Limiting type plug valve

Abstract

The utility model provides a limit type plug valve which comprises a hand wheel, a valve body and a plug valve core, a water inlet and a water outlet of the valve body are communicated through a plug column hole, the plug valve core extends into the valve body to plug or open the plug column hole, the plug valve core is provided with a limit column extending out of the valve body, the top end of the limit column is provided with a limit head, and the hand wheel is provided with an installation hole channel. A limiting part is arranged in the mounting hole channel, and the limiting column extends into the mounting hole channel, so that the limiting head is matched with the limiting part to form axial positioning. According to the utility model, the limiting head is matched with the limiting part in a clamping manner, so that the axial positioning of the plug valve core is ensured, and the problem of thread meshing dislocation or disengagement caused by abrasion is thoroughly avoided. In the opening state, the opening precision is effectively controlled; and in the closed state, the closure tightness is improved, and the stability and accuracy of the valve are ensured. And the limiting head is in interference fit with the limiting part, so that the limiting column and the hand wheel are prevented from loosening, and the structural firmness of the valve is enhanced.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology and relates to an angle valve, particularly a limit-type plug valve. Background Technology

[0002] Angle valves are angle-type stop valves. Similar to ball valves, their structure and characteristics are modified from ball valves. The difference between angle valves and ball valves is that the outlet and inlet of an angle valve are at a 90-degree right angle. Angle valves are also called triangular valves, angle valves, or angle water valves. Single-seat regulating valves are one of the commonly used fluid control devices.

[0003] A typical angle valve consists of a valve body, a valve core, and a valve stem. The inner end of the valve stem is connected to the valve core, and the outer end of the valve stem extends out of the valve body and is connected to the handle. One end of the valve body is the inlet end, and the other end is the outlet end. The valve stem is rotated by the handle, which in turn rotates the valve core to cut off or connect the inlet and outlet ends.

[0004] In existing valve bodies, screws are typically used to thread the handle and valve stem together. For example, Chinese patent document 201320250806.7 discloses a ball valve, which mainly solves the technical problems of existing threaded connections between the valve stem and valve core, such as the valve stem easily flying out, causing media leakage, and posing significant safety hazards. Its key feature is that the end of the valve stem placed inside the valve body has an annular boss. The outer diameter of this annular boss is larger than the inner diameter of the mounting hole and fits snugly against the inner wall of the valve body for sealing. The beneficial effect of this invention is that by setting an annular boss on the valve stem, during valve use, when the valve core is under significant pressure, the valve core will transmit the pressure to the valve stem. At this time, due to the obstruction of the annular boss, the valve stem will not suddenly pop out of the valve body, effectively ensuring the valve's sealing performance and operational safety.

[0005] In the above technical solution, screws are used to lock the handle and valve stem. However, after a long period of turning and switching operations, the threads of the screw and valve stem are easily worn, causing the locking relationship between the two to loosen. This affects the accuracy of valve opening and the tightness of valve closing, and may even cause the valve stem and valve core to fall off, resulting in axial positioning failure. Utility Model Content

[0006] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a limit-type plug valve.

[0007] The objective of this utility model can be achieved through the following technical solution: A limiting plug valve includes a handwheel, a valve body, and a plug valve core. The inlet and outlet of the valve body are connected through a plug hole. The plug valve core extends into the valve body to block or open the plug hole. The plug valve core has a limiting post extending out of the valve body. The top of the limiting post has a limiting head. The handwheel has a mounting channel. A limiting part is provided in the mounting channel. The limiting post extends into the mounting channel, so that the limiting head cooperates with the limiting part to form axial positioning.

[0008] In the aforementioned limit-type plug valve, the limiting head is a conical head at the top of the limiting column, and an annular groove is provided at the bottom of the conical head. The limiting part is a circular boss in the mounting channel. The conical head passes through the circular boss along the mounting channel, and the circular boss is embedded in the annular groove to form a snap-fit.

[0009] In the aforementioned limit-type plug valve, the top surface of the conical head is a small-diameter end face and the bottom surface is a large-diameter end face. The conical wall of the conical head gradually increases from the small-diameter end face to the large-diameter end face. The diameter of the small-diameter end face is smaller than the inner ring diameter of the annular boss, and the diameter of the large-diameter end face is larger than the inner ring diameter of the annular boss.

[0010] In the aforementioned limit-type plug valve, the annular boss and the annular groove are matched, and the bottom surface of the conical head is attached to the top surface of the annular boss to form axial positioning.

[0011] In the aforementioned limit-type plug valve, the limiting head is a hemispherical head at the top of the limiting column. The hemispherical head has an upward-facing spherical surface and a downward-facing bottom plane. An annular groove is provided below the bottom plane. The limiting part consists of several toothed pieces inside the mounting channel. The several toothed pieces are arranged in an annular array. The hemispherical head passes through the several toothed pieces along the mounting channel, and the several toothed pieces are embedded in the annular groove to form a snap-fit.

[0012] In the aforementioned limit-type plug valve, the cross-sectional diameter of the hemispherical head gradually increases from the apex to the bottom plane, and the diameter of the bottom plane is greater than the inner ring diameter surrounded by several toothed plates.

[0013] In the aforementioned limit-type plug valve, the limit post is a polygonal post, the mounting channel is a polygonal channel, and the polygonal post and the polygonal channel form a matching connection.

[0014] In the aforementioned limit-type plug valve, the handwheel is a housing with a concave cavity. The housing has a top wall, a side wall, and a bottom opening. An installation tube is fixedly connected to the center of the top wall inside the concave cavity. The cavity of the installation tube forms the installation channel. The bottom end of the installation channel is the installation opening. The side wall has concave and convex portions.

[0015] In the aforementioned limit-type plug valve, an assembly interface is provided on the valve body, an internal thread is provided on the inner wall of the assembly interface, and an external thread is provided on the outer wall of the plug valve core. The plug valve core passes through the assembly interface to form a threaded engagement connection. A first sealing ring is fitted on the plug valve core, and the first sealing ring is tightly fitted against the inner wall of the assembly interface. A second sealing ring is provided at the plug hole, and the second sealing ring is tightly fitted against the outer wall of the plug valve core.

[0016] In the aforementioned limit-type plug valve, there is one inlet and at least one outlet. The central axis of the inlet is perpendicular to the central axis of the outlet. An inlet connection thread is provided on the outer wall of the inlet, and an outlet connection thread is provided on the outer wall of the outlet.

[0017] Compared with existing technologies, this limit-type plug valve has the following advantages:

[0018] 1. Precise limit control: The snap-fit ​​between the limit head and the limit part ensures the axial positioning of the plug valve core, completely avoiding the problem of thread misalignment or disengagement due to wear. In the open state, it effectively controls the opening accuracy; in the closed state, it improves the tightness of the flow control, ensuring the stability and accuracy of the valve.

[0019] 2. Interference Fit and Reliable Connection: The design employs a conical head and annular boss or a hemispherical head and toothed plate to create a robust connection between the plug valve core and the handwheel. The gradual increase in the size of the conical or hemispherical head ensures an interference fit under certain pressure, preventing loosening of the limit pin and handwheel and enhancing the valve's structural robustness.

[0020] 3. Strong material compatibility: The combination of the metal material of the limit post and the plastic material inside the handwheel forms an optimal material match, ensuring not only the robustness and durability of each component but also reducing manufacturing costs. The flexibility of the plastic parts and the rigidity of the metal parts complement each other, providing a good interference fit.

[0021] 4. Customizable Design: Different limit head shapes and limit part shapes can be adjusted according to specific needs. Through flexible design, it can be optimized and customized in different application environments.

[0022] In summary, limit-type plug valves, with their precise limit design, excellent sealing performance, and convenient operation, have broad application potential in many fields, and are especially suitable for fluid control systems that require high reliability and long service life. Attached Figure Description

[0023] Figure 1 This is a cross-sectional view of the open state of Embodiment 1 of this limit-type plug valve.

[0024] Figure 2 This is a cross-sectional view of the closed state of Embodiment 1 of this limit-type plug valve.

[0025] Figure 3 This is a top view of the limit-position plug valve.

[0026] Figure 4 This is a cross-sectional view of the open state of Embodiment 2 of this limit-type plug valve.

[0027] Figure 5 This is a top view of the toothed plate in Embodiment 2 of this limit-type plug valve.

[0028] In the diagram, 1 is the handwheel; 1a is the mounting pipe; 2 is the valve body; 2a is the inlet; 2b is the outlet; 3 is the stopcock valve core; 4 is the limit pin; 5 is the conical head; 6 is the annular boss; 7 is the first sealing ring; 8 is the second sealing ring; 9 is the hemispherical head; and 10 is the toothed plate. Detailed Implementation

[0029] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0030] Example 1

[0031] like Figures 1 to 3 As shown, this limiting plug valve includes a handwheel 1, a valve body 2, and a plug valve core 3. The inlet 2a and outlet 2b of the valve body 2 are connected through a plug hole. The plug valve core 3 extends into the valve body 2 to block or open the plug hole. The plug valve core 3 has a limiting post 4 extending out of the valve body 2. The top of the limiting post 4 has a limiting head. The handwheel 1 has an installation channel. A limiting part is provided in the installation channel. The limiting post 4 extends into the installation channel, so that the limiting head cooperates with the limiting part to form axial positioning.

[0032] Figure 1 and 2 As shown, an assembly interface is provided on the valve body 2, and an internal thread is provided on the inner wall of the assembly interface. An external thread is provided on the outer wall of the plug valve core 3. The plug valve core 3 passes through the assembly interface to form a threaded engagement connection. A sealing ring 7 is fitted on the plug valve core 3. The sealing ring 7 is in close contact with the inner wall of the assembly interface. A sealing ring 8 is provided at the plug hole. The sealing ring 8 is in close contact with the outer wall of the plug valve core 3.

[0033] The plug valve core 3 is threadedly engaged with the valve body 2, and the plug valve core 3 rises or falls under the drive of rotation, corresponding to the opening or closing of the valve. Sealing ring 7 seals the gap between the plug valve core 3 and the assembly interface to prevent leakage. When the valve body 2 is closed, sealing ring 8 seals the plug valve core 3 and the plug hole, ensuring the tightness of the valve body 2 when closed.

[0034] There is one inlet 2a and at least one outlet 2b. The central axis of the inlet 2a is perpendicular to the central axis of the outlet 2b. The outer wall of the inlet 2a is provided with an inlet connection thread for connecting the inlet pipe. The outer wall of the outlet 2b is provided with an outlet connection thread for connecting the outlet pipe.

[0035] Figure 1 and 2 As shown, the limiting head is a conical head 5 at the top of the limiting post 4. An annular groove is provided at the bottom of the conical head 5. The limiting part is a circular boss 6 in the mounting hole. The conical head 5 passes through the circular boss 6 along the mounting hole, and the circular boss 6 is embedded in the annular groove to form a snap-fit.

[0036] The top surface of the conical head 5 is the small diameter end face, and the bottom surface is the large diameter end face. The conical wall of the conical head 5 gradually increases from the small diameter end face to the large diameter end face. The diameter of the small diameter end face is smaller than the inner ring diameter of the annular boss 6, and the diameter of the large diameter end face is larger than the inner ring diameter of the annular boss 6.

[0037] Handwheel 1 is made of plastic injection molding, so the annular boss 6 is also made of plastic, allowing it to deform under certain pressure. The plug valve core 3 and the limiting post 4 are integrally molded from metal, giving the limiting post 4 a certain degree of hardness. The limiting post 4 is inserted into the mounting hole of handwheel 1, allowing the small-diameter end face of the conical head 5 to pass through the annular boss 6. As the diameter of the conical head 5 gradually increases, it compresses the annular boss 6, forming an interference fit, until the large-diameter end face of the conical head 5 passes through the annular boss 6, forming a limiting engagement, thus completing the fixed assembly of the limiting post 4 and handwheel 1.

[0038] The annular boss 6 is matched with the annular groove, and the bottom surface of the conical head 5 is attached to the top surface of the annular boss 6 to form axial positioning. The thickness of the annular boss 6 is the same as the height of the annular groove. Thus, after the two are engaged, the limiting post 4 is fixed in axial position. In addition, the snap-fit ​​between the conical head 5 and the annular boss 6 prevents the limiting post 4 from shifting or falling out.

[0039] The limiting post 4 is a polygonal column, and the mounting channel is a polygonal channel, forming a matching connection between the polygonal column and the polygonal channel. In this embodiment, the limiting post 4 is specifically a square column, and the mounting channel is specifically a square hole, and their dimensions match. Polygons with other numbers of sides can also be used, as long as the number of sides of the limiting post 4 matches the number of sides of the mounting channel. Thus, after the limiting post 4 is inserted into the mounting channel, a circumferential limit is formed. Turning the handwheel 1 synchronously drives the limiting post 4 and the stop valve core 3 to rotate, thereby achieving the opening and closing of the valve.

[0040] Figures 1 to 3As shown, the handwheel 1 is a housing with a cavity. The housing has a top wall, side walls, and a bottom opening. A mounting tube 1a is fixedly disposed at the center of the top wall within the cavity. The cavity of the mounting tube 1a forms a mounting channel, and the bottom end of the mounting channel is the mounting opening. The side wall has protrusions and recesses. The mounting tube 1a provides mounting space for the limiting post 4, and the limiting part is disposed on the inner wall of the mounting tube 1a. The protrusions and recesses provide a point of force for the fingers to grip, so as to drive the handwheel 1 to rotate.

[0041] Installation and application methods for this limit-type plug valve:

[0042] The limiting post 4 of the plug valve core 3 is inserted into the mounting tube 1a of the handwheel 1. When the limiting head of the limiting post 4 reaches the limiting part, a certain pressing force is used to force the limiting head through the limiting part to form a locking connection. This achieves the positioning function of the plug valve core 3 in the axial direction. This installation method is more convenient and faster, and reduces valve costs.

[0043] Despite repeated rotations of the handwheel 1 to drive the valve core 3 to rise and fall, the locking action of the limiting head and the limiting part ensures a stable connection between the handwheel 1 and the valve core 3, and maintains the axial positioning of the valve core 3, thus ensuring the accuracy of the valve opening and the tightness of the closure.

[0044] Example 2

[0045] This embodiment is basically the same as Embodiment 1, except that:

[0046] like Figure 4 and 5 As shown, the limiting head is a hemispherical head 9 at the top of the limiting post 4. The hemispherical head 9 has an upward spherical surface and a downward bottom plane. An annular groove is provided below the bottom plane. The limiting part consists of several toothed pieces 10 in the mounting channel. The several toothed pieces 10 are arranged in an annular array. The hemispherical head 9 passes through the several toothed pieces 10 along the mounting channel. The several toothed pieces 10 are embedded in the annular groove to form a snap-fit.

[0047] The cross-sectional diameter of the hemispherical head 9 gradually increases from the apex to the bottom plane, and the diameter of the bottom plane is greater than the inner diameter of the several toothed plates 10.

[0048] The handwheel 1 is made of plastic injection molding, and therefore the toothed plates 10 are also made of plastic, allowing them to deform under certain pressure. The plug valve core 3 and the limiting post 4 are integrally molded from metal, giving the limiting post 4 a certain degree of hardness. The limiting post 4 is inserted into the mounting hole of the handwheel 1, so that the upper part of the hemispherical head 9 passes through the inner ring surrounded by the toothed plates 10. As the diameter of the hemispherical head 9 gradually increases, it compresses the toothed plates 10, forming an interference fit, until the bottom plane of the hemispherical head 9 passes through the toothed plates 10. The toothed plates 10 are then embedded in the annular groove to form a limiting engagement, completing the fixed assembly of the limiting post 4 and the handwheel 1.

[0049] The specific embodiments described herein are merely illustrative examples of the spirit of this invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or substitute them with similar methods, without departing from the spirit of this invention or exceeding its defined scope. Although this invention has been detailed and described in the accompanying drawings and foregoing description, such descriptions are considered illustrative or exemplary rather than restrictive. It should be understood that changes and modifications can be made by those skilled in the art within the scope of the following claims. Specifically, this invention covers additional embodiments having any combination of features from the different embodiments described above. With regard to the use of the expressions "general" or "substantially," this patent application should be understood to disclose that the disclosure equally fully satisfies these features and values, i.e., without any of the foregoing characterizations as "general" or "substantially."

[0050] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A stop type cock valve comprising a hand wheel, a valve body and a plug core, the water inlet and the water outlet of the valve body are communicated through a plug column hole, characterized in that, The plug valve core extends into the valve body to block or open the plug column hole, the plug valve core has a limiting column extending out of the valve body, the top end of the limiting column has a limiting head, the hand wheel has a mounting channel, the limiting column extends into the mounting channel, the limiting head cooperates with the limiting part to form axial positioning, the limiting head is a tapered head at the top end of the limiting column, the bottom of the tapered head is provided with an annular groove, the limiting part is a circular ring boss in the mounting channel, the tapered head passes through the circular ring boss along the mounting channel, the circular ring boss is embedded in the annular groove to form clamping, the top surface of the tapered head is a small-diameter end surface, the bottom surface is a large-diameter end surface, the tapered wall of the tapered head gradually increases from the small-diameter end surface to the large-diameter end surface, the diameter of the small-diameter end surface is smaller than the inner ring diameter of the circular ring boss, and the diameter of the large-diameter end surface is larger than the inner ring diameter of the circular ring boss.

2. The check valve according to claim 1, wherein The circular ring boss and the annular groove are matched, and the bottom surface of the tapered head is attached to the top surface of the circular ring boss to form axial positioning.

3. The check type cock valve according to claim 1, wherein The limiting head is a hemispherical head at the top end of the limiting column, the hemispherical head has an upward spherical surface and a downward bottom plane, an annular groove is arranged below the bottom plane, and the limiting part is a plurality of tooth pieces in the mounting channel. A plurality of tooth pieces are arranged in a circular array, the hemispherical head passes through a plurality of tooth pieces along the mounting channel, and a plurality of tooth pieces are embedded in the annular groove to form clamping.

4. The check valve according to claim 3, wherein The cross-sectional diameter of the hemispherical head gradually increases from the apex to the bottom plane, and the diameter of the bottom plane is greater than the inner ring diameter of the ring surrounded by the plurality of tooth pieces.

5. The check valve according to claim 1, wherein The limiting column is a polygonal column, the mounting channel is a polygonal channel, and the polygonal column and the polygonal channel are matched and connected.

6. The check valve according to claim 1, wherein The hand wheel is a shell with a concave cavity, the shell has a top wall, a side wall and a bottom opening, an installation pipe is fixedly connected in the center of the top wall in the concave cavity, a pipe cavity of the installation pipe forms the mounting channel, a bottom end of the mounting channel is an installation opening, and the side wall is provided with a concave-convex part.

7. The check valve according to claim 1, wherein An assembly interface is formed on the valve body, an internal thread is arranged on an inner wall of the assembly interface, an external thread is arranged on an outer wall of the plug valve core, the plug valve core is connected to the assembly interface to form a threaded engagement connection, a sealing ring I is sleeved on the plug valve core, and the sealing ring I is tightly attached to the inner wall of the assembly interface. A sealing ring II is arranged at the plug column hole, and the sealing ring II is tightly attached to the outer wall of the plug valve core.

8. The check valve of claim 1, wherein The number of the water inlet is one, the number of the water outlet is at least one, and the central axis of the water inlet is arranged perpendicular to the central axis of the water outlet; an inlet connecting thread is arranged on the outer wall of the water inlet, and an outlet connecting thread is arranged on the outer wall of the water outlet.

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