Fluid reverse pumping valve and hot melt glue gun

Abstract

The utility model discloses a fluid reverse pumping valve and a hot melt glue gun. The fluid reverse pumping valve comprises a valve body and a movable part, a containing cavity and a glue injection cavity are defined by the valve body, and the glue injection cavity is communicated with the valve body to form a glue inlet and a glue outlet; the movable part comprises a movable part and a sealing part, the movable part is arranged in the containing cavity, the sealing part is arranged in the glue injection cavity, the movable part divides the containing cavity into a first cavity and a second cavity, the first cavity is communicated with the valve body to form a first air inlet, and the second cavity is communicated with the valve body to form a second air inlet; the movable part moves along a first direction relative to the valve body through the first air inlet, so that the sealing part opens the glue outlet, the sealing part is located at a first position, and the movable part moves along a second direction relative to the valve body through the second air inlet, so that the sealing part closes the glue outlet, and the sealing part is located at a second position. According to the fluid reverse pumping valve, the glue outlet can be opened and closed in real time, glue liquid is prevented from dripping, and the glue injection effect is improved. The hot melt glue gun with the fluid reverse pumping valve also has the advantages.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of fluid back -and -forth valve, especially to a kind of fluid back -and -forth valve and hot melt glue gun. BACKGROUND

[0002] In the related art, the existing hot melt glue gun cannot close the glue outlet in time during glue injection, resulting in that part of glue will leak from the glue outlet and drop after the glue injection step is completed, affecting the glue injection effect. UTILITY MODEL CONTENTS

[0003] The utility model at least solves one of the technical problems in the prior art. To this end, the utility model provides a fluid back-and-forth valve, which can open and close the glue outlet in real time, avoid glue dripping and improve the glue injection effect.

[0004] The utility model further provides a hot melt glue gun with the above fluid back-and-forth valve.

[0005] According to the fluid back-and-forth valve of the first aspect embodiment of the utility model, the valve body and the movable part are included.

[0006] The valve body defines a separated accommodating cavity and a glue injection cavity, and the glue injection cavity is communicated with the valve body to form a glue inlet and a glue outlet. The movable part includes a movable part and a sealing part connected thereto. The movable part is arranged in the accommodating cavity, and the sealing part is arranged in the glue injection cavity. The movable part separates the accommodating cavity to form a first chamber and a second chamber. The first chamber is communicated with the valve body to form a first air inlet, and the second chamber is communicated with the valve body to form a second air inlet. The first air inlet and the second air inlet are arranged separately. The sealing part can be moved relative to the valve body to switch between a first position and a second position. The movable part moves relative to the valve body along a first direction through the first air inlet, so that the sealing part opens the glue outlet, and the sealing part is in the first position. The movable part moves relative to the valve body along a second direction through the second air inlet, so that the sealing part closes the glue outlet, and the sealing part is in the second position. The first direction and the second direction are opposite.

[0007] The fluid back-pumping valve has at least the following beneficial effects: the accommodating cavity is divided into the first chamber and the second chamber by the movable part, so that when gas is input to the first air inlet or the second air inlet, the movable part can move in a specified direction and drive the sealing part to change position, thereby achieving switch control of the glue outlet, which can not only open and close the glue outlet in real time to avoid dripping of glue, but also improve the precision of glue application and simplify the structure of the fluid back-pumping valve.

[0008] According to some embodiments of the utility model, the fluid back-pumping valve further includes an elastic member, the elastic member is accommodated in the second chamber and connected to the valve body and the movable part, the elastic member is arranged between the movable part and the valve body along the first direction, and the elastic member is pressed by the movable part.

[0009] According to some embodiments of the utility model, one side of the movable part towards the elastic member is recessed to form a groove structure along the second direction, part of the elastic member is accommodated in the groove structure and abuts against the inner wall of the groove structure.

[0010] According to some embodiments of the utility model, the sealing part includes a sealing end, the sealing end is movable relative to the valve body to open or close the glue outlet, and the sealing end is arranged outside the glue injection chamber.

[0011] According to some embodiments of the utility model, the movable part includes a first sealing sheet and a second sealing sheet, the first sealing sheet is connected to one side of the movable part towards the first chamber, the first sealing sheet is curved along the second direction and abuts against the inner wall of the valve body, the second sealing sheet is connected to one side of the movable part towards the second chamber, and the second sealing sheet is curved along the first direction and abuts against the inner wall of the valve body.

[0012] According to some embodiments of the utility model, the valve body includes an upper cover, a connecting piece and a support connected together, the connecting piece is arranged between the upper cover and the support along the first direction, the upper cover and the connecting piece jointly define the accommodating cavity, and the support and the connecting piece jointly define the glue injection chamber.

[0013] According to some embodiments of the utility model, the inside of the connecting piece defines a sealing channel, the sealing channel is communicated with both ends of the connecting piece along the first direction and the second direction respectively, the sealing channel is communicated between the second chamber and the glue injection chamber, the sealing part is arranged in the sealing channel and abuts against the inner wall of the sealing channel.

[0014] According to some embodiments of the present application, a first recess is formed on one side of the connecting member facing the upper cover in a first direction, the first recess is arranged around the sealing passage, and the fluid back-pumping valve further comprises a first sealing member arranged in the first recess and abutting against the outer wall of the sealing part.

[0015] According to some embodiments of the present application, a second recess is formed on one side of the connecting member facing the support in a second direction, the second recess is arranged around the sealing passage, and the fluid back-pumping valve further comprises a second sealing member arranged in the second recess and abutting against the outer wall of the sealing part.

[0016] The hot melt glue gun according to the second aspect of the present application comprises a glue applying assembly and the fluid back-pumping valve according to any one of the above embodiments.

[0017] The glue applying assembly defines a glue inlet passage and a glue applying passage in communication with each other, the fluid back-pumping valve is connected to the glue applying assembly, the glue inlet is in communication with the glue inlet passage, and the sealing part is movable relative to the valve body to connect or separate the glue outlet and the glue applying passage.

[0018] The hot melt glue gun according to the present application has at least the following beneficial effects: the opening and closing of the glue outlet are controlled by the movement of the sealing part relative to the valve body, when the hot melt glue gun needs to apply glue, the glue outlet and the glue applying passage are connected to allow the glue to flow out through the glue outlet and the glue applying passage, and when the hot melt glue gun needs to stop applying glue, the glue outlet and the glue applying passage are separated to prevent the glue from flowing out. Thus, the hot melt glue gun can be opened and closed in real time, and the dripping of the glue is avoided.

[0019] Additional aspects and advantages of the present application will be given in part in the following description, will become apparent from the following description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0020] The present application will be further described below in combination with the drawings and embodiments, in which:

[0021] Figure 1 FIG. 1 is a schematic view of a fluid back-pumping valve according to an embodiment of the present application;

[0022] Figure 2 FIG. 3 is a sectional view of A-A of the fluid back-pumping valve according to the embodiment of the present application; Figure 1

[0023] Figure 3 FIG. 5 is a schematic view of a valve body according to an embodiment of the present application;

[0024] Figure 4 ​It is a schematic view of the fluid back-pumping valve in the embodiment of the utility model;

[0025] Figure 5 It is a schematic view of the fluid back-pumping valve in the embodiment of the utility model;

[0026] Figure 6 It is the enlarged view of B in the embodiment of the utility model Figure 2

[0027] Figure 7 It is a schematic view of the hot melt glue gun in the embodiment of the utility model;

[0028] Figure 8 It is a schematic view of the hot melt glue gun in the embodiment of the utility model.

[0029] Reference signs:

[0030] Fluid back-pumping valve 100, valve body 110, upper cover 111, accommodating cavity 1110, first chamber 1112, first air inlet 11121, second chamber 1113, second air inlet 11131, connecting piece 112, sealing channel 1121, first sink 1122, second sink 1123, support 113, glue injection cavity 1131, glue inlet 1132, glue outlet 1133;

[0031] Movable part 120, movable part 121, groove structure 1211, sealing part 122, sealing end 1221, first sealing sheet 123, second sealing sheet 124, elastic part 130, first sealing part 140, second sealing part 150;

[0032] Hot melt glue gun 10, glue coating assembly 200, glue inlet channel 210, glue coating channel 220. DETAILED DESCRIPTION

[0033] The embodiments of the utility model are described in detail below, and the examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the utility model, and cannot be understood as limiting the utility model.

[0034] In the description of the utility model, it is understood that the orientation description, such as up, down, front, back, left, right and the like, is based on the orientation or position relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, a specific orientation and operation, therefore, it cannot be understood as limiting the utility model.

[0035] ​In the description of the utility model, if several meanings are more than one, the meaning of multiple is more than two, greater than, less than, more than, etc. Understand as not including the number, above, below, within, etc. Understand as including the number. If there is a description to the first, second, it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0036] In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installation, connection should be understood broadly, and the person skilled in the art can determine the specific meaning of the above words in the utility model in combination with the specific content of the technical scheme.

[0037] In the description of the utility model, the description of reference terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable way.

[0038] The fluid back-pumping valve of the first aspect embodiment of the utility model and the hot melt glue gun of the second aspect embodiment are described below with reference to the drawings of the specification. It should be noted that, for the convenience of understanding and description, the downward direction is indicated as the first direction, and the downward direction is indicated as the second direction. The first direction and the second direction are opposite.

[0039] The utility model first aspect embodiment provides a fluid back-pumping valve 100 for gluing, refer to Figures 1 to 3As shown, the fluid back-pumping valve 100 comprises a valve body 110 and a movable member 120. The valve body 110 has an inner portion defining a receiving cavity 1110 and a glue injection cavity 1131. The glue injection cavity 1131 has a glue inlet 1132 and a glue outlet 1133 formed in the outer wall of the valve body 110 and separated from each other. The receiving cavity 1110 is used to accommodate the movable member 120 and provide a gas environment required for driving the movable member 120 to move. The glue injection cavity 1131 is used to store glue to be applied and output the glue. When the movable member 120 moves in the receiving cavity 1110, the air pressure in the receiving cavity 1110 will change. The separation of the receiving cavity 1110 and the glue injection cavity 1131 can avoid the backflow of the glue in the glue injection cavity 1131 due to the change of the air pressure in the receiving cavity 1110 during the glue application process. That is, even if the air pressure in the receiving cavity 1110 changes, the glue in the glue injection cavity 1131 will not be affected, thereby ensuring the sealing of the glue outlet 1133 and the accurate control of the amount of glue.

[0040] The movable member 120 comprises a movable part 121 and a sealing part 122 connected to each other. The movable part 121 is arranged in the receiving cavity 1110 and is responsible for responding to the change of the pressure from the outside, while the sealing part 122 is arranged in the glue injection cavity 1131 and is used to control the opening and closing of the glue outlet 1133. The movable part 121 divides the receiving cavity 1110 into a first chamber 1112 and a second chamber 1113. The first chamber 1112 has a first air inlet 11121 formed in the outer wall of the valve body 110, and the second chamber 1113 has a second air inlet 11131 formed in the outer wall of the valve body 110. The two chambers are respectively communicated with the outside through the first air inlet 11121 and the second air inlet 11131. Thus, the fluid back-pumping valve 100 can selectively supply air to the first air inlet 11121 or the second air inlet 11131 to control the movement of the movable part 121 in the receiving cavity 1110.

[0041] Specifically, since the sealing part 122 is connected to the movable part 121, the sealing part 122 will move with the movable part 121 relative to the valve body 110 to switch between the first position and the second position. Referring to Figure 5 As shown, the fluid back-pumping valve 100 will input air into the first chamber 1112 through the first air inlet 11121. The movable part 121 will move downward under the driving of the air pressure, which will cause the sealing part 122 to open the glue outlet 1133. At this time, the sealing part 122 is in the first position. The glue can be output from the glue outlet 1133 for glue application. Referring toFigure 4 As shown, the fluid backflow valve 100 can input gas into the second chamber 1113 through the second air inlet 11131. The movable part 121 can move upward under the drive of the air pressure, and the sealing part 122 is abutted to the valve body 110 to close the glue outlet 1133. At this time, the sealing part 122 is in the second position, and the glue liquid cannot be output from the glue outlet 1133 to be stored in the glue injection cavity 1131. The embodiment realizes the rapid opening and closing of the glue outlet 1133 through the bidirectional control mode, thereby avoiding the glue liquid from overflowing from the glue outlet 1133 to cause dripping after the glue coating operation is completed, and affecting the glue coating effect.

[0042] The fluid backflow valve 100 of the embodiment of the utility model separates the containing cavity 1110 into the first chamber 1112 and the second chamber 1113 through the movable part 121, so that when the gas is input into the first air inlet 11121 or the second air inlet 11131, the movable part 121 can move in the specified direction and drive the sealing part 122 to change the position, thereby realizing the on-off control of the glue outlet 1133. Not only can the glue outlet 1133 be opened and closed in real time to avoid the dripping of the glue liquid, but also the precision of the glue coating operation is improved, and the structure of the fluid backflow valve 100 is simplified. Moreover, the separation of the containing cavity 1110 and the glue injection cavity 1131 can effectively avoid the phenomenon that the glue liquid flows backward due to the pressure fluctuation of the first chamber 1112 or the second chamber 1113 in the glue coating process. The separation of the containing cavity 1110 and the glue injection cavity 1131 can also reduce the mutual interference between the components and improve the stability of the glue coating process.

[0043] In some embodiments, as shown in Figure 2 , Figure 4 and Figure 5 , the fluid backflow valve 100 further comprises an elastic member 130. The elastic member 130 is arranged in the second chamber 1113, and the two ends of the elastic member 130 are connected to the valve body 110 and the movable part 121 respectively. The elastic member 130 is arranged between the movable part 121 and the valve body 110 in the downward direction. The elastic member 130 is pressed by the movable part 121 and has a tendency to restore to the original state. Therefore, the elastic member 130 can exert a force on the movable part 121, so that the movable part 121 has a tendency to move upward. In the embodiment of the utility model, the upward movement of the movable part 121 drives the sealing part 122 to close the glue outlet 1133. Therefore, when it is needed to close the glue outlet 1133, the elastic member 130 cooperates with the air pressure of the second chamber 1113 to jointly drive the movable part 121 to move upward to close the glue outlet 1133, thereby improving the speed of closing the glue outlet 1133 and avoiding the dripping of the glue liquid due to the failure of the glue outlet 1133 to close in time after the glue coating is completed, and affecting the glue coating effect. Moreover, the elastic member 130 is conducive to maintaining the close contact between the sealing part 122 and the glue outlet 1133, thereby ensuring the good sealing performance.

[0044] Furthermore, in some embodiments, see [reference] Figure 2 , Figure 4 and Figure 5 As shown, the movable part 121 is recessed upwards on the side facing the elastic member 130 to form a groove structure 1211. Part of the elastic member 130 is housed within the groove structure 1211 and abuts against the inner wall of the groove structure 1211. This increases the contact area between the elastic member 130 and the movable part 121, making the pressure on the elastic member 130 more uniform, thereby improving the stability of the thrust applied by the elastic member 130 to the movable part 121 and enhancing the mechanical performance of the fluid backflow valve 100. Furthermore, the groove structure 1211 reduces the space required for the connection and assembly of the elastic member 130 and the movable part 121, thus reducing the volume of the fluid backflow valve 100. Simultaneously, the groove structure 1211 can limit the movement of the elastic member 130, preventing it from shifting or misaligning during long-term use, and protects the elastic member 130 from external interference, improving the safety and durability of the fluid backflow valve 100.

[0045] In some embodiments, see Figure 4 and Figure 5 As shown, the sealing part 122 includes a sealing end 1221, which is one end of the sealing part 122. The sealing end 1221 is located outside the glue injection cavity 1131 and can move relative to the valve body 110 along with the sealing part 122 to open or close the glue outlet 1133. The sealing end 1221 is used to keep the glue outlet 1133 closed when glue application is not required, preventing the glue in the glue injection cavity 1131 from flowing out of the glue outlet 1133. When glue application is required, the glue outlet 1133 is opened in time to ensure that the glue in the glue injection cavity 1131 can be smoothly output through the glue outlet 1133.

[0046] Specifically, when the sealing part 122 is in the first position, the sealing end 1221 is separated from the valve body 110 and moved away from the outer wall of the glue injection cavity 1131 to open the glue outlet 1133. When the sealing part 122 is in the second position, the sealing end 1221 is in contact with the valve body 110, and the sealing end 1221 is tightly attached to the edge of the glue outlet 1133 to close the glue outlet 1133. This embodiment ensures that the connection between the sealing end 1221 and the valve body 110 directly corresponds to the position change of the sealing part 122 to open or close the glue outlet 1133, thereby achieving efficient control of the glue outlet 1133. In this embodiment, by arranging the sealing end 1221 outside the glue injection cavity 1131, not only is the internal structure of the fluid backflow valve 100 simplified, reducing the mutual interference between components and components, but also the maintenance convenience is improved, and the user can more easily check and clean the sealing end 1221 and the surrounding area. Moreover, arranging the sealing end 1221 outside the glue injection cavity 1131 can also avoid the erosion of the sealing end 1221 by the glue, prolonging the service life of the sealing end 1221.

[0047] In some embodiments, referring to Figures 2 to 6 As shown, the movable part 120 further comprises a first sealing piece 123 and a second sealing piece 124 arranged separately. The first sealing piece 123 is arranged in the first chamber 1112, and one end of the first sealing piece 123 is connected to the side of the movable part 121 facing the first chamber 1112, and the other end is bent in the upward direction (i.e. consistent with the movement direction of the sealing part 122 when closing the glue outlet 1133) to abut against the inner wall of the valve body 110. The second sealing piece 124 is arranged in the second chamber 1113, and one end of the second sealing piece 124 is connected to the side of the movable part 120 facing the second chamber 1113, and the other end is bent in the downward direction (i.e. consistent with the movement direction of the sealing part 122 when opening the glue outlet 1133) to abut against the inner wall of the valve body 110.

[0048] Specifically, in this embodiment, the first sealing sheet 123 and the second sealing sheet 124 are structural components with elasticity, when the first sealing sheet 123 and the second sealing sheet 124 are bent to abut against the inner wall of the valve body 110, the first sealing sheet 123 and the second sealing sheet 124 have a tendency to restore to the original state, thereby exerting elastic force to the inner wall of the valve body 110, so as to be closely attached to the inner wall of the valve body 110, and the sealing performance of the first chamber 1112 and the second chamber 1113 is enhanced. Since the movable part 121 separates the accommodating cavity 1110 to form the first chamber 1112 and the second chamber 1113, the fluid suction valve 100 can input gas into the first chamber 1112 or the second chamber 1113, and drive the movable part 121 and the sealing part 122 to move in the downward direction or the upward direction by using the pressure difference of the gas, so as to achieve the opening and closing of the glue outlet 1133. Therefore, by arranging the first sealing sheet 123 and the second sealing sheet 124, an additional sealing layer is provided for the first chamber 1112 and the second chamber 1113, which can avoid the leakage of the gas in the first chamber 1112 to the second chamber 1113 or the leakage of the gas in the second chamber 1113 to the first chamber 1112 when the movable part 121 moves relative to the valve body 110, and affect the movement of the movable part 121, and reduce the opening and closing speed of the glue outlet 1133.

[0049] In addition, since the movable part 121 needs to move downward when the glue outlet 1133 is opened, and needs to move upward when the glue outlet 1133 is closed, the bending directions of the first sealing sheet 123 and the second sealing sheet 124 are arranged in opposite directions, which can ensure that the first sealing sheet 123 and the second sealing sheet 124 can provide good sealing effect for the first chamber 1112 and the second chamber 1113 when the movable part 121 moves downward or upward, and further ensure the accuracy and stability of the fluid suction valve 100 in the glue application process.

[0050] In some embodiments, referring to Figures 1 to 3 As shown in the figure, the valve body 110 includes an upper cover 111, a connecting piece 112 and a support 113 which are connected in sequence from top to bottom. The interiors of the upper cover 111, the connecting piece 112 and the support 113 all have hollow structures, so that the upper cover 111 and the connecting piece 112 jointly define the accommodating cavity 1110, and the support 113 and the connecting piece 112 jointly define the glue injection cavity 1131. By arranging the connecting assembly of the upper cover 111, the connecting piece 112 and the support 113, the assembly process of the valve body 110 is simplified, the sealing performance between the accommodating cavity 1110 and the glue injection cavity 1131 is ensured, and sufficient space is provided for installing the movable part 120 and related components.

[0051] In this embodiment, the first air inlet 11121 and the second air inlet 11131 are formed on the outer wall of the upper cover 111. The glue inlet 1132 is formed on the outer wall of the support 113, and the connecting member 112 is arranged between the upper cover 111 and the support 113 in the vertical direction. The outer wall of the connecting member 112 is provided with a plurality of sealing rings, which respectively abut against the inner walls of the upper cover 111 and the support 113, so that the connecting member 112 is tightly connected to the upper cover 111 and the support 113 respectively, thereby ensuring good sealing performance of the accommodating cavity 1110 and the glue injection cavity 1131. Moreover, the connecting member 112 can define the boundaries of the accommodating cavity 1110 and the glue injection cavity 1131, and ensure that the accommodating cavity 1110 and the glue injection cavity 1131 are strictly separated, thereby avoiding pressure interference between the accommodating cavity 1110 and the glue injection cavity 1131.

[0052] Further, in some embodiments, referring to Figures 2 to 5 As shown, the connecting member 112 is internally provided with a sealing channel 1121, which penetrates through both ends of the connecting member 112 along the downward direction and the upward direction, so as to communicate the second cavity 1113 and the glue injection cavity 1131. The sealing part 122 is arranged in the sealing channel 1121 and tightly abuts against the inner wall of the sealing channel 1121, thereby forming an effective sealing barrier. Since the sealing part 122 needs to open or close the glue outlet 1133 following the movement of the movable part 121, the sealing part 122 needs to be partially arranged in the accommodating cavity 1110 and partially arranged in the glue injection cavity 1131. By arranging the sealing channel 1121, the sealing part 122 can be switched between the first position and the second position while ensuring good sealing performance between the accommodating cavity 1110 and the glue injection cavity 1131, thereby avoiding the phenomenon that the glue in the glue injection cavity 1131 flows backward due to the change of the air pressure in the accommodating cavity 1110, or the gas in the accommodating cavity 1110 leaks into the glue injection cavity 1131 and affects the response speed of the sealing part 122.

[0053] In some embodiments, referring to Figures 2 to 5As shown, the fluid backflow valve 100 further comprises a first sealing member 140. The connecting member 112 of the fluid backflow valve 100 is recessed downwardly at a side of the upper cover 111 to form a first recessed groove 1122, which is arranged around the sealing channel 1121 and at a communication position between the second chamber 1113 and the sealing channel 1121. The first recessed groove 1122 is used to accommodate and fix the first sealing member 140. When the sealing part 122 is arranged in the sealing channel 1121, the first sealing member 140 is arranged around the sealing part 122 and tightly adheres to the outer wall of the sealing part 122, thereby separating the sealing channel 1121 and the second chamber 1113. The first sealing member 140 seals the connection position between the sealing part 122 and the sealing channel 1121, so as to avoid that, when the sealing part 122 moves in the sealing channel 1121, the gas in the second chamber 1113 leaks into the glue injection chamber 1131 through the sealing channel 1121 to affect the moving speed of the sealing part 122, so that the sealing part 122 cannot timely close the glue outlet 1133 and further avoid the phenomenon that the pressure change of the second chamber 1113 causes the glue in the glue injection chamber 1131 to flow backward, thereby affecting the sealing effect of the fluid backflow valve 100 in closing the glue outlet 1133.

[0054] The embodiment can reduce the assembly volume of the first sealing member 140 and the connecting member 112 by arranging the first recessed groove 1122, thereby reducing the overall volume of the fluid backflow valve 100. When the first sealing member 140 is accommodated in the first recessed groove 1122, the inner wall of the first recessed groove 1122 can limit the first sealing member 140. When the sealing part 122 is arranged in the sealing channel 1121, the first sealing member 140 is clamped between the inner wall of the first recessed groove 1122 and the outer wall of the sealing part 122, so that the first sealing member 140 cannot deviate from the position and cannot seal.

[0055] Similarly, in some embodiments, referring to Figures 2 to 5 As shown, the fluid backflow valve 100 further comprises a second sealing member 150. The connecting member 112 is recessed upwardly at a side of the support 113 to form a second recessed groove 1123, which is arranged around the sealing channel 1121. The second recessed groove 1123 is used to accommodate the second sealing member 150, and the second sealing member 150 has a similar function as the first sealing member 140, i.e., abutting against the outer wall of the sealing part 122 to enhance the sealing effect. The second sealing member 150 is arranged at a communication position between the glue injection chamber 1131 and the sealing channel 1121, and the second sealing member 150 provides additional sealing effect at the communication position between the glue injection chamber 1131 and the sealing channel 1121, so as to ensure good sealing performance even under high pressure difference.

[0056] In this embodiment, the assembly volume of the second seal 150 and the connector 112 can be reduced by arranging the second groove 1123, thereby reducing the overall volume of the fluid backflow valve 100. Meanwhile, the position of the second seal 150 can be prevented from deviating and failing to seal by the second groove 1123. Moreover, the sealing performance of the sealing passage 1121 can be effectively improved by the second groove 1123 and the second seal 150. When the sealing part 122 is in the second position, the air pressure of the second chamber 1113 is greater than that of the glue injection chamber 1131 and the first chamber 1112. The gas in the second chamber 1113 can be further prevented from leaking to the glue injection chamber 1131 through the sealing passage 1121 by the second seal 150, thereby affecting the closing effect of the glue outlet 1133, or preventing the glue in the glue injection chamber 1131 from flowing back to the second chamber 1113 due to the change of the air pressure in the containing chamber 1110.

[0057] The utility model discloses a second aspect novel embodiment provides a kind of hot melt glue gun 10 for gluing, refer to Figures 1 to 8 As shown in the figure, the hot melt glue gun 10 comprises a glue applying assembly 200 and the fluid backflow valve 100 described in any of the above embodiments. The glue applying assembly 200 defines a glue inlet channel 210 and a glue applying channel 220 in communication with each other. The fluid backflow valve 100 is connected to the glue applying assembly 200, and the glue inlet 1132 is in communication with the glue inlet channel 210. The sealing part 122 is arranged between the glue outlet 1133 and the glue applying channel 220, and the sealing part 122 can move in the downward direction or the upward direction relative to the valve body 110 to make the glue outlet 1133 and the glue applying channel 220 communicate, or to make the glue outlet 1133 and the glue applying channel 220 separate.

[0058] Specifically, when gluing is needed, glue is input from the glue inlet channel 210 to the glue injection chamber 1131, and then air is supplied to the first air inlet 11121 to make the movable part 121 and the sealing part 122 move downward, thereby opening the glue outlet 1133. At this time, the glue outlet 1133 and the glue applying channel 220 are in communication, and the glue flows through the glue outlet 1133 to the glue applying channel 220 to realize the gluing operation. When the gluing is completed, air is supplied to the second air inlet 11131 to make the movable part 121 and the sealing part 122 move upward, thereby closing the glue outlet 1133. At this time, the sealing part 122 separates the glue outlet 1133 and the glue applying channel 220, so that the glue cannot flow from the glue injection chamber 1131 to the glue applying channel 220 through the glue outlet 1133, thereby realizing the closing of the hot melt glue gun 10.

[0059] The hot melt glue gun 10 is moved relative to the valve body 110 through the sealing part 122 to control opening and closing of the glue outlet 1133, when the hot melt glue gun 10 needs to glue, the glue outlet 1133 and the glue applying channel 220 are communicated, so that glue can flow out through the glue outlet 1133 and the glue applying channel 220, when the hot melt glue gun 10 needs to stop gluing, the glue outlet 1133 and the glue applying channel 220 are separated, and the glue flowing out is hindered. Thus, the hot melt glue gun 10 is realized in real-time opening and closing, and dripping of the glue is avoided.

[0060] The utility model has been described in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge range possessed by ordinary skilled in the art without departing from the purpose of the utility model. In addition, the embodiments and the features in the embodiments of the utility model can be combined with each other without conflict.

Claims

1. A fluid backset valve, characterized by, The fluid backflow valve comprises: a valve body defining a separated accommodating cavity and a glue injection cavity, the glue injection cavity being communicated with the valve body to form a glue inlet and a glue outlet; a movable element comprising a movable part and a sealing part connected with each other, the movable part being arranged in the accommodating cavity, the sealing part being arranged in the glue injection cavity, the movable part separating the accommodating cavity to form a first chamber and a second chamber, the first chamber being communicated with the valve body to form a first air inlet, the second chamber being communicated with the valve body to form a second air inlet, the first air inlet and the second air inlet being arranged separately; the sealing part being movable relative to the valve body to switch between a first position and a second position, wherein the movable part moves relative to the valve body along a first direction through the first air inlet to make the sealing part open the glue outlet, the sealing part being in the first position, the movable part moves relative to the valve body along a second direction through the second air inlet to make the sealing part close the glue outlet, the sealing part being in the second position, the first direction being opposite to the second direction.

2. The fluid anti-suckback valve of claim 1, wherein The fluid backflow valve further comprises an elastic element, the elastic element being arranged in the second chamber and connected with the valve body and the movable element, the elastic element being arranged between the movable element and the valve body along the first direction, the elastic element being pressed by the movable element.

3. The fluid anti-suckback valve of claim 2, wherein, A side of the movable element facing the elastic element is recessed to form a groove structure along the second direction, part of the elastic element is arranged in the groove structure and abuts against an inner wall of the groove structure.

4. The fluid anti-suckback valve of claim 1 wherein, The sealing part comprises a sealing end, the sealing end being movable relative to the valve body to open or close the glue outlet, the sealing end being arranged outside the glue injection cavity.

5. The fluid anti-suckback valve of claim 1 wherein, The movable element comprises a first sealing sheet and a second sealing sheet, the first sealing sheet being connected to a side of the movable element facing the first chamber, the first sealing sheet being bent along the second direction and abutting against an inner wall of the valve body, the second sealing sheet being connected to a side of the movable element facing the second chamber, the second sealing sheet being bent along the first direction and abutting against an inner wall of the valve body.

6. The fluid anti-suckback valve of claim 1 wherein, The valve body comprises an upper cover, a connecting element and a support connected with each other, the connecting element being arranged between the upper cover and the support along the first direction, the upper cover and the connecting element defining the accommodating cavity together, the support and the connecting element defining the glue injection cavity together.

7. The fluid anti-suckback valve of claim 6 wherein, An inner part of the connecting element defines a sealing channel, the sealing channel being communicated with two ends of the connecting element along the first direction and the second direction respectively, the sealing channel being communicated with the second chamber and the glue injection cavity, the sealing part being arranged in the sealing channel and abutting against an inner wall of the sealing channel.

8. The fluid anti-suckback valve of claim 7 wherein, A side of the connecting element facing the upper cover is recessed to form a first sunken groove along the first direction, the first sunken groove being arranged around the sealing channel, the fluid backflow valve further comprises a first sealing element, the first sealing element being arranged in the first sunken groove and abutting against an outer wall of the sealing part.

9. The fluid anti-suckback valve of claim 7 wherein, The connecting piece is recessed in a second direction to form a second recess on a side facing the support, the second recess is arranged around the sealing channel, and the fluid backflow valve further comprises a second sealing piece arranged in the second recess and abutting against the outer wall of the sealing part.

10. Hot melt glue gun, characterized in that Comprise: A gluing assembly defining a glue inlet channel and a glue applying channel in communication; The fluid backflow valve according to any one of claims 1 to 9 is connected to the gluing assembly, the glue inlet is in communication with the glue inlet channel, and the sealing part is movable relative to the valve body to communicate or separate the glue outlet and the glue applying channel.

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