A boiler steam-water separation system

Abstract

The application discloses a boiler steam-water separation system, which comprises a separation mechanism, the separation mechanism comprises a shell, a sealing circular plate is horizontally arranged in the shell, the sealing circular plate divides the shell into an upper exhaust space and a lower separation space, a connecting cylinder is arranged through the sealing circular plate, the connecting cylinder is fixedly connected with the sealing circular plate, a spiral guide plate is fixedly connected with the outer side of the lower part of the sealing circular plate, a rotating shaft is rotatably connected to the inner top of the shell, the lower end of the rotating shaft penetrates through the connecting cylinder, a separation wire mesh is arranged through the rotating shaft, and the upper end of the separation wire mesh is in contact with the lower end surface of the connecting cylinder. In actual use, the separation system utilizes the double separation mode of centrifugal separation and wire mesh separation, thereby improving the separation effect; in addition, a flowing water film can be arranged at the bottom of the separation shell, and the flowing water film can reduce the possibility of scale formation in cooperation with the flow of the water body at the bottom.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of boiler steam-water separation, in particular to a boiler steam-water separation system. BACKGROUND

[0002] During the operation of the boiler, steam-water separation is a key link to ensure the safe and efficient operation of the boiler. Accurate and efficient steam-water separation not only improves the quality of steam to meet the requirements of subsequent processes for steam purity, but also reduces scale formation, reduces boiler energy consumption, and prolongs the service life of the equipment.

[0003] At present, the traditional boiler steam-water separation method is relatively single, and single centrifugal separation or screen separation technology is mostly used. The single centrifugal method has limited separation effect.

[0004] In addition, during the steam-water separation process, the separated water body is easy to be re-atomized when it hits the dry inner wall of the separator, which makes part of the water droplets re-enter the steam, further reducing the separation effect. At the same time, the water body stays in the bottom of the separator for a long time, which is easy to form scale. When the scale accumulates to a certain extent, it will affect the separation system, resulting in the need for high-frequency regular cleaning of the scale by the workers, increasing the actual labor. SUMMARY

[0005] The purpose of the present application is to solve the problems existing in the prior art, and a boiler steam-water separation system is proposed. The separation system uses a double separation method of centrifugal separation combined with screen separation in actual use, which improves the separation effect. In addition, a flowing water film can be arranged inside the bottom of the separation shell, which can reduce the possibility of scale formation and capture the separated water body to avoid the secondary atomization of the water body hitting the dry inner wall.

[0006] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0007] A kind of boiler steam-water separation system, including separation mechanism, the separation mechanism includes shell, the sealing round plate is arranged in shell, the sealing round plate is separated into upper exhaust space and lower separation space, the sealing round plate is vertically provided with connecting cylinder, the connecting cylinder is fixedly connected with sealing round plate, the connecting cylinder is fixedly connected with helical guide vane outside the lower part of sealing round plate, the inner top of shell is rotatably connected with rotating shaft, the lower end of rotating shaft penetrates connecting cylinder, separation silk screen is vertically provided on rotating shaft, the upper end of separation silk screen is in contact with the lower end surface of connecting cylinder;Drive mechanism, the drive mechanism includes the mounting bracket mounted on the upper end of shell and fixedly connected on the upper end of shell, the drive motor is installed on the mounting bracket, the output shaft of drive motor is fixedly connected with first gear, the upper end of rotating shaft extends to outside and is installed with second gear, the first gear is engaged with second gear;Stirring mechanism, the stirring mechanism is used to promote the flowability of bottom water body;Water film forming mechanism, the water film forming mechanism is used to improve steam-water separation effect.

[0008] Preferably, the lower end of the shell is provided with a plurality of support feet, and the left side of the shell is communicated with an inlet pipe.

[0009] Preferably, the inlet pipe is communicated with the top space of the separation space, and the exhaust pipe is communicated with the exhaust space.

[0010] Preferably, the lower end of the shell is provided with a plurality of support feet, and the left side of the shell is communicated with an inlet pipe.

[0011] Preferably, the bottom of the connecting cylinder is fixedly connected with a U-shaped scraping strip on the side wall, the lower horizontal part of the U-shaped scraping strip is in contact with the separation silk screen and is slidingly connected.

[0012] Preferably, the stirring mechanism includes two guide cylinders fixedly connected to the left side of the lower end of the rotating shaft, and each of the two guide cylinders is provided with a sliding block that can slide left and right, the right side of one of the sliding blocks is elastically connected to the inner wall of the corresponding guide cylinder by a spring, the left side of each of the two sliding blocks is fixedly connected with a fixed rod, and the left ends of the two fixed rods are fixedly connected with a folded scraper.

[0013] Preferably, the water film forming mechanism includes two piston cylinders fixedly connected symmetrically, each of the two piston cylinders is provided with a piston plate that can slide left and right, the two piston plates are fixedly connected by a connecting rod, the upper end of the rotating shaft is fixedly connected with a rotating disc, the upper end of the rotating disc is eccentrically rotatably connected with a linkage rod, and the other end of the linkage rod is rotatably connected to the right side of the left piston plate.

[0014] Preferably, an annular cavity is arranged in the inner wall of the shell, an annular groove is formed in the inner wall of the shell and communicates with the annular cavity, the opposite spaces of the two piston cylinders are communicated with a first one-way pipe and a second one-way pipe, the other ends of the two first one-way pipes are commonly communicated with a first connecting pipe, the other end of the first connecting pipe communicates with the inner bottom space of the shell, the other ends of the two second one-way pipes are commonly communicated with a second connecting pipe, the other end of the second connecting pipe communicates with the annular cavity, a one-way valve is arranged in each of the first one-way pipe and the second one-way pipe, the flow direction of the one-way valve in the first one-way pipe is that the first connecting pipe unidirectionally enters the piston cylinder, and the flow direction of the one-way valve in the second one-way pipe is that the piston cylinder unidirectionally enters the annular cavity.

[0015] Compared with the prior art, the present application has the following beneficial effects:

[0016] 1. After the water vapor is guided by the spiral guide plate, the centrifugal force preliminarily separates the water body from the gas, and the residual water body is captured by the separation wire mesh when the gas body moves upward, realizing double separation. This double separation mode can effectively improve the separation efficiency, significantly improve the steam quality, and meet the demand of subsequent processes for pure steam.

[0017] 2. The driving motor drives the rotating shaft to rotate, and a part of the water body adhered to the separation wire mesh is thrown to the inner wall of the shell by the centrifugal force, and another part is scraped off by the U-shaped scraping strip. This can clean the separation wire mesh in time, avoid the water body being re-voluted by the high-speed airflow, ensure the continuous and efficient work of the separation wire mesh, and guarantee the separation effect.

[0018] 3. Through the cooperation of the liquid level sensor, the controller and the electromagnetic valve, the intelligent control of the water level in the shell is realized. When the water level is higher than the upper sensor, the water is temporarily stored, and when the water level is lower than the lower sensor, the water is discharged, while ensuring that there is water at the bottom to maintain the operation of the water film forming mechanism, ensuring the stable operation of the system and improving the overall reliability.

[0019] 4. The rotating shaft drives the folding scraper to rotate, which does not contact the inner side wall of the shell at normal speed, and only stirs the bottom water to make it in a moving state. This can effectively prevent scale formation, reduce maintenance frequency, and reduce the risk of heat conduction efficiency decline and equipment damage caused by scale accumulation.

[0020] 5. The rotating shaft drives the piston plate to move, so that the water body forms a flowing water film on the inner wall of the shell. When the water body separated by centrifugal force hits the water film, it is "stuck" and flows down along the wall, avoiding impact atomization and reducing secondary entrainment, especially for small particle size droplets, the separation effect is obvious, further improving the separation quality.

[0021] 6. The water film forming mechanism further promotes the flow of the water body at the bottom of the shell, thereby further reducing the possibility of scale formation.

[0022] In summary, the separation system, compared with the prior art, uses double separation combined with water film capture, and the separation effect is effectively improved. In addition, the water body flowing motion at the bottom of the shell effectively reduces the possibility of scale formation, and reduces the overall maintenance frequency. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 A structural schematic diagram of a boiler steam-water separation system is provided for the present application.

[0024] Figure 2 A structural schematic diagram of a driving mechanism is provided for the present application.

[0025] Figure 3 A sectional schematic diagram of Figure 2 is provided for the present application.

[0026] Figure 4 A sectional schematic diagram of Figure 1 is provided for the present application.

[0027] Figure 5 A front structural schematic diagram of Figure 4 is provided for the present application.

[0028] Figure 6 A structural schematic diagram of a rotating shaft, a separation screen and an agitating mechanism is provided for the present application.

[0029] Figure 7 A sectional structural front schematic diagram of Figure 6 is provided for the present application.

[0030] In the figure: 1 shell, 2 support foot, 3 inlet pipe, 4 exhaust pipe, 5 piston cylinder, 6 first one-way pipe, 7 first connecting pipe, 8 second one-way pipe, 9 second connecting pipe, 10 mounting frame, 11 driving motor, 12 first gear, 13 second gear, 14 rotating disc, 15 connecting rod, 16 rotating shaft, 17 piston plate, 18 linkage rod, 19 annular cavity, 20 annular groove, 21 connecting cylinder, 22 sealing disc, 23 separation screen, 24 temporary storage box, 25 liquid falling pipe, 26 normally closed electromagnetic valve, 27 liquid discharge pipe, 28 normally open electromagnetic valve, 29 U-shaped scraping strip, 30 spiral guide plate, 31 guide cylinder, 32 folded scraping plate, 33 fixed rod, 34 sliding block, 35 spring. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application.

[0032] Reference Figures 1-7The utility model provides a kind of boiler steam-water separation system, including separation mechanism, separation mechanism includes shell 1, in initial state, there is a part of water body in the bottom of shell 1, ensure the operation of subsequent water film forming mechanism, horizontally arranged with sealing round plate 22 in shell 1, sealing round plate 22 will shell 1 be divided into upper exhaust space and lower separation space, it is arranged with connecting cylinder 21 in sealing round plate 22, connecting cylinder 21 is fixedly connected with sealing round plate 22, connecting cylinder 21 is fixedly connected with helical guide vane 30 outside the lower part of sealing round plate 22, the inner top of shell 1 is rotatably connected with shaft 16, the lower end of shaft 16 is connected with connecting cylinder 21, it is arranged with separation wire screen 23 in shaft 16, the upper end of separation wire screen 23 is in contact with the lower end surface of connecting cylinder 21, when water-containing steam enters from left entering pipe 3, after being guided by helical guide vane 30, it is in the form of rotation and moves downward, under the action of centrifugal force, the water body with greater density is separated from gas, and is in contact with the inner wall of the bottom part of shell 1, and finally slides to the bottom of shell 1, while steam continues to move and finally moves upward along connecting cylinder 21, enters exhaust space and is discharged from exhaust pipe 4, in the process of moving upward, steam is in contact with separation wire screen 23, further captures the water body existing in steam, uses double separation, and improves the separation efficiency.

[0033] As an embodiment of the utility model, the lower end of shell 1 is provided with a plurality of supporting legs 2, the left side of shell 1 is communicated with an entering pipe 3, and the right side of shell 1 is provided with an exhaust pipe 4; the entering pipe 3 is communicated with the top space of the separation space, and the exhaust pipe 4 is communicated with the exhaust space.

[0034] As an embodiment of the utility model, further comprising a driving mechanism, the driving mechanism includes a mounting bracket 10 fixedly connected to the upper end of the shell 1 and mounted on the upper end of the shell 1, a driving motor 11 mounted on the mounting bracket 10, a first gear 12 fixedly connected to the output shaft of the driving motor 11, the upper end of the shaft 16 extending to the outside and being provided with a second gear 13, the first gear 12 being engaged with the second gear 13, a U-shaped scraping strip 29 fixedly connected to the sidewall of the bottom part of the connecting cylinder 21, the lower horizontal part of the U-shaped scraping strip 29 being in contact with and slidingly connected to the separation wire screen 23, in this way, the separation wire screen 23 is in the form of rotation during use, a part of the water body adhering thereto is thrown to the inner wall of the shell 1 by the centrifugal force, and the other part is scraped to the lower horizontal part of the U-shaped scraping strip 29 and gathered together to fall under the action of gravity, achieving the purpose of timely falling off of the liquid droplets, which can avoid being re-voluted by high-speed airflow, further improving the separation effect.

[0035] As an embodiment of the present application, the lower part of the shell 1 is provided with a temporary storage box 24, the inner top of the temporary storage box 24 is communicated with the inner bottom of the shell 1 through a liquid falling pipe 25, the inner bottom of the temporary storage box 24 is communicated with a liquid discharge pipe 27, a normally closed electromagnetic valve 26 is installed inside the liquid falling pipe 25, a normally open electromagnetic valve 28 is installed inside the liquid discharge pipe 27, and a controller and two liquid level sensors not shown are also provided, the two liquid level sensors are arranged from top to bottom on the inner wall of the bottom part of the shell 1, when the water level inside the shell 1 is higher than the upper liquid level sensor, the controller controls the normally open electromagnetic valve 28 and the normally closed electromagnetic valve 26 to be energized at the same time, at this time the water in the shell 1 falls into the temporary storage box 24, and when the liquid level at the bottom of the shell 1 is lower than the lower liquid level sensor, the controller controls the normally open electromagnetic valve 28 and the normally closed electromagnetic valve 26 to be de-energized at the same time, the water in the temporary storage box 24 is discharged through the liquid discharge pipe 27, it should be noted that a part of the water in the bottom of the shell 1 should be ensured at all times to ensure the operation of the water film forming mechanism.

[0036] As an embodiment of the present application, a stirring mechanism is also included, the stirring mechanism is used to promote the flowability of the water at the bottom, the stirring mechanism includes two guide cylinders 31 fixedly connected to the left side of the lower end of the rotating shaft 16, two sliding blocks 34 which can slide left and right are arranged in the two guide cylinders 31, the right side of one of the sliding blocks 34 is elastically connected to the inner wall of the corresponding guide cylinder 31 through a spring 35, the left side of each of the two sliding blocks 34 is fixedly connected with a fixed rod 33, and the left ends of the two fixed rods 33 are commonly fixedly connected with a folded scraper 32, during the water vapor separation process, the rotation of the rotating shaft 16 can make the folded scraper 32 rotate through the guide cylinder 31, the sliding block 34 and the fixed rod 33, at this time the rotation speed is not too high, so under the elastic action of the centrifugal force and the spring 35, the folded scraper 32 will not touch the inner side wall of the shell 1, avoiding damaging the water film, the rotation here only stirs the water at the bottom of the shell 1, making the water in a state of motion, not easy to form scale, reducing the maintenance frequency, and if scale appears after long-term use, only need to put water and scale remover into the shell 1, and then start the driving motor 11 to rotate at high speed, under the action of centrifugal force the folded scraper 32 will not touch the inner side wall of the shell 1, achieving the effect of scraping, facilitating the operation of scale removal.

[0037] As one embodiment of the present application, the water film forming mechanism is further included for improving the steam-water separation effect, the water film forming mechanism includes two piston cylinders 5 symmetrically fixedly connected, two piston plates 17 slidably arranged in the two piston cylinders 5, a connecting rod 15 fixedly connected between the two piston plates 17, a rotating shaft 16, an upper end of the rotating shaft 16 fixedly connected with a rotating disc 14, a linkage rod 18 rotatably connected with the rotating disc 14 at an eccentric position of an upper end of the rotating disc 14, the other end of the linkage rod 18 rotatably connected with the right side of the left piston plate 17, an annular cavity 19 arranged in the inner wall of the shell 1, an annular groove 20 arranged in the inner wall of the shell 1 and communicated with the annular cavity 19, the opposite spaces of the two piston cylinders 5 communicated with a first one-way pipe 6 and a second one-way pipe 8, the other end of the two first one-way pipes 6 commonly communicated with a first connecting pipe 7, the other end of the first connecting pipe 7 communicated with the space of the inner bottom of the shell 1, the other end of the two second one-way pipes 8 commonly communicated with a second connecting pipe 9, the other end of the second connecting pipe 9 communicated with the annular cavity 19, a one-way valve arranged in each of the first one-way pipe 6 and the second one-way pipe 8, the flow direction of the one-way valve in the first one-way pipe 6 being that the first connecting pipe 7 unidirectionally enters the piston cylinder 5, the flow direction of the one-way valve in the second one-way pipe 8 being that the piston cylinder 5 unidirectionally enters the annular cavity 19, when there is a water film on the inner wall, the water droplets in the airflow that hit the water film will be directly “stuck” and flow down along the wall surface with the water film, reducing secondary entrainment, compared with a dry inner wall, the water film is equivalent to a “capture layer” and can more efficiently trap water droplets, especially the separation effect on small particle size droplets is more obvious.

[0038] In the present application, water vapor enters the separation space of the shell 1 from the inlet pipe 3. After being guided by the spiral guide plate 30, the steam moves downward in a rotating manner. Under the action of centrifugal force, the water body with a higher density is separated from the gas and hits the inner wall of the bottom part of the shell 1, and finally slides to the inner bottom of the shell 1. The steam continues to move and enters the exhaust space along the connecting cylinder 21. In the upward movement process, the steam contacts the separation wire mesh 23, the separation wire mesh 23 further captures the water body existing in the steam, realizing double separation and improving the separation efficiency.

[0039] In the above process, the driving motor 11 is started, the output shaft drives the first gear 12 to rotate, the first gear 12 drives the rotating shaft 16 to rotate through meshing with the second gear 13, and then the separation wire mesh 23 is rotated. Part of the water body captured and adhered on the separation wire mesh 23 is thrown to the inner wall of the shell 1 by the centrifugal force, and the other part is scraped to the upper end of the horizontal part below the U-shaped scraping strip 29 and gathered together, and falls under the action of gravity, avoiding being re-voluted by the high-speed airflow, and further improving the separation effect.

[0040] When the water level inside the shell 1 is higher than the upper liquid level sensor, the controller controls the normally open electromagnetic valve 28 and the normally closed electromagnetic valve 26 to be powered on, and the water in the shell 1 falls into the temporary storage tank 24 through the liquid falling pipe 25; when the liquid level at the bottom of the shell 1 is lower than the lower liquid level sensor, the controller controls the normally open electromagnetic valve 28 and the normally closed electromagnetic valve 26 to be powered off, and the water in the temporary storage tank 24 is discharged through the liquid discharge pipe 27, while ensuring that there is always a part of the water body at the bottom of the shell 1 to ensure the operation of the water film forming mechanism;

[0041] When the rotating shaft 16 rotates, the folding scraper 32 is driven to rotate through the guide cylinder 31, the sliding block 34 and the fixed rod 33. Under normal working speed, the folding scraper 32 does not contact the inner side wall of the shell 1 under the elastic action of the centrifugal force cooperating with the spring 35, and only stirs the water body at the bottom of the shell 1, so that the water body is in a moving state and is not easy to form scale, thereby reducing the maintenance frequency.

[0042] The rotation of the rotating shaft 16 also drives the rotating disc 14 to rotate, and the rotating disc 14 drives the left piston plate 17 to reciprocate left and right through the linkage rod 18, and the left piston plate 17 drives the right piston plate 17 to move synchronously through the connecting rod 15. Taking the right piston cylinder 5 as an example, when the piston plate 17 moves to the left, a negative pressure is formed in the space on the right side of the piston cylinder 5, and the water body at the bottom of the shell 1 enters the piston cylinder 5 through the first connecting pipe 7 and the first one-way pipe 6; when the piston plate 17 moves to the right, the pressure in the space on the right side of the piston cylinder 5 increases, and the water body enters the annular cavity 19 through the second one-way pipe 8 and the second connecting pipe 9, and then flows out through the annular groove 20 to form a flowing water film on the inner wall of the shell 1. The use of two piston cylinders 5 makes the water flow in a continuous running state, so that the water film is always formed. In the above centrifugal separation process, when the water body separated by centrifugal force collides with the water film, it will be directly "stuck" by water droplets and flow down along the wall with the water film. Compared with the existing direct impact on the dry inner wall, the above-mentioned structure effectively avoids the situation of impact atomization, reduces secondary entrainment, improves the separation effect of small particle size droplets, and the steam after separation is discharged from the exhaust pipe 4. The structure further promotes the flow of the water body at the bottom of the shell 1, thereby further reducing the possibility of scale formation;

[0043] It should be noted that if scale is formed after long-term use, water and scale remover can be put into the shell 1, and the driving motor 11 is started to rotate at high speed, and the folding scraper 32 scrapes the inner side wall of the shell 1 to facilitate scale removal.

[0044] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent replacement or change according to the technical scheme and inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A boiler water-steam separation system, characterized in that The utility model relates to a water film type gas-liquid separation device, including: Separation mechanism, separation mechanism includes the casing (1), the sealing round plate (22) is arranged in the casing (1) horizontally, the sealing round plate (22) separates the casing (1) into the upper exhaust space and the lower separation space, the connecting cylinder (21) is arranged on the sealing round plate (22), the connecting cylinder (21) is fixedly connected with the sealing round plate (22), the connecting cylinder (21) is fixedly connected with the helical guide vane (30) on the outside of the lower part of the sealing round plate (22), the inner top of the casing (1) is rotatably connected with the rotating shaft (16), the lower end of the rotating shaft (16) penetrates the connecting cylinder (21), the separating wire mesh (23) is arranged on the rotating shaft (16), and the upper end of the separating wire mesh (23) is in contact with the lower end surface of the connecting cylinder (21); Driving mechanism, the driving mechanism includes the mounting frame (10) installed on the upper end of the casing (1) and fixedly connected on the upper end of the casing (1), the driving motor (11) is installed on the mounting frame (10), the output shaft of the driving motor (11) is fixedly connected with the first gear (12), the upper end of the rotating shaft (16) extends to the outside, and the second gear (13) is installed, and the first gear (12) is engaged with the second gear (13); Agitation mechanism, the agitation mechanism is used for promoting the flowability of the bottom water body, and the agitation mechanism includes two guide cylinders (31) fixedly connected on the lower end left side of the rotating shaft (16), the two guide cylinders (31) are provided with slidable sliding blocks (34) in the two guide cylinders (31), the right side of one of the sliding blocks (34) is elastically connected with the inner wall of the corresponding guide cylinder (31) through the spring (35), and the left sides of the two sliding blocks (34) are fixedly connected with fixed rods (33); the left ends of the two fixed rods (33) are fixedly connected with the folded scraper (32) in common. Water film forming mechanism, the water film forming mechanism is used for improving the gas-liquid separation effect, and the water film forming mechanism includes two piston cylinders (5) fixedly connected in pairs, the two piston cylinders (5) are provided with piston plates (17) that can slide left and right in the two piston cylinders (5), the two piston plates (17) are fixedly connected with the cylinder connecting rod (15), the upper end of the rotating shaft (16) is fixedly connected with the rotating disc (14), the upper end eccentric portion of the rotating disc (14) is rotatably connected with the linkage rod (18), and the other end of the linkage rod (18) is rotatably connected with the right side of the left piston plate (17).

2. A boiler water separation system according to claim 1, wherein The lower end of the casing (1) is provided with a plurality of supporting legs (2), the left side of the casing (1) is communicated with the inlet pipe (3), and the right side of the casing (1) is provided with the exhaust pipe (4).

3. A boiler water separation system according to claim 2, wherein The inlet pipe (3) is communicated with the top space of the separation space, and the exhaust pipe (4) is communicated with the exhaust space.

4. A boiler water separation system as claimed in claim 1, wherein, The lower part of the shell (1) is provided with a temporary storage box (24), the inner top of the temporary storage box (24) is communicated with the inner bottom of the shell (1) through a liquid falling pipe (25), the inner bottom of the temporary storage box (24) is communicated with a liquid discharge pipe (27), the inside of the liquid falling pipe (25) is provided with a normally closed electromagnetic valve (26), and the inside of the liquid discharge pipe (27) is provided with a normally open electromagnetic valve (28).

5. A boiler water separation system as claimed in claim 1, wherein, The bottom part of the connecting barrel (21) is fixedly connected with a U-shaped scraping strip (29), and the lower horizontal part of the U-shaped scraping strip (29) is in contact with the separation wire mesh (23) and is connected in a sliding mode.

6. A boiler water separation system as claimed in claim 1, wherein, The inner wall of the shell (1) is provided with an annular cavity (19), the inner wall of the shell (1) is provided with an annular groove (20) communicated with the annular cavity (19), the opposite sides of the two piston barrels (5) are communicated with a first one-way pipe (6) and a second one-way pipe (8), the other ends of the two first one-way pipes (6) are commonly communicated with a first connecting pipe (7), the other end of the first connecting pipe (7) is communicated with the inner bottom space of the shell (1), the other ends of the two second one-way pipes (8) are commonly communicated with a second connecting pipe (9), the other end of the second connecting pipe (9) is communicated with the annular cavity (19), and the inside of each first one-way pipe (6) and second one-way pipe (8) is provided with a one-way valve. The one-way valve in the first one-way pipe (6) flows in the direction of the first connecting pipe (7) unidirectionally into the piston barrel (5), and the one-way valve in the second one-way pipe (8) flows in the direction of the piston barrel (5) unidirectionally into the annular cavity (19).

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