Anti-disengagement PPR equipotential internal thread elbow
Through the design of the interference fit between the annular cover plate and the shell and the fixing part, the problem of the PPR equipotential inner wire elbow disengagement in the temperature difference environment is solved, the tight connection between the insert and the shell is achieved, and the stability and safety of the water pipe system are improved.
Patent Information
- Application Number
- CN202422138588.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-30
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-08-30
AI Technical Summary
In the long-term use of traditional PPR equipotential inner wire elbow, the plastic shell and the metal insert are easily disconnected, affecting the stability of the water pipe system.
The design of the annular cover plate interfering with the shell is adopted. The outer wall of the insert is fully fitted with the inner wall of the shell and is fixed by a fixing part and threaded connection. The annular cover plate applies clamping force to the insert in the radial and axial direction to limit its displacement and expansion, and combines the metal connector and the fixing block to enhance stability.
It improves the close contact between the insert and the shell, reduces the risk of disengagement, enhances the stability and safety of the water pipe system, and prevents the shell from cracking due to thermal expansion or water flow impact.
Smart Images
Figure CN223076539U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of PPR pipe materials, and particularly relates to a PPR equipotential female elbow which can prevent disconnection. Background Art
[0002] Compared with traditional pipes such as cast iron pipes, galvanized steel pipes, and cement pipes, PPR pipes have the advantages of energy conservation, material saving, environmental protection, light weight, high strength, corrosion resistance, smooth inner wall without scaling, simple construction and maintenance, and long service life. They are widely used in the fields of construction, municipal administration, industry, and agriculture, such as building water supply and drainage, urban and rural water supply and drainage, urban gas, power and optical cable sheaths, industrial fluid transportation, and agricultural irrigation.
[0003] With the continuous progress of modern building and home decoration technologies, the role of PPR equipotential female elbows in the water pipe system has become increasingly prominent. However, in the environment where the water supply temperature difference is relatively large during long-term use, for traditional metal-plastic composite PPR equipotential female elbows, since the thermal expansion coefficient of plastic is greater than that of metal, when the elbow is heated, the expansion degree of the plastic shell is greater than that of the metal insert, and the fit between the plastic shell and the metal insert is not tight enough, which easily leads to the disconnection of the metal insert from the plastic shell, seriously affecting the stability of the water pipe system. Summary of the Utility Model
[0004] One of the purposes of the utility model is to provide a PPR equipotential female elbow which can prevent disconnection, so as to solve the problem that the metal insert and the plastic shell of the female elbow in the prior art are easy to disconnect.
[0005] In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:
[0006] A PPR equipotential female elbow which can prevent disconnection, comprising a shell, an insert and an annular cover plate. The cavity inside the shell forms a water flow channel. The water flow channel includes a water inlet part, an arc part and a water outlet part which are connected in sequence. The insert is installed at the water outlet part. The outer wall of the insert is completely attached to the inner wall of the shell. The insert is also provided with a fixing part for fixing it on the inner wall of the shell. The insert is used for connecting a faucet. The annular cover plate is provided with a first ring plate, and the first ring plate is installed on the shell and is in interference fit with the outer wall of the shell. The annular cover plate abuts against one end of the insert away from the arc part.
[0007] In the above technical solution, when the faucet switch is turned on, water flows into the internal thread elbow from the water inlet, and the direction of the water flow changes when passing through the arc portion and flows into the water outlet. After passing through the water outlet, the water flows out from the faucet installed in the embedded component. The outer wall of the embedment is completely fitted with the inner wall of the shell and a fixing part is provided on the outer wall of the embedment, so the embedment can be fixed to the inner wall of the shell and has better stability. The interference fit between the first ring plate of the annular cover plate and the outer wall of the shell will generate a radial clamping force on the shell, limiting the displacement and expansion of the shell caused by heat. Under the clamping force of the first ring plate, the shell will generate a radial clamping force on the embedment, so the embedment is in closer contact with the shell in the radial direction, the embedment is more difficult to be detached from the shell, and the stability is better. The annular cover plate presses against the end of the embedment away from the arc-shaped part, and applies an axial clamping force to the embedment, limiting the displacement and deformation of the embedment caused by heat, making the embedment and the shell in closer contact in the axial direction, the embedment is more difficult to be detached from the shell, and the stability is better. At the same time, the annular cover plate can also reduce the cracking of the shell due to its own excessive expansion or long-term impact of water flow, so that the stability of the entire water pipe system is better.
[0008] Preferably, an annular groove is provided on one end of the shell near the annular cover plate, a first slope surface is provided on the first annular plate, a second slope surface corresponding to the first slope surface is provided in the annular groove, the first annular plate is installed in the annular groove, and the first slope surface and the second slope surface fit each other. The setting of the first slope surface allows the first slope surface to contact the shell first when the annular cover plate is installed, and the first annular plate is deformed and installed in the annular groove under the supporting force of the shell, without the need to manually pry the first annular plate apart for installation, so that the annular cover plate is easier to install in the annular groove, and is more convenient. The setting of the second slope surface in the annular groove can cooperate with the first slope surface, so that the annular cover plate and the shell fit more closely, the fixing effect of the insert in the inner wall of the shell is better, and the insert is more difficult to detach from the shell.
[0009] Preferably, the annular cover plate further comprises a second annular plate, and the second annular plate is threadedly connected to the inner wall of the insert. The second annular plate provides a reverse supporting force when the first annular plate clamps the shell and the insert, and cooperates with the first annular plate to clamp the insert and the shell, limiting the displacement and expansion of the shell caused by heat, so that the insert and the inner wall of the shell fit more closely, and the threaded connection realizes the axial fixation of the annular cover plate, increases the axial pressing force of the annular cover plate on the insert, limits the displacement and expansion of the shell caused by heat, so that the insert and the inner wall of the shell fit more closely, and the insert is more difficult to detach from the shell, and has better stability.
[0010] Preferably, the inner wall of the insert is distributed in a stepped manner, forming a first cylindrical wall and a second cylindrical wall respectively. The second cylindrical wall is closer to the arc portion than the first cylindrical wall in the axial direction. The axis of the first cylindrical wall and the axis of the second cylindrical wall are on the same straight line. The inner diameter of the first cylindrical wall is greater than the inner diameter of the second cylindrical wall. The inner diameter of the second cylindrical wall is not greater than the inner diameter of the annular cover plate. Threads are provided on the second cylindrical wall. With the stepped setting of the inner wall of the shell, the faucet can be directly installed on the second cylindrical wall. Due to the restrictions on the axes and inner diameters of the first cylindrical wall and the second cylindrical wall, the faucet will not be stuck by the annular cover plate during disassembly and assembly, and the faucet can be disassembled and assembled without removing the annular cover plate, which is more convenient.
[0011] Preferably, the inner wall of the insert further includes a third cylindrical wall. The third cylindrical wall is closer to the arc portion than the second cylindrical wall in the axial direction. The inner diameter of the third cylindrical wall is smaller than the inner diameter of the second cylindrical wall. The axis of the third cylindrical wall and the axis of the second cylindrical wall are on the same straight line. The third cylindrical wall can play a role in limiting the faucet, avoiding damage to the external thread of the faucet caused by excessive screwing of the faucet.
[0012] Preferably, the fixing portion includes a plurality of convex rings and a plurality of convex blocks. The axis of the convex ring is on the same straight line as the axis of the first cylindrical wall. The plurality of convex blocks are located at one end of the insert away from the annular cover plate and are evenly distributed in the circumferential direction. The convex ring strengthens the axial fixation of the insert on the inner wall of the shell. The convex blocks also limit the circumferential rotation of the insert, making the fixation effect of the insert on the inner wall of the shell better, making it more difficult for the insert to break away from the shell, and having better stability.
[0013] Preferably, it further includes a metal connecting piece and a fixing block. An installation groove is provided at one end of the insert close to the annular cover plate. One end of the metal connecting piece is fixed in the installation groove, and the other end is connected to the fixing block. The metal connecting piece can achieve the equipotential connection of the elbow, preventing the occurrence of dangerous touch voltage, and having better safety. The fixing block can fix the whole internal thread elbow on an external fixture, and has better stability.
[0014] Preferably, the metal connector is strip-shaped and extends along the axis of the insert and away from the annular cover plate. One end of the fixing block away from the metal connector is flush with the bottom end of the housing, and a threaded hole is provided on the fixing block. The strip-shaped metal connector has a certain strength and stiffness, which can provide support for the housing. The bolt can pass through the threaded hole and be fixedly connected to an external fixture, thereby fixing the entire female elbow in place, resulting in better stability. At the same time, the fixing block can cooperate with the bolt to clamp the grounding wire on the fixing block, reducing the occurrence of the grounding wire falling off and improving stability. One end of the fixing block away from the metal connector is flush with the bottom end of the housing. When the fixing block is installed on a fixing surface, the bottom end of the housing also contacts the fixing surface. The frictional force between the housing and the fixing surface makes the fixing effect of the female elbow better and the stability better.
[0015] Preferably, a clamping portion is further provided on the outer wall of the housing, and the clamping portion is used to strengthen the fixation between the housing and the metal connector. This increases the contact points between the housing and the metal connector, resulting in a better fixing effect and better stability between the metal connector and the housing.
[0016] Preferably, the housing and the insert are integrally formed by welding. This makes the connection between the insert and the housing tighter, making it more difficult for the insert to break away from the housing, improving stability. At the same time, it reduces the leakage of water from the gap between the inner wall of the housing and the insert, enhancing the anti-leakage performance.
[0017] The beneficial effects of the present utility model are as follows: The interference fit between the first ring plate of the annular cover plate and the outer wall of the housing generates a radial clamping force on the housing, restricting the displacement and expansion of the housing due to heat. Under the clamping force of the first ring plate, the housing generates a radial clamping force on the insert. Therefore, the insert is in closer contact with the housing in the radial direction, making it more difficult for the insert to break away from the housing, improving stability. The annular cover plate abuts against one end of the insert away from the arc portion, applying an axial pressing force on the insert, restricting the axial displacement of the insert, making the insert and the housing in closer contact in the axial direction, making it more difficult for the insert to break away from the housing, improving stability. At the same time, the annular cover plate can also reduce the occurrence of cracking of the housing due to its own excessive expansion or long-term impact of water flow, making the stability of the entire water pipe system better. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 is a schematic structural view of a PPR equipotential female elbow with anti-disengagement according to the present utility model;
[0019] Figure 2 is a schematic internal structural view of a PPR equipotential female elbow with anti-disengagement according to the present utility model;
[0020] Figure 3Explosion diagram of an anti-disconnection PPR equipotential female elbow of the present utility model.
[0021] Wherein: 1. Housing; 101. Water inlet part; 102. Arc part; 103. Water outlet part; 104. Annular groove; 1041. Second inclined plane; 105. Clamping part; 2. Insertion part; 201. Fixed part; 2011. Convex ring; 2012. Convex block; 202. First cylindrical wall; 203. Second cylindrical wall; 204. Third cylindrical wall; 205. Installation groove; 3. Annular cover plate; 301. First ring plate; 3011. First inclined plane; 302. Second ring plate; 4. Metal connecting piece; 5. Fixed block; 501. Threaded hole. Specific implementation manner
[0022] The following will describe the implementation manners of the present utility model with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. The present utility model can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present utility model. It should be understood that the preferred embodiments are only for explaining the present utility model and not for limiting the protection scope of the present utility model.
[0023] It should be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present utility model in a schematic manner. Therefore, only the components related to the present utility model are shown in the drawings, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and ratio of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.
[0024] Embodiment 1
[0025] As Figures 1-3Shown is Embodiment 1 of a PPR equipotential female elbow that prevents disconnection, including a housing 1, an insert 2 for connecting a faucet, and an annular cover plate 3. The housing 1 and the insert 2 are integrally formed by welding. The cavity inside the housing 1 forms a water flow channel, which includes a water inlet portion 101, an arc portion 102, and a water outlet portion 103 that are sequentially connected. The insert 2 is installed at the water outlet portion 103, and the outer wall of the insert 2 is completely attached to the inner wall of the housing 1. The insert 2 is provided with a fixing portion 201 for fixing it to the inner wall of the housing 1. In this embodiment, the fixing portion 201 includes four convex rings 2011 and eight convex blocks 2012. The axes of the four convex rings 2011 are on the same straight line as the axis of the first cylindrical wall 202. The eight convex blocks 2012 are located at one end of the insert 2 away from the annular cover plate 3 and are evenly distributed circumferentially. In addition, the convex blocks 2012 can also be located at non-end positions on the insert 2, and the axes of the convex rings 2011 can also be non-collinear with the axis of the first cylindrical wall 202. The inner wall of the insert 2 is distributed in a stepped manner, respectively forming a first cylindrical wall 202 and a second cylindrical wall 203. The second cylindrical wall 203 is closer to the arc portion 102 in the axial direction than the first cylindrical wall 202. The axes of the first cylindrical wall 202 and the second cylindrical wall 203 are on the same straight line. The inner diameter of the first cylindrical wall 202 is larger than the inner diameter of the second cylindrical wall 203, and the inner diameter of the second cylindrical wall 203 is not larger than the inner diameter of the annular cover plate 3. Threads are provided on both the first cylindrical wall 202 and the second cylindrical wall 203. The annular cover plate 3 further includes a first ring plate 301 and a second ring plate 302. The first ring plate 301 is installed on the housing 1 and is in interference fit with the outer wall of the housing 1. The annular cover plate 3 abuts against one end of the insert 2 away from the arc portion 102. An annular groove 104 is provided at one end of the housing 1 close to the annular cover plate 3. A first inclined surface 3011 is provided on the first ring plate 301, and a second inclined surface 1041 corresponding to the first inclined surface 3011 is provided in the annular groove 104. The first ring plate 301 is installed in the annular groove 104, and the first inclined surface 3011 and the second inclined surface 1041 are in mutual contact. The second ring plate 302 is threadedly connected to the first cylindrical wall 202 of the insert 2, and the faucet is threadedly connected to the second cylindrical wall 203.
[0026] When the faucet switch is turned on, water flows from the water inlet 101 into the internal thread elbow. When passing through the arc portion 102, the direction of the water flow changes and flows into the water outlet 103. After passing through the water outlet 103, the water flows out from the faucet installed in the insert 2. The fixing portion 201 includes a convex ring 2011 and a protrusion 2012. The convex ring 2011 strengthens the axial fixation of the insert 2 on the inner wall of the shell 1. The protrusion 2012 also limits the circumferential rotation of the insert 2, so that the fixation effect of the insert 2 on the inner wall of the shell 1 is better, the insert 2 is more difficult to be detached from the shell 1, and the stability is better. The first ring plate 301 of the annular cover plate 3 is interference fit with the shell 1 to generate a clamping force, which limits the displacement and expansion of the shell 1 caused by heat, so that the insert 2 and the shell 1 are in closer contact. At the same time, a pressing force is applied to the insert 2 in the axial direction, so that the fixation effect of the insert 2 on the inner wall of the shell 1 is better, and the insert 2 is more stable. The insert 2 is more difficult to be detached from the shell 1 and has better stability. The second ring plate 302 is threadedly connected to the inner wall of the insert 2. The second ring plate 302 will provide a reverse supporting force when the first ring plate 301 clamps the shell 1 and the insert 2, and cooperates with the first ring plate 301 to clamp the insert 2 and the shell 1, so that the insert 2 and the inner wall of the shell 1 fit more closely, and the insert 2 is more difficult to be detached from the shell 1. At the same time, the threaded connection realizes the axial fixation of the annular cover plate 3, so that the insert 2 and the inner wall of the shell 1 fit more closely, and the axial fit of the insert 2 and the shell 1 makes it more difficult for the insert 2 to be detached from the shell 1. When the annular cover plate 3 is installed, the first slope surface 3011 will first contact the shell 1. Under the supporting force of the shell 1, the first ring plate 301 is deformed and installed in the annular groove 104. There is no need to manually pry the first ring plate 301 apart before installing it. The annular cover plate 3 is easier to install in the annular groove 104, which is more convenient. The second slope surface 1041 in the annular groove 104 can cooperate with the first slope surface 3011, so that the annular cover plate 3 and the shell 1 fit more tightly. The stepped inner wall of the shell 1 allows the faucet to be directly installed on the second cylindrical wall 203. The restrictions on the axis and inner diameter of the first cylindrical wall 202 and the second cylindrical wall 203 prevent the faucet from being stuck by the annular cover plate 3 when it is disassembled. The faucet can be disassembled without disassembling the annular cover plate 3, which is more convenient.
[0027] Advantages of this embodiment: The housing 1 and the insert 2 are integrally formed by welding, which makes the processing and manufacturing of the internal-thread elbow convenient, and it is more difficult for the insert 2 to break away from the housing 1. The first ring plate 301 of the annular cover plate 3 is in interference fit with the housing 1 to generate a clamping force, which restricts the displacement and expansion of the housing 1 caused by heat, makes the contact between the insert 2 and the housing 1 closer, and at the same time applies a pressing force to the insert 2 axially, so that the fixing effect of the insert 2 on the inner wall of the housing 1 is better, it is more difficult for the insert 2 to break away from the housing 1, and the stability is better. The design of the first inclined surface 3011, the second inclined surface 1041 and the annular groove 104 makes it easier to install the annular cover plate 3 into the annular groove 104, with better convenience. The second ring plate 302 cooperates with the first ring plate 301 to clamp the insert 2 and the housing 1, so that the insert 2 fits more closely to the inner wall of the housing 1. The stepped setting of the inner wall of the housing 1 makes the disassembly and assembly of the faucet more convenient, with better convenience.
[0028] Another fixing method between the annular cover plate 3 and the housing 1 is provided here. The annular cover plate 3 and the housing 1 can also be fixed by a locking member. For example, the locking member can be a bolt. Specifically, several through holes are provided on the annular cover plate 3, and bolts corresponding to the number of through holes pass through the through holes and are threadedly connected to the housing 1. The locking force of the bolts will cause the housing 1 to deform and thus press the insert 2. However, the material of the housing 1 is PPR, which is relatively soft, and the threads are easily deformed by extrusion, resulting in the loosening of the bolts. Therefore, the fixing effect of using bolts as the locking member is not as good as the interference fit.
[0029] Embodiment 2
[0030] As Figure 2 shown in an embodiment 2 of a PPR equipotential internal-thread elbow with anti-disengagement function. The difference from Embodiment 1 is that the inner wall of the insert 2 further includes a third cylindrical wall 204. The third cylindrical wall 204 is closer to the arc portion 102 axially than the second cylindrical wall 203. The inner diameter of the third cylindrical wall 204 is smaller than that of the second cylindrical wall 203, and the axis of the third cylindrical wall 204 and the axis of the second cylindrical wall 203 are on the same straight line. The third cylindrical wall 204 can play a role in limiting the faucet, avoiding damage to the external thread of the faucet due to excessive screwing of the faucet.
[0031] The remaining features and technical effects of this embodiment are the same as those of Embodiment 1.
[0032] Embodiment 3
[0033] As Figure 1 and Figure 3Example 3 of a PPR equipotential female elbow that prevents disconnection. The difference from Example 1 and Example 2 lies in that it further includes a metal connector 4 and a fixing block 5. An installation groove 205 is provided at one end of the insert 2 close to the annular cover plate 3. One end of the metal connector 4 is fixed in the installation groove 205, and the other end is connected to the fixing block 5. The metal connector 4 is in a long strip shape and extends along the axis of the insert 2 and away from the annular cover plate 3. One end of the fixing block 5 away from the metal connector 4 is flush with the bottom end of the housing 1. A threaded hole 501 is provided on the fixing block 5. A clamping portion 105 is also provided on the outer wall of the housing 1. In this embodiment, the metal connector 4 passes through the clamping groove formed by the clamping portion 105, and there is an interference fit between the clamping portion 105 and the connector. The clamping portion 105 is used to strengthen the fixation between the housing 1 and the metal connector 4. In addition, the fixation methods between the housing 1 and the metal connector 4 can also be welding, riveting, integrally molding, threaded connection, etc.
[0034] Specifically, the metal connector 4 can achieve the equipotential connection of this female elbow, prevent the occurrence of dangerous contact voltage, and has better safety. The long-strip-shaped metal connector 4 has a certain strength and stiffness and can provide support for the housing 1. The fixing block 5 can fix the whole female elbow on an external fixture, with better stability. A bolt can pass through the threaded hole 501 and be fixedly connected to the external fixture, thereby fixing the entire female elbow, with better stability. At the same time, the fixing block 5 can cooperate with the bolt to clamp the grounding wire on the fixing block 5, reducing the occurrence of the grounding wire falling off, with better stability. One end of the fixing block 5 away from the metal connector 4 is flush with the bottom end of the housing 1. When the fixing block 5 is installed on a fixing surface, the bottom end of the housing 1 also contacts the fixing surface. The frictional force between the housing 1 and the fixing surface makes the fixing effect of this female elbow better and the stability better. A clamping portion 105 is also provided on the outer wall of the housing 1. The clamping portion 105 is used to strengthen the fixation between the housing 1 and the metal connector 4, increasing the contact points between the housing 1 and the metal connector 4, making the fixation effect between the metal connector 4 and the housing 1 better and the stability better.
[0035] The remaining features and technical effects of this embodiment are the same as those of Example 1 and Example 2.
[0036] The above embodiments are only preferred embodiments given to fully illustrate the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of the present invention are all within the protection scope of the present invention.
Claims
1. A PPR equipotential female elbow that prevents disconnection, comprising a housing (1) and an insert (2). A cavity inside the housing (1) forms a water flow channel, and the water flow channel includes a water inlet part (101), an arc part (102), and a water outlet part (103) that are connected in sequence. The insert (2) is installed at the water outlet part (103); the outer wall of the insert (2) is completely attached to the inner wall of the housing (1); a fixing part (201) for fixing it to the inner wall of the housing (1) is further provided on the insert (2); the insert (2) is used to connect a faucet, and is characterized in that, It further includes an annular cover plate (3). A first ring plate (301) is provided on the annular cover plate (3). The first ring plate (301) is installed on the housing (1) and is in interference fit with the outer wall of the housing (1). The annular cover plate (3) abuts against one end of the insert (2) away from the arc portion (102).
2. The anti-disconnection PPR equipotential female elbow according to claim 1, characterized in that, An annular groove (104) is provided at one end of the housing (1) close to the annular cover plate (3). A first inclined surface (3011) is provided on the first ring plate (301). A second inclined surface (1041) corresponding to the first inclined surface (3011) is provided in the annular groove (104). The first ring plate (301) is installed in the annular groove (104), and the first inclined surface (3011) and the second inclined surface (1041) are in mutual fit.
3. A PPR equipotential female elbow for preventing disconnection according to claim 1, characterized in that, The annular cover plate (3) further includes a second ring plate (302). The second ring plate (302) is threadedly connected to the inner wall of the insert (2).
4. The anti-disconnection PPR equipotential female elbow according to claim 3, wherein, The inner wall of the insert (2) is distributed in a stepped shape, forming a first cylindrical wall (202) and a second cylindrical wall (203) respectively. The second cylindrical wall (203) is axially closer to the arc portion (102) than the first cylindrical wall (202); the axis of the first cylindrical wall (202) and the axis of the second cylindrical wall (203) are on the same straight line; the inner diameter of the first cylindrical wall (202) is larger than the inner diameter of the second cylindrical wall (203); the inner diameter of the second cylindrical wall (203) is not larger than the inner diameter of the annular cover plate (3); threads are provided on the second cylindrical wall (203).
5. The anti-disconnection PPR equipotential female elbow according to claim 4, characterized in that, The inner wall of the insert (2) further includes a third cylindrical wall (204). The third cylindrical wall (204) is axially closer to the arc portion (102) than the second cylindrical wall (203); the inner diameter of the third cylindrical wall (204) is smaller than the inner diameter of the second cylindrical wall (203); the axis of the third cylindrical wall (204) and the axis of the second cylindrical wall (203) are on the same straight line.
6. The anti-disconnection PPR equipotential female elbow according to claim 4, characterized in that, The fixing portion (201) includes a plurality of convex rings (2011) and a plurality of convex blocks (2012). The axis of the convex ring (2011) is on the same straight line as the axis of the first cylindrical wall (202); the plurality of convex blocks (2012) are located at one end of the insert (2) away from the annular cover plate (3) and are evenly distributed in the circumferential direction.
7. A PPR equipotential female elbow that prevents disconnection according to any one of claims 1-6, characterized in that, It further includes a metal connecting piece (4) and a fixing block (5). An installation groove (205) is formed at one end of the insert (2) close to the annular cover plate (3). One end of the metal connecting piece (4) is fixed in the installation groove (205), and the other end is connected to the fixing block (5).
8. A PPR equipotential female elbow for preventing disconnection according to claim 7, characterized in that, The metal connecting member (4) is strip-shaped and extends along the axis of the insert (2) and away from the annular cover plate (3). One end of the fixing block (5) away from the metal connecting member (4) is flush with the bottom end of the housing (1), and a threaded hole (501) is formed in the fixing block (5).
9. The anti-disconnection PPR equipotential female elbow according to claim 8, characterized in that, A clamping portion (105) is further provided on the outer wall of the housing (1), and the clamping portion (105) is used to strengthen the fixation between the housing (1) and the metal connecting member (4).
10. A PPR equipotential female elbow with anti-disconnection according to any one of claims 1-6, characterized in that, The housing (1) and the insert (2) are integrally formed by welding.