Universal pre-filter valve head and filter

Abstract

The universal pre-filter valve head comprises a PPR (polypropylene random) valve seat, at least one connecting end, a universal pre-filter valve head and a universal pre-filter valve head, the connecting end is inserted into one end of the universal joint and is rotationally arranged relative to the universal joint, a plurality of groove holes are formed in the end of the universal joint, and an annular limiting groove is formed in the periphery of the end of the universal joint; the metal connecting piece comprises a metal insert embedded in the periphery of the connecting end and a plug pin inserted into the slotted hole, an annular clamping groove is formed in the periphery of the position, corresponding to the slotted hole, of the metal insert, the plug pin penetrates through the slotted hole and extends into the annular clamping groove, and the plug pin and the annular clamping groove are clamped in a limiting mode in the axial direction of the annular clamping groove; the lantern ring is arranged on the periphery of the universal joint and covers the bolt to limit the bolt to be separated from the slotted hole, and a buckle which is in axial limiting clamping connection with the annular limiting groove is arranged on the inner wall of the lantern ring. The connection strength of the joint of the PPR valve seat and the universal joint is guaranteed, the manufacturing cost is reduced, and the good lead isolation effect is achieved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of filters, in particular to a universal front filter valve head and a filter. BACKGROUND

[0002] The front filter is the first rough filtering equipment for water in a whole house, can filter silt, rust and large particles in tap water, prevents a large amount of sediment impurities in a city and a community water supply pipe network from causing harm to human bodies, and positively protects buried pipes, faucets, water heaters, boilers, central air conditioners, washing machines, dishwashers, coffee machines and other water household appliances (water purifiers, pure water machines, soft water machines) and the like.

[0003] The valve seat of the existing universal front filter is usually a pure metal structure, especially a lead isolation structure valve seat, which needs to be injection molded with plastic inside the pure metal valve seat to isolate heavy metals, and has high manufacturing cost and complex process; and the ordinary plastic valve seat has low thread connection strength and cannot withstand high pressure environment, and will cause tooth explosion to bring loss to users.

[0004] Therefore, in view of the above technical problems, how to provide a valve head with high connection strength, good lead isolation effect and low manufacturing cost is a technical problem to be solved by those skilled in the art. CONTENT OF THE INVENTION

[0005] The application aims to provide a universal front filter valve head and a filter, which sets a metal connecting piece at a connecting end of a PPR valve seat, ensures the connection strength of the PPR valve seat and a universal joint at the connecting position, reduces the manufacturing cost, and has a good lead isolation effect.

[0006] To achieve the above-mentioned purpose, the application provides a universal front filter valve head, which comprises:

[0007] A PPR valve seat comprising at least one connecting end;

[0008] A universal joint, the connecting end is inserted into one end of the universal joint and is arranged to rotate relative to the universal joint, the end of the universal joint is provided with a plurality of slot holes, and the outer periphery of the end of the universal joint is provided with an annular limiting groove;

[0009] A metal connecting piece comprising a metal insert embedded in the outer periphery of the connecting end and a plug inserted into the slot hole, an annular clamping groove is formed in the outer periphery of the metal insert at a position corresponding to the slot hole, the plug penetrates through the slot hole and extends into the annular clamping groove, and the plug and the annular clamping groove are limited and clamped in the axial direction of the annular clamping groove;

[0010] A sleeve ring is arranged on the outer periphery of the universal joint and covers the latch to limit the latch from disengaging from the slot, and an inner wall of the sleeve ring is provided with a buckle for axially limiting and clamping the annular limiting slot.

[0011] Preferably, an inner wall of the universal joint is provided with a plastic lining, the connecting end is inserted into the plastic lining and is in rotatable sealing connection with the plastic lining, and the plastic lining includes a flow passage outer cavity in communication with an outer cavity of the PPR valve seat and a flow passage inner cavity in communication with an inner cavity of the PPR valve seat.

[0012] Preferably, the connecting end includes a filtering end and a pipeline end, and the universal joint is arranged on the filtering end.

[0013] The universal front filter valve head further includes:

[0014] A metal thread sleeve is arranged on the outer periphery of the pipeline end, and a first metal thread is arranged on the outer periphery of the metal thread sleeve.

[0015] A connecting piece is provided with an annular protruding rib.

[0016] A locking nut is provided with an inner thread for screwing with the first metal thread, and an end of the locking nut is axially limited and clamped with the annular protruding rib on a side away from the metal thread sleeve.

[0017] The metal thread sleeve is fixedly arranged on the outer periphery of the pipeline end, or

[0018] The metal thread sleeve is axially limited and clamped with the pipeline end at least in a direction of movement facing the annular protruding rib.

[0019] Preferably, the outer periphery of the pipeline end is provided with an annular clamping groove, a clamping ring is clamped in the annular clamping groove, an outer diameter of the clamping ring is greater than an outer diameter of the pipeline end, the metal thread sleeve is provided with an annular shoulder for axially limiting and clamping the clamping ring, and the annular shoulder is located on a side of the clamping ring away from the annular protruding rib to limit the movement of the metal thread sleeve in the axial direction facing the annular protruding rib.

[0020] Preferably, the outer periphery of the pipeline end is provided with a polygonal outer wall, and the metal thread sleeve is internally provided with a polygonal inner wall for cooperating with the polygonal outer wall to limit the movement of the metal thread sleeve in the circumferential direction relative to the pipeline end.

[0021] Preferably, the connecting piece includes a connecting head inserted into the pipeline end, the outer periphery of the connecting head is provided with an annular groove, a sealing ring is arranged in the annular groove, and the sealing ring is in sealing abutment with the inner wall of the pipeline end.

[0022] Preferably, the outer diameter of the annular rib is greater than the outer diameter of the connecting head, and a sealing gasket is clamped between the annular rib and the pipeline end, and the sealing gasket is sleeved on the outer periphery of the connecting head.

[0023] Preferably, the connecting piece is a PPR hot melt joint, and the number of the pipeline ends is two, and the pipeline ends correspond to the liquid inlet and the liquid outlet of the PPR valve seat respectively.

[0024] A filter, comprising:

[0025] The valve head is the universal front filter valve head described above, comprising a PPR valve seat and a universal joint arranged at the filtering end of the PPR valve seat, and the PPR valve seat rotates 360° relative to the universal joint.

[0026] The filter assembly is arranged at one end of the universal joint away from the PPR valve seat, and comprises a filter bottle threadedly matched with the universal joint and a filter element arranged in the filter bottle.

[0027] Preferably, the blowdown port of the filter bottle is provided with a ball valve, and the ball valve is sealingly connected with the blowdown port through a sealing element.

[0028] With respect to the background art, the metal connecting piece is arranged at the connecting end of the PPR valve seat, the metal insert is arranged at the outer periphery of the connecting end, the latch is matched with the slot hole on the universal joint, and the slot hole can be inserted into the annular clamping groove of the metal insert, so that the PPR valve seat can stably rotate relative to the universal joint. A sleeve ring is arranged at the outer periphery of the universal joint, which can limit the latch from being separated from the slot hole, and ensure the rotating effect of the universal joint and the PPR valve seat. The metal connecting piece ensures that the connection between the PPR valve seat and the universal joint is metal connection, so that it can withstand high connection pressure. Compared with the traditional metal valve head, the PPR valve seat has good lead isolation effect, simpler manufacturing process and lower manufacturing cost. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the present application, and those skilled in the art can obtain other drawings according to the provided drawings without creative labor.

[0030] Figure 1 The front filter valve head structure provided by the embodiment of the present application is shown in the figure.

[0031] Figure 2 The front filter valve head structure provided by the embodiment of the present application is shown in the figure.

[0032] Figure 3 A cross-sectional view of a universal joint provided by an embodiment of the present application;

[0033] Figure 4 A structure diagram of an outer cavity and an inner cavity of a flow channel of a universal joint provided by an embodiment of the present application;

[0034] Figure 5 A cross-sectional view of a collar provided by an embodiment of the present application;

[0035] Figure 6 A structure diagram of a PPR valve seat provided by an embodiment of the present application;

[0036] Figure 7 A structure diagram of an outer structure of a PPR valve seat provided by an embodiment of the present application;

[0037] Figure 8 A cross-sectional view of a connecting piece provided by an embodiment of the present application;

[0038] Figure 9 A cross-sectional view of a metal toothed sleeve provided by an embodiment of the present application;

[0039] Figure 10 A structure diagram of an injection molding connection between a PPR valve seat and a metal toothed sleeve provided by an embodiment of the present application;

[0040] Figure 11 A structure diagram of a filter in a filtering state provided by an embodiment of the present application;

[0041] Figure 12 A structure diagram of a filter in a pollution discharging state provided by an embodiment of the present application.

[0042] In the figure: 1-PPR valve seat; 101-inner cavity; 102-outer cavity; 103-annular clamping groove; 104-polygonal outer wall;

[0043] 2-universal joint; 201-flow channel outer cavity; 202-flow channel inner cavity; 203-slot hole; 204-annular limiting groove;

[0044] 3-metal insert; 301-annular clamping groove;

[0045] 4-peg;

[0046] 5-collar; 501-buckle;

[0047] 6-plastic lining;

[0048] 7-filter assembly; 701-filter bottle; 702-filter core; 703-sealing element; 704-ball valve;

[0049] 8-Metal thread sleeve; 801-First metal thread; 802-Annular shoulder; 803-Polygonal inner wall;

[0050] 9-Clasp;

[0051] 10- Locking nut;

[0052] 11-Connector; 1101-Annular rib; 1102-Connector head; 1103-Annular groove;

[0053] 12-Sealing gasket. Detailed Implementation

[0054] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0055] It should be noted that in this embodiment, the orientation or positional relationship indicated by terms such as "upper," "lower," "front," and "rear" is based on the orientation or positional relationship shown in the accompanying drawings. It is used only for the convenience of describing this application and for simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application. Furthermore, "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0056] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0057] like Figure 1 As shown, in this embodiment, a universal forward filter valve head is provided, including a PPR valve seat 1 (a valve seat made of type 3 polypropylene), a universal joint 2, a metal connector and a collar 5. The PPR valve seat 1 includes at least one connection end, which can be a liquid inlet end, a liquid outlet end, a filter end, or other port through which liquid needs to flow. This port can be used to insert the universal joint 2. The PPR valve seat 1 can rotate relative to the universal joint 2, thereby realizing a universal rotation connection.

[0058] Specifically, the connecting end can be inserted into one end of the universal joint 2, the universal joint 2 is arranged in a 90° bending manner, and the other end of the universal joint 2 can be connected with a household pipeline, a filtering assembly 7, etc.; for example, when the connecting end of the PPR valve seat 1 is a liquid inlet end and a liquid outlet end, the universal joint 2 can be arranged at the liquid inlet end and the liquid outlet end of the PPR valve seat 1, and the PPR valve seat 1 is connected with the household pipeline through the universal joint 2, so that the household pipeline and the PPR valve seat 1 are connected in a universal rotation manner; for another example, when the connecting end of the PPR valve seat 1 is a filtering end, the universal joint 2 is arranged at the filtering end of the PPR valve seat 1, and the PPR valve seat 1 is connected with the filtering assembly 7 through the universal joint 2, so that the filtering assembly 7 and the PPR valve seat 1 are connected in a universal rotation manner.

[0059] It should be noted that the PPR valve seat 1 is usually a T-shaped pipeline structure, two ports of the T-shaped pipeline structure are a liquid inlet end and a liquid outlet end, and the other port is a filtering end, and the filtering assembly 7 on the filtering end is usually arranged vertically to facilitate sewage discharge; the liquid inlet end and the liquid outlet end are usually connected with a household pipeline, and the household pipeline and the PPR valve seat 1 are connected in a universal rotation manner through the universal joint 2, so that the rotation position of the PPR valve seat 1 can be adjusted adaptively, and thus the filtering assembly 7 can be arranged vertically; similarly, the PPR valve seat 1 can also be connected with the filtering assembly 7 in a universal rotation manner through the universal joint 2, so that the rotation position of the PPR valve seat 1 can be adjusted on the basis that the filtering assembly 7 is arranged vertically, to adapt to household pipelines arranged in different manners.

[0060] A plurality of slot holes 203 are arranged at the end of the universal joint 2, please refer to Figure 3 , the plurality of slot holes 203 are distributed in the circumferential direction of the universal joint 2, and an annular limiting groove 204 is further arranged at the outer periphery of the end of the universal joint 2. The metal connecting piece includes a metal insert 3 embedded in the outer periphery of the connecting end and a plug pin 4 inserted into the slot hole 203, please refer to Figure 1 and 6 , the outer periphery of the metal insert 3 at the corresponding position of the slot hole 203 is provided with an annular clamping groove 301, and the plug pin 4 can penetrate through the slot hole 203 and extend into the annular clamping groove 301, so that the plug pin 4 is limited and clamped with the annular clamping groove 301 in the axial direction of the annular clamping groove 301. On this basis, the metal insert 3 can be fixedly connected with the PPR valve seat 1 by injection molding, to ensure the connection strength of the two, and the plug pin 4 can be used to limit the rotation connection of the universal joint 2 and the PPR valve seat 1, to avoid that the universal joint 2 is separated from the PPR valve seat 1 in the axial direction.

[0061] The sleeve ring 5 is sleeved on the outer periphery of the universal joint 2 and can cover the end of the plug pin 4, so as to limit the plug pin 4 from being separated from the slot hole 203, to improve the connection stability of the metal connecting piece. In addition, please refer to Figure 5A clasp 501 is arranged on the inner wall of the sleeve 5 and axially clamped in the annular limiting groove 204, so as to prevent the sleeve 5 from being separated from the universal joint 2. It should be noted that the latch 4 is arranged to slide relative to the metal insert 3, so that during the rotation of the universal joint 2 relative to the PPR valve seat 1, the metal insert 3 is fixed relative to the PPR valve seat 1, and the latch 4 rotates with the universal joint 2, so that the latch 4 needs to be arranged to slide relative to the metal insert 3.

[0062] For the sleeve 5, the sleeve 5 can be fixedly arranged relative to the universal joint 2 through the clasp 501, for example, the clasp 501 is in interference fit with the annular limiting groove 204, which can achieve the fixed connection of the sleeve 5 and the universal structure to a certain extent; or the sleeve 5 can be rotatably arranged relative to the universal joint 2, as long as it will not be separated from the universal joint 2 in the axial direction, which will not be limited here and falls within the protection scope of the present application.

[0063] In combination with the above embodiments, the metal connecting piece is arranged at the connecting end of the PPR valve seat 1, the metal insert 3 is arranged at the outer periphery of the connecting end, the latch 4 is matched with the slot hole 203 on the universal joint 2, and the slot hole 203 can be inserted into the annular clamping groove 301 of the metal insert 3, so that the PPR valve seat 1 can stably rotate relative to the universal joint 2. The sleeve 5 is arranged at the outer periphery of the universal joint 2, which can limit the latch 4 from being separated from the slot hole 203 and ensure the rotation effect of the universal joint 2 and the PPR valve seat 1. The present application ensures that the connection between the PPR valve seat 1 and the universal joint 2 is metal connection, so that it can withstand high connection pressure. Compared with the traditional metal valve head, the PPR valve seat 1 has good lead isolation effect, simpler manufacturing process and lower manufacturing cost.

[0064] Considering that the valve head needs to have a certain lead isolation effect, the PPR valve seat 1 itself has a certain lead isolation effect, and the universal joint 2 can be provided with a plastic lining 6 on the inner wall, so that the universal structure also has a lead isolation effect. Specifically, the connecting end of the PPR valve seat 1 can be inserted into the plastic lining 6, so as to ensure that the liquid flow channel can be in contact with the plastic material throughout, thereby improving the lead isolation effect; and a rotating sealing device is additionally arranged at the connection between the connecting end and the plastic lining 6, so as to ensure the sealing connection between the flow channel in the PPR valve seat 1 and the flow channel in the universal joint 2.

[0065] It is pointed out above that the connecting end can be a liquid inlet end, a liquid outlet end or a filtering end. In some embodiments, the connecting end is specifically a filtering end, that is, the universal joint 2 is arranged at the filtering end, and the liquid outlet end and the liquid inlet end are pipe ends for external connection of household pipes.

[0066] On this basis, please refer to Figure 1 and Figure 4The plastic inner liner 6 comprises a flow channel outer cavity 201 communicating with the outer cavity 102 of the PPR valve seat 1 and a flow channel inner cavity 202 communicating with the inner cavity 101 of the PPR valve seat 1. Raw water can enter the flow channel outer cavity 201 through the outer cavity 102, flow to the inner cavity 101 through the flow channel inner cavity 202 after passing through the filter assembly 7 at the filtering end, and be discharged through the outlet of the PPR valve seat 1.

[0067] In some embodiments, please refer to Figure 2 The valve head further comprises a metal thread sleeve 8, a connecting piece 11 and a locking nut 10. The metal thread sleeve 8 is sleeved on the outer periphery of the pipeline end, and the outer periphery of the metal thread sleeve 8 is provided with a first metal thread 801. When the pipeline end is a liquid inlet end and a liquid outlet end, the corresponding connecting piece 11 should be an adapter in the liquid supply pipeline (household water pipe, etc.). In addition, the pipeline end includes but is not limited to the above-mentioned liquid inlet end and liquid outlet end, and can also be a port for connecting other components such as a pressure gauge, and the corresponding connecting piece 11 should be a component such as a pressure gauge.

[0068] An annular protrusion 1101 is arranged on the connecting piece 11, and the locking nut 10 is provided with an inner thread for screwing with the first metal thread 801, and the end of the locking nut 10 is axially limited and clamped away from the side of the metal thread sleeve 8 facing the annular protrusion 1101.

[0069] It should be pointed out that the metal thread sleeve 8 can be fixed on the outer periphery of the pipeline end, and the first metal thread 801 can be exposed relative to the pipeline end, so as to ensure that the locking nut 10 is screwed with the first metal thread; or the metal thread sleeve 8 is axially limited and clamped with the pipeline end at least in the direction of movement facing the annular protrusion 1101. On this basis, the metal thread sleeve 8 can be fixedly connected with the pipeline end by injection molding, as shown in Figure 10 Of course, the fixed connection mode includes but is not limited to injection molding; the metal thread sleeve 8 can also be axially clamped and connected as shown in Figure 2 .

[0070] However, no matter which connection mode is used, when the locking nut 10 is rotated and screwed onto the metal thread sleeve 8, the locking nut 10 will drive the connecting piece 11 to move towards the metal thread sleeve 8 by being axially limited and clamped with the annular protrusion 1101, and under the premise that the metal thread sleeve 8 is fixed or axially clamped with the pipeline end, the connecting piece 11 will gradually abut against the pipeline end, thereby realizing stable connection between the two.

[0071] By arranging the metal thread sleeve 8 on the outer periphery of the pipeline end of the PPR valve seat 1, the metal thread sleeve 8 can be fixedly connected with the pipeline end, for example, injection molding, or the metal thread sleeve 8 is axially limited and clamped with the pipeline end, thereby ensuring that the metal thread sleeve 8 can provide stable connection support effect. An annular protrusion 1101 is arranged on the connecting piece 11, please refer to Figure 8The connecting piece 11 can be an adapter connected with the household pipeline, etc., and the end of the locking nut 10 is axially limited and clamped on the side of the annular convex rib 1101 away from the metal thread sleeve 8, so that the connecting piece 11 can be moved to face the pipeline end by rotating the locking nut 10, thereby realizing stable connection. The metal thread sleeve 8 and the PPR valve seat 1 are connected by injection molding or clamping, etc., so that the connection of the valve head is all metal thread, which can withstand high connection pressure. Compared with the traditional metal valve head, the PPR valve seat 1 has good lead isolation effect, simpler manufacturing process and lower manufacturing cost.

[0072] Please refer to Figure 6 An annular clamping groove 103 is arranged on the outer periphery of the pipeline end, and a clamping ring 9 is clamped in the annular clamping groove 103. The outer diameter of the clamping ring 9 is greater than the outer diameter of the pipeline end, and the metal thread sleeve 8 is provided with an annular shoulder 802 axially limited and clamped with the clamping ring 9. Please refer to Figure 9 The annular shoulder 802 is located on the side of the clamping ring 9 away from the annular convex rib 1101, so as to limit the movement of the metal thread sleeve 8 in the axial direction facing the annular convex rib 1101.

[0073] For the mode of fixed connection of the metal thread sleeve 8 and the pipeline end, the metal thread sleeve 8 is fixed relative to the pipeline end in the axial, radial and circumferential directions. When the metal thread sleeve 8 is axially clamped with the pipeline end, the radial and circumferential positions of the metal thread sleeve 8 need to be limited by the pipeline end, so as to avoid the instability of the metal thread sleeve 8 during the rotation of the locking nut 10. Therefore, the present application can also be provided with a polygonal outer wall 104 on the outer periphery of the pipeline end. Please refer to Figure 7 Correspondingly, a polygonal inner wall 803 is arranged inside the metal thread sleeve 8 and matched with the polygonal outer wall 104. Please refer to Figure 9 Through the cooperation of the polygonal outer wall 104 and the polygonal inner wall 803, the movement of the metal thread sleeve 8 in the circumferential direction can be limited, so as to keep the metal thread sleeve 8 and the pipeline end relatively fixed in the circumferential direction. In the radial direction, the inner diameter of the metal thread sleeve 8 is matched with the outer diameter of the pipeline end, so as to keep the relative fixation of the two in the radial direction.

[0074] For the pipeline end with liquid flowing through, the connecting piece 11 also includes a connecting head 1102 extending into the pipeline end. Please refer to Figure 8 The outer periphery of the connecting head 1102 is provided with an annular groove 1103, and a sealing ring is arranged in the annular groove 1103. The sealing ring is sealingly abutted with the inner wall of the pipeline end, so as to keep the sealing property of the connecting piece 11 and the pipeline end, and avoid the leakage of liquid from the connection between the two.

[0075] In addition, please refer to Figure 8The outer diameter of the annular protrusion 1101 is greater than the outer diameter of the connecting head 1102, and the sealing gasket 12 is clamped between the annular protrusion 1101 and the pipeline end. The sealing gasket 12 is pressed by the annular protrusion 1101 and the pipeline end on both sides, so as to cooperate with the sealing ring to realize the double-sealing structure of the connection, thereby achieving the maximum safety guarantee.

[0076] When the pipeline end is a liquid inlet end, a liquid outlet end or the like, the connecting piece 11 can be a PPR hot melt joint. The household pipeline can be connected with the PPR hot melt joint by hot melting, and the disassembly and maintenance are very convenient. The number of the pipeline end is at least two, and corresponds to the liquid inlet and liquid outlet of the PPR valve seat 1.

[0077] The application also provides a filter. Please refer to Figure 1 The filter includes a valve head and a filter assembly 7. The valve head is the universal front filter valve head described above, which includes the PPR valve seat 1 and the universal joint 2 rotatably arranged at the filtering end of the PPR valve seat 1. The filter assembly 7 is arranged at one end of the universal joint 2 away from the PPR valve seat 1. The filter assembly 7 includes a filter bottle 701 threadedly matched with the universal joint 2 and a filter core 702 arranged inside the filter bottle 701. When raw water flows through the filter core 702, impurities in the liquid can be filtered.

[0078] It is pointed out above that the filter assembly 7 can be connected with the universal joint 2 by adopting the metal thread sleeve 8 and the locking nut 10. Of course, other ways can also be adopted to connect, such as connecting with the universal joint 2 by a metal thread insert. Specifically, the filter assembly 7 includes the filter bottle 701. The inner wall of the universal joint 2 is embedded with a metal thread insert. The inner wall of the metal thread insert is provided with a second metal thread. The end of the filter bottle 701 is inserted into the universal joint 2, and a third metal thread matched with the second metal thread is arranged on the outer periphery of the inserted end, so as to realize the fixed connection of the filter assembly 7 and the universal joint 2 by thread cooperation. Of course, for the connecting piece 11 described above, the metal thread insert can also be adopted to realize the connection with the PPR valve seat 1. Here, it will not be described one by one, and all fall within the protection scope of the application.

[0079] A ball valve 704 is arranged at the blowdown port of the filter bottle 701, and the ball valve 704 is sealingly connected with the blowdown port through a sealing element 703. Figure 11 and Figure 12 When filtering is needed, the ball valve 704 is closed, the liquid enters the filter core 702 from the outer cavity 102 and the flow passage outer cavity 201, and is discharged from the flow passage inner cavity 202 and the inner cavity 101 after passing through the filter core 702, so as to realize the liquid filtering.

[0080] In addition, the filter further comprises a pressure gauge (not shown in the figure) arranged on the PPR valve seat 1, the pressure gauge being used to monitor the fluid pressure in the PPR valve seat 1, the pressure gauge being connected with the PPR valve seat 1 through a metal thread insert, the metal thread insert being injection-molded with the PPR valve seat 1, and a metal thread being arranged on the metal thread insert so as to realize the threaded connection with the pressure gauge.

[0081] It should be noted that the relative terms, such as first and second, in the present description are only used to distinguish one entity from another entity, and do not necessarily require or imply any such actual relationship or order between the entities.

[0082] The principles and implementation manners of the present application are described herein by using specific examples, and the above description of the examples is only used to help understand the method of the present application and its core idea. It should be noted that, for those skilled in the art, some improvements and modifications can be made to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A universal pre-positioned filter valve head, characterized in that, include: PPR valve seat (1) includes at least one connection end; Universal joint (2), the connecting end is inserted into one end of the universal joint (2) and rotated relative to the universal joint (2), the end of the universal joint (2) is provided with a plurality of slots (203), and the outer periphery of the end of the universal joint (2) is provided with an annular limiting groove (204). The metal connector includes a metal insert (3) embedded in the outer periphery of the connecting end and a pin (4) inserted into the slot (203). The outer periphery of the metal insert (3) at the position corresponding to the slot (203) is provided with an annular snap-fit ​​groove (301). The pin (4) passes through the slot (203) and extends into the annular snap-fit ​​groove (301). In the axial direction of the annular snap-fit ​​groove (301), the pin (4) is limited and snapped with the annular snap-fit ​​groove (301). A collar (5) is provided on the outer periphery of the universal joint (2) and covers the pin (4) to restrict the pin (4) from disengaging from the slot (203). The inner wall of the collar (5) is provided with a buckle (501) that is axially limited and engaged with the annular limiting groove (204).

2. The universal pre-filter valve head according to claim 1, characterized in that, The universal joint (2) has a plastic liner (6) on its inner wall. The connecting end extends into the plastic liner (6) and is rotatably and sealed with it. The plastic liner (6) includes an outer cavity (201) that communicates with the outer cavity (102) of the PPR valve seat (1) and an inner cavity (202) that communicates with the inner cavity (101) of the PPR valve seat (1).

3. The universal pre-filter valve head according to claim 1, characterized in that, The connection end includes a filter end and a pipeline end, and the universal joint (2) is located at the filter end; The universal pre-filter valve head also includes: A metal threaded sleeve (8) is provided on the outer periphery of the pipeline end, and the outer periphery of the metal threaded sleeve (8) is provided with a first metal thread (801). Connector (11), wherein the connector (11) is provided with annular rib (1101). The locking nut (10) is provided with an internal thread that mates with the first metal thread (801) thread. The end of the locking nut (10) is axially limited and engaged with the annular rib (1101) on the side away from the metal thread sleeve (8). The metal threaded sleeve (8) is fixedly disposed on the outer periphery of the pipe end, or, The metal threaded sleeve (8) is axially locked and engaged with the pipeline end at least in the direction of movement facing the annular rib (1101).

4. The universal pre-filter valve head according to claim 3, characterized in that, The outer periphery of the pipeline end is provided with an annular groove (103), and a retaining ring (9) is engaged in the annular groove (103). The outer diameter of the retaining ring (9) is larger than the outer diameter of the pipeline end. The metal threaded sleeve (8) is provided with an annular shoulder (802) that is axially limited and engaged with the retaining ring (9). The annular shoulder (802) is located on the side of the retaining ring (9) away from the annular rib (1101) to restrict the metal threaded sleeve (8) from moving axially toward the annular rib (1101).

5. The universal forward-facing filter valve head according to claim 3, characterized in that, The outer periphery of the pipeline end is provided with a polygonal outer wall (104), and the inside of the metal threaded sleeve (8) is provided with a polygonal inner wall (803) that cooperates with the polygonal outer wall (104) to restrict the movement of the metal threaded sleeve (8) relative to the pipeline end in the circumferential direction.

6. The universal pre-filter valve head according to claim 3, characterized in that, The connector (11) includes a connector (1102) that extends into the pipe end. The connector (1102) has an annular groove (1103) on its outer periphery. A sealing ring is provided in the annular groove (1103), and the sealing ring seals against the inner wall of the pipe end.

7. The universal forward-facing filter valve head according to claim 6, characterized in that, The outer diameter of the annular rib (1101) is larger than the outer diameter of the connector (1102). A sealing gasket (12) is held between the annular rib (1101) and the pipeline end. The sealing gasket (12) is sleeved on the outer periphery of the connector (1102).

8. The universal forward-mounted filter valve head according to any one of claims 3-7, characterized in that, The connector (11) is a PPR heat fusion joint, and there are two pipe ends, which correspond to the inlet and outlet of the PPR valve seat (1) respectively.

9. A filter, characterized in that, include: The valve head is the universal forward filter valve head according to any one of claims 1-8, comprising a PPR valve seat (1) and a universal joint (2) disposed at the filter end of the PPR valve seat (1), wherein the PPR valve seat (1) rotates 360° relative to the universal joint (2). The filter assembly (7) is located at the end of the universal joint (2) away from the PPR valve seat (1), and includes a filter bottle (701) that is threadedly engaged with the universal joint (2) and a filter element (702) located inside the filter bottle (701).

10. The filter according to claim 9, characterized in that, The drain port of the filter bottle (701) is equipped with a ball valve (704), and the ball valve (704) is sealed to the drain port through a sealing element (703).

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