Cleaning solution spray gun

Abstract

The utility model discloses a cleaning liquid spray gun, which belongs to the technical field of cleaning equipment and comprises a shell and a bottle body for storing cleaning liquid, a connector and a spray head are arranged on the shell, a steam channel is arranged in the connector, and a cleaning liquid channel is arranged in the spray head. The connector and the spray head are detachably connected in a matched mode, the steam channel is communicated with the cleaning liquid channel when the connector and the spray head are assembled, the bottle body is detachably arranged on the shell and is communicated with the cleaning liquid channel when the bottle body is assembled, an air spraying opening is formed in the end of the spray head, and an extension pipe is connected to the connector, is communicated with the steam channel and extends into the cleaning liquid channel. And a negative pressure mixing area is formed between the extension pipe and the air jet hole. According to the structure, steam is mixed with the cleaning liquid at the position close to the air spraying opening, the spraying path of the steam and the cleaning liquid after mixing can be reduced, meanwhile, the pressure difference between the negative pressure mixing area and the atmosphere is increased, the steam and the cleaning liquid can be fully mixed and sprayed out at a high speed, and practicability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of cleaning equipment, in particular to a cleaning liquid spray gun. Background Art

[0002] The utility model patent with Chinese application number CN202321075790.0 discloses a cleaning liquid spray bottle, which includes a positioning shell and a bottle body. The bottle body is detachably arranged on the positioning shell. A steam channel is provided through the positioning shell. A connecting seat connected to the injection port of the steam cleaning machine is provided on one side of the steam channel. The steam channel is provided with a large diameter portion, a middle diameter portion and a small diameter portion along the direction of steam flow. The large diameter portion is provided with a reduced diameter portion extending into the middle diameter portion. A vacuum chamber is formed between the reduced diameter portion and the middle diameter portion. A liquid suction channel is connected to the vacuum chamber. The liquid suction channel extends into the bottle body. A valve body for opening and closing the liquid suction channel is provided on the liquid suction channel. The cleaning liquid spray bottle described above can be connected to a steam cleaning machine. During the steam cleaning machine's steam spraying process, the cleaning liquid in the bottle is sucked into the liquid suction channel and sprayed out along with the steam from the steam channel. The cleaning liquid is heated during the spraying process, which can improve cleaning convenience and efficiency. However, a vacuum chamber is formed between the reduced diameter portion and the middle diameter portion. This vacuum chamber is far away from the steam and cleaning liquid spray nozzle, so the mixed liquid of steam and cleaning liquid needs to travel a long path before being sprayed out, resulting in a slow spraying speed and a small spraying range, which affects the user experience. Therefore, further improvement is necessary. Utility Model Content

[0003] The utility model aims to provide a cleaning liquid spray gun to overcome the deficiencies in the prior art.

[0004] A cleaning liquid spray gun designed for this purpose includes a shell and a bottle body for storing cleaning liquid, the shell is provided with a connecting head and a nozzle, the connecting head is provided with a steam channel, the nozzle is provided with a cleaning liquid channel, the connecting head and the nozzle are detachably connected, and the steam channel and the cleaning liquid channel are interconnected when the two are assembled, the bottle body is detachable from the shell and is interconnected with the cleaning liquid channel when assembled, an air jet is provided at the end of the nozzle, an extension tube is connected to the connecting head, the extension tube is interconnected with the steam channel, and extends in the cleaning liquid channel and close to the air jet, forming a negative pressure mixing area between the extension tube and the air jet.

[0005] The nozzle is provided with a bottle body connecting portion, and is detachably connected to the bottle body through the bottle body connecting portion. A one-way valve is provided between the steam channel and the bottle body connecting portion. One end of the one-way valve is communicated with the cleaning liquid channel, and the other end is connected to a switching connecting piece, and is connected to a connecting pipe extending into the bottle body through the switching connecting piece.

[0006] An air inlet is provided between the bottle body connecting portion and the nozzle, and the air inlet is communicated with the bottle body. A switch paddle is provided on the nozzle or the shell, and a switch through hole is provided on the switch paddle. The switch paddle is movably provided on the nozzle or the shell, and when it is active, it closes the air inlet or is communicated with the air inlet through the switch through hole.

[0007] The nozzle is provided with a neck toward the bottle body connecting portion, the bottle body connecting portion is connected to the nozzle through the neck, the air inlet is provided on the neck, a movable opening is provided on the shell, the movable opening corresponds to the air inlet, and the switch paddle is movably provided on the movable opening.

[0008] The switch paddle is provided with a positioning portion, and the nozzle or the housing is provided with a positioning matching portion, and the switch paddle is movably positioned on the positioning matching portion through the positioning portion.

[0009] The nozzle is further provided with an air jet channel, which is located at the front end of the cleaning liquid channel. The front end of the extension tube extends through the cleaning liquid channel and is located in the air jet channel, and forms the negative pressure mixing area between the extension tube and the air jet port.

[0010] The inner diameter of the jet channel is smaller than that of the cleaning liquid channel, and a diameter-reducing connecting portion is provided between the two channels. The two channels are connected to each other through the diameter-reducing connecting portion, and the inner diameter of the jet channel gradually decreases toward the jet port.

[0011] The extension tube includes a hose and a hard tube. The hose is located in the cleaning liquid channel, and its rear end is connected to the connector. The rear end of the hard tube is located in the cleaning liquid channel and is connected to the front end of the hose. The front end of the hard tube extends into the jet channel, and forms the negative pressure mixing area between the hard tube and the jet port.

[0012] The shell includes a first shell and a second shell, the first shell and the second shell are fixed to each other, and a shell inner cavity running through the first and second shells is formed therebetween, the connecting head is located in the shell inner cavity, the nozzle is at least partially located in the shell inner cavity, and is detachably connected to the connecting head, the remaining part of the nozzle is located outside the shell inner cavity, and a nozzle seal is provided on it, and a cleaning accessory is sealed and disassembled through the nozzle seal, the bottom of the shell inner cavity is also provided with an inner cavity bottom opening, a bottle body connecting part is provided on the nozzle, the bottle body connecting part is located outside the inner cavity bottom opening, and a bottle body seal is provided between the bottle body and the bottle body, and the bottle body is detachably and sealedly connected to the bottle body connecting part through the bottle body seal.

[0013] A connecting seat is provided at the rear end of the first shell and the second shell, and a steam cleaning machine is disassembled and assembled through the connecting seat. When the steam cleaning machine is assembled, the injection port is connected to the rear end of the steam channel. A connecting head seal is provided on the connecting head, and the connecting head seal is sealed and assembled in the cleaning liquid channel to achieve mutual sealed communication between the front end of the steam channel and the rear end of the cleaning liquid channel.

[0014] The cleaning liquid spray gun of the present invention can be connected to a steam cleaning machine. When the steam cleaning machine is working, the steam sprayed out can enter the steam channel, and the cleaning liquid stored in the bottle can enter the cleaning liquid channel. The steam channel and the cleaning liquid channel are interconnected, so that the cleaning liquid can be sprayed out together with the steam through the air jet. In addition, since the extension tube extends in the cleaning liquid channel and is close to the air jet, a negative pressure mixing area is formed between the extension tube and the air jet. Therefore, the steam will mix with the cleaning liquid in the negative pressure mixing area (that is, the position close to the air jet), which can not only heat the cleaning liquid and improve the decontamination and cleaning ability, but also reduce the spraying path of the steam and cleaning liquid after mixing, and at the same time increase the pressure difference between the negative pressure mixing area and the atmosphere, so that the steam and the cleaning liquid can be fully mixed and sprayed at high speed, thereby effectively improving the spraying speed and spraying range of the mixed liquid of steam and cleaning liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the assembly structure of an embodiment of the present utility model.

[0016] Figure 2 This is a schematic diagram of the exploded structure of an embodiment of the present invention.

[0017] Figure 3 This is a schematic diagram of the exploded structure of an embodiment of the present invention from another perspective.

[0018] Figure 4 This is a schematic diagram of the assembly cross-sectional structure of an embodiment of the present utility model.

[0019] Figure 5 This is a schematic diagram of the assembly structure of an embodiment of the present invention after omitting the bottle body, the connecting pipe and the second shell.

[0020] Figure 6 for Figure 5 A in the figure is an enlarged structural diagram.

[0021] Figure 7 This is a schematic diagram of the assembly structure of the cleaning liquid spray gun and steam cleaning machine. DETAILED DESCRIPTION

[0022] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of specific embodiments of the present invention is provided in conjunction with the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] See also Figure 1-Figure 7 The cleaning liquid spray gun includes a shell and a bottle body 1 for storing cleaning liquid. The shell is provided with a connecting head 2 and a nozzle 3. The connecting head 2 is provided with a steam channel 2.1, and the nozzle head 3 is provided with a cleaning liquid channel 3.1. The connecting head 2 and the nozzle head 3 are detachably connected, and when the two are assembled, the steam channel 2.1 and the cleaning liquid channel 3.1 are communicated with each other. The bottle body 1 is disassembled from the shell and is communicated with the cleaning liquid channel 3.1 when assembled. An air jet 3.2 is provided at the end of the nozzle head 3. The connecting head 2 is connected to an extension tube, which is communicated with the steam channel 2.1 and extends in the cleaning liquid channel 3.1 and is close to the air jet 3.2. A negative pressure mixing area is formed between the extension tube and the air jet 3.2.

[0025] The cleaning liquid spray gun of this embodiment can be connected to a steam cleaning machine 17. When the steam cleaning machine 17 is working, the steam sprayed by the steam cleaning machine 17 can enter the steam channel 2.1. The cleaning liquid stored in the bottle body 1 can enter the cleaning liquid channel 3.1. The steam channel 2.1 and the cleaning liquid channel 3.1 are connected to each other, so that the cleaning liquid can be sprayed out together with the steam through the air jet 3.2. In addition, since the extension tube extends in the cleaning liquid channel 3.1 and is close to the air jet 3.2, a negative pressure mixing area is formed between the extension tube and the air jet 3.2. Therefore, the steam will mix with the cleaning liquid in the negative pressure mixing area (i.e., the position close to the air jet 3.2). This not only heats the cleaning liquid and improves the decontamination and cleaning ability, but also reduces the spraying path of the steam and cleaning liquid after mixing. At the same time, it can also increase the pressure difference between the negative pressure mixing area and the atmosphere, so that the steam and cleaning liquid can be fully mixed and sprayed out at a high speed, thereby effectively improving the spraying speed and spraying range of the mixed liquid of steam and cleaning liquid.

[0026] The nozzle 3 is provided with a bottle body connecting portion 3.3, and is detachably connected to the bottle body 1 through the bottle body connecting portion 3.3. A one-way valve 4 is provided between the steam channel 2.1 and the bottle body connecting portion 3.3. One end of the one-way valve 4 is connected to the cleaning liquid channel 3.1, and the other end is connected to the adapter connecting piece 5, and is connected to the connecting pipe 6 extending into the bottle body 1 through the adapter connecting piece 5.

[0027] In this embodiment, the bottle connecting portion 3.3 is provided with an internal thread, and the bottle body 1 is provided with an external thread. The bottle connecting portion 3.3 and the bottle body 1 are detachably matched by the cooperation of the internal and external threads. In addition, the connecting pipe 6 and the one-way valve 4 are connected by the adapter connecting piece 5. At the same time, the one-way guide function of the one-way valve 4 is utilized, so that the cleaning liquid in the bottle body 1 can only enter the cleaning liquid channel 3.1 through the connecting pipe 6, the adapter connecting piece 5, and the one-way valve 4, and the cleaning liquid and steam cannot flow back into the bottle body 1, thereby effectively ensuring the concentration of the cleaning liquid in the bottle body 1 and preventing the high temperature of the steam from damaging the bottle body 1.

[0028] An air inlet 3.4 is provided between the bottle body connecting portion 3.3 and the nozzle 3. The air inlet 3.4 is communicated with the bottle body 1. A switch paddle 7 is provided on the nozzle 3 or the housing. The switch paddle 7 is provided with a switch through hole 7.1. The switch paddle 7 is movably provided on the nozzle 3 or the housing and, when moved, closes the air inlet 3.4 or communicates with the air inlet 3.4 through the switch through hole 7.1.

[0029] When the air inlet 3.4 is closed, the air in the bottle body 1 is isolated from the external atmospheric pressure and is not connected. When the switch through hole 7.1 and the air inlet 3.4 are connected to each other, the air in the bottle body 1 is connected to the external atmospheric pressure. This not only helps to release the pressure of the steam ejected from the extension tube, but also increases the atmospheric pressure entering the bottle body 1. The cleaning liquid in the bottle body 1 uses the atmospheric pressure to generate another larger driving force, allowing the cleaning liquid to enter the cleaning liquid channel 3.1 more quickly and quickly mix with the steam to have greater potential energy for ejection.

[0030] The nozzle 3 is provided with a neck 3.5 toward the bottle body connection portion 3.3. The bottle body connection portion 3.3 is connected to the nozzle 3 through the neck 3.5. The air inlet 3.4 is provided on the neck 3.5. A movable opening 8 is provided on the shell. The movable opening 8 corresponds to the air inlet 3.4. The switch paddle 7 is movably provided on the movable opening 8.

[0031] The switch paddle 7 is provided with a positioning portion 7.2, and the nozzle 3 or the housing is provided with a positioning matching portion 9. The switch paddle 7 is movably positioned on the positioning matching portion 9 through the positioning portion 7.2.

[0032] In this embodiment, the switch paddle 7 is provided with a movable portion whose shape matches that of the neck 3.5. A switch through-hole 7.1 and a positioning portion 7.2 are respectively positioned above and below the movable portion. The switch paddle 7 reciprocates along the periphery of the neck 3.5 over the movable opening 8 via the movable portion. The positioning portion 9 is provided on the spray nozzle 3. When the switch paddle 7 is positioned on one side of the movable opening 8, the movable portion blocks the air inlet 3.4, and the positioning portion 7.2 is positioned on one side of the positioning portion 9, closing the air inlet 3.4. When the switch paddle 7 is positioned on the other side of the movable opening 8, the switch through-hole 7.1 and the air inlet 3.4 communicate with each other, and the positioning portion 7.2 is positioned on the other side of the positioning portion 9, opening the air inlet 3.4, allowing outside air to enter the bottle body 1 through the switch through-hole 7.1 and the air inlet 3.4.

[0033] The nozzle 3 is further provided with an air jet channel 3.6, which is located at the front end of the cleaning liquid channel 3.1. The front end of the extension tube extends through the cleaning liquid channel 3.1 and is located in the air jet channel 3.6, forming a negative pressure mixing area with the air jet port 3.2.

[0034] The inner diameter of the jet channel 3.6 is smaller than that of the cleaning liquid channel 3.1, and a diameter-reducing connecting portion 3.7 is provided between the two channels. The inner diameter of the jet channel 3.6 gradually decreases toward the jet port 3.2.

[0035] In this embodiment, the cross-sections of the jet channel 3.6 and the variable diameter connecting portion 3.7 are both tapered. At the same time, the difference in inner diameter between the jet channel 3.6 and the cleaning liquid channel 3.1 is utilized to enable the cleaning liquid to generate a large active potential energy in the cleaning liquid channel 3.1, and at the same time, the cleaning liquid and steam can be quickly ejected from the jet port 3.2.

[0036] The extension tube includes a hose 10 and a hard tube 11. The hose 10 is located in the cleaning liquid channel 3.1, and its rear end is connected to the connector 2. The rear end of the hard tube 11 is located in the cleaning liquid channel 3.1 and is connected to the front end of the hose 10. The front end of the hard tube 11 extends into the jet channel 3.6 and forms a negative pressure mixing area between it and the jet port 3.2.

[0037] In this embodiment, the hose 10 and the connecting tube 6 are both silicone tubes, the hard tube 11 is a copper tube, the rear end of the hose 10 is sleeved on the connector 2, and the rear end of the hard tube 11 is sleeved on the front end of the hose 10.

[0038] The shell includes a first shell 12 and a second shell 13. The first shell 12 and the second shell 13 are fixed to each other, and a shell inner cavity 14 is formed between the two to pass through the front and back. The connecting head 2 is located in the shell inner cavity 14, and the nozzle 3 is at least partially located in the shell inner cavity 14 and is detachably connected to the connecting head 2. The remaining part of the nozzle 3 is located outside the shell inner cavity 14, and a nozzle seal 15 is provided on it, and a cleaning accessory is sealed and disassembled through the nozzle seal 15. The bottom of the shell inner cavity 14 is also provided with an inner cavity bottom opening, and a bottle body connecting part 3.3 is provided on the nozzle 3. The bottle body connecting part 3.3 is located outside the inner cavity bottom opening, and a bottle body seal 19 is provided between the bottle body 1, and the bottle body 1 is detachably and sealedly connected to the bottle body connecting part 3.3 through the bottle body seal 19.

[0039] In this embodiment, the first shell 12 and the second shell 13 are arranged on the left and right, and the two are fixed to each other by fasteners 20. The rear end of the nozzle 3 is located in the inner cavity 14 of the shell, and is detachably connected to the connecting head 2 by a snap buckle. The front end of the nozzle 3 is located outside the inner cavity 14 of the shell, and is detachably connected to the cleaning accessories by a snap buckle. The disassembly and connection of the cleaning accessories can be convenient for users to replace according to different cleaning needs. In addition, the cleaning accessories and the nozzle 3 can also be sealed by the nozzle seal 15 to avoid leakage of cleaning liquid and steam. In addition, the bottle body seal 19 is positioned on the external thread of the bottle body 1. When the bottle body 1 is assembled, the bottle body seal 19 seals on the bottle body connection part 3.3 to achieve a sealed fit between the bottle body 1 and the nozzle 3.

[0040] A connecting seat 16 is provided at the rear end of the first shell 12 and the second shell 13, and a steam cleaning machine 17 is installed and removed through the connecting seat 16. When assembled, the injection port of the steam cleaning machine 17 is connected to the rear end of the steam channel 2.1. The connector 2 is provided with a connector seal 18 and is sealed and assembled in the cleaning liquid channel 3.1 through the connector seal 18 to achieve mutual sealed communication between the front end of the steam channel 2.1 and the rear end of the cleaning liquid channel 3.1.

[0041] In this embodiment, the front end of the connector 2 and the rear end of the nozzle 3 are detachably connected by a snap fastener, and the connector 2 and the nozzle 3 are sealed by a connector seal 18, which can prevent steam leakage. In addition, the steam cleaning machine 17 and the connector 2 are detachably connected by a snap fastener, and a cleaning machine seal is also provided between the steam cleaning machine 17 and the connector 2, and the two are sealed by the cleaning machine seal, which can also prevent steam leakage.

[0042] The above is a preferred embodiment of the present invention, which illustrates and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention, which is defined by the appended claims and their equivalents.

Claims

1. A cleaning liquid spray gun, comprising a housing and a bottle (1) for storing cleaning liquid, characterized in that: The shell is provided with a connector (2) and a nozzle (3), a steam channel (2.1) is provided in the connector (2), and a cleaning liquid channel (3.1) is provided in the nozzle (3), the connector (2) and the nozzle (3) are detachably connected, and when the two are assembled, the steam channel (2.1) and the cleaning liquid channel (3.1) are communicated with each other, the bottle (1) is detachably mounted on the shell, and when assembled, it is communicated with the cleaning liquid channel (3.1), an air jet (3.2) is provided at the end of the nozzle (3), an extension tube is connected to the connector (2), the extension tube is communicated with the steam channel (2.1), and extends in the cleaning liquid channel (3.1) and close to the air jet (3.2), and a negative pressure mixing area is formed between the extension tube and the air jet (3.2).

2. The cleaning liquid spray gun according to claim 1, characterized in that: The nozzle (3) is provided with a bottle body connecting portion (3.3), and is detachably connected to the bottle body (1) through the bottle body connecting portion (3.3); a one-way valve (4) is provided between the steam channel (2.1) and the bottle body connecting portion (3.3); one end of the one-way valve (4) is communicated with the cleaning liquid channel (3.1), and the other end is communicated with a switching connecting piece (5), and is connected with a connecting pipe (6) extending into the bottle body (1) through the switching connecting piece (5).

3. The cleaning liquid spray gun according to claim 2, characterized in that: An air inlet (3.4) is provided between the bottle body connecting portion (3.3) and the spray head (3), the air inlet (3.4) and the bottle body (1) are in communication with each other, a switch paddle (7) is provided on the spray head (3) or the shell, a switch through hole (7.1) is provided on the switch paddle (7), the switch paddle (7) is movably provided on the spray head (3) or the shell, and when in motion, closes the air inlet (3.4) or is in communication with the air inlet (3.4) through the switch through hole (7.1).

4. The cleaning liquid spray gun according to claim 3, characterized in that: The spray head (3) is provided with a neck (3.5) in the direction of the bottle body connecting portion (3.3); the bottle body connecting portion (3.3) is connected to the spray head (3) through the neck (3.5); the air inlet (3.4) is provided on the neck (3.5); a movable opening (8) is provided on the shell; the movable opening (8) corresponds to the air inlet (3.4); and the switch paddle (7) is movably provided on the movable opening (8).

5. The cleaning liquid spray gun according to claim 3 or 4, characterized in that: The switch paddle (7) is provided with a positioning portion (7.2), the nozzle (3) or the housing is provided with a positioning matching portion (9), and the switch paddle (7) is movably positioned on the positioning matching portion (9) via the positioning portion (7.2).

6. The cleaning liquid spray gun according to claim 1, characterized in that: An air jet channel (3.6) is further provided in the nozzle (3), and the air jet channel (3.6) is located at the front end of the cleaning liquid channel (3.1). The front end of the extension tube extends through the cleaning liquid channel (3.1) and is located in the air jet channel (3.6), forming the negative pressure mixing area between the extension tube and the air jet port (3.2).

7. The cleaning liquid spray gun according to claim 6, characterized in that: The inner diameter of the jet channel (3.6) is smaller than the inner diameter of the cleaning liquid channel (3.1), a diameter-reducing connecting portion (3.7) is provided between the two, and the two are connected to each other through the diameter-reducing connecting portion (3.7), and the inner diameter of the jet channel (3.6) gradually decreases towards the jet port (3.2).

8. The cleaning liquid spray gun according to claim 6, characterized in that: The extension tube comprises a hose (10) and a hard tube (11); the hose (10) is located in the cleaning liquid channel (3.1), and its rear end is cooperatively connected to the connector (2); the rear end of the hard tube (11) is located in the cleaning liquid channel (3.1), and is cooperatively connected to the front end of the hose (10); the front end of the hard tube (11) extends into the jet channel (3.6), and forms the negative pressure mixing area between the hard tube (11) and the jet port (3.2).

9. The cleaning liquid spray gun according to claim 1, characterized in that: The shell comprises a first shell (12) and a second shell (13), the first shell (12) and the second shell (13) are fixed to each other, and a shell inner cavity (14) is formed between the first shell (12) and the second shell (13) and runs through the shell inner cavity (14). The connector (2) is located in the shell inner cavity (14), the nozzle (3) is at least partially located in the shell inner cavity (14) and is detachably connected to the connector (2), and the remaining portion of the nozzle (3) is located outside the shell inner cavity (14) and is provided with a nozzle. A nozzle seal (15) is provided, and a cleaning accessory is sealed and disassembled through the nozzle seal (15); the bottom of the shell cavity (14) is also provided with an inner cavity bottom opening; a bottle body connecting portion (3.3) is provided on the nozzle (3); the bottle body connecting portion (3.3) is located outside the inner cavity bottom opening, and a bottle body seal (19) is provided between the bottle body connecting portion (3.3) and the bottle body (1); the bottle body (1) is detachably and sealably connected to the bottle body connecting portion (3.3) through the bottle body seal (19).

10. The cleaning liquid spray gun according to claim 9, characterized in that: A connecting seat (16) is provided at the rear ends of the first shell (12) and the second shell (13), and a steam cleaning machine (17) is detachably mounted via the connecting seat (16). When assembled, the steam cleaning machine (17) has a jet port that is in communication with the rear end of the steam channel (2.1). A connecting head seal (18) is provided on the connecting head (2), and the connecting head seal (18) is sealed and assembled in the cleaning liquid channel (3.1), thereby achieving mutually sealed communication between the front end of the steam channel (2.1) and the rear end of the cleaning liquid channel (3.1).

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