Valve structure of spray gun

Abstract

A valve structure of a spray gun comprises a gun body, a containing cavity is formed in the gun body, a material needle base is installed in the containing cavity, a material needle sleeve is arranged between the material needle base and the inner wall of the containing cavity, an opening communicated with the outside is formed in the rear end of the containing cavity, and internal threads are arranged on the side, close to the opening, of the containing cavity. An external thread matched with the internal thread is arranged on the outer side wall face of the rear end of the material needle sleeve, and the material needle sleeve is screwed into the containing cavity through the opening. According to the valve structure of the spray gun, external threads are arranged on the material needle sleeve, the material needle sleeve is screwed into the containing cavity through matching of internal threads and the external threads, sealing of the containing cavity and the material needle sleeve can be achieved, installation is convenient, and sealing is stable.

Description

Technical Field

[0001] This utility model relates to the field of spray gun technology, and in particular to a valve structure for a spray gun. Background Technology

[0002] The spray gun's valve is sealed from both ends. The valve structure is aligned linearly with the paint needle of the spray gun. Pressing the trigger moves the needle seat, opening the seal between the needle seat and the needle sleeve, allowing gas to flow forward. To achieve a sealed air passage, the needle seat is typically made of metal, while the needle sleeve is made of non-metallic material. The rear end is sealed by an angle, the front end of the needle seat and the needle sleeve are sealed by diameter, and the front end of the needle sleeve and the gun body are sealed by two sealing rings. The rear end is locked with a metal locking nut. However, this sealing method has the following drawbacks:

[0003] 1. The needle sleeve and the gun body use a double-end face seal, which can easily lead to difficulty in controlling the size;

[0004] 2. Metal tightening nuts can easily cause deformation of non-metallic needle sleeves, leading to seal failure. Utility Model Content

[0005] Technical problems to be solved

[0006] In view of this, the embodiments of this specification provide a valve structure for a spray gun that is easy and quick to install and provides a stable seal.

[0007] Technical solution

[0008] To solve the aforementioned technical problem, this utility model provides the following technical solution: a valve structure for a spray gun, including a gun body, a receiving cavity provided inside the gun body, a material needle seat installed in the receiving cavity, a material needle sleeve provided between the material needle seat and the inner wall of the receiving cavity, an opening communicating with the outside at the rear end of the receiving cavity, an internal thread provided on the side of the receiving cavity near the opening, an external thread provided on the outer wall surface of the rear end of the material needle sleeve that mates with the internal thread, and the material needle sleeve being screwed into the receiving cavity through the opening.

[0009] Compared with the prior art, the advantages of this utility model are: by using the internal and external threads to fit together, the needle sleeve can be screwed into the receiving cavity to achieve a seal between the receiving cavity and the needle sleeve, which is convenient to install and provides a stable seal.

[0010] In some embodiments, a sealing ring groove is provided on the outer wall of the front end of the needle sleeve, and a first sealing ring is placed in the sealing ring groove. Through the above improvement, the sealing between the front end of the needle sleeve and the gun body is strengthened by the setting of the first sealing ring, and the sealing performance is better.

[0011] In some embodiments, the receiving cavity includes a receiving portion and a threaded portion from front to back. An internal thread is provided at the threaded portion, and the diameter of the threaded portion is larger than the diameter of the receiving portion. A first blocking plane is provided on the needle sleeve, which is located in front of the internal thread. The first blocking plane abuts against the rear end face of the receiving portion, and a second sealing ring is provided between the first blocking plane and the rear end face of the receiving portion. With this improvement, when the needle sleeve is screwed into the receiving cavity, because the diameter of the threaded portion is larger than the diameter of the receiving portion, the end face of the receiving portion abuts against the external thread, preventing the needle sleeve from screwing in further. At the same time, the second sealing ring is pressed, resulting in better sealing between the rear end of the needle sleeve and the receiving cavity. In addition, the second sealing ring prevents the needle sleeve from excessively screwing in and rubbing against the wall of the receiving cavity, causing wear and extending the service life.

[0012] In some embodiments, a flange is formed on the outer side wall of the middle part of the needle seat facing outward, and a boss that mates with the flange is raised on the inner side wall of the needle sleeve facing inward. The flange abuts against the wall of the boss to achieve a seal. Through the above improvement, the seal is achieved by the flange abutting against the wall of the boss, and the seal fails by the flange and the boss moving away from each other, thereby achieving gas exchange.

[0013] In some embodiments, the flange includes a first inclined surface, and the boss includes a second inclined surface, with the first inclined surface abutting against the second inclined surface. This improvement enhances the sealing performance by having the first inclined surface abut against the second inclined surface.

[0014] In some embodiments, a needle adjustment seat is installed at the opening, and a clamping spring is provided between the needle adjustment seat and the flange. Through the improvement, the clamping spring prevents the seal between the flange and the boss from failing due to external force.

[0015] In some embodiments, the needle adjustment seat is provided with an adjustment thread that mates with the internal thread. Through this improvement, the needle adjustment seat can move inward and outward by adjusting the thread and the internal thread, making installation and adjustment convenient and quick.

[0016] In some embodiments, the needle holder is made of metal and the needle sleeve is made of non-metal. With the above improvement, the needle holder is made of metal, so the performance is minimally affected by changes in processing temperature and ambient temperature. By making the needle sleeve a non-metallic material, hard friction between the needle sleeve and the needle holder is prevented, resulting in a longer service life.

[0017] Beneficial effects

[0018] This utility model provides a valve structure for a spray gun. An external thread is provided at the rear section of the needle sleeve. Through the engagement of the internal and external threads, the needle sleeve is screwed into the receiving cavity, achieving a seal between the receiving cavity and the needle sleeve. This design is convenient to install and provides a stable seal. A first sealing ring is provided in the sealing ring groove at the front end of the needle sleeve to enhance the seal between the front end of the needle sleeve and the gun body. Because the diameter of the threaded portion is larger than the diameter of the receiving portion, the end face of the receiving portion abuts against the external thread, preventing the needle sleeve from screwing further inward. Simultaneously, it presses against the second sealing ring, resulting in better sealing between the rear end of the needle sleeve and the receiving cavity. Furthermore, the second sealing ring prevents the needle sleeve from excessively screwing in and rubbing against the wall of the receiving cavity, thus avoiding wear and extending the service life. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 It is a structural diagram of the utility model;

[0021] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0022] Figure 3 For the utility model Figure 2 A magnified structural diagram at point A;

[0023] Figure 4 This is a cross-sectional structural diagram of the gun body of this utility model;

[0024] Figure 5 This is a schematic diagram of the material needle sleeve of this utility model;

[0025] Figure 6 This is a cross-sectional view of the needle sleeve of this utility model;

[0026] Figure 7 This is a schematic diagram of the material needle adjustment seat of this utility model;

[0027] Figure 8 This is a schematic diagram of the material needle holder of this utility model.

[0028] In the diagram: 1. Gun body; 1.1. Receiving cavity; 1.1.1. Opening; 1.1.2. Receiving part; 1.1.3. Threaded part; 1.1.4. Stop block; 1.2. Internal thread; 2. Needle seat; 2.1. Flange; 2.2. First inclined surface; 3. Needle sleeve; 3.1. External thread; 3.2. Sealing ring groove; 3.3. First blocking plane; 3.4. Boss; 3.5. Second inclined surface; 4. First sealing ring; 5. Second sealing ring; 6. Needle adjusting seat; 6.1. Adjusting thread; 7. Clamping spring. Detailed Implementation

[0029] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0030] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one 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 aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0032] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The illustrations only show the components related to this application and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0033] Additionally, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that practice can be carried out without these specific details.

[0034] The technical solutions provided by the various embodiments of this application are described below with reference to the accompanying drawings.

[0035] Please see Figure 1-5 As shown in this embodiment: a valve structure for a spray gun includes a gun body 1, a receiving cavity 1.1 inside the gun body 1, a material needle seat 2 installed inside the receiving cavity 1.1, a material needle sleeve 3 disposed between the material needle seat 2 and the inner wall of the receiving cavity 1.1, an opening 1.1.1 communicating with the outside at the rear end of the receiving cavity 1.1, an internal thread 1.2 on the side of the receiving cavity 1.1 near the opening 1.1.1, an external thread 3.1 on the outer wall surface of the rear end of the material needle sleeve 3 that mates with the internal thread 1.2, and the material needle sleeve 3 being screwed into the receiving cavity 1.1 through the opening 1.1.1.

[0036] By engaging the internal thread 1.2 with the external thread 3.1, the needle sleeve 3 can be screwed into the receiving cavity 1.1 to achieve a seal between the receiving cavity 1.1 and the needle sleeve 3. This makes installation convenient and ensures a stable seal.

[0037] In some embodiments, as Figures 3-6 As shown, a sealing ring groove 3.2 is provided on the outer wall of the front end of the needle sleeve 3. The sealing ring groove 3.2 contains a first sealing ring 4. It should be noted that by setting the first sealing ring 4, the sealing between the front end of the needle sleeve 3 and the gun body 1 is strengthened, and the sealing performance is better.

[0038] In some embodiments, as Figure 6-Figure 8 As shown, the accommodating cavity 1.1 includes, from front to back, an accommodating portion 1.1.2 and a threaded portion 1.1.3. An internal thread 1.2 is located at the threaded portion 1.1.3, and the diameter of the threaded portion 1.1.3 is larger than the diameter of the accommodating portion 1.1.2. A first blocking plane 3.3 is located on the material needle sleeve 3, in front of the internal thread 1.2. The first blocking plane 3.3 abuts against the rear end face of the accommodating portion 1.1.2, and a space is provided between the first blocking plane 3.3 and the rear end face of the accommodating portion 1.1.2. With the second sealing ring 5, it should be noted that when the needle sleeve 3 is screwed into the receiving cavity 1.1, because the diameter of the threaded part 1.1.3 is larger than the diameter of the receiving part 1.1.2, the end face of the receiving part 1.1.2 abuts against the external thread 3.1, preventing the needle sleeve 3 from screwing in further. At the same time, the second sealing ring 5 is pressed, resulting in better sealing between the rear end of the needle sleeve 3 and the receiving cavity 1.1. In addition, the second sealing ring 5 prevents the needle sleeve 3 from excessively screwing in and rubbing against the wall of the receiving cavity 1.1, causing wear, and thus extending its service life.

[0039] In some embodiments, as Figure 3-Figure 8As shown, a flange 2.1 is formed on the outer side of the middle part of the needle holder 2, and a boss 3.4 that mates with the flange 2.1 is raised on the inner side of the needle sleeve 3. The flange 2.1 and the wall surface of the boss 3.4 abut against each other to achieve a seal. It should be noted that the seal is achieved by the flange 2.1 abutting against the wall surface of the boss 3.4, and the seal fails when the flange 2.1 and the boss 3.4 are relatively far apart, thereby realizing gas exchange.

[0040] In some embodiments, as Figure 3-Figure 8 As shown, flange 2.1 includes a first inclined surface 2.2, and boss 3.4 includes a second inclined surface 3.5. The first inclined surface 2.2 and the second inclined surface 3.5 abut against each other. It should be noted that the abutment between the first inclined surface 2.2 and the second inclined surface 3.5 enhances the sealing performance.

[0041] In some embodiments, as Figure 3-Figure 8 As shown, a needle adjustment seat 6 is installed at the opening 1.1.1. A clamping spring 7 is provided between the needle adjustment seat 6 and the flange 2.1. It should be noted that the clamping spring 7 is provided to prevent the seal between the flange 2.1 and the boss 3.4 from failing due to external force.

[0042] In some embodiments, as Figure 7 As shown, the needle adjustment seat 6 is provided with an adjustment thread 6.1 that mates with the internal thread 1.2. It should be noted that the needle adjustment seat 6 can move inward and outward by adjusting the thread 6.1 and the internal thread 1.2, making installation and adjustment convenient and quick.

[0043] In some embodiments, as Figure 3 As shown, the needle holder 2 is made of metal, while the needle sleeve 3 is made of non-metallic material. It should be noted that the needle holder 2 is made of metal, so changes in processing size, temperature, and ambient temperature have minimal impact on its performance. The needle sleeve 3 is made of non-metallic material to prevent hard friction between the needle sleeve 3 and the needle holder 2, resulting in a longer service life.

[0044] In some embodiments, as Figure 3-Figure 5 As shown, the inner sidewall of the front end of the accommodating cavity 1.1 has a stop block 1.1.4 protruding inward to prevent the needle sleeve 3 from dislodging from the accommodating cavity 1.1.

[0045] Working principle: The first sealing ring 4 is housed in the sealing ring groove 3.2, and the second sealing ring 5 is inserted from the inside to the outside into the needle sleeve 3. The needle sleeve 3 is screwed into the receiving cavity 1.1 through the opening 1.1.1, which presses the second sealing ring 5. The sealing between the rear end of the needle sleeve 3 and the receiving cavity 1.1 is better. At the same time, the setting of the second sealing ring 5 prevents the needle sleeve 3 from being excessively screwed in and rubbing against the wall of the receiving cavity 1.1, causing wear and extending its service life. Through the cooperation of the adjusting thread 6.1 and the internal thread 1.2 of the needle adjusting seat 6, the needle adjusting seat 6 is screwed into the receiving cavity 1.1. A clamping spring 7 is provided between the needle adjusting seat 6 and the flange 2.1, so that the flange 2.1 of the needle seat 2 abuts against the boss 3.4 of the needle sleeve 3. The clamping spring 7 applies a clamping force to the needle seat 2, thereby achieving a seal.

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

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

Claims

1. A valve structure for a spray gun, comprising a gun body (1), wherein the gun body (1) has a receiving cavity (1.1), characterized in that: a material needle seat (2) is installed in the receiving cavity (1.1), a material needle sleeve (3) is provided between the material needle seat (2) and the inner wall of the receiving cavity (1.1), and the rear end of the receiving cavity (1.1) has an opening communicating with the outside. 1.1.1), the receiving cavity (1.1) is provided with an internal thread (1.2) on the side near the opening (1.1.1), and the outer wall of the rear end of the needle sleeve (3) is provided with an external thread (3.1) that mates with the internal thread (1.2). The needle sleeve (3) is screwed into the receiving cavity (1.1) through the opening (1.1.1); A sealing ring groove (3.2) is provided on the outer wall of the front end of the needle sleeve (3), and a first sealing ring (4) is placed in the sealing ring groove (3.2); The accommodating cavity (1.1) includes a accommodating portion (1.1.2) and a threaded portion (1.1.3) from front to back. The internal thread (1.2) is located at the threaded portion (1.1.3). The diameter of the threaded portion (1.1.3) is larger than the diameter of the accommodating portion (1.1.2). The needle sleeve (3) is provided with a first blocking plane (3.3). The first blocking plane (3.3) is located on the front side of the internal thread (1.2). The first blocking plane (3.3) abuts against the rear end face of the accommodating portion (1.1.2). A second sealing ring (5) is provided between the first blocking plane (3.3) and the rear end face of the accommodating portion (1.1.2).

2. The valve structure of a spray gun according to claim 1, characterized in that: The outer side wall of the middle part of the needle seat (2) has a flange (2.1) formed outward, and the inner side wall of the needle sleeve (3) has a boss (3.4) that cooperates with the flange (2.1). The flange (2.1) and the wall of the boss (3.4) abut against each other to achieve a seal.

3. The valve structure of a spray gun according to claim 2, characterized in that: The flange (2.1) includes a first inclined surface (2.2), and the boss (3.4) includes a second inclined surface (3.5), with the first inclined surface (2.2) abutting against the second inclined surface (3.5).

4. The valve structure of a spray gun according to claim 3, characterized in that: A needle adjustment seat (6) is installed at the opening (1.1.1), and a clamping spring (7) is provided between the needle adjustment seat (6) and the flange (2.1).

5. The valve structure of a spray gun according to claim 4, characterized in that: The needle adjustment seat (6) is provided with an adjustment thread (6.1) that mates with the internal thread (1.2).

6. The valve structure of a spray gun according to claim 1, characterized in that: The needle holder (2) is made of metal, and the needle sleeve (3) is made of non-metal.

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