Small oil misting lance

Abstract

The utility model relates to atomization spray gun technical field, concretely relates to a small oil liquid atomization spray gun. An oil liquid atomization spray gun, which comprises: a spray gun pipe body, the spray gun pipe body is equipped with oil cavity, gas cavity and the oil inlet hole, atomization gas hole that are connected with oil cavity, gas cavity, piston cavity respectively in sequence and are spaced in sequence in the axial direction; a spray head assembly, the spray head assembly is installed in one end of the spray gun pipe body, and the spray head assembly comprises an oil outlet nozzle and an air outlet cap, the air outlet cap is sleeved on the oil outlet nozzle, the oil outlet hole of the oil outlet nozzle is arranged on the inside of the air outlet hole of the air outlet cap, the oil outlet nozzle and the air outlet cap are equipped with the air outlet cavity that is linked with the air outlet hole of the air outlet cap between the air outlet cap, the spray gun pipe body is equipped with the air channel that links the gas cavity and the air outlet cavity; a gas isolation cover, which comprises an annular isolation wall arranged between the oil outlet nozzle and the air outlet cap; a group of air guide grooves are arranged between the air outlet cavity and the air channel, the air channel comprises air holes arranged in each air guide groove, all the air holes are arranged in a ring shape, and the air holes are connected with the gas cavity. The economic efficiency of small-size spray gun manufacturing can be improved.

Description

Technical Field

[0001] This utility model relates to the field of atomizing spray gun technology, specifically to a small oil atomizing spray gun. Background Technology

[0002] On automated production lines for food products such as cakes and candies that rely on molds for shaping, oil needs to be sprayed onto the molds to prevent the shaped products from sticking to them, thus ensuring the integrity of the product shape after demolding.

[0003] To ensure atomization, two air passages, one inside and one outside, need to be set in the air outlet chamber. For example, the food processing mold release oil gun disclosed in Chinese Utility Model Patent Application No. 2022233344931 uses an air baffle to separate the gas from the air chamber into two nested air passages. Corresponding to these two air passages, two sets of air holes connecting the air chamber and the air outlet chamber need to be machined on the spray gun tube. The openings of the two sets of air holes on the side near the air outlet chamber correspond to the radial sides of the annular isolation wall.

[0004] However, in miniaturized spray guns (such as candy mold spray guns), the radial dimension of the spray gun tube is too small, making it too difficult to machine two sets of holes with different radial positions, thus affecting manufacturing costs. Therefore, there is an urgent need to design a new flow channel scheme that connects the air chamber and the air outlet chamber to improve the economics of manufacturing small-sized spray guns. Utility Model Content

[0005] To overcome the shortcomings of the prior art, this utility model provides a small oil atomizing spray gun, which can improve the economic efficiency of manufacturing small-sized spray guns.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0007] An oil atomizing spray gun, comprising:

[0008] The spray gun tube is provided with an oil chamber and an air chamber spaced apart axially, as well as an oil inlet and an atomizing air inlet connected to the oil chamber, air chamber and piston chamber respectively.

[0009] The nozzle assembly is installed at one end of the spray gun tube. The nozzle assembly includes an oil outlet and an air outlet cap. The air outlet cap is fitted onto the oil outlet. The oil outlet hole of the oil outlet is located inside the air outlet hole of the air outlet cap. An air outlet chamber is provided between the oil outlet and the air outlet cap, which is connected to the air outlet hole of the air outlet cap. An air passage is provided on the spray gun tube to connect the air chamber and the air outlet chamber.

[0010] A gas hood is provided in the gas outlet chamber, and the gas hood includes an annular isolation wall provided between the oil outlet nozzle and the gas outlet cap;

[0011] A set of air guide grooves is provided between the air outlet chamber and the air passage. The air passage includes air holes set in each air guide groove. All air holes are arranged in a ring and connected to the air chamber. The air guide groove includes a first air guide groove and a second air guide groove. The first air guide groove extends radially outward from the position of the air hole to the radial outer side of the annular isolation wall, and the second air guide groove extends radially inward from the position of the air hole to the radial inner side of the annular isolation wall.

[0012] Based on the above structure, a method for using a small oil atomizing spray gun is as follows: oil and air are respectively introduced into the oil inlet and atomizing air outlet. The oil passes through the oil chamber and is sprayed out from the oil outlet, while the gas passes through the air chamber and the air outlet chamber and is sprayed out from the air outlet of the air outlet cap to atomize the oil. Among them, the air baffle is used to divide the gas entering the air outlet chamber into two annular nested inner and outer paths.

[0013] Furthermore, in this application, a small oil atomizing spray gun has an air guide groove disposed on the end face of the spray gun tube near the air outlet chamber. One axial end of the annular isolation wall has an annular flange that abuts against the end of the spray gun tube near the air outlet chamber, and the annular flange covers the position of the air guide groove corresponding to the air hole. As a preferred embodiment of this application, based on the above structure, disposing of the air guide groove on the spray gun tube has the advantage of simpler processing compared to disposing of the air guide groove on the air shield. Furthermore, the annular flange ensures that the first and second air guide grooves respectively guide the air from the air hole to both sides of the annular isolation wall, thereby ensuring the stability of the air volume entering both sides of the annular isolation wall.

[0014] Furthermore, in a small oil atomizing spray gun of this application, the number of air holes in each air guide groove is 1, and the number of first air guide grooves is greater than the number of second air guide grooves.

[0015] Furthermore, in a small oil atomizing spray gun of this application, the air guide groove extends radially from the air hole location and simultaneously widens laterally, such that the end of the air guide groove away from the air hole in the radial direction is wider than the other end.

[0016] Furthermore, a small oil atomizing spray gun of this application includes an air hood comprising an annular isolation plate integrally disposed on the inner and outer sides of an annular isolation wall. The inner and outer annular isolation plates are axially arranged, and the annular isolation plates are provided with a plurality of circumferentially arrayed air guide notches. The air guide notches on axially adjacent annular isolation plates are staggered in the circumferential direction. As a preferred embodiment of this application, the annular isolation plate is used to axially isolate the air outlet chamber separated by the annular isolation wall, and the air guide notches on axially adjacent annular isolation plates are staggered in the circumferential direction, which has a flow-blocking effect and prevents the airflow from being ejected too quickly. The traditional connection relationship between the annular isolation plate and the air hood is a partially separate nested form, such as setting the annular isolation plate on the inner side of the annular isolation wall in another insert and embedding it into the air hood. This form affects the reduction of radial dimensions. This application adopts a one-piece processing form, which can eliminate the setting of the limiting structure and improve the miniaturization of the size. In this embodiment, the form of the air guide notch includes an arc-shaped notch with an outer opening and a perforation.

[0017] Furthermore, in this application, a small oil atomizing spray gun has an annular partition wall that extends axially from the end furthest from the annular flange to the end of the annular partition plate. This is a preferred embodiment of the application, ensuring the effective segmentation of the air path ejected from the air guide openings on both the inner and outer sides.

[0018] Furthermore, the small oil atomizing spray gun of this application also includes:

[0019] A piston chamber and a switching air port are provided on the spray gun tube. The piston chamber is located on the side of the air chamber away from the oil chamber, and the switching air port is connected to the piston chamber.

[0020] The piston rod includes a piston head that is slidably disposed in the piston chamber and a pin connected to the piston head. The front end of the pin cooperates with the oil outlet hole of the oil outlet. Moving the piston rod is used to switch the opening and closing state of the oil outlet.

[0021] A spacer is placed between the gas chamber and the piston chamber to isolate them.

[0022] A diaphragm is placed between the oil chamber and the gas chamber to isolate them.

[0023] Furthermore, in this application, a small oil atomizing spray gun has a spacer and a stopper respectively located at both ends of the air chamber along its axial direction. The axial distance 'a' between the spacer and the stopper is greater than 1 / 3 of the outer diameter 'd' of the air chamber. As a preferred embodiment of this application, to save axial space, the traditional layout of the spacer and stopper often adopts a compact arrangement. However, when applied to this application, with the radial dimension reduced, the traditional layout leads to unstable air output. After adjustment and testing, by increasing the axial distance between the spacer and the stopper, the axial space of the air chamber is extended, thereby increasing the volume of the air chamber. With the radial dimension reduced, extending the axial distance between the spacer and the stopper increases the buffer volume within the air chamber, thereby alleviating the unstable air output caused by fluctuations in the air source intake.

[0024] Furthermore, in this application, a small oil atomizing spray gun has sealing ring mounting grooves at both ends of a diaphragm. A sliding sealing ring is installed in the sealing ring mounting groove, and a ejector pin slides through the sliding sealing ring. The sliding sealing ring seals the radial gap between the diaphragm and the ejector pin. The diaphragm includes a middle section located axially between a pair of sealing ring mounting grooves. The middle section has a through hole that mates with the ejector pin. An annular groove is located on the outer side of the middle section, and the annular groove has several circumferentially arranged oil leakage holes that communicate with the through hole. A detection hole is provided through the side wall of the spray gun tube, and the inner opening of the detection hole is connected to the annular groove. As a preferred embodiment of this application, since the sliding sealing ring is a consumable part, if the sliding sealing ring is damaged and not detected in time, oil will leak into the air chamber, causing a malfunction. In order to detect the damage of the sliding sealing ring in advance, by providing oil leakage holes and an annular groove on the middle section, when the sliding sealing ring on the side near the oil chamber is damaged, the oil will be guided to the annular groove and then leak out from the detection hole. Therefore, the damage of the sliding sealing ring on the side near the oil chamber can be detected in time. Furthermore, due to the design of the annular groove, even if the oil leakage hole and the detection hole are circumferentially misaligned, the oil can still be guaranteed to leak out from the detection hole, thereby reducing assembly precision requirements.

[0025] Furthermore, in this application, a small oil atomizing spray gun has a countersunk hole at one end of the air chamber near the oil chamber, and a threaded connection section in the middle section. The threaded connection section is located at the end of the annular groove away from the oil chamber and is threadedly connected to the countersunk hole. The end of the diaphragm near the oil chamber abuts against the axial end face of the countersunk hole. A sealing ring is provided between the diaphragm and the axial end face of the countersunk hole, and a ejector pin passes through the sealing ring. The sealing ring is used to seal the gap between the diaphragm and the axial countersunk hole.

[0026] As can be seen from the above technical solution, this utility model has the following beneficial effects:

[0027] This utility model provides a small oil atomizing spray gun. By setting the air passages into a set of air holes arranged in a ring, and then setting an air guide groove to guide the air in the air holes to the inner and outer sides of the ring isolation wall, the processing difficulty of the air passages can be reduced compared to processing two sets of air passages with different radial positions, thereby improving the economy of manufacturing small-sized spray guns. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of an oil atomizing spray gun according to one embodiment of this application;

[0029] Figure 2 This is a cross-sectional view of an oil atomizing spray gun according to an embodiment of this application;

[0030] Figure 3 for Figure 2 A magnified view of a portion of area A in the center circle;

[0031] Figure 4 for Figure 2 A magnified view of a portion of area B in the center circle;

[0032] Figure 5 This is a schematic diagram of the structure of the air barrier in one embodiment of this application (viewpoint 1);

[0033] Figure 6 This is a schematic diagram of the air barrier structure in one embodiment of this application (viewpoint 2);

[0034] Figure 7 This is a plan view of the spray gun tube in one embodiment of this application;

[0035] Figure 8 for Figure 7 A cross-sectional view along the CC direction;

[0036] Figure 9 This is a schematic diagram of the end cap structure in one embodiment of this application;

[0037] Figure 10 This is a schematic diagram of the adjustment knob in one embodiment of this application.

[0038] In the picture:

[0039] 1-Spray gun body; 110-Oil chamber; 1101-Oil inlet; 12-Air port; 120-Air chamber; 1201-Atomizing air port; 1202-Mounting countersunk hole; 13-Air guide groove; 130-Piston chamber; 1301-Switch air port; 131-First air guide groove; 132-Second air guide groove; 14-Detection hole;

[0040] 2- Nozzle assembly; 21- Oil outlet nozzle; 22- Air outlet cap; 220- Air outlet chamber;

[0041] 3-Gas barrier; 31-Annular isolation wall; 311-Annular flange; 32-Annular isolation plate; 321-Gas guide notch;

[0042] 4-Piston rod; 41-Pin; 411-Adjusting nut; 42-Cap; 43-Piston head; 430-Sliding cavity; 431-Limit edge; 44-Plug; 441-Conical head; 442-Second air-tight sealing ring; 45-Buffer spring; 46-Reset spring;

[0043] 5-Spacer; 50-Insertion hole; 501-Conical opening; 502-Annular air groove; 51-First air-tight sealing ring;

[0044] 6-Pantograph; 61-Sealing ring mounting groove; 611-Sliding sealing ring; 62-Intermediate section; 621-Annular groove; 622-Through hole; 623-Oil leakage hole; 624-Threaded connection section; 63-Sealing ring;

[0045] 7-End cap; 71-Threaded through hole; 72-Ventilation hole; 73-Limiting boss; 731-Limiting groove;

[0046] 8-Adjustment knob; 81-Knob body; 810-Rotation cavity; 8101-Storage slot; 82-Screw; 83-Limiting protrusion; 84-Helical spring. Detailed Implementation

[0047] Example 1

[0048] Combination Figure 1 , Figure 2 and Figure 8 An oil atomizing spray gun is shown, comprising:

[0049] The spray gun tube 1 is provided with an oil chamber 110, an air chamber 120 and a piston chamber 130 spaced apart axially, and an oil inlet 1101, an atomizing air inlet 1201 and a switching air inlet 1301 connected to the oil chamber 110, the air chamber 120 and the piston chamber 130 respectively.

[0050] The nozzle assembly 2 is installed at one end of the spray gun tube 1. The nozzle assembly 2 includes an oil outlet 21 and an air outlet cap 22. The air outlet cap 22 is fitted onto the oil outlet 21. The oil outlet hole of the oil outlet 21 is located inside the air outlet hole of the air outlet cap 22. An air outlet chamber 220 communicating with the air outlet hole of the air outlet cap 22 is provided between the oil outlet 21 and the air outlet cap 22. An air passage communicating with the air outlet chamber 120 and the air outlet chamber 220 is provided on the spray gun tube 1.

[0051] The air duct 3 is disposed in the air outlet chamber 220. The air duct 3 includes an annular isolation wall 31 disposed between the oil outlet nozzle 21 and the air outlet cap 22.

[0052] The piston rod 4 includes a piston head 43 slidably disposed in the piston chamber 130 and a pin 41 connected to the piston head 43. The front end of the pin 41 cooperates with the oil outlet hole of the oil outlet 21. Moving the piston rod 4 is used to switch the opening and closing state of the oil outlet 21.

[0053] The method of use is as follows: air is introduced into the switch vent 1301, causing the piston head 43 to drive the ejector pin 41 to move, thereby opening the oil outlet of the oil nozzle 21; oil and air are introduced into the oil inlet 1101 and the atomizing vent 1201 respectively, and the oil is ejected from the oil outlet through the oil chamber 110, while the gas is ejected from the gas outlet cap 22 through the gas chamber 120 and the gas outlet chamber 220 to atomize the oil. Among them, the gas baffle 3 is used to divide the gas entering the gas outlet chamber 220 into two annular nested inner and outer paths.

[0054] Furthermore, it also includes:

[0055] Spacer 5 is provided between the air chamber 120 and the piston chamber 130 to isolate the air chamber 120 and the piston chamber 130.

[0056] The diaphragm 6 is disposed between the oil cavity 110 and the air cavity 120 to isolate the oil cavity 110 and the air cavity 120.

[0057] Example 2

[0058] To ensure atomization, two air passages, one inside and one outside, need to be set in the air outlet chamber 220. For example, a food processing mold release oil gun disclosed in Chinese Utility Model Patent Application No. 2022233344931 uses an air baffle 3 to separate the gas from the air chamber 120 to the air outlet chamber 220 into two nested air passages. Corresponding to these two air passages, two sets of air holes connecting the air chamber 120 and the air outlet chamber 220 need to be machined on the spray gun tube 1. The openings of the two sets of air holes on the side near the air outlet chamber 220 correspond to the radial sides of the annular isolation wall 31, respectively.

[0059] In miniaturized spray guns (such as candy mold spray guns), the radial dimension of the spray gun tube 1 is too small, making it too difficult to machine two sets of holes with different radial positions, thus affecting manufacturing costs. Therefore, there is an urgent need to design a new flow channel scheme that connects the air chamber 120 and the air outlet chamber 220 to improve the economics of machining small-sized spray guns.

[0060] In this regard, further, in combination Figure 7 and Figure 8 As shown,

[0061] In this embodiment, a set of air guide grooves 13 are provided between the air outlet chamber 220 and the air passage. The air passage includes air holes 12 disposed in each air guide groove 13. All air holes 12 are arranged in a ring. The air holes 12 are connected to the air chamber 120. The air guide groove 13 includes a first air guide groove 131 and a second air guide groove 132. The first air guide groove 131 extends radially outward from the position of the air hole 12 to the radial outer side of the annular isolation wall 31. The second air guide groove 132 extends radially inward from the position of the air hole 12 to the radial inner side of the annular isolation wall 31.

[0062] By setting the air passages as a set of air holes 12 arranged in a ring, and then by setting the air guide groove 13 to guide the air in the air holes 12 to the inner and outer sides of the annular isolation wall 31, the processing difficulty of the air passages can be reduced compared to processing two sets of air passages with different radial positions, thereby improving the economy of manufacturing small-sized spray guns.

[0063] Furthermore, the air guide groove 13 is disposed on the end face of the spray gun tube body 1 near the air outlet chamber 220, and the annular isolation wall 31 is provided with an annular flange 311 at one axial end that abuts against the end of the spray gun tube body 1 near the air outlet chamber 220. The annular flange 311 covers the position of the air guide groove 13 corresponding to the air hole 12.

[0064] Based on the above structure, in this application, the air guide groove 13 is set on the spray gun tube body 1, which has the advantage of simple processing compared to setting the air guide groove 13 on the air isolation cover 3. The annular flange 311 is set to ensure that the first air guide groove 131 and the second air guide groove 132 respectively guide the air from the air hole 12 to both sides of the annular isolation wall 31, thereby ensuring the stability of the amount of air entering both sides of the annular isolation wall 31.

[0065] Furthermore, the number of air holes 12 in each air guide groove 13 is 1, the number of first air guide grooves 131 is 4, and the number of second air guide grooves 132 is 3;

[0066] Furthermore, as the air guide groove 13 extends radially from the position of the air hole 12, it also extends and widens laterally, such that the end of the air guide groove 13 away from the air hole 12 in the radial direction is wider than the other end.

[0067] Furthermore, in combination Figure 5 and Figure 6 As shown, the air shield 3 includes annular isolation plates 32 integrally disposed on the inner and outer sides of the annular isolation wall 31. The inner and outer annular isolation plates 32 are arranged axially. The annular isolation plates 32 are provided with a plurality of circumferentially arrayed air guide gaps 321. The air guide gaps 321 on the axially adjacent annular isolation plates 32 are staggered in the circumferential direction.

[0068] The annular baffle 32 is used to axially isolate the air outlet chamber 220 separated by the annular baffle wall 31. The air guide notches 321 on adjacent annular baffles 32 are staggered circumferentially, acting as a flow barrier to prevent excessive airflow. Traditionally, the connection between the annular baffle 32 and the air shield 3 is a partially nested structure, such as embedding the annular baffle 32 inside the annular baffle wall 31 into another insert within the air shield 3. This design affects the reduction of radial dimensions. This application uses a one-piece manufacturing process, eliminating the need for a limiting structure and improving miniaturization. In this embodiment, the air guide notch 321 includes an arc-shaped notch with an outer opening and a perforation.

[0069] Furthermore, in combination Figure 6 As shown, the end of the annular isolation wall 31 away from the annular flange 311 extends axially out of the end of the annular isolation plate 32.

[0070] This ensures that the air path ejected from the air guide gaps 321 on both the inner and outer sides is effectively divided.

[0071] Example 3

[0072] To save axial space, the traditional layout between the spacer 5 and the spacer 6 is often compact. However, in this application, with the radial dimension reduced, the traditional layout leads to unstable gas output.

[0073] Furthermore, in this embodiment, the spacer 5 and the diaphragm 6 are respectively disposed at both ends of the air cavity 120 axially, and the axial distance a between the spacer 5 and the diaphragm 6 is greater than 1 / 3 of the outer diameter d of the air cavity 120 by a / d.

[0074] In this embodiment, through adjustments and experiments, the axial distance between the spacer 5 and the diaphragm 6 was increased, thereby extending the axial space of the air chamber 120 and increasing its volume. While the radial dimension is reduced, extending the axial distance between the spacer 5 and the diaphragm 6 increases the buffer volume within the air chamber 120, thus mitigating the instability in the air output caused by fluctuations in the air source intake. Specifically, in this embodiment, a = 5.8 mm, d = 9 mm.

[0075] Example 4

[0076] Because the sliding sealing ring 611 is a consumable part, if the sliding sealing ring 611 is damaged and not detected in time, oil will leak into the air chamber 120, causing a malfunction.

[0077] In this regard, further, in combination Figure 4As shown, the diaphragm 6 has sealing ring mounting grooves 61 at both ends, and a sliding sealing ring 611 is installed in the sealing ring mounting groove 61. The ejector pin 41 slides through the sliding sealing ring 611. The sliding sealing ring 611 is used to seal the radial gap between the diaphragm 6 and the ejector pin 41. The diaphragm 6 includes an intermediate section 62 disposed between a pair of sealing ring mounting grooves 61 axially. The intermediate section 62 has a through hole 622 that fits with the ejector pin 41 with a clearance. The outer side of the intermediate section 62 has an annular groove 621. The annular groove 621 has a plurality of circumferentially arranged oil leakage holes 623 that communicate with the through hole 622. The side wall of the spray gun tube 1 has a detection hole 14, and the inner opening of the detection hole 14 is connected to the annular groove 621.

[0078] To detect damage to the sliding sealing ring 611 in advance, an oil leakage hole 623 and an annular groove 621 are provided on the intermediate section 62. When the sliding sealing ring 611 on the side near the oil cavity 110 is damaged, the oil will be guided to the annular groove 621 and then leak outward from the detection hole 14. Therefore, damage to the sliding sealing ring 611 on the side near the oil cavity 110 can be detected in a timely manner. Furthermore, due to the setting of the annular groove 621, even if the oil leakage hole 623 and the detection hole 14 are misaligned circumferentially, it can still be ensured that the oil can leak out from the detection hole 14, thereby reducing assembly precision requirements.

[0079] Furthermore, the air chamber 120 is provided with a countersunk hole 1202 at one end near the oil chamber 110, and the intermediate section 62 includes a threaded connection section 624. The threaded connection section 624 is disposed at the end of the annular groove 621 away from the oil chamber 110, and the threaded connection section 624 is threadedly connected to the countersunk hole 1202. The end of the diaphragm 6 near the oil chamber 110 abuts against the axial end face of the countersunk hole 1202. A sealing ring 63 is provided between the diaphragm 6 and the axial end face of the countersunk hole 1202, and the ejector pin 41 passes through the sealing ring 63. The sealing ring 63 is used to seal the axial gap between the diaphragm 6 and the countersunk hole 1202.

[0080] Example 5

[0081] Combination Figure 3 As shown, further, the piston rod 4 includes a plug 44, which is disposed at one end of the piston head 43 near the air chamber 120. The spacer 5 is provided with a hole 50 adapted to the plug 44. The end of the plug 44 away from the piston head 43 is provided with a conical head 441. The hole 50 is provided with a conical opening 501 adapted to the shape of the conical head 441. An annular air groove 502 is provided inside the hole 50. The annular air groove 502 is disposed at the end of the conical opening 501 away from the air chamber 120. The atomizing air hole 1201 is connected to the annular air groove 502. A second air-sealing ring 442 is embedded on the conical head 441.

[0082] When the piston rod 4 moves to close the oil outlet of the oil outlet 21, the conical head 441 abuts against the conical opening 501 to close the air passage between the air chamber 120 and the annular air groove 502.

[0083] When the piston rod 4 moves to open the oil outlet hole of the oil outlet 21, the conical head 441 separates from the conical opening 501 to open the air passage between the air chamber 120 and the annular air groove 502.

[0084] Therefore, the oil circuit and the atomizing gas circuit can be opened and closed synchronously when the moving piston rod 4 is moved. Among them, when the conical head 441 abuts against the conical opening 501, the second air-sealing ring 442 is used to seal the gap between the conical head 441 and the conical opening 501.

[0085] Furthermore, a first air-tight sealing ring 51 is provided radially between the plug 44 and the insertion hole 50. The first air-tight sealing ring 51 is located at the end of the annular air groove 502 away from the conical opening 501. The first air-tight sealing ring 51 is used to seal the gap between the plug 44 and the insertion hole 50.

[0086] Furthermore, the piston head 43 is provided with a sliding cavity 430, and the end of the ejector pin 41 away from the nozzle assembly 2 is slidably disposed in the sliding cavity 430. A buffer spring 45 is provided in the sliding cavity 430, and the buffer spring 45 abuts against the ejector pin 41 axially. The buffer spring 45 is used to apply a spring force to the ejector pin 41 toward the nozzle assembly 2. A limiting edge 431 is provided in the sliding cavity 430, and the ejector pin 41 is provided with a protrusion that axially cooperates with the limiting edge 431. The limiting edge 431 is used to limit the amount of movement of the ejector pin 41 relative to the piston head 43 toward the nozzle assembly 2. During the process of opening the oil outlet, the limiting edge 431 is used to pull the ejector pin 41 to move.

[0087] During the process of closing the oil outlet of the oil outlet 21, the ejector pin 41 compresses the buffer spring 45 by a preset distance.

[0088] In a traditional piston rod 4, the ejector pin 41 and piston head 43 are fixedly connected. This results in the ejector pin 41 making rigid contact with the oil outlet when closing the oil outlet port of the oil outlet nozzle 21, which can easily damage the oil outlet port over time. To address this, the above-described structure allows for elastic contact between the ejector pin 41 and the oil outlet port. Furthermore, the force exerted by the ejector pin 41 against the oil outlet port is the elastic force generated by the buffer spring 45, not the force of the entire piston rod 4 moving to reset. Therefore, this effectively mitigates the impact damage caused by the ejector pin 41 when closing the oil outlet port, thus improving its service life.

[0089] Furthermore, the protrusion includes an adjusting nut 411 threaded onto the ejector pin 41, and the buffer spring 45 abuts against the end of the adjusting nut 411 away from the limiting edge 431.

[0090] Furthermore, the number of adjusting nuts 411 is 2.

[0091] The adjusting nut 411, which abuts against the buffer spring 45, can adjust the elastic force applied by the buffer spring 45 to the ejector pin 41.

[0092] Furthermore, the sliding cavity 430 has an opening at the end away from the nozzle assembly 2, and the piston rod 4 also includes a cap 42 installed at the opening end of the sliding cavity 430, with the buffer spring 45 abutting between the cap 42 and the adjusting nut 411.

[0093] Furthermore, a return spring 46 is provided in the piston chamber 130. The return spring 46 abuts against the piston rod 4. The return spring 46 is used to apply an axial elastic force to the piston rod 4 in the direction of the nozzle assembly 2. The opening of the switch air hole 1301 on the piston chamber 130 is provided at the end of the piston chamber 130 near the air chamber 120.

[0094] When air enters through the vent 1301, the piston rod 4 moves until it opens the oil outlet of the nozzle 21. The return spring 46 is compressed and stores energy. Upon reset, the return spring 46 is released, pushing the piston rod 4 to close the oil outlet of the nozzle 21. This design has the advantage of simple control.

[0095] Example 6

[0096] Combination Figure 9 and Figure 10 As shown, the piston chamber 130 is further open at one end away from the nozzle assembly 2, and also includes an end cap 7. The end cap 7 is installed on the spray gun tube body 1 corresponding to the open end of the piston chamber 130. An adjustment knob 8 is threadedly connected to the end cap 7. The adjustment knob 8 includes a knob body 81 and a screw 82. The screw 82 is disposed on the knob body 81. The end cap 7 is provided with a threaded through hole 71. The screw 82 is installed in the threaded through hole 71. The knob body 81 is disposed on the outside of the end cap 7. The end of the screw 82 away from the knob body 81 extends into the piston chamber 130 and is directly opposite the piston rod 4 to limit the movement stroke of the piston rod 4.

[0097] Furthermore, the knob body 81 is provided with a rotating cavity 810 opening towards the end cover 7. The end cover 7 is provided with a limiting boss 73 near the adjusting knob 8. The threaded through hole 71 is provided on the limiting boss 73. The rotating cavity 810 is rotatably sleeved on the limiting boss 73. A limiting structure is provided radially between the limiting boss 73 and the rotating cavity 810.

[0098] The limiting structure is used to prevent loosening between the end cap 7 and the adjusting knob 8.

[0099] Furthermore, the limiting structure includes a limiting groove 731 arranged in a circumferential array on the side wall of the limiting boss 73, and a limiting protrusion 83 adapted to the limiting groove 731 is provided on the inner side wall of the rotating cavity 810. The limiting protrusion 83 elastically abuts against the limiting groove 731 in the radial direction.

[0100] Furthermore, the limiting protrusion 83 is rod-shaped, and the rotating cavity 810 is provided with a receiving groove 8101 for receiving the limiting protrusion 83. The knob body 81 is fitted with a spiral spring 84 on the outer side of the receiving groove 8101. The receiving groove 8101 radially penetrates the outer wall of the rotating cavity 810 so that the inner side of the spiral spring 84 abuts against the limiting protrusion 83. The side of the limiting protrusion 83 away from the spiral spring 84 is placed in the limiting groove 731.

[0101] During the rotation of the knob body 81, the limiting protrusion 83 moves sequentially within each limiting groove 731. Each time it moves out of the limiting groove 731, the limiting protrusion 83 moves radially outward, and the spiral spring 84 is stretched open to store energy. When the limiting protrusion 83 moves to be circumferentially opposite to the limiting groove 731, the spiral spring 84 contracts and resets, pressing the limiting protrusion 83 into the limiting groove 731. Therefore, each adjustment of the knob body 81 requires overcoming the elastic force of the spiral spring 84, thereby achieving a certain degree of circumferential limitation of the knob body 81 while adjusting the position of the screw 82 relative to the end cover 7, thus playing an anti-loosening role during use.

[0102] Furthermore, the end cap 7 is provided with a vent hole 72 that communicates with the piston chamber 130, and the vent hole 72 is axially inserted through the limiting boss 73.

[0103] During the movement of the piston head 43, the air pressure in the piston chamber 130 on the side of the piston head 43 away from the switch vent 1301 will change. By setting the vent 72, the air pressure can be balanced, avoiding the resistance caused by the air pressure change from affecting the sensitivity of controlling the movement of the piston rod 4. Based on the above structure, in this application, the outside air communicates with the piston chamber 130 through the gap between the rotating chamber 810 and the limiting boss 73 and the vent 72 to balance the air pressure. Since the limiting boss 73 is set in the rotating chamber 810, the opening of the vent 72 is covered by the rotating chamber 810, which can effectively isolate and prevent impurities from entering the vent 72.

[0104] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on the explanation herein, those skilled in the art can conceive of other specific embodiments of this utility model without creative effort, and these embodiments will all fall within the scope of protection of this utility model.

Claims

1. A small oil atomizing spray gun, comprising: The spray gun tube (1) is provided with an oil chamber (110) and an air chamber (120) spaced apart axially, and an oil inlet (1101) and an atomizing air hole (1201) connected to the oil chamber (110), the air chamber (120) and the piston chamber (130) respectively. The nozzle assembly (2) is installed at one end of the spray gun tube (1). The nozzle assembly (2) includes an oil outlet (21) and an air outlet cap (22). The air outlet cap (22) is fitted onto the oil outlet (21). The oil outlet hole of the oil outlet (21) is located inside the air outlet hole of the air outlet cap (22). An air outlet chamber (220) communicating with the air outlet hole of the air outlet cap (22) is provided between the oil outlet (21) and the air outlet cap (22). An air passage communicating with the air outlet chamber (120) and the air outlet chamber (220) is provided on the spray gun tube (1). The air hood (3) is disposed in the air outlet chamber (220). The air hood (3) includes an annular isolation wall (31) disposed between the oil outlet (21) and the air outlet cap (22). Its features are: A set of air guide grooves (13) is provided between the air outlet chamber (220) and the air passage. The air passage includes air holes (12) disposed in each air guide groove (13). All air holes (12) are arranged in a ring. The air holes (12) are connected to the air chamber (120). The air guide groove (13) includes a first air guide groove (131) and a second air guide groove (132). The first air guide groove (131) extends radially outward from the position of the air hole (12) to the radial outer side of the annular isolation wall (31). The second air guide groove (132) extends radially inward from the position of the air hole (12) to the radial inner side of the annular isolation wall (31).

2. A small oil misting lance according to claim 1, characterized in that: The air guide groove (13) is provided on the end face of the spray gun tube (1) near the air outlet chamber (220). The annular isolation wall (31) has an annular flange (311) at one end of its axial direction that abuts against the end of the spray gun tube (1) near the air outlet chamber (220). The annular flange (311) covers the position of the air guide groove (13) corresponding to the air hole (12).

3. A small oil misting lance according to claim 1, characterized in that: The number of air holes (12) in each air guide groove (13) is 1, and the number of the first air guide groove (131) is greater than the number of the second air guide groove (132).

4. A compact oil misting lance according to claim 1, wherein: As the air guide groove (13) extends radially from the position of the air hole (12), it also extends laterally and widens, such that the end of the air guide groove (13) away from the air hole (12) in the radial direction is wider than the other end.

5. A compact oil misting lance according to claim 1, wherein: The air hood (3) includes an annular isolation plate (32) integrally disposed on the inner and outer sides of the annular isolation wall (31). The inner and outer annular isolation plates (32) are arranged axially. The annular isolation plate (32) is provided with a number of circumferentially arrayed air guide gaps (321). The air guide gaps (321) on the axially adjacent annular isolation plates (32) are intersected in the circumferential direction.

6. A small oil misting lance according to claim 5, characterized in that: The end of the annular isolation wall (31) away from the annular flange (311) extends axially out of the end of the annular isolation plate (32).

7. A compact oil misting lance according to claim 1, wherein: Also includes: A piston chamber (130) and a switch air hole (1301) are provided on the spray gun tube (1). The piston chamber (130) is located on the side of the air chamber (120) away from the oil chamber (110). The switch air hole (1301) is connected to the piston chamber (130). The piston rod (4) includes a piston head (43) slidably disposed in the piston chamber (130) and a pin (41) connected to the piston head (43). The front end of the pin (41) is engaged with the oil outlet hole of the oil outlet (21). Moving the piston rod (4) is used to switch the opening and closing state of the oil outlet (21). Spacer (5) is provided between the air chamber (120) and the piston chamber (130) to isolate the air chamber (120) and the piston chamber (130). A diaphragm (6) is provided between the oil chamber (110) and the air chamber (120) to isolate the oil chamber (110) and the air chamber (120).

8. A small oil misting lance according to claim 7, characterized in that: The spacer (5) and the diaphragm (6) are respectively located at the two ends of the air cavity (120) axially. The axial distance a between the spacer (5) and the diaphragm (6) is greater than 1 / 3 of the outer diameter d of the air cavity (120).

9. A small oil misting lance according to claim 7, characterized in that: The diaphragm (6) has sealing ring mounting grooves (61) at both ends. A sliding sealing ring (611) is installed in the sealing ring mounting groove (61). The ejector pin (41) slides through the sliding sealing ring (611). The sliding sealing ring (611) is used to seal the radial gap between the diaphragm (6) and the ejector pin (41). The diaphragm (6) includes an intermediate section (62) located between a pair of sealing ring mounting grooves (61) in the axial direction. The intermediate section (62) has a through hole (622) that fits with the ejector pin (41) with a clearance. The outer side of the intermediate section (62) has an annular groove (621). The annular groove (621) has several circumferentially arranged oil leakage holes (623) that are connected to the through hole (622). The side wall of the spray gun tube (1) has a detection hole (14). The inner opening of the detection hole (14) is connected to the annular groove (621).

10. A small oil misting lance according to claim 9, characterized in that: The air chamber (120) is provided with a countersunk hole (1202) at one end near the oil chamber (110). The intermediate section (62) includes a threaded connection section (624). The threaded connection section (624) is located at one end of the annular groove (621) away from the oil chamber (110). The threaded connection section (624) is threadedly connected to the countersunk hole (1202). The end of the diaphragm (6) near the oil chamber (110) abuts against the axial end face of the countersunk hole (1202). A sealing ring (63) is provided between the diaphragm (6) and the axial end face of the countersunk hole (1202). The ejector pin (41) passes through the sealing ring (63).

Images