Foam spray gun

Abstract

The utility model provides a foam spray gun, and belongs to the technical field of cleaning tools. The technical problem that an existing foam spray gun is high in cost is solved. The foam spray gun comprises a main connector, an outer connector, a Venturi tube, a liquid suction nozzle, an air valve element and a nozzle element, the main connector comprises a plastic shell and a metal inner core, the metal inner core is fixed in the plastic shell, one end of the metal inner core is connected with the outer connector, a mixing cavity is formed in the middle section of the metal inner core, and the nozzle element is fixedly connected in the mixing cavity. The upper end of the plastic shell is connected with an air valve element, the air valve element is communicated with the air inlet, the lower end of the plastic shell is connected with a liquid suction nozzle, the liquid suction nozzle is communicated with the liquid suction port, and the other end of the plastic shell is connected with a Venturi tube. And the other end of the plastic shell is provided with a communicating hole for communicating the venturi tube and the outflow hole. The utility model has the advantages of lower cost and lighter weight.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of cleaning tools, and relates to a foam spray gun. BACKGROUND

[0002] The foam spray gun is a cleaning tool for generating foam, and through the negative pressure formed by high-speed water flow, external air and cleaning liquid are mixed and then foamed through a foaming structure. The foam spray gun is widely used in the cleaning industry such as car washing. The current foam spray gun generally adopts a copper main connector, which is a four-way structure and is connected with an external connector, a Venturi tube, a liquid suction nozzle and a nozzle core. After the gas and liquid are mixed in the copper main connector, they become foam and are sprayed out through the Venturi tube and the foaming block in sequence. The above structure is disclosed in the Chinese patent documents for a plastic foam generator for a metal foam kettle

application number 202220562635.0

application number 202322450483.2

[0003] The utility model aims at the above problems existing in the prior art, and provides a foam spray gun. The technical problem solved by the utility model is to reduce the cost.

[0004] The purpose of the utility model can be achieved by the following technical scheme:

[0005] A foam spray gun comprises a main connector, an external connector, a Venturi tube, a liquid suction nozzle, a gas valve core and a nozzle core. The main connector comprises a plastic shell and a metal inner core. The metal inner core is fixed in the plastic shell. One end of the metal inner core is connected with the external connector. A mixing cavity is arranged in the middle section of the metal inner core. The nozzle core is fixedly connected in the mixing cavity. The other end of the metal inner core is provided with an outflow hole. The middle section of the metal inner core is further provided with an air inlet and a liquid suction port. The air inlet and the liquid suction port are located in front of the nozzle core. The upper end of the plastic shell is connected with the gas valve core. The gas valve core is in communication with the air inlet. The lower end of the plastic shell is connected with the liquid suction nozzle. The liquid suction nozzle is in communication with the liquid suction port. The other end of the plastic shell is connected with the Venturi tube. The other end of the plastic shell is provided with a communication hole in communication with the Venturi tube and the outflow hole.

[0006] The specific principle is as follows: the outer connector is connected with the high-pressure water gun, the high-speed water flow enters the mixing chamber after passing through the nozzle core, a negative pressure is formed in the mixing chamber, the external gas enters the mixing chamber after passing through the air valve core and the air inlet, the cleaning liquid in the foam kettle enters the mixing chamber after passing through the liquid suction nozzle and the liquid suction port, the gas, the cleaning liquid and the water are mixed in the mixing chamber, and then enter the venturi tube through the outflow hole and the communication hole, and then become foam after passing through the foaming block and are sprayed out.

[0007] The main connector is composed of a plastic shell made of plastic and a metal inner core made of metal, which can reduce the use of metal materials and thus reduce the manufacturing material cost, and the weight of the foam spray gun can be reduced due to the fact that the mass of plastic is much smaller than that of metal, so that the user can hold the foam spray gun more comfortably.

[0008] In the foam spray gun, the plastic shell and the metal inner core are fixedly connected through insert injection molding process. The insert injection molding process can make the plastic shell and the metal inner core more tightly and firmly fixed without additional sealing parts.

[0009] In the foam spray gun, the outer peripheral wall of the metal inner core is provided with a plurality of inlaid grooves, and the plurality of inlaid grooves are arranged in the circumferential direction. After insert injection molding, part of the plastic shell is embedded in the inlaid groove, which makes the metal inner core and the plastic shell more firmly fixed in the circumferential direction, so that the metal inner core can withstand the force when the nozzle core and the outer connector are screwed in.

[0010] In the foam spray gun, the metal inner core is made of aluminum or copper.

[0011] In the foam spray gun, the upper end of the plastic shell is provided with a threaded hole one, the air valve core is screwed in the threaded hole one, and the bottom of the threaded hole one is provided with a communication hole one, which is aligned and communicated with the air inlet.

[0012] In the foam spray gun, the diameter of the communication hole one is the same as that of the air inlet. After the insert injection molding is completed, the plastic shell and the metal inner core form the communication hole one and the air inlet through the same drilling, and the equal-diameter communication hole one and air inlet can ensure smooth air suction into the mixing chamber.

[0013] In the foam spray gun, the lower end of the plastic shell is provided with a threaded hole two, the liquid suction nozzle is screwed in the threaded hole two, and the bottom of the threaded hole two is provided with a communication hole two, which is aligned and communicated with the liquid suction port.

[0014] In the foam spray gun, the diameter of the communication hole two is the same as that of the liquid suction port. After the insert injection molding is completed, the plastic shell and the metal inner core form the communication hole two and the liquid suction port through the same drilling, and the equal-diameter communication hole two and liquid suction port can ensure smooth flow of the cleaning liquid into the mixing chamber.

[0015] In the foam spray gun described above, the inner diameter of the outlet hole is smaller than the inner diameter of the mixing chamber, while the inner diameter of the connecting hole is larger than the inner diameter of the outlet hole. This structure improves the gas-liquid mixing effect, reduces the pressure at the connecting hole, and also decreases the pressure on the plastic shell at the connecting hole.

[0016] Compared with existing technologies, this foam spray gun has the advantages of lower cost and lighter weight while ensuring performance. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the foam spray gun.

[0018] Figure 2 This is a cross-sectional structural diagram of the foam spray gun.

[0019] Figure 3 This is a schematic diagram of the three-dimensional structure of the metal core.

[0020] Figure 4 This is a three-dimensional structural diagram of the metal core from another perspective.

[0021] Figure 5 This is a schematic diagram of the three-dimensional structure of the plastic shell.

[0022] In the diagram: 1. Main connector; 2. Plastic outer shell; 21. Threaded hole one; 22. Connecting hole one; 23. Threaded hole two; 24. Connecting hole two; 25. Connecting hole; 3. Metal inner core; 31. Mixing chamber; 32. Embedding groove; 33. Outlet hole; 34. Air inlet; 35. Liquid suction port; 4. External connector; 5. Venturi tube; 6. Liquid suction nozzle; 7. Air valve core; 8. Nozzle core. Detailed Implementation

[0023] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0024] like Figures 1 to 5 As shown, the foam spray gun includes a main connector 1, an outer connector 4, a venturi tube 5, a suction nozzle 6, an air valve core 7, and a nozzle core 8. The main connector 1 includes a plastic outer shell 2 and a metal inner core 3. The metal inner core 3 is made of aluminum or copper. Preferably, aluminum is cheaper and lighter. In this embodiment, the metal inner core 3 is made of aluminum. The outer peripheral wall of the metal inner core 3 is provided with a plurality of inlay grooves 32, which are arranged in a circumferential array. The plastic outer shell 2 and the metal inner core 3 are fixedly connected by an insert injection molding process. The insert injection molding process is a mature process in which the metal part is placed in a mold and then plastic is injected to form the plastic and the metal part as one piece. After the insert is injection molded, part of the plastic outer shell 2 will be embedded in the inlay groove 32. Through this process, the plastic outer shell 2 and the metal inner core 3 are sealed and firmly fixed.

[0025] One end of the metal inner core 3 is connected with the outer connector 4, the middle section of the metal inner core 3 is provided with a mixing cavity 31, the nozzle core 8 is screwed at one end of the mixing cavity 31 close to the outer connector 4, the other end of the metal inner core 3 is provided with an outflow hole 33, the middle section of the metal inner core 3 is further provided with an air inlet 34 and a liquid suction port 35, the air inlet 34 and the liquid suction port 35 are located in front of the nozzle core 8.

[0026] The upper end of the plastic shell 2 is provided with a threaded hole one 21, the air valve core 7 is screwed at the threaded hole one 21, the bottom of the threaded hole one 21 is provided with a communication hole one 22, the communication hole one 22 is aligned and communicated with the air inlet 34, the communication hole one 22 and the air inlet 34 are formed by the same drilling and have the same diameter and are aligned and communicated, the air valve core 7 can control the amount of air entering the air inlet 34. The lower end of the plastic shell 2 is provided with a threaded hole two 23, the liquid suction nozzle 6 is screwed at the threaded hole two 23, the bottom of the threaded hole two 23 is provided with a communication hole two 24, the communication hole two 24 is aligned and communicated with the liquid suction port 35, the communication hole two 24 and the liquid suction port 35 are formed by the same drilling and have the same diameter and are aligned and communicated, the liquid suction nozzle is connected with a pipeline, the pipeline extends into the liquid storage barrel.

[0027] The other end of the plastic shell 2 is screwed with the Venturi tube 5, the other end of the plastic shell 2 is provided with a communication hole 25 which communicates the Venturi tube 5 and the outflow hole 33, the inner diameter of the outflow hole 33 is smaller than the inner diameter of the mixing cavity 31, the inner diameter of the communication hole 25 is larger than the inner diameter of the outflow hole 33.

[0028] The specific principle is as follows: the outer connector 4 is connected with a high-pressure water gun, high-speed water flow enters the mixing cavity 31 after passing through the nozzle core 8, negative pressure is formed in the mixing cavity 31, external gas enters the mixing cavity 31 after passing through the air valve core 7 and the air inlet 34, cleaning liquid in the foam kettle enters the mixing cavity 31 after passing through the liquid suction nozzle 6 and the liquid suction port 35, the gas, the cleaning liquid and the water are mixed in the mixing cavity 31, then enter the Venturi tube 5 through the outflow hole 33 and the communication hole 25, and then become foam after passing through the foaming block and are sprayed out.

[0029] The air valve core 7 and the liquid suction nozzle 6 are only affected by negative pressure, and the sealing requirement is relatively low, therefore, the air valve core 7 and the liquid suction nozzle 6 are connected with the plastic shell 2 to meet the sealing strength, the outer connector 4 is connected with a high-pressure water pump, and the sealing requirement is relatively high, therefore, the outer connector 4 is directly connected with the metal inner core 3 to meet the sealing requirement under high pressure, so that the main connector 1 can meet the use requirement of the foam spray gun.

[0030] The specific embodiments described in the present text are merely illustrative of the spirit of the present application. Those skilled in the art to which the present application belongs can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

Claims

1. A foam lance comprising a main connector (1), an outer connector (4), a venturi (5), a liquid suction nozzle (6), a gas valve spool (7) and a nozzle core (8), characterized in that, The main joint (1) comprises a plastic shell (2) and a metal inner core (3), the metal inner core (3) is fixed in the plastic shell (2), one end of the metal inner core (3) is connected with an outer joint (4), a middle section of the metal inner core (3) is provided with a mixing cavity (31), a nozzle core (8) is fixedly connected in the mixing cavity (31), the other end of the metal inner core (3) is provided with an outflow hole (33), the middle section of the metal inner core (3) is further provided with an air inlet (34) and a liquid suction port (35), the air inlet (34) and the liquid suction port (35) are located in front of the nozzle core (8), the upper end of the plastic shell (2) is connected with a gas valve core (7), the gas valve core (7) is in communication with the air inlet (34), the lower end of the plastic shell (2) is connected with a liquid suction nozzle (6), the liquid suction nozzle (6) is in communication with the liquid suction port (35), the other end of the plastic shell (2) is connected with a venturi tube (5), the other end of the plastic shell (2) is provided with a communication hole (25) in communication with the venturi tube (5) and the outflow hole (33).

2. Foam lance according to claim 1, characterized in that The plastic shell (2) and the metal inner core (3) are fixedly connected through insert injection molding process.

3. The foam lance of claim 1, wherein, The outer peripheral wall of the metal inner core (3) is provided with a plurality of inlaid grooves (32), and the plurality of inlaid grooves (32) are arranged in the circumferential direction.

4. The foam lance of claim 1, wherein, The metal inner core (3) is made of aluminum or copper.

5. The foam lance of claim 1, wherein, The upper end of the plastic shell (2) is provided with a threaded hole one (21), the gas valve core (7) is screwed at the threaded hole one (21), the bottom of the threaded hole one (21) is provided with a communication hole one (22), and the communication hole one (22) is in alignment and communication with the air inlet (34).

6. The foam lance of claim 5, wherein, The diameter of the communication hole one (22) is the same as that of the air inlet (34).

7. The foam lance of claim 1, wherein, The lower end of the plastic shell (2) is provided with a threaded hole two (23), the liquid suction nozzle (6) is screwed at the threaded hole two (23), the bottom of the threaded hole two (23) is provided with a communication hole two (24), and the communication hole two (24) is in alignment and communication with the liquid suction port (35).

8. The foam lance of claim 7, wherein, The diameter of the communication hole two (24) is the same as that of the liquid suction port (35).

9. The foam lance of claim 1, wherein, The inner diameter of the outflow hole (33) is smaller than that of the mixing cavity (31), and the inner diameter of the communication hole (25) is larger than that of the outflow hole (33).

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