Micro flow regulating valve with rotary valve core

Abstract

The utility model provides a micro-flow regulating valve with a rotary valve core. The micro-flow regulating valve comprises a valve body, a valve seat and a valve core component, wherein the valve seat and the valve core component are arranged in the valve body; the valve seat is provided with a throttling groove, and the sectional area of the throttling groove is gradually increased. A first through-flow hole is further formed in the valve seat and communicates with the throttling groove. The valve element assembly comprises a rotatable throttling ring, and the bottom face of the throttling ring abuts against the top face of the valve seat. The throttling ring is provided with a second through-flow hole, and when the second through-flow hole is located at the first position, the second through-flow hole is not overlapped with the throttling groove and the first through-flow hole; when the second through-flow hole rotates from the first position to the second position, the second through-flow hole, the throttling groove and the first through-flow hole are partially overlapped to be completely overlapped. The micro flow regulating valve with the rotary valve element has the advantages of being long in service life, safe, reliable and high in regulating precision.

Description

Technical Field

[0001] The utility model relates to the technical field of regulating valves, in particular to a rotary valve core micro-flow regulating valve. Background Art

[0002] The traditional micro-flow control valve belongs to the linear stroke control valve, which is assembled by the valve body, valve cover, linear stroke valve core, valve seat and sleeve. The flow control characteristics are changed by changing the shape of the valve core head, and the adjustment is achieved by lifting and lowering the valve core. There are three main problems with the above control valve: First, the valve core head needs to be processed to an ultra-small diameter to achieve micro-flow regulation, which makes the valve core head low in strength and very easy to damage; second, the sealing surface is always affected by medium erosion and cavitation, which is very easy to be damaged and cause sealing failure; third, the matching size processing error of the valve core and the valve seat is large, and the actual flow characteristics deviate greatly from the designed flow characteristics, and it is impossible to achieve effective adjustment according to the flow characteristics.

[0003] Therefore, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the prior art. Utility Model Content

[0004] The utility model aims to provide a rotary valve core micro-flow regulating valve, which has the characteristics of long service life, safety and reliability, and high regulating precision.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A rotary valve core micro-flow regulating valve, comprising a valve body, a valve seat and a valve core assembly arranged in the valve body;

[0007] The valve seat is provided with a throttling groove, the two ends of the throttling groove are respectively a first end and a second end, and the cross-sectional area of ​​the throttling groove gradually increases from the first end to the second end; the valve seat is also provided with a first flow hole, and the first flow hole is connected to the second end of the throttling groove;

[0008] The valve core assembly includes a rotatable throttling ring, the bottom surface of the throttling ring is against the top surface of the valve seat; the throttling ring is provided with a second flow hole, when the throttling ring rotates, the second flow hole rotates between a first position and a second position; when the second flow hole is located at the first position, the second flow hole does not overlap with the throttling groove and the first flow hole; when the second flow hole rotates from the first position to the second position, the second flow hole partially overlaps with the throttling groove and the first flow hole and then completely overlaps.

[0009] According to one embodiment of the present utility model, the center line of the throttling groove is in an arc shape, and the axes of the first flow hole and the second flow hole are both located on the center line of the throttling groove.

[0010] According to one embodiment of the present utility model, the diameter of the second through-flow hole is greater than the diameter of the first through-flow hole, and the diameter of the first through-flow hole is greater than the width of the second end of the throttling groove.

[0011] According to one embodiment of the utility model, the valve body is penetrated by a valve stem, the part of the valve stem located in the valve body is provided with an annular protrusion, and the bottom end of the valve stem is connected to the top of the throttling ring; the valve core assembly also includes a sleeve ring, which is sleeved on the outside of the throttling ring, and the side wall of the sleeve ring is provided with a third flow hole; a gasket is fixedly provided on the top of the sleeve ring, and the gasket is sleeved on the valve stem and abutted against the bottom surface of the annular protrusion; a spring is provided between the gasket and the throttling ring.

[0012] According to an embodiment of the utility model, the bottom end of the valve stem is in a rectangular parallelepiped shape, and the top of the throttling ring is provided with a through groove with a rectangular cross-section.

[0013] According to an embodiment of the utility model, a retaining spring is embedded in the inner wall of the sleeve ring, and the top of the gasket ring abuts against the bottom surface of the retaining spring.

[0014] According to one embodiment of the utility model, a valve cover is fixedly provided on the top of the valve body, and the valve stem is inserted into the valve cover; a sleeve is provided between the valve cover and the valve seat, and the sleeve is provided on the outer periphery of the valve core assembly; the bottom of the sleeve is connected to the valve seat by a vertical pin shaft, and the top of the sleeve is connected to the valve cover by a transverse pin shaft; and a fourth flow hole is provided on the side wall of the sleeve.

[0015] According to an embodiment of the utility model, a shaft sleeve is provided at the bottom end of the valve cover, and the valve stem is inserted into the shaft sleeve.

[0016] According to an embodiment of the present invention, the number of the second flow holes is two, and they are symmetrically arranged around the center of the throttling ring.

[0017] According to an embodiment of the present utility model, the angle between the first position, the second position and the line connecting the center of the throttling ring is 90 degrees.

[0018] Compared with the prior art, the advantages and beneficial effects of the embodiments of the present invention are:

[0019] The rotary valve core micro-flow regulating valve provided by the embodiment of the utility model adopts a flat compression seal on the sealing surface, and the flow area of ​​the throttling groove on the valve seat is adjusted by rotating the throttling ring of the valve core assembly. During the rotation process, the throttling ring of the valve core assembly and the valve seat are always sealed and fitted, the sealing surface area is large and is not affected by medium erosion and cavitation, and the service life of parts and seals is greatly improved. Since the throttling ring of the valve core assembly and the valve seat are in relative rotation motion and there is no sliding gap, the actual flow characteristics are basically consistent with the designed flow characteristics, which effectively improves the accuracy of the adjustment of the working condition parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. Among them:

[0021] Figure 1 A schematic diagram of the structure of a rotary valve core micro-flow regulating valve provided in an embodiment of the utility model;

[0022] Figure 2 A schematic diagram of the connection structure between the valve core assembly and the valve seat of the rotary valve core micro-flow regulating valve provided in an embodiment of the utility model;

[0023] Figure 3 A top view of a valve seat of a rotary valve core micro-flow regulating valve provided in an embodiment of the utility model;

[0024] Figure 4 for Figure 3 Sectional view in the AA direction;

[0025] Figure 5 A schematic diagram of the structure of a valve core assembly of a rotary valve core micro-flow regulating valve provided by an embodiment of the utility model;

[0026] Figure 6 A cross-sectional view of a throttling ring of a rotary valve core micro-flow regulating valve provided by an embodiment of the utility model;

[0027] Figure 7 A top view of a throttling ring of a rotary valve core micro-flow regulating valve provided by an embodiment of the utility model;

[0028] Figure 8 A cross-sectional view of a sleeve of a rotary valve core micro-flow regulating valve provided by an embodiment of the utility model;

[0029] Fig. 9 A top view of a sleeve of a rotary valve core micro-flow regulating valve provided by an embodiment of the utility model;

[0030] Fig.10A front view of a valve stem of a rotary valve core micro-flow regulating valve provided by an embodiment of the utility model;

[0031] Fig.11 A side view of a valve stem of a rotary valve core micro-flow regulating valve provided by an embodiment of the utility model;

[0032] Fig.12 A schematic diagram of the structure of a rotary valve core micro-flow regulating valve provided by an embodiment of the utility model when the throttling ring is located in the first position;

[0033] Fig.13 A schematic structural diagram of a rotary valve core micro-flow regulating valve provided in an embodiment of the utility model when the throttling ring is located between a first position and a second position.

[0034] Description of reference numerals:

[0035] 1. Valve body; 11. Inlet pipe; 12. Outlet pipe; 2. Valve seat; 21. Throttle groove; 22. First flow hole; 23. First pin hole; 3. Valve core assembly; 31. Throttle ring; 311. Second flow hole; 312. Through groove; 32. Sleeve; 321. Third flow hole; 33. Gasket; 34. Spring; 35. Retaining ring; 4. Valve stem; 41. Annular protrusion; 5. Valve cover; 51. Bushing; 6. Sleeve; 61. Vertical pin shaft; 62. Horizontal pin shaft; 63. Fourth flow hole; 64. Second pin hole; 65. Third pin hole; 7. Gasket. DETAILED DESCRIPTION

[0036] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. Each example is provided by way of explanation of the present invention and does not limit the present invention. In fact, it will be clear to those skilled in the art that modifications and variations may be made in the present invention without departing from the scope or spirit of the present invention. For example, a feature shown or described as a part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desired that the present invention includes such modifications and variations within the scope of the appended claims and their equivalents.

[0037] In the description of the present invention, "first", "second" and similar words do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprising" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, but do not exclude other elements or objects. The directions or positional relationships indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like are based on the directions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention. The terms "connected", "connected" and "set" used in the present invention should be understood in a broad sense, for example, they can be fixedly connected or detachably connected; they can be directly connected or indirectly connected through an intermediate component; they can be wired electrical connections, radio connections, or wireless communication signal connections. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0038] like Figure 1 , Figure 2 As shown, the present utility model provides a rotary valve core micro-flow regulating valve, comprising a valve body 1, a valve seat 2 and a valve core assembly 3 arranged in the valve body 1. Figure 1 The top of the Figure 1 The bottom is defined as the bottom.

[0039] like Figure 3 , Figure 4 As shown, the valve seat 2 can be cylindrical, with a throttling groove 21 on the top surface, the two ends of the throttling groove 21 are respectively a first end and a second end, and the cross-sectional area of ​​the throttling groove 21 gradually increases from the first end to the second end. The valve seat 2 is also penetrated by a vertical first flow hole 22, and the first flow hole 22 is connected to the second end of the throttling groove 21. The valve body 1 is provided with an inlet pipe 11 and an outlet pipe 12, and its structure is the prior art and will not be repeated. The medium can flow from the inlet pipe 11 of the valve body 1 through the first flow hole 22 and the throttling groove 21 in sequence to the outlet pipe 12 of the valve body 1.

[0040] like Figure 5-Figure 7 As shown, the valve core assembly 3 includes a rotatable throttle ring 31, the bottom surface of the throttle ring 31 always abuts against the top surface of the valve seat 2. The throttle ring 31 is penetrated by a second vertical flow hole 311, and when the throttle ring 31 rotates, the second flow hole 311 rotates between a first position and a second position. Fig.12 , Fig.13As shown, when the second flow hole 311 is located at the first position, the second flow hole 311 does not overlap with the throttling groove 21 and the first flow hole 22. At this time, the throttling ring 31 of the valve core assembly 3 seals the first flow hole 22 and the throttling groove 21; when the second flow hole 311 rotates from the first position to the second position, the second flow hole 311 and the throttling groove 21 and the first flow hole 22 overlap from partial overlap to complete overlap. At this time, the second flow hole 311 of the throttling ring 31 is connected with the throttling groove 21 and the first flow hole 22, and the conduction area increases as the overlapping area of ​​the second flow hole 311, the throttling groove 21 and the first flow hole 22 gradually increases. When the second flow hole 311 and the first flow hole 22 completely overlap, the flow rate reaches a maximum.

[0041] The rotary valve core micro-flow regulating valve provided by the embodiment of the utility model adopts a flat compression seal on the sealing surface, and the flow area of ​​the throttling groove 21 on the valve seat 2 is adjusted by rotating the throttling ring 31 of the valve core assembly 3. During the rotation process, the throttling ring 31 of the valve core assembly 3 and the valve seat 2 are always sealed and fitted, and the sealing surface area is large and is not affected by medium erosion and cavitation, and the service life of parts and seals is greatly improved. Since the throttling ring 31 of the valve core assembly 3 and the valve seat 2 are in relative rotation motion and there is no sliding gap, the actual flow characteristics are basically consistent with the designed flow characteristics, which effectively improves the accuracy of the adjustment of the working condition parameters.

[0042] like Figure 3 As shown, in order to make the flow rate adjustment uniform when the throttle ring 31 rotates from the first position to the second position, in a preferred embodiment of the utility model, the center line of the throttle groove 21 is in an arc shape, and the axes of the first through-flow hole 22 and the second through-flow hole 311 are both located on the center line of the throttle groove 21. Further, the diameter of the second through-flow hole 311 is greater than the diameter of the first through-flow hole 22, and the diameter of the first through-flow hole 22 is greater than the width of the second end of the throttle groove 21.

[0043] like Figure 1 , Figure 2 , Fig.10 , Fig.11 As shown, in one embodiment of the utility model, the valve body 1 is penetrated by a valve stem 4, and the portion of the valve stem 4 located inside the valve body 1 is provided with an annular protrusion 41, and the bottom end of the valve stem 4 is connected to the top of the throttling ring 31, so as to drive the throttling ring 31 to rotate from the outside. Figure 2 , Figure 5As shown, the valve core assembly 3 also includes a collar 32, which is sleeved on the outer side of the throttle ring 31, and a barb structure is provided between the bottom end of the collar 32 and the top end of the throttle ring 31 to prevent loosening, and a third flow hole 321 is provided on the side wall of the collar 32. A gasket 33 is fixedly provided on the top of the collar 32, and the gasket 33 is sleeved on the valve stem 4 and abuts against the bottom surface of the annular protrusion 41. A spring 34 is provided between the gasket 33 and the throttle ring 31, which presses the throttle ring 31 against the valve seat 2, and drives the throttle ring 31 to rotate through the rotation of the valve stem 4 to form a rotating plane seal. In addition, the preload force generated by the compressed spring 34 can effectively improve the sealing effect between the throttle ring 31 and the valve seat 2 and has the wear compensation ability (that is, it can adapt to the displacement between the throttle ring 31 and the valve seat 2 due to wear), ensuring long-term high-performance sealing. The force of the spring 34 causes the lower plane of the throttle ring 31 to be combined with the upper plane of the valve seat 2 to achieve sealing, and the leakage level is not lower than ANSI / FCI 70-2-IV level.

[0044] like Fig.10 , Fig.11 As shown, in one embodiment of the present invention, the bottom end of the valve stem 4 is in a rectangular parallelepiped shape, and the top of the throttle ring 31 is provided with a through groove 312 with a rectangular cross section. The bottom end of the valve stem 4 is inserted into the through groove 312 of the throttle ring 31. Due to the corresponding shapes, when the valve stem 4 rotates, the throttle ring 31 can be driven to rotate, thereby adjusting the flow of the medium passing through the second through hole 311. Figure 1 As shown, the top of the valve stem 4 is located outside the valve body 1 and is provided with a handle or a rotating flange for rotation operation.

[0045] like Figure 5 As shown, a retaining spring 35 is embedded in the inner wall of the sleeve ring 32, and the top of the gasket ring 33 abuts against the bottom of the retaining spring 35. By providing the retaining spring 35, the gasket ring 33 can be detachably arranged in the sleeve ring 32, which is convenient for disassembly, maintenance and replacement of the entire valve core assembly 3.

[0046] like Figure 1 , Figure 2 As shown, in one embodiment of the utility model, a valve cover 5 is fixedly arranged on the top of the valve body 1, and the valve stem 4 is inserted into the valve cover 5. A sleeve 6 is arranged between the valve cover 5 and the valve seat 2, and the sleeve 6 is arranged on the outer periphery of the valve core assembly 3. The bottom of the sleeve 6 is connected to the valve seat 2 through a vertical pin 61, and the top of the sleeve 6 is connected to the valve cover 5 through a horizontal pin 62. Correspondingly, as Figure 3 , Figure 4As shown, the valve seat 2 is provided with a first pin hole 23 corresponding to the vertical pin shaft 61. The side wall of the sleeve 6 is provided with a fourth flow hole 63, and the bottom of the sleeve 6 is provided with a second pin hole 64 corresponding to the vertical pin shaft 61 and a third pin hole 65 corresponding to the transverse pin shaft 62. Preferably, the fourth flow hole 63 is arranged corresponding to the third flow hole 321 to reduce the flow resistance of the medium. Figure 2 As shown, the bottom end of the valve cover 5 is press-fitted with a shaft sleeve 51, and the valve stem 4 is inserted into the shaft sleeve 51, and the shaft sleeve 51 guides the rotation and sliding of the valve stem 4. Figure 2 As shown, the valve body 1 and the valve seat 2 , as well as the valve body 1 and the valve cover 5 are sealed by gaskets 7 .

[0047] like Figure 6 Figure 7 As shown, in one embodiment of the present invention, the number of the second through-flow holes 311 is two, and they are symmetrically arranged around the center of the throttle ring 31 .

[0048] like Fig.12 , Fig.13 As shown, the starting position of the throttling groove 21 forms a certain angle with the transverse axis of the valve seat 2, and the center of the first through hole 22 forms a certain angle with the vertical axis of the valve seat 2. In one embodiment of the utility model, the angle between the connecting line of the first position, the second position and the center of the throttling ring 31 is 90 degrees, so that the rotation angle of the throttling ring 31 of the valve core assembly 3 is 0-90 degrees, that is, the rated stroke of the valve is 90 degrees. When the throttle ring 31 rotates at an angle of 0° (located at the first position), the starting angle between the second through-hole 311 and the throttle groove 21 is α. At this time, the throttle groove 21 is staggered with the second through-hole 311, and the lower plane of the throttle ring 31 is in contact with the upper plane of the valve seat 2 to achieve sealing, so that the medium flow cannot pass through. As the counterclockwise rotation angle of the throttle ring 31 increases, the throttling area of ​​the throttle groove 21 increases, that is, the medium flow also increases. When the rotation angle of the throttle ring 31 is 90°, the angle between the second through-hole 311 and the first through-hole 22 is β, so that all the medium The mass flow rate is throttled by the throttling groove 21. By designing the throttling area of ​​the throttling groove 21 when the throttling ring 31 rotates at different angles, various flow characteristics and different flow capacities required for actual working conditions can be achieved. The sealing area of ​​the lower plane of the throttling ring 31 and the upper plane of the valve seat 2 is large and is not affected by medium erosion and cavitation, which can greatly improve the life of parts and seals. The throttling ring 31 of the valve core assembly 3 and the valve seat 2 are in relative rotational motion, and there is no sliding gap, so the actual flow characteristics are basically consistent with the designed flow characteristics, effectively improving the accuracy of operating parameter adjustment.

[0049] In one embodiment of the present invention, the throttling ring 31 coincides with the central axis of the valve seat 2, and the center of the circle on which the center line of the throttling groove 21 lies is located on the central axis of the throttling ring 31, so that the flow regulation performed when the throttling ring 31 rotates from the first position to the second position is uniform and accurate.

[0050] In an embodiment of the present invention, the throttling groove 21 and the first through-hole 22 form an inlet assembly. The number of the inlet assemblies can be two and they are symmetrically arranged about the central axis of the valve seat 2 .

[0051] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A rotary valve core micro-flow regulating valve, characterized in that: It comprises a valve body (1), and a valve seat (2) and a valve core assembly (3) arranged in the valve body (1); The valve seat (2) is provided with a throttling groove (21), the two ends of the throttling groove (21) are respectively a first end and a second end, and the cross-sectional area of ​​the throttling groove (21) gradually increases from the first end to the second end; the valve seat (2) is also provided with a first flow hole (22), and the first flow hole (22) is communicated with the second end of the throttling groove (21); The valve core assembly (3) comprises a rotatable throttling ring (31), the bottom surface of the throttling ring (31) abuts against the top surface of the valve seat (2); the throttling ring (31) is provided with a second flow hole (311), and when the throttling ring (31) rotates, the second flow hole (311) rotates between a first position and a second position; when the second flow hole (311) is located at the first position, the second flow hole (311) does not overlap with the throttling groove (21) and the first flow hole (22); when the second flow hole (311) rotates from the first position to the second position, the second flow hole (311) partially overlaps with the throttling groove (21) and the first flow hole (22) and then completely overlaps.

2. The rotary valve core micro-flow regulating valve according to claim 1, characterized in that: The center line of the throttling groove (21) is in the shape of an arc, and the axes of the first through-flow hole (22) and the second through-flow hole (311) are both located on the center line of the throttling groove (21).

3. The rotary valve core micro-flow regulating valve according to claim 1, characterized in that: The diameter of the second through-flow hole (311) is greater than the diameter of the first through-flow hole (22), and the diameter of the first through-flow hole (22) is greater than the width of the second end of the throttling groove (21).

4. The rotary valve core micro-flow regulating valve according to any one of claims 1 to 3, characterized in that: The valve body (1) is provided with a valve stem (4), the portion of the valve stem (4) located inside the valve body (1) is provided with an annular protrusion (41), and the bottom end of the valve stem (4) is connected to the top of the throttling ring (31); the valve core assembly (3) also includes a sleeve (32), the sleeve (32) is sleeved on the outer side of the throttling ring (31), and the side wall of the sleeve (32) is provided with a third flow hole (321); a gasket (33) is fixedly provided on the top of the sleeve (32), the gasket (33) is sleeved on the valve stem (4) and abuts against the bottom surface of the annular protrusion (41); a spring (34) is provided between the gasket (33) and the throttling ring (31).

5. The rotary valve core micro-flow regulating valve according to claim 4, characterized in that: The bottom end of the valve stem (4) is in the shape of a rectangular parallelepiped, and the top of the throttling ring (31) is provided with a through groove (312) with a rectangular cross section.

6. The rotary valve core micro-flow regulating valve according to claim 4, characterized in that: A retaining spring (35) is embedded in the inner wall of the sleeve ring (32), and the top of the gasket ring (33) abuts against the bottom surface of the retaining spring (35).

7. The rotary valve core micro-flow regulating valve according to claim 4, characterized in that: A valve cover (5) is fixedly provided on the top of the valve body (1), and the valve stem (4) is inserted into the valve cover (5); a sleeve (6) is provided between the valve cover (5) and the valve seat (2), and the sleeve (6) is provided on the outer periphery of the valve core assembly (3); the bottom of the sleeve (6) is connected to the valve seat (2) via a vertical pin shaft (61), and the top of the sleeve (6) is connected to the valve cover (5) via a transverse pin shaft (62); and a fourth flow hole (63) is provided on the side wall of the sleeve (6).

8. The rotary valve core micro-flow regulating valve according to claim 7, characterized in that: The bottom end of the valve cover (5) is provided with a shaft sleeve (51), and the valve stem (4) is inserted into the shaft sleeve (51).

9. The rotary valve core micro-flow regulating valve according to any one of claims 1 to 3, characterized in that: The number of the second through-flow holes (311) is two, and they are symmetrically arranged around the center of the throttling ring (31).

10. The rotary valve core micro-flow regulating valve according to any one of claims 1 to 3, characterized in that: The angle between the first position, the second position and the center of the throttle ring (31) is 90 degrees.

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