Nozzle replacement structure of sprayer

Abstract

The utility model provides a nozzle replacement structure of a sprayer, which comprises a shell, a nozzle, a nozzle, a nozzle and a nozzle, the flow control pipe is provided with a connecting section which is exposed out of the position of the front opening; the nozzle assembly comprises a collecting pipe, a nozzle cap, a shunting block and a coating box; wherein the collecting pipe is provided with a spraying head part and a sleeving part, and a material receiving hole is formed above the spraying head part; a nozzle hole is formed in the front end of the nozzle cap and is exposed out of the nozzle part; a material guide channel corresponding to the material receiving hole is arranged above the shunting block, and a material guide convex nozzle extending to the nozzle hole is arranged in front of the shunting block; the paint box is provided with a feeding joint and is arranged in the material receiving hole; the nozzle assembly sleeves the joining section through the sleeving part; by means of the sprayer, the effects of being convenient to disassemble and easy to clean and replace the spray head are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a nozzle replacement structure of a sprayer, in particular to a nozzle assembly of the sprayer which is easy to disassemble, clean and replace. BACKGROUND

[0002] Nowadays, airbrushes can use air compressors to spray paint evenly. Figure 1 , Figure 2As shown, the existing spray gun 10 includes a housing 11, a nozzle 12 and a control assembly 13; the housing 11 includes a main body 111 and a handle shell 112, the main body 111 and the handle shell 112 can be screwed together or separated, the main body 111 is connected to a reservoir 14, the reservoir 14 contains paint that can be applied by the spray gun 10. The main body 111 has an air inlet 113 on its bottom side, the air inlet 113 is provided with a pipe joint 15, the pipe joint 15 is used to connect to a compressed air source (not shown), such as an air compressor; the nozzle 12 is arranged at the front end of the main body 111; and the control assembly 13 is positioned in the housing 11, which includes a needle 131, a clamping guide 132, a lever 133, an auxiliary rod 134 and a compression spring 135; the needle 131 passes through the clamping guide 132, the compression spring 135 is assembled around the clamping guide 132, one end of the compression spring 135 is adjacent to the edge of the clamping guide 132; the needle 131 extends through the hole 136 at the bottom of the lever 133 and the opening 137 at the bottom of the auxiliary rod 134, thereby, under no external force, the compression spring 135 pushes the clamping guide 132, thereby pushing the auxiliary rod 134 and the lever 133, at this time, the needle 131 extends through the nozzle 12, so that the tip of the needle 131 is fully engaged in the nozzle 12, so that the nozzle 12 is in a closed state; manually pushing the lever 133 against the auxiliary rod 134 and pushing the clamping guide 132 against the compression spring 135, at this time, the needle 131 moves slightly backward, so that the nozzle 12 is in an open state, so that the pressurized airflow enters the housing 11 through the pipe joint 15 and the air inlet 113, and passes through the nozzle 12 according to the Venturi effect, when the pressurized airflow passes through the narrow pipe, the fluid velocity increases, and according to Bernoulli's principle, the increase in velocity is accompanied by a decrease in pressure, which generates suction, when sufficient suction is obtained from the pressurized airflow, the reservoir 14 also releases paint dispersed into fine mist or atomized through the nozzle 12. However, the spray gun 10 described above is very important to clean after use, because paint remaining in the spray gun 10 may affect the next use, even cause blockage or damage. When cleaning, the handle shell 112, the nozzle 12, the clamping guide 132, the needle 131, the compression spring 135 and other detachable parts need to be removed from the spray gun 10, and the cleaning liquid is poured into the reservoir 14, and then the pressurized airflow of the air compressor is used to suck out the cleaning liquid to make it pass through the paint flow channel. Due to the deep structure, multiple repeated cleaning is required to clean completely; as for the detachable parts, a brush or a cotton swab is used to gently clean the nozzle 12, the needle 131 and other detachable parts, so that they are completely clean. As can be seen, the components are complex, and disassembly and cleaning are quite time-consuming and laborious.Furthermore, the spray gun 10 can only be used in a cleaning manner to use different paints, so that different paints must be prepared several spray guns 10 or temporarily cleaned and refilled with different paints, which wastes time and is troublesome to use. Content of the utility model

[0003] The utility model mainly aims at providing a nozzle replacement structure of a sprayer, which is provided with replaceable nozzle assemblies, can be easily detached, replaced, can flexibly spray different paints, has compact and simple structure, and has the advantages of lightness, portability, convenience and easy cleaning.

[0004] According to the above purpose of the utility model, a nozzle replacement structure of a sprayer is provided, which comprises: a shell, which is provided with a head shell above a base shell, a handle shell below the base shell, and a front opening in the front of the head shell; a flow control pipe, which is positioned between the base shell and the head shell; the flow control pipe is provided with an adapter section outside, and the adapter section is exposed at the position of the front opening; and a nozzle assembly, which comprises a flow collection pipe, a nozzle cap, a flow distribution block and a paint box; wherein the flow collection pipe is a hollow sleeve, the front section of which is provided with a spray head, the rear section of which is provided with a socket part, the front end of the spray head is provided with a nozzle opening, and the top of the spray head is provided with a material receiving hole; the nozzle cap is provided with a conical air chamber inside, and the front end of the nozzle cap is provided with a nozzle hole communicating with the conical air chamber, the nozzle cap is arranged in the spray head, and the nozzle hole is exposed outside the nozzle opening; the flow distribution block is arranged in the spray head, and one side of the flow distribution block abuts against the nozzle cap, the flow distribution block is provided with a material guide channel corresponding to the material receiving hole above, and a material guide nozzle is provided in front of the flow distribution block, the material guide nozzle extends to the nozzle hole, and a gap is formed between the nozzle hole and the material guide nozzle, which communicates with the conical air chamber; at least one air flow channel communicating with the conical air chamber is provided on the side of the flow distribution block, the direction of the material guide channel is turned along the direction of the material guide nozzle to communicate with the nozzle hole; and the paint box is provided with a protruding material inlet connector inserted into the material receiving hole; the nozzle assembly is sleeved with the adapter section through the front opening to sleeve the adapter section, so that the nozzle assembly is arranged on the head shell.

[0005] In an embodiment of the utility model, the lower edge of the front opening is provided with a clamping groove which is open upward and on one side, and the lower edge of the socket part is provided with a clamping block corresponding to the clamping groove, the flow collection pipe is rotated forward and backward to make the clamping block embedded in or separated from the clamping groove.

[0006] In an embodiment of the utility model, the adapter section is provided with at least one ring groove, an O-ring is sleeved in the ring groove, and the O-ring is tightly abutted against the inner ring wall surface of the socket part.

[0007] In the embodiment of the utility model, wherein the head shell top is equipped with an upper opening, the handle shell upper side has an air outlet valve pipe, one end of the flow control pipe is equipped with a large exhaust passage, and a large sealing port is formed at the large exhaust passage port, and the large sealing port is exposed at the upper opening position of the operation part; a parallel side of the large exhaust passage is equipped with a small exhaust passage, and a small sealing port is formed at the small exhaust passage port, and the small sealing port is exposed at the upper opening position of the operation part; the other end of the flow control pipe is equipped with a forced air inlet, the forced air inlet is communicated with the large exhaust passage and the small exhaust passage respectively, and the inner diameter size of the large exhaust passage is larger than the inner diameter size of the forced air inlet, the inner diameter size of the forced air inlet is larger than the inner diameter size of the small exhaust passage, the lower side of the flow control pipe is equipped with an air inlet passage, one end of the air inlet passage is communicated with the large exhaust passage and the forced air inlet, and the other end of the air inlet passage is communicated with the air outlet valve pipe through the base shell, the outside of the flow control pipe is extended along the forced air inlet to form the connecting section, so that the forced air inlet is communicated with the flow collecting pipe.

[0008] In the embodiment of the utility model, wherein the base shell upper side is equipped with a positioning column and a through hole respectively, the outside of the flow control pipe is equipped with a mounting plate perpendicular to the axial direction, and the two ends of the mounting plate are screwed on the positioning column through screws, and the air inlet passage passes through the through hole.

[0009] The above-mentioned sprayer has the advantages of convenient disassembly, easy cleaning and replacement of the nozzle. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 It is an existing perspective exploded view;

[0011] Figure 2 It is an existing side view sectional view;

[0012] Figure 3 It is a perspective exploded view of the utility model;

[0013] Figure 4 It is a combined perspective view of the utility model;

[0014] Figure 5 It is a schematic sectional view of the utility model large sealing port unsealed pressurized air flow direction;

[0015] Figure 6 It is a schematic sectional view of the utility model large sealing port closed pressurized air flow direction;

[0016] Figure 7 It is a schematic sectional view of the utility model large and small sealing ports closed pressurized air flow direction;

[0017] Figure 8 It is a schematic sectional view of the utility model nozzle assembly extraction.

[0018] Fig.:

[0019] 1: finger; 2: paint; 10: spray gun; 11: housing; 111: main shell; 112: hand shell; 113: air inlet; 12: nozzle; 13: control assembly; 131: thimble; 132: clamping guide; 133: lever; 134: auxiliary rod; 135: compression spring; 136: hole; 137: opening; 14: liquid reservoir; 15: pipe joint; 16: air flow channel; 20: housing; 21: base shell; 211: positioning column; 212: perforation; 22: head shell; 221: front opening; 222: locking groove; 23: handle shell; 231: air outlet valve pipe; 24: handle part; 25: operating part; 251: upper opening; 30: flow control pipe; 31: large exhaust passage; 311: large sealing opening; 32: small exhaust passage; 321: small sealing opening; 33: forced air passage; 34: air inlet passage; 35: connecting section; 351: ring groove; 352: O-ring; 36: mounting plate; 361: screw; 40: nozzle assembly; 41: manifold; 411: spray head; 412: sleeve part; 413: locking block; 414: nozzle opening; 415: material receiving hole; 42: nozzle cap; 421: conical air chamber; 422: nozzle hole; 43: flow dividing block; 431: material guiding passage; 432: material guiding protrusion; 433: air flow channel; 44: paint box; 441: material inlet joint; 45: gap; 46: small spray; 47: large spray. DETAILED DESCRIPTION

[0020] The utility model will be further explained in connection with the drawings and specific embodiments, so that the person skilled in the art can better understand the utility model and can be implemented, but the embodiment is not as the limitation of the utility model.

[0021] Please refer to Figures 3 to 8A nozzle replacement structure of a sprayer includes: a housing 20, which is composed of a base shell 21, a head shell 22 above the base shell 21, and a handle shell 23 below the base shell 21, so that the housing 20 has a downwardly extending handle portion 24 and an operating portion 25 at the top of the head shell 22; the base shell 21 has two corresponding positioning columns 211 and a through hole 212 on each side, and the head shell 22 has a front opening 221 in front, the lower edge of which has a clamping groove 222 that is open on the top and one side; the operating portion 25 has an upper opening 251, and the handle shell 23 has an air outlet valve tube 231 that can output pressurized airflow; a flow control tube 30 is positioned between the base shell 21 and the head shell 22, one end of the flow control tube 30 has a vertical large air outlet channel 31, and a large sealing port 311 is formed at the end of the large air outlet channel 31, which is exposed at the position of the upper opening 251 of the operating portion 25; a parallel side of the large air outlet channel 31 has a small air outlet channel 32, and a small sealing port 321 is formed at the end of the small air outlet channel 32, which is also exposed at the position of the upper opening 251 of the operating portion 25; the other end of the flow control tube 30 has a forced air passage 33 that communicates with the large air outlet channel 31 and the small air outlet channel 32, respectively, and the inner diameter of the large air outlet channel 31 is larger than that of the forced air passage 33, and the inner diameter of the forced air passage 33 is larger than that of the small air outlet channel 32; the flow control tube 30 has an air inlet channel 34 below, one end of which communicates with the large air outlet channel 31 and the forced air passage 33, and the other end communicates with the air outlet valve tube 231 through the through hole 212 of the base shell 21; an extension section 35 extends along the forced air passage 33 outside the flow control tube 30, the extension section 35 has at least one ring groove 351, and an O-ring 352 is sleeved in the ring groove 351, and the extension section 35 is exposed at the position of the front opening 221 of the head shell 22; the flow control tube 30 has a mounting plate 36 that is perpendicular to its axis outside, and the two ends of the mounting plate 36 are respectively screwed on the positioning columns 211 by screws 361, so that the flow control tube 30 can be correctly positioned and installed on the base shell 21; and a nozzle assembly 40, which includes a flow tube 41, a cap 42, a flow dividing block 43, and a coating box 44; the flow tube 41 is a hollow sleeve, the front end of which is a spray head portion 411, and the rear end of which is a sleeve portion 412, the lower edge of which has a clamping block 413 corresponding to the clamping groove 222, the front end of the spray head portion 411 has a nozzle opening 414 that communicates with the inside of the flow tube 41, and the top of the spray head portion 411 has a material receiving hole 415 that communicates with the inside of the flow tube 41; the cap 42 has a conical air chamber 421 inside, and a nozzle hole 422 that communicates with the conical air chamber 421 at the front end, the cap 42 is arranged in the spray head portion 411 of the flow tube 41, and the nozzle hole 422 is exposed outside the nozzle opening 414;The diverter block 43 is disposed inside the nozzle head 411 of the manifold 41, and one side of it abuts against the nozzle cap 42. The diverter block 43 has a guide channel 431 corresponding to the receiving hole 415 above it, and a guide protrusion 432 in front of it. The guide protrusion 432 extends to the nozzle hole 422, and a gap 45 communicating with the conical air chamber 421 is maintained between the nozzle hole 422 and the guide protrusion 432. The diverter block 43 has at least one airflow channel 433 on the side of the guide protrusion 432 that communicates with the conical air chamber 421. The guide channel 431 turns in the direction of the guide protrusion 432 and communicates with the nozzle hole 422. The paint box 44 has a protruding inlet. The head 441, the feed connector 441 is installed in the receiving hole 415; the nozzle assembly 40, through the sleeve portion 412 of the manifold 41 and the connecting section 35 of the flow control tube 30 via the front opening 221, connects the forced air passage 33 to the manifold 41, and the O-ring 352 is tightly pressed against the inner ring wall of the sleeve portion 412. The manifold 41 can be rotated so that the locking block 413 is inserted into the locking groove 222 from the side, thereby fixing the nozzle assembly 40 onto the head shell 22. With the above-mentioned sprayer, the coating 2 is sprayed out by closing or opening the large sealing port 311 and the small sealing port 321 with the finger 1, achieving the effects of easy disassembly, easy cleaning and replacement of the nozzle.

[0022] The composition, function, and effects of the above embodiments are described in detail below: Figures 3 to 8 As shown, in use, the pressurized airflow is first output from the outlet valve pipe 231, and then enters the inlet channel 34 of the flow control pipe 30. When the large sealing port 311 and the small sealing port 321 are in an open state (e.g.) Figure 5 As shown), according to Courant's law, when airflow passes through a branch point, the speed and pressure of the airflow change with the width of the pipe, and the slower the gas flows through the pipe, the less resistance there is. Therefore, when pressurized airflow passes through the large exhaust channel 31 with a large inner diameter, the speed of the pressurized airflow will slow down, generating less resistance. Therefore, the airflow will flow towards the large pipe with less resistance. Thus, the pressurized airflow will be discharged from the large exhaust channel 31 and the large sealing port 311. In this state, the paint 2 spraying or atomizing action is not performed. When spraying or atomizing, the user holds the handle 24 with their hand, moves one finger 1 to the operating part 25, and covers the large sealing port 311 with the finger 1, so that the large exhaust channel 31 is closed (as shown). Figure 6As shown), at this time, the pressurized airflow can only enter the manifold 41 through the forced air passage 33. Part of the pressurized airflow is discharged through the small sealing port 321 of the small exhaust passage 32, causing a slight decrease in pressurized airflow pressure. The pressurized airflow then passes through the airflow passage 433 to the conical air chamber 421. The conical air chamber 421 is a constricted pipe, narrowing most at the nozzle orifice 422, ensuring the pressurized airflow has the lowest velocity when passing through the gap 45 between the nozzle orifice 422 and the guide protrusion 432. Quickly, in this way, the outlet of the material guide channel 431 obtains sufficient suction due to low pressure, causing the paint 2 in the paint box 44 to be drawn down and transported to the material guide channel 431 of the diverter block 43, and sprayed out from the nozzle hole 422 through the material guide protrusion 432, so that it mixes with the pressurized gas passing through the nozzle hole 422, causing the paint 2 to be dispersed into small particles and forming a mist spray; since the pressurized airflow is in a depressurized state discharged from the small exhaust channel 32, a small spray 46 can be sprayed out.

[0023] If finger 1 is simultaneously covered on both the large sealing opening 311 and the small sealing opening 321 (e.g.) Figure 7 As shown), at this time, all the pressurized airflow can only go to the conical air chamber 421. In this way, since the pressurized airflow is not depressurized, a large spray 47 can be ejected.

[0024] In this invention, the flow control tube 30 is fixedly positioned within the head housing 22, while the nozzle assembly 40 is movably assembled. By slightly reversing the manifold 41 to disengage the locking block 413 from the locking groove 222, and then pulling it out, the nozzle assembly 40 can be disengaged from the connecting section 35 of the flow control tube 30. This allows the sleeve portion 412 of the manifold 41 to leave the front opening 221 of the head housing 22, thus separating the sprayer from the nozzle assembly 40 (e.g., Figure 8 As shown in the figure, if you want to replace the nozzle assembly 40 with a different paint 2 immediately or replace an old nozzle assembly 40, you can do so easily and quickly, achieving the effect of easy nozzle replacement.

[0025] Furthermore, if the sprayer has been used and needs to be cleaned, only the nozzle assembly 40 is the part that gets contaminated with paint 2 when the sprayer is used, while other sprayer parts do not need to be cleaned. When you want to clean the nozzle assembly 40, you can remove the diverter block 43 from the manifold 41, then remove the nozzle cap 42 from the manifold 41, and pull the paint box 44 out of the receiving hole 415. This makes it convenient to clean each part carefully after use without having to go through the trouble of disassembling the entire sprayer assembly, achieving the effect of easy disassembly and easy cleaning.

[0026] After the nozzle assembly 40 is cleaned, the nozzle cap 42, the flow dividing block 43 and the paint box 44 are put back into the manifold 41, the sleeve joint 412 of the manifold 41 is put back into the connecting section 35 of the flow control pipe 30 towards the front opening 221, and finally the manifold 41 is rotated in the normal direction to make the locking block 413 embedded into the locking groove 222, thus completing the assembly of the sprayer after cleaning. The O-ring 352 embedded on the outer periphery of the connecting section 35 can make the nozzle assembly 40 assembled on the connecting section 35 sealed and leakproof, and can also realize the function of quick replacement.

[0027] Through the above structure, the utility model has the following advantages:

[0028] The structure of the sprayer designs the parts to be cleaned as the nozzle assembly 40 which is assembled movably, thus making the cleaning more convenient and easy.

[0029] The nozzle assembly 40 only needs to be disassembled from the sprayer and then cleaned, and if necessary, the old one can be replaced with a new one or the paint 2 can be replaced, thus making the use very convenient.

[0030] The above-mentioned embodiments are only the preferred embodiments for fully illustrating the utility model, and the protection scope of the utility model is not limited thereto. The equivalent substitutions or transformations made by the person skilled in the art on the basis of the utility model are all within the protection scope of the utility model.

Claims

1. A nozzle replacement structure of a sprayer, characterized by, The application relates to a paint spraying device, which comprises a housing, a flow control pipe, a nozzle assembly and a front opening. The housing comprises a base shell, a head shell and a handle shell. The flow control pipe is positioned between the base shell and the head shell. The flow control pipe is provided with a connecting section outside the housing. The nozzle assembly comprises a manifold, a nozzle cap, a flow distribution block and a paint box. The manifold is a hollow sleeve, the front section of which is provided with a spraying head, the rear section of which is provided with a sleeve section. The spraying head is provided with a nozzle opening at the front end and a material receiving hole above the nozzle opening. The nozzle cap is provided with a conical air chamber inside the nozzle cap, and a nozzle hole is formed at the front end of the nozzle cap. The nozzle cap is arranged in the spraying head, and the nozzle hole is exposed outside the nozzle opening.

2. The nozzle replacement structure of the sprayer according to claim 1, wherein The flow distribution block is arranged in the spraying head and abuts against the nozzle cap.

3. The nozzle replacement structure of the sprayer according to claim 1, wherein The flow distribution block is provided with a material guide channel corresponding to the material receiving hole above the flow distribution block, and a material guide nozzle is formed at the front of the flow distribution block.

4. The nozzle replacement structure of the sprayer according to claim 1, wherein The material guide nozzle extends to the nozzle hole, and a gap is formed between the nozzle hole and the material guide nozzle, which is communicated with the conical air chamber. The flow distribution block is provided with at least one air flow channel capable of communicating with the conical air chamber at the side of the material guide nozzle. The direction of the material guide channel is turned along the direction of the material guide nozzle to communicate with the nozzle hole. The paint box is provided with a protruding material inlet connector which is inserted into the material receiving hole. The nozzle assembly is assembled on the head shell through the sleeve section of the flow control pipe. The lower edge of the front opening is provided with a clamping groove which is open above and on one side. The sleeve section is provided with a clamping block corresponding to the clamping groove. The connecting section is provided with at least one ring groove. The ring groove is provided with an O-shaped ring which is tightly abutted against the inner ring wall surface of the sleeve section. The top of the head shell is provided with an operating part which is provided with an upper opening. The handle shell is provided with an air outlet valve pipe above the handle shell. One end of the flow control pipe is provided with a large air outlet channel, and a large sealing port is formed at the port of the large air outlet channel. The large air outlet channel is provided with a small air outlet channel at one parallel side, and a small sealing port is formed at the port of the small air outlet channel. The other end of the flow control pipe is provided with a forced air inlet channel. The forced air inlet channel is communicated with the large air outlet channel and the small air outlet channel. The inner diameter of the large air outlet channel is larger than the inner diameter of the forced air inlet channel. The inner diameter of the forced air inlet channel is larger than the inner diameter of the small air outlet channel. The lower part of the flow control pipe is provided with an air inlet channel. One end of the air inlet channel is communicated with the large air outlet channel and the forced air inlet channel. The other end of the air inlet channel is communicated with the air outlet valve pipe through the base shell. The connecting section is formed by extending the flow control pipe along the forced air inlet channel. The forced air inlet channel is communicated with the manifold.

5. The nozzle replacement structure of the sprayer according to claim 4, wherein The base shell is provided with two positioning columns and a through hole on each side, and the flow control pipe is provided with a mounting plate perpendicular to the axial direction, and the two ends of the mounting plate are respectively screwed on the positioning columns by screws, and the air inlet channel passes through the through hole.

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