CN112609639A

CN112609639A - Inflatable rubber dam

Info

Publication number: CN112609639A
Application number: CN202011491077.5A
Authority: CN
Inventors: 史成志; 赵娇娜; 邢玉美; 龙幸幸; 贾洋洋; 宋婷; 王文龙
Original assignee: Xingtai Xiangyu Water Conservancy Survey And Design Co ltd
Current assignee: Xingtai Xiangyu Water Conservancy Survey And Design Co ltd
Priority date: 2020-12-17
Filing date: 2020-12-17
Publication date: 2021-04-06
Anticipated expiration: 2040-12-17
Also published as: CN112609639B

Abstract

The application relates to an inflatable rubber dam, which belongs to the technical field of hydraulic engineering and comprises a foundation arranged in a river channel, a dam bag fixedly arranged on the foundation, a header pipe arranged on the foundation, a plurality of air pipes arranged on the header pipe, an inflation pump connected with the air pipes and used for inflating the interior of the dam bag, and an air pump used for pumping air in the dam bag; the air pipes are arranged on the header pipe at intervals, one ends, far away from the header pipe, of the air pipes are connected with the dam bags, and the dam bags are communicated with the header pipe through the air pipes. When the dam bag expands or contracts, gas enters the dam bag from the plurality of air pipes, and the gas in the dam bag uniformly enters or is discharged from the bottom of the dam bag, so that the top of the dam bag is uniformly subjected to the pressure of the gas and the pressure of water in the expansion or contraction process of the dam bag, and the stability and the service life of the rubber dam in the using process are improved.

Description

Inflatable rubber dam

Technical Field

The application relates to the field of hydraulic engineering, in particular to an inflatable rubber dam.

Background

The inflatable rubber dam is a bag type water retaining dam formed by anchoring dam bags in a river channel and inflating the dam bags, so that the dam bags are expanded, the dam top can overflow, the dam height can be adjusted by the inflation amount in the bags, and the upstream water level is controlled, so that the benefits of irrigation, power generation, shipping, flood control, moisture blocking and the like are achieved.

At present, the inflation or the exhaust in the dam bag is generally carried out at the positions of anchoring the dam bag at two ends of a river bank, so that the gas in the dam bag enters or is exhausted from the two ends of the dam bag.

Disclosure of Invention

In order to make the dam bag atress more even at the exhaust in-process that fills, this application provides an inflatable rubber dam.

The application provides an aerify rubber dam adopts following technical scheme:

an inflatable rubber dam comprises a foundation arranged in a river channel, a dam bag fixedly arranged on the foundation, a main pipe arranged on the foundation, a plurality of air pipes arranged on the main pipe, an inflation pump connected with the air pipes and used for inflating the dam bag, and an air pump used for pumping air in the dam bag; the air pipes are arranged on the header pipe at intervals, one ends, far away from the header pipe, of the air pipes are connected with the dam bags, and the dam bags are communicated with the header pipe through the air pipes.

By adopting the technical scheme, a foundation is built in a river channel, then the dam bag is installed on the butt joint, the dam bag is communicated with the plurality of air pipes, when the dam bag is inflated, the inflator pump is started, the air is flushed into the main pipe by the inflator pump, the air in the main pipe flows into the plurality of air pipes and enters the dam bag through the plurality of air pipes, and due to the fact that the number of the air pipes is large, and the air enters the dam bag from the bottom of the dam bag, a plurality of parts of the dam bag are inflated and expanded simultaneously, compared with the inflation at two ends, the air pressure on the top of the dam bag is uniform, the dam bag is expanded integrally, in the using process of the dam bag, the air pressure in the dam bag is more easily resisted with the water pressure, and the expanding speed of the dam bag in water is higher; similarly, when losing air, start the aspiration pump, take out the gas in the dam bag simultaneously from a plurality of trachea, make the high even decline of top surface of dam bag to make the dam bag aerify and carminative in-process, the pressure that wholly receives is comparatively even, improves the dam bag and fills the stability of exhaust in-process.

Optionally, the trachea is including setting firmly the parent tube on house steward, can dismantle the connecting tube of connection on the parent tube and establish the siphunculus of keeping away from parent tube one side at the connecting tube, the one end that the parent tube kept away from the parent tube has set firmly the ring flange, the pressure disk has set firmly on the connecting tube, the connecting pipe is located dam bag inside, the lateral wall clamp of dam bag is tight between ring flange and pressure disk, the length direction setting of dam bag is followed to the siphunculus, the siphunculus is in the equal opening in dam bag length direction's both ends.

Through adopting above-mentioned technical scheme, when installing the dam bag on the ground, the well fixed parent tube contact in advance on dam bag and the butt, then set up the hole on the lateral wall that the dam bag corresponds according to the position of parent tube, link together with the parent tube after passing the hole on the dam bag with the connecting pipe again, make pressure disk and flange plate press from both sides the lateral wall at dam bag hole border tightly together, because dam bag itself has great elasticity, consequently, the leakproofness after pressure disk and flange compress tightly the dam bag lateral wall is also better, make gaseous kneck from dam bag and tracheal of being difficult for revealing, it is more convenient also to make the connection between dam bag and the trachea.

Optionally, the height of the base pipe is higher than the height of the foundation surface.

By adopting the technical scheme, after the dam bag is fixed on the foundation, the dam bag can form a bulge at the position of the base pipe, so that a constructor can conveniently open holes on the dam bag according to the bulge position, and the convenience of construction is improved.

Optionally, the one end that the siphunculus was kept away from to the connecting pipe has set firmly the point portion that is coniform, set firmly a plurality of cutting edges on the conical surface of point portion, point portion and cutting edge are arranged in the base tube, the air vent has been seted up on the conical surface of point portion, the air vent is with base tube and connecting pipe intercommunication.

Through adopting above-mentioned technical scheme, when constructor installation connecting pipe, the opening part of parent tube is directly found according to the protruding position on the dam bag, then insert the dam bag with the point portion of connecting pipe, wear the dam bag at the opening part position of parent tube broken, and remove the in-process at point portion, a plurality of cutting edges on the point portion cut apart the dam bag lateral wall, make point portion and connecting pipe can be smooth insert in the parent tube, and be in the same place with the parent tube connection, when making connecting rod and parent tube connection, need not to carry out the work of dam bag trompil again, the efficiency of construction has further been improved.

Optionally, one side that the connecting pipe is located the parent tube inside has set firmly the clamping ring, the clamping ring sets up with parent tube inside wall interval, the position that the lateral wall of dam bag is located between ring flange and the pressure disk extends to in the parent tube to be extruded between clamping ring and parent tube.

By adopting the technical scheme, after the connecting pipe is inserted into the base pipe, the part of the dam bag cut by the cutting edge can be brought into the base pipe, the pressing ring is used for extruding the side wall of the dam bag into the base pipe, and when the dam bag is stressed, the pulling force applied to the hole of the dam bag is transmitted to the part in the base pipe, so that the hole of the dam bag is limited to be stretched and expanded, the sealing performance of the connection part of the dam bag and the air pipe is further improved, and the service life of the dam bag is prolonged.

Optionally, the go-between has set firmly in the inside of parent tube, point's cover is established in the go-between, the connecting pipe is equipped with threaded sleeve in the top cover of point portion, threaded sleeve threaded connection is in the go-between, the lateral wall that has the dam bag still extrudees between clamping ring bottom and the go-between top.

Through adopting above-mentioned technical scheme, after sharp portion and cutting edge passed the dam bag lateral wall completely, the threaded sleeve just in time contacted with the connecting ring, then rotated the connecting pipe, made the threaded sleeve screw in the connecting ring, realized the connection of connecting pipe and parent tube to threaded connection structural strength is higher, and the leakproofness is better.

Optionally, a plurality of tangent planes are arranged on the outer side wall of the connecting pipe above the pressure plate.

Through adopting above-mentioned technical scheme, the union makes the cooperation of siphunculus and connecting pipe more convenient, the constructor's of being convenient for construction, and the connection process of union can not exert an influence to siphunculus open-ended orientation, guarantees that the both ends opening of siphunculus can set up along the length direction of dam bag.

Optionally, the top surface of ring flange has set firmly the sealing ring, the seal groove has been seted up to the bottom surface of pressure disk, the sealing ring extrudees the lateral wall of dam bag in the seal groove.

By adopting the technical scheme, the side wall of the dam bag forms the bulge in the sealing groove under the action of the sealing ring and the sealing groove, so that the length of the side wall of the dam bag between the flange plate and the pressure plate is prolonged, and the connection strength and the sealing property of the side wall of the dam bag and the air pipe are improved.

Optionally, one end of the main pipe is provided with a three-way switching valve, and three openings of the three-way switching valve are respectively connected with the main pipe, the inflator pump and the air pump.

Through adopting above-mentioned technical scheme, when control the interior gas charging of dam bag or exhaust, will start the three-way diverter valve, control pump or aspiration pump and house steward intercommunication, guarantee unable intercommunication between pump and the aspiration pump, time pump and aspiration pump during operation are each other not influenced.

In summary, the present application includes at least one of the following beneficial technical effects:

1. when the dam bag is inflated or exhausted, gas enters and exits the dam bag from the plurality of gas pipes, so that the water pressure and the gas pressure of each part are uniform when the dam bag is expanded or contracted, and the stability of the dam bag in the inflation or exhaust process is ensured;

2. the connection between the air pipe and the dam bag is realized through the matching of the base pipe and the connecting pipe, the construction efficiency is high, the connection strength and the sealing performance of the side wall of the dam bag and the air pipe are good, and the fact that the position, connected with the air pipe, of the dam bag is not prone to expansion and stretching and air leakage when the dam bag expands is guaranteed.

Drawings

Fig. 1 is a schematic view showing a structure of a rubber dam in a river channel in an embodiment of the present application.

Fig. 2 is a partial sectional view showing an internal structure of the rubber dam.

Fig. 3 is a partial sectional view showing the structure of the trachea.

Fig. 4 is a partial exploded view showing a connection relationship of the base pipe, the connection pipe and the through pipe.

Fig. 5 is a partial view showing a structure of a connection pipe.

FIG. 6 is a partial view showing the position of the inflator and the pump.

Description of reference numerals: 1. a foundation; 2. dam bag; 3. a header pipe; 31. a three-way switching valve; 4. an air tube; 41. a base pipe; 411. a connecting ring; 42. a connecting pipe; 421. a tip portion; 4211. a vent hole; 422. a blade; 423. a threaded bushing; 424. pressing a ring; 43. pipe passing; 44. a flange plate; 441. a seal ring; 45. a platen; 451. a sealing groove; 46. a movable joint; 5. an inflator pump; 6. an air pump.

Detailed Description

The present application is described in further detail below with reference to figures 1-6.

The embodiment of the application discloses an inflatable rubber dam.

Referring to fig. 1 and 2, the inflatable rubber dam comprises a foundation 1 arranged in a river channel, a dam bag 2 installed on the foundation 1, a header pipe 3 arranged on the foundation 1, a plurality of air pipes 4 arranged on the header pipe 3, an inflator 5 connected with the air pipes 4 for inflating the dam bag 2, and an air pump 6 for pumping air in the dam bag 2. Foundation 1 provides the mounted position for dam bag 2, and house steward 3 sets up along dam bag 2's length direction, and a plurality of trachea 4 are along house steward 3's even interval distribution of length direction, and each trachea 4 all communicates with dam bag 2 is inside. The inflator pump 5 and the air pump 6 are both connected with the header pipe 3, when the inflator pump 5 inflates air into the header pipe 3, the air enters the plurality of air pipes 4 through the header pipe 3, and enters the interior of the dam bag 2 from the bottom of the dam bag 2 through the plurality of air pipes 4, so that the interior of the dam bag 2 is inflated and expanded; on the contrary, when the air pump 6 pumps the air in the header pipe 3, the air in the dam bag 2 enters the header pipe 3 through the plurality of air pipes 4, so that the dam bag 2 is deflated and contracted, and the control of the dam bag 2 on the water flow in the river channel is realized by controlling the expansion height of the top end of the dam bag 2.

Because the gas is uniformly fed or discharged from the plurality of gas pipes 4 at the bottom of the dam bag 2, compared with the gas fed or discharged from the two ends of the dam bag 2, the water pressure and the gas pressure applied to each part are uniform when the dam bag 2 is expanded or contracted, and the stability of the dam bag 2 in the process of inflation or exhaust is improved.

Referring to fig. 2, a foundation 1 is formed by pouring concrete, a foundation pit is excavated at a corresponding position in a river channel, a pouring template is built after a reinforcement cage is fixed in the foundation pit, and the concrete is poured on the reinforcement cage, so that the foundation 1 is formed in the river channel. The dam bag 2 is integrally anchored on the foundation 1, the bottom side wall of the dam bag 2 is completely attached to the surface of the foundation 1, and two ends of the dam bag 2 in the width direction of the river channel are respectively anchored with the two side bank protectors of the foundation 1, so that the dam bag 2 forms a hollow structure. The main pipe 3 is embedded in the foundation 1 in advance to reduce the whole installation space and not interfere the contact between the bottom of the dam bag 2 and the surface of the foundation 1.

Referring to fig. 3 and 4, the gas pipe 4 includes a base pipe 41 fixedly installed on the main pipe 3, a connection pipe 42 detachably connected to the base pipe 41, and a through pipe 43 provided on the connection pipe 42; the through pipe 43 is communicated with the header pipe 3 through the base pipe 41 and the connecting pipe 42, and the through pipe 43 is positioned in the dam bag 2 and communicated with the interior of the dam bag 2. Wherein the content of the first and second substances,

referring to fig. 3 and 4, the base pipe 41 is connected with the main pipe 3 by a tee joint, so that the base pipe 41 is communicated with the main pipe 3, the base pipe 41 is communicated with the main pipe 3 and embedded in the foundation 1 in advance, and the top end opening of the base pipe 41 leaks out of the surface of the foundation 1; the connecting pipe 42 is located inside the dam bag 2, the bottom end of the connecting pipe 42 is installed on the base pipe 41, the top end of the base pipe 41 is fixedly provided with a flange plate 44, the outer side wall of the connecting pipe 42 is sleeved with a pressure plate 45, and the flange plate 44 corresponds to the pressure plate 45.

Referring to fig. 3, dam bag 2 anchors on ground 1 back, dam bag 2 lateral wall can all laminate with parent tube 41 opening and flange 44, set up the hole on dam bag 2 according to the position of parent tube 41 this moment, make parent tube 41 and dam bag 2 inside intercommunication, then insert connecting pipe 42 in parent tube 41 rather than fixed together, pressure disk 45 offers the peripheral lateral wall extrusion of hole on flange 44 with dam bag 2 simultaneously, play the sealing effect through the elasticity of dam bag 2 self, guarantee that dam bag 2 and trachea 4's junction is difficult for appearing the phenomenon of losing air.

In addition, referring to fig. 3, the tops of the base pipe 41 and the flange 44 are higher than the surface of the foundation 1, so that after the dam bag 2 is fixed, the dam bag 2 forms a bulge at the position where the base pipe 41 is arranged under the action of tension, and a constructor can judge the position of the base pipe 41 according to the bulge formed on the dam bag 2.

Referring to fig. 3 and 4, a sealing ring 441 is fixedly arranged on the top surface of the flange plate 44, a sealing groove 451 is formed in the bottom surface of the pressure plate 45, when the flange plate 44 and the pressure plate 45 clamp the sidewall of the dam bag 2, the sidewall of the dam bag 2 is pressed into the sealing groove 451, the contact area between the sidewall of the dam bag 2 and the pressure plate 45 and the flange plate 44 is prolonged, the shape and the structure of the sidewall of the dam bag 2 between the pressure plate 45 and the flange plate 44 become more complex, the sealing degree of the joint of the two is further improved, and the height of the flange plate 44 is further increased by the sealing ring 441, so that the bulge formed on the sidewall of the dam bag 2 at the base pipe 41.

Referring to fig. 3 and 5, in order to facilitate the constructor to form a hole on the sidewall of the dam bag 2, a conical tip 421 is further fixedly disposed at the bottom of the connecting pipe 42, and a plurality of blades 422 are fixedly disposed on the conical surface of the tip 421, and the blades 422 are disposed along the axial direction of the connecting pipe 42. After finding the protruding position on dam bag 2, directly insert protruding centre of a circle position with point portion 421, point portion 421 punctures 2 lateral walls of dam bag and gets into in the parent tube 41 to in the removal process, a plurality of cutting edges 422 cut 2 lateral walls of dam bag, make point portion 421 and connecting pipe 42 can be smooth pass dam bag 2 get into the connecting pipe 42 in, constructor need not to reuse other instruments to cut dam bag 2, improves the efficiency of construction.

Referring to fig. 3 and 5, a plurality of vent holes 4211 are formed in the tip portion 421, and the plurality of vent holes 4211 are uniformly distributed along the circumferential direction of the tip portion 421, so that after the tip portion 421 is inserted into the base pipe 41, the plurality of vent holes 4211 communicate the inside of the base pipe 41 and the inside of the connecting pipe 42, and gas can enter the connecting pipe 42 from the base pipe 41.

Referring to fig. 3 and 4, a connection ring 411 is fixedly arranged on the inner side wall of the base pipe 41, the maximum diameter of the tip portion 421 and the outer diameter of the connection pipe 42 are both smaller than the inner diameter of the connection ring 411, a threaded sleeve 423 is further fixedly arranged on the outer side wall of the connection pipe 42, the threaded sleeve 423 is located above the tip portion 421, and the threaded sleeve 423 is sleeved in the connection ring 411 and is in threaded connection with the connection ring 411. After the tip portion 421 is inserted into the base pipe 41, the threaded sleeve 423 contacts the connecting pipe 42, and then the connecting pipe 42 is rotated to screw the threaded sleeve 423 into the connecting ring 411, so as to fix the connecting pipe 42 and the base pipe 41.

Referring to fig. 3 and 5, a pressing ring 424 is further sleeved on the outer side wall of the connecting pipe 42, and the outer diameter of the pressing ring 424 is smaller than the inner diameter of the base pipe 41 and larger than the inner diameter of the connecting ring 411. After the tip 421 enters the base pipe 41, the cut part of the dam bag 2 is carried into the base pipe 41 by friction, and after the threaded sleeve 423 is screwed into the connecting ring 411, the pressing ring 424 presses the sidewall of the dam bag 2 carried into the base pipe 41 against the inner sidewall of the base pipe 41, and part of the sidewall of the dam bag 2 is pressed between the pressing ring 424 and the connecting ring 411. In the expansion process of the dam bag 2, the part of the dam bag 2 provided with the holes can be subjected to the expanding tension, the part extruded in the base pipe 41 can resist the tension, so that the dam bag 2 cannot be separated from the base pipe 41 and the connecting pipe 42, the part of the dam bag 2 provided with the holes cannot be expanded, the connecting strength between the dam bag 2 and the air pipe 4 can be improved, and the sealing performance of the connecting part of the dam bag 2 and the air pipe 4 is further improved.

When the dam bag 2 is inflated and expanded, if the gas enters the dam bag 2 from the connecting pipe 42 and flows vertically upwards, a protrusion higher than other parts is formed above each through pipe 43 of the dam bag 2, otherwise, when the dam bag 2 is deflated, a recess lower than other parts is formed above each through pipe 43 of the dam bag 2, which may cause uneven pressure of water flow in the river channel on the whole dam bag 2. Therefore, referring to fig. 2 and 3, the axis of the through pipe 43 is parallel to the axis of the header pipe 3, that is, the through pipe 43 is also arranged along the length direction of the dam bag 2, and both ends of the through pipe 43 are open, the connecting pipe 42 is connected to the middle part of the through pipe 43 in the axial direction, so that after the gas enters the through pipe 43 from the connecting pipe 42, the gas enters or leaves the interior of the dam bag 2 from both ends of the through pipe 43, and thus, when the gas enters or leaves the interior of the dam bag 2, the gas flows along the length direction of the dam bag 2, thereby avoiding the above-mentioned problems.

Referring to fig. 3 and 4, a movable joint 46 is provided between the through pipe 43 and the top end of the connecting pipe 42, that is, the through pipe 43 and the connecting pipe 42 are detachably connected through the movable joint 46, the connection mode of the movable joint 46 is simple, and when the movable joint 46 is connected, the connection direction of the through pipe 43 is easily controlled.

Referring to fig. 1 and 5, one end of the main pipe 3 extends to one side of the river bank after penetrating through the foundation 1, and a three-way switching valve 31 is fixedly arranged, openings at the other two ends of the three-way switching valve 31, which are far away from the main pipe 3, are respectively connected with the inflator 5 and the air pump 6, and the communication between the inflator 5 and the air pump 6 and the main pipe 3 is changed through the three-way switching valve 31, that is, the inflator 5 and the air pump 6 are not communicated, so that the operation of the inflator 5 or the air pump 6 is not affected by each other.

The implementation principle of the inflatable rubber dam in the embodiment of the application is as follows: through set up a plurality of trachea 4 at dam bag 2 bottom, aerify or carminative in-process in to dam bag 2, it is inside that gaseous even gets into at dam bag 2 bottom to gaseous flow along dam bag 2's length direction under the effect of siphunculus 43, thereby make dam bag 2 at inflation or shrink in-process, the pressure that the dam bag 2 top received gaseous pressure and water is all comparatively even, improves the stability and the life of rubber dam in the use.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. An inflatable rubber dam, which is characterized in that: the dam comprises a foundation (1) arranged in a river channel, a dam bag (2) fixedly arranged on the foundation (1), a header pipe (3) arranged on the foundation (1), a plurality of air pipes (4) arranged on the header pipe (3), an air pump (5) connected with the air pipes (4) and used for inflating the dam bag (2), and an air pump (6) for pumping air in the dam bag (2);

the air pipes (4) are arranged on the header pipe (3) at intervals, one end, far away from the header pipe (3), of each air pipe (4) is connected with the dam bag (2), and the dam bag (2) is communicated with the header pipe (3) through the air pipes (4).

2. An inflatable rubber dam as defined in claim 1 wherein: trachea (4) including setting firmly base tube (41) on house steward (3), can dismantle connecting pipe (42) way and establish siphunculus (43) of keeping away from base tube (41) one side at connecting pipe (42) way on base tube (41), the one end that house steward (3) way was kept away from in base tube (41) has set firmly ring flange (44), pressure disk (45) have set firmly on connecting pipe (42) way, connecting pipe (42) are located dam bag (2) inside, the lateral wall clamp of dam bag (2) is tight between ring flange (44) and pressure disk (45), the length direction setting of dam bag (2) is followed in siphunculus (43), siphunculus (43) are in the equal opening in dam bag (2) length direction's both ends.

3. An inflatable rubber dam as defined in claim 2 wherein: the height of the base pipe (41) is higher than the surface height of the foundation (1).

4. An inflatable rubber dam as defined in claim 2 wherein: one end of the connecting pipe (42) far away from the through pipe (43) is fixedly provided with a conical tip portion (421), a plurality of cutting edges (422) are fixedly arranged on the conical surface of the tip portion (421), the tip portion (421) and the cutting edges (422) are arranged in the base pipe (41), the conical surface of the tip portion (421) is provided with a vent hole (4211), and the base pipe (41) is communicated with the connecting pipe (42) through the vent hole (4211).

5. An inflatable rubber dam as defined in claim 4 wherein: connecting pipe (42) are located inside one side of parent tube (41) and have set firmly clamping ring (424), clamping ring (424) and parent tube (41) inside wall interval set up, the position that the lateral wall of dam bag (2) is located between ring flange (44) and pressure disk (45) extends to in parent tube (41) to be squeezed between clamping ring (424) and parent tube (41).

6. An inflatable rubber dam as defined in claim 5 wherein: the inside of parent tube (41) has set firmly go-between (411), point (421) cover is established in go-between (411), connecting pipe (42) are equipped with threaded sleeve pipe (423) in the top cover of point (421), threaded sleeve pipe (423) threaded connection is in go-between (411), the lateral wall that has dam bag (2) still extrudees between clamping ring (424) bottom and go-between (411) top.

7. An inflatable rubber dam as defined in claim 2 wherein: a movable joint (46) is arranged between the connecting pipe (42) and the through pipe (43), and the movable joint (46) connects the connecting pipe (42) and the through pipe (43) together.

8. An inflatable rubber dam as defined in claim 2 wherein: the top surface of ring flange (44) sets firmly sealing ring (441), seal groove (451) have been seted up to the bottom surface of pressure disk (45), sealing ring (441) extrudees the lateral wall of dam bag (2) in seal groove (451).

9. An inflatable rubber dam as defined in claim 1 wherein: one end of the header pipe (3) is provided with a three-way switching valve (31), and three openings of the three-way switching valve (31) are respectively connected with the header pipe (3), the inflator pump (5) and the air pump (6).