A spray gun with continuous pressure function

Abstract

The present invention relates to a spray gun with a continuous pressure function, comprising: a spray gun body, having a liquid outlet channel and a spray port connected to the liquid outlet channel; a liquid suction and supply device, which is arranged on the spray gun body and defines a liquid suction chamber together with the spray gun body; a continuous pressure component, comprising: a liquid separation head, which defines a liquid inlet chamber and a liquid spray chamber that are independent of each other in the liquid outlet channel, and the liquid separation head has a continuous pressure chamber, a liquid inlet and a valve port; a liquid separation rod, which is movably arranged in the continuous pressure chamber and has a first state of opening the valve port and a second state of closing the valve port; an elastic member, which acts on the liquid separation rod, so that the liquid separation rod always has a tendency to move toward the valve port and close the valve port. The elastic member and the liquid separation rod of the continuous pressure component are both arranged in the continuous pressure chamber of the liquid separation head, thereby forming a modular unit component that is convenient for assembly and disassembly, which effectively simplifies the structure of the continuous pressure component and improves the assembly efficiency of the spray gun product.

Description

Technical Field

[0001] The invention relates to the technical field of liquid spraying devices, in particular to a spray gun with a continuous pressure function. Background Art

[0002] The existing spray guns usually have a one-way valve in the liquid inlet channel. When the liquid is inlet, the suction plug expands to enlarge the liquid inlet cavity to generate negative pressure, and then the liquid inlet channel generates negative pressure through the connecting port between the liquid inlet cavity and the liquid inlet channel, and then the one-way valve is opened to allow the liquid to enter the liquid inlet channel and then enter the liquid inlet cavity through the connecting port. Due to the negative pressure generated in the liquid inlet cavity, it is necessary to generate negative pressure in the liquid inlet channel through the connecting port, open the one-way valve and allow the liquid to enter through the pressure difference between the liquid inlet channel and the suction tube; when the trigger is pulled, the liquid in the liquid inlet cavity flows into the liquid inlet channel through the connecting port, the liquid pressure in the liquid inlet channel increases, the one-way valve is closed, and the liquid is sprayed out from the nozzle. However, the automatic sealing effect of the existing spray gun when the liquid is added is poor, and the liquid cannot be cut off instantly, resulting in air reflux, and the sprayed mist effect is poor and the droplets are large.

[0003] To this end, the Chinese invention patent application with application number CN202011555338.5 (publication number CN112657707A) discloses "A pressure storage continuous jet pistol pump", which is provided with a liquid storage one-way valve between the liquid inlet chamber and the liquid storage chamber, which can open and connect the two when the trigger is pulled, and a longitudinal one-way valve for allowing liquid to flow from the liquid storage chamber to the liquid outlet channel is provided in the liquid outlet channel, and a piston and a spring for pressing the piston to press the solution in the liquid storage chamber into the liquid outlet channel are provided in the liquid storage chamber. Among them, when the trigger is squeezed and the trigger rebounds, a negative pressure is generated in the liquid inlet chamber, and the liquid in the bottle is sucked into the liquid inlet chamber through the straw and the liquid inlet channel. When the trigger is pressed, the lateral one-way valve is closed, the liquid storage one-way valve is opened, and the liquid in the liquid inlet chamber is pressed into the liquid storage chamber. At the same time, the liquid entering the liquid storage chamber presses the piston down, compressing the spring to store liquid and pressure. When the pressure in the liquid storage chamber reaches a certain value, the liquid rushes open the longitudinal one-way valve to form a channel, and the liquid enters the liquid outlet channel and is sprayed out through the spray channel and the nozzle. The pressure in the liquid storage chamber decreases as the liquid is continuously sprayed out. When the pressure of the liquid on the piston is less than the elastic force of the spring, the spring pushes the piston to slowly bounce up and continue to spray during the rebound process.

[0004] Although the spray gun in the above patent can realize the continuous pressure function and achieve the purpose of spraying, the structure of the continuous pressure component used to realize the spraying is relatively complex, and needs to be coordinated through components such as a piston, a spring, and a longitudinal one-way valve. The above components are all separate separate components, which makes the assembly process of the product more cumbersome. In particular, the longitudinal one-way valve, the piston, and the spring are respectively arranged at different positions in the liquid storage chamber, which also causes the product itself to be larger in size to a certain extent.

[0005] Therefore, the existing spray gun with continuous pressure function still needs further improvement. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a spray gun with a continuous pressure function which can effectively simplify the structure of the continuous pressure component and is easy to assemble in view of the current status of the prior art.

[0007] The technical solution adopted by the present invention to solve the above technical problems is: a spray gun with a continuous pressure function, comprising:

[0008] The spray gun body has a liquid outlet channel and a spray port connected to the liquid outlet channel;

[0009] A liquid suction and supply device is provided on the spray gun body and defines a liquid suction cavity together with the spray gun body, and is used to suck external liquid into the liquid suction cavity and apply pressure to the liquid sucked into the liquid suction cavity to press it into the liquid outlet channel;

[0010] Also included is a continuous pressure assembly, which includes:

[0011] A liquid separation head is arranged in the liquid outlet channel, and defines a liquid inlet chamber and a liquid spray chamber which are independent of each other in the liquid outlet channel, wherein the liquid inlet chamber is connected with the liquid suction chamber, and the liquid spray chamber is connected with the spray port, and the liquid separation head has a continuous pressure chamber, a liquid inlet and a valve port, wherein the liquid inlet is connected with the liquid inlet chamber and the continuous pressure chamber, and the valve port is connected with the continuous pressure chamber and the liquid spray chamber;

[0012] A liquid-separating rod having a sealing portion in sealing contact with the inner wall surface of the pressure-continuing chamber, the liquid-separating rod being movably disposed in the pressure-continuing chamber and having a first state of opening the valve port and a second state of closing the valve port;

[0013] The elastic member is arranged in the continuous pressure chamber and acts on the liquid separation rod, so that the liquid separation rod always has a tendency to move toward the valve port to close the valve port.

[0014] In order to facilitate assembly and simplify the structure of the continuous pressure assembly, the elastic member is a spring, and the spring and the liquid separation rod are designed as one body.

[0015] In order to further facilitate assembly, simplify the structure of the continuous pressure assembly, reduce production costs and ensure the stability of the liquid injection process, the spring includes at least two spring arms that are arranged in a spiral shape, and the first end of each spring arm is connected to the liquid separation rod, and the second end is connected to a positioning seat for abutting against the inner wall of the continuous pressure chamber. The positioning seat, spring and liquid separation rod are designed as an integrated whole.

[0016] In order to ensure the stability of the reciprocating movement of the liquid dispensing rod and avoid the problem of swinging or jamming of the spring, the positioning seat is provided with a positioning hole, and the inner wall of the continuous pressure chamber is provided with a positioning column that can be correspondingly inserted into the positioning hole.

[0017] In order to ensure good sealing contact between the liquid-separating rod and the inner wall of the continuous pressure chamber and avoid leakage in the contact area between the two, the liquid-separating rod is columnar as a whole and has a front end adjacent to the valve port and a rear end away from the valve port. The sealing portion is a sealing sheet extending radially outward from the outer peripheral wall of the liquid-separating rod and tilted toward the position of its front end along its axial direction. When the liquid is pressed into the continuous pressure chamber, the liquid acts on the above-mentioned inclined sealing sheet, which can make the sealing sheet have a tendency to expand radially outward, thereby increasing the force between the sealing sheet and the inner wall of the continuous pressure chamber, ensuring the sealing of the contact position between the two and preventing leakage.

[0018] In order to ensure the sealing between the liquid-separating rod and the valve port, the valve port has an inner conical surface with a larger rear portion and a smaller front portion, and the front end of the liquid-separating rod has an arc surface structure that can seal with the inner conical surface of the valve port, and the front end of the liquid-separating rod also has a guide column extending forward, and the liquid-separating head also has a guide channel for the guide column to extend into at a position corresponding to the guide column.

[0019] In order to facilitate the assembly of the elastic member and the liquid dispensing rod, the liquid dispensing head includes a liquid dispensing head body and a cover body. The liquid dispensing head body is generally columnar and has an inner cavity open at the rear end. The cover body is detachably connected to the rear end opening of the liquid dispensing head body and together with the liquid dispensing head body defines the continuous pressure cavity. The elastic member abuts against the cover body.

[0020] In order to assemble the follow-up pressure assembly into the liquid outlet channel and ensure its reliability after assembly, the liquid outlet channel constructs an installation cavity for installing the liquid dispensing head adjacent to the injection port, and the inner wall surface of the installation cavity has a first limit step and a second limit step arranged at intervals along its length direction, the liquid dispensing head body has a shoulder protruding radially outward, the shoulder divides the liquid dispensing head into a front section located at the front and a rear section located at the rear, the shoulder of the liquid dispensing head abuts against the first limit step and is in sealing contact, the second limit step has support ribs extending forward and arranged at intervals in the circumferential direction of the installation cavity, the rear end of the liquid dispensing head abuts against the support ribs, the head of the spray gun body is also provided with a head cap, which abuts against the front end of the liquid dispensing head, a flow gap is provided between the outer circumferential wall of the front section of the liquid dispensing head and the inner circumferential wall of the installation cavity as the liquid inlet cavity, and a flow gap is provided between the outer circumferential wall of the rear section of the liquid dispensing head and the inner circumferential wall of the installation cavity as the liquid spray cavity.

[0021] In order to ensure that the liquid can flow in and out of the continuous pressure chamber evenly and smoothly, the liquid inlet includes a first opening arranged at circumferential intervals along the rear section of the liquid dispensing head, and the front section of the liquid dispensing head has a second opening arranged at circumferential intervals and connected to the valve port as a liquid outlet.

[0022] Since the liquid separation rod adopts a spring structure and gas is inevitably mixed in during the liquid supply process, when the gas flow rate is large, each liquid injection operation requires sufficient pressure to drive the liquid separation rod to retreat and open the valve port, which causes the problem that the liquid is difficult to spray or the spraying is delayed. Therefore, the liquid suction and supply device includes:

[0023] An exhaust pipe is provided on the spray gun body and extends into the liquid suction cavity. The exhaust pipe is hollow inside, thereby defining an exhaust passage communicating with the inner space of the bottle body connected to the spray gun body;

[0024] A piston member 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 portion of the piston member in contact with the exhaust pipe is an elastic sealing portion that can be deformed when the gas in the liquid suction chamber reaches a predetermined pressure. When the elastic sealing portion is in a deformed state, a flow gap is defined between the elastic sealing portion and the outer wall surface of the exhaust pipe for the gas in the liquid suction chamber to be discharged into the exhaust channel.

[0025] A wrench part is hinged on the spray gun body and connected to the piston member, so as to drive the piston member to move in the liquid suction chamber;

[0026] A one-way valve assembly is provided in the liquid outlet channel and allows liquid to enter the liquid outlet channel from the outside in one direction;

[0027] A liquid outlet is also provided between the liquid suction cavity and the liquid outlet channel.

[0028] Compared with the prior art, the advantages of the present invention are as follows: the elastic member and the liquid separation rod of the continuous pressure assembly are both arranged in the continuous pressure chamber of the liquid separation head, thereby forming a modular unit component that is convenient for assembly and disassembly. This structural design effectively simplifies the structure of the continuous pressure assembly and improves the assembly efficiency of the spray gun product. In the preferred embodiment, the elastic member and the liquid separation rod are designed as an integral whole, which further simplifies the structure of the continuous pressure assembly and ensures the stability of the reciprocating movement of the liquid separation rod. During the process of liquid suction and liquid supply, the liquid separation rod of the continuous pressure assembly is automatically closed under the action of the elastic member, preventing air from flowing back, achieving the purpose of instant sealing and instant liquid cutting, and its sealing performance and explosive force of injection are stronger, avoiding the occurrence of dripping. When the liquid enters the continuous pressure chamber through the liquid inlet, the liquid separation rod compresses the elastic member under the action of the liquid pressure, and keeps the elastic member in a compressed state. When the injection process is close to the end, the liquid separation rod is reset by the elastic force of the elastic member to push out the liquid to generate continuous pressure, and then produces spray through the injection port under strong pressure and high speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the three-dimensional structure of an embodiment of the present invention;

[0030] Figure 2 for Figure 1 Exploded diagram of

[0031] Figure 3 for Figure 2 The exploded view after further decomposition of the continuous pressure assembly;

[0032] Figure 4 is a cross-sectional view of an embodiment of the present invention (the valve port is in a closed state);

[0033] Figure 5 is a cross-sectional view of an embodiment of the present invention (the valve port is in an open state);

[0034] Figure 6 for Figure 5 The cross-sectional view after the continuous pressure assembly is omitted;

[0035] Figure 7 It is a schematic diagram of the three-dimensional structure of an integrated component composed of a positioning seat, an elastic member and a liquid dispensing rod according to an embodiment of the present invention;

[0036] Figure 8 It is a schematic diagram of the three-dimensional structure of the integrated component formed by the positioning seat, the elastic member and the liquid dispensing rod according to an embodiment of the present invention from another angle;

[0037] Fig. 9 Schematic diagram of the three-dimensional structure of the liquid dispensing head body according to an embodiment of the present invention. DETAILED DESCRIPTION

[0038] The present invention is further described in detail below with reference to the accompanying drawings.

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Since the embodiments disclosed in the present invention can be set in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features.

[0040] See also Figure 1-Figure 9 A spray gun with a continuous pressure function includes a spray gun body 10, a washing liquid supply device, a continuous pressure component and a connecting cap.

[0041] See also Figure 1 The spray gun body 10 is shaped like a pistol as a whole, and has a liquid outlet channel 11 inside. The head of the spray gun body 10 has a head cap 16, and the head cap 16 has a spray port 160, which can atomize the liquid sprayed therethrough. The bottom of the spray gun body 10 has a connecting cap 50, and the inner wall of the connecting cap 50 has threads, which can be used to connect with a bottle body (not shown) containing liquid. The bottom of the spray gun body 10 also has a blind cover 60, and the blind cover 60 has a liquid supply connector 61, and the liquid supply connector 61 is inserted into the entrance of the liquid outlet channel 11. The liquid supply connector 61 of the blind cover 60 is also connected to a liquid infusion tube 62, and the output tube 62 is led downward from the connecting cap 50 and can extend into the inner cavity of the bottle body.

[0042] Continue to see Figure 4 In this embodiment, a liquid through port 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 above-mentioned liquid through port 15 under the pressure of the piston, and is then supplied to the continuous pressure chamber 400 of the continuous pressure component and sprayed out from the injection port 160; after the user releases the wrench portion 32, the wrench portion 32 drives the piston to reset, and negative pressure is generated in the liquid suction chamber 14. The liquid in the bottle body can enter the liquid suction chamber 14 through the above-mentioned one-way valve component 33, the liquid outlet channel 11, and the liquid through port 15 in sequence.

[0043] Combination Figure 2 and Figure 3, the liquid outlet channel 11 is configured with an installation cavity 110 for installing a continuous pressure assembly adjacent to the injection port 160. The continuous pressure assembly includes a liquid dispensing head 40, a liquid dispensing rod 43, and an elastic member 44. Specifically, the liquid dispensing head 40 of this embodiment is columnar as a whole, and includes a liquid dispensing head body 41 and a cover body 42, wherein the liquid dispensing head 40 has an inner cavity open at the rear end, and the cover body 42 is detachably connected to the rear end open portion of the liquid dispensing head body 41, and the cover body 42 and the liquid dispensing head body 41 jointly define a continuous pressure cavity 400.

[0044] The cover 42 of this embodiment can be matched with the rear end opening of the liquid dispensing head body 41 by snapping.

[0045] See also Figure 6 The inner wall surface of the installation cavity 110 is provided with a first limiting step 111 and a second limiting step 112 arranged at intervals along the length direction thereof, and the outer peripheral wall of the liquid-dispensing head 40 is provided with a shoulder 410 protruding radially outward, and the shoulder 410 divides the liquid-dispensing head body 41 into a front section 411 located at the front and a rear section 412 located at the rear along the length direction thereof. The shoulder 410 of the liquid-dispensing head 40 abuts against the first limiting step 111 and is in sealing contact, so that the flow gap between the outer peripheral wall of the front section 411 of the liquid-dispensing head 40 and the inner peripheral wall of the installation cavity 110 forms a liquid inlet cavity 12, and the flow gap between the outer peripheral wall of the rear section 412 of the liquid-dispensing head 40 and the inner peripheral wall of the installation cavity 110 forms a liquid spray cavity 13.

[0046] 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 dispensing head 40 abuts against the support ribs 113. After the head cap 16 is connected to the head of the spray gun body 10, it can be pressed against the front end of the liquid dispensing head 40, pressing the liquid dispensing head 40 against the support ribs 113 along its axial direction, and at the same time, the shoulder 410 of the liquid dispensing head 40 also abuts against the first limiting step 111 and is in sealing contact.

[0047] The outer peripheral wall of the liquid-separating head 40 also has a liquid inlet, a liquid outlet and a valve port 415, wherein the rear section 412 of the liquid-separating head 40 is provided with first openings 413 spaced apart along the circumferential direction, and each first opening 413 constitutes a liquid inlet connected to the continuous pressure chamber 400. The front section of the liquid-separating head 40 is provided with second openings 414 spaced apart along the circumferential direction, and each second opening 414 constitutes a liquid outlet connected to the liquid spraying chamber 13. The valve port 415 of the liquid-separating head 40 is formed by contraction of the front section 411 of the continuous pressure chamber 400 in the radial direction. The continuous pressure chamber 400 sequentially connects the valve port 415 and the liquid outlet to the liquid spraying chamber 13.

[0048] The liquid dispensing rod 43 is also cylindrical, and is movably disposed in the continuous pressure chamber 400, and has a first state of opening the valve port 415 (see Figure 5) and a second state with the valve port 415 closed (see Figure 4 ). The valve port 415 of this embodiment has an inner conical surface 4150 with a larger rear portion and a smaller front portion. Correspondingly, the front end of the liquid separation rod 43 has an arc surface structure 432 that can be sealed with the inner conical surface 4150 of the valve port 415. The front end of the liquid separation rod 43 also has a guide column 433 extending forward, and the liquid separation head 40 also has a guide channel 416 for the guide column 433 to extend into at a position corresponding to the guide column 433.

[0049] See also Figure 7 and Figure 8 The outer peripheral wall of the liquid-separating rod 43 also has a sealing portion 431 in sealing contact with the inner wall of the continuous pressure chamber 400. The sealing portion 431 is a sealing sheet extending radially outward from the outer peripheral wall of the liquid-separating rod 43 and tilted toward the position of its front end along its axial direction. When the liquid is pressed into the continuous pressure chamber 400, when the liquid acts on the above-mentioned inclined sealing sheet, the sealing sheet has a tendency to expand radially outward, thereby increasing the force between the sealing sheet and the inner wall of the continuous pressure chamber 400, ensuring the sealing of the contact position between the two, and preventing leakage problems.

[0050] The elastic member 44 of this embodiment is arranged in the continuous pressure chamber 400, and is preferably a plastic spring. Among them, the elastic member 44 of this embodiment includes two spring arms 441 arranged in a spiral shape, the first ends of the two spring arms 441 are connected to the liquid separation rod 43, and the second ends are connected to the positioning seat 45, wherein the positioning seat 45 is used to abut against the support ribs 113 on the inner wall of the continuous pressure chamber 400. The inner wall of the cover body 42 of the liquid separation head 40 is also provided with a positioning column 421, and the positioning seat 45 is provided with a positioning hole 450. After the assembly process of the components of the continuous pressure assembly, the positioning column 421 on the cover body 42 is correspondingly inserted into the positioning hole 450 of the positioning seat 45, so as to realize the secure positioning of the elastic member 44 and the liquid separation rod 43, and avoid the problem of swinging or jamming of the liquid separation rod 43 during the reciprocating movement. Under the action of the elastic member 44, the liquid separation rod 43 always has a tendency to move toward the valve port 415 and close the valve port 415.

[0051] The elastic member 44 and the liquid separation rod 43 of the continuous pressure assembly of this embodiment are both arranged in the continuous pressure chamber 400 of the liquid separation head 40, thereby forming a modular unit component that is convenient for assembly and disassembly. This structural design effectively simplifies the structure of the continuous pressure assembly and improves the assembly efficiency of the spray gun product. In the preferred embodiment, the elastic member 44, the positioning seat 45 and the liquid separation rod 43 are designed as an integrated whole, which further simplifies the structure of the continuous pressure assembly and ensures the stability of the reciprocating movement of the liquid separation rod 43. Under the action of the liquid suction and liquid supply device, the liquid enters the continuous pressure chamber 400 through the liquid inlet. Under the action of the liquid pressure, the liquid separation rod 43 compresses the elastic member 44 and keeps the elastic member 44 in a compressed state. When the injection process is close to the end, the liquid separation rod 43 is reset by the elastic force of the elastic member 44 to push out the liquid to generate continuous pressure, and then produces a spray through the injection port 160 under strong pressure and high speed.

[0052] See also Figure 4 The liquid suction and supply device is arranged 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 includes a piston member 31, a wrench portion 32, and a one-way valve assembly 33, wherein the one-way valve assembly 33 can use a glass bead as a one-way valve core, and can be movably arranged at the port position of the liquid supply connector 61 of the cover 60, so as to realize a one-way flow of the liquid in the bottle body to the liquid outlet channel 11. Of course, it is conceivable that the one-way valve assembly 33 can also adopt various one-way valve structures in the prior art that can realize the one-way flow control of the liquid in the bottle body to the liquid outlet channel 11.

[0053] Another important invention point of the present embodiment is that the spray gun body 10 is also provided with an exhaust pipe 70 extending into the liquid suction chamber 14, and the exhaust pipe 70 is hollow inside, thereby defining an exhaust channel 71 that communicates with the internal 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 on the exhaust pipe 70 along the axial direction of the exhaust pipe 70, and 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, and the part of the piston member 31 that contacts the outer wall surface of the exhaust pipe 70 is an elastic sealing part 310 that can deform when the gas in the liquid suction chamber 14 reaches a predetermined pressure (the specific pressure value can be set according to the elastic force of the spring of the liquid dispensing rod), and when the elastic sealing part 310 is deformed, it can expand radially relative to the exhaust pipe 70, thereby defining a flow gap 700 between the elastic sealing part 310 and the outer wall surface of the exhaust pipe 70 for the gas in the liquid suction chamber 14 to be discharged into the exhaust channel 71. On the other hand, an exhaust groove 710 connected to the exhaust channel 71 of the exhaust pipe 70 is defined between the liquid supply connector 61 of the cover 60 and the inner wall of the liquid outlet channel 11 of the spray gun body 10. The exhaust groove 710 extends to the area corresponding to the bottle mouth of the cover 60. When the user operates the wrench part 32 to suck and supply liquid, when the gas in the suction chamber 14 is pressurized to reach the set pressure, it will enter the bottle body through the above-mentioned flow gap 700, the exhaust channel 71 and the exhaust groove 710 in sequence (the flow path is detailed in FIG. Figure 4 The gas in the liquid suction chamber 14 is effectively released, thereby avoiding the problem that the liquid separation rod is difficult to open due to a large amount of gas, thereby causing the liquid to be difficult to spray out or delay spraying out.

[0054] The piston member 31 of this embodiment is movably arranged in the liquid suction chamber 14 and is driven by a wrench part 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 head 312, and the inner side of the wrench part 32 has a ball socket, and the ball head 312 is constrained in the ball socket. The two can rotate and cooperate, thereby realizing stable sliding of the piston in the liquid suction chamber 14.

Claims

1. A spray gun with a continuous pressure function, comprising: A spray gun body (10) having a liquid outlet channel (11) and a spray port (160) connected to the liquid outlet channel (11); a liquid suction and supply device, which is disposed on the spray gun body (10) and defines a liquid suction chamber (14) together with the spray gun body (10), and is used to suck external liquid into the liquid suction chamber (14) and to apply pressure to the liquid sucked into the liquid suction chamber (14) so ​​as to press the liquid into the liquid outlet channel (11); It is characterized in that it also includes a continuous pressure component, which includes: A liquid separation head (40) is arranged in the liquid outlet channel (11), and defines a liquid inlet chamber (12) and a liquid spray chamber (13) which are independent of each other in the liquid outlet channel (11); the liquid inlet chamber (12) is connected to the liquid suction chamber (14), and the liquid spray chamber (13) is connected to the spray port (160); the liquid separation head (40) has a continuous pressure chamber (400), a liquid inlet, and a valve port (415); the liquid inlet is connected to the liquid inlet chamber (12) and the continuous pressure chamber (400), and the valve port (415) is connected to the continuous pressure chamber (400) and the liquid spray chamber (13); A liquid separation rod (43) having a sealing portion (431) in sealing contact with the inner wall surface of the continuous pressure chamber (400); the liquid separation rod (43) is movably arranged in the continuous pressure chamber (400) and has a first state of opening the valve port (415) and a second state of closing the valve port (415); An elastic member (44) is disposed in the continuous pressure chamber (400) and acts on the liquid separation rod (43), so that the liquid separation rod (43) always has a tendency to move toward the valve port (415) and close the valve port (415); The liquid-separating rod (43) is columnar in shape as a whole and has a front end adjacent to the valve port (415) and a rear end away from the valve port (415); the sealing portion (431) is a sealing sheet extending radially outward from the outer peripheral wall of the liquid-separating rod (43) and tilted along its axial direction toward the position of its front end; The liquid dispensing head (40) comprises a liquid dispensing head body (41) and a cover body (42); the liquid dispensing head body (41) is generally columnar and has an inner cavity which is open at the rear end; the cover body (42) is detachably connected to the rear end opening of the liquid dispensing head body (41) and defines the continuous pressure cavity (400) together with the liquid dispensing head body (41); the elastic member (44) abuts against the cover body (42); The liquid outlet channel (11) is configured with a mounting cavity (110) for mounting the liquid dispensing head (40) adjacent to the injection port (160); the inner wall surface of the mounting cavity (110) is provided with a first limiting step (111) and a second limiting step (112) arranged at intervals along its length direction; the liquid dispensing head body (41) is provided with a shoulder (410) protruding radially outward; the shoulder (410) divides the liquid dispensing head (40) into a front section (411) located at the front and a rear section (412) located at the rear; the shoulder (410) of the liquid dispensing head (40) abuts against the first limiting step (111) and is in sealing contact with the second limiting step (112); The spray gun body (10) is provided with a support rib (113) extending forward and arranged at intervals in the circumferential direction of the installation cavity (110), the rear end of the liquid-dispensing head (40) abuts against the support rib (113), the head of the spray gun body (10) is also provided with a head cap (16), the head cap (16) abuts against the front end of the liquid-dispensing head (40), a flow gap is provided between the outer peripheral wall of the front section (411) of the liquid-dispensing head (40) and the inner peripheral wall of the installation cavity (110) as the liquid inlet cavity (12), and a flow gap is provided between the outer peripheral wall of the rear section (412) of the liquid-dispensing head (40) and the inner peripheral wall of the installation cavity (110) as the liquid spray cavity (13); The liquid inlet includes first openings (413) arranged at intervals along the circumference of the rear section (412) of the liquid dispensing head (40), and the front section of the liquid dispensing head (40) has second openings (414) arranged at intervals along the circumference and connected to the valve port (415) as liquid outlets.

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

3. The spray gun with continuous pressure function according to claim 2, characterized in that: The spring comprises at least two spring arms (441) both arranged in a spiral shape, the first end of each spring arm (441) being connected to the liquid separation rod (43), and the second end being connected to a positioning seat (45) for abutting against the inner wall of the continuous pressure chamber (400), the positioning seat (45), the spring and the liquid separation rod (43) being designed as an integral 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 chamber (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 claim 1, characterized in that: The valve port (415) has an inner conical surface (4150) that is larger at the rear and smaller at the front. The front end of the liquid separation rod (43) has an arc surface structure (432) that can be sealed with the inner conical surface (4150) of the valve port (415). The front end of the liquid separation rod (43) also has a guide column (433) extending forward. The liquid separation head (40) also has a guide channel (416) at a position corresponding to the guide column (433) for the guide column (433) to extend into.

6. The spray gun with continuous pressure function according to any one of claims 1 to 4, characterized in that: The liquid suction and supply device comprises: An exhaust pipe (70) is provided on the spray gun body (10) and extends into the liquid suction chamber (14); the exhaust pipe (70) is hollow inside, thereby defining an exhaust passage (71) communicating with the internal space of a bottle body connected to the spray gun body (10); A piston member (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 portion of the piston member (31) in contact with 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; and a flow gap (700) is defined between the elastic sealing portion (310) and the outer wall surface of the exhaust pipe (70) in the deformed state for the gas in the liquid suction chamber (14) to be discharged into the exhaust channel (71); A wrench portion (32) is hinged on the spray gun body (10) and connected to the piston member (31), so as to drive the piston member (31) to move in the liquid suction chamber (14); A one-way valve assembly (33) is disposed in the liquid outlet channel (11) and allows liquid to enter the liquid outlet channel (11) from the outside in one direction; A liquid passage (15) is also provided between the liquid suction cavity (14) and the liquid outlet channel (11).

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