A pressure relief structure and tool for use

Abstract

This utility model discloses a pressure relief structure for a tool and the tool itself. The pressure relief structure includes a piston (100) movable in the axial direction (L) of the tool within a tool cavity (11). The first end (101) of the piston in the axial direction forms a sealed gas chamber (12) within the tool cavity. Furthermore, the piston has a piston chamber (102) and a pressure relief channel (103) communicating with the piston chamber. The piston is provided with a pressure-bearing component (200) that can be switched to an open state. The pressure-bearing component is used to bear the gas pressure in the sealed gas chamber. When the gas pressure borne by the pressure-bearing component is greater than a preset threshold, the pressure-bearing component switches to an open state, so that the gas in the sealed gas chamber is discharged through the piston chamber and the pressure relief channel.

Description

Technical Field

[0001] This utility model relates to a pressure relief device, and more particularly to a pressure relief structure for tools. Background Technology

[0002] Tools containing high-pressure chambers (such as gas spring nail guns, high-pressure pneumatic wrenches, and gas-powered fastening tools) are widely used in fields such as construction and decoration, furniture manufacturing, and machining. These tools store high-pressure gas in their internal chambers and utilize the energy released by the expansion of the gas to perform their functions.

[0003] Some tools have chambers that can be pressurized up to 800 pounds per square inch (psi). Under such high pressure, the tools are at risk of rupture, which could compromise their safety. Therefore, to further ensure the safety of these tools, some are equipped with pressure relief devices.

[0004] However, current pressure relief devices are often external devices that are separate from the tools. Their complex structure and inconvenient carrying not only affect the efficiency of the pressure relief device, but also lack an automatic protection mechanism. When the gas pressure in the tool chamber exceeds the safety threshold, the external pressure relief device cannot be activated to automatically reduce the pressure, which can still easily lead to the tool breaking due to high pressure. Utility Model Content

[0005] One of the objectives of this invention is to provide a pressure relief structure for tools, which is integrated on the piston of the tool, thereby simplifying the structure while achieving automatic pressure relief, improving the convenience and safety of tool use.

[0006] To achieve the above objectives, this utility model proposes a pressure relief structure for a tool, comprising a piston capable of moving along the axial direction of the tool within the tool cavity, wherein a first end of the piston in the axial direction is used to form a sealed gas chamber within the tool cavity; wherein: The piston has a piston chamber and a pressure relief channel communicating with the piston chamber. The piston is provided with a pressure-bearing component that can be switched to an open state. The pressure-bearing component is used to bear the gas pressure in the sealed gas chamber. When the gas pressure borne by the pressure-bearing component is greater than a preset threshold, the pressure-bearing component switches to an open state so that the gas in the sealed gas chamber is discharged through the piston chamber and the pressure relief channel.

[0007] Furthermore, in the pressure relief structure described in this utility model, the pressure-bearing component includes: An air inlet is located on the axial end face of the piston chamber; A valve core is disposed within the piston chamber; An elastic element is disposed in the piston chamber and applies an elastic force to the valve core to resist gas pressure; When the gas pressure carried by the valve core is greater than a preset threshold, the valve core overcomes the elastic force of the elastic element and moves along the axial direction toward the side away from the axial end face of the piston chamber, so that the pressure-bearing component switches to the open state.

[0008] Furthermore, in the pressure relief structure described in this utility model, the pressure-bearing component also includes a sealing gasket, which is disposed between the valve core and the air inlet.

[0009] Furthermore, in the pressure relief structure described in this utility model, the first end of the valve core is provided with a groove, and the sealing gasket is disposed in the groove.

[0010] Furthermore, in the pressure relief structure described in this utility model, the pressure-bearing component further includes a guide bushing, which is fixedly disposed in the piston chamber, and the tail end of the valve core is correspondingly disposed in the guide bushing and is capable of moving in the axial direction relative to the guide bushing.

[0011] Furthermore, in the pressure relief structure described in this utility model, the elastic element includes a helical spring.

[0012] Furthermore, in the pressure relief structure described in this utility model, the axial end face of the piston chamber protrudes beyond the end face of the first end of the piston.

[0013] Furthermore, in the pressure relief structure described in this utility model, the pressure-bearing component includes a rupture disc covering the axial end face of the piston chamber. When the gas pressure carried by the rupture disc is greater than a preset threshold, the rupture port provided on the rupture disc opens, so that the pressure-bearing component switches to the open state.

[0014] Furthermore, in the pressure relief structure described in this utility model, the rupture disc has a protruding arched portion that protrudes toward the side facing the sealed gas chamber.

[0015] Furthermore, in the pressure relief structure described in this utility model, the pressure-bearing component also includes a sealing element, which is sealed between the rupture disc and the piston.

[0016] Furthermore, in the pressure relief structure described in this utility model, the pressure-bearing component also includes an upper cover with an axial through hole, which is pressed onto the rupture disc.

[0017] Furthermore, in the pressure relief structure described in this utility model, the upper cover is threadedly connected to the piston.

[0018] Another objective of this invention is to provide a tool that offers better ease of use and safety.

[0019] Based on the above-mentioned utility model objectives, this utility model also provides a tool that includes the pressure relief structure described above.

[0020] Furthermore, the tool described in this utility model includes a gas spring nail gun.

[0021] The pressure relief structure for tools described in this utility model is integrated onto the piston of the tool, thereby achieving automatic pressure relief with a simplified structure, improving the convenience and safety of tool use.

[0022] The pressure relief structure and tool described in this utility model also have the advantage of low cost. Attached Figure Description

[0023] Figure 1 A cross-sectional view of the tool described in this utility model is shown schematically in one embodiment.

[0024] Figure 2 A schematic cross-sectional view of the pressure relief structure described in this utility model is shown in one embodiment.

[0025] Figure 3 A cross-sectional view of the pressure relief structure described in this utility model is schematically shown in another embodiment.

[0026] Figure 4 The diagram schematically shows a top view of the rupture disc in another embodiment of the pressure relief structure described in this invention.

[0027] Figure 5 A cross-sectional view of the pressure relief structure described in this utility model is schematically shown in another embodiment. Detailed Implementation

[0028] The pressure relief structure and tool described in this utility model will be further explained and described below with reference to the accompanying drawings and specific embodiments. However, this explanation and description do not constitute an undue limitation on the technical solution of this utility model.

[0029] Tools containing high-pressure chambers, such as gas spring nail guns, high-pressure pneumatic wrenches, and gas-powered fastening tools, have a wide range of applications in fields such as construction and decoration, furniture manufacturing, and machining. These tools store high-pressure gas in their internal chambers and utilize the energy released by the expansion of the gas to perform their functions. Some of these tools can reach a maximum chamber pressure of 800 pounds per square inch (psi). Under such high pressure, the tools are at risk of rupture, which could compromise their safety.

[0030] Therefore, to further ensure the safety of tool use, some tools are equipped with pressure relief devices. However, current pressure relief devices are often external devices that are independent of the tool itself, with complex structures and inconvenient to carry. This affects the efficiency of the pressure relief device, and furthermore, these external pressure relief devices lack automatic protection mechanisms. When the gas pressure in the tool chamber exceeds the safety threshold, the external pressure relief device cannot automatically depressurize, requiring the operator to manually determine whether to connect the pressure relief device for depressurization. Therefore, such devices still cannot completely prevent accidents such as tool rupture or explosion due to high pressure.

[0031] To address the aforementioned problems, this invention provides a pressure relief structure for tools in one embodiment, which can achieve automatic pressure relief with a simplified structure.

[0032] Figure 1 A cross-sectional view of the tool described in this utility model is shown schematically in one embodiment.

[0033] like Figure 1 As shown, in some embodiments, the pressure relief structure for tool 1 includes a piston 100 movable within the tool cavity 11 along the axial direction L of the tool. A sealed gas chamber 12 within the tool cavity is formed between the first end 101 of the piston 100 in the axial direction and the inner wall of the tool housing. High-pressure gas is injected into the sealed gas chamber through an air inlet 13, thereby applying pressure to the piston 100, causing it to move axially away from the air inlet 13, and simultaneously moving the striker 14 connected to the piston, thereby realizing the operation of the tool.

[0034] In some more specific embodiments, the firing pin 14 can be fixedly connected to the piston via a threaded connection, thereby achieving synchronous action between the two.

[0035] Figure 2 A schematic cross-sectional view of the pressure relief structure described in this utility model is shown in one embodiment.

[0036] like Figure 2 As shown, in some embodiments, the piston 100 has a piston chamber 102 and a pressure relief passage 103 communicating with the piston chamber 102. In addition, the piston 100 is also provided with a pressure-bearing assembly 200 that can be switched to an open state.

[0037] When high-pressure gas is injected into the sealed gas chamber 12 through the air inlet 13, the pressure-bearing component 200 bears the gas pressure inside the sealed gas chamber 12. When the gas pressure borne by the pressure-bearing component 200 does not exceed a preset threshold, the pressure-bearing component 200 is in the closed state, and therefore the pressure relief function is not activated. At this time, under the action of the gas pressure inside the sealed gas chamber, the piston 100 and the firing pin 14 move axially away from the end of the air inlet 13, realizing the operation of the tool.

[0038] As the gas pressure inside the sealed chamber increases, when the gas pressure borne by the pressure-bearing component 200 exceeds a preset threshold, the pressure-bearing component 200 will switch to the open state to allow the gas inside the sealed chamber to, for example, […]. Figure 2 As indicated by the arrow, the pressure is discharged through the piston chamber 102 and the pressure relief passage 103, thereby achieving automatic pressure relief.

[0039] As can be seen, this utility model achieves automatic pressure relief under excessive pressure by integrating a pressure-bearing component 200 on the piston, a piston chamber 102, and a pressure relief channel 103 connected to the piston chamber 102, thereby effectively ensuring the safety of tool use. At the same time, since there is no need to carry an external pressure relief device, it also improves the ease of use of the tool and the pressure relief structure.

[0040] In some specific embodiments, a sealing ring 300 may be provided between the piston 100 and the inner wall of the tool housing, thereby achieving a better sealing effect of the sealing chamber 12.

[0041] In some more specific implementations, the sealing ring can be made of rubber.

[0042] In some more specific embodiments, the sealing ring 300 may be disposed in the sealing ring groove 104 on the outer circumferential wall of the piston.

[0043] In some specific embodiments, a guide ring 400 may be provided between the piston 100 and the inner wall of the tool housing. The outer periphery of the guide ring 400 may protrude slightly beyond the outer circumferential wall of the piston, so that when the piston moves relative to the tool in the axial direction, the guide ring contacts the inner wall of the tool housing, thereby preventing piston wear and further improving the service life of the piston.

[0044] In some more specific embodiments, multiple guide rings may be provided along the axial direction. For example... Figure 2 The two shown can also be set to one, three, four or other quantities.

[0045] In some more specific implementations, the guide ring can be made of wear-resistant plastic.

[0046] In some more specific implementations, such as Figure 2 As shown, the pressure-bearing assembly 200 may include: an air inlet 201 provided on the axial end face 105 of the piston chamber, a valve core 202 and an elastic element 203 provided in the piston chamber 102, wherein the elastic element 203 applies an elastic force to the valve core 202 to resist gas pressure.

[0047] With this configuration, when high-pressure gas is injected into the sealed chamber through the air inlet 13, and the gas pressure borne by the valve core 202 does not exceed the preset threshold, the pressure-bearing component is in the closed state, and therefore the pressure relief function is not activated. At this time, under the action of the gas pressure in the sealed chamber, the piston 100 and the striking pin 14 move along the axial direction L towards the end away from the air inlet 13, thereby realizing the operation of the tool.

[0048] As the gas pressure inside the sealed chamber increases, when the gas pressure borne by the valve core 202 exceeds a preset threshold (e.g., gas pressure exceeding 200 psi), the valve core 202 will overcome the elastic force of the elastic element 203 and move axially towards the side away from the axial end face of the piston chamber (i.e., towards...). Figure 2 (Move downwards in the middle), thereby causing the upper end face of the valve core 202 to move away from the air inlet 201, opening the air inlet 201, switching the pressure-bearing component to the open state, and sealing the gas in the air chamber, for example, Figure 2 As indicated by the arrow, the pressure is discharged through the piston chamber 102 and the pressure relief channel 103, thereby achieving automatic pressure relief and ensuring the safety of tool use.

[0049] In this embodiment, those skilled in the art can adjust the opening threshold of the pressure-bearing component by selecting and adjusting the elastic modulus of the elastic element.

[0050] In some more specific embodiments, the elastic element 203 may include a helical spring.

[0051] like Figure 2 As shown, in some specific embodiments, in order to further improve the sealing performance, the pressure-bearing assembly 200 may also include a sealing gasket 204 disposed between the valve core 202 and the air inlet 201.

[0052] like Figure 2 As shown, in some more specific embodiments, the valve core 202 may have a groove at its head end, and the sealing gasket 204 may be disposed in the groove, thereby further simplifying the structure of the pressure-bearing component and ensuring the stable placement of the sealing gasket.

[0053] In some more specific implementations, the gasket may be made of rubber.

[0054] like Figure 2As shown, in some more specific embodiments, the pressure-bearing assembly 200 may further include a guide bushing 205, which is fixedly disposed within the piston chamber 102. The tail end of the valve core 202 is correspondingly disposed within the guide bushing 205 and is movable relative to the guide bushing 205 in the axial direction L. The guide bushing further enhances the stability of the valve core's movement during opening and closing. When the guide bushing 205 is provided, the elastic element 203 can be abutted against between the valve core 202 and the guide bushing in the axial direction. The preload of the elastic element can be adjusted by adjusting the axial distance between the guide bushing and the valve core, thereby adjusting the valve core's opening threshold. It should be noted that the piston chamber 102 and the pressure relief channel 103 in this invention are necessarily interconnected, although from... Figure 2 See, guide bushing 205 appears to partially obstruct the pressure relief channel, but firstly... Figure 2 The illustration only shows the presence of a guide bushing in some embodiments, and the actual position of the guide bushing is not limited to this drawing. In addition, there is a gap between the guide bushing and the inner wall of the piston chamber, so the arrangement of the guide bushing will not affect the communication between the piston chamber 102 and the pressure relief channel 103.

[0055] Of course, in some alternative embodiments, the guide bushing may not be provided, in which case the elastic element is abutting between the valve core 202 and the striker 14 in the axial direction.

[0056] like Figure 2 As shown, in some specific embodiments, the axial end face 105 of the piston chamber protrudes beyond the end face of the first end 101 of the piston. This arrangement further increases the volume of the piston chamber 102, especially the axial extension dimension of the piston chamber 102, thereby enabling the piston chamber to accommodate a larger elastic element 203. The larger elastic element reduces the difficulty of adjusting the opening threshold of the pressure-bearing component, thus enabling it to achieve a wider range of opening thresholds.

[0057] In other specific embodiments, the pressure-bearing component in the pressure relief structure of this utility model may also adopt other structures.

[0058] Figure 3 A cross-sectional view of the pressure relief structure described in this utility model is schematically shown in another embodiment.

[0059] Figure 4 The diagram schematically shows a top view of the rupture disc in another embodiment of the pressure relief structure described in this invention.

[0060] like Figure 3 and Figure 4As shown, in some other embodiments, the pressure-bearing assembly 200 may include a rupture disc 206 covering the axial end face 105 of the piston chamber, the rupture disc having a rupture opening 2061.

[0061] With this configuration, when high-pressure gas is injected into the sealed chamber through the air inlet 13, and the gas pressure carried by the rupture disc 206 does not exceed the preset threshold, the pressure-bearing component is in the closed state, and therefore the pressure relief function is not activated. At this time, under the action of the gas pressure in the sealed chamber, the piston 100 and the firing pin 14 move along the axial direction L towards the end away from the air inlet, realizing the operation of the tool.

[0062] As the gas pressure in the sealed chamber increases, when the gas pressure carried by the rupture disc 206 exceeds a preset threshold (e.g., the gas pressure exceeds 200 psi), the rupture disc 206 breaks open at the rupture port 2061, the pressure-bearing component switches to the open state, and the gas in the sealed chamber enters the piston chamber 102 through the rupture port 2061 and is discharged from the pressure relief channel 103, thereby playing the role of automatic pressure relief.

[0063] In this embodiment, those skilled in the art can adjust the opening threshold of the pressure-bearing component by selecting and adjusting the rupture disc and its material, as well as the size of the rupture disc.

[0064] In some specific embodiments, in order to further ensure that the rupture disc 206 is stably disposed on the axial end face of the piston, the rupture disc 206 can be directly fixedly connected to the axial end face 105 of the piston.

[0065] In some more specific embodiments, the rupture disc 206 may be integrally formed with the axial end face of the piston.

[0066] In some more specific implementations, such as Figure 3 As shown, the rupture disc 206 has a protruding arched portion 2062 that protrudes towards the side of the sealed gas chamber. That is, the arched portion protrudes towards the pressure-bearing side. This arrangement allows for a smaller error in the burst pressure, thereby further precisely matching the safety pressure relief requirements of the sealed gas chamber and preventing premature or delayed rupture.

[0067] Of course, in some other alternative implementations, the rupture disc can also be configured as a planar rupture disc, i.e., without an arched portion.

[0068] Figure 5 A cross-sectional view of the pressure relief structure described in this utility model is schematically shown in another embodiment.

[0069] like Figure 5As shown, in some other embodiments, the pressure-bearing assembly may include a sealing element 207 in addition to the rupture disc described above, which is sealingly disposed between the rupture disc 206 and the piston. Furthermore, the pressure-bearing assembly also includes a top cover 208 having an axial through-hole 2081, which presses against the rupture disc, thereby stably positioning the rupture disc on the piston. That is, in this embodiment, the rupture disc is not directly fixed to the piston, but is disposed on the piston via the top cover; this arrangement makes it easier to replace the rupture disc once it ruptures.

[0070] In some more specific embodiments, the top cover 208 can be fixedly connected to the piston 100 by threads. Of course, in other more specific embodiments, the top cover can also be fixedly connected to the piston by pins, snaps, or other connection methods.

[0071] In one embodiment, this utility model also provides a tool having the pressure relief structure described above. It should be noted that since this utility model does not involve improvements to other components of the tool, their other components and operating process will not be described in detail here.

[0072] In some more specific embodiments, the tool may include a gas spring nail gun.

[0073] The tool described in this utility model has excellent ease of use and safety due to the use of this pressure relief structure.

[0074] For example, as shown in the figure, when high-pressure gas is injected into the sealed gas chamber 12 through the air inlet 13, the pressure-bearing component 200 will bear the gas pressure inside the sealed gas chamber 12. When the gas pressure borne by the pressure-bearing component 200 does not exceed a preset threshold, the pressure-bearing component 200 is in a closed state, and therefore the pressure relief function is not activated. At this time, under the action of the gas pressure inside the sealed gas chamber, the piston 100 and the firing pin 14 move axially away from the air inlet 13, realizing the operation of the tool, such as the nail-shooting action.

[0075] As the gas pressure in the sealed chamber increases, when the gas pressure borne by the pressure-bearing component 200 exceeds a preset threshold, the pressure-bearing component 200 will switch to the open state, so that the gas in the sealed chamber can be discharged through the piston chamber 102 and the pressure relief channel 103, thereby playing the role of automatic pressure relief.

[0076] Therefore, the tool described in this utility model is convenient and safe to operate. It does not require an additional pressure relief device. When the filling pressure exceeds the set threshold, it can automatically relieve pressure, thereby effectively ensuring user safety.

[0077] Furthermore, since the pressure relief structure is integrated into the piston (and therefore does not exceed the piston's dimensions), it does not occupy additional space, resulting in a more compact structure and higher energy efficiency. For example, placing the pressure relief structure on the gas-tight chamber of a tool would reduce the capacity of the gas-tight chamber to store gas; this invention effectively avoids this problem.

[0078] It should be noted that the prior art within the scope of protection of this utility model is not limited to the embodiments given in this utility model document. All prior art that does not contradict the solution of this utility model, including but not limited to prior patent documents, prior publications, prior public uses, etc., can be included in the scope of protection of this utility model.

[0079] Furthermore, the combination of the technical features in this case is not limited to the combination methods described in the claims of this case or the combination methods described in the specific embodiments. All technical features described in this case can be freely combined or combined in any way, unless they contradict each other.

[0080] It should also be noted that the embodiments listed above are merely specific embodiments of this utility model. Obviously, this utility model is not limited to the above embodiments, and any similar changes or modifications made thereto that can be directly derived or easily conceived by those skilled in the art from the content disclosed in this utility model should fall within the protection scope of this utility model.

Claims

1. A pressure relief structure for a tool, comprising a piston (100) movable within a tool cavity (11) along the axial direction (L) of the tool, the first end (101) of the piston in the axial direction being configured to form a sealed gas chamber (12) within the tool cavity; characterized in that: The piston has a piston chamber (102) and a pressure relief channel (103) communicating with the piston chamber. The piston is provided with a pressure-bearing component (200) that can be switched to an open state. The pressure-bearing component is used to bear the gas pressure in the sealed gas chamber. When the gas pressure borne by the pressure-bearing component is greater than a preset threshold, the pressure-bearing component switches to an open state so that the gas in the sealed gas chamber is discharged through the piston chamber and the pressure relief channel.

2. The pressure relief structure of claim 1, wherein, The pressure-bearing component includes: An air inlet (201) is provided on the axial end face (105) of the piston chamber; Valve core (202) is disposed in the piston chamber; An elastic element (203) is disposed in the piston chamber and applies an elastic force to the valve core to resist gas pressure; When the gas pressure carried by the valve core is greater than a preset threshold, the valve core overcomes the elastic force of the elastic element and moves along the axial direction toward the side away from the axial end face of the piston chamber, so that the pressure-bearing component switches to the open state.

3. The pressure relief structure of claim 2, wherein, The pressure-bearing component also includes a sealing gasket (204) disposed between the valve core and the air inlet.

4. The pressure relief structure of claim 3, wherein, The valve core has a groove at its first end, and the sealing gasket is disposed in the groove.

5. The pressure relief structure as described in claim 2, characterized in that, The pressure-bearing assembly also includes a guide bushing (205), which is fixedly disposed in the piston chamber, and the tail end of the valve core is correspondingly disposed in the guide bushing and is movable in the axial direction relative to the guide bushing.

6. The pressure relief structure as described in claim 2, characterized in that, The elastic element includes a helical spring.

7. The pressure relief structure as described in claim 1, characterized in that, The axial end face (105) of the piston chamber protrudes from the end face of the first end (101) of the piston.

8. The pressure relief structure as described in claim 1, characterized in that, The pressure-bearing component includes a rupture disc (206) covering the axial end face of the piston chamber. When the gas pressure carried by the rupture disc is greater than a preset threshold, the rupture port (2061) provided on the rupture disc opens, so that the pressure-bearing component switches to the open state.

9. The pressure relief structure as described in claim 8, characterized in that, The rupture disc has a protruding arched portion (2062) that protrudes toward the side facing the sealed gas chamber.

10. The pressure relief structure as described in claim 8, characterized in that, The pressure-bearing assembly also includes a sealing element (207) which is sealed between the rupture disc and the piston.

11. The pressure relief structure as described in claim 8, characterized in that, The pressure-bearing assembly also includes a top cover (208) with an axial through hole (2081) pressed onto the rupture disc.

12. The pressure relief structure as described in claim 11, characterized in that, The top cover is threadedly connected to the piston.

13. A tool, characterized in that, It includes the pressure relief structure as described in any one of claims 1-12.

14. The tool as claimed in claim 13, characterized in that, This includes gas spring nail guns.

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