CN219850237U - Spray gun head and sprayer - Google Patents

Abstract

The utility model relates to a spray gun head and a sprayer, wherein the spray gun head comprises: a spray gun body; the liquid sucking and supplying device comprises a pressing handle and a piston movably arranged in the liquid sucking chamber; the liquid suction chamber is internally provided with a guide column which extends towards the piston and the extending direction of which is consistent with the moving direction of the piston, the piston is provided with a guide pore canal for the guide column to slide and extend into, the guide column is provided with an air guide section which is axially hollow, the spray gun body is also provided with an air guide channel which is communicated with the air guide section, the peripheral wall of the guide column is provided with a radially inward concave air inlet concave part, and air in the liquid suction chamber can enter into a gap between the peripheral wall of the guide column and the inner peripheral wall of the guide pore canal through the air inlet concave part under the state of reaching the set pressure so as to be further introduced into the air guide section of the guide column. The advantages are that: the gas in the liquid suction chamber can be continuously and stably discharged, and the liquid is ensured to be quickly sucked into the liquid suction chamber.

Description

Spray gun head and sprayer

Technical Field

The utility model relates to the technical field of spray gun heads, in particular to a spray gun head and a sprayer.

Background

The prior sprayer mainly comprises a spray gun head (or called a spray gun) and a liquid container, wherein the spray gun head is provided with a transfusion tube, one end of the transfusion tube stretches into the liquid container, the spray gun head (or called a spray gun) mainly comprises a connecting cap, a gun body, the spray head, a pressing handle and other structures, the lower end of the connecting cap is fastened to the upper end of the liquid container in a threaded connection mode, and the gun body is fastened to the upper end of the connecting cap. The gun body is provided with a pressure cavity, a piston is arranged in the pressure cavity, and a liquid spraying channel and a suction channel are arranged in the gun body and are matched with a liquid storage bottle for use. The working principle is that the internal pressure of the liquid storage bottle is increased by utilizing the internal pressure of the piston through the compression space, so that the liquid in the liquid storage bottle is sucked from the suction channel to the pressure cavity, and then the liquid in the pressure cavity is sprayed from the liquid spraying channel.

For example, chinese patent application No. CN202121266222.X (issued to Notification No. CN 215400427U) discloses a spray gun head, which comprises a gun body, wherein a compression cavity is arranged on the gun body, a piston is slidably arranged in the compression cavity, and a pressing handle is also hinged on the gun body and connected with the piston. The piston comprises a piston rod and a piston body which are connected, the piston rod is movably connected with the pressing handle, an outer skirt edge which is close to the first air inlet liquid inlet hole is arranged on the piston body, and the outer skirt edge is arranged in a sealing mode with the inner wall of the compression cavity. In order to realize stable sliding of the piston body in the compression cavity, a guide rod close to the first air inlet liquid inlet hole is arranged in the compression cavity, a guide groove is formed in the piston body, and the guide rod is arranged in the guide groove in a sliding sealing mode. In addition, be equipped with the second elastic component between pressing handle and the compression chamber, the second elastic component includes first elastic part, and the one end of first elastic part is equipped with the first joint portion with pressing handle joint, and the other end of first elastic part is equipped with the second joint portion with rifle body joint. The first elastic part comprises at least two elastic arms positioned outside the compression cavity, the elastic arms are bent, the second clamping part comprises a connecting arm and at least two clamping arms arranged at intervals, one ends of the two elastic arms are connected and provided with a first clamping part, one ends of the two clamping arms are connected through the connecting arm, the clamping arms are connected with the other ends of the elastic arms in one-to-one correspondence, and the clamping arms are clamped with the outer wall of the compression cavity.

However, the spray gun head in the above patent application has a certain disadvantage, and because the guide groove of the piston body is in sliding sealing contact with the guide rod in the compression cavity, in the compression movement process of the piston body, the gas in the compression cavity cannot be timely and continuously discharged, so that the spray gun head cannot be rapidly filled into the compression cavity after being pressed for many times, and the spray use experience of a user is affected.

Disclosure of Invention

The first technical problem to be solved by the utility model is to provide a spray gun head capable of continuously and stably discharging gas in a liquid suction chamber so as to ensure that liquid is quickly sucked into the liquid suction chamber.

The second technical problem to be solved by the utility model is to provide a sprayer applying the spray gun head aiming at the current state of the art.

The technical scheme adopted by the utility model for solving the first technical problem is as follows: a spray gun head comprising:

the spray gun body is provided with a liquid suction cavity, a liquid outlet flow channel and a jet orifice communicated with the liquid outlet flow channel, and the spray gun body is also provided with a connecting part used for being connected with an external container;

the liquid sucking and supplying device comprises a pressing handle and a piston movably arranged in the liquid sucking cavity, wherein the piston is driven by the pressing handle to suck external liquid into the liquid sucking cavity and apply pressure to the liquid sucked into the liquid sucking cavity so as to be pressed into the liquid outlet flow channel;

the liquid suction chamber is internally provided with a guide column which extends towards the piston and has the same extending direction as the piston, the piston is provided with a guide pore canal which is used for the guide column to slide and extend into, the guide column is provided with an air guide section which is axially hollow, the spray gun body is also provided with an air guide channel which is communicated with the air guide section, an air outlet of the air guide channel is positioned at the connecting part of the spray gun body and can be communicated with an inner cavity of a container connected to the connecting part of the spray gun body, the outer peripheral wall of the guide column is provided with a radially inwards concave air inlet concave part, and air in the liquid suction chamber can enter into a gap between the outer peripheral wall of the guide column and the inner peripheral wall of the guide pore canal through the air inlet concave part under the state of reaching a set pressure, so that the air guide section of the guide column is introduced.

In order to facilitate the evacuation through the air intake recess, the air intake recess in the guide post in the liquid suction chamber is disposed adjacent to the root of the guide post and is configured as a length of groove structure extending along the length of the guide post.

In order to ensure the stability of the exhaust gas by the above-mentioned air intake concave portions, the air intake concave portions have at least two, and each of the air intake concave portions is distributed at intervals along the circumferential direction of the guide post.

In order to ensure that the piston has enough moving stroke in the liquid suction cavity, one end of the piston, which faces the guide post, is provided with an axially extending connecting sleeve, the connecting sleeve is axially hollow to form the guide pore canal, and the port of the guide pore canal is a necking structure with caliber reduced relative to the main body part of the guide pore canal.

In order to realize the liquid sucking and discharging function, the spray gun body is also provided with a liquid inlet channel communicated with the liquid sucking cavity, a liquid inlet of the liquid inlet channel is positioned at the connecting part of the spray gun body, and a one-way valve component for the liquid in the external container to enter the liquid inlet channel in a one-way is further arranged at the liquid inlet of the liquid inlet channel.

As an improvement, the one-way valve assembly comprises a valve seat with a through hole extending vertically and a wave bead movably matched with the port of the through hole of the valve seat, wherein the wave bead can open the port of the through hole of the valve seat when the liquid suction chamber is in a negative pressure state and can block the port of the through hole of the valve seat when the pressure in the liquid suction chamber is greater than a set pressure state.

In order to firmly assemble the valve seat to the spray gun body, the valve seat is pressed against the liquid inlet of the liquid inlet flow channel through a blank cap arranged at the connecting part of the spray gun body.

In order to realize 360-degree rotation after the spray gun head is mounted on a container (such as a bottle), the spray gun further comprises a connecting cap which is rotatably connected to the connecting part of the spray gun body and is used for being in threaded connection with the mouth part of an external container, and a sealing gasket for abutting against the blank cap is arranged in the connecting cap.

In order to facilitate the user to press the operation to drive the piston to move in the liquid suction chamber, the liquid suction device comprises:

the pressing handle is rotationally connected to the spray gun body and is connected with the piston through a connecting arm extending inwards, and the pressing handle can deflect between a first position folded relative to the spray gun body and a second position far away from the spray gun body under the action of external force;

the elastic piece is arranged on the spray gun body, acts on the pressing handle and always has a trend of moving towards the second position until the pressing handle.

The elastic piece can drive the pressing handle to reset to the initial position when the pressing handle is released by a user, so that the user presses the pressing handle next time, and the labor is saved.

The elastic piece can adopt various prior arts and can comprise various elastic elements such as a pressure spring, a torsion spring and a reed, but in order to better match the spray gun body, the spray gun body is integrally L-shaped and comprises a transverse part for arranging the liquid outlet flow channel and the spray opening and a vertical part serving as the connecting part, the spray gun body is provided with a liquid suction cavity at the position where the transverse part is connected with the vertical part, the peripheral wall of the liquid suction cavity is integrally cylindrical and extends obliquely from top to bottom towards one side where the spray opening is positioned, the elastic piece is an elastic sleeve body sleeved at the periphery of the liquid suction cavity, two elastic support arms which are arranged at intervals and extend towards the position where the pressing handle is positioned and are connected at the tail end are arranged on the elastic sleeve body, a first position-giving notch for embedding the transverse part into the liquid suction cavity is arranged at intervals on the elastic sleeve body, and a second position-giving notch for embedding the liquid suction cavity into the vertical part is also arranged on the elastic sleeve body at the region opposite to the first position-giving notch.

The elastic sleeve body is preferably a plastic piece with a shaping variable, when a user presses the pressing handle, the pressing handle presses the elastic support arm of the elastic sleeve body, the elastic sleeve body is integrally deformed to a certain extent and accumulates a certain potential energy, after the user releases the pressing handle, the elastic sleeve body resets, the pressing handle is driven to reset to an initial position through the elastic support arm, and the user can press the handle next time conveniently.

The utility model solves the second technical problem by adopting the technical proposal that: the sprayer comprises a liquid container and a spray gun head connected to the liquid container, and is characterized in that the spray gun head adopts the spray gun head.

Compared with the prior art, the utility model has the advantages that: after the air inlet concave part is arranged on the peripheral wall of the guide post of the liquid suction cavity, air in the liquid suction cavity can continuously enter a gap between the peripheral wall of the guide post and the inner peripheral wall of the guide hole of the piston through the air inlet concave part under a set pressure state, and then sequentially enter a container connected with the spray gun head through the air guide section of the guide post and the air guide channel of the spray gun body, so that liquid in the container can be quickly sucked into and fills the liquid suction cavity, the spraying effect at the spraying port of the spray gun head is further guaranteed, and the spraying experience of a user is effectively improved.

Drawings

FIG. 1 is a schematic perspective view of a spray gun head according to an embodiment of the present utility model;

FIG. 2 is an exploded view of FIG. 1;

FIG. 3 is a cross-sectional view of FIG. 1;

FIG. 4 is a cross-sectional perspective view of a spray gun body according to an embodiment of the present utility model;

FIG. 5 is a schematic perspective view of FIG. 1 with parts such as a housing omitted;

FIG. 6 is a schematic perspective view of FIG. 5 with the handle omitted;

FIG. 7 is a right side view of FIG. 5 with the push handle omitted (the spring housing not being compressed);

FIG. 8 is a right side view of FIG. 5 with the push handle omitted (the spring housing being in a compressed state);

FIG. 9 is a schematic perspective view of an elastic sleeve according to an embodiment of the present utility model;

FIG. 10 is a schematic view of another perspective view of an elastic sleeve according to an embodiment of the present utility model;

fig. 11 is a right side view of fig. 5 with the push handle omitted (the spring housing is not compressed).

Detailed Description

The utility model is described in further detail below with reference to the embodiments of the drawings.

In the description and claims of the present utility model, terms indicating directions, such as "front", "rear", "upper", "lower", "left", "right", "side", "top", "bottom", etc., are used to describe various example structural parts and elements of the present utility model, but these terms are used herein for convenience of description only and are determined based on the example orientations shown in the drawings. Because the disclosed embodiments of the utility model may be arranged in a variety of orientations, the directional terminology is used for purposes of illustration and is in no way limiting, such as "upper" and "lower" are not necessarily limited to being in a direction opposite or coincident with the direction of gravity.

Referring to fig. 1-11, a spray gun head includes a gun body, a liquid suction and supply device, a one-way valve assembly, a water distribution stem assembly 80, a cap 52, and a gasket 54. The gun body comprises a spray gun body 20 and a shell 10, wherein the shell 10 is covered outside the spray gun body 20 to ensure the whole aesthetic property. Specifically, the rear side of the spray gun body 20 is provided with a backward protruding buckle 200, the shell 10 is provided with a bayonet 11 for the buckle 200 to be blocked, after the shell 10 is sleeved on the spray gun body 20, the buckle 200 on the spray gun body 20 is blocked into the bayonet 11 of the shell 10, so that the shell 10 is prevented from being easily separated when the spray gun head falls.

Referring to fig. 7, the spray gun body 20 is generally L-shaped and specifically includes a transverse portion 21 extending in a substantially horizontal direction and a vertical portion 22 extending in a substantially vertical direction, the transverse portion 21 being substantially perpendicular to the vertical portion 22. In which the spray gun body 20 is constructed with a liquid suction chamber 23 of a cylindrical shape as a whole at a position where the lateral portion 21 meets the vertical portion 22, the liquid suction chamber 23 being inclined to extend from top to bottom toward a side where the injection port 250 of the lateral portion 21 is located, and an opening for the piston 40 to be fitted therein being formed at an end portion.

Referring to fig. 3, a liquid outlet channel 25 is provided along the extending direction of the horizontal portion 21 of the spray gun body 20, a water diversion rod assembly 80 is provided in the liquid outlet channel 25, a spray cap 29 is provided at the port of the liquid outlet channel 25, and a spray orifice 250 is provided on the spray cap 29 to atomize the liquid sprayed therefrom.

The water diversion rod assembly 80 can be the water diversion rod assembly 80 (i.e. continuous pressing assembly) of the prior patent application CN113953110A of the inventor, namely, a spray gun with continuous pressing function, wherein the water diversion rod of the continuous pressing assembly is automatically closed under the action of an elastic piece in the liquid suction and supply process, so that the air backflow is prevented, the purposes of instant sealing and instant liquid cutting are achieved, the sealing performance and the bursting force of spraying are stronger, and the liquid dropping phenomenon is avoided. When liquid enters the continuous pressure cavity through the liquid inlet 270, the liquid separating rod compresses the elastic member under the action of liquid pressure, the elastic member is kept in a compressed state, and when the spraying process is nearly finished, the liquid separating rod returns and pushes out the liquid through the elastic force of the elastic member to generate continuous pressure, so that spraying is generated through the spraying port 250 under strong pressure and high speed.

With continued reference to fig. 3, the top of the liquid suction chamber 23 of the spray gun body 20 communicates with the liquid outlet flow passage 25. A liquid inlet channel 27 is formed in the vertical portion 22 of the spray gun body 20. The liquid inlet 270 of the liquid inlet channel 27 is positioned at the connecting part 26 of the spray gun body 20, and a one-way valve assembly for the liquid in the external container to enter the liquid inlet channel 27 in a one-way is arranged in the liquid inlet channel 27. The check valve assembly includes a valve seat 51 and a bead 50, wherein the valve seat 51 is formed in a rod shape as a whole and has a through hole 510 opened along a length direction thereof. The lower port of the through hole 510 may be inserted with a pipette capable of extending into the container, and the upper port is provided with a wave bead 50, specifically, when the valve seat 51 is installed in place in the liquid inlet flow channel 27, a certain space for the wave bead 50 to move is provided between the valve seat 51 and the wall of the liquid inlet flow channel 27. When the liquid suction chamber 23 is in a negative pressure state, the beads 50 move upward to open the upper ports of the through holes 510 of the valve seat 51, so that external liquid can enter the liquid suction chamber 23 through the through holes 510 of the valve seat 51, the liquid inlet flow passage 27. When the pressure in the liquid suction chamber 23 is greater than the set pressure (for example, the pressing handle 30 is pressed to drive the piston 40 to move inwards), the wave bead 50 seals the upper port of the through hole 510 of the valve seat 51, so that the liquid in the liquid suction chamber 23 is prevented from flowing back into the container.

The liquid inlet 270 of the liquid inlet channel 27 of the spray gun body 20 is also provided with a cover cap 52, and the cover cap 52 is connected to the bottom end of the vertical part 22 of the spray gun body 20 and abuts against the annular flange on the valve seat 51, so that the valve seat 51 is prevented from falling out of the liquid inlet 270 of the liquid inlet channel 27. The bottom of the vertical portion 22 of the spray gun body 20 is the connection 26 for connection to an external container. The connecting plate is provided with a connecting cap 53 which can freely rotate, and the inner wall of the connecting cap 53 is provided with threads which can be used for being connected with a container for containing liquid. A gasket 54 is further provided in the connection cap 53, and an opening is provided in the middle of the gasket 54 for the bottom end of the valve seat 51 and the pipette to pass through. When the container is attached to the attachment cap 53, the finish of the container abuts against the bottom wall of the gasket 54 and the top wall of the gasket 54 abuts against the closure cap 52, thereby ensuring tightness thereat. Because the connecting cap 53 can rotate freely relative to the spray gun body 20, after the connecting cap 53 is connected with the container, the spray gun body 20 can rotate freely, so that the posture adjustment in the transportation process is convenient, and the problem of liquid leakage can not occur.

The liquid sucking and supplying device comprises a piston 40, a pressing handle 30 for driving the piston 40 to reciprocate and an elastic piece.

The piston 40 is reciprocally movably provided in the liquid suction chamber 23 along the axis of the liquid suction chamber 23. The outer peripheral wall of the piston 40 is in sealing contact with the inner peripheral wall of the suction chamber 23. The suction chamber 23 of the spray gun body 20 is provided at an inner end portion remote from the opening thereof with a guide post 24 extending in a direction substantially coincident with the axial direction of the suction chamber 23. Correspondingly, one end of the piston 40 facing the guide post 24 is provided with an axially extending connecting sleeve 41, and a guide hole 410 for the guide post 24 to extend into is axially formed in the connecting sleeve 41, wherein the guide hole 410 and the guide post 24 are in interference fit, and in particular, the port of the guide hole 410 is a shrinkage structure 411 with a caliber reduced relative to the main body part of the guide hole 410, so that the tightness between the guide post 24 and the connecting sleeve 41 of the piston 40 is ensured.

The pressing handle 30 is rotatably coupled to the lateral portion 21 of the spray gun body 20, and specifically, left and right sides of the lateral portion 21 of the spray gun body 20 have outwardly extending pins 211, and the pressing handle 30 is rotatably coupled to the two pins 211. The inside of the pressing handle 30 (i.e., the side facing the vertical portion 22 of the spray gun body 20) is provided with a connecting wall extending toward the position where the liquid suction chamber 23 is located, and the end of the connecting arm 31 is rotatably connected to the piston 40 located in the liquid suction chamber 23 through the opening of the liquid suction chamber 23. Specifically, the user operates the pressing handle 30, which is deflectable between a first position retracted relative to the spray gun body 20 and a second position remote from the spray gun body 20. When the handle 30 is pushed to deflect from the second position to the first position, the piston 40 moves inward along the liquid suction chamber 23, the pressure in the liquid suction chamber 23 increases, and the liquid in the liquid suction chamber 23 flows to the ejection port 250 through the liquid outlet passage 25 to generate a spray. When the pressing handle 30 is deflected from the first position to the second position, the piston 40 moves outward along the liquid suction chamber 23, a negative pressure is formed in the liquid suction chamber 23, the check valve assembly in the liquid inlet flow path 27 is opened, and the liquid in the external container is sucked into the liquid suction chamber 23 through the liquid inlet flow path 27.

Referring to fig. 9 and 10, the elastic member is an elastic sleeve body 60 sleeved with the periphery of the liquid suction chamber, the elastic sleeve body 60 is provided with two elastic support arms 61 which are arranged at intervals, extend towards the position of the pressing handle 30 and are connected at the tail end, and the end parts of the elastic support arms 61 are propped against the inner side of the pressing handle. During the deflection of the pressing handle 30 from the second position to the first position, the pressing handle 30 presses the elastic arms 61 of the elastic sleeve body 60, and the elastic sleeve body 60 is deformed to a certain extent as a whole and accumulates potential energy. After the user releases the pressing handle 30, the pressing handle 30 automatically resets to the initial position (i.e., the second position) under the action of the elastic arm 61 of the elastic sleeve body 60, and drives the piston 40 to move outwards, so that the user can press the handle 30 next time.

To facilitate the installation of the elastic sleeve 60, the two elastic arms 61 of the elastic sleeve 60 are spaced apart to define a first relief notch 62 in which the portion of the lateral portion 21 that meets the liquid suction chamber 23 is embedded. The elastic sleeve 60 is further provided with a second relief notch 63 in a region opposite to the first relief notch 62, in which the connection portion between the vertical portion 22 and the liquid suction chamber 23 is embedded.

In order to meet the environmental protection requirement, the elastic sleeve body 60 of the present embodiment is a plastic piece. Meanwhile, in order to ensure the grip feel of the handle pressed by the user during the use, the deformation amount of the elastic sleeve body 60 needs to be reasonably designed, specifically, referring to fig. 7 and 8, with reference to a cross section m perpendicular to the axis of the elastic sleeve body 60, an angle formed by an extending wall of the middle portion S of the elastic sleeve body 60 body intersecting the cross section m before being deformed under pressure is α1, an angle formed by the extending wall intersecting the cross section m after being deformed is α2, and the deformation amount is α1- α2. The deformation amount of the main body of the elastic sleeve body 60 of the present embodiment is 0 to 20 °, preferably 7 °. More specifically, the part of the main body of the elastic sleeve body 60 adjacent to the second yielding notch 63 is denoted as A, the part adjacent to the first yielding notch 62 is denoted as B, the part of the elastic support arm 61 of the elastic sleeve body 60 connected with the main body of the elastic sleeve body 60 is denoted as C, the part of the elastic support arm 61 adjacent to the end part is denoted as D, the included angle formed by the intersection of the extending wall of the part A of the elastic sleeve body 60 and the axis of the elastic sleeve body 60 is denoted as A1, the angle value range of the part A of the elastic sleeve body 60 before and after deformation can be 85-135 degrees, an included angle formed by the extending wall of the B part of the elastic sleeve body 60 intersecting with the axis of the elastic sleeve body 60 is B1, the range of angle values of the B part of the elastic sleeve body 60 before and after deformation may be 25-105 °, an included angle formed by the extending wall of the C part of the elastic sleeve body 60 intersecting with the cross section m may be C1, the range of angle values of the C part of the elastic sleeve body 60 before and after deformation may be 40-120 °, an included angle formed by the extending wall of the D part of the elastic sleeve body 60 intersecting with the cross section m may be D1, and the range of angle values of the D part of the elastic sleeve body 60 before and after deformation may be 30-110 °.

With continued reference to fig. 3, an important utility model in the present utility model is: the guide post 24 has an air guide section 240 formed axially hollow, and the outer peripheral wall of the guide post 24 is provided with a radially inward concave air inlet concave portion 241 at the root position of the guide post 24, the spray gun body 20 is further provided with an air guide channel 28, the air inlet of the air guide channel 28 is communicated with the air guide section 240, and the air outlet is positioned at the connecting portion 26 of the spray gun body 20. In order to allow the air guide passage 28 to communicate with the inner cavity of the container connected to the connection portion 26 of the gun body 20, the annular flange of the valve seat 51 is provided with a first hole 511 penetrating vertically, and the gasket 54 is provided with a second hole 540 penetrating vertically in a region corresponding to the first hole 511 of the valve seat 51. In this way, when the user presses the handle 30 to drive the piston 40 to reciprocate, the pressure in the liquid suction chamber 23 increases, and air can enter into the gap between the outer circumferential wall of the guide post 24 and the inner circumferential wall of the connecting sleeve 41 of the piston 40 through the air inlet concave portion 241 on the guide post 24 under the set pressure state, and then sequentially enter into the inner cavity of the container through the air guide section 240 of the guide post 24, the air guide channel 28, the first hole 511 of the valve seat 51 and the second hole 540 of the sealing gasket 54, particularly, the air in the liquid suction chamber 23 can be discharged out in time, so that the liquid in the container can be sucked in quickly and fills the liquid suction chamber 23, thereby ensuring the spraying effect at the spraying port 250 of the spray gun head, and effectively improving the spraying experience of the user.

The air intake recessed portions 241 on the guide post 24 in the liquid suction chamber 23 of the present embodiment have at least two (four air intake recessed portions 241 are shown in fig. 4), and the respective air intake recessed portions 241 are spaced apart in the circumferential direction of the guide post 24. Specifically, each of the air intake recesses 241 is provided adjacent to the root portion of the guide post 24, and each of the air intake recesses 241 is configured as a groove structure extending in the length direction of the guide post 24, whereby, in order to ensure continuous and stable discharge of air in the liquid suction chamber 23 through the above-described each air intake recess 241.

The present embodiment also relates to a sprayer, which includes a liquid container (not shown) and a spray gun head connected to the liquid container, where the spray gun head may employ the spray gun head described above, and when connected, the mouth of the liquid container may be correspondingly provided with external threads, so as to be connected with the connection cap 53 of the spray gun head.

Claims (10)

1. A spray gun head comprising:

a spray gun body (20) having a liquid suction chamber (23), a liquid outlet channel (25) and a spray port (250) communicating with the liquid outlet channel (25), wherein the spray gun body (20) is also provided with a connecting part (26) for connecting with an external container;

the liquid sucking and supplying device comprises a pressing handle (30) and a piston (40) movably arranged in the liquid sucking chamber (23), wherein the piston (40) is driven by the pressing handle (30) to suck external liquid into the liquid sucking chamber and apply pressure to the liquid sucked into the liquid sucking chamber to press the liquid sucked into the liquid outlet channel (25);

the method is characterized in that: the liquid suction chamber (23) is provided with a guide column (24) which extends towards the piston (40) and has the extending direction consistent with the moving direction of the piston (40), the piston (40) is provided with a guide hole (410) for the guide column (24) to slide and extend into, the guide column (24) is provided with an air guide section (240) which is axially hollow, the spray gun body (20) is also provided with an air guide channel (28) which is communicated with the air guide section (240), an air outlet of the air guide channel (28) is positioned at a connecting part (26) of the spray gun body (20) and can be communicated with an inner cavity of a container connected to the connecting part (26) of the spray gun body (20), the outer circumferential wall of the guide column (24) is provided with an air inlet concave part (241) which is radially concave, and air in the liquid suction chamber (23) can enter the air guide section (24) between the outer circumferential wall of the guide column (24) and the inner circumferential wall of the guide hole through the air guide concave part (241) under the set pressure state.

2. The spray gun head according to claim 1, wherein: the air inlet concave part (241) on the guide post (24) is arranged adjacent to the root part of the guide post (24) and is configured as a section of groove structure extending along the length direction of the guide post (24).

3. The spray gun head according to claim 2, wherein: the air intake concave portions (241) have at least two, and each air intake concave portion (241) is distributed at intervals along the circumferential direction of the guide post (24).

4. The spray gun head according to claim 1, wherein: one end of the piston (40) facing the guide column (24) is provided with an axially extending connecting sleeve (41), the connecting sleeve (41) is axially hollow to form the guide pore canal (410), and the port of the guide pore canal (410) is a necking structure (411) with the caliber reduced relative to the main body part of the guide pore canal (410).

5. The spray gun head according to claim 1, wherein: the spray gun is characterized in that the spray gun body (20) is also provided with a liquid inlet flow passage (27) communicated with the liquid suction chamber (23), a liquid inlet (270) of the liquid inlet flow passage (27) is positioned at a connecting part (26) of the spray gun body (20), and a one-way valve assembly for allowing liquid in an external container to enter the liquid inlet flow passage (27) in a one-way is further arranged at the liquid inlet (270) of the liquid inlet flow passage (27).

6. The spray gun head according to claim 5, wherein: the one-way valve assembly comprises a valve seat (51) with a through hole (510) extending vertically and a wave bead (50) movably matched with the port of the through hole (510) of the valve seat (51), wherein the wave bead (50) can open the port of the through hole (510) of the valve seat (51) when the liquid suction chamber (23) is in a negative pressure state and can seal the port of the through hole (510) of the valve seat (51) when the pressure in the liquid suction chamber (23) is larger than a set pressure state.

7. The spray gun head according to claim 6, wherein: the valve seat (51) is propped against a liquid inlet (270) of the liquid inlet flow channel (27) through a blank cap (52) arranged at a connecting part (26) of the spray gun body (20), and the valve seat further comprises a connecting cap (53) which is rotationally connected at the connecting part (26) of the spray gun body (20) and is used for being in threaded connection with the mouth part of an external container, and a sealing gasket (54) which is propped against the blank cap (52) is arranged in the connecting cap (53).

8. A spray gun head according to any one of claims 1 to 7, comprising:

a pressing handle (30) rotatably connected to the spray gun body (20) and connected to the piston (40) through an inwardly extending connecting arm (31), the pressing handle (30) being capable of being deflected by an external force between a first position retracted relative to the spray gun body (20) and a second position remote from the spray gun body (20);

and an elastic member provided on the spray gun body (20) and acting on the pressing handle (30), the elastic member always having a tendency to move toward the second position until the pressing handle (30).

9. The spray gun head according to claim 8, wherein: the spray gun body (20) is integrally L-shaped and comprises a transverse part (21) used for arranging the liquid outlet channel (25) and the injection port (250) and a vertical part (22) used as the connecting part (26), the spray gun body (20) is arranged at the position where the transverse part (21) is connected with the vertical part (22) to form the liquid suction cavity (23), the whole peripheral wall of the liquid suction cavity (23) is cylindrical and extends obliquely from top to bottom towards the side where the injection port (250) is arranged, the elastic piece is an elastic sleeve body (60) sleeved on the periphery of the liquid suction cavity, two elastic support arms (61) which are arranged at intervals and extend towards the position where the pressing handle (30) is arranged and are connected at the tail end, the two elastic support arms (61) on the elastic sleeve body (60) are arranged at intervals to form a first yielding gap (62) for enabling the part of the transverse part (21) to be connected with the liquid suction cavity (23) to be embedded in, and the elastic sleeve body (60) is sleeved on the periphery of the elastic sleeve body, and the elastic sleeve body (60) is provided with two elastic support arms (61) which are arranged at intervals, and the first yielding gap (62) is embedded in the first yielding gap (23) to be embedded in the position where the first yielding gap (23) is opposite to the first yielding gap (23).

10. A sprayer comprising a liquid container and a spray gun head connected to the liquid container, wherein the spray gun head is a spray gun head according to any one of claims 1 to 9.