Secondary injection molding irrigation valve with built-in sealing ring

Abstract

The utility model discloses a secondary injection molding irrigation valve with a built-in sealing ring, which relates to a compression molding irrigation valve and comprises a secondary injection molding shell on the outer layer and a primary injection molding valve body on the inner layer. The valve body formed through one-time injection molding comprises a first valve body half shell, a second valve body half shell and a valve element body, a sealing ring is arranged on a valve rod of the valve element body, and when the valve element body is rotatably arranged in a valve seat cavity locked by the first valve body half shell and the second valve body half shell, the sealing ring can cover the outer side of a matching gap between the valve rod and a through hole; the shell formed by secondary injection molding is located outside the valve body formed by primary injection molding, and the sealing ring is arranged between the shell formed by secondary injection molding and the valve body formed by primary injection molding so as to seal a matching gap; compared with a traditional structure, the built-in structure of the sealing ring has the advantages that the performance of the sealing ring is not influenced by water pressure and looseness of the grip, and the extrusion force is not changed along with time, so that the sealing performance of the irrigation valve is improved, and the use cost of the irrigation valve is reduced.

Description

Technical Field

[0001] The utility model relates to a compression-molded irrigation valve, in particular to a secondary injection-molded irrigation valve with a built-in sealing ring. Background Art

[0002] Agricultural irrigation valves play an important role in agricultural irrigation systems, controlling the on / off, flow and pressure of fluids. They can be operated manually or automatically as needed, provide reliable fluid control, and are durable and corrosion-resistant.

[0003] At present, manual irrigation valves formed by mold compression molding are usually formed by double injection molding. In order to avoid the leakage of farmland irrigation water in the matching gap between the valve stem and the valve seat cavity, a sealing ring is usually installed on the valve stem after the secondary injection molding (secondary injection molding mold molding), and the sealing ring is squeezed by a handle connected to the valve stem to seal the matching gap between the valve stem and the valve seat cavity. However, in actual use, due to factors such as water pressure shock and loose handle, it is easier to cause the sealing ring to loosen, thereby causing the irrigation valve to leak farmland irrigation water.

[0004] Based on the above analysis, the utility model designs and develops a sealing ring built-in secondary injection molding irrigation valve. Utility Model Content

[0005] The utility model aims to provide a secondary injection molding irrigation valve with an internal sealing ring, so as to solve the problem that the sealing ring is easy to loosen and thus the sealing performance of the valve body is poor.

[0006] In order to solve the above problems, the utility model provides a sealing ring built-in secondary injection molded irrigation valve, comprising an outer layer of a secondary injection molded shell and an inner layer of a single injection molded valve body; the single injection molded valve body comprises a first valve body half shell, a second valve body half shell and a valve core body, the first valve body half shell and the second valve body half shell can be locked to form a valve seat cavity with a through hole; the valve core body is provided with a valve stem, and the valve stem is provided with a sealing ring arranged along its circumference and extending along its radial direction, when the valve core body is rotatably arranged in the valve seat cavity, the valve stem thereon extends to the outside of the valve seat cavity through the through hole on the valve seat cavity and the sealing ring on the valve stem covers the outside of the fitting gap between the valve stem and the through hole; the secondary injection molded shell is located outside the single injection molded valve body and limits the sealing ring between the secondary injection molded shell and the single injection molded valve body to seal the fitting gap.

[0007] As a preferred solution of the present application, semicircular clamping holes are respectively provided at the uppermost parts of the side walls at corresponding positions of the first valve body half shell and the second valve body half shell, and the clamping holes on the two valve body half shells are connected to form a through hole. At the same time, an annular groove that can be connected with the clamping hole is provided on the valve stem below the sealing ring, and the valve core body is rotatably arranged in the valve seat cavity through the cooperation of the clamping hole and the annular groove.

[0008] As a preferred solution of the present application, a support seat is further provided on the end of the valve core body opposite to the valve stem. At the same time, a clamping seat is provided on the inner side of the side wall at the corresponding position of the first valve body half shell and the second valve body half shell, and the support seat can be nested in the clamping seat and rotatably cooperate with it.

[0009] As a preferred solution of the present application, the sealing ring is provided with one or more, and when there are multiple sealing rings, the multiple sealing rings are stacked along the axis of the valve stem.

[0010] As a preferred solution of the present application, a receiving groove is provided on the valve stem, and the sealing ring is nested in the receiving groove and is fixedly and statically sealed with the receiving groove.

[0011] As a preferred solution of the present application, the uppermost part of the secondary injection-molded shell body is close to and simultaneously surrounds the sealing ring and the annular part of the valve stem, and is cooled and formed to be fixed into a first circular axial hole surrounding the sealing ring; the inner circumferential surface of the first circular axial hole is limited by the space of the sealing ring to form a second annular groove accordingly; the second annular groove and the above-mentioned accommodating groove cooperate with each other to form an annular sealing chamber, and then the sealing ring is limited and embedded in the annular sealing chamber; the sealing ring is tightly fitted with the matching gap between the valve stem and the through hole; the valve body is provided with a first annular protrusion, and on the valve A first annular groove is provided on the rod below the sealing ring, and the through hole is surrounded by a first annular protrusion. The through hole at the uppermost part of the valve body formed by the first injection molding is provided with a first annular protrusion, and the first annular protrusion is rotatably installed in the first annular groove. The rotatable limiting installation of the first annular protrusion and the first annular groove correspondingly limits the valve core body to the valve body formed by the first injection molding, and the valve stem also correspondingly rotates in a self-rotating manner to press and fit with the second circular axial hole that is close to the uppermost part of the shell formed by the second injection molding and surrounds the valve stem.

[0012] As a preferred solution of the present application, the sealing ring covers the annular fitting gap between the valve stem and the through hole in a contact manner or a non-contact manner.

[0013] As a preferred embodiment of the present application, the sealing ring covers the fitting gap in a contact manner, and the sealing ring is arranged above the fitting gap at a certain interval. The upper end of the valve stem is located between the first annular protrusion and the sealing ring located above it, and a third annular protrusion and a fourth annular protrusion are correspondingly retained. The third annular protrusion is a part of the valve stem body and is located between the first annular protrusion and the sealing ring, and the fourth annular protrusion is a part of the shell body molded by secondary injection molding and is located between the first annular protrusion and the sealing ring. The sealing ring and the second annular groove are statically frictionally sealed and dynamically sealed with the accommodating groove.

[0014] As a preferred embodiment of the present application, the sealing ring covers the annular fitting gap in a non-contact manner, and the sealing ring directly contacts the top surface of the valve body that is injection molded once. The sealing ring and the second annular groove are statically frictionally sealed and cooperate with the accommodating groove in a dynamic frictionally sealed manner, and also cooperate with the statically frictionally sealed top surface of the valve body that is injection molded once.

[0015] Compared with the prior art, the technical advantages of the utility model - the sealing ring built-in secondary injection molding irrigation valve are:

[0016] The sealing ring built-in secondary injection molding irrigation valve abandons the existing traditional sealing ring external structure, sets the sealing ring on the valve stem of the valve body formed by primary injection molding (formed by primary injection molding mold), and squeezes and limits the sealing ring between the secondary injection molding shell and the primary injection molding valve body through the secondary injection molding (formed by secondary injection molding mold) shell, thereby forming a sealing ring built-in structure. Compared with the traditional structure, the sealing ring is located inside the irrigation valve. In actual use, the sealing performance of the sealing ring is not affected by the agricultural irrigation water flowing through the valve seat cavity. The pressure and loosening of the handle (screws and other threaded fasteners) fixed to the outer end of the valve stem, and the extrusion force will not change significantly with time. The built-in structure of the valve body for limiting the installation of the sealing ring (the second annular groove and the accommodating groove cooperate with each other to form an annular sealing chamber) can effectively prevent the water pressure from pushing the sealing ring out of the valve body (the shell formed by secondary injection molding), and always firmly fixes the limiting sealing ring in the valve body by squeezing the limiting sealing ring. This not only improves the sealing performance of the irrigation valve, but also reduces the use cost of the irrigation valve, and has good market, promotion and use value.

[0017] Furthermore, when the valve stem and the valve body formed by the first injection molding are covered by the shell formed by the second injection molding, not only the sealing ring is also embedded in the annular sealing chamber in an extruded state by the pressure of the second injection molding, but also the shell formed by the second injection molding is correspondingly tightly covered by the outer peripheral wall of the upper end of the valve stem outside the valve body and the valve body formed by the first injection molding by the pressure of the second injection molding. The first circular shaft hole is tightly pressed against the sealing ring in the radial direction, and the second circular shaft hole is tightly fitted on the valve stem (pressing the valve stem in the radial direction). Finally, after the utility model (shell formed by the second injection molding) is cooled and fixed, the static friction between the first circular shaft hole and the sealing ring and the static friction between the second circular shaft hole and the outer peripheral wall of the end of the valve stem are increased accordingly. When the existing valve core body used in the agricultural irrigation valve mentioned in the above-mentioned background technology is spherical, the handle fixed to the outer end of the valve stem is rotated by hand to drive the valve core body to rotate a certain angle in the valve seat cavity. After (adjusting the opening of the valve seat cavity so that the valve core body opens or closes the valve seat cavity), if the impact force of the water flow of the farmland irrigation water flowing through the valve seat cavity is very large, the valve core body will be easily driven by the impact force of the water flow to rotate, and then the previous opening of the valve core body will change (affecting the stability of the opening of the existing irrigation valve), and the valve core body will rotate by the impact force of the water flow until the opening is often reduced to zero (the valve core body completely closes and cuts off the valve seat cavity), resulting in the water flow rate per unit time flowing through the irrigation valve also being reduced to zero, preventing the irrigation water from flowing to the downstream pipeline or farmland, and even suffocating or damaging the upstream water pump; when the existing valve core body main body of the irrigation valve of the utility model is spherical, when the impact force of the water flow of the farmland irrigation water flowing through the valve seat cavity is very large (relatively large) but not too large, the increase in this static friction force can further increase the fixed friction torque of the second circular shaft hole and the first circular shaft hole (sealing ring) on ​​the valve stem, and the valve core body is less likely to be rotated by the impact of the water flow, The valve core body has improved its ability to resist impact and self-rotate when the opening (rotation angle) remains unchanged. Moreover, because the second circular shaft hole and the valve stem are pressed against each other, the mutual tight surface fit between the second circular shaft hole and the valve stem can prevent a large number of floating dust particles from falling through the gap between the second circular shaft hole and the valve stem into the annular sealing chamber formed by the second annular groove and the accommodating groove, thereby preventing a large number of floating dust particles from accumulating in the annular sealing chamber and accelerating the wear of the sealing ring when the valve stem rotates relative to the sealing ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the main structure of the sealing ring built-in secondary injection molding irrigation valve provided by the utility model.

[0019] Figure 2a This is a schematic diagram of the first exploded structure of a valve body formed by one-step injection molding provided by the utility model.

[0020] Figure 2bThis is a schematic diagram of a second exploded structure of a valve body formed by one-step injection molding provided by the utility model.

[0021] Figure 2c This is a schematic diagram of the third exploded structure of the one-step injection-molded valve body provided by the utility model.

[0022] Figure 3 This is a partial enlarged schematic diagram of point A in Figure 2 provided by the utility model.

[0023] Figure 4 This is a schematic diagram of the installation of the valve core body provided by the utility model on the first valve body half shell.

[0024] Figure 5 The utility model provides Figure 4 A local enlarged schematic diagram of point B in the middle.

[0025] Figure 6 This is a schematic cross-sectional structural diagram of a secondary injection-molded irrigation valve provided by the utility model.

[0026] Figure 7 The utility model provides Figure 6 A local enlarged schematic diagram of point C in the middle.

[0027] Figure 8 The utility model provides Figure 6 Another partial enlarged schematic diagram of point C in the middle.

[0028] Reference numerals

[0029] Shell 1, valve body 2, first valve body half shell 21, second valve body half shell 22, valve core body 23, valve stem 231, sealing ring 2311, first annular groove 2312, first annular protrusion 2313, second circular shaft hole 2314, first circular shaft hole 2315, second annular groove 2316, second annular protrusion 2317, third annular protrusion 2318, fourth annular protrusion 2319, supporting seat 232, clamping hole 24, clamping seat 25, pin hole 26, pin 27, sealing gasket 28. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below in conjunction with specific implementations and with reference to the accompanying drawings. It should be emphasized that the following description is merely exemplary and is not intended to limit the scope of the present invention and its application.

[0031] like Figure 1 , Figure 6-Figure 8As shown, it is a schematic diagram of the main structure of a secondary injection molded irrigation valve with an internal sealing ring provided in this embodiment; the irrigation valve comprises an outer secondary injection molded shell 1 and an inner single injection molded valve body 2. It can be understood that in order to improve the sealing performance, the material selected for the secondary injection molded shell 1 and the single injection molded valve body 2 should be the same, so as to facilitate the fusion of the two injection molding processes, so that the secondary injection molded shell 1 is in a high-temperature liquefied molding state in the mold and is fixed to the inner single injection molded valve body 2 by heat fusion.

[0032] The valve body 2 formed by one-time injection molding is cooled and fixed by a secondary injection mold. The valve body 2 generally includes a first valve body half shell 21, a second valve body half shell 22 and a valve core body 23. As shown in FIG. 2 , the first valve body half shell 21 and the second valve body half shell 22 can be locked by pinning, screwing, heat sealing or snapping to form a valve seat cavity with a through hole. The first annular protrusion 2313 provided on the combined splicing body of the first valve body half shell 21 and the second valve body half shell 22 forms the above-mentioned through hole. It can be understood that the first valve body half shell 21 and the second valve body half shell 22 should be respectively provided with a liquid inlet end and a liquid outlet end. In the embodiment, the diameter of the liquid inlet end is preferably larger than the diameter of the liquid outlet end. At the same time, a sealing gasket 28 corresponding to the liquid outlet end is provided on the inner wall of the first valve body half shell 21, so as to cooperate with the valve core body 23 to seal each other and effectively intercept / cut off the valve seat cavity of the utility model; a valve stem 231 is provided on the valve core body 23, and a sealing ring 2311 is provided on the valve stem 231 along its circumferential direction and extending along the radial direction of the valve stem 231 (the width direction / radial direction of the sealing ring 2311), that is, a sealing ring 2311 of a certain radial width is sleeved on the valve stem 231, and the sealing ring 2311 is made of an existing elastic material, such as Figure 3As shown, in order to improve the stability / firmness of the sealing ring 2311 installed on the valve stem 231 and prevent the sealing ring 2311 from coming off or shifting from the valve stem 231, a receiving groove for limiting the installation of the sealing ring 2311 can be provided on the valve stem 231, and the sealing ring 2311 is embedded in the receiving groove and cooperates with the receiving groove in a fixed static friction seal or a rotating dynamic seal (the former measure), or the sealing ring 2311 is fixed to the valve stem 231 by means of hot pressing or bonding (the latter measure). The former measure is preferably adopted in this embodiment, which is conducive to reducing or avoiding excessive wear (friction loss) / damage to the sealing ring 2311 when the valve stem 231 rotates;When the valve core body 23 is rotatably arranged in the valve seat cavity, the valve stem 231 thereon extends through the through hole on the valve seat cavity to the outside of the valve seat cavity and the sealing ring 2311 on the valve stem 231 covers the outside of the matching gap / matching gap between the valve stem 231 and the through hole, and the matching gap / matching gap is correspondingly annular, that is, the sealing ring 2311 is also located outside the valve seat cavity, and the radial width of the sealing ring 2311 extending along the radial direction of the valve stem 231 can cover the matching gap between the valve stem 231 and the through hole. It can be understood that after the valve core body 23 is installed in the valve seat cavity, the sealing ring 2311 can be in a contact manner (contacting the valve body 2 molded by one injection) or a non-contact manner (not contacting the top surface of the valve body 2 molded by one injection (the first annular convex The first circular convex portion 2313 / the edge of the first circular shaft hole 2315) covers the above-mentioned annular fitting gap / fitting gap. When the utility model is implemented, it is preferred to cover the above-mentioned annular fitting gap / fitting gap in a non-contact manner. The non-contact covering should be understood as the sealing ring 2311 is arranged above the above-mentioned fitting gap at a certain distance (the height distance between the sealing ring 2311 and the first circular convex portion 2313). The sealing ring 2311 is located at a position of 2-5mm just above the fitting gap. The height of this position is conducive to the sealing ring 2311 being in close contact with the above-mentioned fitting gap under the extrusion of the secondary injection molded shell 1. Therefore, the upper end of the valve stem 231 is located at the first annular convex portion 2313 (the top surface of the valve body 2 molded by the primary injection molding). ) and the sealing ring 2311 located above it, a third annular protrusion 2318 and a fourth annular protrusion 2319 are correspondingly reserved. The third annular protrusion 2318 is a part of the valve stem 231 body and is located between the first annular protrusion 2313 and the sealing ring 2311. The fourth annular protrusion 2319 is a part of the housing 1 body that is molded by secondary injection molding and is located between the first annular protrusion 2313 and the sealing ring 2311. The sealing ring 2311 and the second annular groove 2316 (the valve body 2 that is molded by primary injection molding) are statically frictionally pressed and sealed, and are dynamically frictionally pressed and sealed with the accommodating groove (valve stem 231) (the valve stem 231 (accommodating groove) is dynamically frictionally pressed and sealed with the sealing ring 2311 in a self-rotating manner). The third annular protrusion 2318 is matched with the fourth annular protrusion 2319 in a rotating manner in dynamic friction and pressure contact); if the utility model is implemented in a contact manner to cover the above-mentioned annular matching gap / matching gap, the sealing ring 2311 directly contacts the top surface of the valve body 2 formed by one-time injection molding, and the height distance between the sealing ring 2311 and the first annular protrusion 2313 is zero. At this time, there is no third annular protrusion 2318 and fourth annular protrusion 2319 between the first annular protrusion 2313 and the sealing ring 2311, and the sealing ring still cooperates with the second annular groove 2316 described below in static friction and pressure contact sealing, and cooperates with the accommodating groove in dynamic friction and pressure contact sealing, and also cooperates with the top surface of the valve body 2 formed by one-time injection molding in static friction and pressure contact sealing. ;

[0033] The secondary injection molded shell 1 is located outside the primary injection molded valve body 2 and limits the sealing ring 2311 between the secondary injection molded shell 1 and the primary injection molded valve body 2 to put the fitting gap / gap in place and effectively seal. In the existing known technical field, the sealing performance of the sealing ring 2311 is related to the tightness of its contact with the above-mentioned fitting gap. Therefore, it can be understood that in the secondary injection mold molding process of the utility model, the annular part of the uppermost part of the secondary injection molded shell 1 close to and simultaneously surrounding the sealing ring 2311 and the valve stem 231 is limited by the space of the secondary injection molding mold, the sealing ring 2311 and the valve stem 231, and naturally covers the sealing ring 231 in a high-temperature molten state before cooling and fixing the molding. Since the secondary injection molded shell 1 and the sealing ring 2311 are made of different materials, the secondary injection molded shell 1 will not be thermally melted / bonded to each other with the sealing ring 2311 after the final cooling and fixing molding. The annular portion is cooled and formed into a first circular axial hole 2315 surrounding the sealing ring 2311, and the inner circumference of the first circular axial hole 2315 is limited by the space of the sealing ring 2311 to form a second annular groove 2316 accordingly. The second annular groove 2316 and the above-mentioned accommodating groove cooperate with each other to form an annular sealing chamber, and then the sealing ring 2311 is limited and embedded in the annular sealing chamber; in addition, when the secondary injection molded housing 1 is in a hot-melt liquid state in the secondary injection molding mold, the secondary injection molding pressure it is subjected to is relatively large and can act on the sealing ring 2311, driving the sealing ring 2311 to be subjected to the above-mentioned secondary injection molding pressure. The second annular groove 2316 and the accommodating groove are squeezed into place by the injection molding pressure, so that elastic deformation occurs, and then the second annular groove 2316 and the matching gap between the valve stem 231 and the above-mentioned through hole are fully filled and filled, and the area of ​​the second annular groove 2316 and the accommodating groove in seamless contact with the sealing ring 2311 is maximized. When the secondary injection-molded housing 1 is cooled and solidified, the sealing ring 2311 can be squeezed to deform it, and the deformed sealing ring 2311 can fit tightly with the matching gap between the valve stem 231 and the through hole, thereby enhancing the technical effect of the sealing ring 2311 effectively sealing the above-mentioned annular matching gap. Figure 6-7 shown.

[0034] In this embodiment, the valve core body 23 is preferably a semicircular convex shell structure, that is, the valve core body 23 is spherical. In practical applications, the existing traditional spherical convex shell structure can also be selected.

[0035] In this embodiment, as shown in FIG. 2 ( Figure 2a , Figure 2b , Figure 2c )、 Figure 3-Figure 5 As shown in Figure 2, Figure 3-Figure 5The secondary injection molded irrigation valve or its decomposed structure is in an inverted state), the uppermost parts of the side walls at the corresponding positions of the first valve body half shell 21 and the second valve body half shell 22 are respectively provided with semicircular clamping holes 24, and the clamping holes 24 on the two valve body half shells are connected to form a through hole, and the through hole is surrounded by the first annular protrusion 2313 described below, and the first annular protrusion 2313 described below is matched and sleeved in the first annular groove 2312 described below. Specifically, a first annular groove 2312 is provided on the valve stem 231 of the valve core body 23 below the sealing ring 2311, and the valve core body 23 is rotatably arranged by the clamping hole 24 and the first annular groove 2312. Placed in the valve seat cavity, in the prior art, the first annular protrusion 2313 is arranged in the through hole at the top of the valve body 2 (the first valve body half shell 21 and the second valve body half shell 22 combined splicing body) of the utility model which is formed by one-time injection molding, and the first annular protrusion 2313 is rotatably installed in the above-mentioned first annular groove 2312. The rotatable limiting installation of the first annular protrusion 2313 and the first annular groove 2312 correspondingly limits the valve core body 23 on the one-time injection molding valve body 2, and plays a leading role in the limited rotation installation of the valve core body 23 on the one-time injection molding valve body 2. Therefore, the first annular protrusion is arranged inside The clamping hole 24 of the part 2313 is used to clamp the valve stem 231, and the valve stem 231 is used to drive the valve core body 23 to rotate, so that the core body 23 can adjust the opening or cut off / cut off the valve seat cavity of the utility model. Therefore, the valve stem 231 also rotates in a corresponding manner to press and match with the second circular shaft hole 2314 at the uppermost part of the shell 1 formed by secondary injection molding and close to and surrounding the valve stem 231. The mutual surface pressure contact cooperation between the valve stem 231 and the second circular shaft hole 2314 is not equivalent to the dynamic friction pressure contact sealing cooperation, but the gap or gap between the valve stem 231 and the second circular shaft hole 2314 is very small (no gap or gap is obviously visible to the naked eye), and it does not It has sufficient sealing efficiency and cannot replace the sealing performance of effectively preventing water leakage brought by the sealing cooperation of the sealing ring 2311 and the annular sealing chamber (the second annular groove 2316 + valve stem 231 / accommodating groove); the second circular axial hole 2314 is above the sealing ring 2311. When the utility model is in the process of secondary injection molding, the above-mentioned second circular axial hole 2314 is at the uppermost part of the secondary injection molded shell 1. It is limited by the space of the secondary injection molding mold and the valve stem 231 and surrounds and covers the part of the valve stem 231 exposed outside the valve body 2 of the primary injection molding in a melt-molded manner, and is naturally fixed after cooling.

[0036] As shown in Figure 2 or Figure 6 As shown; it can be understood that the shapes of the card hole 24 located on the first valve body half shell 21 and the second valve body half shell 22 should be symmetrical. At the same time, the structure of the card hole 24 (the first annular protrusion 2313) should also correspond to the first annular groove 2312 provided on the valve stem 231 to ensure effective cooperation between the two.

[0037] In order to improve the stability of the valve core body 23 when installed in the valve seat cavity, a support seat 232 is further provided on the valve core body 23 at the opposite end to the valve stem 231 in this embodiment. At the same time, a cavity-type or hollow-type holder 25 is provided on the inner side of the side wall at the corresponding position of the first valve body half shell 21 and the second valve body half shell 22. As shown in FIG. 2 or 4, the support seat 232 can be nested in the holder 25 and rotated with it. In this embodiment, the holder 25 is different from the holder hole 24, and it does not penetrate the shell wall. In this way, on the one hand, it can provide better support for the valve core body 23 and the valve stem 231, and on the other hand, it ensures that the sealing performance of the sealing ring 2311 is not affected. The structure of the holder 25 can be a semicircular structure corresponding to the holder hole 24, and the second annular protrusion 2317 provided on the outer peripheral wall of the bottom end of the support seat 232 can correspond to the first annular groove 2312 structure, which is consistent with the structure of the first annular protrusion 2313 mentioned above.

[0038] In the principle design of the original utility model, the valve stem 231 rotates relative to the sealing ring 2311 and then drives the valve core body 23 to rotate, so as to adjust the opening of the irrigation valve of the utility model. In actual application, since the sealing ring 2311 and the shell 1 are made of different materials and have poor mutual integration, the two will not be integrated and fixed to each other at all. After the valve stem 231 rotates several times, the sealing ring 2311 always remains unbonded to the shell 1 formed by secondary injection molding. When the valve stem 231 is rotated, the valve stem 231 generally does not drive the sealing ring 2311 to rotate together with the valve stem 231. Even if the valve stem 231 may drive the sealing ring 2311 to rotate, the rotation does not affect the dynamic friction or static friction sealing performance of the sealing ring 2311 on the above-mentioned fitting gap.

[0039] In summary, the irrigation valve of this embodiment abandons the existing traditional external sealing ring 2311 structure, and sets the sealing ring 2311 on the valve stem 231 correspondingly installed on the valve body 2 formed by the first injection molding, and squeezes and limits the sealing ring 2311 between the shell 1 formed by the second injection molding and the valve body 2 formed by the first injection molding through the shell 1 formed by the second injection molding, that is, the sealing ring 2311 is embedded in the valve body 2 through mold compression and extrusion molding, thereby forming a built-in structure of the sealing ring 2311. Compared with the traditional structure, the sealing ring 2311 is embedded in the interior of the irrigation valve, and is not affected by water pressure and loose handle in actual use, and the extrusion force it is subjected to will not change significantly with time. This not only improves the sealing performance of the irrigation valve, but also reduces the use cost of the irrigation valve, and has good market, promotion and use value.

[0040] As a preferred embodiment of the present application, there is one or more than one sealing ring 2311. When there are multiple (or more than two) sealing rings, the multiple sealing rings 2311 are stacked along the axis of the valve stem 231 (i.e., the length direction of the axis or the longitudinal / height direction). The radial width, thickness in a direction perpendicular to the radial direction, and inner diameter (outer diameter) of the multiple stacked sealing rings 2311 are preferably the same. The radial width and radial direction of the annular sealing chamber formed by the second annular groove 2316 and the above-mentioned accommodating groove are substantially equal to the radial width and radial direction of the sealing ring 2311, but the thickness of the annular sealing chamber in a direction perpendicular to the radial direction is the sum of the thicknesses of all the sealing rings 2311. Figure 8 As shown, compared with a single sealing ring 2311, the stacking arrangement of multiple (more than two) sealing rings 2311 can further enhance the sealing performance. At the same time, the sealing structure formed by multiple sealing rings 2311 will also have stronger sealing performance than a single sealing ring 2311. There is no need to worry about leakage / accidents of farmland irrigation water due to sliding wear of the sealing rings 2311 relative to each other or sliding wear of the sealing ring 2311 relative to the first annular groove 2312 of the clamping hole 24 provided on the valve stem 231 during the service life of the valve body 2.

[0041] In this embodiment, multiple (more than two) stacked sealing rings 2311 are located in different receiving grooves, or in the same receiving groove, and the specific selection is based on actual needs. In this embodiment, the former is preferred, which reduces the process cost of setting the valve stem and facilitates increasing the tightness of the contact between each sealing ring 2311, which is beneficial to enhancing the sealing performance.

[0042] In addition, the thickness (height) of a single sealing ring is selected according to actual needs, which will not be elaborated in this embodiment.

[0043] The above is only an embodiment of the utility model, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several improvements can be made without departing from the premise of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of the claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A sealing ring built-in double injection molding irrigation valve, comprising an outer double injection molding shell and an inner single injection molding valve body; the single injection molding valve body comprises a first valve body half shell, a second valve body half shell and a valve core body, the first valve body half shell and the second valve body half shell can be locked to form a valve seat cavity with a through hole; the valve core body is provided with a valve stem, characterized in that: The valve stem is provided with a sealing ring arranged along its circumference and extending along its radial direction. When the valve core body is rotatably arranged in the valve seat cavity, the valve stem thereon extends to the outside of the valve seat cavity through the through hole on the valve seat cavity and the sealing ring on the valve stem covers the outside of the fitting gap between the valve stem and the through hole; the secondary injection molded shell is located outside the primary injection molded valve body and limits the sealing ring between the secondary injection molded shell and the primary injection molded valve body to seal the fitting gap.

2. The sealing ring built-in secondary injection molding irrigation valve according to claim 1, characterized in that: Semicircular clamping holes are respectively provided at the uppermost parts of the side walls at corresponding positions of the first valve body half shell and the second valve body half shell. The clamping holes on the two valve body half shells are connected to form a through hole. At the same time, an annular groove that can be connected with the clamping hole is provided on the valve stem below the sealing ring. The valve core body is rotatably arranged in the valve seat cavity through the clamping hole and the annular groove.

3. The sealing ring built-in secondary injection molding irrigation valve according to claim 2, characterized in that: A support seat is also provided on the valve core body at the end opposite to the valve stem. At the same time, a clamping seat is provided on the inner side of the side wall at the corresponding position of the first valve body half shell and the second valve body half shell. The support seat can be nested in the clamping seat and rotatably cooperate with it.

4. The sealing ring built-in secondary injection molding irrigation valve according to claim 1, characterized in that: The sealing ring is provided with one or more than two. When there are more than two, the plurality of sealing rings are stacked along the axis of the valve stem.

5. The sealing ring built-in secondary injection molding irrigation valve according to claim 1, characterized in that: The valve stem is provided with a receiving groove, the sealing ring is nested in the receiving groove and is fixedly engaged with the receiving groove in a static friction pressure contact seal.

6. The sealing ring built-in secondary injection molding irrigation valve according to claim 5, characterized in that: The uppermost part of the secondary injection-molded shell body is close to and simultaneously surrounds the sealing ring and the annular part of the valve stem, and is cooled and formed to be fixed into a first circular axial hole surrounding the sealing ring. The inner circumference of the first circular axial hole is limited by the space of the sealing ring to form a second annular groove accordingly. The second annular groove and the above-mentioned accommodating groove cooperate with each other to form an annular sealing chamber, and then the sealing ring is limited and embedded in the annular sealing chamber. The sealing ring is tightly fitted with the matching gap between the valve stem and the through hole. The valve body is provided with a first annular protrusion, which is located on the valve stem at a sealing A first annular groove is provided below the sealing ring, and the through hole is surrounded by a first annular protrusion. The through hole at the uppermost part of the valve body formed by the first injection molding is provided with a first annular protrusion, and the first annular protrusion is rotatably installed in the first annular groove. The rotatable limiting installation of the first annular protrusion and the first annular groove correspondingly limits the valve core body on the valve body formed by the first injection molding, and the valve stem also correspondingly rotates in a self-rotating manner to press and fit with the second circular axial hole at the uppermost part of the shell formed by the second injection molding and surrounding the valve stem.

7. The sealing ring built-in secondary injection molding irrigation valve according to claim 6, characterized in that: The sealing ring covers the annular matching gap between the valve stem and the through hole in a contact manner or a non-contact manner.

8. The sealing ring built-in secondary injection molding irrigation valve according to claim 7, characterized in that: The sealing ring covers the fitting gap in a contact manner, and the sealing ring is arranged above the fitting gap. The upper end of the valve stem is located between the first annular protrusion and the sealing ring located above it, and a third annular protrusion and a fourth annular protrusion are correspondingly reserved. The third annular protrusion is a part of the valve stem body and is located between the first annular protrusion and the sealing ring. The fourth annular protrusion is a part of the secondary injection molded shell and is located between the first annular protrusion and the sealing ring. The sealing ring and the second annular groove are statically frictionally sealed and are dynamically frictionally sealed with the accommodating groove.

9. The sealing ring built-in secondary injection molding irrigation valve according to claim 7, characterized in that: The sealing ring covers the annular fitting gap in a non-contact manner, and the sealing ring directly contacts the top surface of the valve body that is injection molded once. The sealing ring and the second annular groove are in static friction and pressure contact seal cooperation, and are in dynamic friction and pressure contact seal cooperation with the accommodating groove, and are also in static friction and pressure contact seal cooperation with the top surface of the valve body that is injection molded once.

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