reduction of the temperature of the cylinder cover and the diaphragm cavity has important significance for the safe operation of the diaphragm compressor.

Drawings

FIG. 1 is a schematic cross-sectional view of a diaphragm compressor head construction of the present application;

FIG. 2 is a schematic top sectional view of the present application showing the height of the heat pipe;

FIG. 3 is a schematic view of the heat pipe operation of the present application;

in the figure: 1-cylinder cover, 2-heat pipe, 3-evaporation section, 4-condensation section, 5-fin, 6-exhaust valve, 7-cylinder body, 8-diaphragm, 9-air inlet valve, 10-oil distribution disc, 11-stud, 12-bolt, 13-air inlet connecting pipe, 14-pressure valve cover and 15-exhaust connecting pipe.

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.

The existing cooling scheme is that a cooling water channel is formed in the cylinder cover, and water or oil is introduced for cooling. The high-temperature area of the diaphragm compressor is mainly concentrated near the exhaust valve in the central area, exhausted high-temperature airflow always passes through the high-temperature area, the heat flux density is high, the cylinder cover is cooled by convection heat exchange of cooling water and the wall surface of the water channel in the cylinder cover in the traditional cooling method, the heat flux density is low, a large amount of heat in the central high-temperature area cannot be taken away in time, the temperature near the exhaust valve is still high, and the cooling effect is not obvious.

Diaphragm compressor pressure ratio is general higher, and exhaust temperature that the high-pressure ratio leads to is higher, leads to the whole temperature on the high side of cylinder cap, and cylinder cap thermal stress grow. The invention is adopted to cool the cylinder cover, thereby reducing the temperature of the cylinder cover, reducing the influence of thermal stress and simultaneously reducing the exhaust temperature.

The heat pipe (heat pipe) technology is widely applied to the industries of aerospace, military industry and the like in the past, and since the heat pipe (heat pipe) technology is introduced into the radiator manufacturing industry, the design idea of the traditional radiator is changed for people, the single heat radiation mode that a better heat radiation effect is obtained by only depending on a high-air-volume motor is eliminated, the heat pipe technology is adopted to ensure that the heat radiator can obtain a satisfactory effect even if the heat radiator adopts a low-rotating-speed low-air-volume motor, the noise problem which troubles air cooling heat radiation is well solved, and the heat radiation industry is opened up. Now commonly found on the heat sink of cpu.

From a thermodynamic perspective, why will a heat pipe possess such good thermal conductivity? The heat absorption and the heat release of the object are relative, and the phenomenon that the heat is transferred from a high-temperature position to a low-temperature position necessarily occurs when a temperature difference exists. From the three modes of heat transfer (radiation, convection, conduction), the heat conduction is fastest. The heat pipe is used for evaporation refrigeration, so that the temperature difference between two ends of the heat pipe is large, and heat is conducted quickly. A typical heat pipe consists of a pipe shell, a wick, and end caps. The interior of the heat pipe is pumped into a negative pressure state and filled with proper liquid, and the liquid has a low boiling point and is easy to volatilize. The tube wall has a wick that is constructed of a capillary porous material. When one end of the heat pipe is heated, the liquid in the capillary tube is rapidly evaporated, the vapor flows to the other end under a slight pressure difference and releases heat to be condensed into liquid again, and the liquid flows back to the evaporation end along the porous material under the action of capillary force, so that the heat is not circulated and transferred from one end of the heat pipe to the other end. This cycle is rapid and heat can be conducted away from the heat source.

Referring to fig. 1 ~ 3, the application provides a diaphragm compressor cylinder cap cooling structure, including cylinder cap 1, be provided with heat pipe 2 on the

cylinder cap

1, 2 one end of heat pipe set up in the cylinder cap 1, the 2 other ends of heat pipe are free.

The heat pipe 2 is here partly arranged inside the cylinder head 1 and partly outside the cylinder head 1.

The oil distribution disc 10 is detachably connected between the cylinder cover 1 and the cylinder body 7, a diaphragm 8 is arranged above the oil distribution disc 10, and the cylinder cover 1, the diaphragm 8, the oil distribution disc 10 and the cylinder body 7 are fixedly connected through a stud 11 and a bolt 12. An air cavity is formed between the cylinder cover 1 and the diaphragm 8, and an oil cavity is formed between the cylinder body 7 and the diaphragm 8. The cylinder cover 1 is provided with an air inlet valve 9 and an air outlet valve 6, and the air inlet valve 6 and the air outlet valve 6 are pressed on the valve steps by a valve pressing cover 14 through a pressing air inlet connecting pipe 13 and an air outlet connecting pipe 15.

Further, be provided with the aperture in the cylinder cap 1, heat pipe 2 includes interconnect's evaporation zone 3 and condensation segment 4, evaporation zone 3 set up in the aperture.

Further, the evaporation section 3 and the condensation section 4 are perpendicular to each other.

Further, a heat-conducting adhesive layer is arranged between the evaporation section 3 and the small hole wall.

Further, the condensing section 4 is externally provided with fins 5.

Further, the aperture is close to discharge valve 6, evaporation zone 2 is close to discharge valve 6, condensation zone 4 is pressed close to 1 lateral wall of cylinder cap.

Since the intake air temperature is generally low and the exhaust air temperature is high, the heat pipe 2 is disposed mainly near the exhaust valve 6 side. When the compressor works, the temperature near the exhaust valve 6 is rapidly raised, the working medium in the heat pipe 2 is evaporated and absorbed a large amount of heat in the heat pipe evaporation section 3, the heat is condensed and released in the heat pipe condensation section 4, and the heat is dissipated to the environment through the fins 5. Thereby realizing the cooling of the cylinder cover 1 and the compressed gas.

Further, the heat pipe 2 is a wick heat pipe.

The cylinder cover 1 is punched, the bottom of the hole is close to the exhaust valve 7 as much as possible, the heat pipe 2 is arranged in the hole, and a heat conducting adhesive layer is arranged between the heat pipe 2 and the wall of the hole to reduce the contact thermal resistance. In order to reduce the overall occupied space of the machine, the heat pipe 2 should be bent by 90 degrees, and the condensation section 4 of the heat pipe 2 should be close to the side wall surface of the cylinder cover as much as possible, as shown in fig. 2.

When the compressor operates, the oil pressure change in the oil cavity pushes the diaphragm 8 to deform, gas in the gas cavity is compressed, and the compressed high-temperature gas is discharged through the exhaust valve 6 and the exhaust connecting pipe 15 in sequence, so that the surrounding temperature of the exhaust valve 6 through which the high-temperature gas flows is higher, and the high-temperature region is the central high-temperature region of the cylinder cover.

As shown in figure 3, the working medium in the heat pipe 2 evaporates in the heat pipe evaporation section 3 and takes away the heat in the central high temperature area, the steam moves to the heat pipe condensation section 4 under the push of the pressure difference in the heat pipe 2 to be condensed and release the heat and is dissipated to the environment through the fins 5, the liquid medium moves to the heat pipe evaporation section 3 under the action of the capillary force of the heat pipe to work circularly, because the heat pipe 2 has high heat flux density due to the phase change heat exchange, a large amount of heat can be taken away from the central high temperature area of the cylinder cover continuously, and the purpose of reducing the temperature of the cylinder cover 1 and the.

The cooling structure of the cylinder cover of the diaphragm compressor is simple in structure and easy to process; compared with the traditional water cooling or oil cooling, the water cooling and oil cooling device reduces the consumption of cooling water and oil, and is more energy-saving and environment-friendly. The traditional heat exchange mode is changed, the phase change heat exchange of the heat pipe is used, the heat flow density is high, and the cooling effect is good.

The application provides a diaphragm compressor cylinder cap cooling structure through set up heat pipe 2 in cylinder cap 1, concentrates on central zone and heat flux density big to diaphragm compressor high temperature, and the heat is difficult for the characteristics of deriving, breaks traditional diaphragm compressor cylinder cap cooling method, adopts the heat pipe of high heat flux density to dispel the heat, and evaporation zone 3 is close central high-temperature area as far as possible, derives the heat in central high-temperature zone, reduces cylinder cap and exhaust temperature. The high-temperature area of the diaphragm compressor is mainly concentrated around the exhaust valve 6, the heat of the high-temperature area is led out, and the reduction of the temperature of the cylinder cover 1 and the diaphragm cavity has important significance for the safe operation of the diaphragm compressor.

The application is to cool the cylinder cover 1, reduce the thermal stress of the cylinder cover 1, and have an additional effect on the reduction of the exhaust temperature, and the structure has a very limited reduction of the exhaust temperature.

Although the present application has been described above with reference to specific embodiments, those skilled in the art will recognize that many changes may be made in the configuration and details of the present application within the principles and scope of the present application. The scope of protection of the application is determined by the appended claims, and all changes that come within the meaning and range of equivalency of the technical features are intended to be embraced therein.

Claims

1. The utility model provides a diaphragm compressor cylinder cap cooling structure which characterized in that: the cylinder cover comprises a cylinder cover (1), wherein a heat pipe (2) is arranged on the cylinder cover (1), one end of the heat pipe (2) is arranged in the cylinder cover (1), and the other end of the heat pipe (2) is free; be provided with the aperture in cylinder cap (1), heat pipe (2) are including interconnect's evaporation zone (3) and condensation segment (4), evaporation zone (3) set up in the aperture.

2. The diaphragm compressor head cooling structure of claim 1, wherein: the evaporation section (3) and the condensation section (4) are perpendicular to each other.

3. The diaphragm compressor head cooling structure of claim 1, wherein: and a heat-conducting adhesive layer is arranged between the evaporation section (3) and the small hole wall.

4. The diaphragm compressor head cooling structure of claim 1, wherein: and fins (5) are arranged outside the condensation section (4).

5. The diaphragm compressor head cooling structure of claim 1, wherein: the aperture is close to discharge valve (6), evaporation zone (2) are close to discharge valve (6), condensation zone (4) are pressed close to cylinder cap (1) lateral wall.

6. The cooling structure of the cylinder cover of the diaphragm compressor as claimed in any one of claims 1 to 5, wherein: the heat pipe (2) is a cored heat pipe.