CN216459522U - Spray gun with continuous pressure function - Google Patents

Abstract

The utility model relates to a spray gun with continuous pressure function, comprising: the spray gun body is provided with a liquid outlet channel and a spray opening communicated with the liquid outlet channel; the liquid suction and supply device is arranged on the spray gun body and defines a liquid suction cavity together with the spray gun body; continuous pressure subassembly includes: the liquid separation head is provided with a continuous pressure cavity, a liquid inlet and a valve port; the liquid separation rod is movably arranged in the continuous pressure cavity and has a first state of opening the valve port and a second state of closing the valve port; the elastic piece acts on the liquid separating rod, so that the liquid separating rod always has the tendency of moving towards the valve port to close the valve port. The elastic part and the liquid separating rod of the continuous pressure assembly are arranged in the continuous pressure cavity of the liquid separating head, so that a module unit component which is convenient to assemble and disassemble is formed, the structure of the continuous pressure assembly is effectively simplified, and the assembly efficiency of a spray gun product is improved.

Description

Spray gun with continuous pressure function

Technical Field

The utility model relates to the technical field of liquid spraying devices, in particular to a spray gun with a continuous pressure function.

Background

The existing spray gun is generally provided with a one-way valve in a liquid inlet channel, when liquid is fed, a suction plug is outwards stretched to enlarge a liquid guide cavity to generate negative pressure, then the liquid inlet channel generates negative pressure through a communicating port between the liquid guide cavity and the liquid inlet channel, and then the one-way valve is opened to enable liquid to enter the liquid inlet channel and then enter the liquid guide cavity through the communicating port, and due to the negative pressure generated by the liquid guide cavity, the liquid inlet channel generates negative pressure through the communicating port, the one-way valve is opened, and the liquid enters through the pressure difference between the liquid inlet channel and a suction pipe; when the trigger is pulled down, the liquid guide cavity flows into the liquid inlet channel through the communication port, the liquid pressure in the liquid inlet channel is increased, the check valve is closed, and the liquid is sprayed out from the spray head. However, the conventional spray gun has a poor automatic closing effect when liquid is supplied, cannot cut off the liquid instantaneously to cause air backflow, and has a poor atomization effect and large drops.

To this end, chinese patent application No. CN202011555338.5 (publication No. CN112657707A) discloses "a pressure accumulating type continuous spray pistol pump", in which a liquid accumulating check valve is disposed between a liquid guiding chamber and a liquid accumulating chamber, the liquid accumulating check valve can be opened to communicate the liquid guiding chamber and the liquid accumulating chamber when a trigger is pulled down, a longitudinal check valve is disposed in the liquid outlet channel to allow liquid to flow from the liquid accumulating chamber to the liquid outlet channel, a piston is disposed in the liquid accumulating chamber, and a spring is disposed in the liquid accumulating chamber to press the piston to press out the liquid in the liquid accumulating chamber to the liquid outlet channel. When the trigger is pulled, when the trigger rebounds, the liquid guide cavity generates negative pressure to suck liquid in the bottle into the liquid guide cavity through the suction pipe and the liquid inlet channel, when the trigger is pressed down, the lateral one-way valve is closed, the liquid storage one-way valve is opened, the liquid in the liquid guide cavity is pressed into the liquid storage cavity, meanwhile, the liquid entering the liquid storage cavity presses down the piston, the spring is compressed, liquid storage and pressure storage are carried out, when the pressure in the liquid storage cavity reaches a certain value, the liquid rushes out the longitudinal one-way valve to form a channel, the liquid enters the liquid outlet channel and is sprayed out through the liquid spraying channel and the nozzle, the pressure in the liquid storage cavity is reduced along with continuous spraying of the liquid, and when the pressure of the liquid on the piston is smaller than the elastic force of the spring, the spring pushes the piston to slowly bounce and continues to spray in the bouncing process.

Although the spray gun in the patent can realize continuing to press the function, reach the purpose of spraying, it is comparatively complicated to be used for realizing continuing to press subassembly structure of spraying, need form through parts such as piston, spring and vertical check valve cooperation, above-mentioned each part is solitary components of a whole that can function independently for the assembling process of product is comparatively loaded down with trivial details, and especially, vertical check valve sets up respectively in the different positions that hold the liquid chamber with piston, spring, has also caused the volume of product itself great to a certain extent.

Therefore, the existing spray gun with the pressure maintaining function needs to be further improved.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem of the prior art and provides a spray gun with a pressure maintaining function, which can effectively simplify the structure of a pressure maintaining component and is easy to assemble.

The technical scheme adopted by the utility model for solving the technical problems is as follows: a spray gun with continuous pressure function comprises:

the spray gun body is provided with a liquid outlet channel and a spray opening communicated with the liquid outlet channel;

the liquid suction and supply device is arranged on the spray gun body, defines a liquid suction cavity together with the spray gun body, and is used for sucking external liquid into the liquid suction cavity and applying pressure to the liquid sucked into the liquid suction cavity to press the liquid into the liquid outlet channel;

still include and continue to press the subassembly, should continue to press the subassembly to include:

the liquid separation head is arranged in the liquid outlet channel, a liquid inlet cavity and a liquid spraying cavity which are mutually independent are limited in the liquid outlet channel, the liquid inlet cavity is communicated with the liquid suction cavity, the liquid spraying cavity is communicated with the jet orifice, the liquid separation head is provided with a continuous pressure cavity, a liquid inlet and a valve port, the liquid inlet is communicated with the liquid inlet cavity and the continuous pressure cavity, and the valve port is communicated with the continuous pressure cavity and the liquid spraying cavity;

the liquid separating rod is provided with a sealing part which is in sealing contact with the inner wall surface of the continuous pressure cavity, is movably arranged in the continuous pressure cavity, and has a first state of opening the valve port and a second state of closing the valve port;

the elastic piece is arranged in the continuous pressure cavity and acts on the liquid separation rod, so that the liquid separation rod always has the tendency of moving towards the valve port to close the valve port.

In order to facilitate assembly and simplify the structure of the continuous pressing assembly, the elastic part is a spring, and the spring and the liquid separating rod are designed integrally.

In order to further facilitate assembly, simplify the structure of the continuous pressing assembly, reduce production cost and ensure stability of the liquid injection process, the spring comprises at least two elastic arms which are spirally arranged, a first end of each elastic arm is connected with the liquid dividing rod, a second end of each elastic arm is connected with a positioning seat which is used for abutting against the inner wall of the continuous pressing cavity, and the positioning seat, the spring and the liquid dividing rod are designed into a whole.

In order to ensure the stability of the reciprocating movement of the liquid separating rod and avoid the problem of swinging or blocking of the spring, the positioning seat is provided with a positioning hole, and the inner wall of the continuous pressure cavity is provided with a positioning column which can be correspondingly inserted into the positioning hole.

In order to ensure that the liquid separating rod is in good sealing contact with the inner wall surface of the continuous pressure cavity and avoid the leakage problem in the contact area of the liquid separating rod and the continuous pressure cavity, the whole liquid separating rod is columnar and is provided with a front end close to the valve port and a rear end far away from the valve port, and the sealing part is a sealing sheet which radially extends outwards from the peripheral wall of the liquid separating rod and inclines towards the position of the front end along the axial direction of the sealing sheet. After liquid is pressed into the continuous pressure cavity, when the liquid acts on the sealing sheet which is obliquely arranged, the sealing sheet has the tendency of radially expanding outwards, so that the acting force between the sealing sheet and the inner wall surface of the continuous pressure cavity can be increased, the sealing performance of the contact position of the sealing sheet and the continuous pressure cavity is ensured, and the leakage problem is avoided.

In order to ensure the sealing performance between the liquid separation rod and the valve port, the valve port is provided with an inner conical surface with a large rear part and a small front part, the front end of the liquid separation rod is provided with a cambered surface structure which can be in sealing fit with the inner conical surface of the valve port, the front end of the liquid separation rod is also provided with a guide column which extends forwards, and the liquid separation head is also provided with a guide pore canal into which the guide column extends at a part corresponding to the guide column.

In order to assemble the elastic piece and the liquid separating rod, the liquid separating head comprises a liquid separating head body and a cover body, the liquid separating head body is integrally columnar and is provided with an inner cavity with an opening at the rear end, the cover body is detachably connected to the opening at the rear end of the liquid separating head body and defines the continuous pressure cavity together with the liquid separating head body, and the elastic piece is abutted to the cover body.

In order to assemble the continuous pressing component into the liquid outlet channel and ensure the firmness of the assembled liquid outlet channel, a mounting cavity for mounting the liquid distribution head is constructed on the liquid outlet channel near the injection port, a first limiting step and a second limiting step which are arranged at intervals along the length direction of the mounting cavity are arranged on the inner wall surface of the mounting cavity, the liquid distribution head body is provided with a shoulder part which protrudes outwards in the radial direction, the shoulder part divides the liquid distribution head into a front section part which is positioned at the front part and a rear section part which is positioned at the rear part, the shoulder part of the liquid distribution head is abutted against the first limiting step and is in sealing contact with the first limiting step, the second limiting step is provided with a supporting rib which extends forwards and is arranged at intervals along the circumferential direction of the mounting cavity, the rear end of the liquid distribution head is abutted against the supporting rib, the head of the spray gun body is further provided with a head cap which is abutted against the front end of the liquid distribution head, an overflowing gap is arranged between the outer peripheral wall of the front section of the liquid separation head and the inner peripheral wall of the installation cavity and serves as the liquid inlet cavity, and an overflowing gap is arranged between the outer peripheral wall of the rear section of the liquid separation head and the inner peripheral wall of the installation cavity and serves as the liquid spraying cavity.

In order to ensure that the liquid can uniformly and smoothly enter and exit from the continuous pressure cavity, the liquid inlet comprises first openings which are circumferentially arranged at intervals along the rear section part of the liquid separation head, and the front section part of the liquid separation head is provided with second openings which are circumferentially arranged at intervals and communicated with the valve port as a liquid outlet.

Because the liquid separating rod adopts the spring structure to, supply the liquid in-process inevitably to mix into gas, when the gas flow wherein is great, the liquid injection operation needs sufficient pressure to drive liquid separating rod and retreat and open the valve port on every turn, has the difficult blowout or the problem of postponing blowout of liquid, for this reason, imbibition liquid supply device includes:

the exhaust pipe is arranged on the spray gun body and extends into the liquid suction cavity, and the exhaust pipe is hollow, so that an exhaust passage communicated with the inner space of the bottle body connected to the spray gun body in place is defined;

the piston piece is movably constrained on the exhaust pipe along the axial direction of the exhaust pipe and is in sealing contact with the outer wall surface of the exhaust pipe, the part of the piston piece, which is in contact with the exhaust pipe, is an elastic sealing part which can deform when the gas in the liquid suction cavity reaches a preset pressure state, and an overflowing gap for discharging the gas in the liquid suction cavity into the exhaust channel is defined between the elastic sealing part and the outer wall surface of the exhaust pipe when the elastic sealing part deforms;

the wrench part is hinged on the spray gun body and connected with the piston part, so that the piston part can be driven to move in the liquid suction cavity;

the check valve assembly is arranged in the liquid outlet channel and allows liquid to enter the liquid outlet channel from the outside in a one-way mode;

a liquid through port is also arranged between the liquid suction cavity and the liquid outlet channel.

Compared with the prior art, the utility model has the advantages that: the elastic part and the liquid separating rod of the continuous pressure assembly are arranged in the continuous pressure cavity of the liquid separating head, so that a module unit component which is convenient to assemble and disassemble is formed. In the preferred scheme, the elastic part and the liquid separating rod are designed into a whole, so that the structure of the continuous pressing assembly is further simplified, and the stability of the reciprocating movement of the liquid separating rod is ensured. In the liquid suction and supply process, the liquid distributing rod of the continuous pressure assembly is automatically sealed under the action of the elastic piece, air backflow is prevented, the purposes of instant sealing and instant liquid cutting are achieved, the sealing performance and the explosive force of spraying are stronger, and the phenomenon of liquid dropping is avoided. When liquid enters the pressure-sustaining cavity through the liquid inlet and is acted by the liquid pressure, the liquid-separating rod compresses the elastic part and keeps the elastic part in a compressed state, and when the injection process is nearly finished, the liquid-separating rod is reset through the elasticity of the elastic part to push out the liquid to generate pressure sustaining, so that the liquid is sprayed through the injection port under strong pressure and high speed.

Drawings

FIG. 1 is a schematic perspective view of an embodiment of the present invention;

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

FIG. 3 is an exploded view of the continuous compression assembly of FIG. 2, further exploded;

FIG. 4 is a cross-sectional view of an embodiment of the present invention (with the valve port in a closed state);

FIG. 5 is a cross-sectional view of an embodiment of the utility model (with the valve port in an open state);

FIG. 6 is a cross-sectional view of FIG. 5 with the hold-down assembly omitted;

FIG. 7 is a schematic perspective view of an integrated member formed by combining the positioning seat, the elastic member and the liquid separating rod according to the embodiment of the utility model;

FIG. 8 is a schematic perspective view of another angle of the integrated member formed by combining the positioning seat, the elastic member and the liquid separating rod according to the embodiment of the utility model;

fig. 9 is a schematic perspective view of a liquid separation head body according to an embodiment of the present invention.

Detailed Description

The utility model is described in further detail below with reference to the accompanying examples.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships illustrated in the drawings for the purposes of convenience in describing the utility model and to simplify the description, but are not intended to indicate or imply that the referenced devices or elements must be in a particular orientation, construction and operation, and that the disclosed embodiments of the utility model are arranged in different orientations, so that the directional terms are exemplary only and are not to be construed as limiting, e.g., "upper," "lower than," and the same, "" lower than, "etc., where the same, and the same than the like in the same than the other than the same than the other than the same in the same than the same in the same than in the same direction of the same, "lower" is not necessarily limited to a direction opposite to or coincident with the direction of gravity. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

Referring to fig. 1 to 9, a spray gun with a pressure sustaining function includes a spray gun body 10, a washing liquid supply device, a pressure sustaining assembly, and a connection cap.

Referring to fig. 1, the spray gun body 10 is formed in an overall pistol-like shape with a liquid outlet passage 11 formed therein. The head of the spray gun body 10 has a head cap 16, and the head cap 16 has an ejection port 160 for atomizing the liquid ejected therethrough. The bottom of the spray gun body 10 is provided with a coupling cap 50, and the inner wall of the coupling cap 50 is provided with screw threads for coupling with a bottle (not shown) containing liquid. The bottom of the spray gun body 10 is also provided with a blank cap 60, and the blank cap 60 is provided with a liquid supply connector 61, and the liquid supply connector 61 is inserted into the inlet of the liquid outlet channel 11. The feeding joint 61 of the blank cap 60 is also connected with a transfusion tube 62, and the output tube 62 is led out downwards from the connecting cap 50 and can extend into the inner cavity of the bottle body.

With continued reference to fig. 4, a liquid passage 15 is further provided between the liquid suction chamber 14 and the liquid outlet channel 11, when the user presses the wrench portion 32, the liquid in the liquid suction chamber 14 flows into the liquid outlet channel 11 through the liquid passage 15 under the pressing of the piston, and is further supplied to the continuous pressure chamber 400 of the continuous pressure assembly and is ejected from the ejection opening 160; after the user releases the trigger part 32, the trigger part 32 drives the piston to reset, negative pressure is generated in the liquid suction cavity 14, and liquid in the bottle body can enter the liquid suction cavity 14 through the one-way valve assembly 33, the liquid outlet channel 11 and the liquid through port 15 in sequence.

With reference to fig. 2 and 3, the outlet passage 11 is configured with a mounting cavity 110 adjacent to the jet port 160 for mounting the continuous compression assembly. The continuous pressing assembly comprises a liquid separation head 40, a liquid separation rod 43 and an elastic piece 44. Specifically, the liquid separation head 40 of the present embodiment is generally cylindrical, and includes a liquid separation head body 41 and a cover 42, wherein the liquid separation head 40 has an inner cavity with an opening at the rear end, the cover 42 is detachably connected to the opening at the rear end of the liquid separation head body 41, and the cover 42 and the liquid separation head body 41 together define a continuous pressure chamber 400.

The cover 42 of the present embodiment can be engaged with the opening position of the rear end of the liquid separation head body 41 by a snap.

Referring to fig. 6, the inner wall surface of the mounting cavity 110 has a first limit step 111 and a second limit step 112 spaced apart along the length direction thereof, and the outer peripheral wall of the liquid-separating head 40 has a radially outwardly projecting shoulder 410, and the shoulder 410 divides the liquid-separating head body 41 into a front section 411 at the front and a rear section 412 at the rear along the length direction thereof. The shoulder 410 of the liquid separation head 40 abuts against the first limiting step 111 and is in sealing contact with the first limiting step 111, so that an overflow gap between the outer peripheral wall of the front section 411 of the liquid separation head 40 and the inner peripheral wall of the mounting cavity 110 forms the liquid inlet cavity 12, and an overflow gap between the outer peripheral wall of the rear section 412 of the liquid separation head 40 and the inner peripheral wall of the mounting cavity 110 forms the liquid spray cavity 13.

The second limiting step 112 has support ribs 113 extending forward and arranged at intervals in the circumferential direction of the mounting cavity 110, and the rear end of the liquid separation head 40 abuts against the support ribs 113. The head cap 16 is connected to the front end of the spray gun body 10 and can press against the front end of the liquid separation head 40 to press the liquid separation head 40 against the support rib 113 along the axial direction, and meanwhile, the shoulder 410 of the liquid separation head 40 is also pressed against and in sealing contact with the first limit step 111.

The outer peripheral wall of the liquid separation head 40 further has a liquid inlet, a liquid outlet and a valve port 415, wherein the rear section 412 of the liquid separation head 40 is circumferentially provided with first openings 413 at intervals, and each first opening 413 forms a liquid inlet communicated with the continuous pressure chamber 400. The front part of the liquid separation head 40 is provided with second openings 414 at intervals along the circumferential direction, and each second opening 414 forms a liquid outlet communicated with the liquid spraying cavity 13. The valve port 415 of the liquid separation head 40 is formed by the continuous pressure chamber 400 thereof being contracted in the radial direction at the front section 411. The continuous pressure chamber 400 connects the valve port 415 and the liquid outlet with the liquid spraying chamber 13 in sequence.

The liquid-separating rod 43 is also cylindrical, and is movably disposed in the continuous-pressure chamber 400, and has a first state (see fig. 5 in detail) for opening the valve port 415 and a second state (see fig. 4 in detail) for closing the valve port 415. The valve port 415 of the present embodiment has an inner conical surface 4150 with a larger rear portion and a smaller front portion, and correspondingly, the front end of the liquid separation rod 43 has an arc surface structure 432 capable of being in sealing fit with the inner conical surface 4150 of the valve port 415. The front end of the liquid separation rod 43 is further provided with a guide post 433 extending forwards, and the liquid separation head 40 is further provided with a guide passage 416 at a position corresponding to the guide post 433, and the guide post 433 extends into the guide passage 416.

Referring to fig. 7 and 8, the outer peripheral wall of the liquid separation lever 43 further includes a seal portion 431 in sealing contact with the inner wall surface of the pressurizing chamber 400. The seal portion 431 is a seal piece that extends radially outward from the outer peripheral wall of the liquid separation rod 43 and is inclined in its axial direction to the position of the leading end thereof. After the liquid is pressed into the continuous pressure cavity 400, the liquid acts on the sealing sheet which is obliquely arranged, so that the sealing sheet has a tendency of radially expanding outwards, the acting force between the sealing sheet and the inner wall surface of the continuous pressure cavity 400 can be increased, the sealing performance of the contact position of the sealing sheet and the continuous pressure cavity 400 is ensured, and the leakage problem is avoided.

The elastic member 44 of the present embodiment is disposed in the continuous pressure chamber 400, and is preferably a plastic spring. The elastic member 44 of this embodiment includes two elastic arms 441 that are all spirally arranged, first ends of the two elastic arms 441 are all connected to the liquid separating rod 43, and second ends are connected to the positioning seat 45, wherein the positioning seat 45 is used for abutting against the supporting rib 113 on the inner wall of the continuous pressure cavity 400. The inner wall of the cover body 42 of the liquid separation head 40 is further provided with a positioning column 421, the positioning seat 45 is provided with a positioning hole 450, and after the assembly process of each component of the continuous pressing assembly, the positioning column 421 on the cover body 42 is correspondingly inserted into the positioning hole 450 of the positioning seat 45, so that the elastic piece 44 and the liquid separation rod 43 are firmly positioned, and the problem that the liquid separation rod 43 swings or is blocked in the reciprocating movement process is avoided. The elastic member 44 allows the liquid separation lever 43 to always move toward the valve port 415 to close the valve port 415.

The elastic part 44 and the liquid separating rod 43 of the continuous pressing assembly of the embodiment are arranged in the continuous pressing cavity 400 of the liquid separating head 40, so that a module unit component which is convenient to assemble and disassemble is formed, the structure design effectively simplifies the structure of the continuous pressing assembly, and the assembly efficiency of a spray gun product is improved. In a preferred scheme, the elastic member 44, the positioning seat 45 and the liquid separating rod 43 are integrally designed, so that the structure of the continuous pressing assembly is further simplified, and the stability of the reciprocating movement of the liquid separating rod 43 is ensured. Under the action of the liquid suction and supply device, liquid enters the pressure-sustaining chamber 400 through the liquid inlet, under the action of the liquid pressure, the liquid separation rod 43 compresses the elastic part 44 and keeps the elastic part 44 in a compressed state, when the spraying process is nearly finished, the liquid separation rod 43 is reset through the elastic force of the elastic part 44 to push out the liquid to generate continuous pressure, and then the liquid can be sprayed through the spraying opening 160 under strong pressure and high speed.

Referring to fig. 4, the liquid suction and supply device is disposed on the spray gun body 10 and defines a liquid suction chamber 14 together with the spray gun body 10. The liquid suction and supply device comprises a piston piece 31, a wrench part 32 and a one-way valve assembly 33, wherein the one-way valve assembly 33 can adopt glass beads as a one-way valve core and can be movably arranged at the port position of a liquid supply joint 61 of a blank cap 60, thereby realizing the unidirectional flow of liquid in the bottle body to the liquid outlet channel 11. Of course, it is contemplated that the check valve assembly 33 may be a check valve assembly of various types known in the art that can control the unidirectional flow of the liquid in the bottle body to the outlet channel 11.

Another important point of the present embodiment is that: the spray gun body 10 is also provided with an exhaust tube 70 extending into the liquid-intake chamber 14, the exhaust tube 70 being hollow inside so as to define an exhaust passage 71 communicating with the interior space of the bottle body connected in place on the spray gun body 10. Specifically, the piston member 31 of the present embodiment is movably constrained to the exhaust pipe 70 along the axial direction of the exhaust pipe 70, the piston member 31 has a mounting hole 311, the inner wall surface of the mounting hole 311 is in sealing contact with the outer wall surface of the exhaust pipe 70, the portion of the piston member 31 in contact with the outer wall surface of the exhaust pipe 70 is an elastic sealing portion 310 that can deform when the gas in the liquid suction chamber 14 reaches a predetermined pressure (a specific pressure value can be set according to the elastic force of the spring of the liquid separation rod), and the elastic sealing portion 310 can expand outward in the radial direction relative to the exhaust pipe 70 when the elastic sealing portion 310 deforms, so that an overflow gap 700 for discharging the gas in the liquid suction chamber 14 into the exhaust passage 71 is defined between the elastic sealing portion 310 and the outer wall surface of the exhaust pipe 70. On the other hand, an air discharge groove 710 communicated with the air discharge channel 71 of the air discharge pipe 70 is defined between the liquid supply connector 61 of the blank cap 60 and the inner wall of the liquid outlet channel 11 of the spray gun body 10, and the air discharge groove 710 extends to the position of the region of the blank cap 60 corresponding to the bottle mouth of the bottle body. When a user operates the wrench portion 32 to suck and supply liquid, when the gas in the liquid suction cavity 14 is pressurized to reach a set pressure, the gas passes through the flow passage gap 700, the exhaust channel 71 and the exhaust groove 710 to enter the bottle body (the flow path is shown by the dotted line and the arrow in fig. 4), so that the gas in the liquid suction cavity 14 is effectively released, and therefore, the problem that the liquid separating rod is difficult to open due to large gas amount, and further the liquid is difficult to spray or is difficult to delay to spray is avoided.

The piston member 31 of the present embodiment is movably disposed in the liquid suction chamber 14 and driven by a wrench portion 32 hinged on the spray gun body 10, specifically, the outer end of the piston has a connecting arm 311, the end of the connecting arm 311 has a ball 312, the inner side of the wrench portion 32 has a ball socket, the ball 312 is constrained in the ball socket, and the two can be rotatably matched, so as to realize stable sliding of the piston in the liquid suction chamber 14.

Claims (10)

1. A spray gun with a pressure sustaining function, comprising:

a spray gun body (10) having a liquid outlet passage (11) and a spray port (160) communicating with the liquid outlet passage (11);

the liquid suction and supply device is arranged on the spray gun body (10), defines a liquid suction cavity (14) together with the spray gun body (10), and is used for sucking external liquid into the liquid suction cavity (14) and applying pressure to the liquid sucked into the liquid suction cavity (14) so as to press the liquid into the liquid outlet channel (11);

the method is characterized in that: still include and continue to press the subassembly, should continue to press the subassembly to include:

the liquid separation head (40) is arranged in the liquid outlet channel (11), a liquid inlet cavity (12) and a liquid spraying cavity (13) which are independent of each other are defined in the liquid outlet channel (11), the liquid inlet cavity (12) is communicated with the liquid suction cavity (14), the liquid spraying cavity (13) is communicated with the injection port (160), the liquid separation head (40) is provided with a continuous pressure cavity (400), a liquid inlet and a valve port (415), the liquid inlet is communicated with the liquid inlet cavity (12) and the continuous pressure cavity (400), and the valve port (415) is communicated with the continuous pressure cavity (400) and the liquid spraying cavity (13);

the liquid separation rod (43) is provided with a sealing part (431) which is in sealing contact with the inner wall surface of the continuous pressure cavity (400), and the liquid separation rod (43) is movably arranged in the continuous pressure cavity (400) and has a first state of opening the valve port (415) and a second state of closing the valve port (415);

and the elastic piece (44) is arranged in the continuous pressure cavity (400) and acts on the liquid separation rod (43), so that the liquid separation rod (43) always has the tendency of moving towards the valve port (415) to close the valve port (415).

2. The spray gun with continuous pressure function according to claim 1, characterized in that: the elastic piece (44) is a spring, and the spring and the liquid separating rod (43) are designed into a whole.

3. The spray gun with continuous pressure function according to claim 2, characterized in that: the spring comprises at least two elastic arms (441) which are spirally arranged, the first end of each elastic arm (441) is connected with the liquid distribution rod (43), the second end of each elastic arm is connected with a positioning seat (45) which is used for abutting against the inner wall of the continuous pressure cavity (400), and the positioning seat (45), the spring and the liquid distribution rod (43) are designed into a whole.

4. The spray gun with continuous pressure function according to claim 3, characterized in that: the positioning seat (45) is provided with a positioning hole (450), and the inner wall of the continuous pressure cavity (400) is provided with a positioning column (421) which can be correspondingly inserted into the positioning hole (450).

5. The spray gun with continuous pressure function according to any one of claims 1-4, characterized in that: the liquid separating rod (43) is cylindrical overall and is provided with a front end adjacent to the valve port (415) and a rear end far away from the valve port (415), and the sealing part (431) is a sealing sheet which extends outwards from the outer peripheral wall of the liquid separating rod (43) in the radial direction and is inclined towards the position of the front end along the axial direction.

6. The spray gun with continuous pressure function according to claim 5, characterized in that: the valve port (415) is provided with an inner conical surface (4150) with a large rear part and a small front part, the front end of the liquid separation rod (43) is provided with an arc-shaped surface structure (432) which can be in sealing fit with the inner conical surface (4150) of the valve port (415), the front end of the liquid separation rod (43) is further provided with a guide column (433) extending forwards, and the liquid separation head (40) is further provided with a guide hole channel (416) into which the guide column (433) extends at a position corresponding to the guide column (433).

7. The spray gun with continuous pressure function according to any one of claims 1-4, characterized in that: divide liquid head (40) including dividing liquid head body (41) and lid (42), divide liquid head body (41) whole to be the column, and have the open inner chamber in rear end, lid (42) connect with can breaking down divide the rear end of liquid head body (41) to inject with this liquid head body (41) jointly and continue to press chamber (400), elastic component (44) with lid (42) offset.

8. The spray gun with continuous pressure function according to claim 7, characterized in that: the liquid outlet channel (11) is provided with a mounting cavity (110) for mounting the liquid separation head (40) at a position close to the jet orifice (160), the inner wall surface of the mounting cavity (110) is provided with a first limiting step (111) and a second limiting step (112) which are arranged at intervals along the length direction of the mounting cavity, the liquid separation head body (41) is provided with a shoulder part (410) which protrudes outwards in the radial direction, the shoulder part (410) divides the liquid separation head (40) into a front section part (411) which is positioned at the front part and a rear section part (412) which is positioned at the rear part, the shoulder part (410) of the liquid separation head (40) is abutted against the first limiting step (111) and is in sealing contact with the first limiting step, the second limiting step (112) is provided with support ribs (113) which extend forwards and are arranged at intervals in the circumferential direction of the mounting cavity (110), and the rear end of the liquid separation head (40) is abutted against the support ribs (113), the spray gun is characterized in that the head of the spray gun body (10) is further provided with a head cap (16), the head cap (16) is pressed against the front end of the liquid dividing head (40), an overflowing gap is formed between the outer peripheral wall of the front section part (411) of the liquid dividing head (40) and the inner peripheral wall of the mounting cavity (110) to serve as the liquid inlet cavity (12), and an overflowing gap is formed between the outer peripheral wall of the rear section part (412) of the liquid dividing head (40) and the inner peripheral wall of the mounting cavity (110) to serve as the liquid spraying cavity (13).

9. The spray gun with continuous pressure function according to claim 8, characterized in that: the liquid inlet comprises first openings (413) arranged at intervals along the circumferential direction of a rear section part (412) of the liquid separation head (40), and a front section part of the liquid separation head (40) is provided with second openings (414) arranged at intervals along the circumferential direction and communicated with the valve port (415) as liquid outlets.

10. The spray gun with continuous pressure function according to any one of claims 1-4, characterized in that: the liquid suction and supply device comprises:

an exhaust pipe (70) provided on the spray gun body (10) and extending into the liquid suction chamber (14), the exhaust pipe (70) being hollow inside so as to define an exhaust passage (71) communicating with an inner space of a bottle body connected in place on the spray gun body (10);

the piston piece (31) is movably constrained on the exhaust pipe (70) along the axial direction of the exhaust pipe (70) and is in sealing contact with the outer wall surface of the exhaust pipe (70), the part of the piston piece (31) in contact with the exhaust pipe (70) is an elastic sealing part (310) which can deform under the condition that the gas in the liquid suction cavity (14) reaches a preset pressure, and an overflowing gap (700) for discharging the gas in the liquid suction cavity (14) into the exhaust channel (71) is defined between the elastic sealing part (310) and the outer wall surface of the exhaust pipe (70) under the deformation condition;

a wrench part (32) hinged on the spray gun body (10) and connected with the piston part (31) so as to drive the piston part (31) to move in the liquid suction cavity (14);

a one-way valve assembly (33) which is arranged in the liquid outlet channel (11) and allows liquid to enter the liquid outlet channel (11) from the outside in a one-way;

a liquid through port (15) is also arranged between the liquid suction cavity (14) and the liquid outlet channel (11).

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