CN113957964A

CN113957964A - Intelligent single-body miniature conveying type vacuum excrement collector

Info

Publication number: CN113957964A
Application number: CN202111410398.2A
Authority: CN
Inventors: 黄青南
Original assignee: Ningbo Lide Automation Equipment Manufacturing Co ltd
Current assignee: Ningbo Lide Automation Equipment Manufacturing Co ltd
Priority date: 2021-11-25
Filing date: 2021-11-25
Publication date: 2022-01-21
Anticipated expiration: 2041-11-25
Also published as: CN113957964B

Abstract

The invention discloses intelligent single-body micro conveying type vacuum excrement collector equipment which comprises an excrement collector body, wherein the excrement collector body comprises a pressurization mechanism, a first water outlet pipe and an air conveying pipe, the first water outlet pipe and the air conveying pipe are respectively communicated with the pressurization mechanism, the first water outlet pipe is connected with the air conveying pipe, the tail end of the first water outlet pipe is connected with an excrement collecting cavity, the pressurization mechanism is connected with a toilet flushing water-saving mechanism, and the toilet flushing water-saving mechanism is communicated with the excrement collecting cavity. This excrement collector is through connecting towards lavatory water saving mechanism on booster mechanism, make the user after utilizing the water in booster mechanism to wash the chamber of collecting the excrement for the first time, can be when the urine or a little filth to the chamber of collecting the excrement for the second time wash, use the overflow to wash the better washing of the completion of little water among the water saving mechanism of lavatory to these urine or a little filth, the water that washes for the second time has replaced and has originally annotated a large amount of water in booster mechanism and wash, this waste of water resource that has significantly reduced, along with the increase of frequency of use, have very big influence to water-saving work.

Description

Intelligent single-body miniature conveying type vacuum excrement collector

Technical Field

The invention relates to the technical field of excrement collectors, in particular to intelligent single micro conveying type vacuum excrement collector equipment.

Background

The toilet is closely related to our life, and with the generation of different life and working modes, the application scenes of the toilet are more and more extensive. For example, a motor home has two functions of "house" and "car", and is also gradually a choice for more people. However, the narrow space of the motor home is required to be provided with equipment required by life, and the cleanness, energy conservation and convenience of the living equipment are the primary consideration. The excrement collector is living equipment which needs to be clean, energy-saving and convenient.

In addition, the vacuum excrement collector is also a technology integrating environmental protection, water saving, sewage collection, reclaimed water recycling and green fertilizer making systems. Compared with the traditional excrement collector, the novel toilet has the advantages of water saving, good flushing effect, good odor control, convenience in installation and the like. Such systems are used primarily in large pleasure boats, aircraft and fast trains. The vacuum excrement collector is also applied to houses, hotels and the like as a substitute of a flushing excrement collector.

The prior application number is CN202110537037.8, and the patent named as a vacuum excrement collector control system and device thereof discloses a technical scheme of an excrement collector: a vacuum excrement collector control system device comprises a program controller, wherein the program controller is connected with a master control system, the connecting end of the master control system is connected with an adjusting valve, a pressurization system, a vacuum generator and a blow-down valve, and the output end of the pressurization system is connected with a water-vapor mixed outflow device; the vacuum generator is connected with a storage tank, the storage tank is respectively provided with a sewage suction port and a sewage discharge port, the sewage discharge port is connected with a sewage discharge pipe, and the sewage discharge pipe is connected with a sewage discharge valve.

The water emulsion is sprayed out at high speed by the water-vapor mixing outflow device when the excrement collector runs, and the aim of effectively cleaning the excrement collecting cavity in the excrement collector can be achieved. However, it has some disadvantages, and it is necessary to refill the chamber with a large amount of water for flushing each time the chamber is flushed. This can play fine washing effect after the user carries out the excrement and urine washing, but sometimes the user only a little filth need wash in carrying out urine or collection chamber, reuse the water of filling and to the collection chamber wash can cause the waste of water resource to a certain extent, have very big influence to the use of water resource in the past this.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides the intelligent single micro-conveying type vacuum excrement collector equipment which is simple in structure and can reduce water resource waste.

In order to solve the technical problems, the invention solves the technical problems by the following technical scheme:

the utility model provides a miniature transport formula vacuum excrement collector equipment of intelligence monomer, includes the excrement collector body, the excrement collector body includes booster mechanism, first outlet pipe, gas-supply pipe, first outlet pipe and gas-supply pipe communicate with booster mechanism respectively, first outlet pipe is connected with the gas-supply pipe, the end-to-end connection excrement collecting cavity of first outlet pipe, booster mechanism is connected with the water conservation mechanism that washes the lavatory, the water conservation mechanism that washes the lavatory communicates to excrement collecting cavity. This miniature transport formula vacuum excrement collector equipment of intelligent monomer is through connecting towards lavatory water saving mechanism in the excrement collector body booster mechanism, make the user after the water that utilizes for the first time booster mechanism washes the chamber of defecating, can be when urine or a little filth to the chamber of defecating wash the second time, use overflow to the less water of towards in the lavatory water saving mechanism to these urine or a little filth completion better washing, the water that washes for the second time has replaced originally to annotate a large amount of water in booster mechanism and has washed, this waste of greatly reduced the water resource, along with the increase of use frequency, to water-saving work have very big influence.

Preferably, the toilet flushing water-saving mechanism comprises a first water storage pipe, a containing cavity, a second water outlet pipe and a pressure regulating mechanism, wherein the first water storage pipe is connected with the pressure regulating mechanism, a first electromagnetic valve is arranged at the joint of the first water storage pipe and the pressure regulating mechanism, the containing cavity is connected with the position between the first electromagnetic valve and the pressure regulating mechanism in the first water storage pipe, the pressure regulating mechanism is connected below the containing cavity and is communicated with the second water outlet pipe in a matched mode, the second water outlet pipe is provided with a second electromagnetic valve at the joint of the second water outlet pipe and the pressure regulating mechanism, and the second water outlet pipe is communicated to the excrement collecting cavity. The toilet flushing water-saving mechanism is reasonable in structure, the pressure regulating mechanism can be matched with high-pressure air in the first water storage pipe to enable water overflowing from the pressure regulating mechanism to always keep a stable flushing water pressure, and the flushing effect of the excrement collecting cavity is guaranteed.

Preferably, the pressure regulating mechanism comprises a second water storage pipe, a sealing plug, a fixing rod, a fixing cylinder and an elastic part, the second water storage pipe is connected below the containing cavity, the sealing plug slides on the inner side wall of the second water storage pipe along the length direction of the second water storage pipe, one end of the fixing rod is connected with the sealing plug, the other end of the fixing rod penetrates through the inner cavity of the fixing cylinder, and the fixing rod is connected with the elastic part in the fixing cylinder and moves along the length direction of the fixing cylinder. The pressure regulating mechanism is reasonable in structure, and the sealing plug can slide along the length direction of the fixed cylinder along with the pressure of water and high-pressure air through the connected fixed rod and the elastic piece.

Preferably, a disc matched with the inner side wall of the fixed cylinder is connected between the elastic part and the fixed rod, one end of the elastic part is connected with the disc, and the other end of the elastic part is connected to the bottom of the inner side of the fixed cylinder.

Preferably, the elastic member is a metal spring.

Preferably, the second outlet pipe communicates to the excrement collecting cavity, and the tip of its and excrement collecting cavity junction is the tubaeform setting, and the concrete structure that the second outlet pipe tip is the tubaeform setting is: the pipe diameter of one end of the excrement collecting cavity close to the excrement collecting cavity is smaller than that of one end of the excrement collecting cavity far away from the excrement collecting cavity. This arrangement can make the impact force (that is, water pressure) of the water that the second outlet pipe flows out bigger, has very effectual clearance effect to some more difficult dirty of washing in the excrement collecting cavity.

Preferably, the second water outlet pipe is communicated to the first water outlet pipe, and a third electromagnetic valve is arranged at the joint of the second water outlet pipe and the first water outlet pipe. The water pressure of the water from the second water outlet pipe and the first water outlet pipe to the excrement collecting cavity is common, and the water flushing device is suitable for flushing urine.

Preferably, booster mechanism is including last cavity, the cavity of resorption that is connected, go up cavity coupling gas-supply pipe, the first outlet pipe of cavity connection down.

Preferably, the toilet flushing water-saving mechanism is communicated with the lower cavity.

Preferably, a fourth electromagnetic valve and a fifth electromagnetic valve are arranged at the joint of the first water outlet pipe and the lower cavity in a matched manner, the fourth electromagnetic valve is arranged at one side of the first water outlet pipe close to the water inlet, the fifth electromagnetic valve is arranged at one side of the first water outlet pipe close to the excrement collecting cavity, the joint of the first water outlet pipe and the lower cavity is located between the fourth electromagnetic valve and the fifth electromagnetic valve, and the gas conveying pipe is communicated to the position of the first water outlet pipe between the fourth electromagnetic valve and the fifth electromagnetic valve.

Compared with the prior art, the invention has the beneficial effects that:

this miniature transport formula vacuum excrement collector equipment of intelligent monomer is through connecting towards lavatory water saving mechanism in the excrement collector body booster mechanism, make the user after the water that utilizes for the first time booster mechanism washes the chamber of defecating, can be when urine or a little filth to the chamber of defecating wash the second time, use overflow to the less water of towards in the lavatory water saving mechanism to these urine or a little filth completion better washing, the water that washes for the second time has replaced originally to annotate a large amount of water in booster mechanism and has washed, this waste of greatly reduced the water resource, along with the increase of use frequency, to water-saving work have very big influence.

Drawings

Fig. 1 is a schematic structural view of a toilet waste collector body according to the present invention.

Fig. 2 is a schematic structural diagram of the pressurization mechanism, the first water outlet pipe, the air delivery pipe and the control device in fig. 1.

Fig. 3 is a schematic structural view of the pressurization mechanism, the first water outlet pipe and the air delivery pipe in fig. 2.

Fig. 4 is a front view of the pressurization mechanism, the first water outlet pipe, the air delivery pipe and the control device in fig. 1.

Fig. 5 is a schematic structural view of the pressurization mechanism, the first water outlet pipe and the air delivery pipe in fig. 4.

Fig. 6 is a schematic sectional structure view of a second embodiment adopted by the water-saving mechanism for flushing toilet of the invention.

Fig. 7 is a schematic sectional structure view of a first embodiment adopted by the water-saving mechanism for flushing toilet of the invention.

FIG. 8 is a sectional structure diagram of a part of the structure of the water saving mechanism of the toilet.

Fig. 9 is an enlarged view of a portion a in fig. 8.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Specifically referring to fig. 1 to 9, an intelligent single-body miniature conveying type vacuum excrement collector device comprises an excrement collector body 1, wherein the excrement collector body 1 comprises a pressurization mechanism 11, a first water outlet pipe 12, a gas pipe 13 and an excrement collecting cavity 14, the pressurization mechanism 11 is used for storing water and high-pressure gas, the first water outlet pipe 12 and the gas pipe 13 are respectively communicated with the pressurization mechanism 11, the first water outlet pipe 12 is connected with the gas pipe 13, the tail end of the first water outlet pipe 12 is connected with the excrement collecting cavity 14, the pressurization mechanism 11 is connected with a toilet flushing water-saving mechanism 2, and the toilet flushing water-saving mechanism 2 is communicated to the excrement collecting cavity 14.

The toilet flushing water-saving mechanism 2 comprises a first water storage pipe 21, a containing cavity 22, a second water outlet pipe 23 and a pressure regulating mechanism 24, wherein the first water storage pipe 21 is connected with a lower cavity 112 of the pressurization mechanism 11, a first electromagnetic valve 25 is arranged at the joint of the first water storage pipe 21 and the lower cavity 112, the containing cavity 22 is connected with the position between the first electromagnetic valve 25 and the pressure regulating mechanism 24 in the first water storage pipe 21, more water can be stored in the containing cavity 22, the pressure regulating mechanism 24 is connected below the containing cavity 22 and is communicated with the second water outlet pipe 23 in a matched mode, a second electromagnetic valve 26 is arranged at the joint of the second water outlet pipe 23 and the pressure regulating mechanism 24, and the second water outlet pipe 23 is communicated to the excrement collecting cavity 14.

The pressure regulating mechanism 24 includes a second water storage pipe 241, a sealing plug 242, a fixing rod 243, a fixing cylinder 244 and an elastic member 245, the second water storage pipe 241 is connected below the cavity 22, the other end of the second water storage pipe 241 opposite to the cavity 22 is a closed structure, the sealing plug 242 slides on the inner side wall of the second water storage pipe 241 along the length direction of the second water storage pipe 241, the sealing plug 242 is made of rubber material, one end of the fixing rod 243 is connected with the sealing plug 242, the other end of the fixing rod 243 penetrates through the inner cavity of the fixing cylinder 244, and the fixing rod is connected with the elastic member 245 in the fixing cylinder 244 and moves along the length direction of the fixing cylinder 244. The fixed cylinder 244 is fixedly coupled to the inner bottom of the second reservoir pipe 241.

A disc 246 fitted to the inner side wall of the fixed cylinder 244 is connected between the elastic member 245 and the fixed rod 243, the disc 246 can slide on the inner side wall of the fixed cylinder 244 along the length direction of the fixed cylinder 244, one end of the elastic member 245 is connected to the disc 246, and the other end is connected to the inner bottom of the fixed cylinder 244.

The elastic member 245 is a metal spring.

The second water outlet pipe 23 has two embodiments:

in a first embodiment, as shown in fig. 7, the second water outlet pipe 23 is connected to the excrement collecting cavity 14, and the end of the connection part of the second water outlet pipe 23 and the excrement collecting cavity 14 is in a trumpet shape, and the specific structure of the trumpet-shaped end of the second water outlet pipe 23 is as follows: the pipe diameter of one end of the excrement collecting cavity 14 close to the excrement collecting cavity is smaller than that of one end of the excrement collecting cavity 14 far away from the excrement collecting cavity, the impact force (namely water pressure) of water flowing out of the second water outlet pipe 23 is larger due to the arrangement mode, and the excrement collecting cavity 14 has an effective cleaning effect on some dirt which is difficult to wash.

In the second embodiment, as shown in fig. 6, the second water outlet pipe 23 is connected to the first water outlet pipe 12, and a third electromagnetic valve 27 is disposed at the connection position of the two. Compared with the first embodiment, the water pressure from the second water outlet pipe 23, the first water outlet pipe 12 to the excrement collecting cavity 14 is relatively common, and the water is suitable for flushing urine.

The pressurizing mechanism 11 comprises an upper cavity 111 and a lower cavity 112 which are connected, wherein the lower cavity 112 stores water, the upper cavity 111 stores high-pressure air, the upper cavity 111 is connected with the air pipe 13, and the lower cavity 112 is connected with the first water outlet pipe 12.

The toilet flushing water-saving mechanism 2 is communicated with the lower cavity 112.

A fourth electromagnetic valve 15 and a fifth electromagnetic valve 16 are arranged at the joint of the first water outlet pipe 12 and the lower cavity 112 in a matching manner, the fourth electromagnetic valve 15 is arranged at one side of the first water outlet pipe 12 close to the water inlet, the left side of the first water outlet pipe 12 in fig. 5 is the water inlet, the other end opposite to the water inlet is communicated with the excrement collecting cavity 14, the fifth electromagnetic valve 16 is arranged at one side of the first water outlet pipe 12 close to the excrement collecting cavity 14, the joint of the first water outlet pipe 12 and the lower cavity 112 is located between the fourth electromagnetic valve 15 and the fifth electromagnetic valve 16, and the gas pipe 13 is communicated with the position between the fourth electromagnetic valve 15 and the fifth electromagnetic valve 16 in the first water outlet pipe 12.

The gas pipe 13 is communicated with the upper cavity 111 through a three-way joint, the three-way joint is connected to the top of the upper cavity 111, and the gas pipe 13 is connected to a position between the fourth electromagnetic valve 15 and the fifth electromagnetic valve 16 in the first water outlet pipe 12 after being connected out from one end of the three-way joint.

The first solenoid valve 25, the second solenoid valve 26, the third solenoid valve 27, the fourth solenoid valve 15 and the fifth solenoid valve 16 are all electrically connected with the control device.

In an initial state, water enters from the water inlet of the first water outlet pipe 12, the control device controls the fourth electromagnetic valve 15 and the first electromagnetic valve 25 to be opened, and controls the second electromagnetic valve 26 and the fifth electromagnetic valve 16 to be closed, at this time, the water gradually enters the lower cavity 112 from the first water outlet pipe 12, then the water in the lower cavity 112 overflows to the first water storage pipe 21 after being filled with the water, at this time, the water stops entering from the first water outlet pipe 12, and the fourth electromagnetic valve 15 is closed. After water enters from the first water storage pipe 21, the sealing plug 242 is lowered from the state of being above the inlet pipe opening of the second water outlet pipe 23 to the state of being level and level with the inlet pipe opening of the second water outlet pipe 23, because the sealing plug 242 extrudes the elastic element 245 through the connected fixing rod 243 and the disc 246 under the action of the gravity of the water.

Then the high pressure air enters the upper cavity 111 through the air pipe 13, and simultaneously the high pressure air in the upper cavity 111 enters the first water storage pipe 21, at this time, the sealing plug 242 is changed from the state of being horizontally flush with the inlet pipe orifice of the second water outlet pipe 23 to the state of being below the inlet pipe orifice of the second water outlet pipe 23 under the action of the air pressure. Then the first solenoid valve 25 is closed, the fifth solenoid valve 16 is opened, the water in the lower cavity 112 starts to flush from the first water outlet pipe 12 to the excrement collecting cavity 14 to flush the excrement collecting cavity 14, in the process, the high-pressure air assists the water to flush the excrement collecting cavity 14, and after the flushing is finished, the fifth solenoid valve 16 is closed, which is the first flushing process.

After the first flushing, when the user urinates for the second time or needs to simply clean some dirt in the excrement collecting cavity 14, as described above, in the first embodiment, the second electromagnetic valve 26 is opened, water in the first water storage pipe 21, the accommodating cavity 22 and the second water storage pipe 241 is flushed into the excrement collecting cavity 14 along the second water outlet pipe 23, in this case, the water pressure flushed from the excrement collecting cavity 14 is relatively high, the effect of flushing the dirt is obvious, in the process that the water flows from the second water storage pipe 241 to the second water outlet pipe 23, because the amount of the water in the first water storage pipe 21, the accommodating cavity 22 and the second water storage pipe 241 is gradually reduced, if the functions of the sealing plug 242, the fixing rod 243 and the elastic member 245 in the pressure regulating mechanism 24 are not provided, the water pressure for flushing the sealing plug will gradually decrease, and the sealing plug 242, the fixing rod 243 and the elastic member 245 in the pressure regulating mechanism 24 keep gradually moving upwards when the amount of the water decreases, the interaction of the sealing plug 242 and the high pressure air in the first reservoir 21 keeps the water pressure towards the second outlet pipe 23 stable and large enough to better flush the chamber 14.

In the second embodiment, the second electromagnetic valve 26 and the third electromagnetic valve 27 are opened, the water in the first water storage tube 21, the accommodating chamber 22 and the second water storage tube 241 is flushed into the feces collection chamber 14 along the second water outlet tube 23 and the first water outlet tube 12, in this case, the effect of flushing urine in the feces collection chamber 14 is also better, in the process that the water flows from the second water storage tube 241 to the second water outlet tube 23, because the amount of the water in the first water storage tube 21, the accommodating chamber 22 and the second water storage tube 241 is gradually reduced, if the sealing plug 242, the fixing rod 243 and the elastic member 245 in the pressure regulating mechanism 24 do not act, the water pressure of the water flushed out will be gradually reduced, and the sealing plug 242, the fixing rod 243 and the elastic member 245 in the pressure regulating mechanism 24 keep the sealing plug 242 gradually acting upwards when the amount of the water is reduced, the sealing plug 242 interacts with the high-pressure air in the first water storage tube 21, so that the water pressure flushed to the second water outlet tube 23 is kept stable and sufficiently large, flushing of the faecal collection chamber 14 is better performed.

The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.

Claims

1. The utility model provides a miniature transport formula vacuum excrement collector equipment of intelligence monomer, includes excrement collector body (1), excrement collector body (1) is including booster mechanism (11), first outlet pipe (12), gas-supply pipe (13), first outlet pipe (12) and gas-supply pipe (13) communicate with booster mechanism (11) respectively, first outlet pipe (12) are connected with gas-supply pipe (13), and the end-to-end connection excrement collecting cavity (14) of first outlet pipe (12), its characterized in that, booster mechanism (11) are connected with towards lavatory water conservation mechanism (2), it communicates to excrement collecting cavity (14) to towards lavatory water conservation mechanism (2).

2. An intelligent monomer micro-conveying type vacuum excrement collector device according to claim 1, wherein the flushing water-saving mechanism (2) comprises a first water storage pipe (21), a containing cavity (22), a second water outlet pipe (23) and a pressure regulating mechanism (24), the first water storage pipe (21) is connected with the pressure boosting mechanism (11), a first electromagnetic valve (25) is arranged at the joint of the first water storage pipe (21) and the pressure regulating mechanism (24), the containing cavity (22) is connected to the position between the first electromagnetic valve (25) and the pressure regulating mechanism (24) in the first water storage pipe (21), the pressure regulating mechanism (24) is connected below the containing cavity (22) and is matched with and communicated with the second water outlet pipe (23), a second electromagnetic valve (26) is arranged at the joint of the second water outlet pipe (23) and the pressure regulating mechanism (24), and the second water outlet pipe (23) is communicated with the excrement collecting cavity (14).

3. An intelligent single micro-delivery type vacuum toilet waste collector device according to claim 2, wherein the pressure regulating mechanism (24) comprises a second water storage pipe (241), a sealing plug (242), a fixing rod (243), a fixing cylinder (244) and an elastic member (245), the second water storage pipe (241) is connected below the cavity (22), the sealing plug (242) slides on the inner side wall of the second water storage pipe (241) along the length direction of the second water storage pipe (241), one end of the fixing rod (243) is connected with the sealing plug (242), the other end of the fixing rod (243) penetrates into the inner cavity of the fixing cylinder (244), and the fixing rod is connected with the elastic member (245) in the fixing cylinder (244) and acts along the length direction of the fixing cylinder (244).

4. An intelligent unit micro-conveying type vacuum excrement collector device according to claim 3, wherein a disk (246) matched with the inner side wall of the fixed cylinder (244) is connected between the elastic member (245) and the fixed rod (243), one end of the elastic member (245) is connected with the disk (246), and the other end of the elastic member is connected to the inner bottom of the fixed cylinder (244).

5. A smart monument micro-delivery vacuum waste collection device according to claim 4, wherein the elastic member (245) is a metal spring.

6. An intelligent single-body micro conveying type vacuum excrement collector device according to claim 4, wherein the second water outlet pipe (23) is communicated to the excrement collecting cavity (14), the end part of the joint of the second water outlet pipe and the excrement collecting cavity (14) is in a horn shape, and the specific structure of the horn shape of the end part of the second water outlet pipe (23) is as follows: the pipe diameter of one end of the excrement collecting cavity (14) is smaller than that of the other end of the excrement collecting cavity (14).

7. An intelligent single-body micro-conveying type vacuum excrement collector device according to claim 4, wherein the second water outlet pipe (23) is communicated to the first water outlet pipe (12), and a third electromagnetic valve (27) is arranged at the joint of the first water outlet pipe and the second water outlet pipe.

8. An intelligent single-body micro-conveying type vacuum excrement collector device according to claim 1, wherein the pressurization mechanism (11) comprises an upper cavity (111) and a lower cavity (112) which are connected, the upper cavity (111) is connected with the air conveying pipe (13), and the lower cavity (112) is connected with the first water outlet pipe (12).

9. An intelligent unitary micro-conveying vacuum toilet waste device according to claim 8, wherein the toilet water saving mechanism (2) is in communication with the lower cavity (112).

10. The intelligent monomer micro-conveying type vacuum excrement collector device according to claim 9, wherein a fourth electromagnetic valve (15) and a fifth electromagnetic valve (16) are arranged at a joint of the first water outlet pipe (12) and the lower cavity (112) in a matching manner, the fourth electromagnetic valve (15) is arranged at one side of the first water outlet pipe (12) close to the water inlet, the fifth electromagnetic valve (16) is arranged at one side of the first water outlet pipe (12) close to the excrement collecting cavity (14), the joint of the first water outlet pipe (12) and the lower cavity (112) is located between the fourth electromagnetic valve (15) and the fifth electromagnetic valve (16), and the air pipe (13) is communicated with a position of the first water outlet pipe (12) between the fourth electromagnetic valve (15) and the fifth electromagnetic valve (16).