A water quality detection sampler that avoids clogging by debris and can sample at a fixed depth

Abstract

The present invention discloses a water quality detection sampler that can avoid clogging by debris and can take samples at a fixed depth, comprising a cantilever, an electric telescopic rod, the electric telescopic rod is fixedly installed on the top surface of the cantilever, and the output end of the electric telescopic rod slides through the cantilever arrangement; a fixed cylinder, the fixed cylinder is fixedly installed on the output end of the electric telescopic rod; a sampling cylinder, the sampling cylinder is fixedly installed through the bottom surface of the fixed cylinder; a filter screen, the filter screen is fixedly installed through the bottom of the sampling cylinder; a rotating mechanism, the rotating mechanism is arranged on the inner top surface of the fixed cylinder. The water quality detection sampler that can avoid clogging by debris and can take samples at a fixed depth can facilitate the sampling of water by avoiding clogging by debris, ensure stable and effective sampling, and ensure the implementation of water quality detection work. At the same time, it can facilitate sampling at a fixed depth, realize sampling of waters of different depths, and ensure the diversity and accuracy of water quality detection data.

Description

Technical Field

[0001] The invention relates to the field of water quality detection sampling technology, in particular to a water quality detection sampler which can avoid clogging by debris and can sample at a fixed depth. Background Art

[0002] Water quality testing plays an important role in maintaining environmental health, but existing water quality testing samplers still have certain defects, such as:

[0003] The "water quality detection sampler" with application number CN202321398988.2 is not convenient to isolate debris in the water during sampling, and it is easy to absorb impurities and cause blockage, making it impossible to effectively complete sampling and ensure water quality detection. At the same time, it is inconvenient to control and adjust the sampling depth, and fixed-depth sampling cannot be guaranteed, making it difficult to obtain the results of water quality detection in waters of different depths. There are limitations in use. In view of this, a water quality detection sampler that avoids clogging with debris and can sample at a fixed depth is proposed to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to provide a water quality detection sampler that can avoid clogging by debris and can sample at a fixed depth, so as to solve the problem mentioned in the above background technology that the existing water quality detection sampler cannot avoid clogging by debris and can sample at a fixed depth.

[0005] To achieve the above object, the present invention provides the following technical solution: a water quality detection sampler that can avoid clogging by debris and can sample at a fixed depth, comprising a cantilever,

[0006] An electric telescopic rod, the electric telescopic rod is fixedly mounted on the top surface of the cantilever, and the output end of the electric telescopic rod slides through the cantilever;

[0007] A fixing cylinder, the fixing cylinder being fixedly mounted on the output end of the electric telescopic rod;

[0008] A sampling cylinder, the sampling cylinder is fixedly arranged to penetrate the bottom surface of the fixed cylinder;

[0009] A filter screen, the filter screen is fixedly installed through the bottom of the sampling tube;

[0010] A rotating mechanism, the rotating mechanism is arranged on the inner top surface of the fixed cylinder, and is used to remove foreign objects to prevent the filter from being blocked;

[0011] A reciprocating mechanism, the reciprocating mechanism is connected to the rotating mechanism, and the reciprocating mechanism is arranged on the inner bottom surface of the fixed cylinder;

[0012] An air jet mechanism, the air jet mechanism is connected to the reciprocating mechanism and is used to jet gas to the filter screen to clean the filter screen and avoid clogging;

[0013] The sampling mechanism is connected to the rotating mechanism and is used for sampling water.

[0014] The above technical solution can be used to avoid clogging by debris during sampling and can also be used for sampling at a fixed depth.

[0015] As a preferred technical solution of the present invention, the top end of the fixed tube is fixedly mounted vertically on a ruler, the ruler passes through the cantilever, and the ruler is slidably connected to the cantilever.

[0016] The above technical solution makes it easy to visually observe the sampling depth through a ruler.

[0017] As a preferred technical solution of the present invention, the rotating mechanism comprises:

[0018] A motor, the motor being fixedly mounted on the inner top surface of the fixed cylinder;

[0019] A driving gear, the driving gear is fixedly mounted on the shaft end of the motor;

[0020] A reciprocating screw rod, the top ends of the two symmetrically arranged reciprocating screw rods are connected to the inner top surface bearing of the fixed cylinder, and the reciprocating screw rods are arranged to penetrate the bottom surface of the fixed cylinder, and the reciprocating screw rods are connected to the bottom surface bearing of the fixed cylinder;

[0021] A driven gear, the driven gear is fixedly sleeved on the reciprocating screw rod, and the driven gear is meshed and connected with the driving gear;

[0022] A shift rod is fixedly mounted on the bottom end of the reciprocating screw rod.

[0023] By adopting the above technical solution, when the starting motor drives the driving gear to rotate, the reciprocating screw rod and the shifting rod are driven to rotate through the driven gear, so that the sundries are shifted away.

[0024] As a preferred technical solution of the present invention, the gear ratio between the driving gear and the driven gear is 4:1.

[0025] The above technical solution is adopted to facilitate the driven gear to rotate faster when the driving gear rotates.

[0026] As a preferred technical solution of the present invention, the reciprocating mechanism comprises:

[0027] Cylinders, two symmetrically arranged cylinders are fixedly mounted on the inner bottom surface of the fixed cylinder;

[0028] A slide rod, the slide rod is arranged through the top surface of the cylinder, and the slide rod is slidably connected with the top surface of the cylinder;

[0029] A connecting plate, wherein the connecting plate is fixedly mounted on the top end of the sliding rod, and the reciprocating screw rod passes through the connecting plate, and the reciprocating screw rod is threadedly connected to the connecting plate;

[0030] A piston plate is fixedly mounted on the bottom end of the slide rod, and the piston plate is consistent with the interior of the cylinder.

[0031] By adopting the above technical solution, when the reciprocating screw is rotated, the connecting plate drives the sliding rod and the piston plate to reciprocate.

[0032] As a preferred technical solution of the present invention, the jet mechanism comprises:

[0033] An air intake pipe, the bottom end of which is fixedly connected to the lower end of the outer wall of the cylinder, and the air intake pipe is fixedly connected to the top surface of the fixed cylinder, and the air intake pipe is slidably connected to the cantilever;

[0034] An air outlet pipe, one end of which is fixedly arranged to pass through the lower end of the inner wall of the cylinder body, and the air outlet pipe is fixedly arranged to pass through the side wall of the sampling cylinder;

[0035] An air jet nozzle is installed at the other end of the air outlet pipe and is located above the filter screen.

[0036] By adopting the above technical solution, the external gas can be sucked in and ejected through the air nozzle when the piston reciprocates, thereby achieving jet cleaning of the filter screen.

[0037] As a preferred technical solution of the present invention, a one-way air inlet valve is provided at the connection between the air inlet pipe and the cylinder, and an outward air inlet valve is provided at the connection between the air outlet pipe and the cylinder.

[0038] The above technical solution facilitates gas to be effectively taken in through the air inlet pipe and discharged through the air outlet pipe, thereby avoiding gas backflow.

[0039] As a preferred technical solution of the present invention, the sampling mechanism comprises:

[0040] A threaded rod, the top end of which is fixedly connected to the bottom surface of the driving gear, and the threaded rod is arranged to penetrate the top surface of the sampling barrel, and the threaded rod is connected to the top surface bearing of the sampling barrel;

[0041] A movable plate, wherein the movable plate is slidably connected to the inner wall surface of the sampling tube, and the threaded rod is arranged through the movable plate, and the threaded rod is threadedly connected to the movable plate;

[0042] Straight rods, two symmetrically arranged straight rods are fixedly and vertically mounted on the bottom surface of the movable plate;

[0043] A first limiting plate, wherein the first limiting plate is fixedly mounted on the bottom end of the straight rod;

[0044] A second limiting plate, wherein the second limiting plate is fixedly sleeved on the straight rod;

[0045] A bearing plate, wherein the bearing plate is slidably connected to the inner wall surface of the sampling tube, and the straight rod is arranged through the bearing plate, and the straight rod is slidably connected to the bearing plate, and the bearing plate is located between the first limiting plate and the second limiting plate;

[0046] A mounting rod, the mounting rod being fixedly mounted on the bottom end of the bearing plate;

[0047] A piston block is fixedly mounted on the bottom end of the mounting rod, and the piston block is consistent with the inner wall surface of the sampling cylinder.

[0048] The above technical solution is adopted to facilitate sampling through the movement of the piston block.

[0049] Compared with the prior art, the beneficial effects of the present invention are as follows: the water quality detection sampler that avoids clogging by debris and can sample at a fixed depth can avoid clogging by debris when sampling water, ensure stable and effective sampling, and ensure the implementation of water quality detection work. At the same time, it can facilitate fixed-depth sampling, realize sampling of waters at different depths, and ensure the diversity and accuracy of water quality detection data;

[0050] By starting the electric telescopic rod, the fixed tube and the sampling tube are moved downward, and the fixed tube drives the ruler to move synchronously, so that the sampling depth can be controlled by the ruler, so that fixed depth sampling can be performed;

[0051] By starting the motor to drive the driving gear to rotate, the driven gear drives the reciprocating screw and the lever to rotate, so that the debris in the water can be pushed to the lever to avoid clogging the filter screen during sampling;

[0052] The reciprocating screw rotates to make the connecting plate drive the slide rod and the piston plate to reciprocate, so that the external gas is sucked in through the air inlet pipe and then discharged through the air outlet pipe and sprayed to the filter by the right air nozzle, so that the filter is cleaned and blockage is further effectively avoided;

[0053] The active gear rotates to drive the threaded rod to rotate, so that the moving plate drives the straight rod to move downward. After the debris is cleaned, the active gear drives the threaded rod to rotate in the opposite direction through the motor, so that the moving plate drives the straight rod to reset upward. After the first limit plate contacts the bearing plate, it drives the bearing plate, the mounting rod and the piston block to move upward, so that water is sucked into the sampling tube to achieve sampling.

[0054] After the sampling is completed, the motor is started again to make the driving gear drive the threaded rod to rotate forward, so that the movable plate drives the straight rod to move downward. When the second limit plate contacts the supporting plate, the supporting plate, the mounting rod and the piston block will move downward to push the sampled water out until the piston block moves downward to the initial position. Then, the motor is used to rotate the driving gear and the threaded rod in the opposite direction again, so that the movable plate drives the straight rod to move upward to the initial position for subsequent use. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0056] Figure 2 It is a schematic diagram of the partial structure of the main cross-section of the present invention;

[0057] Figure 3 For the present invention Figure 2 The enlarged structural diagram at A in the middle;

[0058] Figure 4 This is a schematic diagram of the three-dimensional connection structure between the slide bar and the connection plate of the present invention;

[0059] Figure 5 It is a schematic diagram of the cross-sectional structure of the cylinder body of the present invention from top view;

[0060] Figure 6 This is a schematic diagram of the three-dimensional connection structure between the movable plate and the straight rod of the present invention;

[0061] Figure 7 This is a schematic diagram of the front cross-sectional structure of the sampling tube after sampling of the present invention.

[0062] In the figure: 1. cantilever; 2. electric telescopic rod; 3. fixed cylinder; 4. sampling cylinder; 5. filter screen; 6. ruler; 7. motor; 8. driving gear; 9. reciprocating screw; 10. driven gear; 11. lever; 12. cylinder; 13. sliding rod; 14. connecting plate; 15. piston plate; 16. air inlet pipe; 17. air outlet pipe; 18. air nozzle; 19. threaded rod; 20. moving plate; 21. straight rod; 22. first limit plate; 23. second limit plate; 24. bearing plate; 25. mounting rod; 26. piston block. DETAILED DESCRIPTION

[0063] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0064] See also Figure 1-7The technical solution of the present invention is: a water quality detection sampler that avoids clogging by debris and can sample at a fixed depth, comprising a cantilever 1, an electric telescopic rod 2 fixedly installed on the top surface of the cantilever 1, and the output end of the electric telescopic rod 2 slides through the cantilever 1, a fixed cylinder 3 fixedly installed on the output end of the electric telescopic rod 2, a sampling cylinder 4 fixedly penetrates the bottom surface of the fixed cylinder 3, and a filter 5 fixedly penetrates the bottom of the sampling cylinder 4;

[0065] The top of the fixed tube 3 is fixedly and vertically mounted on the scale 6, the scale 6 is arranged through the cantilever 1, and the scale 6 is slidably connected to the cantilever 1;

[0066] The motor 7 is fixedly mounted on the inner top surface of the fixed cylinder 3, the driving gear 8 is fixedly mounted on the shaft end of the motor 7, the top ends of the two symmetrically arranged reciprocating screw rods 9 are connected to the inner top surface bearing of the fixed cylinder 3, and the reciprocating screw rods 9 are arranged to penetrate the bottom surface of the fixed cylinder 3, and the reciprocating screw rods 9 are connected to the bottom surface bearing of the fixed cylinder 3, the driven gear 10 is fixedly sleeved on the reciprocating screw rods 9, and the driven gear 10 is meshed and connected with the driving gear 8, the shifting rod 11 is fixedly mounted on the bottom end of the reciprocating screw rods 9, and the gear ratio of the driving gear 8 to the driven gear 10 is 4:1;

[0067] Two symmetrically arranged cylinders 12 are fixedly installed on the inner bottom surface of the fixed cylinder 3, a slide rod 13 is arranged through the top surface of the cylinder 12, and the slide rod 13 is slidably connected to the top surface of the cylinder 12, a connecting plate 14 is fixedly installed on the top of the slide rod 13, and a reciprocating screw rod 9 is arranged through the connecting plate 14, and the reciprocating screw rod 9 is threadedly connected to the connecting plate 14, a piston plate 15 is fixedly installed on the bottom end of the slide rod 13, and the piston plate 15 is consistent with the inside of the cylinder 12;

[0068] The bottom end of the air inlet pipe 16 is fixedly set through the lower end of the outer wall of the cylinder 12, and the air inlet pipe 16 is fixedly set through the top surface of the fixed cylinder 3, and the air inlet pipe 16 is slidably set through the cantilever 1, one end of the air outlet pipe 17 is fixedly set through the lower end of the inner wall of the cylinder 12, and the air outlet pipe 17 is fixedly set through the side wall of the sampling cylinder 4, the air nozzle 18 is installed at the other end of the air outlet pipe 17, and the air nozzle 18 is located above the filter 5, a one-way air inlet valve is set at the connection between the air inlet pipe 16 and the cylinder 12, and an outward air inlet valve is set at the connection between the air outlet pipe 17 and the cylinder 12;

[0069] The top of the threaded rod 19 is fixedly connected to the bottom surface of the driving gear 8, and the threaded rod 19 is arranged through the top surface of the sampling tube 4, and the threaded rod 19 is connected to the top surface bearing of the sampling tube 4, the moving plate 20 is slidably connected to the inner wall surface of the sampling tube 4, and the threaded rod 19 is arranged through the moving plate 20, and the threaded rod 19 is threadedly connected to the moving plate 20, two symmetrically arranged straight rods 21 are fixedly and vertically installed on the bottom surface of the moving plate 20, and the first limit plate 22 is fixedly installed on the straight rod 21 The second limiting plate 23 is fixedly mounted on the straight rod 21, the bearing plate 24 is slidably connected to the inner wall surface of the sampling tube 4, and the straight rod 21 penetrates the bearing plate 24, and the straight rod 21 is slidably connected to the bearing plate 24, and the bearing plate 24 is located between the first limiting plate 22 and the second limiting plate 23, the mounting rod 25 is fixedly mounted on the bottom end of the bearing plate 24, the piston block 26 is fixedly mounted on the bottom end of the mounting rod 25, and the piston block 26 is consistent with the inner wall surface of the sampling tube 4.

[0070] Working principle: When in use, the cantilever 1 can be placed on the water surface first, and the fixed tube 3 and the sampling tube 4 can be moved downward by starting the electric telescopic rod 2. The downward movement of the fixed tube 3 drives the scale 6 to move downward synchronously, so that the sampling depth can be determined by observing the scale 6;

[0071] Then, the motor 7 is started to rotate the driving gear 8, so that the driven gear 10 meshing with the driving gear 8 drives the reciprocating screw 9 and the lever 11 to rotate, so that the debris in the water is moved away from the filter 5, so as to avoid the debris clogging the filter 5 during sampling;

[0072] When the reciprocating screw 9 rotates, the connecting plate 14 drives the slide bar 13 and the piston plate 15 to reciprocate, so that when the piston plate 15 moves upward, the external gas is sucked into the cylinder 12 through the air inlet pipe 16, and when the piston plate 15 moves downward, the gas is discharged through the air outlet pipe 17 and then sprayed toward the filter 5 by the air nozzle 18, so as to blow and clean the debris adhering to the filter 5, thereby ensuring the permeability of the filter 5;

[0073] During this process, the driving gear 8 drives the threaded rod 19 to rotate, so that the moving plate 20 threadedly connected to the threaded rod 19 drives the straight rod 21 to move downward. The first limiting plate 22 and the second limiting plate 23 move downward synchronously until the moving plate 20 moves downward to the lowest position;

[0074] Then, the driving gear 8 drives the threaded rod 19 to rotate in the opposite direction through the motor 7. At this time, the moving plate 20 drives the straight rod 21 and the first limiting plate 22 and the second limiting plate 23 to move upward. When the top surface of the first limiting plate 22 contacts the bottom surface of the carrying plate 24, the first limiting plate 22 drives the carrying plate 24 to move upward, so that the mounting rod 25 drives the piston block 26 to move upward synchronously, so that water can be sucked into the sampling tube 4 after passing through the filter screen 5. At the same time, when the lever 11 rotates and the filter screen 5 is jetted to clean, blockage during sampling is avoided, thereby ensuring stable and effective sampling.

[0075] After sampling is completed, the device is moved to the shore, and the driving gear 8 drives the threaded rod 19 to rotate through the motor 7. At this time, the moving plate 20 drives the straight rod 21 and the first limiting plate 22 and the second limiting plate 23 to move downward. When the bottom surface of the second limiting plate 23 conflicts with the top surface of the carrying plate 24, the second limiting plate 23 will drive the carrying plate 24 to move downward, so that the mounting rod 25 drives the piston block 26 to move downward synchronously, thereby pushing out the sampled water until the carrying plate 24 drives the mounting rod 25 and the piston block 26 to move downward to the initial position, and then the driving gear 8 drives the threaded rod 19 to rotate in the opposite direction through the motor 7 again, so that the moving plate 20 drives the straight rod 21 and the first limiting plate 22 and the second limiting plate 23 to move upward to the initial position. , so that it can be used next time, the contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0076] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A water quality detection sampler that avoids clogging by debris and can sample at a fixed depth, comprising a cantilever (1), characterized in that: Also includes: An electric telescopic rod (2), the electric telescopic rod (2) being fixedly mounted on the top surface of the cantilever (1), and an output end of the electric telescopic rod (2) being slidably disposed through the cantilever (1); A fixed cylinder (3), the fixed cylinder (3) being fixedly mounted on the output end of the electric telescopic rod (2); A sampling cylinder (4), the sampling cylinder (4) being fixedly arranged to penetrate the bottom surface of the fixed cylinder (3); A filter screen (5), the filter screen (5) being fixedly installed through the bottom of the sampling tube (4); A rotating mechanism, the rotating mechanism being arranged on the inner top surface of the fixed cylinder (3) and being used to remove foreign objects to prevent the filter screen (5) from being blocked; A reciprocating mechanism, the reciprocating mechanism being connected to the rotating mechanism and being arranged on the inner bottom surface of the fixed cylinder (3); An air jet mechanism, the air jet mechanism being connected to the reciprocating mechanism and being used for jetting gas to the filter screen (5) to clean the filter screen (5) and avoid clogging; A sampling mechanism, which is connected to the rotating mechanism and is used to sample water; The rotating mechanism comprises: A motor (7), the motor (7) being fixedly mounted on the inner top surface of the fixed cylinder (3); A driving gear (8), the driving gear (8) being fixedly mounted on the shaft end of the motor (7); A reciprocating screw rod (9), the top ends of two symmetrically arranged reciprocating screw rods (9) are connected to the inner top surface bearing of the fixed cylinder (3), and the reciprocating screw rod (9) is arranged to penetrate the bottom surface of the fixed cylinder (3), and the reciprocating screw rod (9) is connected to the bottom surface bearing of the fixed cylinder (3); A driven gear (10), the driven gear (10) being fixedly sleeved on the reciprocating screw rod (9), and the driven gear (10) being meshingly connected with the driving gear (8); A shifting rod (11), the shifting rod (11) being fixedly mounted on the bottom end of the reciprocating screw rod (9); The sampling mechanism comprises: a threaded rod (19), the top end of the threaded rod (19) being fixedly connected to the bottom surface of the driving gear (8), the threaded rod (19) being arranged to penetrate the top surface of the sampling barrel (4), and the threaded rod (19) being connected to a bearing on the top surface of the sampling barrel (4); A movable plate (20), the movable plate (20) being slidably connected to the inner wall surface of the sampling tube (4), the threaded rod (19) penetrating the movable plate (20), and the threaded rod (19) being threadedly connected to the movable plate (20); Straight rods (21), two symmetrically arranged straight rods (21) are fixedly mounted vertically on the bottom surface of the movable plate (20); A first limiting plate (22), the first limiting plate (22) being fixedly mounted on the bottom end of the straight rod (21); A second limiting plate (23), the second limiting plate (23) being fixedly sleeved on the straight rod (21); A bearing plate (24), the bearing plate (24) being slidably connected to the inner wall surface of the sampling tube (4), the straight rod (21) penetrating the bearing plate (24), the straight rod (21) being slidably connected to the bearing plate (24), and the bearing plate (24) being located between the first limiting plate (22) and the second limiting plate (23); A mounting rod (25), the mounting rod (25) being fixedly mounted on the bottom end of the bearing plate (24); A piston block (26), wherein the piston block (26) is fixedly mounted on the bottom end of the mounting rod (25), and the piston block (26) is matched with the inner wall surface of the sampling cylinder (4); The reciprocating mechanism comprises: Cylinders (12), two symmetrically arranged cylinders (12) being fixedly mounted on the inner bottom surface of the fixed cylinder (3); A sliding rod (13), the sliding rod (13) being arranged to penetrate the top surface of the cylinder (12), and the sliding rod (13) being slidably connected to the top surface of the cylinder (12); A connecting plate (14), wherein the connecting plate (14) is fixedly mounted on the top end of the sliding rod (13), and the reciprocating screw rod (9) is arranged to penetrate the connecting plate (14), and the reciprocating screw rod (9) is threadedly connected to the connecting plate (14); A piston plate (15), wherein the piston plate (15) is fixedly mounted on the bottom end of the slide rod (13), and the piston plate (15) is matched with the interior of the cylinder (12); The jet mechanism comprises: An air intake pipe (16), wherein the bottom end of the air intake pipe (16) is fixedly arranged to pass through the lower end of the outer wall of the cylinder (12), and the air intake pipe (16) is fixedly arranged to pass through the top surface of the fixed cylinder (3), and the air intake pipe (16) is slidably arranged to pass through the cantilever (1); An air outlet pipe (17), one end of the air outlet pipe (17) is fixedly arranged to pass through the lower end of the inner wall of the cylinder (12), and the air outlet pipe (17) is fixedly arranged to pass through the side wall of the sampling cylinder (4); An air nozzle (18), the air nozzle (18) being installed at the other end of the air outlet pipe (17), and the air nozzle (18) being located above the filter screen (5).

2. A water quality detection sampler that avoids clogging by debris and can sample at a fixed depth according to claim 1, characterized in that: The top end of the fixed cylinder (3) is fixedly mounted vertically on a scale (6), the scale (6) is arranged to penetrate the cantilever (1), and the scale (6) is slidably connected to the cantilever (1).

3. A water quality detection sampler that avoids clogging by debris and can sample at a fixed depth according to claim 1, characterized in that: The gear ratio between the driving gear (8) and the driven gear (10) is 4:

1.

4. A water quality detection sampler that can avoid clogging by debris and can sample at a fixed depth according to claim 1, characterized in that: A one-way air inlet valve is provided at the connection between the air inlet pipe (16) and the cylinder (12), and an outward air inlet valve is provided at the connection between the air outlet pipe (17) and the cylinder (12).

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