Feeding connector of spray gun

Abstract

A feeding connector of a spray gun comprises a metal connector body, the metal connector body comprises a head portion connected with a spray gun upper pot, a tail portion connected with a spray gun body and a middle portion, the two ends of the middle portion are connected with the head portion and the tail portion respectively, a vertically-through connecting hole is formed in the head portion, and a non-metal high polymer material is integrally formed in the metal connector body in an injection molding mode. The non-metal insert is sequentially provided with a sealing part, a connecting part and a filling part from top to bottom, the sealing part is arranged above the head part, the connecting part is arranged in the connecting hole, and the filling part is arranged in the groove in the middle. According to the feeding connector of the spray gun, when the feeding connector is used, the end face of a pot connector of an upper pot of the spray gun is matched with the sealing face of the sealing part, sealing is achieved, the non-metal insert and the inner wall of a feeding hole of a spray gun body are sealed, installation is convenient and fast, and meanwhile the groove of the metal connector body is filled with the filling part. Therefore, the lower section part of the non-metal insert is fuller, the tensile strength of the non-metal material is increased, and the stability is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of spray guns, in particular to a feed joint of a spray gun. Background Art

[0002] The upper pot of the spray gun is used to hold liquid spray materials (usually paint). In existing spray guns, the upper pot and the feed joint are screwed into the internal thread of the feed hole of the gun body to achieve a fixed connection between the upper pot and the feed joint and the gun body. The upper pot cooperates with the internal thread of the feed hole of the gun body through the pot joint thread, and at the same time, the pot joint end face of the upper pot is pressed against the end face of the feed joint to achieve a sealing effect. In a spray gun with this structure, the threads of the feed joint and the threads of the feed hole of the gun body are processed and formed separately, and there is a gap in the thread matching. As a result, after the upper pot and the feed joint are connected to the gun body, there is a deviation in the straightness and concentricity of the upper pot joint and the feed joint, causing the upper pot joint and the feed joint to not be tightly engaged, thus causing leakage.

[0003] Chinese invention CN107486364B discloses an integrated sealed feed connector, comprising a metal connector body, a groove formed in the head of the metal connector body, a non-metallic polymer material injection-molded into the groove to form a non-metallic insert, so that the non-metallic insert can be embedded in the head of the metal connector body; the top of the non-metallic insert protrudes from the head of the metal connector body, and the outer diameter of the non-metallic insert is consistent with the outer diameter of the metal connector body; the end face of the non-metallic insert serves as a sealing surface for mating with the end face of the pot connector of the upper pot; the non-metallic insert and the metal connector body are formed with external threads, and the external threads of the non-metallic insert and the external threads of the metal connector body form a continuous thread structure as the external thread of the feed connector. The present invention embeds a wear-resistant and sealing non-metallic insert in the head of the metal connector body, which can effectively prevent leakage, loss of the sealing ring, wear and other problems.

[0004] But the problem is that the non-metallic insert must be sealed with the inner wall of the pot joint of the upper pot, and also with the feed hole of the spray gun body. Four dimensions need to be controlled at the same time to achieve the sealing effect, which increases the difficulty of processing and the installation is more troublesome. The number of spare parts increases. At the same time, the non-metallic insert at the lower end of the feed joint is smaller in volume, resulting in a smaller tensile strength of the non-metallic column, which is prone to breakage, causing the non-metallic material to separate from the metal, thereby causing the feed joint to fail. Utility Model Content

[0005] Technical problems to be solved

[0006] In view of this, the embodiments of this specification provide a feed connector for a spray gun that is simple to manufacture, quick and easy to install, and highly stable.

[0007] Technical Solution

[0008] In order to solve the technical problems, the present invention provides the following technical solutions: a feed joint for a spray gun, comprising a metal joint body, the metal joint body comprising a head connected to the pot on the spray gun, a tail connected to the spray body of the spray gun, and a middle part with both ends respectively connected to the head and the tail, the head is provided with a connecting hole that passes through up and down, a non-metallic polymer material is integrally injection-molded into the metal joint body to form a non-metallic insert, the non-metallic insert is provided with a sealing part, a connecting part and a filling part from top to bottom, the sealing part is arranged above the head, the connecting part is arranged in the connecting hole, and the filling part is arranged in the groove in the middle; the outer diameter of the sealing part is consistent with the outer diameter of the metal joint body; the sealing part serves as a sealing surface that cooperates with the end face of the pot joint of the spray gun; threads are formed on the outer wall surfaces of the sealing part and the head, and the external thread of the sealing part and the external thread of the head form a continuous thread structure as the external thread of the feed joint.

[0009] Compared with the prior art, the advantages of the present invention are: non-metallic polymer wear-resistant material is injection-molded on the metal joint body, and when in use, the end face of the pot joint of the pot on the spray gun cooperates with the sealing surface of the sealing part to achieve sealing, and the non-metallic insert is sealed with the inner wall of the feed hole of the spray gun spray body, and the installation is convenient and quick. At the same time, the filling part of the non-metallic insert is filled in the groove of the metal joint body, making the lower section of the non-metallic insert fuller, increasing the tensile strength of the non-metallic material, and making it more stable.

[0010] In some embodiments, there are three connecting parts, and the three connecting parts are arranged at equal intervals around the central axis of the non-metallic insert. Through the improvement, the three connecting parts are distributed in a triangular shape, preventing relative shaking between the sealing part and the filling part, so that the non-metallic insert is more stable when injection molded into the metal joint body.

[0011] In some embodiments, a retaining ring is provided below the groove. Through the improvement, the provision of the retaining ring facilitates the shaping of the non-metallic insert and facilitates the determination of the position of the non-metallic insert on the metal joint body.

[0012] In some embodiments, a supporting boss protrudes outward from the wall surface of the lower section of the groove, and the supporting boss and the groove are arranged in a stepped manner. Through the above improvement, the stability of the non-metallic insert is further enhanced. The stepped arrangement can further enhance the rigidity of the non-metallic insert and prevent the non-metallic insert from deformation.

[0013] In some embodiments, the upper end surface of the sealing portion is an inverted cone surface that is larger on the outside and smaller on the inside. Through the improvement, the upper end surface of the sealing portion is an inverted cone surface that is larger on the outside and smaller on the inside, which narrows the contact surface between the sealing portion and the upper pot of the spray gun. Under a certain sealing force, its sealing pressure ratio is greatly increased, making it easier to achieve sealing.

[0014] In some embodiments, the external threads of the sealing part and the external threads of the head are machined at one time. Through the improvement, one-time molding makes the product highly stable and has a good sealing effect, and can improve the accuracy of concentricity and straightness, thereby greatly improving the performance and effect of the product.

[0015] In some embodiments, a sealing gasket is provided between the spray gun body and the tail portion. Through the above improvement, the sealing between the feed connector and the spray gun body is enhanced.

[0016] Beneficial effects

[0017] The utility model provides a feed joint for a spray gun. When in use, the end face of the pot joint of the pot on the spray gun cooperates with the sealing surface of the sealing part to achieve sealing. The non-metallic insert is sealed with the inner wall of the feed hole of the spray gun body, and the installation is convenient and quick.

[0018] The filling part of the non-metallic insert is filled in the groove of the metal joint body, making the lower part of the non-metallic insert fuller, increasing the tensile strength of the non-metallic material and making it more stable;

[0019] The metal joint body and the non-metallic insert are matched together, which has both good rigidity and good toughness, and plays a good sealing effect. It can avoid the adverse effect of hard contact sealing caused by both being made of metal materials. The longer the metal material and the non-metallic polymer material are in contact, the tighter the seal will be and the better the effect will be.

[0020] At the same time, the external thread of the sealing part and the external thread of the head form a continuous thread structure to be connected to the spray gun pot. The sealing part adopts wear-resistant non-metallic polymer material, so repeated disassembly of the spray gun pot will not cause wear. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0022] Figure 1 It is a structural diagram of the utility model;

[0023] Figure 2 This is a cross-sectional structural principle diagram of the utility model;

[0024] Figure 3 For the utility model Figure 2 A schematic diagram of the enlarged structure at point A;

[0025] Figure 4 This is a schematic structural diagram of the feed connector of the present invention;

[0026] Figure 5 This is a schematic cross-sectional view of the feed connector of the present invention;

[0027] Figure 6 This is a schematic structural diagram of the metal joint body of the present utility model;

[0028] Figure 7 This is a schematic structural diagram of the metal joint body of the present invention from another angle;

[0029] Figure 8 This is a structural diagram of the non-metallic insert of the present utility model.

[0030] In the figure: 1. Spray gun upper pot; 2. Spray gun body; 3. Feed joint; 3.1. Metal joint body; 3.1.1. Head; 3.1.1.1. Connecting hole; 3.1.2. Middle part; 3.1.2.1. Groove; 3.1.2.2. Retaining ring; 3.1.2.3. Support boss; 3.1.3. Tail; 3.2. Non-metallic insert; 3.2.1. Sealing part; 3.2.1.1. Inverted cone surface; 3.2.2. Connecting part; 3.2.3. Filling part; 4. Sealing gasket. DETAILED DESCRIPTION

[0031] The present application is described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] The following describes the embodiments of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the features in the following embodiments and embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of this application.

[0033] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on this application, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspect described herein can be used to implement an apparatus and / or practice a method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this apparatus and / or practice this method.

[0034] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The illustrations only show components related to the present application and are not drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated.

[0035] Additionally, in the following description, specific details are provided to provide a thorough understanding of the examples, however, one skilled in the art will appreciate that the examples can be practiced without these specific details.

[0036] The following describes the technical solutions provided by various embodiments of the present application in conjunction with the accompanying drawings.

[0037] See also Figure 1-8 In this embodiment, a feed connector for a spray gun is provided, comprising a metal connector body 3.1, the metal connector body 3.1 comprising a head 3.1.1 connected to the upper pot 1 of the spray gun, a tail 3.1.3 connected to the spray gun body 2, and a middle portion 3.1.2 with the head 3.1.1 and the tail 3.1.3 connected at both ends. The head 3.1.1 is provided with a connecting hole 3.1.1.1 extending vertically therethrough. A non-metallic polymer material is integrally injection-molded into the metal connector body 3.1 to form a non-metallic insert 3.2. The non-metallic insert 3.2 is provided with a sealing portion 3.2.1, a connecting portion 3.2.2, and a filling portion 3.2.3 from top to bottom. The sealing portion 3.1.1 is provided with a connecting hole 3.1.1.1 extending vertically therethrough. 2.1 is arranged above the head 3.1.1, the connecting part 3.2.2 is arranged in the connecting hole 3.1.1.1, and the filling part 3.2.3 is arranged in the groove 3.1.2.1 of the middle part 3.1.2; the outer diameter of the sealing part 3.2.1 is consistent with the outer diameter of the metal joint body 3.1; the sealing part 3.2.1 serves as a sealing surface that cooperates with the end face of the pot joint of the pot 1 on the spray gun; threads are formed on the outer wall surfaces of the sealing part 3.2.1 and the head 3.1.1, and the external thread of the sealing part 3.2.1 and the external thread of the head 3.1.1 form a continuous thread structure as the external thread of the feed joint 3; the tail 3.1.3 of the metal joint body 3.1 serves as the discharge port.

[0038] A non-metallic polymer wear-resistant material is injection-molded on the metal joint body 3.1. When in use, the pot joint end face of the pot 1 on the spray gun cooperates with the sealing surface of the sealing part 3.2.1 to achieve sealing. The non-metallic insert 3.2 is sealed with the inner wall of the feed hole of the spray gun spray body 2. The installation is convenient and quick. At the same time, the filling part 3.2.3 of the non-metallic insert 3.2 is filled in the groove 3.1.2.1 of the metal joint body 3.1, making the lower section of the non-metallic insert 3.2 fuller, increasing the tensile strength of the non-metallic material and making it more stable.

[0039] In some embodiments, as Figure 6-Figure 8 As shown, there are three connecting parts 3.2.2, and the three connecting parts 3.2.2 are arranged at equal intervals around the central axis of the non-metallic insert 3.2. It should be noted that the three connecting parts 3.2.2 are distributed in a triangular shape to prevent relative shaking between the sealing part 3.2.1 and the filling part 3.2.3, so that the non-metallic insert 3.2 is more stable when injection molded into the metal joint body 3.1.

[0040] In some embodiments, as Figure 6 As shown, a retaining ring 3.1.2.2 is provided below the groove 3.1.2.1. It should be noted that the provision of the retaining ring 3.1.2.2 facilitates the shaping of the non-metallic insert 3.2 and facilitates the determination of the position of the non-metallic insert 3.2 on the metal joint body 3.1.

[0041] In some embodiments, as Figure 6 As shown, a supporting boss 3.1.2.3 protrudes outward from the wall surface of the lower section of the groove 3.1.2.1. The supporting boss 3.1.2.3 and the groove 3.1.2.1 are arranged in a stepped manner. It should be noted that the stability of the non-metallic insert 3.2 is further enhanced. The stepped arrangement can further enhance the rigidity of the non-metallic insert 3.2 and prevent the non-metallic insert 3.2 from deformation.

[0042] In some embodiments, as Figure 8 As shown, the upper end surface of the sealing part 3.2.1 is an inverted cone surface 3.2.1.1 that is larger on the outside and smaller on the inside. It should be noted that the upper end surface of the sealing part 3.2.1 is an inverted cone surface 3.2.1.1 that is larger on the outside and smaller on the inside, which narrows the contact surface between the sealing part 3.2.1 and the upper pot 1 of the spray gun. Under a certain sealing force, its sealing specific pressure is greatly increased, making it easier to achieve sealing.

[0043] In some embodiments, as Figure 4-Figure 8 As shown, the external thread of the sealing part 3.2.1 and the external thread of the head 3.1.1 are machined at one time. It should be noted that the one-time molding makes the product highly stable and has a good sealing effect.

[0044] In some embodiments, as Figure 3As shown, a sealing gasket 4 is provided between the spray gun body 2 and the tail portion 3.1.3. It should be noted that the sealing between the feed connector 3 and the spray gun body 2 is enhanced.

[0045] Working principle: The internal thread of the spray gun body 2 is simultaneously connected with the external thread of the feed joint 3 and the external thread of the pot joint of the spray gun upper pot 1, thereby realizing a fixed connection between the spray gun upper pot 1 and the feed joint 3 and the spray gun body 2; the inverted cone surface 3.2.1.1 of the non-metallic insert 3.2 cooperates with the end face of the pot joint of the spray gun upper pot 1; the tail 3.1.3 of the feed joint 3 is screwed into the interior of the spray gun body 2, and a sealing gasket 4 is provided between the feed joint 3 and the spray gun body 2 to realize sealing between the feed joint 3 and the spray gun body 2.

[0046] The same or similar parts between the various embodiments in this specification can be referred to each other, and each embodiment focuses on the differences from other embodiments.

[0047] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A feed connector for a spray gun, comprising a metal connector body (3.1), characterized in that: The metal joint body (3.1) comprises a head (3.1.1) connected to the spray gun pot (1), a tail (3.1.3) connected to the spray gun body (2), and a middle part (3.1.2) with two ends respectively connected to the head (3.1.1) and the tail (3.1.3). The head (3.1.1) is provided with a connecting hole ( 3.1.1.1), the metal joint body (3.1) is integrally injection-molded with a non-metallic polymer material to form a non-metallic insert (3.2), the non-metallic insert (3.2) is provided with a sealing portion (3.2.1), a connecting portion (3.2.2) and a filling portion (3.2.3) from top to bottom, the sealing portion (3.2.1) is provided above the head portion (3.1.1), the connecting portion (3.2.2) is provided in the connecting hole (3.1.1.1), and the filling portion (3.2.3) is provided in the groove (3.1.2.1) of the middle portion (3.1.2); The outer diameter of the sealing portion (3.2.1) is consistent with the outer diameter of the metal joint body (3.1); The sealing portion (3.2.1) serves as a sealing surface that cooperates with the end surface of the pot joint of the pot (1) on the spray gun; Threads are formed on the outer wall surfaces of the sealing portion (3.2.1) and the head portion (3.1.1), and the external thread of the sealing portion (3.2.1) and the external thread of the head portion (3.1.1) form a continuous thread structure, serving as the external thread of the feed connector (3).

2. A feed connector for a spray gun according to claim 1, characterized in that: There are three connecting parts (3.2.2), and the three connecting parts (3.2.2) are arranged at equal intervals around the central axis of the non-metallic insert (3.2).

3. The feed connector for a spray gun according to claim 1, characterized in that: A retaining ring (3.1.2.2) is provided below the groove (3.1.2.1).

4. The feed connector for a spray gun according to claim 1, characterized in that: A supporting boss (3.1.2.3) protrudes outwards from the wall surface of the lower section of the groove (3.1.2.1), and the supporting boss (3.1.2.3) and the groove (3.1.2.1) are arranged in a step-like manner.

5. The feed connector for a spray gun according to claim 1, characterized in that: The upper end surface of the sealing portion (3.2.1) is an inverted cone surface (3.2.1.1) that is larger on the outside and smaller on the inside.

6. The feed connector for a spray gun according to claim 1, characterized in that: The external thread of the sealing part (3.2.1) and the external thread of the head (3.1.1) are machined at one time.

7. The feed connector for a spray gun according to claim 1, characterized in that: A sealing gasket (4) is provided between the spray gun body (2) and the tail portion (3.1.3).

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