Pressure relief pipe of safety valve group and safety valve group

Abstract

The pressure relief pipe comprises a first pressure relief pipe body and a second pressure relief pipe body, the end face of the outlet end of the first pressure relief pipe body is an inclined face, and the included angle between the end face of the outlet end of the first pressure relief pipe body and the axis of the first pressure relief pipe body is 45 degrees. The end face of the inlet end of the second pressure relief pipe is an inclined face, the included angle between the end face of the inlet end of the second pressure relief pipe and the axis of the second pressure relief pipe is 45 degrees, the outlet end of the first pressure relief pipe and the inlet end of the second pressure relief pipe are connected in a rotating fit mode, and a rotating positioning structure is arranged between the outlet end of the first pressure relief pipe and the inlet end of the second pressure relief pipe. The safety valve group comprises a ball valve, a check valve and a safety valve, a medium outlet of the ball valve is connected with a medium inlet of the check valve, one medium outlet of the check valve is connected with a medium inlet of the safety valve, and a pressure relief opening of the safety valve is connected with the pressure relief pipe. The pressure relief pipe can be converted between a straight pipe form and a 90-degree right-angle bent pipe form, and is suitable for installation and use of a safety valve group under the two conditions that an inlet of a water heater is horizontally and vertically downward.

Description

Technical Field

[0001] The invention relates to a pressure relief pipe of a safety valve group and a safety valve group using the pressure relief pipe, belonging to the technical field of valves. Background Art

[0002] The safety valve group of a water heater or heating system (usually arranged on the inlet side) is composed of a combination of multiple valves or has the functions of multiple valves. For example, the utility model patent with the publication number CN212251326U discloses a safety valve assembly for a water heater, including a valve body and a handle, the valve body including a transverse valve body and a vertical valve body, a water inlet and a water inlet channel are arranged in the transverse valve body cavity, a limit retaining ring is arranged in the transverse valve body, a check mechanism is installed in the transverse valve body, the check mechanism includes a rotary cap, a positioning plate, a check spring and a check valve core, the check valve core is provided with a spring core and a valve stem, the limit boss limits the spring core, an anti-blocking filter is arranged on one side of the rotary cap, a pressure relief channel and a pressure relief pipe are arranged in the vertical valve body, a pressure relief mechanism and an annular abutting convex portion are arranged in the pressure relief channel, the pressure relief mechanism includes a pressure relief valve core and a reset spring, a sealing gasket is pressed on the pressure relief valve core, and an annular concave portion abutting and sealing with the annular abutting convex portion is arranged on the sealing gasket. The safety valve assembly can prevent the elastic force of the check valve core from being damaged, the pressure value can be adjusted simply and conveniently, the anti-blocking filter can be quickly disassembled and cleaned, the abutment sealing is strong, and the sensitivity of pressure relief is guaranteed.

[0003] During the actual installation of the water heater, due to factors such as the outlet direction of the water heater and the installation of the pipe space, the inlet of the water heater may be horizontal or vertically downward. Since the outlet of the pressure relief tail pipe of the safety valve group must be installed vertically downward, two types of pressure relief tail pipes need to be prefabricated, one is a straight pipe and the other is a vertical elbow (90° elbow). On the one hand, it is easy to cause users to have difficulty in choosing or make purchase errors when purchasing before installing the water heater, and on the other hand, it also increases the manufacturer's production cost. Summary of the invention

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a pressure relief pipe of a safety valve group and a safety valve group, which can be suitable for use in two scenarios where the inlet of the water heater is horizontal and vertically downward.

[0005] The technical solution for achieving the above-mentioned purpose of the present invention is: the pressure relief pipe of the safety valve group includes a first pressure relief pipe and a second pressure relief pipe, the end face of the outlet end of the first pressure relief pipe is a slope and the angle between it and the axis of the first pressure relief pipe is 45°, the end face of the inlet end of the second pressure relief pipe is a slope and the angle between it and the axis of the second pressure relief pipe is 45°, the outlet end of the first pressure relief pipe and the inlet end of the second pressure relief pipe are rotationally connected and provided with a rotation positioning structure, and the pipe wall of the second pressure relief pipe is provided with an opening that penetrates inside and outside.

[0006] Preferably, there are a plurality of openings, and the plurality of openings are evenly distributed along the circumference of the second pressure relief pipe.

[0007] Furthermore, the number of the openings is two, and the two openings are symmetrically arranged along the circumferential direction on the second pressure relief pipe.

[0008] Preferably, the inlet end of the first pressure relief pipe is provided with a plug-in structure suitable for plugging with the pressure relief port of the safety valve group.

[0009] Preferably, the outlet end of the second pressure relief pipe is provided with an external thread suitable for connection with other pipelines or components.

[0010] Preferably, the outlet end of the first pressure relief pipe is provided with a first pressure relief pipe end plate, the angle between the plate surface of the first pressure relief pipe end plate and the axis of the first pressure relief pipe is 45°, the outlet of the first pressure relief pipe is arranged on the first pressure relief pipe end plate, the inlet end of the second pressure relief pipe is provided with a second pressure relief pipe end plate, the angle between the plate surface of the second pressure relief pipe end plate and the axis of the second pressure relief pipe is 45°, and the inlet of the second pressure relief pipe is arranged on the second pressure relief pipe end plate.

[0011] Preferably, a flow guide component is axially provided in the second pressure relief pipe.

[0012] Furthermore, the flow guide assembly includes a flow guide pipe and a flow guide member, the flow guide pipe is coaxially arranged in the second pressure relief pipe, its outer diameter is smaller than the inner diameter of the second pressure relief pipe, and its length is smaller than the length of the second pressure relief pipe, the inlet end of the flow guide pipe is fixedly connected to the end plate of the second pressure relief pipe and is connected to the inlet of the second pressure relief pipe, the flow guide member is conical, coaxially arranged in the flow guide pipe, and the conical end of the flow guide member is located outside the outlet end of the flow guide pipe.

[0013] Preferably, the guide member is composed of a plurality of guide plates, each of which is arranged along an axial section of the guide tube, the inner edges of each of the guide plates are connected together and located on the axis of the guide tube, the outer edges of each of the guide plates are fixedly connected to the inner wall of the guide tube, and the plurality of guide plates are evenly distributed along the circumference of the guide tube, the ends of the guide plates are located outside the outlet end of the guide tube, the outer edges of the end sides of the guide plates (the parts located outside the outlet end of the guide tube) are beveled edges inclined from outside to inside, and the ends of the beveled edges of each of the guide plates converge at one point and are located on the axis of the guide tube to form a tapered end.

[0014] Preferably, the outer edge of the head end side of the guide plate is connected to the mouth wall of the inlet of the second pressure relief pipe.

[0015] Preferably, an elastic clamp suitable for clamping with the outlet of the first pressure relief pipe is fixedly provided on the mouth wall of the inlet of the second pressure relief pipe, and the elastic clamp is annular and extends outward from the mouth wall of the inlet of the second pressure relief pipe, the axis of the elastic clamp is perpendicular to the plate surface of the second pressure relief pipe end plate, the outer diameter of the elastic clamp matches the caliber of the outlet of the first pressure relief pipe, and the elastic clamp and the mouth wall of the outlet of the first pressure relief pipe constitute a rotationally matched connection structure between the outlet end of the first pressure relief pipe and the inlet end of the second pressure relief pipe.

[0016] Furthermore, the elastic clamp is composed of a plurality of arc-shaped elastic teeth evenly distributed along the circumference of the inlet of the second pressure relief pipe, and a spacing is left between adjacent elastic teeth. The elastic teeth include an elastic plate and a hook arranged at the outer end of the elastic plate, and the hook portion of the hook extends radially outward. The outer diameter of the elastic plate matches the caliber of the outlet of the first pressure relief pipe, the height of the elastic plate matches the thickness of the end plate of the first pressure relief pipe, and the outer wall of the top end of the hook is a slope.

[0017] Preferably, the rotational positioning structure includes a positioning protrusion arranged on the side wall of the outlet of the first pressure relief pipe and a positioning groove arranged on the radial outer wall of the elastic clamp and matching with the positioning protrusion. The number of the positioning protrusion and the number of the positioning groove are both two, which are symmetrically distributed along the circumferential direction on their respective setting wall surfaces.

[0018] Preferably, two side walls of the positioning protrusion along the circumference of the outlet of the first pressure relief pipe and a side wall facing the outer side of the outlet of the first pressure relief pipe are inclined surfaces inclined from the outside to the inside.

[0019] Furthermore, the two positioning protrusions are arranged at positions on the side wall of the outlet of the first pressure relief pipe corresponding to the topmost and bottommost ends of the first pressure relief pipe end plate, that is, when the axis of the first pressure relief pipe is horizontal and the plate surface of the first pressure relief pipe end plate is at a 45° angle to the horizontal plane, the two positioning protrusions are respectively arranged at the topmost and bottommost ends of the side wall of the outlet of the first pressure relief pipe, and correspondingly, the two positioning grooves are arranged at positions on the radial outer wall of the elastic clamp corresponding to the topmost and bottommost ends of the second pressure relief pipe end plate, that is, when the axis of the second pressure relief pipe is horizontal and the plate surface of the second pressure relief pipe end plate is at a 45° angle to the horizontal plane, the two positioning grooves are respectively arranged at the topmost and bottommost ends of the radial outer wall of the elastic clamp.

[0020] Preferably, a plurality of blocking protrusions are provided on the side wall of the outlet of the first pressure relief pipe, and the height of the blocking protrusions protruding from the side wall of the outlet of the first pressure relief pipe is less than the height of the positioning protrusions protruding from the side wall of the outlet of the first pressure relief pipe, and the plurality of blocking protrusions are evenly distributed along the circumference of the outlet of the first pressure relief pipe, or the plurality of blocking protrusions and two positioning protrusions are evenly distributed along the circumference of the outlet of the first pressure relief pipe.

[0021] Preferably, two side walls of the blocking protrusion along the circumference of the outlet of the first pressure relief pipe and a side wall facing the outer side of the outlet of the first pressure relief pipe are inclined surfaces inclined from the outside to the inside.

[0022] Preferably, a sealing ring is provided between the first pressure relief pipe and the second pressure relief pipe.

[0023] Furthermore, a sealing ring installation groove is provided on the outer plate surface of the first pressure relief pipe end plate, the sealing ring installation groove is coaxial with the outlet of the first pressure relief pipe, and the outlet of the first pressure relief pipe is located in the sealing ring installation groove, and the sealing ring is installed in the sealing ring installation groove.

[0024] Preferably, a first stopper is provided on the outer wall of the first pressure relief pipe, and a second stopper is provided on the outer wall of the second pressure relief pipe, and the setting positions of the first stopper and the second stopper are respectively: when the axes of the first pressure relief pipe and the second pressure relief pipe are both horizontal, the two are rotatably connected, and the angles between the first pressure relief pipe end plate and the second pressure relief pipe end plate and the horizontal plane are both 45°, the first stopper is provided at the bottom end of the outer wall of the first pressure relief pipe, the second stopper is provided at the top end of the outer wall of the second pressure relief pipe, and the first stopper and the second stopper are located on the same side of the vertical axial section of the pressure relief pipe, and the side walls of the first stopper and the second stopper facing the vertical axial section of the pressure relief pipe are both located on the vertical axial section of the pressure relief pipe.

[0025] Furthermore, the first stopper and the second stopper are both rectangular protrusions extending outward from the outer wall of the pressure relief pipe where they are located.

[0026] A safety valve group comprises a ball valve, a check valve and a safety valve, wherein the check valve is provided with two medium outlets, the medium outlet of the ball valve is connected to the medium inlet of the check valve, one medium outlet of the check valve is connected to the medium inlet of the safety valve, and the pressure relief port of the safety valve is connected to a pressure relief pipe, and the pressure relief pipe adopts any one of the pressure relief pipes of the safety valve group disclosed in the present invention.

[0027] Preferably, the plug-in structure at the inlet end of the first pressure relief pipe is an elastic plug-in extending outward in an annular shape, and the structure of the elastic plug-in may be the same as that of the elastic clamp, that is, the elastic plug-in is composed of a plurality of arc-shaped elastic teeth evenly distributed along the circumference of the inlet of the first pressure relief pipe, and a spacing is left between adjacent elastic teeth. The elastic teeth include an elastic plate and a hook provided at the outer end of the elastic plate, the hook portion of the hook extends radially outward, and the outer wall of the top end of the hook is a slope.

[0028] The pressure relief port of the safety valve is provided with a limiting structure suitable for the elastic plug-in to be clamped, and the limiting structure is an annular boss extending radially inward, the inner diameter of the annular boss matches the outer diameter of the elastic plate, the width of the annular boss matches the length of the elastic plate, and the side surface of the annular boss facing the outside of the pressure relief port is an annular inclined surface.

[0029] Preferably, the spacings between adjacent elastic teeth are of different shapes, and the annular boss may be provided with protrusions matching the spacings of different shapes.

[0030] The plug-in structure may also be any plug-in structure suitable for quick plug-in between pipes in the prior art.

[0031] Preferably, the medium inlet of the ball valve is vertically downward, the medium outlet of the ball valve is vertically upward, the medium inlet of the check valve is vertically downward, the two medium outlets of the check valve are horizontal, a check valve core is provided in the check valve, the check valve core and the end wall of the medium outlet of the ball valve constitute a check sealing pair, the medium inlet and pressure relief port of the safety valve are horizontal and have different horizontal heights, a horizontal safety valve seat is provided between the medium inlet and the pressure relief port of the safety valve, a vertical safety valve core is provided in the safety valve, and the safety valve core and the safety valve seat constitute a safety valve sealing pair.

[0032] Preferably, the valve bodies of the ball valve, the check valve and the safety valve are of an integrated structure.

[0033] The beneficial effects of the present invention are: (1) Since the first pressure relief pipe and the second pressure relief pipe can rotate relative to each other and can be positioned after rotating 90° relative to each other, the pressure relief pipe can be transformed between a straight pipe and a 90° right-angle elbow, which is suitable for the installation and use of the safety valve group in two situations where the inlet of the water heater is horizontal and vertically downward, and meets the installation requirement that the outlet of the pressure relief pipe of the safety valve group of the water heater must be vertically downward, so that one product can be adapted to the application in two working scenarios, which can not only avoid the user's selection difficulties or purchase errors during procurement, but also reduce the manufacturer's production costs; (2) Since an opening is provided on the wall of the second pressure relief pipe, when the pressure relief pipe is used in the form of a 90° right-angle bend (when installed on the pressure relief port of the safety valve assembly), the opening is connected to the atmosphere, which can effectively eliminate the back pressure formed at the bend of the pressure relief pipe during the pressure relief process, thereby avoiding frequent pressure changes and flow disturbances caused by the back pressure of the medium in the front safety valve, resulting in frequent oscillation of the safety valve core (continuous up and down movement) and pressure relief noise; (3) Due to the arrangement of the guide component in the second pressure relief pipe, the medium entering the second pressure relief pipe can be guided and decompressed during the pressure relief process (the guide plate blocks the medium and reduces the pressure to a certain extent), thereby preventing the medium from being ejected from the opening on the wall of the second pressure relief pipe due to excessive pressure; (4) Due to the arrangement of the matching rotation positioning structure on the side wall of the outlet of the first pressure relief pipe and on the radial outer wall of the elastic clamp, the first pressure relief pipe and the second pressure relief pipe can be quickly rotated and positioned during the relative rotation process to form a straight pipe shape or a 90° right-angle bend pipe shape and always maintain the corresponding shape (with a fixed relative angle), which not only facilitates the operation of the shape change of the pressure relief pipe, but also avoids the first pressure relief pipe and the second pressure relief pipe from forming other angles after relative rotation, which affects the installation and use of the safety valve group; (5) The first pressure relief pipe and the second pressure relief pipe are connected by a plug-in rotational fit, which is convenient for disassembly and assembly and repair and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a structural schematic diagram of an implementation mode of the pressure relief pipe of the present invention; Figure 2 yes Figure 1 A cross-sectional view of a usage form (in a straight tube form) of an implementation method; Figure 3 yes Figure 1 A cross-sectional view of another use form of the embodiment (in the form of a 90° right-angle bend); Figure 4 yes Figure 1 A cross-sectional view of the first pressure relief pipe in an embodiment; Figure 5 yes Figure 1 A cross-sectional view of the second pressure relief pipe in an embodiment; Figure 6 It is a cross-sectional view of a use form of the safety valve assembly of the present invention (the pressure relief pipe is a straight pipe form); Figure 7 It is a cross-sectional view of another usage form of the safety valve assembly of the present invention (the pressure relief pipe is in the form of a 90° right-angle bend pipe). DETAILED DESCRIPTION

[0035] All directional indications in the embodiments of the present invention (such as up, down, top, bottom, inside, outside, etc.) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture (as shown in the accompanying drawings), and do not constitute a limitation on the actual use direction. If the specific posture changes, the directional indication will also change accordingly.

[0036] See also Figure 1-Figure 5 The present invention discloses a pressure relief pipe of a safety valve group, comprising a first pressure relief pipe 1 and a second pressure relief pipe 2, wherein both the first pressure relief pipe and the second pressure relief pipe are straight pipes, the end face of the outlet end of the first pressure relief pipe is an inclined surface and the angle between the first pressure relief pipe and the axis of the first pressure relief pipe is 45°, the end face of the inlet end of the second pressure relief pipe is an inclined surface and the angle between the second pressure relief pipe and the axis of the second pressure relief pipe is 45°, the outlet end of the first pressure relief pipe and the inlet end of the second pressure relief pipe are rotationally connected and provided with a rotation positioning structure, and the pipe wall of the second pressure relief pipe is provided with an opening 3 that penetrates inside and outside. Since the first pressure relief pipe and the second pressure relief pipe can rotate relative to each other, the pressure relief pipe can be transformed between two forms, a straight pipe and a 90° right-angle elbow, which is suitable for the installation and use of the safety valve group in two situations where the inlet of the water heater is horizontal and vertically downward, and meets the installation requirement that the outlet of the pressure relief pipe of the safety valve group of the water heater must be vertically downward, so that one product can be adapted to the application in two working scenarios, which can not only avoid the user's selection difficulties or purchase errors during procurement, but also reduce the manufacturer's production cost. The setting of the opening on the pipe wall of the second pressure relief pipe, when the pressure relief pipe is used in the form of a 90° right-angle bend (when installed on the pressure relief port of the safety valve group), the opening is connected to the atmosphere, which can effectively eliminate the back pressure formed at the bend of the pressure relief pipe during the pressure relief process, and avoid the frequent pressure changes and flow disorder of the medium in the front safety valve due to the back pressure, which leads to frequent oscillation of the safety valve core (continuous up and down movement) and the generation of pressure relief noise.

[0037] The number of the openings is preferably several, and the several openings are evenly distributed along the circumference of the second pressure relief pipe (the same circumferential direction on the pipe wall). The number of the openings is usually two, and the two openings are symmetrically arranged along the circumference of the second pressure relief pipe. The opening can be a rectangular opening.

[0038] The inlet end of the first pressure relief pipe is preferably provided with a plug-in structure suitable for plugging with the pressure relief port of the safety valve group, so as to facilitate the quick connection and disassembly of the pressure relief pipe and the pressure relief port of the safety valve group. The outlet end of the second pressure relief pipe is preferably provided with an external thread suitable for connecting with other pipes or parts, so as to facilitate the quick connection and disassembly with other pipes or parts when needed.

[0039] The outlet end of the first pressure relief pipe is preferably provided with a first pressure relief pipe end plate 4, which is a flat plate, and the angle between its plate surface and the axis of the first pressure relief pipe is 45°. The outlet 5 of the first pressure relief pipe is arranged on the first pressure relief pipe end plate, and the inlet end of the second pressure relief pipe is provided with a second pressure relief pipe end plate 6, which is a flat plate, and the angle between its plate surface and the axis of the second pressure relief pipe is 45°. The inlet 7 of the second pressure relief pipe is arranged on the second pressure relief pipe end plate. The arrangement of the first pressure relief pipe end plate and the second pressure relief pipe end plate facilitates the connection between the outlet end of the first pressure relief pipe and the inlet end of the second pressure relief pipe. The rotational matching connection structure between the outlet end of the first pressure relief pipe and the inlet end of the second pressure relief pipe can be arranged on the first pressure relief pipe end plate and the second pressure relief pipe end plate.

[0040] The second pressure relief pipe is preferably provided with a flow guide component along the axial direction, which is used to guide the medium entering the second pressure relief pipe. The flow guide component preferably includes a flow guide pipe 8 and a flow guide member 9. The flow guide pipe is coaxially arranged in the second pressure relief pipe, and its outer diameter is smaller than the inner diameter of the second pressure relief pipe, and its length is smaller than the length of the second pressure relief pipe. There is a gap between the outer wall of the flow guide pipe and the inner wall of the second pressure relief pipe. The inlet end of the flow guide pipe is fixedly connected to the end plate of the second pressure relief pipe and communicated with the inlet of the second pressure relief pipe. A reinforcing rib (or supporting rib) may be provided between the outer wall of the flow guide pipe and the inner wall of the second pressure relief pipe. The flow guide member is preferably conical and coaxially arranged in the flow guide pipe. The conical end of the flow guide member is located outside the outlet end of the flow guide pipe. The outlet end of the flow guide pipe is preferably located on the inlet end side of the opening facing the second pressure relief pipe, and the projection of the conical end of the flow guide member on the axial section of the second pressure relief pipe is preferably located within the projection of the opening on the axial section of the second pressure relief pipe.

[0041] The guide member is preferably composed of a plurality of guide plates, for example, three or four, each of which is arranged along an axial section of the guide tube, the inner edges of each of which are connected together and located on the axis of the guide tube, the outer edges of each of which are fixedly connected to the inner wall of the guide tube, and the plurality of guide plates are evenly distributed along the circumference of the guide tube, the ends of the guide plates are located outside the outlet end of the guide tube, the outer edges of the end side of the guide plates (the part located outside the outlet end of the guide tube) are bevels inclined from outside to inside, the ends of the bevels of each of the guide plates meet at one point and are located on the axis of the guide tube to form a cone end. The outer edge of the head end side of the guide plate is preferably connected to the wall of the inlet of the second pressure relief tube.

[0042] The setting of the guide component can guide and reduce the pressure of the medium entering the second pressure relief pipe during the pressure relief process (the guide plate has a certain degree of pressure reduction effect on the medium's blocking), thereby preventing the medium from spraying out from the opening on the wall of the second pressure relief pipe due to excessive pressure.

[0043] The inlet wall of the second pressure relief pipe is preferably fixed with an elastic clip 10 suitable for clamping with the outlet of the first pressure relief pipe. The elastic clip is annular and extends outward from the inlet wall of the second pressure relief pipe. The axis of the elastic clip is perpendicular to the plate surface of the second pressure relief pipe end plate. The outer diameter of the elastic clip matches the caliber of the outlet of the first pressure relief pipe, so that after the elastic clip is inserted into the outlet of the first pressure relief pipe, it can rotate in the outlet of the first pressure relief pipe. The elastic clip and the outlet wall of the first pressure relief pipe constitute a rotational matching connection structure between the outlet end of the first pressure relief pipe and the inlet end of the second pressure relief pipe. The first pressure relief pipe and the second pressure relief pipe adopt a plug-in rotational matching connection method, which is convenient for disassembly and assembly and convenient for repair and maintenance.

[0044] The elastic clamp is preferably composed of a plurality of arc-shaped elastic teeth evenly distributed along the circumference of the inlet of the second pressure relief pipe, and a spacing is left between adjacent elastic teeth to facilitate radial elastic deformation of the elastic teeth when subjected to external force. The elastic teeth include an elastic plate and a hook arranged at the outer end of the elastic plate, the hook portion of the hook radially extends outward, the outer diameter of the elastic plate matches the caliber of the outlet of the first pressure relief pipe so that they can rotate relatively after plugging in, the height of the elastic plate matches the thickness of the end plate of the first pressure relief pipe, which is convenient for axial limitation (axial direction of the outlet of the first pressure relief pipe) after plugging in, the outer wall of the top end of the hook is an inclined surface, which is convenient for the elastic tooth to be inserted into the outlet of the first pressure relief pipe, and the bottom surface of the hook is a plane, which is convenient for the elastic clamp to cooperate with the inner wall of the end plate of the first pressure relief pipe after being inserted into the outlet of the first pressure relief pipe to achieve axial limitation of the elastic clamp at the outlet of the first pressure relief pipe.

[0045] The rotation positioning structure preferably includes a positioning protrusion 11 provided on the side wall of the outlet of the first pressure relief pipe and a positioning groove (or notch) provided on the radial outer wall of the elastic clamp and matched with the positioning protrusion. The number of the positioning protrusion and the positioning groove are both two, and they are symmetrically distributed along the circumferential direction on their respective setting wall surfaces. During the relative rotation of the first pressure relief pipe and the second pressure relief pipe, each of the positioning protrusions slides into the corresponding positioning groove, so as to realize the circumferential limit fixation of the elastic clamp relative to the outlet of the first pressure relief pipe, thereby realizing the rotation fixation of the second pressure relief pipe relative to the first pressure relief pipe.

[0046] The two side walls of the positioning protrusion along the circumference of the outlet of the first pressure relief pipe and the side wall facing the outside of the outlet of the first pressure relief pipe are preferably inclined surfaces inclined from outside to inside. Such a configuration facilitates the insertion of the elastic clamp into the outlet of the first pressure relief pipe (the side wall of the positioning protrusion facing the outside of the outlet of the first pressure relief pipe will not cause obvious obstruction to the insertion of the elastic clamp), and the positioning protrusion slides in and out of the positioning groove along the circumferential direction.

[0047] The two positioning protrusions are preferably set at positions on the side wall of the outlet of the first pressure relief pipe corresponding to the top and bottom ends of the first pressure relief pipe end plate, that is, when the axis of the first pressure relief pipe is horizontal and the plate surface of the first pressure relief pipe end plate is at a 45° angle to the horizontal plane, the two positioning protrusions are respectively set at the top and bottom ends of the side wall of the outlet of the first pressure relief pipe, and correspondingly, the two positioning grooves are set at positions on the radial outer wall of the elastic clamp corresponding to the top and bottom ends of the second pressure relief pipe end plate, that is, when the axis of the second pressure relief pipe is horizontal and the plate surface of the second pressure relief pipe end plate is at a 45° angle to the horizontal plane, the two positioning grooves are respectively set at the top and bottom ends of the radial outer wall of the elastic clamp. With such arrangement, when the two positioning protrusions are positioned in the two positioning grooves, the axis of the first pressure relief pipe and the axis of the second pressure relief pipe are in a straight line, the pressure relief pipe is in the form of a straight pipe, and the first pressure relief pipe and the second pressure relief pipe are rotated relative to each other so that the two positioning protrusions slide out of the two positioning grooves and then slide into the two positioning grooves again for positioning, the axis of the first pressure relief pipe is perpendicular to the axis of the second pressure relief pipe, the pressure relief pipe is in the form of a 90° right-angle bend, and after the two positioning protrusions are positioned in the two positioning grooves, the pressure relief pipe can only be maintained in the form of a straight pipe or a 90° right-angle bend, and will not form other angles to affect the installation and use of the safety valve group.

[0048] A plurality of blocking protrusions 12 may be provided on the side wall of the outlet of the first pressure relief pipe, the height of the blocking protrusion protruding from the side wall of the outlet of the first pressure relief pipe is less than the height of the positioning protrusion protruding from the side wall of the outlet of the first pressure relief pipe, the plurality of blocking protrusions are evenly distributed along the circumference of the outlet of the first pressure relief pipe, or the plurality of blocking protrusions and two positioning protrusions are evenly distributed along the circumference of the outlet of the first pressure relief pipe. The provision of the blocking protrusions can always press the circumferential side wall of the elastic clip during the process of inserting the elastic clip into the outlet of the first pressure relief pipe and during the rotation process after the insertion into the outlet of the first pressure relief pipe, so that the circumferential side wall of the elastic clip always maintains a certain degree of elastic deformation radially inward, which facilitates the insertion and rotation of the elastic clip relative to the outlet of the first pressure relief pipe.

[0049] The two side walls of the blocking protrusion along the circumference of the outlet of the first pressure relief pipe and the side wall facing the outside of the outlet of the first pressure relief pipe are preferably inclined surfaces inclined from outside to inside. Such a configuration facilitates the insertion of the elastic clip into the outlet of the first pressure relief pipe and the rotation after insertion into the outlet of the first pressure relief pipe.

[0050] A sealing ring 13 is preferably provided between the first pressure relief pipe and the second pressure relief pipe to prevent leakage of the medium during the pressure relief process. A sealing ring installation groove can be provided on the outer plate surface of the first pressure relief pipe end plate, the sealing ring installation groove is coaxial with the outlet of the first pressure relief pipe, and the outlet of the first pressure relief pipe is located in the sealing ring installation groove, and the sealing ring is installed in the sealing ring installation groove.

[0051] A first stopper 14 is preferably provided on the outer wall of the first pressure relief pipe, and a second stopper 15 is preferably provided on the outer wall of the second pressure relief pipe. The setting positions of the first stopper and the second stopper are preferably respectively: when the axes of the first pressure relief pipe and the second pressure relief pipe are both horizontal, the two are rotationally matched and connected, and the angles between the first pressure relief pipe end plate and the second pressure relief pipe end plate and the horizontal plane are both 45°, the first stopper is provided at the bottom end of the outer wall of the first pressure relief pipe, the second stopper is provided at the top end of the outer wall of the second pressure relief pipe, and the first stopper and the second stopper are located on the same side of the vertical axial section of the pressure relief pipe, and the side walls of the first stopper and the second stopper facing the vertical axial section of the pressure relief pipe are both located on the vertical axial section of the pressure relief pipe. The length of the first stopper extending out of the outer wall of the first pressure relief pipe is greater than the distance between the first stopper and the first pressure relief pipe end plate, the length of the second stopper extending out of the outer wall of the second pressure relief pipe is greater than the distance between the second stopper and the second pressure relief pipe end plate, and the distance between the first stopper and the first pressure relief pipe end plate is the same as the distance between the second stopper and the second pressure relief pipe end plate. In this way, in the process of rotating the first pressure relief pipe and the second pressure relief pipe, when the second pressure relief pipe rotates to a position where its axis is perpendicular to the axis of the first pressure relief pipe (the pressure relief pipe is in the form of a 90° right-angle bend pipe), in addition to the two positioning protrusions of the rotation positioning structure sliding into the corresponding positioning grooves, the second stopper abuts against the corresponding side of the first stopper, playing an auxiliary role in the rotation positioning between the first pressure relief pipe and the second pressure relief pipe. Both the first stopper and the second stopper can be rectangular protrusions extending outward from the outer wall of the pressure relief pipe where they are located.

[0052] See also Figure 6 and Figure 7The present invention also discloses a safety valve group, including a ball valve, a check valve and a safety valve, wherein the check valve is provided with two medium outlets, the medium outlet of the ball valve is connected to the medium inlet of the check valve, one medium outlet of the check valve is connected to the medium inlet of the safety valve, and the pressure relief port of the safety valve is connected to a pressure relief pipe, and the pressure relief pipe adopts any one of the pressure relief pipes of the safety valve group disclosed in the present invention.

[0053] The plug-in structure at the inlet end of the first pressure relief pipe is preferably an elastic plug-in 16 extending outward in an annular shape. The structure of the elastic plug-in may be the same as that of the elastic clamp, that is, the elastic plug-in is composed of a plurality of arc-shaped elastic teeth evenly distributed along the circumference of the inlet of the first pressure relief pipe, with spacing between adjacent elastic teeth. The elastic teeth include an elastic plate and a hook provided at the outer end of the elastic plate, the hook portion of the hook extending radially outward, and the outer wall of the top end of the hook is an inclined surface, which is convenient for insertion into the pressure relief port of the safety valve.

[0054] Correspondingly, the pressure relief port of the safety valve is provided with a limiting structure suitable for the elastic plug-in to be clamped, and the limiting structure is preferably an annular boss 17 extending radially inward, the inner diameter of the annular boss matches the outer diameter of the elastic plate, the width of the annular boss matches the length of the elastic plate, and the side surface of the annular boss facing the outside of the pressure relief port is an annular inclined surface, which is convenient for the insertion of the elastic plug-in.

[0055] The spacing shapes between adjacent elastic teeth may be different, and the annular boss may be provided with protrusions matching the spacings of different shapes. With such a configuration, when the inlet end of the first pressure relief pipe is inserted into the pressure relief port of the safety valve and rotated relatively, the protrusions of different shapes are inserted into the conforming spacing between the elastic teeth to achieve the circumferential positioning between the first pressure relief pipe and the pressure relief port of the safety valve. By appropriately setting the spacing positions of different shapes between the elastic teeth and the positions of the protrusions of different shapes on the annular boss, after the first pressure relief pipe and the pressure relief port of the safety valve are positioned in the circumferential direction, the angle between the plate surface of the first pressure relief pipe end plate and the horizontal plane is 45°.

[0056] The plug-in structure may also be any plug-in structure suitable for quick plug-in between pipes in the prior art.

[0057] A preferred implementation of the structure of the ball valve, the check valve and the safety valve is as follows: the valve body 18 of the ball valve is vertically arranged, and is provided with a ball valve medium inlet and a ball valve medium outlet, the ball valve medium inlet is vertically downward, the ball valve medium outlet is vertically upward, and the axes of the ball valve medium inlet and the ball valve medium outlet are on the same vertical straight line, a valve ball 19 is provided in the vertical channel of the ball valve, the ball valve medium outlet is provided with an annular flange extending radially inward, the ball valve medium inlet is threadedly connected to a medium inlet pipe (the inner wall of the ball valve medium inlet is provided with an internal thread, and the top outer wall of the medium inlet pipe is provided with an external thread matching the internal thread) 20, the top end of the medium inlet pipe is located in the ball valve medium inlet, and the valve ball is provided Between the top end of the medium inlet pipe and the annular flange (a suitable sealing member is provided), the top wall of the medium inlet pipe and the bottom wall of the annular flange constitute a valve seat, and the valve ball is provided with a switch handle located outside the valve body of the ball valve; the valve body 21 of the check valve is vertically arranged, and is provided with a check valve medium inlet and two check valve medium outlets, the check valve medium inlet is vertically downward and is coaxially connected with the ball valve medium outlet, the two check valve medium outlets are both horizontal, and the axes are on the same horizontal straight line, the two check valve medium outlets are both connected with the check valve medium inlet, one of which is used to connect the safety valve, and the other is used to connect the inlet of the water heater, and the valve body of the check valve has a vertically detachable installation (for example, a threaded connection) A check valve cover 22, the check valve cover is cylindrical, with a closed top and an open bottom, the bottom end of the check valve cover is against the top surface of the annular flange (provided with a suitable sealing member), the inner diameter of the check valve cover is larger than the inner diameter of the annular flange, the top surface of the annular flange serves as the valve seat of the check valve, the side wall of the check valve cover adopts a frame structure, which does not affect the communication between the check valve medium inlet and the two check valve outlets, a check valve core 23 is provided in the check valve cover, the top end of the check valve core is connected to a vertical check valve stem 24 or is an integral structure with the check valve stem, a vertical downward guide sleeve 25 is coaxially provided on the top surface of the check valve cover, the length of the guide sleeve is smaller than the vertical height of the check valve cover, and the check valve stem is plugged into the check valve cover. In the guide sleeve and in vertical sliding cooperation with the guide sleeve, the check valve rod and the outer sleeve of the guide sleeve are provided with a check valve spring 26, the check valve spring is a cylindrical spring, the top end of the check valve spring is against the top surface in the check valve cover, and the bottom end of the check valve spring is against the check valve core; the valve body 27 of the safety valve is vertically arranged, and is provided with a safety valve medium inlet and a pressure relief port, the safety valve medium inlet and the pressure relief port are both horizontally arranged, the upper part of the valve body of the safety valve is detachably connected (for example, threaded connection) with a safety valve cover 28, a horizontal safety valve seat is provided in the safety valve, the safety valve seat divides the valve cavity of the safety valve into an upper cavity and a lower cavity, the safety valve medium inlet is communicated with the lower cavity, and the pressure relief port is communicated with the upper cavity,The outer end of the safety valve medium inlet is connected to a check valve medium outlet (used to connect the check valve medium outlet of the safety valve), the pressure relief port is connected to the pressure relief pipe, a safety valve core 29 is arranged in the upper cavity, the safety valve core is in the shape of a cylinder with an open top and a closed bottom, a vertical safety valve stem 30 is coaxially connected to the safety valve core, the outer diameter of the safety valve stem is smaller than the inner diameter of the safety valve core, the safety valve stem extends into the safety valve core from top to bottom, and its bottom end is fixedly connected to the bottom wall of the safety valve core, or the safety valve stem and the safety valve core are an integral structure, a conformable rubber sleeve 31 is arranged on the outer sleeve of the safety valve core, the outer edge of the rubber sleeve is provided with an outward flange, and the inner wall of the upper cavity is provided with an inwardly extending annular flange, the bottom end of the safety valve cover abuts against the annular flange, the flange of the rubber sleeve is fixedly clamped between the bottom end of the safety valve cover and the annular flange, a through hole penetrating inside and outside is provided at the center of the top wall of the safety valve cover, a guide sleeve 32 vertically downward is provided on the hole wall of the through hole, the safety valve stem is inserted into the guide sleeve and slidably cooperates between the guide sleeves, the top end of the safety valve stem extends upward out of the safety valve cover, a safety valve spring 33 is sleeved on the safety valve stem, the safety valve spring is a cylindrical spring, the top end of the safety valve spring abuts against the top wall of the safety valve cover, the bottom end of the safety valve spring abuts against the bottom wall of the safety valve core, and a rotating handle 3 is coaxially sleeved on the safety valve cover 4. The rotating handle is in an inverted cup shape. The outer wall of the safety valve cover is provided with a radially outward annular boss. The rotating handle and the safety valve cover are rotatably matched. The outer wall of the safety valve cover is provided with a plurality of radially outward protrusions along the circumferential direction. The bottom surface of the protrusion is located on the annular boss or is integrated with the annular boss. The inner wall of the rotating handle is provided with an inclined surface inclined from bottom to top along the circumferential direction with the same number and corresponding to the setting position of the protrusions, so that when the rotating handle is rotated, the rotating handle can move axially relative to the safety valve cover. The upper part of the rotating handle is provided with a radially inward annular flange. The inner diameter of the annular flange is the same as the inner diameter of the guide sleeve. The top end of the safety valve stem extends upward. The annular flange is protruded and slides with the inner wall of the annular flange or leaves a sliding gap. The top of the safety valve stem is set into a symmetrical vertical two-petal structure, with a spacing between the two petals. The top of each petal is provided with a hook protruding radially outward, and the bottom surface of the hook is clamped on the top surface of the annular flange. The top of the rotating handle is open, and an annular step surface is provided in the opening or a plurality of protrusions protruding radially inward are evenly distributed along the circumference. A cover plate 35 is provided on the top surface of the annular step surface or the plurality of protrusions. A vertical downward plug rod is provided at the center of the bottom surface of the cover plate. The outer diameter of the plug rod is greater than the spacing between the two petals at the top of the safety valve stem, and the plug rod is inserted between the two petals at the top of the safety valve stem.

[0058] The ball valve, the check valve and the safety valve may also be any ball valve, check valve and safety valve suitable for pressure systems such as water supply or heating in the prior art.

[0059] The valve bodies of the ball valve, the check valve and the safety valve preferably adopt an integrated structure.

[0060] The safety valve group is applied to the inlet end or the inlet end side of the water heater (the medium outlet of the check valve used to connect the water heater is connected to the inlet of the water heater), and the working process is: the valve ball is rotated by the switch handle to open the ball valve, and water enters the ball valve from the medium inlet of the ball valve. Under the pressure of the water, the check valve core moves vertically upward, the check valve opens, and water enters the valve cavity of the check valve. The safety valve is preset with an opening pressure (greater than the pressure of water entering the ball valve from the medium inlet of the ball valve under normal conditions), the safety valve remains in a closed state, and water enters the water heater from the medium outlet of the check valve connected to the water heater. When the pressure in the water heater increases and is greater than the pressure of the water entering the medium inlet of the ball valve, the water in the water heater flows back into the valve cavity of the check valve. Under the pressure of the water flowing back into the valve cavity of the check valve, the check valve core moves vertically downward to seal the check valve seat, and the check valve is closed. The water flowing back into the valve cavity of the check valve flows into the lower cavity of the safety valve. Under the pressure of the water, the safety valve core moves vertically upward, the safety valve opens, and the water enters the upper cavity of the safety valve and is discharged through the pressure relief port and the pressure relief pipe to relieve pressure. When the pressure of the water in the water heater drops below the preset opening pressure of the safety valve, the safety valve core moves vertically downward under the action of the safety spring, seals the safety valve seat, and the safety valve is closed. When it is necessary to drain the water in the water heater, close the ball valve, turn the rotating handle, manually open the safety valve, and the water in the water heater is discharged through the pressure relief port and the pressure relief pipe.

[0061] The safety valve group has the functions of limiting the pressure in the water heater, preventing the water in the water heater from flowing back to the main circuit (the pipeline in front of the ball valve), preventing the discharged water from contacting the water in the water heater and draining the water in the water heater (to facilitate the repair and maintenance of the water heater).

[0062] The pressure relief pipe of any safety valve group of the present invention can be used for any safety valve group of the present invention.

[0063] Any safety valve assembly of the present invention may also adopt the pressure relief pipe of any safety valve assembly of the present invention.

[0064] Unless otherwise specified or one preferred or optional technical means is a further limitation of another technical means, all preferred and optional technical means disclosed in the present invention can be arbitrarily combined to form several different technical solutions.

Claims

1. The pressure relief pipe of the safety valve group is characterized by It includes a first pressure relief pipe and a second pressure relief pipe, the end face of the outlet end of the first pressure relief pipe is a slope and the angle between it and the axis of the first pressure relief pipe is 45°, the end face of the inlet end of the second pressure relief pipe is a slope and the angle between it and the axis of the second pressure relief pipe is 45°, the outlet end of the first pressure relief pipe and the inlet end of the second pressure relief pipe are rotationally connected and provided with a rotation positioning structure, and the pipe wall of the second pressure relief pipe is provided with an opening that penetrates inside and outside.

2. The pressure relief pipe of the safety valve assembly according to claim 1, characterized in that The number of the openings is multiple, and the multiple openings are evenly distributed along the circumference of the second pressure relief pipe.

3. The pressure relief pipe of the safety valve assembly according to claim 1, characterized in that A flow guide component is axially arranged in the second pressure relief pipe.

4. The pressure relief pipe of the safety valve assembly according to claim 3, characterized in that The outlet end of the first pressure relief pipe is provided with a first pressure relief pipe end plate, the outlet of the first pressure relief pipe is arranged on the first pressure relief pipe end plate, the inlet end of the second pressure relief pipe is provided with a second pressure relief pipe end plate, and the inlet of the second pressure relief pipe is arranged on the second pressure relief pipe end plate.

5. The pressure relief pipe of the safety valve assembly according to claim 4, characterized in that The flow guide assembly includes a flow guide pipe and a flow guide member. The flow guide pipe is coaxially arranged in the second pressure relief pipe, and its outer diameter is smaller than the inner diameter of the second pressure relief pipe, and its length is smaller than the length of the second pressure relief pipe. The inlet end of the flow guide pipe is fixedly connected to the end plate of the second pressure relief pipe and is connected to the inlet of the second pressure relief pipe. The flow guide member is conical and coaxially arranged in the flow guide pipe. The conical end of the flow guide member is located outside the outlet end of the flow guide pipe.

6. The pressure relief pipe of the safety valve assembly according to claim 5, characterized in that The guide member is composed of a plurality of guide plates, each of which is arranged along an axial section of the guide tube, the inner edges of each of the guide plates are connected together and located on the axis of the guide tube, the outer edges of each of the guide plates are fixedly connected to the inner wall of the guide tube, and the plurality of guide plates are evenly distributed along the circumference of the guide tube, the end of the guide plate is located outside the outlet end of the guide tube, and the outer edge of the end side of the guide plate is a beveled edge inclined from the outside to the inside.

7. The pressure relief pipe of the safety valve assembly according to claim 6, characterized in that An elastic clamping piece suitable for clamping with the outlet of the first pressure relief pipe is fixedly provided on the mouth wall of the inlet of the second pressure relief pipe. The elastic clamping piece is annular and extends outward from the mouth wall of the inlet of the second pressure relief pipe. The axis of the elastic clamping piece is perpendicular to the plate surface of the end plate of the second pressure relief pipe. The outer diameter of the elastic clamping piece matches the caliber of the outlet of the first pressure relief pipe. The elastic clamping piece and the mouth wall of the outlet of the first pressure relief pipe constitute a rotationally matched connection structure between the outlet end of the first pressure relief pipe and the inlet end of the second pressure relief pipe.

8. The pressure relief pipe of the safety valve assembly according to claim 7, characterized in that The rotation positioning structure includes a positioning protrusion arranged on the side wall of the outlet of the first pressure relief pipe and a positioning groove arranged on the radial outer wall of the elastic clamp and matching with the positioning protrusion. The number of the positioning protrusion and the number of the positioning groove are both two, which are symmetrically distributed along the circumferential direction on their respective setting wall surfaces.

9. Safety valve group, characterized by It includes a ball valve, a check valve and a safety valve, the check valve is provided with two medium outlets, the medium outlet of the ball valve is connected to the medium inlet of the check valve, one medium outlet of the check valve is connected to the medium inlet of the safety valve, the pressure relief port of the safety valve is connected to a pressure relief pipe, and the pressure relief pipe adopts the pressure relief pipe of the safety valve group described in any one of claims 1-8.

10. The safety valve assembly according to claim 9, characterized in that The valve bodies of the ball valve, the check valve and the safety valve adopt an integrated structure.

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