Valve assembly having overpressure protection function and aerosol having the same

Abstract

According to the present invention, disclosed is a valve assembly capable of relieving an overpressure state. The valve assembly comprises: a mounting portion having a hollow portion inside and mounted on a mount cup; a stem housing having a communication flow path enabling communication of the hollow portion and a receiving space and having an extension pipe extending from the mounting portion; a valve stem having one side passing through a through-hole formed in a central portion of the mount cup and the other side slidably disposed in the hollow portion, and having an orifice selectively communicating with the hollow portion by means of sliding; and a flow path blocking valve portion configured to block an inlet of the communication flow path when overpressure occurs. The flow path blocking valve portion comprises: a closing member formed of a ball-shaped steel material; a melting insert accommodated in the extension pipe so that one side thereof faces the inlet while completely accommodating and holding the closing member therein, and configured to block a gap between the inlet and the closing member disposed to cover the inlet after being melted at a preset temperature or higher to release the holding of the closing member; and a cover member mounted on the extension pipe so as to cover the other side of the melting insert, and configured to prevent the molten insert from being displaced within the extension pipe.

Description

Valve assembly having an overpressure relief function and an injector having the same

[0001] The present invention relates to a valve assembly capable of relieving an overpressure state and an injector having the same.

[0002] In general, a spray gun is a container that seals the contents (fluid or gas) to be sprayed inside a housing and uses internal pressure to spray the contents outward. Representative examples of such spray guns include portable gas containers, spray mosquito repellent, hair spray, portable aerosol fire extinguishers, and gas lighter containers.

[0003] Typically, a spray gun comprises a housing (can) for containing the contents, a mount cup secured to the top of the housing, and a valve assembly secured to the central protrusion of the mount cup. The valve assembly is configured to keep the spray gun sealed when not in use and to allow the contents to flow out only when in use.

[0004] However, the injector may reach an overpressure state due to thermal, mechanical or chemical reasons during use or storage, and since the valve assembly discharges a certain amount of contents or is in a sealed state, malfunction of the injector (expansion or deformation, etc.) may occur when the injector reaches an overpressure state.

[0005] Malfunctions of these injectors can lead to dangerous situations, such as explosions. To address this, conventional methods have included adding various structures to release overpressure gas to the outside. However, these structures pose a risk of other types of safety hazards due to the sudden release of large quantities of overpressure gas.

[0006] One object of the present invention is to provide a valve assembly having an overpressure relief function capable of relieving overpressure when an overpressure state is reached and having a more robust structure, and an injector having the same.

[0007] Another object of the present invention is to provide a valve assembly having an overpressure relief function that can stably perform the function of relieving overpressure when an overpressure state is reached, and an injector having the same.

[0008] In order to achieve the object of the present invention, a valve assembly according to one embodiment of the present invention is a valve assembly mounted on a mount cup fixed to the upper end of a housing having an accommodation space, the valve assembly comprising: a stem housing having a mounting portion mounted on the mount cup and having a hollow portion therein; a communication passage connecting the hollow portion and the accommodation space and an extension pipe extending from the mounting portion; a valve stem having an orifice that passes through a through hole formed in the center of the mount cup on one side and is slidably disposed on the hollow portion on the other side, and selectively communicates with the hollow portion by the sliding; and a flow passage shut-off valve portion configured to block an inlet of the communication passage when overpressure occurs, the flow passage shut-off valve portion comprising: a closing member formed of a ball-shaped steel material; A molten insert is accommodated inside the extension pipe so that one side faces the inlet while completely accommodating and holding the closure member inside, and is arranged to close the gap between the closure member and the inlet after melting at a preset temperature or higher and releasing the holding of the closure member; and a cover member is provided that is mounted on the extension pipe so as to cover the other side of the molten insert and prevents the molten insert from coming off within the extension pipe.

[0009] According to an example related to the present invention, the cover member has a ventilation hole that communicates between the inlet and the receiving space, and a portion where the ventilation hole is not formed can be formed to overlap a portion of the closing member so as to prevent the closing member from being separated from the molten insert and flowing into the receiving space through the ventilation hole.

[0010] According to an example related to the present invention, the central axis of the ventilation hole may be formed to correspond to the central axis of the extension pipe.

[0011] According to an example related to the present invention, the cover member may include a first portion having an outer diameter larger than the inner surface of the extension pipe; and a second portion formed at both ends of the first portion and having an outer diameter smaller than the inner surface of the extension pipe.

[0012] According to an example related to the present invention, the extension tube may be formed of the same material as the cover member.

[0013] According to an example related to the present invention, the molten insert may include a body portion formed in a hollow shape to accommodate the closing member therein; a first engaging portion protruding at a predetermined interval along the inner circumference of one side of the body portion; and a second engaging portion protruding at a predetermined interval along the inner circumference of the other side of the body portion to prevent the closing member from being detached together with the first engaging portion.

[0014] According to an example related to the present invention, the first and second catches may be arranged to be staggered along the axial direction of the body portion.

[0015] According to an example related to the present invention, each of the first and second catch portions may have a first inclined portion that protrudes obliquely from the outside toward the inside where the closing member is accommodated; and a second inclined portion that protrudes obliquely from the inside where the closing member is accommodated toward the outside at a greater oblique angle than the first inclined portion.

[0016] According to an example related to the present invention, the closing member may be received and caught in the inlet when the molten insert is melted, and the molten insert may be fused to the closing member caught in the inlet and the inlet.

[0017] According to an example related to the present invention, the tip of the inlet may be provided with a stepped portion protruding inward so that the closing member is caught.

[0018] According to an example related to the present invention, the extension pipe may have a receiving groove formed on the peripheral portion of the inlet to receive a portion of the molten insert when the molten insert is melted.

[0019] According to another embodiment of the present invention, an injector comprises the valve assembly.

[0020] The effects of the present invention obtained through the above-described solution are as follows.

[0021] The valve assembly of the present invention includes a flow shut-off valve portion that blocks the inlet of a communication channel when overpressure occurs. The flow shut-off valve portion includes a closing member formed of a ball-shaped steel material. In addition, the molten insert melts when the injector reaches an overpressure state, releases the holding of the closing member that is restricted from leaving while being completely contained, and at this time, falls to close the gap between the closing member, which is arranged to cover the inlet of the communication channel, and the inlet. Accordingly, the inlet of the communication channel is closed by the closing member and the molten insert that solidifies over time, thereby relieving the overpressure of the injector. In addition, the other side of the molten insert is supported by a cover member arranged facing the other side of the molten insert within the extension pipe, thereby preventing the molten insert from being detached due to the pressure during the filling of the injector. Accordingly, a valve assembly having a more robust structure while providing an overpressure relief function and an injector including the same can be provided.

[0022] In addition, the cover member provided in the valve assembly of the present invention has a ventilation hole that connects the inlet of the communication channel and the receiving space, and the central axis of the ventilation hole can be formed to correspond to the central axis of the extension pipe. According to the structure of the valve assembly as described above, the support structure for the inner circumference of the extension pipe is formed evenly, so that the inner circumference of the extension pipe can be more stably supported by the cover member. Accordingly, the deformation of the inlet of the extension pipe in an overpressure state of the injector can be minimized, and the flow path formed between the receiving space of the injector and the molten insert can be secured. As a result, the function of relieving the overpressure that occurs as the molten insert melts in an overpressure state can be performed more stably.

[0023] Fig. 1 is a cross-sectional view showing a valve assembly and an injector having the same according to one embodiment of the present invention.

[0024] Fig. 2 is a perspective view showing a valve assembly mounted on the mount cup illustrated in Fig. 1.

[0025] Figure 3 is an exploded perspective view of the valve assembly illustrated in Figure 2.

[0026] Figure 4 is a perspective view showing a cross-section of the valve assembly illustrated in Figure 2.

[0027] Figure 5 is a cross-sectional view of the valve assembly illustrated in Figure 4.

[0028] Figure 6 is an enlarged view of part A shown in Figure 5.

[0029] Fig. 7 is a cross-sectional view showing a portion of an injector having the valve assembly illustrated in Fig. 1 mounted in an injector receiving portion.

[0030] Figures 8 and 9 are enlarged views of part B shown in Figure 7, and are conceptual diagrams showing the appearance of the injector before and after it reaches an overpressure state, respectively.

[0031] Figure 10 is a perspective view, a plan view, and a cross-sectional view of the molten insert illustrated in Figure 5.

[0032] Fig. 11 is a perspective view, a plan view, and a cross-sectional view of the cover member illustrated in Fig. 5.

[0033] Figure 12 is a drawing showing a portion of the valve assembly illustrated in Figure 2 as viewed from the inlet side of the extension pipe.

[0034] Hereinafter, a valve assembly having an overpressure relief function related to the present invention and an injector having the same will be described in more detail with reference to the drawings.

[0035] In this specification, identical or similar reference numbers are assigned to identical or similar components even in different embodiments, and redundant descriptions thereof are omitted.

[0036] Singular expressions include plural expressions unless the context clearly indicates otherwise.

[0037] FIG. 1 is a cross-sectional view showing a valve assembly (100) and an injector (10) equipped therewith according to one embodiment of the present invention.

[0038] Referring to FIG. 1, the middle portion of the longitudinal direction of the injector (10) was judged to be unnecessary in explaining the present invention and was depicted as having been deleted by two cutting lines. However, only a portion of the side of the injector (10) between the two cutting lines was omitted, and in reality, each side of the injector (10) extends vertically and is connected to each other.

[0039] The housing (11) is cylindrical and has a receiving space (11a1) inside to receive contents such as fluid or gas and spray gas.

[0040] The housing (11) includes a body (11a) in which a receiving space (11a1) is formed, and a lower sealing cap (11b) and an upper sealing cap (11c) which seal both ends of the body (11a), respectively. The lower sealing cap (11b) may be formed in a curved shape toward the receiving space (11a1), and with this structure, when a certain level of overpressure is applied to the receiving space (11a1), it may be deformed to expand the volume of the receiving space (11a1).

[0041] The upper sealing cap (11c) can be coupled with the body (11a) to seal the upper portion of the body (11a). The upper sealing cap (11c) can form a seaming joint (11c1) so that it can be bent or rolled into contact with the mount cup (12). The seaming joint (11c1) is formed along the edge of the mount cup (12). The spray gun (10) can be coupled with the lower end of the upper sealing cap (11c) and the body (11a) in a neck-out type. However, the present invention is not necessarily limited thereto, and the body (11a) can be coupled to the lower end of the upper sealing cap (11c) in a neck-in type. In this case, the body (11a) can be formed to extend in a straight line in the longitudinal direction.

[0042] The housing (11) can contain high-pressure gaseous or liquid fuel and can be formed in the shape of a metal can capable of withstanding a certain internal pressure. However, the present invention is not necessarily limited thereto, and the housing (11) can contain pesticides, air fresheners, cosmetics, etc.

[0043] Additionally, a mount cup (12) for supporting the valve assembly (100) is coupled to the upper end of the upper sealing cap (11c).

[0044] The mount cup (12) includes a catch-shaped portion (12c) so that it can be mounted on a fuel-equipped appliance such as a gas range, and has a protruding portion (12b) provided in the center so that a valve assembly (100) can be fixed. However, the catch-shaped portion (12c) may not be present or may be formed in a different shape depending on the case. For example, in the case where a cosmetic or insecticide is contained in the housing (11) as another shape of the catch-shaped portion (12c), a cap having a push button for spraying may be mounted.

[0045] Fig. 2 is a perspective view showing a valve assembly (100) mounted on the mount cup (12) shown in Fig. 1. Fig. 3 is an exploded perspective view of the valve assembly (100) shown in Fig. 2. Fig. 4 is a perspective view showing a cross-section of the valve assembly (100) shown in Fig. 2. Fig. 5 is a cross-section view of the valve assembly (100) shown in Fig. 4.

[0046] Referring to FIGS. 2 to 5, the mount cup (12) has a notch groove (12d) formed on one side of the hook-shaped portion (12c) so that it can be mounted on an external device, such as a gas range or gas burner, to which the spray gun (10) can be mounted. When the spray gun (10) is mounted on the spray gun (10) receiving portion of the external device, the notch groove (12d) is positioned toward the upper side of the spray gun (10) receiving portion.

[0047] Meanwhile, the valve assembly (100) includes a valve stem (120) and a stem housing (110) for spraying contents filled in the receiving space (11a1) to the outside by pressing.

[0048] A through hole (12a) is formed in the upper central portion of the protruding portion (12b) of the mount cup (12).

[0049] A ring-shaped opening / closing member (123) is mounted on the upper inner surface of the protruding portion (12b) of the mount cup (12) so as to cover a portion of the through hole (12a).

[0050] The valve stem (120) is mounted so as to be able to slide up and down on the upper end of the protruding portion (12b) of the mount cup (12) by means of the opening and closing member (123). The upper part of the valve stem (120) is exposed to the outside of the housing (11) by passing through the central hole and the through hole (12a) of the opening and closing member (123). The lower part of the valve stem (120) is arranged so as to be received inside the upper end of the protruding portion (12b) of the mount cup (12). In addition, a joining groove (124) is formed along the circumferential direction on the side surface of the valve stem (120), and the inner portion of the opening and closing member (123) is inserted into and joined to the joining groove (124), and the valve stem (120) can be supported so as to be able to slide up and down by the opening and closing member (123).

[0051] An exhaust hole (121) is formed penetrating downward from the top of the valve stem (120), and an orifice (122) is formed between the lower end of the exhaust hole (121) and the joining groove (124), and the exhaust hole (121) can be communicated with the receiving space (11a1) of the housing (11) through the orifice (122). At this time, the opening / closing member (123) surrounds the joining groove (124) of the valve stem (120), and the orifice (122) can be selectively opened / closed by sliding the valve stem (120).

[0052] The stem housing (110) may be equipped with a mounting portion (111) and an extension pipe (112).

[0053] The mounting portion (111) has a hollow portion (111a) therein, and the extension pipe (112) has a communication passage for connecting the hollow portion (111a) and the receiving space (11a1) of the housing (11). The hollow portion (111a) can be selectively connected to the exhaust hole (121) through an orifice (122).

[0054] A part of the mounting portion (111) is accommodated inside the protruding portion (12b) of the mount cup (12) and has a hollow portion (111a), so that the lower part of the valve stem (120) is arranged to be able to slide in the hollow portion (111a). At this time, the upper part of the mounting portion (111) is configured to support the outer periphery of the opening / closing member (123).

[0055] A valve spring (113) is provided inside the mounting portion (111), and the valve spring (113) is configured to elastically support the lower portion of the valve stem (120).

[0056] A communication passage is provided inside the extension pipe (112), and the hollow portion (111a) and the receiving space (11a1) of the housing (11) are connected to each other through the communication passage.

[0057] The extension pipe (112) extends from the mounting portion (111) and may be formed in an approximately L shape. More specifically, the extension pipe (112) may be formed of a first extension portion (112a) extending from the mounting portion (111) toward the lower sealing cap (11b) and a first extension portion (112b) bent from the first extension portion (112a). Here, the first extension portion (112b) may be formed in a direction perpendicular to the first extension portion (112a).

[0058] According to the structure of the extension pipe (112) as described above, the communication passages (112a1, 112b1) may be composed of a first communication passage part (112a1) extending in the same or similar direction as the longitudinal direction of the housing (11) or the sliding direction of the valve stem (120), and a second communication passage part (112b1) extending from the first communication passage part (112a1) in the lateral direction of the housing (11). The second communication passage part (112b1) may extend in a direction intersecting the side surface of the housing (11). The upper end of the first communication passage part (112a1) may be communicated with the hollow portion (111a), and the end of the second communication passage part (112b1) may be arranged to be spaced apart from the upper sealing cap (11c) so as to be communicated with the receiving space (11a1).

[0059] Hereinafter, the gas discharge mechanism of the valve assembly (100) will be described with reference to FIG. 6.

[0060] Figure 6 is an enlarged view of part A shown in Figure 5.

[0061] When the injector (10) is installed so as to lie horizontally in the injector (10) receiving portion of an external device (such as a gas range or gas burner), the notch groove (12d) of the mount cup (12) is positioned so as to face upwards of the injector (10) receiving portion, and the second communication path (112b1) of the stem housing (110) is also positioned so as to face upwards.

[0062] In the case of an injector (10) using liquid fuel, the liquid fuel may sink in the direction of gravity during use, and the gaseous fuel evaporated into the upper space of the receiving space (11a1) based on the imaginary longitudinal center line of the housing (11) may flow into the hollow portion (111a) through the second communication passage portion (112b1) and the first communication passage portion (112a1).

[0063] The valve stem (120) can be pressed in the longitudinal direction of the housing (11), and the valve spring (113) is compressed by the pressing, and the valve stem (120) slides toward the receiving space (11a1). By the sliding of the valve stem (120), the inner circumference of the opening / closing member (123) is pushed toward the receiving space (11a1), and thereby the orifice (122) is opened, so that the gaseous fuel in the receiving space (11a1) can be sprayed to the outside through the valve stem (120) from the hollow portion (111a) of the stem housing (110). When the pressing of the valve stem (120) is released, the valve stem (120) can slide toward the opposite side of the receiving space (11a1) by the restoring force of the compressed valve spring (113), and the spraying of the contents can be stopped.

[0064] Hereinafter, the operating mechanism of the euro blocking valve part (130) will be described in more detail with reference to FIGS. 1 to 6 and FIGS. 7 to 9.

[0065] Fig. 7 is a cross-sectional view showing a portion of an injector (10) equipped with a valve assembly (100) illustrated in Fig. 1, mounted in a receiving portion of the injector (10). Figs. 8 and 9 are enlarged views of portion B illustrated in Fig. 7, and are conceptual diagrams showing the injector (10) before and after it reaches an overpressure state, respectively.

[0066] The spray gun (10) according to the present invention may reach an overpressure state due to thermal, mechanical or chemical reasons during use or storage, and in this case, the flow-blocking valve part (130) may be configured to close the stem housing (110) so that the contents within the receiving space (11a1) of the housing (11) do not leak out to the outside.

[0067] Referring to FIGS. 7 to 9, the euro shut-off valve part (130) has a closing member (131), a melt insert (132), and a cover member (133).

[0068] The closing member (131) is formed of a ball-shaped steel material. That is, the closing member (131) may have a spherical shape. In addition, for example, the diameter of the closing member (131) may be formed to be 2.5 mm.

[0069] The molten insert (132) is accommodated inside the extension pipe (112) so that one side faces the inlet (112b1a) while completely accommodating and holding the closing member (131) inside. The molten insert (132) is arranged to cover the inlet (112b1a) after melting at a preset temperature or higher and releasing the holding of the closing member (131), and close the gap between the closing member (131) and the inlet (112b1a).

[0070] That is, when the injector (10) reaches an overpressure state for some reason, the temperature rise occurring inside the injector (10) causes the molten insert (132) to melt, thereby blocking the inlet (112b1a) of the communication path.

[0071] More specifically, as illustrated in FIG. 8, in a normal state, the molten insert (132) is in a solid state and is formed to maintain a structure that accommodates and holds a closing member (131) therein. At this time, the closing member (131) is positioned so as to be completely accommodated within the molten insert (132) so as to not fall downward and to maintain a held state.

[0072] And when overpressure occurs in the injector (10), as shown in FIG. 9, when the molten insert (132) is melted, the structure holding the closing member (131) is liquefied, causing the closing member (131) to fall before the molten insert (132) melted by gravity. At this time, the closing member (131) is placed to fall into the inlet (112b1a) of the communication channel (112a1, 112b1) and cover the inlet (112b1a). Thereafter, the molten insert (132) that is melted flows downward relatively later than the closing member (131), and is configured to block the gap between the closing member (131) covering the inlet (112b1a) and the inlet (112b1a) of the communication channel. That is, the inlet (112b1a) of the communication channel (112a1, 112b1) is completely blocked by the closing member (131) and the molten insert (132).

[0073] At this time, the closing member (131) may be received and caught in the inlet (112b1a) of the communication channel (112a1, 112b1) when the molten insert (132) is melted. For example, the depth of the inlet (112b1a) of the communication channel may be formed to be larger than the size of the closing member (131), so that the closing member may be completely received in the inlet (112b1a) of the communication channel. Alternatively, the depth of the inlet (112b1a) of the communication channel may be formed to be larger than the size of the closing member (131). In this case, the closing member (131) may have a portion that is partially out of the inlet (112b1a) of the communication channel while being received in the inlet (112b1a) of the communication channel.

[0074] In addition, the tip of the inlet (112b1a) of the communication channel (112a1, 112b1) may be provided with a stepped portion (112b1b) protruding inwardly so that the closing member (131) is caught. In addition, the molten insert (132) may be formed so that the closing member (131) caught on the inlet (112b1a) and the inlet (112b1a) are fused together. For example, when overpressure occurs, the molten insert (132) may be formed so as to completely cover the inlet (112b1a) while the closing member (131) is completely accommodated in the inlet (112b1a).

[0075] Additionally, the extension tube (112) may be provided with a receiving groove (112d).

[0076] The receiving groove (112d) may be formed around the inlet (112b1a) of the communication channel (112a1, 112b1). The receiving groove (112d) may be formed to have a predetermined depth and may be formed to surround the outside of the inlet (112b1a). The receiving groove (112d) is configured to receive a portion of the molten insert (132) when overpressure occurs and the molten insert (132) is melted. Accordingly, the molten insert (132) fused to the inlet (112b1a) of the communication channel (112a1, 112b1) and the molten insert (132) received in the receiving groove (112d) may be integrally connected to form a single body. According to this structure, the fixed state of the closing member (131) arranged to close the inlet (112b1a) can be maintained more stably, thereby more stably preventing the phenomenon of the communication path (112a1, 112b1) being opened again and the overpressure gas leaking out of the injector (10).

[0077] Meanwhile, when the overpressure in the injector (10) is generated and the molten insert (132) is melted, the gap between the closing member (131) covering the inlet (112b1a) and the inlet (112b1a) of the communication channel is blocked, and as time passes and the overpressure in the injector (10) is relieved and the temperature drops, the molten molten insert (132) solidifies again. At this time, the molten insert (132) that has solidified and converted to a solid state again can be made to firmly maintain the structure formed to completely block the closing member (131) and the gap around it. Accordingly, even when pressure is continuously applied due to gas pressure after the inlet (112b1a) of the communication channel is blocked by the flow path shut-off valve unit (130), the communication channels (112a1, 112b1) are prevented from being opened again.

[0078] The cover member (133) is mounted on the extension pipe (112) to cover the other side of the molten insert (132), and is configured to prevent the molten insert (132) from coming off within the extension pipe (112). More specifically, when the contents and injection gas are filled into the injector (10), the gas pressure is formed in the opposite direction to the direction in which the molten insert (132) is inserted into the extension pipe (112). The valve assembly (100) is provided with the cover member (133), and can effectively prevent the molten insert (132) from coming off within the extension pipe (112) when the contents and injection gas are filled.

[0079] In addition, the cover member (133) may be formed so that at least a portion of the outer surface is in contact with the inner surface of the extension pipe (112) to support the extension pipe (112). Accordingly, the extension pipe (112) is structurally supported by the cover member (133), thereby preventing the extension pipe (112) from being deformed due to the rising temperature when overpressure occurs. On the other hand, if the cover member (133) is not present, the extension pipe (112) may contract due to heat when overpressure occurs, resulting in deformation.

[0080] In addition, although not shown in the drawings of the present invention, the cover member (133) may be formed to have a C-shaped cross-section rather than a ring-shaped cross-section. Accordingly, the cover member (133) is formed to have elasticity, so that the function of the cover member (133) described above can be performed in the same or similar manner, while improving workability in the process of assembling the cover member (133) into the extension pipe (112).

[0081] In this way, the cover member (133) can perform the function of preventing the detachment of the molten insert (132) that completely accommodates the closing member (131) when the contents are filled, and the function of supporting the inner surface of the extension pipe (112) when overpressure occurs to prevent deformation of the extension pipe (112).

[0082] Meanwhile, the end portions of the cover member (133) and the extension pipe (112) on the receiving space (11a1) side can be formed to coincide with each other. Accordingly, the cover member (133) is formed to support the entire longitudinal portion of the extension pipe (112), thereby more stably preventing deformation of the extension pipe (112).

[0083] The cover member (133) may be provided with a ventilation hole (133a) that provides communication between the inlet (112b1a) of the communication channel and the receiving space (11a1). Here, the central axis (133a1) of the ventilation hole (133a) may be formed to correspond to the central axis (112c) of the extension pipe (112). For example, the central axis (133a1) of the ventilation hole (133a) may be formed to coincide with the central axis (112c) of the extension pipe (112).

[0084] According to the structure of the valve assembly (100) as described above, the support structure for the inner surface of the extension pipe (112) is evenly formed, so that the inner surface of the extension pipe (112) can be more stably supported by the cover member (133). Accordingly, deformation of the inlet (112b1a) of the extension pipe (112) in an overpressure state of the injector (10) is minimized, and a flow path formed between the receiving space (11a1) of the injector (10) and the molten insert (132) can be secured. As a result, the overpressure relief function by the flow path blocking valve part (130), which is performed when the injector (10) reaches an overpressure state and the molten insert (132) is melted, can be performed more stably.

[0085] As described above, the valve assembly (100) includes a flow path shut-off valve part (130) that blocks the inlet (112b1a) of the communication path (112a1, 112b1) when overpressure occurs. In addition, the flow path shut-off valve part (130) is provided with a closing member (131) formed of a ball-shaped steel material. At this time, the molten insert (132) is melted when the injector (10) reaches an overpressure state, releases the holding of the closing member (131) that is restricted from leaving in a completely contained state, and falls to cover the inlet (112b1a) of the communication path (112a1, 112b1) and closes the gap between the closing member (131) and the inlet (112b1a).

[0086] Accordingly, the inlet (112b1a) of the communication passage (112a1, 112b1) is closed by the closing member (131) and the molten insert (132) that solidifies over time, thereby relieving the overpressure of the spray gun (10). In addition, the other side of the molten insert (132) is supported by the cover member (133) that is arranged to face the other side of the molten insert (132) within the extension pipe (112), thereby preventing the molten insert (132) from being detached due to the pressure when filling the contents into the spray gun (10). Accordingly, it is possible to provide a valve assembly (100) having a more robust structure while providing an overpressure relief function, and a spray gun (10) having the same.

[0087] Meanwhile, the molten insert (132) is formed to melt at a temperature of 100 degrees Celsius or higher and 130 degrees Celsius or lower, and the cover member (133) may be formed to have a melting point that is 30 degrees Celsius or higher than that of the molten insert (132). The cover member (133) may be formed to have a melting point of, for example, 165 degrees Celsius.

[0088] Additionally, the cover member (133) may be formed of acetal polyoxymethylene.

[0089] In addition, the extension pipe (112) may be formed of the same material as the cover member (133). That is, the extension pipe (112) may be formed of acetal polyoxymethylene. In addition, the extension pipe (112) may be formed to have a melting point of 165 degrees Celsius, similar to the cover member (133).

[0090] Meanwhile, the cover member (133) may be formed of a material having a higher melting point than the extension pipe (112). Accordingly, since the cover member (133) is formed of a material that is more heat-resistant than the extension pipe (112), even if the extension pipe (112) melts first when overpressure occurs, the cover member (133) can stably support the extension pipe (112). Consequently, deformation of the extension pipe (112) can be more effectively prevented.

[0091] Hereinafter, the structure of the molten insert (132) and the cover member (133) will be described in more detail with reference to FIGS. 10 and 11.

[0092] Fig. 10 is a perspective view, a plan view, and a cross-sectional view of the molten insert (132) illustrated in Fig. 5. Fig. 11 is a perspective view, a plan view, and a cross-sectional view of the cover member (133) illustrated in Fig. 5.

[0093] First, referring to FIG. 10, the molten insert (132) may include a body portion (132a), a first catch portion (132b), and a second catch portion (132c).

[0094] The body portion (132a) can be formed in a hollow shape to accommodate a closing member (131) therein.

[0095] The first catch (132b) can protrude at a certain interval along the inner circumference of one side of the body (132a).

[0096] The second catch (132c) may be formed to protrude at a certain interval along the inner circumference of the other side of the body (132a) to prevent the closing member (131) from coming off together with the first catch (132b).

[0097] Here, the first and second catches (132b, 132c) may each be provided in multiple numbers.

[0098] In addition, the first catch (132b) and the second catch (132c) may be arranged to be staggered along the axis (132a1) direction of the body (132a). That is, the first and second catch (132b, 132c) may be arranged so as not to overlap each other when viewed from one side of the body (132a). According to the structure of the first and second catch (132b, 132c) as described above, even when the number of the first and second catch (132b, 132c) is relatively small, the first and second catch (132b, 132c) forming the holding structure of the closing member (131) can be arranged more densely, thereby more effectively preventing the closing member (131) from coming off.

[0099] In addition, the first and second catches (132b, 132c) can be formed symmetrically at both ends of the body (132a). Accordingly, since there is no need to distinguish the direction during the process of assembling the molten insert (132) into the extension tube (112), the assembly work of the molten insert (132) can be performed more easily.

[0100] Meanwhile, each of the first and second catches (132b, 132c) may have a first slope (132b1, 132c1) and a second slope (132b2, 132c2).

[0101] The first inclined portion (132b1, 132c1) may protrude from the outside in an inclined manner toward the inside where the closing member (131) is accommodated. For example, the first inclined portion (132b1, 132c1) may be formed to have a first inclined angle (132b1a, 132c1a).

[0102] The second inclined portion (132b2, 132c2) may protrude from the inside where the closing member (131) is accommodated toward the outside at a greater angle of inclination than the first inclined portion (132b1, 132c1). For example, the second inclined portion (132b2, 132c2) may be formed to have a second angle of inclination (132b2a, 132c2a) that is greater than the first angle of inclination (132b1a, 132c1a).

[0103] According to the structure of the first and second catch portions (132b, 132c) as described above, in the process of inserting the closing member (131) into the molten insert (132), the closing member (131) is guided by the first inclined portion (132b1, 132c1) which is relatively gently inclined, so that it can be easily inserted into the molten insert (132). That is, the force required to insert the closing member (131) into the molten insert (132) can be reduced, thereby improving the convenience of assembling the closing member (131).

[0104] Conversely, the closing member (131) inserted into the molten insert (132) can be stably prevented from being separated from the molten insert (132) by the relatively steeply inclined second slope (132b2, 132c2).

[0105] Next, referring to FIG. 11, the cover member (133) may have a first part (133b) and a second part.

[0106] The first part (133b) may have an outer diameter larger than the inner circumference of the extension pipe (112). The first part (133b) is formed to support the inner circumference of the extension pipe (112).

[0107] The second part (133c) is formed at both ends of the first part (133b) and may have an outer diameter smaller than the inner surface of the extension pipe (112). In addition, the first parts (133b) at both ends of the cover member (133) may be formed symmetrically with respect to the first part (133b).

[0108] According to the structure of the cover member (133) as described above, there is no need to distinguish the direction when assembling the cover member (133) into the extension pipe (112), thereby making the assembly work of the cover member (133) easier, thereby improving the convenience of the user.

[0109] Hereinafter, a structure for preventing the detachment of the closing member (131) accommodated in the molten insert (132) will be described with reference to FIG. 12.

[0110] Fig. 12 is a drawing showing a part of the valve assembly (100) illustrated in Fig. 2 as viewed from the inlet (112b1a) side of the extension pipe (112).

[0111] Referring to FIG. 12, in order to prevent the closing member (131) from being separated from the molten insert (132) and flowing into the receiving space (11a1) through the ventilation hole (133a) of the cover member (133), a portion where the ventilation hole (133a) is not formed may be formed to overlap a portion of the closing member (131).

[0112] More specifically, when the contents and injection gas are filled into the injector (10), the gas pressure is formed in the opposite direction to the direction in which the molten insert (132) is inserted into the extension tube (112). At this time, the gas pressure acts not only on the molten insert (132) but also on the closing member (131) accommodated in the molten insert (132).

[0113] Accordingly, even if the structure of the molten insert (132) that holds the closing member (131) is damaged by the gas pressure and the closing member (131) is separated from the molten insert (132), the portion of the cover member (133) where the ventilation hole (133a) is not formed can be formed to overlap a portion of the closing member (131), thereby preventing the closing member (131) from being separated from the extension pipe (112). In addition, even in this case, the closing member (131) can still perform its function of blocking the inlet (112b1a) of the communication path when overpressure occurs together with the molten insert (132).

[0114] The foregoing description is merely exemplary, and various modifications may be made by those skilled in the art to which the present invention pertains without departing from the scope and technical spirit of the described embodiments. The above-described embodiments may be implemented individually or in any combination.

Claims

1. In a valve assembly mounted on a mount cup fixed to the top of a housing having a receiving space, A stem housing having a hollow portion inside and a mounting portion mounted on the mount cup, a communication passage connecting the hollow portion and the receiving space, and an extension pipe extending from the mounting portion; A valve stem having an orifice that is slidably positioned in the hollow portion and selectively communicates with the hollow portion by sliding, with one side penetrating the through hole formed in the central portion of the mount cup; and In the event of overpressure, a flow path blocking valve section is included to block the inlet of the above-mentioned flow path. The above Euro shut-off valve part is, A closing member formed of a steel material in the shape of a ball; A molten insert which is accommodated inside the extension pipe so that one side faces the inlet while completely accommodating and holding the closure member inside, and is arranged to cover the inlet after melting at a preset temperature or higher and releasing the holding of the closure member, and blocks the gap between the closure member and the inlet; and A valve assembly characterized by having a cover member mounted on the extension pipe to cover the other side of the molten insert and prevent the molten insert from falling out within the extension pipe.

2. In paragraph 1, The above cover member has a ventilation hole that connects the inlet and the receiving space, A valve assembly characterized in that a portion of the ventilation hole is formed to overlap a portion of the closure member so as to prevent the closure member from being separated from the molten insert and flowing into the receiving space through the ventilation hole.

3. In paragraph 2, A valve assembly, characterized in that the central axis of the above vent corresponds to the central axis of the above extension pipe.

4. In paragraph 2, The above cover member, A first part having an outer diameter larger than the inner surface of the above extension tube; and A valve assembly characterized by having a second part formed at both ends of the first part and having an outer diameter smaller than the inner surface of the extension pipe.

5. In paragraph 1, A valve assembly characterized in that the above extension pipe is formed of the same material as the above cover member.

6. In paragraph 1, The above melting insert is, A body portion formed in a hollow shape to accommodate the closing member therein; A first catch portion protruding at a certain interval along the inner circumference of one side of the above body portion; and A valve assembly characterized by including a second engaging portion that protrudes along the inner circumference of the other side of the body portion at a predetermined interval and is formed together with the first engaging portion to prevent the closing member from being detached.

7. In paragraph 6, A valve assembly, characterized in that the first and second engaging parts are arranged in an alternating manner along the axial direction of the body part.

8. In paragraph 7, Each of the first and second catches above, A first inclined portion protruding from the outside toward the inside where the closing member is received; and A valve assembly characterized in that it has a second inclined portion that protrudes outwardly from the inside where the closing member is accommodated at a greater angle than the first inclined portion.

9. In paragraph 1, The above closing member is received and caught in the inlet when the above melting insert is melted, A valve assembly characterized in that the above molten insert is fused to the inlet and the closing member that is caught in the inlet.

10. In paragraph 9, A valve assembly characterized in that the tip of the inlet port is provided with a stepped portion protruding inwardly so that the closing member is caught.

11. In paragraph 9, The above extension pipe, A valve assembly characterized by having a receiving groove formed on the periphery of the inlet port to receive a portion of the molten insert when the molten insert is melted.

12. An injector characterized by including a valve assembly according to any one of claims 1 to 11.

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