All-plastic trigger sprayer

Abstract

An all-plastic trigger sprayer, comprising a shroud (1). The shroud (1) is connected to a sprayer body (7), the front end of the sprayer body (7) is connected to a nozzle cap (2), the nozzle cap (2) is connected to a water distribution head body (9), the water distribution head body (9) is inserted into the sprayer body (7), the sprayer body (7) is hingedly connected to a trigger (3), the trigger (3) is connected to a piston (4), the piston (4) is slidably connected to a negative pressure column of the sprayer body (7), a plastic spring (8) is arranged at the upper end of the negative pressure column, the plastic spring (8) is sleeved outside the sprayer body (7), the bottom end of the sprayer body (7) is connected to a blank cap (10), the blank cap (10) is connected to a closure (6), a penetrating dip tube (11) is inserted into the blank cap (10), the dip tube (11) is connected to the sprayer body (7), a water outlet hole (701) is formed in the sprayer body (7) corresponding to the dip tube (11), and a glass ball (12) is arranged in the water outlet hole (701) inside the sprayer body (7). According to the all-plastic trigger sprayer, a plastic spring is used for supporting, so that the trigger sprayer can be integrally recycled, thereby avoiding using a metal spring to provide power, and also avoiding liquid contamination caused by liquid corrosion on the spring; and a lock piece is matched with a limiting groove, so that the nozzle cap has a locking function, and the nozzle cap is not prone to being rotated, thereby improving the safety.

Description

A full plastic spray gun Technical Field

[0001] The present invention relates to the technical field of spray guns, in particular to an all-plastic spray gun. Background Art

[0002] In daily life, spray guns are mainly used for cleaning and greening. They are a spray device that absorbs water or liquid in the bottle through a straw and sprays it out in the form of mist, straight line and foam.

[0003] Some existing bottle sprayers are basically powered by metal springs and use glass marbles as water separation devices, causing liquid to corrode the above two accessories, indirectly causing minor harm to the human body. It is not environmentally friendly and healthy to use, and it is difficult to recycle and cannot be reused. This spray gun does not have traditional metal springs and glass marbles. It adopts a full plastic structure design. The entire spray gun only has two materials and can be recycled as a whole. Although some current sprayers can achieve the continuous pressure function to achieve the purpose of spraying, the continuous pressure component structure used to achieve the spraying is relatively complex and requires the cooperation of components such as pistons, springs and longitudinal one-way valves. The above components are all separate components, making the product assembly process more cumbersome.

[0004] Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides an all-plastic spray gun, including a cover shell, the cover shell is connected to the gun body, the front end of the gun body is connected to the head cap, the head cap is connected to the water diversion head body, the water diversion head body is inserted into the gun body, the gun body is hinged to the trigger, the trigger is connected to the piston, the piston is slidably connected to the negative pressure column of the gun body, the upper end of the negative pressure column is provided with a plastic spring, the plastic spring is sleeved on the outside of the gun body, the bottom end of the gun body is connected to the blind cover, the blind cover is connected to the large circle, a through-pipe is inserted in the blind cover, the pipette is connected to the gun body, the gun body is provided with a water outlet corresponding to the pipette, and glass beads are provided in the water outlet inside the gun body.

[0006] Preferably, a limiting ring is provided on the upper end surface of the bottom of the gun body, the limiting ring is provided in a semicircular shape, and a buckle is provided on the side of the limiting ring on the gun body.

[0007] Preferably, a first slot is provided inside the trigger, the first slot is used to install a piston rod, the piston rod is connected to the piston, and a second slot is provided on the trigger above the first slot, the second slot is used to connect a plastic spring.

[0008] Preferably, a slot is provided on the inner wall of the top of the cover shell corresponding to the gun body, and a clamping block is provided on the inner wall of the bottom of the cover shell, and the clamping block is provided with an arc-shaped groove.

[0009] Preferably, a clamp is provided on the gun body, the clamp comprises a clamp and a support bar, the clamp is provided with an opening, and the side wall of the clamp is fixedly connected to the support bar.

[0010] Preferably, a flange is provided on the top of the large circle, the flange is annular, and a gasket is installed inside the large circle below the flange.

[0011] Preferably, the cover body and the rear end open position of the water diverter head body can be matched by snap fastening, and the water diverter head body and the spring water diverter rod are interference fit.

[0012] Preferably: the plastic spring includes a first support part and a second support part, an insert block is provided at the connection between the upper ends of the first support part and the second support part, the insert block is used to insert into the second slot, the bottom ends of the first support part and the second support part are connected to the bottom support part, and the bottom support part is provided with a groove.

[0013] Preferably, a locking piece is installed on the upper end surface of the connection between the cover shell and the head cap.

[0014] Preferably: a liquid inlet groove is provided on the inner wall of the head cap near the water outlet, a raised portion is provided at the edge of the end face where the head cap contacts the rib, there are four raised portions, the four raised portions are located at the corners of the head cap, and a limiting groove is provided between two adjacent raised portions.

[0015] The technical effects and advantages of the present invention are as follows:

[0016] 1. In the present invention, a plastic spring is used to play a supporting role, so that the spray gun can be recovered as a whole, avoiding the use of a metal spring as a power source and also avoiding the spring being corroded by liquid, causing liquid contamination.

[0017] 2. In the present invention, the trigger pushes the piston to compress water into the gun body. At this time, the glass beads in the cover droop and seal the cover to prevent water from flowing back. The liquid flows upward to the spring water diverter rod. The liquid pushes the spring water diverter rod to compress. The spring water diverter rod is reset by elastic force to push out the liquid to generate continued pressure, and mist is generated through the head cap under strong pressure and high speed.

[0018] 3. In the present invention, the spring water diverter rod is installed in the water diverter head body, and then the spring water diverter rod is fixed by the cover body, which has a simple structure and low installation cost.

[0019] 3. In the present invention, the locking member cooperates with the limiting groove, so that the head cap has a locking function, making it difficult for the head cap to rotate, thereby improving safety.

[0020] 4. In the present invention, the provided gasket and flange play a protective role on the bottle mouth, preventing the spray gun from hitting other objects during transportation, causing damage to the bottle mouth.

[0021] 5. In the present invention, the provided clip prevents the trigger from hitting other objects during transportation, which may cause leakage at the joint between the piston and the gun body. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG1 is a schematic structural diagram of a full-plastic spray gun provided in an embodiment of the present application;

[0023] FIG2 is an exploded view of an all-plastic spray gun provided in an embodiment of the present application;

[0024] FIG3 is a cross-sectional view of an all-plastic spray gun provided in an embodiment of the present application;

[0025] FIG4 is a schematic structural diagram of a middle cover of an all-plastic spray gun provided in an embodiment of the present application;

[0026] FIG5 is a schematic structural diagram of a clip in an all-plastic spray gun provided in an embodiment of the present application;

[0027] FIG6 is a schematic structural diagram of the large circle in the all-plastic spray gun provided in an embodiment of the present application;

[0028] FIG7 is a cross-sectional view of the large circle of the all-plastic spray gun provided in an embodiment of the present application;

[0029] FIG8 is a schematic structural diagram of the water diversion head body in the all-plastic spray gun provided in an embodiment of the present application;

[0030] FIG9 is a schematic structural diagram of the rear end of the water diversion head body in the all-plastic spray gun provided in an embodiment of the present application;

[0031] FIG10 is a schematic structural diagram of a spring water diversion rod in an all-plastic spray gun provided in an embodiment of the present application;

[0032] FIG11 is a schematic structural diagram of the rear end of the spring water diversion rod in the all-plastic spray gun provided in an embodiment of the present application;

[0033] FIG12 is a schematic structural diagram of a cover body in a fully plastic spray gun provided in an embodiment of the present application;

[0034] FIG13 is a front view of an all-plastic spray gun provided in an embodiment of the present application;

[0035] FIG14 is a schematic diagram of the structure of a plastic spring in an all-plastic spray gun provided in an embodiment of the present application;

[0036] FIG15 is a side view of a plastic spring in an all-plastic spray gun provided in an embodiment of the present application;

[0037] FIG16 is a schematic structural diagram of an all-plastic spray gun provided in another embodiment;

[0038] FIG17 is a schematic structural diagram of a cover of an all-plastic spray gun provided in another embodiment;

[0039] FIG18 is a schematic structural diagram of a head cap in an all-plastic spray gun provided in another embodiment.

[0040] In the figure: 1, cover; 101, slot; 102, block; 103, locking piece; 2, head cap; 201, liquid inlet groove; 202, raised part; 203, limit groove; 204, convex surface; 3, trigger; 301, first clamping groove; 302, second clamping groove; 4, piston; 401, piston rod; 5, clip; 501, clamp; 502, support bar; 6, large ring; 601, flange; 602, gasket; 7, gun body; 701, water outlet; 702, connecting hole; 703, buckle; 704, arc hole; 705, strip hole; 706, limit ring; 707, rib; 708, clamping strip; 709, Water inlet hole; 8. Plastic spring; 801. First support part; 802. Second support part; 803. Bottom support part; 804. Groove; 805. Insert; 806. First end face; 807. Second end face; 808. Third end face; 809. Fourth end face; 810. Fifth end face; 811. Boss; 9. Water diverter body; 91. Front section; 92. Back section; 93. First opening; 94. Second opening; 95. Shoulder; 96. Raised rib; 97. Continued pressure chamber; 10. Cover; 11. Straw; 12. Glass bead; 13. Cover body; 131. Positioning column; 14. Spring water diverter rod; 141. Positioning seat; 142. Sealing part; 143. Elastic arm; 144. Sealing ring; 145. Arc surface structure; 146. Guide column; 147. Positioning hole. DETAILED DESCRIPTION

[0041] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for purposes of illustration and description and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments are chosen and described to better illustrate the principles of the invention and its practical application, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for specific applications.

[0042] Please refer to Figures 1, 2 and 3. In this embodiment, a full-plastic spray gun is provided, including a cover shell 1, which is connected to a gun body 7. The front end of the gun body 7 is connected to a head cap 2, and the head cap 2 is connected to a water diverter body 9. The water diverter body 9 is inserted with a spring water diverter rod 14, and the spring water diverter rod 14 is inserted with a cover body 13. The water diverter body 9 is inserted into the gun body 7. The gun body 7 is hinged with a trigger 3, and the trigger 3 is connected to the piston 4. The piston 4 is slidably connected to the negative pressure column of the gun body 7. When a finger pulls the trigger 3, the piston 4 can move along the negative pressure column of the gun body 7. A plastic spring 8 is provided at the upper end of the negative pressure column. The plastic spring 8 is sleeved on the outside of the gun body 7. One end of the plastic spring 8 is connected to the trigger 3. The bottom end of the gun body 7 is connected to a stuffy cover 10, which is connected to the large circle 6. A through-hole is inserted in the stuffy cover 10. A suction pipe 11 is connected to the gun body 7. The gun body 7 is provided with a water outlet 701 corresponding to the suction pipe 11, and a glass bead 12 is provided inside the water outlet 701 of the gun body 7. The glass bead 12 is located at the upper end of the suction pipe 11. The bottom of the water outlet 701 is connected to the communicating hole 702, and the communicating hole 702 is connected to the negative pressure column. The gun body 7 is provided with a water inlet 709 below the communicating hole 702. A limiting ring 706 is provided on the upper end face of the bottom of the gun body 7. The limiting ring 706 is arranged in a semicircular shape. A buckle 703 is provided on the side of the limiting ring 706 of the gun body 7. The buckle 703 cooperates with the cover shell 1 to prevent the cover shell 1 from detaching from the buckle 703. The spring water diverter rod is installed in the water diverter head body, and then the spring water diverter rod is fixed by the cover body. The structure is simple and the installation cost is low.

[0043] Furthermore, a first slot 301 is provided on the inner side of the trigger 3, and the first slot 301 is used to install the piston rod 401, and the piston rod 401 is connected to the piston 4. A second slot 302 is provided on the trigger 3 above the first slot 301, and the second slot 302 is used to connect the plastic spring 8.

[0044] When the finger pulls the trigger 3, the plastic spring 8 is squeezed and deformed, and at the same time, the piston 4 is driven to enter the negative pressure column. When the trigger 3 is released, the plastic spring 8 is reset, pushing the trigger 3 to reset, and the liquid enters the negative pressure column through the straw 11 and the water inlet 709. When the trigger 3 is pressed, the piston 4 enters the negative pressure column, squeezing the liquid into the water outlet 701 from the connecting hole 702. At this time, the glass beads 12 in the blind cover 10 droop and seal the blind cover 10 to prevent the liquid from flowing back. The liquid flows upward to the position of the water diversion head body 9, and the liquid produces fine water channels and rotating water channels and is sprayed out through the head cap 2.

[0045] In this embodiment, referring to Figures 2 and 4, a slot 101 is provided on the inner wall of the top of the cover 1 corresponding to the gun body 7, and a block 102 is provided on the inner wall of the bottom of the cover 1. The block 102 is provided with an arc-shaped groove. The block 102 is inserted into the gap between the buckle 703 and the bottom of the gun body 7 to prevent displacement between the bottom of the cover 1 and the gun body 7. A clamping strip 708 is provided on the top of the gun body 7. The clamping strip 708 is inserted into the slot 101. A protrusion is provided at the end of the clamping strip 708. When the clamping strip 708 is inserted into the slot 101, the end of the clamping strip 708 is inserted into the end of the slot 101, and the protrusion fits into the end of the slot 101. At the same time, the inner wall of the arc-shaped groove at the clamping block 102 is tightly attached to the outer wall of the gun body 7, thereby realizing the installation of the cover 1 and the gun body 7 and preventing the gun body 7 from loosening.

[0046] In this embodiment, referring to Figure 5, a clip 5 is provided on the gun body 7, and the clip 5 includes a clamp 501 and a support bar 502. The clamp 501 is provided with an opening, and the side wall of the clamp 501 is fixedly connected to the support bar 502. The side section of the support bar 502 is an inverted T shape. During installation, one end of the support bar 502 is attached to the inner wall of the trigger 3, and the other end of the support bar 502 is attached to the outer wall of the gun body 7. The clamp 501 is clamped on the outside of the negative pressure column to prevent the trigger 3 from hitting other objects during transportation, causing leakage at the fitting point between the piston 4 and the gun body 7.

[0047] In this embodiment, referring to Figures 6 and 7, a flange 601 is provided on the top of the large circle 6. The flange 601 is annular and has an inverted cone shape. A gasket 602 is installed inside the large circle 6 below the flange 601. The gasket 602 is in the shape of a circular ring. After the large circle 6 is connected to the gun body 7, the upper end surface of the flange 601 is close to the bottom end of the gun body 7, which can prevent liquid leakage from the large circle 6. The gasket 602 and the flange 601 provide protection for the bottle mouth, preventing the spray gun from hitting other objects during transportation, causing damage to the bottle mouth.

[0048] In this embodiment, referring to Figures 8-12, the cover 13 and the rear end open position of the water diverter body 9 can be matched by snap fasteners, which can effectively isolate the liquid from entering the spring water diverter rod 14 to avoid affecting the continuous pressure function. The water diverter body 9 is cylindrical as a whole, and a continuous pressure chamber 97 is opened inside the water diverter body 9. The continuous pressure chamber 97 is used to insert the spring water diverter rod 14. The water diverter body 9 is located at the connection between the front section 91 and the rear section 92. A shoulder 95 is provided. The shoulder 95 divides the water diverter body 9 into a front section 9 located at the front along its length. 1 and the rear section 92 at the rear, the end of the front section 91 is provided with a diversion groove for gathering the liquid and spraying it out from the head cap 2, the front section 91 of the water diverter head body 9 is arranged with second openings 94 at intervals along the circumference, and each second opening 94 constitutes a liquid outlet connected to the water outlet hole 701, the rear section 92 of the water diverter head body 9 is arranged with first openings 93 at intervals along the circumference, and each first opening 93 constitutes a liquid inlet connected to the continuous pressure chamber 97, and the end of the rear section 92 is provided with a rib 96 for snap-fit ​​installation with the cover body 13.

[0049] Among them, the spring water diversion rod 14 includes a positioning seat 141, and the positioning seat 141 has a positioning hole 147. The cover 13 is provided with a positioning column 131 corresponding to the positioning hole 147. The positioning column 131 is inserted into the positioning hole 147. After the cover 13 is connected to the rib 96, the spring water diversion rod 14 is installed in the water diversion head body 9. One end of the positioning seat 141 is connected to the elastic arm 143, and the elastic arm 143 is hourglass-shaped. The other end of the elastic arm 143 is connected to the sealing portion 142. The outside of the sealing portion 142 A sealing ring 144 is provided at the edge, and the spring water diverter rod 14 is inserted into the continuous pressure chamber 97. The sealing ring 144 can play a sealing role. The front end of the sealing portion 142 is provided with a curved surface structure 145, and the curved surface structure 145 is tightly matched with the inner conical surface of the water diverter head body 9. The front end of the curved surface structure 145 also has a guide column 146 extending forward. The spring water diverter rod 14 is interference fit with the water diverter head body 9, which effectively isolates the liquid from entering the interior of the water diverter head body 9 to avoid affecting the continuous pressure function.

[0050] In this embodiment, as shown in FIG. 13 , an arc-shaped hole 704 and a strip-shaped hole 705 are provided at the opening of the water outlet 701 of the gun body 7 to facilitate the positioning and installation of the water diverter body 9 .

[0051] In this embodiment, referring to Figures 14 and 15, the plastic spring 8 includes a first support portion 801 and a second support portion 802. The upper end connection of the first support portion 801 and the second support portion 802 is provided with an insert block 805, and the insert block 805 is used to insert into the second slot 302. The bottom ends of the first support portion 801 and the second support portion 802 are connected to the bottom support portion 803. The bottom support portion 803 is provided with a groove 804. The groove 804 is used to be stuck on the outside of the gun body 7. The first support portion A first end face 806 is provided at the upper end of 801, a second end face 807 is provided at the lower end of the first support portion 801, a third end face 808 is provided on the outer wall of the second support portion 802, a fourth end face 809 is provided on the inner wall of the second support portion 802, a fifth end face 810 is provided at the upper end of the bottom support portion 803, and a boss 811 is provided on the inner side of the plastic spring 8, which is located on the inner side of the bottom support portion 803. The boss 811 is clamped on the limiting ring 706 to prevent the bottom of the plastic spring 8 from displacement.

[0052] Specifically, the angle between the first end face 806 and the fifth end face 810 is 5 degrees, and the deformation range of this angle is 45 degrees to 35 degrees. The angle between the second end face 807 and the fourth end face 809 is 109 degrees, and the deformation range of this angle is 60 degrees to 140 degrees. The angle between the third end face 808 and the fifth end face 810 is 95 degrees, and the deformation range of this angle is 45 degrees to 125 degrees. The angle between the fourth end face 809 and the fifth end face 810 is 73 degrees, and the deformation range of this angle is 20 degrees to 100 degrees.

[0053] By designing the angles of the plastic spring 8 , the angle at which the trigger 3 presses the plastic spring 8 to deform is 8 degrees ± 20 degrees. When the trigger 3 is pressed, the plastic spring 8 is easily deformed, and when the trigger 3 is released, the plastic spring 8 is easily reset.

[0054] In another embodiment, referring to Figures 16, 17 and 18, a locking piece 103 is installed on the upper end face of the connection between the cover shell 1 and the head cap 2, a rib 707 is provided on the outer wall of the gun body 7 near the locking piece 103, and an annular groove is provided on the inner wall of the head cap 2 corresponding to the rib 707, so that the head cap 2 can be rotatably connected to the gun body 7, a liquid inlet groove 201 is provided on the inner wall of the head cap 2 near the water outlet, a raised portion 202 is provided at the edge of the end face where the head cap 2 contacts the rib 707, four raised portions 202 are provided, and the four raised portions 202 are located at the corners of the head cap 2, a limiting groove 203 is provided between two adjacent raised portions 202, and a convex surface 204 is provided on the adjacent inner walls of the two raised portions 202, and the convex surface 204 cooperates with the rib 707.

[0055] In this embodiment, the locking member 103 locks the nozzle by limiting the rotation of the head cap 2. When unlocking, the upper end surface of the locking member 103 is pressed to disengage the locking member 103 from the head cap 2, and then the head cap 2 is rotated to open the nozzle. The locking member 103 is an elastic clamp, and the locking member 103 cooperates with the limiting groove 203, so that the head cap 2 has a locking function, making it difficult for the head cap 2 to be rotated, thereby improving safety.

[0056] The working principle of the present invention is:

[0057] In the present invention, the head cap 2 has a locking function, which makes the head cap 2 not easy to rotate, thereby improving safety. The plastic spring 8 is used to play a supporting role, so that the spray gun can be recovered as a whole, avoiding the use of a metal spring as power, and also avoiding the spring being corroded by the liquid, causing liquid contamination. The trigger pushes the piston to compress water into the gun body. At this time, the glass beads in the blind cover droop and seal the blind cover to prevent water from flowing back. The liquid flows upward to the spring water diverting rod, and the liquid pushes the spring water diverting rod to compress. The spring water diverting rod is reset by elastic force to push out the liquid to generate continued pressure, and mist is generated through the head cap under strong pressure and high speed.

[0058] Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without making creative efforts should fall within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described and explained in the present invention shall be implemented in accordance with conventional means in the field unless otherwise specified or limited.

Claims

1. A full plastic spray gun, comprising a housing (1), characterized in that: The cover shell (1) is connected to the gun body (7), the front end of the gun body (7) is connected to the head cap (2), the head cap (2) is connected to the water diversion head body (9), the water diversion head body (9) is inserted with a spring water diversion rod (14), the spring water diversion rod (14) is inserted with a cover body (13), the water diversion head body (9) is inserted into the gun body (7), the gun body (7) is hinged with a trigger (3), the trigger (3) is connected to a piston (4), the piston (4) is slidably connected to the negative pressure column of the gun body (7), and the negative pressure A plastic spring (8) is arranged at the upper end of the column, and the plastic spring (8) is sleeved on the outside of the gun body (7). The bottom end of the gun body (7) is connected to a cover (10), and the cover (10) is connected to the large circle (6). A penetrating straw (11) is inserted into the cover (10), and the straw (11) is connected to the gun body (7). The gun body (7) is provided with a water outlet (701) corresponding to the straw (11), and a glass bead (12) is arranged inside the water outlet (701) of the gun body (7).

2. The all-plastic spray gun according to claim 1, characterized in that: A limiting ring (706) is provided on the upper end surface of the bottom of the gun body (7), and the limiting ring (706) is arranged in a semicircular ring shape. A buckle (703) is provided on the side of the limiting ring (706) of the gun body (7).

3. The all-plastic spray gun according to claim 2, characterized in that: The trigger (3) is provided with a first slot (301) on the inner side thereof, the first slot (301) being used for installing a piston rod (401), the piston rod (401) being connected to the piston (4), and the trigger (3) is provided with a second slot (302) located above the first slot (301), the second slot (302) being used for connecting a plastic spring (8).

4. The all-plastic spray gun according to claim 3, characterized in that: The top inner wall of the cover shell (1) is provided with a slot (101) corresponding to the gun body (7), and the bottom inner wall of the cover shell (1) is provided with a clamping block (102), and the clamping block (102) is provided with an arc-shaped groove.

5. The all-plastic spray gun according to claim 1, characterized in that: The gun body (7) is provided with a clamp (5), and the clamp (5) comprises a clamp (501) and a support bar (502). The clamp (501) is provided with an opening, and the side wall of the clamp (501) is fixedly connected to the support bar (502).

6. The all-plastic spray gun according to claim 1, characterized in that: The top of the large circle (6) is provided with a flange (601), the flange (601) is annular, and a gasket (602) is installed inside the large circle (6) below the flange (601).

7. The all-plastic spray gun according to claim 1, characterized in that: The cover body (13) and the rear end open position of the water diverter head body (9) can be matched by snapping, and the water diverter head body (9) and the spring water diverter rod (14) are interference fit.

8. The all-plastic spray gun according to claim 1, characterized in that: The plastic spring (8) comprises a first support portion (801) and a second support portion (802); an insert block (805) is provided at the connection between the upper ends of the first support portion (801) and the second support portion (802); the insert block (805) is used to be inserted into the second slot (302); the bottom ends of the first support portion (801) and the second support portion (802) are connected to a bottom support portion (803); and the bottom support portion (803) is provided with a groove (804).

9. The all-plastic spray gun according to claim 1, characterized in that: A locking piece (103) is installed on the upper end surface of the connection between the cover shell (1) and the head cap (2).

10. The all-plastic spray gun according to claim 9, characterized in that: A liquid inlet groove (201) is arranged on the inner wall of the head cap (2) near the water outlet, and a raised portion (202) is arranged at the edge of the end surface where the head cap (2) contacts the convex rib (707). There are four raised portions (202), and the four raised portions (202) are located at the corners of the head cap (2). A limiting groove (203) is arranged between two adjacent raised portions (202).

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