CN111520607B - Constant-pressure variable-volume type pneumatic system gas storage device - Google Patents

Constant-pressure variable-volume type pneumatic system gas storage device Download PDF

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CN111520607B
CN111520607B CN202010317530.4A CN202010317530A CN111520607B CN 111520607 B CN111520607 B CN 111520607B CN 202010317530 A CN202010317530 A CN 202010317530A CN 111520607 B CN111520607 B CN 111520607B
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pressure
constant
air
cylinder
shaped cam
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CN111520607A (en
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王志文
王虎
熊伟
童郑人
董欣
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Dalian Maritime University
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Dalian Maritime University
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17B—GAS-HOLDERS OF VARIABLE CAPACITY
    • F17B1/00—Gas-holders of variable capacity
    • F17B1/013—Gas-holders of variable capacity with movables discs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17B—GAS-HOLDERS OF VARIABLE CAPACITY
    • F17B1/00—Gas-holders of variable capacity
    • F17B1/02—Details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/08—Mounting arrangements for vessels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
    • F17C5/06—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with compressed gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/01—Shape
    • F17C2201/0104—Shape cylindrical
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/01—Mounting arrangements
    • F17C2205/0103—Exterior arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/01—Mounting arrangements
    • F17C2205/0123—Mounting arrangements characterised by number of vessels
    • F17C2205/013—Two or more vessels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/01—Pure fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0107—Single phase
    • F17C2223/0123—Single phase gaseous, e.g. CNG, GNC
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/01—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the phase
    • F17C2225/0107—Single phase
    • F17C2225/0123—Single phase gaseous, e.g. CNG, GNC
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/03—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the pressure level
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/04—Methods for emptying or filling
    • F17C2227/044—Methods for emptying or filling by purging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/04—Methods for emptying or filling
    • F17C2227/046—Methods for emptying or filling by even emptying or filling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/04—Methods for emptying or filling
    • F17C2227/048—Methods for emptying or filling by maintaining residual pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/06—Controlling or regulating of parameters as output values
    • F17C2250/0605—Parameters
    • F17C2250/0626—Pressure

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  • General Engineering & Computer Science (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

The invention provides a constant-pressure variable-volume pneumatic system air storage device.A rodless cavity side of a constant-pressure air storage cylinder is used for receiving compressed air from an air compressor and outputting constant-pressure compressed air to an air use loop; compressed inert gas is sealed at the side of the rodless cavity of the pressurized cylinder; the special-shaped cam is of a hollow structure; the special-shaped cam is provided with a gap I and a gap II, the gap I comprises a limiting edge I and a curve sliding edge, a cross rod I is arranged at the end part of a piston rod I, and two ends of the cross rod I are respectively positioned in the two gaps I and can slide along the curve sliding edge; opening II includes spacing limit II and the limit that slides of straight line, II tip of the piston rod of pressurized cylinder set up horizontal pole II, II both ends of horizontal pole are located two respectively in opening II and can follow the limit that slides of straight line. The technical scheme of the invention solves the problems that the traditional constant volume type air storage tank has single function, cannot realize the characteristic of outputting compressed air at constant pressure and cannot meet the requirements of pressure reduction and energy conservation.

Description

Constant-pressure variable-volume type pneumatic system gas storage device
Technical Field
The invention relates to the technical field of mechanical assemblies, in particular to a constant-pressure variable-volume type pneumatic system gas storage device.
Background
The pneumatic technology uses compressed air as a working medium, the air is cheap, but the compressed air is an expensive energy carrier, a large amount of electric energy is consumed for producing the compressed air, and 50% -85% of the electric energy is wasted in the form of heat energy. In whole pneumatic system, need obtain the great compressed air of pressure through the air compressor machine, with compressed air storage in the gas holder, then through the relief pressure valve, send compressed air into the working gas circuit again, it is located between air compressor machine and the relief pressure valve that the pressure interval that is the highest among the pneumatic system is seen, the air compressor machine increases air pressure, and the relief pressure valve reduces compressed air pressure and stabilizes at the required pressure value of working gas circuit, and the centre must have the gas holder to compressed air storage buffering. During the change of the pressure of the compressed air from high to low, the consumption of energy is increased. The most ideal situation is that the gas production side pressure is equal to the gas use side pressure, while the traditional constant volume gas storage tank is mainly used for storing gas, buffering and stabilizing pressure and separating impurities, so that the dynamic balance of the gas production side and the gas use side in a pneumatic system cannot be realized, and ideal pressure reduction and energy saving cannot be realized.
The method for realizing depressurization and energy conservation which is researched at present mainly realizes the near real-time balance of compressed air and flow at a gas production side and a gas utilization side through advanced control of an air compressor (cluster), but the actual application effect of the constant-pressure variable energy-saving control of the current pneumatic system is not ideal, and the following four defects mainly exist: (1) the pressure flow prediction algorithm is not accurate enough, the core of the advanced control technology lies in the high-precision pressure flow prediction algorithm, but no good prediction algorithm is proposed at present; (2) the method has no universality, the existing compressor (cluster) control technology has poor universality and more practical application limiting conditions; (3) the heavy large-volume air storage tank is used, the traditional air storage tank in the constant-pressure variable control system has low air storage pressure and low energy density, and in order to meet the requirement of intermittent large-flow working condition, the air storage tank with the capacity much larger than that of the traditional control system is needed; (4) the compressed air production cost is high, and most small and medium-sized enterprises are not aware that the high cost of compressed air production is the absolute leading factor of the total cost of the full life cycle of the pneumatic system.
Disclosure of Invention
According to the technical problems that the traditional constant-volume air storage tank is single in function, the characteristic of outputting compressed air at constant pressure cannot be realized, and the requirement of pressure reduction and energy conservation cannot be met, the constant-pressure variable-volume pneumatic system air storage device is provided. The invention mainly uses the special-shaped cam to realize constant pressure variable capacity gas storage, can realize pressure reduction and energy saving of a pneumatic system without a high-level control mode, and can replace the traditional constant volume gas storage tank.
The technical means adopted by the invention are as follows:
a constant-pressure variable-volume type pneumatic system air storage device comprises a constant-pressure air storage cylinder, a pressure cylinder and a special-shaped cam;
the rodless cavity side of the constant-pressure air storage cylinder is a compressed air storage area and is used for receiving compressed air from an air compressor and outputting constant-pressure compressed air to an air using loop;
compressed inert gas is sealed at the side of the rodless cavity of the pressurized cylinder;
the special-shaped cam is of a hollow structure, and the constant-pressure air storage cylinder and the pressure cylinder are respectively arranged on two sides of the special-shaped cam;
the special-shaped cam is provided with two centrosymmetric notches I towards one end of the constant-pressure gas storage cylinder, each notch I comprises a limiting edge I parallel to a piston rod I of the constant-pressure gas storage cylinder and a curved sliding edge, the end part of the piston rod I is provided with a cross rod I perpendicular to the piston rod I, and two ends of the cross rod I are respectively positioned in the two notches I and can slide along the curved sliding edges;
one end, facing the compressed air cylinder, of the special-shaped cam is provided with two centrosymmetric notches II, each notch II comprises a limiting edge II parallel to the piston rod II of the compressed air cylinder and a linear sliding edge, the end part of the piston rod II is provided with a cross rod II perpendicular to the piston rod II, and two ends of the cross rod II are respectively located in the two notches II and can slide along the linear sliding edges;
and the positions of the opening I and the opening II correspond one to one.
Further, the special-shaped cam satisfies the following relational expression:
Figure GDA0003252273470000031
wherein theta is a corner of the special-shaped cam; k is a radical of1The slope of a tangent line at a certain point on the sliding edge of the curve; k is a radical of2Is the slope of the linear sliding edge; r is the rotating radius of the special-shaped cam; p is a radical ofclose0Pre-charging the pressurized cylinder with an inert gas pressure value; v. ofclose0A volume of inert gas pre-charged into the pressurized cylinder; popenThe air pressure value of the constant-pressure compressed air required to be output in the constant-pressure air storage cylinder is obtained; n is a polytropic exponent; the cross-sectional area of the constant-pressure air storage cylinder is equal to that of the pressure cylinder, and the piston area of the constant-pressure air storage cylinder is equal to that of the pressure cylinder, namely A in the formula.
Furthermore, the compressed air storage area is provided with two air path through holes which are respectively an air inlet communicated with the air compressor and an air outlet communicated with the air using loop; the air inlet is used for receiving compressed air from an air compressor, and the air outlet is used for outputting constant-pressure compressed air to the air using loop; one side of the rod cavity of the constant-pressure gas storage cylinder is directly communicated with the atmosphere.
Furthermore, a gas path through hole which can be sealed is arranged at the side of the rodless cavity of the pressure cylinder, and before the gas path through hole is sealed, compressed inert gas is introduced into the rodless cavity of the pressure cylinder through the gas path through hole; and a rod cavity of the pressurized cylinder is directly communicated with the atmosphere.
Compared with the prior art, the invention has the following advantages:
the constant-pressure variable-volume type pneumatic system gas storage device provided by the invention can replace the traditional constant-volume type gas storage tank to complete the functions of gas storage, pressure buffering and stabilization and impurity separation; the invention can realize pressure reduction and energy saving without using a traditional constant volume type air storage tank and adding a high-grade control method, and compared with the traditional constant volume type air storage tank, the invention increases the capability of outputting compressed air at constant pressure, can meet the pressure reduction and energy saving requirements of the pneumatic system at the present stage only by using a simple two-position control method, has simple structure, is easy to upgrade the traditional constant volume type air storage tank into the product of the invention, and meets the requirements of medium and small enterprises for completing product transformation and upgrading at extremely low cost.
In conclusion, the technical scheme of the invention realizes constant-pressure variable-volume gas storage by using the special-shaped cam, can realize pressure reduction and energy saving of a pneumatic system without a high-level control mode, and can replace the traditional constant-volume gas storage tank. Therefore, the technical scheme of the invention solves the problems that the traditional constant volume type air storage tank has single function, cannot realize the characteristic of outputting compressed air at constant pressure, and cannot meet the requirements of pressure reduction and energy conservation.
Based on the reasons, the invention can be widely popularized in the fields of energy storage, pneumatic energy conservation and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural view of the constant-pressure variable-volume pneumatic gas storage device of the present invention.
Fig. 2 is a longitudinal sectional view of the constant-pressure variable-volume pneumatic gas storage device according to the present invention.
Fig. 3 is a schematic structural diagram of the special-shaped cam of the invention.
In the figure: 1. a constant pressure gas storage cylinder; 2. a piston rod I; 3. a shaped cam; 4. a piston rod II; 5. a pressurized cylinder; 6. a cross bar I; 7. a limiting edge I; 8. a curved sliding edge; 9. a cross bar II; 10. a limiting edge II; 11. a linear sliding edge.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. Any specific values in all examples shown and discussed herein are to be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the absence of any contrary indication, these directional terms are not intended to indicate and imply that the device or element so referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be considered as limiting the scope of the present invention: the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.
Example 1
As shown in fig. 1-3, the present invention provides a constant pressure variable volume type pneumatic system air storage device, which comprises a constant pressure air storage cylinder 1, a pressurized cylinder 5 and a special-shaped cam 3;
the rodless cavity side of the constant-pressure air storage cylinder 1 is a compressed air storage area and is used for receiving compressed air from an air compressor and outputting constant-pressure compressed air to an air using loop; the compressed air storage area is provided with two air path through holes which are respectively an air inlet communicated with the air compressor and an air outlet communicated with the air using loop; the air inlet is used for receiving compressed air from an air compressor, and the air outlet is used for outputting constant-pressure compressed air to the air using loop; one side of the rod cavity of the constant-pressure gas storage cylinder 1 is directly communicated with the atmosphere;
compressed inert gas is sealed at the side of the rodless cavity of the pressurized cylinder 5; a gas path through hole which can be sealed is arranged at the side of the rodless cavity of the pressure cylinder 5, and before the gas path through hole is sealed, compressed inert gas is introduced into the rodless cavity of the pressure cylinder through the gas path through hole; the rod cavity of the pressurized cylinder 5 is directly communicated with the atmosphere;
the special-shaped cam 3 is of a hollow structure, and the constant-pressure gas storage cylinder 1 and the pressure cylinder 5 are respectively arranged on two sides of the special-shaped cam 3;
one end, facing the constant-pressure gas storage cylinder 1, of the special-shaped cam 3 is provided with two centrosymmetric notches I, each notch I comprises a limiting edge I7 parallel to the piston rod I2 of the constant-pressure gas storage cylinder 1 and a curved sliding edge 8, the end part of the piston rod I2 is provided with a cross rod I6 perpendicular to the piston rod I2, and two ends of the cross rod I6 are respectively located in the two notches I and can slide along the curved sliding edges 8;
one end, facing the compressed air cylinder 5, of the special-shaped cam 3 is provided with two centrosymmetric notches II, each notch II comprises a limiting edge II 10 parallel to the piston rod II 4 of the compressed air cylinder 5 and a linear sliding edge 11, the end part of the piston rod II 4 is provided with a cross rod II 9 perpendicular to the piston rod II 4, and two ends of the cross rod II 9 are respectively located in the two notches II and can slide along the linear sliding edges 11; and the positions of the opening I and the opening II correspond one to one.
Further, the shaped cam 3 satisfies the following relation:
Figure GDA0003252273470000061
wherein theta is the rotation angle of the special-shaped cam 3; k is a radical of1The slope of a tangent line at a certain point on the sliding edge 8 of the curve; k is a radical of2Is the slope of the linear sliding edge 11; r is the rotating radius of the special-shaped cam 3; p is a radical ofclose0The pressure value of the inert gas is pre-charged in the pressurized cylinder 5; v. ofclose0The volume of inert gas pre-charged in the pressurised cylinder 5; popenThe air pressure value of the constant pressure compressed air which needs to be output in the constant pressure air storage cylinder 1 is obtained; n is a polytropic exponent; the cross sectional areas of the constant-pressure air storage cylinder 1 and the pressure cylinder 5 are equal, and the piston area of the constant-pressure air storage cylinder 1 is equal to the piston area of the pressure cylinder 5, namely A in the formula; in actual operation, the value range of θ, k in the above formula2、R、pclose0、vclose0、PopenThe values of n and A can be preset by the user according to the needs, so that the slope k of the tangent line of each point on the sliding edge 8 of the curve can be obtained1The special-shaped cam 3 can be produced according to various parameters.
Further, the constant-pressure air storage cylinder 1 and the pressure cylinder 5 are both cylindrical cylinders, and the diameter of the compressed air storage area of the constant-pressure air storage cylinder 1 is larger than that of the standard cylinder.
By adopting the constant-pressure variable-volume pneumatic system gas storage device, the compressed cylinder 5 needs to be pre-filled with compressed inert gas with certain pressure in a rodless cavity before being used, the size of the filled gas pressure value is determined by the required pressure stabilizing value in a working pipeline, and any pressure stabilizing value required by the system can be obtained by filling pre-filled gas pressures with different pressures; when the air storage device works, the compressed air cylinder 5 can provide resistance for the constant-pressure air storage cylinder 1 through pre-charged compressed inert gas, and when the horizontal component force of the compressed air cylinder 5 acting on the special-shaped cam 3 through the piston rod II 4 is equal to the horizontal component force of the constant-pressure air storage cylinder 1 acting on the special-shaped cam 3 through the piston rod I2, constant-pressure compressed air can be output through the constant-pressure air storage cylinder 1;
the special-shaped cam 3 is a deformation type cam mechanism, the appearance of the special-shaped cam is greatly different from that of a traditional cam, but the action principle of the special-shaped cam and the traditional cam is the same; the special-shaped cam 3 is used for connecting the constant-pressure air storage cylinder 1 and the pressure cylinder 5, the output force of a rod cavity of the constant-pressure air storage cylinder 1 is transmitted to a rod cavity of the pressure cylinder 5 through the special-shaped cam 3, and the pressure of compressed air at the side of a rod-free cavity in the constant-pressure air storage cylinder 1 is always kept stable through the transformation action of the special-shaped cam 3; by the force applied by the piston rods on the two sides, the special-shaped cam 3 can enable the forces on the two sides to be in a balanced state all the time through the opening I and the opening II in the rotating process, the air pressure in the constant-pressure air storage cylinder 1 is kept constant, and in the process, the limiting edge I7 and the limiting edge II 10 can limit the rotating ranges of the cross rod I6 and the cross rod II 9 respectively.
When the air compressor works, compressed inert gas with certain pressure is filled in the rodless cavity side of the compressed air cylinder in advance and is sealed, compressed air with certain pressure output from the air compressor enters a compressed air storage area through an air inlet on the rodless cavity side of the constant-pressure air storage cylinder after being cooled by the aftercooler, when the pressure is increased enough to overcome the resistance provided by the compressed air cylinder, a piston rod of the constant-pressure air storage cylinder starts to move rightwards, the special-shaped cam is forced to rotate at a certain angle, the rotation is transmitted to the right side of the special-shaped cam from the left side of the special-shaped cam, a piston rod II of the compressed air cylinder moves rightwards, and the compressed inert gas in advance on the rodless cavity side of the compressed air cylinder is compressed. In the process, the pressure of the rodless cavity side of the constant-pressure air storage cylinder is always kept near a set pressure stabilizing value (the pressure stabilizing value is slightly larger than the rated working pressure of the air using loop), and the compressed air with stable pressure is continuously output to the air using loop through the air outlet hole of the rodless cavity side of the constant-pressure air storage cylinder. After the air compressor stops working, along with consumption of the air supply loop, a piston rod I of the constant-pressure air storage cylinder is pushed back by the pressure cylinder, in the process, pressure on the rodless cavity side of the constant-pressure air storage cylinder is still kept near a pressure stabilizing value until the piston rod I of the constant-pressure air storage cylinder is completely pushed back, the piston returns to the leftmost side, air storage capacity in the constant-pressure air storage device is zero at the moment, the pressure is reduced to the atmospheric pressure, and the pneumatic system stops working. This is a complete duty cycle.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (4)

1. A constant-pressure variable-volume type pneumatic system air storage device is characterized by comprising a constant-pressure air storage cylinder, a pressure cylinder and a special-shaped cam;
the rodless cavity side of the constant-pressure air storage cylinder is a compressed air storage area and is used for receiving compressed air from an air compressor and outputting constant-pressure compressed air to an air using loop;
compressed inert gas is sealed at the side of the rodless cavity of the pressurized cylinder;
the special-shaped cam is of a hollow structure, and the constant-pressure air storage cylinder and the pressure cylinder are respectively arranged on two sides of the special-shaped cam;
the special-shaped cam is provided with two centrosymmetric notches I towards one end of the constant-pressure gas storage cylinder, each notch I comprises a limiting edge I parallel to a piston rod I of the constant-pressure gas storage cylinder and a curved sliding edge, the end part of the piston rod I is provided with a cross rod I perpendicular to the piston rod I, and two ends of the cross rod I are respectively positioned in the two notches I and can slide along the curved sliding edges;
one end, facing the compressed air cylinder, of the special-shaped cam is provided with two centrosymmetric notches II, each notch II comprises a limiting edge II parallel to the piston rod II of the compressed air cylinder and a linear sliding edge, the end part of the piston rod II is provided with a cross rod II perpendicular to the piston rod II, and two ends of the cross rod II are respectively located in the two notches II and can slide along the linear sliding edges;
and the positions of the opening I and the opening II correspond one to one.
2. The air storage device of the constant-pressure variable-volume pneumatic system according to claim 1, wherein the shaped cam satisfies the following relation:
Figure FDA0003126620290000011
wherein theta is a corner of the special-shaped cam; k is a radical of1The slope of a tangent line at a certain point on the sliding edge of the curve; k is a radical of2Is the slope of the linear sliding edge; r is the rotating radius of the special-shaped cam; p is a radical ofclose0Pre-charging the pressurized cylinder with an inert gas pressure value; v. ofclose0A volume of inert gas pre-charged into the pressurized cylinder; popenThe air pressure value of the constant-pressure compressed air required to be output in the constant-pressure air storage cylinder is obtained; n is a polytropic exponent; the cross-sectional area of the constant-pressure air storage cylinder is equal to that of the pressure cylinder, and the piston area of the constant-pressure air storage cylinder is equal to that of the pressure cylinder, namely A in the formula.
3. The air storage device of claim 1, wherein the compressed air storage area is provided with two air passage through holes, namely an air inlet communicated with an air compressor and an air outlet communicated with an air using loop; the air inlet is used for receiving compressed air from an air compressor, and the air outlet is used for outputting constant-pressure compressed air to the air using loop; one side of the rod cavity of the constant-pressure gas storage cylinder is directly communicated with the atmosphere.
4. The air storage device of the constant-pressure variable-volume pneumatic system according to claim 1, wherein a sealable air passage hole is formed in the rodless cavity side of the pressurized cylinder, and before the air passage hole is sealed, compressed inert gas is introduced into the rodless cavity of the pressurized cylinder through the air passage hole; and a rod cavity of the pressurized cylinder is directly communicated with the atmosphere.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29917072U1 (en) * 1999-09-28 2000-01-13 G.E.M.A. Maschinenhandel GmbH, 45966 Gladbeck Device for filling compressed air cartridges
CN203702493U (en) * 2013-12-24 2014-07-09 江阴市合成纤维厂 Air compression system with constant-pressure air supply
CN105402593A (en) * 2015-10-22 2016-03-16 中冶南方工程技术有限公司 Gas cabinet
US9605805B2 (en) * 2013-11-04 2017-03-28 Trillium Transportation Fuels, Llc Active pressure and flow regulation system
CN207033864U (en) * 2017-08-01 2018-02-23 孙从研 A kind of constant pressure feedway

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29917072U1 (en) * 1999-09-28 2000-01-13 G.E.M.A. Maschinenhandel GmbH, 45966 Gladbeck Device for filling compressed air cartridges
US9605805B2 (en) * 2013-11-04 2017-03-28 Trillium Transportation Fuels, Llc Active pressure and flow regulation system
CN203702493U (en) * 2013-12-24 2014-07-09 江阴市合成纤维厂 Air compression system with constant-pressure air supply
CN105402593A (en) * 2015-10-22 2016-03-16 中冶南方工程技术有限公司 Gas cabinet
CN207033864U (en) * 2017-08-01 2018-02-23 孙从研 A kind of constant pressure feedway

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