Rapid pressure relief system for supercritical fluid foaming

Abstract

The utility model discloses a quick pressure relief system for supercritical fluid foaming, which relates to the field of high-pressure foaming, and adopts the technical scheme that the quick pressure relief system comprises a high-pressure kettle connecting pipe connected with a high-pressure kettle, a high-pressure ball valve is arranged on the high-pressure kettle connecting pipe, and a side channel piston type pressure relief unit is arranged on the high-pressure ball valve; the side channel piston type pressure relief unit comprises a pressure relief connecting piece fixedly connected with the high-pressure ball valve, a pressure relief base is installed on the pressure relief connecting piece, a piston hole communicated with the high-pressure kettle is formed in the middle of the pressure relief base, a high-pressure piston rod is movably arranged in the piston hole, and a plurality of pressure relief channels are formed in the side wall of the piston hole; a hydraulic oil channel is further arranged on the pressure relief base and communicated with the piston hole. The high-pressure ball valve has the beneficial effects that the impact time of high-pressure fluid on the high-pressure ball valve is greatly reduced, so that the service life of the high-pressure ball valve is greatly prolonged, and the high-pressure ball valve is easier to open; the device is prevented from bearing one-way counter-acting force when high-pressure fluid is discharged, and the stability of the device is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to high pressure foaming field especially relates to a supercritical fluid foaming is with quick pressure relief system. BACKGROUND

[0002] Supercritical fluid foaming usually carries out in the sealed autoclave, and the high polymer material that needs processing is placed into the container, after a certain time temperature and pressure treatment of supercritical fluid, the pressure is released to realize the rapid stable foaming of material after the autoclave is opened quickly.

[0003] The pressure of the foaming kettle used in the present supercritical foaming technology is above 20MPa, and the gas valve of the autoclave usually adopts a high-pressure ball valve. When the ball valve is opened, it needs to be rotated by 90 degrees. When the ball valve is not fully opened, a great pressure difference is formed on both sides of the ball body in the instant of gas exhaust, and the ball body is easily deformed under the instant high-pressure impact of the gas in the autoclave, so that the ball valve cannot be sealed again, and it needs to be replaced after being used for several times, which greatly affects the production efficiency and increases the production cost. SUMMARY

[0004] In view of the above technical problems, the utility model provides a supercritical fluid foaming quick pressure relief system.

[0005] The technical scheme is that a high-pressure autoclave connecting pipe connected with the autoclave is arranged, a high-pressure ball valve is arranged on the high-pressure autoclave connecting pipe, and a side channel piston type pressure relief unit is arranged on the high-pressure ball valve.

[0006] The side channel piston type pressure relief unit comprises a pressure relief connecting piece fixedly connected with the high-pressure ball valve, a pressure relief base is arranged on the pressure relief connecting piece, a piston hole communicating with the autoclave is arranged in the middle of the pressure relief base, a high-pressure piston rod is movably arranged in the piston hole, and a plurality of pressure relief channels are formed in the side wall of the piston hole.

[0007] A hydraulic oil channel is further arranged on the pressure relief base and communicates with the piston hole.

[0008] Preferably, the pressure relief connecting piece comprises a pressure relief connecting pipe fixedly connected with the high-pressure ball valve, a connecting flange is fixedly arranged at one end of the pressure relief connecting pipe, and the pressure relief connecting piece is connected with the pressure relief base through the connecting flange.

[0009] Preferably, the pressure relief base comprises a cylindrical valve seat, a flange plate is fixedly arranged at one end of the valve seat, and the flange plate is connected with the connecting flange through bolts.

[0010] Preferably, the axis of the pressure relief channel is arranged at an angle of 30-45° with the axis of the piston hole, and the pressure relief channels are arranged in an array around the valve seat.

[0011] Preferably, a sealing groove is formed on the side of the flange plate away from the valve seat, and a sealing ring is arranged in the sealing groove between the flange plate of the pressure relief base and the connecting flange.

[0012] Preferably, the high-pressure piston rod is in a cylindrical shape as a whole, and a spherical head is arranged at the end away from the hydraulic oil channel.

[0013] Preferably, a plurality of sealing rings are arranged on the side wall of the high-pressure piston rod.

[0014] The technical scheme provided by the embodiment of the utility model has the beneficial effects that: 1) the high-pressure ball valve and the side-channel piston type pressure relief unit are connected in series, so that before the high-pressure ball valve is opened, only a large pressure difference exists between the high-pressure ball valve and the multi-channel piston type pressure relief unit, the high-pressure ball valve only bears the instantaneous impact of high-pressure fluid when the high-pressure ball valve is opened, the impact time of the high-pressure ball valve by the high-pressure fluid is greatly reduced, and the service life of the high-pressure ball valve is greatly improved;

[0015] 2) because the high-pressure ball valve is balanced on both sides at the moment of opening, the spherical head of the high-pressure ball valve is no longer impacted by the high-pressure fluid after balancing, and the high-pressure ball valve is more easily opened;

[0016] 3) the side-channel piston type pressure relief unit adopts hydraulic fluid sealing, and the movement of the high-pressure piston rod is easy to control;

[0017] 4) the high-pressure fluid in the autoclave is discharged from the four evenly distributed channels in the side-channel piston type pressure relief system, so that the device is prevented from being subjected to the one-way reaction force when the high-pressure fluid is discharged, and the stability of the device is improved;

[0018] 5) the utility model does not need to transform the existing equipment, and only needs to connect the side-channel piston type pressure relief unit at the rear part of the high-pressure ball valve to realize the above functions. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 Fig. 4 is a state diagram when the high-pressure ball valve 2 and the high-pressure piston rod 4 of the embodiment of the utility model are both in the opened state.

[0020] Fig. 2 Fig. 5 is a state diagram when the high-pressure ball valve 2 of the embodiment of the utility model is in the opened state, and the high-pressure piston rod 4 is in the blocked state.

[0021] Fig. 3 Fig. 6 is an exploded schematic view of the overall structure of the embodiment of the utility model.

[0022] Fig. 4 Fig. 7 is a partial cross-sectional schematic view of the pressure relief base of the embodiment of the utility model.

[0023] Wherein, the reference signs are: 1, autoclave connecting pipe; 2, high-pressure ball valve; 3, side channel piston pressure relief system; 4, high-pressure piston rod; 41, ball head; 5, sealing ring; 6, pressure relief base; 61, flange plate; 62, valve seat; 63, hydraulic oil channel; 64, hydraulic oil cavity; 65, piston hole; 66, pressure relief channel; 67, sealing groove; 7, bolt; 8, pressure relief connecting piece. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the utility model clearer and more apparent, the utility model will be further described in detail below in combination with the drawings and examples. Of course, the specific examples described here are only used to explain the utility model, and are not used to limit the utility model.

[0025] It should be noted that the examples in the utility model creation and the features in the examples can be combined with each other without conflict.

[0026] In the description of the utility model creation, it should be understood that the orientation or position relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model creation and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model creation. In addition, the terms "first", "second" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more features. In the description of the utility model creation, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0027] In the description of the utility model creation, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model creation can be understood through specific circumstances.

[0028] Example 1

[0029] Reference Figs. 1 to 4The utility model provides a kind of supercritical fluid foaming with quick pressure relief system, including the high-pressure kettle connecting pipe 1 being connected with high-pressure kettle, high-pressure kettle connecting pipe 1 is provided high-pressure ball valve 2, high-pressure ball valve 2 is provided side passage piston type pressure relief unit 3;

[0030] Side passage piston type pressure relief unit 3 includes the pressure relief connecting piece 8 being fixedly connected with high-pressure ball valve 2, and the pressure relief base 6 is installed on the pressure relief connecting piece 8, the middle part of the pressure relief base 6 is provided with the piston hole 65 being communicated with high-pressure kettle, the high-pressure piston rod 4 is movably arranged in the piston hole 65, and the side wall of the piston hole 65 is provided with a plurality of pressure relief channels 66;The pressure relief channel 66 is located at one end close to the pressure relief connecting piece 8, and one end of the pressure relief channel 66 is communicated with the piston hole 65, and the other end penetrates the pressure relief base 6.

[0031] The pressure relief base 6 is also provided with the hydraulic oil passage 63, and the hydraulic oil passage 63 is communicated with the piston hole 65.

[0032] The hydraulic oil cavity 64 is formed at one end of the piston hole 65 away from the pressure relief connecting piece 8, and the hydraulic oil passage 63 is located on the side wall of the hydraulic oil cavity 64, in the use process, the hydraulic oil passage 63 is connected with the small hydraulic pump through the hydraulic oil pipe, when the hydraulic pump applies hydraulic oil to the hydraulic oil cavity 64, the high-pressure piston rod 4 moves to the direction of the pressure relief connecting piece 8 under the action of the hydraulic oil, and the high-pressure piston rod 4 can block the pressure relief connecting piece 8.

[0033] The pressure relief connecting piece 8 includes the pressure relief connecting pipe being fixedly connected with the high-pressure ball valve 2, and the connecting flange is fixedly arranged at one end of the pressure relief connecting pipe, and the pressure relief connecting piece 8 is connected with the pressure relief base 6 through the connecting flange.

[0034] The pressure relief base 6 includes the valve seat 62 in cylindrical shape, the flange plate 61 is fixedly arranged at one end of the valve seat 62, and the flange plate 61 is connected with the connecting flange through the bolt 7.

[0035] The connecting flange and the flange plate 61 are designed to facilitate installation and disassembly, during installation, the construction personnel can quickly assemble components, during later maintenance, the maintenance personnel can more easily remove and replace damaged components, thereby reducing maintenance cost and time.

[0036] The axis of the pressure relief channel 66 and the axis of the piston hole 65 are arranged at 30-45 °, and the pressure relief channel 66 is circumferentially arrayed on the valve seat 62.

[0037] The pressure relief channel 66 at 30-45 ° can make the supercritical fluid flow from the piston hole 65 to the pressure relief channel 66 with a more reasonable flow angle, so that the fluid can change direction more smoothly when flowing out, and the fluid is quickly discharged by using the guiding effect of the channel.

[0038] In the embodiment, the number of pressure relief channels 66 is 3-6, preferably 4.

[0039] The flange plate 61 is provided with a circular sealing groove 67 on the side away from the valve seat 62, and a sealing ring 5 is arranged in the sealing groove 67, which is located between the flange plate 61 of the pressure relief base 6 and the connecting flange.

[0040] The sealing ring 5 is made of fluorine rubber O-shaped ring which is resistant to high temperature and high pressure, and the sealing ring 5 improves the sealing between the pressure relief connecting piece 8 and the pressure relief base 6.

[0041] The high-pressure piston rod 4 is in a cylindrical shape as a whole, and the end away from the hydraulic oil channel 63 is a ball head 41.

[0042] The high-pressure piston rod 4 with the ball head 41 can be sealed with the pressure relief connecting pipe of the pressure relief connecting piece 8, and a good sealing effect is formed, compared with the traditional flat end, the end of the ball head 41 can be more closely attached to the pressure relief connecting pipe, effectively preventing the supercritical fluid from leaking in the non-pressure relief stage.

[0043] A plurality of sealing rings are arranged on the side wall of the high-pressure piston rod 4.

[0044] The plurality of sealing rings can realize multiple sealing protection, and prevent the hydraulic oil from flowing from the gap between the high-pressure piston rod 4 and the piston hole 65 to the pressure relief channel 66.

[0045] When the utility model is used, the autoclave connecting pipe 1 is directly installed on the autoclave, and the small hydraulic pump is connected at the hydraulic oil channel 63 of the side channel piston type pressure relief system 3;

[0046] When the autoclave is pressurized, the high-pressure ball valve 2 is in a closed state, and the side channel piston type pressure relief system 3 is in a free state, and the sealing of the autoclave is realized by relying on the high-pressure ball valve 2;

[0047] When the autoclave is depressurized:

[0048] The side channel piston type pressure relief system 3 starts to work, first, the small hydraulic pump connected to the hydraulic oil channel 63 of the pressure relief base 6 injects hydraulic oil into the hydraulic oil cavity 64 to apply hydraulic pressure in the piston hole 65, at this time, the high-pressure piston rod 4 moves to the flange plate 61 end of the pressure relief base 6 under the action of the hydraulic oil, and the ball head 41 of the high-pressure piston rod 4 closes the pipe opening of the end of the pressure relief connecting piece 8, at this time, the pipe part in the pressure relief connecting piece 8 is in a sealed state;

[0049] Then, the high-pressure ball valve 2 is opened, since the volume in the pipe of the pressure relief connecting piece 8 is very small, the high-pressure ball valve 2 is opened at the moment, and the pressure balance between the autoclave and the pipe in the pressure relief connecting piece 8 is realized, in this state, the high-pressure ball valve 2 is very easy to open;

[0050] After the high-pressure ball valve 2 is fully opened, the pressure of the small hydraulic pump in the hydraulic oil passage 63 of the pressure relief base 6 is reduced, at this time the high-pressure piston rod 4 moves to the hydraulic oil cavity 64 end of the pressure relief base 6 under the action of the fluid pressure in the autoclave, when the high-pressure piston rod 4 reaches the hydraulic oil cavity, the pressure relief passage 66 is fully opened, the fluid in the autoclave is discharged along the pressure relief passage 66, since the pressure relief passage 66 is uniformly arranged along the circumference of the hydraulic oil passage 63, compared with the direct discharge of high-pressure fluid from the pipe, the reaction force received by the rapid pressure relief system when discharging pressure is smaller, and the stability is good; since the high-pressure ball valve 2 is in a fully open balanced state during this process, therefore the impact force of the supercritical fluid in the autoclave has little effect on the ball of the high-pressure ball valve 2.

[0051] The above only describes the preferred embodiments of the present application, and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A rapid pressure relief system for supercritical fluid foaming, characterized by, The utility model provides an autoclave connecting pipe (1) connected with an autoclave, wherein a high-pressure ball valve (2) is arranged on the autoclave connecting pipe (1), and a side passage piston type pressure relief unit (3) is arranged on the high-pressure ball valve (2). The side passage piston type pressure relief unit (3) comprises a pressure relief connecting piece (8) fixedly connected with the high-pressure ball valve (2), wherein a pressure relief base (6) is arranged on the pressure relief connecting piece (8), a piston hole (65) in communication with the autoclave is arranged in the middle of the pressure relief base (6), a high-pressure piston rod (4) is movably arranged in the piston hole (65), and a plurality of pressure relief channels (66) are formed in the side wall of the piston hole (65). The pressure relief base (6) is further provided with a hydraulic oil passage (63) in communication with the piston hole (65).

2. The rapid pressure relief system for supercritical fluid foaming according to claim 1, wherein The pressure relief connecting piece (8) comprises a pressure relief connecting pipe fixedly connected with the high-pressure ball valve (2), wherein a connecting flange is fixedly arranged at one end of the pressure relief connecting pipe, and the pressure relief connecting piece (8) is connected with the pressure relief base (6) through the connecting flange.

3. The rapid pressure relief system for supercritical fluid foaming according to claim 2, wherein The pressure relief base (6) comprises a cylindrical valve seat (62), wherein a flange plate (61) is fixedly arranged at one end of the valve seat (62), and the flange plate (61) is connected with the connecting flange through a bolt (7).

4. The rapid pressure relief system for supercritical fluid foaming according to claim 3, wherein The axis of the pressure relief channel (66) is arranged at an angle of 30-45° with respect to the axis of the piston hole (65), and the pressure relief channels (66) are circumferentially arranged on the valve seat (62).

5. The rapid pressure relief system for supercritical fluid foaming according to claim 3, wherein A sealing groove (67) is formed in the side of the flange plate (61) away from the valve seat (62), a sealing ring (5) is arranged in the sealing groove (67), and the sealing ring (5) is located between the flange plate (61) of the pressure relief base (6) and the connecting flange.

6. The rapid pressure relief system for supercritical fluid foaming according to claim 1, wherein The high-pressure piston rod (4) is in the shape of a cylinder as a whole, and the end away from the hydraulic oil passage (63) is in the shape of a ball head (41).

7. The rapid pressure relief system for supercritical fluid foaming according to claim 6, wherein A plurality of sealing rings are arranged on the side wall of the high-pressure piston rod (4).

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