Liquid inlet valve and spray gun for polyurethane foam joint mixture

Abstract

The liquid inlet valve of the polyurethane foam joint mixture comprises a valve body, a liquid inlet channel and a liquid outlet channel which are arranged in a staggered mode are arranged in the valve body, the liquid inlet channel can be communicated with the liquid outlet channel to form a liquid passing channel, the liquid passing channel is communicated with the liquid inlet channel, and the liquid passing channel is communicated with the liquid outlet channel. And a pullable sealing valve rod device capable of opening or closing the liquid passing channel is mounted in the middle of the valve body. The sealing valve rod device capable of being pulled is transversely arranged in the middle of the liquid inlet valve, the purpose of opening or closing the foaming agent inlet is achieved through movement of the transversely-arranged sealing valve rod capable of being pulled, meanwhile, even if residual foaming agents are completely solidified and then are bonded, the sealing valve rod can be pulled through external force to open the foaming agent inlet again, and therefore the foaming agent inlet is opened again. The bonding problem after the foaming agent is cured is effectively solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of polyurethane foam sealant spray guns, in particular to a liquid inlet valve and a spray gun for the polyurethane foam sealant. Background Art

[0002] In recent years, with the increasing popularity of polyurethane foam sealant applications at home and abroad, the quality of the spray guns used with it has also been getting better and better, especially the airtightness of the spray gun has been continuously improved. The liquid inlet valve (also called an adapter), as an important component connecting the spray gun and the polyurethane foam sealant, has also received more and more attention. For example, the Chinese patent with publication number CN201454781U, entitled "An adapter for a polyurethane foam sealant spray gun", and the Chinese patent with publication number CN203737471U, entitled "An anti-adhesion adapter", respectively made useful attempts and improvements to the anti-curing and anti-adhesion of the foam agent from the aspects of the material and structure of the sealing ball, and better solved the technical problem of adhesion in the early stage of foam curing. However, for the adhesion problem in the middle and late stages of foam curing, after the foam agent is completely cured, the technical solutions of the above two patents still cannot effectively solve it. Summary of the Invention

[0003] In order to overcome the deficiencies in the prior art, the utility model provides a liquid inlet valve for a polyurethane foam sealant, which can restart the foam agent inlet by external force, thereby solving the problem of adhesion caused by the residual foam agent after it is completely solidified.

[0004] The utility model also provides a spray gun equipped with the above-mentioned liquid inlet valve, which can also restart the foaming agent inlet through external force to solve the problem of adhesion caused by the residual foaming agent being completely solidified.

[0005] The technical solution adopted in this utility model is:

[0006] A liquid inlet valve for polyurethane foam sealant includes a valve body, wherein the valve body is provided with a liquid inlet channel and a liquid outlet channel arranged in an offset manner, the liquid inlet channel can be connected with the liquid outlet channel to form a liquid passage, and a pullable sealing valve stem device capable of opening or closing the liquid passage is installed in the middle of the valve body.

[0007] Furthermore, a mounting portion is provided on the valve body, a connecting hole is provided in the mounting portion and is connected to the liquid inlet channel and the liquid outlet channel, and the pullable sealing valve stem device is transversely arranged at the connecting hole.

[0008] Furthermore, the pullable sealing valve stem device includes a pullable sealing valve stem, which is installed in a laterally movably manner in the connecting hole, a valve stem seal is provided between the pullable sealing valve stem and the outer end of the connecting hole, and an elastic member is provided between the valve stem seal and the inner end of the pullable sealing valve stem.

[0009] Furthermore, the inner end of the pullable sealing valve stem has a tapered switch portion that can open or close the liquid passage.

[0010] Furthermore, a sealing ring is provided between the conical switch portion and the communicating hole to prevent the foaming agent from entering the gap of the elastic member and reduce the resetting resistance of the elastic member.

[0011] Furthermore, the outer end of the pullable sealing valve stem is provided with a protruding mounting portion having a pulling portion.

[0012] Furthermore, an opening adjustment sleeve capable of adjusting the opening of the pullable sealing valve stem is threadedly connected to the outer ring of the mounting portion, and the pullable sealing valve stem is inserted into the opening adjustment sleeve.

[0013] Furthermore, an elastic circlip is provided on one side of the pullable sealing valve stem close to the pulling portion, and the elastic circlip is located on the inner side of the opening adjustment sleeve.

[0014] Furthermore, a surface of the pullable sealing valve stem exposed outside the opening adjustment sleeve is provided with a scale or color marking area to indicate the opening of the pullable sealing valve stem.

[0015] A spray gun comprises a gun body with a grip, a sealing device, a trigger, a barrel, a gun nozzle, an ejector device, and an ejector opening adjustment and locking device. The barrel and gun nozzle are sequentially mounted at the front end of the gun body. A trigger is hingedly connected to the middle portion of the gun body. The ejector device is press-fitted through the gun body, trigger, and barrel via the ejector opening adjustment and locking device and is linked by the trigger. An inlet valve for the polyurethane foam sealant is mounted on the gun body.

[0016] The beneficial effects of the utility model are as follows: a pullable sealing valve stem device is horizontally arranged in the middle of the liquid inlet valve, and the purpose of opening or closing the foam agent inlet is achieved by moving the horizontally placed pullable sealing valve stem. At the same time, even if the residual foam agent is completely solidified and sticks, the sealing valve stem can be pulled by external force to reopen the foam agent inlet, which effectively solves the problem of sticking after the foam agent is solidified. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a cross-sectional view of the first embodiment of the present utility model in a closed state;

[0018] Figure 2 This is a cross-sectional view of the second embodiment of the present utility model in a closed state;

[0019] Figure 3 This is a cross-sectional view of the second embodiment of the present utility model in an open state;

[0020] Figure 4 This is a cross-sectional view of the third embodiment of the present utility model in an open state;

[0021] Figure 5 This is a cross-sectional view of the third embodiment of the present invention in a closed and locked state;

[0022] Figure 6 It is a schematic diagram of an embodiment of the utility model applied to a spray gun.

[0023] In the figure: 1-valve body; 1a-liquid inlet channel; 1b-liquid outlet channel; 1c-mounting part; 1d-connecting hole; 2, 2'-pullable sealing valve stem; 2a, 2'a-pulling part; 2'b-sealing ring; 2c, 2'c-conical switch part; 3-valve stem seal; 4-elastic part; 5-opening adjustment sleeve; 6-elastic retaining ring; 7-gun body; 8-sealing device; 9-trigger; 10-barrel; 11-gun nozzle; 12-thimble device; 13-thimble opening adjustment and locking device. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to specific embodiments, but the present invention is not limited to these specific embodiments. Those skilled in the art should recognize that the present invention encompasses all possible alternatives, improvements, and equivalents within the scope of the claims.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "multiple" means two or more, unless otherwise clearly defined.

[0026] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0027] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0028] Example 1

[0029] like Figure 1 The present embodiment provides a liquid inlet valve for a polyurethane foam sealant, comprising a valve body 1, wherein the valve body 1 is provided with a liquid inlet channel 1a and a liquid outlet channel 1b arranged in an offset manner, wherein the liquid inlet channel 1a can be connected with the liquid outlet channel 1b to form a liquid passage, and a pullable sealing valve stem device capable of opening or closing the liquid passage is installed in the middle of the valve body 1.

[0030] Specifically, the valve body 1 of this embodiment is provided with a mounting portion 1c, and a connecting hole 1d is provided in the mounting portion 1c, which is connected with the liquid inlet channel 1a and the liquid outlet channel 1b, and the pullable sealing valve stem device is horizontally arranged at the connecting hole 1d.

[0031] The pull-seal valve stem device described in this embodiment includes a pull-seal valve stem 2, which is laterally movable and mounted within a communication hole 1d. A valve stem seal 3 is disposed between the outer end of the pull-seal valve stem 2 and the communication hole 1d, and an elastic member 4 is disposed between the valve stem seal 3 and the inner end of the pull-seal valve stem 2. The elastic member 4 may be a spring. The inner end of the pull-seal valve stem 2 has a tapered switch portion 2c that can open or close the fluid passage. The outer end of the pull-seal valve stem 2 protrudes from the mounting portion 1c and has a pull portion 2a. The pull portion 2a may have a concave or corrugated structure to facilitate manual operation.

[0032] During use, the tapered switch portion 2c of the pullable sealing valve stem 2, under the elastic force of the elastic member 4, presses against the inner surface of the liquid inlet channel 1a, forming an initial seal. When the polyurethane foam bottle is installed on the liquid inlet valve, the internal pressure of the foam bottle pushes the pullable sealing valve stem 2 open, allowing the foam to flow further toward the offset liquid outlet channel 1b and into the spray gun. When the foam is exhausted and the polyurethane foam bottle is removed from the liquid inlet valve, the offset arrangement of the liquid inlet channel 1a prevents the foam in the liquid inlet valve from directly spraying back, thereby preventing accidental injury to the user.

[0033] After use, the pushable sealing valve stem 2 can press against the inner side surface of the liquid inlet channel under the elastic force of the elastic member 4 to achieve complete locking and sealing.

[0034] When the residual foaming agent on the outside of the liquid inlet channel solidifies, the liquid inlet valve inlet can be reopened by pulling the pullable sealing valve stem 2 outward through the pulling portion 2a of the pullable sealing valve stem 2, so that the spray gun can be reused.

[0035] The utility model disposes a pullable sealing valve stem device transversely in the middle part of the liquid inlet valve, and realizes the purpose of opening or closing the foam agent inlet by moving the transverse pullable sealing valve stem. At the same time, even if the residual foam agent is completely solidified and sticks, the sealing valve stem can be pulled by external force to reopen the foam agent inlet, which effectively solves the problem of sticking after the foam agent is solidified.

[0036] Example 2

[0037] like Figure 2 、 Figure 3 As shown, the difference between this embodiment and the first embodiment is that a sealing ring 2'b is provided between the conical switch portion 2'c and the communicating hole 1d to prevent the foaming agent from entering the gap of the elastic member 4 and reduce the reset resistance of the elastic member 4.

[0038] The remaining structures and functions are the same as those in the first embodiment.

[0039] Example 3

[0040] like Figure 4 、 Figure 5 As shown, this embodiment differs from the second embodiment in that an opening adjustment sleeve 5 is threaded onto the outer ring of the mounting portion 1c, which adjusts the opening of the pull-seal valve stem 2'. The pull-seal valve stem 2' is inserted into the opening adjustment sleeve 5. An elastic circlip 6 is provided on the side of the pull-seal valve stem 2' near the pulling portion 2'a. The elastic circlip 6 is located inside the opening adjustment sleeve 5. The surface of the pull-seal valve stem 2' exposed outside the opening adjustment sleeve 5 is provided with a scale or color-coded area to indicate the opening of the pull-seal valve stem 2'.

[0041] After use, the opening adjustment sleeve 5 is adjusted inwards, and the tapered switch portion 2'c of the movable sealing valve stem 2' is pressed tightly against the inner side of the liquid inlet channel 1a through the elastic circlip 6 to achieve complete locking and sealing.

[0042] When residual foaming agent solidifies on the outer side of the liquid inlet channel 1a, the opening adjustment sleeve 5 is adjusted outward to a state where the pullable sealing valve stem 2' can be opened at any time. The pullable sealing valve stem 2' can be pulled outward through the pulling portion 2'a of the pullable sealing valve stem 2' to reopen the liquid inlet valve inlet, so that the spray gun can be reused.

[0043] The remaining structures and functions are the same as those in the second embodiment.

[0044] Example 4

[0045] like Figure 6 As shown, this embodiment provides a spray gun, including a gun body 7 with a handle, a sealing device 8, a trigger 9, a barrel 10, a gun nozzle 11, a ejector device 12, and an ejector opening adjustment and locking device 13. The barrel 10 and the gun nozzle 11 are sequentially mounted on the front end of the gun body 7, and the trigger 9 is hinged to the middle of the gun body 7. The ejector device 12 is press-fitted into the gun body 7, the trigger 9 and the barrel 10 through the ejector opening adjustment and locking device 13, and is linked by the trigger 9; the gun body 7 is equipped with a liquid inlet valve for the polyurethane foam sealant described in Example 1, 2 or 3.

[0046] The spray gun of the utility model is provided with a pullable sealing valve stem device horizontally in the middle of the liquid inlet valve, and the foam agent inlet is opened or closed by the movement of the horizontally placed pullable sealing valve stem. At the same time, even if the residual foam agent is completely solidified and causes adhesion, the sealing valve stem can be pulled by external force to reopen the foam agent inlet, which effectively solves the adhesion problem after the foam agent is solidified.

Claims

1. A liquid inlet valve for a polyurethane foam sealant, comprising a valve body, wherein the valve body is provided with a liquid inlet channel and a liquid outlet channel arranged in a staggered manner, wherein the liquid inlet channel can be connected to the liquid outlet channel to form a liquid passage, and wherein: A pullable sealing valve stem device capable of opening or closing the liquid passage is installed in the middle of the valve body.

2. The liquid inlet valve for polyurethane foam sealant according to claim 1, characterized in that: The valve body is provided with a mounting portion, and a communicating hole which is in communication with the liquid inlet channel and the liquid outlet channel is provided in the mounting portion. The pullable sealing valve stem device is transversely arranged at the communicating hole.

3. The liquid inlet valve for polyurethane foam sealant according to claim 2, characterized in that: The pullable sealing valve stem device includes a pullable sealing valve stem, which is installed in a connecting hole so as to be laterally movable. A valve stem seal is provided between the pullable sealing valve stem and the outer end of the connecting hole, and an elastic member is provided between the valve stem seal and the inner end of the pullable sealing valve stem.

4. The liquid inlet valve for polyurethane foam sealant according to claim 3, characterized in that: The inner end of the pullable sealing valve stem is provided with a tapered switch portion which can open or close the liquid passage.

5. The liquid inlet valve for polyurethane foam sealant according to claim 4, characterized in that: A sealing ring is provided between the conical switch portion and the communicating hole.

6. The liquid inlet valve for polyurethane foam sealant according to claim 3, characterized in that: The outer end of the pullable sealing valve stem is provided with a protruding mounting portion and has a pulling portion.

7. The liquid inlet valve for polyurethane foam sealant according to claim 3, characterized in that: An opening adjustment sleeve capable of adjusting the opening of the pullable sealing valve stem is threadedly connected to the outer ring of the mounting portion, and the pullable sealing valve stem is inserted into the opening adjustment sleeve.

8. The liquid inlet valve for polyurethane foam sealant according to claim 7, characterized in that: An elastic circlip is provided on one side of the pullable sealing valve stem close to the pulling portion, and the elastic circlip is located on the inner side of the opening adjustment sleeve.

9. The liquid inlet valve for polyurethane foam sealant according to claim 8, characterized in that: The surface of the pullable sealing valve stem exposed outside the opening adjustment sleeve is provided with a scale or color identification area.

10. A spray gun comprising a gun body with a grip, a sealing device, a trigger, a barrel, a nozzle, an ejector assembly, and an ejector opening adjustment and locking device, wherein the barrel and nozzle are sequentially mounted at the front end of the gun body, a trigger is hingedly connected to the middle portion of the gun body, and the ejector assembly is press-fitted through the gun body, trigger, and barrel via the ejector opening adjustment and locking device, and is linked by the trigger; characterized in that: The gun body is equipped with a liquid inlet valve for the polyurethane foam sealant according to any one of claims 1 to 9.

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