Airless high-pressure sprayer

Abstract

The utility model discloses an airless high-pressure sprayer which comprises a plunger pump, and the plunger pump comprises a driving assembly, a swash plate assembly and a pump body. A feeding channel and a discharging channel are arranged in the pump body, and a piston assembly is arranged between the feeding channel and the discharging channel. The swash plate assembly is connected between the pump main body and the driving assembly, and a swash plate of the swash plate assembly is rotationally mounted in the swash plate assembly; the driving assembly is used for driving the swash plate to rotate; the swash plate is connected with the piston assembly; when the swash plate rotates, the swash plate can drive the piston assembly to move back and forth in the pump body, and therefore liquid in the feeding channel is pumped into the discharging channel. According to the plunger pump of the airless high-pressure sprayer, the piston is driven to move through the swash plate assembly, shaking can be effectively avoided, noise is greatly reduced, and therefore the use experience of a user is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of spraying equipment, and more specifically to a pneumatic high-pressure sprayer. Background Art

[0002] High-pressure airless spraying is a relatively advanced spraying operation method. A high-pressure plunger pump is used to continuously transport paint into a closed paint pipeline, thereby forming high pressure in a closed space. Then, it is sprayed out through small spray holes, making the paint form a fan-shaped mist to achieve an atomization effect. Since no air is mixed into the paint, as well as the relatively high paint transfer efficiency and work production efficiency, a relatively dense coating can be formed on the attachment surface, making the surface quality of airless spraying significantly better than that of air spraying.

[0003] The invention patent with the patent publication number CN103298564B discloses a control valve for pressure regulation of an airless sprayer. The pumping mechanism of the airless sprayer is driven by a swing drive device. The swing drive device includes a connecting rod, a bearing, a rod, and a sleeve. The rotation of the rod generates a linear motion of the ball of the connecting rod through the swing of the sleeve. The ball is mechanically connected to the socket of the piston. Therefore, the connecting rod directly activates the piston in both the forward position and the retracted position. The piston advances and retracts within the piston sleeve in the housing. However, before using such an airless sprayer, the air inside needs to be discharged, but only through the nozzle. The exhaust efficiency is relatively low, affecting the user experience. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a pneumatic high-pressure sprayer that can quickly discharge the air in the pipeline before use and improve the user experience.

[0005] The technical solution of the utility model is to provide a pneumatic high-pressure sprayer with the following structure, including a plunger pump. The plunger pump includes a pump body, a piston assembly, and a drive mechanism. The piston assembly is arranged between the pump body and the drive mechanism. An inlet channel, an outlet channel, and an exhaust channel are provided in the pump body. The piston end of the piston assembly is connected between the inlet channel and the outlet channel. The exhaust channel is communicated with the outlet channel. An inlet check valve is arranged in the inlet channel, an outlet check valve is arranged in the outlet channel, and an exhaust valve is arranged in the exhaust channel. The drive mechanism is used to drive the piston of the piston assembly to move back and forth. When the piston moves back and forth, the liquid in the inlet channel is pumped into the outlet channel.

[0006] After adopting the above structure, the airless high-pressure sprayer of the present utility model has the following advantages compared with the prior art. Since an exhaust passage is provided in the pump body of the present utility model, the exhaust passage is communicated with the discharge passage, and an exhaust valve is provided in the exhaust passage. Opening the exhaust valve can conduct the discharge passage and the exhaust passage. When the sprayer exhausts, it can exhaust through the nozzle and the exhaust passage at the same time, and the exhaust efficiency is relatively high, thereby improving the user experience.

[0007] As an improvement, a piston cavity is further provided in the pump body, and the piston cavity is connected between the feed passage and the discharge passage; the end of the piston is slidably fitted in the piston cavity; when the end of the piston is withdrawn, the liquid in the feed passage is drawn into the piston cavity, and when the end of the piston is pushed in, the liquid in the piston cavity is pushed into the feed passage. After adopting this structure, the pump body has a simple structure and good use effect.

[0008] As an improvement, a nozzle assembly is installed in the pump body, a spraying passage is provided in the nozzle assembly, the spraying passage is connected to the discharge passage, and the liquid in the discharge passage can flow into the spraying passage. After adopting this structure, the structure is simple.

[0009] As an improvement, an installation groove is provided in the pump body, and the nozzle assembly is installed in the installation groove; the outlet of the discharge passage is provided at the bottom of the installation groove, and the end face of the nozzle assembly abuts against the bottom of the installation groove; the inlet of the spraying passage is provided on the end face of the nozzle assembly, and the inlet of the spraying passage is communicated with the outlet of the discharge passage. After adopting this structure, the installation structure of the nozzle assembly is simple and convenient for assembly.

[0010] As an improvement, a feed pipe is provided on the pump body, and an annular gap is left between the outer peripheral wall of the nozzle assembly and the groove wall of the installation groove; the feed pipe is communicated with the annular gap, and a plurality of feed passages are provided in the pump body, and the feed passages are all communicated with the annular gap; the liquid in the feed pipe flows into the annular gap, and then flows from the annular gap into the plurality of feed passages respectively. After adopting this structure, the feed pipe conveys the liquid to each feed passage through the annular gap, with a simple structure and relatively high material conveying efficiency.

[0011] As an improvement, a plurality of diversion grooves are provided on the groove wall of the installation groove, and the inlets between adjacent two feed passages are connected through the diversion grooves; the liquid flowing into the annular gap will fill in the diversion grooves. After adopting this structure, the diversion grooves have a diversion effect, the liquid material conveying flow rate is increased and the conveying effect is good.

[0012] As an improvement, the exhaust passage is communicated with the material spraying passage of the spray head assembly, and the exhaust valve is arranged between the exhaust passage and the material spraying passage. After adopting this structure, the exhaust passage is connected to the material spraying passage, and the gas discharged from the material discharging passage can be quickly discharged through the material spraying passage and the exhaust passage, simplifying the pipeline and having a good exhaust effect.

[0013] As an improvement, the exhaust valve includes a limiting member, an exhaust elastic member and an exhaust valve core; the limiting member is installed on the pump body, and the end of the exhaust valve core passes through the spray head assembly and is sealed at the connection of the exhaust passage and the material spraying passage; the exhaust elastic member is arranged between the limiting member and the exhaust valve core; the exhaust elastic member gives the exhaust valve core a force to move away from the limiting member. After adopting this structure, the exhaust valve has a simple structure and is convenient to assemble.

[0014] As an improvement, an exhaust threaded hole is provided on the pump body, the limiting member is threadedly connected in the exhaust threaded hole, a limiting groove is provided on the end face of the limiting member close to the exhaust valve core, and the end of the exhaust valve core is embedded in the limiting groove; the exhaust elastic member is an exhaust return spring, the return spring is sleeved outside the exhaust valve core, one end of the return spring abuts against the bottom of the limiting groove, and the other end of the return spring abuts against a limiting step on the outer wall of the exhaust valve core. After adopting this structure, the limiting member is threadedly connected in the exhaust threaded hole, and the locking degree of the exhaust valve can be adjusted through the limiting member. When exhaust is needed, the limiting member can be loosened, and exhaust can be carried out more quickly, and the assembly of the exhaust valve is also more convenient.

[0015] As an improvement, an exhaust pipe is provided on the pump body, the end of the exhaust pipe passes through the spray head assembly and is connected to the material spraying passage; the inner cavity of the exhaust pipe forms the exhaust passage; when the exhaust valve is opened, the gas in the material spraying passage can flow into the exhaust pipe. After adopting this structure, the exhaust passage is formed by the exhaust pipe, which has a simple structure and a good sealing effect. Description of the Drawings

[0016] Figure 1 is a three-dimensional structural schematic diagram of the airless high-pressure sprayer of the present invention;

[0017] Figure 2 is an exploded structural schematic diagram of the airless high-pressure sprayer of the present invention;

[0018] Figure 3 is a sectional structural schematic diagram of the airless high-pressure sprayer of the present invention;

[0019] Figure 4Schematic three-dimensional structure diagram of the swash plate body of the airless high-pressure sprayer of the present utility model;

[0020] Figure 5 Partial three-dimensional structure diagram of the airless high-pressure sprayer of the present utility model;

[0021] Figure 6 Partial three-dimensional structure diagram of the drive assembly of the airless high-pressure sprayer of the present utility model;

[0022] Figure 7 Partial exploded structure diagram of the airless high-pressure sprayer of the present utility model;

[0023] Figure 8 Partial sectional structure diagram of the airless high-pressure sprayer of the present utility model;

[0024] Figure 9 Schematic three-dimensional structure diagram of the pump body of the airless high-pressure sprayer of the present utility model;

[0025] Figure 10 is a schematic three-dimensional structure diagram of the pump body of the airless high-pressure sprayer of the present utility model from another angle;

[0026] Figure 11 is a sectional structure diagram of the pump main body of the airless high-pressure sprayer of the present utility model.

[0027] As shown in the figure: 1. Drive assembly, 101. Drive housing, 102. Driver, 103. Rotating shaft, 104. Driving gear, 105. Driven gear, 106. Ring gear, 107. Connecting part, 108. Gear shaft, 2. Swash plate assembly, 201. Swash plate housing, 202. Swash plate body, 203. Thrust bearing, 204. Flange, 205. Connecting shaft, 206. Inclined plane, 208. Shaft hole, 209. Sealing ring, 210. Support seat, 3. Pump main body, 301. Pump body, 302. Pump cover, 303. Feed channel, 304. Discharge channel, 305. Piston cavity, 306. Front end cover, 307. Installation groove, 308. Feed pipe, 309. Flow guiding groove, 310. Exhaust threaded hole, 4. Piston rod, 401. Arc surface, 402. Limit convex ring, 5. Return spring, 6. Sealing member, 7. Feed check valve, 8. Discharge check valve, 9. Sprayer body, 901. Spray material channel, 10. Annular gap, 11. Limiting member, 1101. Limiting groove, 12. Exhaust elastic member, 13. Exhaust valve core, 1301. Limiting step, 14. Exhaust pipe, 1401. Exhaust channel. Detailed implementation manners

[0028] To better understand the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application and do not limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements.

[0029] In the accompanying drawings, for the sake of clarity, the thickness, dimensions, and shapes of the objects have been slightly exaggerated. The drawings are for illustrative purposes only and are not drawn to an exact scale.

[0030] It should also be understood that the terms "comprising", "including", "having", and "containing", when used in this specification, mean the presence of the stated features, wholes, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or combinations thereof.

[0031] As Figures 1 to 5 shown, the present application discloses a pneumatic high-pressure sprayer including a plunger pump, and the plunger pump includes a pump body 3, a piston assembly, and a driving mechanism. The driving mechanism includes a swash plate assembly 2 and a driving assembly 1.

[0032] The pump body 3 includes a pump housing 301, a front end cover 306, and a pump cover 302. Both ends of the pump housing 301 are provided with openings. The pump cover 302 is connected to one end of the pump housing 301 and is hermetically connected to one end of the pump housing 301. The front end cover 306 is connected to the other end of the pump housing 301 and is hermetically connected to the other end of the pump housing 301. An inlet passage 303 and an outlet passage 304 are provided in the pump housing 301. A piston cavity 305 is provided between the pump housing 301 and the pump cover 302. The inlet passage 303 communicates with the piston cavity 305, and the piston cavity 305 communicates with the outlet passage 304. A piston assembly is connected in the piston cavity 305. The piston assembly includes a piston rod 4 and a return elastic member, and the return elastic member is a return spring 5. One end of the piston rod 4 passes through a piston hole in the pump cover 302 and extends into the piston cavity 305. A seal 6 is provided between the outer wall of the piston rod 4 and the inner wall of the piston hole. The seal 6 is used to seal the gap between the piston rod 4 and the piston hole. The return spring 5 is sleeved outside the piston rod 4.

[0033] The described swash plate assembly 2 includes a swash plate housing 201 and a swash plate. The swash plate includes a swash plate body 202 and a thrust bearing 203. The thrust bearing 203 is a plain bearing, which is prior art, and the specific structure of the thrust bearing 203 will not be elaborated further. The swash plate housing 201 is fixedly connected between the drive assembly 1 and the pump body 3. The swash plate body 202 and the thrust bearing 203 are both installed inside the swash plate housing 201. The swash plate body 202 is rotatably installed inside the swash plate housing 201, and the swash plate body 202 is connected to the drive assembly 1. One side of the swash plate body 202 close to the piston rod 4 is provided with an inclined surface 206. A connecting shaft 205 is provided in the middle of the inclined surface 206. The thrust bearing 203 is sleeved outside the connecting shaft 205, and one side of the thrust bearing 203 away from the piston rod 4 abuts against the inclined surface 206, and the thrust bearing 203 is in an inclined state. A flange 204 is provided at the edge of the swash plate body 202, and the flange 204 surrounds the outside of the inclined surface 206. The other side of the thrust bearing 203 abuts against the other end of the piston rod 4. An arc surface is provided at the end of the piston rod 4 close to the thrust bearing 203, and the arc surface abuts against the end surface of the thrust bearing 203.

[0034] One end of the described return spring 5 abuts against the pump cover 302. A limit convex ring is provided on the outer wall of the other end of the piston rod 4. The other end of the return spring 5 abuts against the limit convex ring. The return spring 5 gives a thrust to the other end of the piston rod 4 to move away from the pump cover 302. When the swash plate body 202 rotates, the inclined thrust bearing 203 will push the piston rod 4 to slide back and forth, so as to pump the liquid in the feed channel 303 into the piston cavity 305, and then push the liquid from the piston cavity 305 into the discharge channel 304. A feed one-way valve 7 is provided in the feed channel 303, and the liquid can flow into the piston cavity 305 unidirectionally from the feed channel 303; a discharge one-way valve 8 is provided in the discharge channel 304, and the liquid can flow into the discharge channel 304 unidirectionally from the piston cavity 305.

[0035] Such as Figure 6As shown, the drive assembly 1 includes a drive housing 101, a driver 102 and a transmission assembly. The drive housing 101 is connected to the pump body 3 by fasteners. The transmission assembly is installed inside the drive housing 101. The driver 102 is installed on one side of the drive housing 101 away from the swash plate housing 201. The power output end of the driver 102 is connected to the transmission assembly. The driver 102 is a motor. The output end of the transmission assembly is connected to the swash plate body 202 through a rotating shaft 103. A shaft hole 208 is provided on one side of the swash plate housing 201 close to the drive assembly 1. The rotating shaft 103 passes through the shaft hole 208 and is connected to the swash plate body 202. A sealing ring 209 is provided inside the swash plate housing 201 and on the inner side of the shaft hole 208. The sealing ring 209 is sleeved outside the rotating shaft 103. A support seat 210 is provided between the swash plate body and the sealing ring 209.

[0036] The transmission assembly includes a driving gear 104, a driven gear 105 and a gear ring 106. The gear ring 106 is installed inside the drive housing 101. The driving gear 104 is connected to the output shaft of the driver 102 and is located in the middle of the gear ring 106. At least two driven gears 105 are provided. The driven gears 105 are installed between the driving gear 104 and the gear ring 106. One side of the driven gear 105 meshes with the gear ring 106, and the other side of the driven gear 105 meshes with the driving gear 104. One side of the rotating shaft 103 close to the gear ring 106 is exposed outside the swash plate housing 201, and a connecting portion 107 is provided at the end of the rotating shaft 103. A gear shaft 108 is provided on the end face of the connecting portion 107 close to the gear ring 106. The driven wheel is rotatably connected to the gear shaft 108. In this specific embodiment, three driven wheels are provided. Correspondingly, three gear shafts 108 are also provided. The driving gear 104 drives the driven gears 105 to rotate along the inner circumference of the gear ring 106, thereby driving the rotating shaft 103 to rotate.

[0037] As Figure 7As shown in FIGS. 1 to 11, a spray head assembly is installed in the pump body 3. The spray head assembly includes a spray head body 9. A material spraying channel 901 is provided in the spray head body 9. The material spraying channel 901 is arranged along the axial direction of the spray head body 9 and horizontally penetrates the spray head body 9. An installation groove 307 is provided in the pump body 3. One end of the spray head body 9 passes through the front end cover 306 and abuts against the bottom of the installation groove 307. The outlet of the discharge channel 304 is provided at the bottom of the installation groove 307. The inlet of the material spraying channel 901 is provided on the end face of the spray head body 9. The inlet of the material spraying channel 901 is connected and communicated with the outlet of the discharge channel 304. The liquid in the discharge channel 304 can flow into the material spraying channel 901.

[0038] An inlet pipe 308 is provided on the pump body 3. An annular gap 310 is left between the outer peripheral wall of the spray head assembly and the wall of the installation groove 307. The inlet pipe 308 is communicated with the annular gap 310. A plurality of inlet channels 303 are provided in the pump body 3. The inlet channels 303 are all communicated with the annular gap 310. The liquid in the inlet pipe 308 flows into the annular gap 310 and then flows from the annular gap 310 into the plurality of inlet channels 303 respectively. A plurality of flow guiding grooves 309 are provided on the wall of the installation groove 307. The inlets between two adjacent inlet channels 303 are connected through the flow guiding grooves 309. The liquid flowing into the annular gap 310 fills in the flow guiding grooves 309.

[0039] An exhaust passage 1401 is further provided in the pump body 3. The exhaust passage 1401 is communicated with the discharge passage 304, and an exhaust valve is provided in the exhaust passage 1401. The exhaust valve includes a limit member 11, an exhaust elastic member 12 and an exhaust valve core 13: The limit member 11 is installed on the front end cover 306. An exhaust threaded hole 310 is provided on the front end cover 306, and the limit member 11 is threadedly connected in the exhaust threaded hole 310. The end of the exhaust valve core 13 passes through the nozzle assembly and is sealed at the connection of the exhaust passage 1401 and the material spraying passage 901. A lower side of the front end cover 306 is connected with an exhaust pipe 14. The end of the exhaust pipe 14 passes through the nozzle body 9 and is connected with the material spraying passage 901. The inner cavity of the exhaust pipe 14 forms the exhaust passage 1401, and the lower end of the exhaust valve core 13 plugs at the end of the exhaust pipe 14.

[0040] A limit groove 1101 is provided on an end face of the limit member 11 close to the exhaust valve core 13, and the upper end of the exhaust valve core 13 is embedded in the limit groove 1101. The exhaust elastic member 12 is an exhaust return spring. The exhaust return spring is sleeved outside the exhaust valve core 13. One end of the exhaust return spring abuts against the bottom of the limit groove 1101, and the other end of the exhaust return spring abuts against a limit step 1301 on the outer wall of the exhaust valve core 13. The exhaust elastic member 12 applies a force to the exhaust valve core 13 to move in a direction away from the limit member 11.

[0041] The airless high-pressure sprayer further includes a liquid container. The feeding passage 303 is communicated with the inner cavity of the liquid container, and the lower end of the exhaust pipe 14 extends into the liquid container. When the airless high-pressure sprayer disclosed in the present application is in use, the driver 102 drives the transmission assembly to work. The transmission assembly can drive the rotating shaft 103 to rotate. The rotating shaft 103 drives the swash plate body 202 to rotate. The swash plate body 202 drives the thrust bearing to rotate. Under the pushing action of the inclined thrust bearing, an eccentric force is generated, so that the piston rod 4 reciprocates back and forth in the piston cavity 305, thereby sucking the liquid in the liquid container into the piston cavity 305 through the feeding passage 303, then pushing the liquid in the piston cavity 305 into the discharge passage 304, and then spraying it out from the nozzle assembly through the material spraying passage.

[0042] The airless high-pressure sprayer needs to discharge the internal gas at the beginning. At this time, the limiter 11 can be loosened, and the piston rod 4 reciprocates back and forth. The internal gas will have a certain air pressure, which can push the exhaust valve core 13 to allow the gas to be discharged from the exhaust pipe 14 and the spray channel 901. Wait until liquid is discharged from the nozzle assembly, and then tighten the limiter 11. When the internal pipeline of the sprayer is blocked, the internal pressure of the pipeline will exceed the pressure of the exhaust valve core 13 against the exhaust channel 1401. At this time, the exhaust valve will be bounced open, the exhaust channel 1401 will be conducted, and the exhaust channel 1401 will play a role in pressure relief.

[0043] The present utility model is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of products under the inspiration of the present utility model. However, no matter what changes are made in the shape or structure, all those having the same or similar technical solutions as the present application fall within the protection scope of the present utility model.

Claims

1. An airless high-pressure sprayer, comprising a plunger pump, wherein the plunger pump comprises a pump body, a piston assembly and a drive mechanism; the piston assembly is arranged between the pump body and the drive mechanism, and is characterized in that: The pump body is provided with a feed channel, a discharge channel and an exhaust channel; the piston end of the piston assembly is connected between the feed channel and the discharge channel, and the exhaust channel is communicated with the discharge channel; the feed channel is provided with a feed check valve, the discharge channel is provided with a discharge check valve, and the exhaust channel is provided with an exhaust valve; the driving mechanism is used to drive the piston of the piston assembly to move back and forth, and the piston draws the liquid in the feed channel into the discharge channel when moving back and forth.

2. The airless high-pressure sprayer according to claim 1, characterized in that: A piston cavity is also provided in the pump body, and the piston cavity is connected between the feed channel and the discharge channel; the end of the piston is slidably fitted in the piston cavity; when the end of the piston is withdrawn, the liquid in the feed channel is drawn into the piston cavity, and when the end of the piston is pushed in, the liquid in the piston cavity is pushed into the feed channel.

3. The airless high-pressure sprayer according to claim 2, characterized in that: A spray head assembly is installed in the pump body, a spray channel is arranged in the spray head assembly, the spray channel is connected with the discharge channel, and the liquid in the discharge channel can flow into the spray channel.

4. The airless high-pressure sprayer according to claim 3, characterized in that: A mounting groove is provided in the pump body, and the nozzle assembly is installed in the mounting groove; the outlet of the discharge channel is provided at the bottom of the mounting groove, and the end face of the nozzle assembly abuts against the bottom of the mounting groove; the inlet of the spray channel is provided on the end face of the nozzle assembly, and the inlet of the spray channel is connected to the outlet of the discharge channel.

5. The airless high-pressure sprayer according to claim 4, characterized in that: A feed pipe is provided on the pump body, and an annular gap is left between the outer peripheral wall of the nozzle assembly and the groove wall of the mounting groove; the feed pipe is connected with the annular gap, and a plurality of feed channels are provided in the pump body, and the feed channels are all connected with the annular gap; the liquid in the feed pipe flows into the annular gap, and then flows from the annular gap to the plurality of feed channels respectively.

6. The airless high-pressure sprayer according to claim 5, characterized in that: A plurality of guide grooves are arranged on the groove wall of the installation groove, and the entrances of two adjacent feeding channels are connected through the guide grooves; the liquid flowing into the annular gap will be filled in the guide grooves.

7. The airless high-pressure sprayer according to claim 4, characterized in that: The exhaust passage is communicated with the spray passage of the nozzle assembly, and the exhaust valve is arranged between the exhaust passage and the spray passage.

8. The airless high-pressure sprayer according to claim 7, characterized in that: The exhaust valve includes a limit piece, an exhaust elastic piece and an exhaust valve core; the limit piece is installed on the pump body, and the end of the exhaust valve core passes through the nozzle assembly and is sealed at the connection between the exhaust channel and the injection channel; the exhaust elastic piece is arranged between the limit piece and the exhaust valve core; the exhaust elastic piece applies a force to the exhaust valve core to move away from the limit piece.

9. The airless high-pressure sprayer according to claim 8, characterized in that: An exhaust threaded hole is provided on the pump body, and the limit piece is threadedly connected in the exhaust threaded hole; a limit groove is provided on the end face of the limit piece close to the exhaust valve core, and the end of the exhaust valve core is embedded in the limit groove; the exhaust elastic piece is an exhaust return spring, and the return spring is sleeved on the outside of the exhaust valve core, one end of the return spring abuts against the bottom of the limit groove, and the other end of the return spring abuts against the limit step on the outer wall of the exhaust valve core.

10. The airless high-pressure sprayer according to claim 8, characterized in that: An exhaust pipe is provided on the pump body, and the end of the exhaust pipe passes through the nozzle assembly and is connected to the spray channel; the inner cavity of the exhaust pipe forms the exhaust channel; when the exhaust valve is opened, the gas in the spray channel can flow into the exhaust pipe.

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