Flow control valve

Abstract

The present invention provides a flow regulating valve, comprising: a valve core assembly, a driving mechanism and a return spring, the valve core assembly comprising a valve sleeve and a core shaft, the valve sleeve is a sleeve-shaped structure, having an open end and a closed end relative to each other, and a side wall of the valve sleeve is provided with a fluid inlet connected from the outside to the inner cavity; the core shaft is a rod-shaped structure, comprising a first rod portion, a reducing portion and a second rod portion connected in sequence, the end of the first rod portion can be inserted into the open end of the valve sleeve and then passed out to the outside of the valve sleeve, the radial dimension of the reducing portion gradually increases from the end connected to the first rod portion to the end connected to the second rod portion, and the radial dimension of the second rod portion is smaller than the maximum radial dimension of the reducing portion; the first rod portion of the core shaft is inserted into the valve sleeve through the open end of the valve sleeve and faces the movable shaft, and under the action of the driving mechanism and the return spring, the core shaft can be driven to move along the axis relative to the valve sleeve, driving the reducing portion to move at the open end of the valve sleeve, thereby changing the opening area of ​​the open end.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and in particular to a flow regulating valve. Background Art

[0002] In medical devices such as spirometers and ventilators, ventilation is usually required through pipelines. In order to adjust the ventilation flow, a flow regulating valve needs to be installed in the pipeline.

[0003] The flow control valve provided by the prior art usually adopts an electromagnet to drive the switch. Since the output torque of the electromagnet is unstable and the torque decreases as the output distance increases, the flow control fluctuation is large. Summary of the Invention

[0004] Based on this, the present invention provides a motor-driven flow control valve for solving the problems of large flow control fluctuations and large errors.

[0005] An object of the present invention is to provide a flow control valve, comprising:

[0006] The valve core assembly includes a valve sleeve and a core shaft, wherein the valve sleeve is a sleeve-shaped structure having an open end and a closed end opposite to each other, the closed end being provided with a mounting hole penetrating the inner cavity, and the side wall of the valve sleeve being provided with at least one first fluid inlet communicating from the outside to the inner cavity; the core shaft is a rod-shaped structure including a first rod portion, a reducing portion, and a second rod portion connected in sequence, the distal end of the first rod portion being able to pass through the open end of the valve sleeve and being able to pass through the mounting hole to the outside of the valve sleeve, the reducing portion gradually increasing in radial dimension from an end connected to the first rod portion to an end connected to the second rod portion, and having a maximum radial dimension greater than a radial dimension of the open end of the valve sleeve, and a radial dimension of the second rod portion being smaller than a maximum radial dimension of the reducing portion;

[0007] A driving mechanism including a mover shaft;

[0008] A return spring, one end of which is sleeved on the second rod portion and abuts against the end wall of the diameter-reducing portion; and the other end is fixed and abuts against the end wall;

[0009] The first rod portion of the core shaft is inserted into the valve sleeve through the open end of the valve sleeve and faces the mover shaft. Under the action of the driving mechanism and the return spring, the core shaft can be driven to move along the axis relative to the valve sleeve, thereby driving the reducing portion to move at the open end of the valve sleeve, thereby changing the opening area of ​​the open end;

[0010] The valve core assembly also includes a first core sleeve, which has a ring-shaped structure. Its inner cavity structure cooperates with the outer structure of the first rod portion and is used to be sleeved on the outside of the first rod portion; its outer wall structure cooperates with the structure of the inner cavity of the valve sleeve. When the core shaft is inserted into the valve sleeve, the first core sleeve is located between the closed end of the valve sleeve and the axial position of the first fluid inlet.

[0011] Furthermore, the driving mechanism is a voice coil motor.

[0012] Furthermore, the first core sleeve is made of plastic, rubber or metal.

[0013] Furthermore, a first groove is provided on the outer wall of the first core sleeve, a first sealing ring is provided in the first groove, and the first sealing ring is made of fluororubber, silicone rubber, polyurethane rubber, or hydrogenated nitrile rubber.

[0014] Furthermore, the valve core assembly also includes a second core sleeve having a ring-shaped structure, the second core sleeve is made of fluororubber, silicone rubber, polyurethane rubber, or hydrogenated nitrile rubber, and its internal structure is coordinated with the external structure of the reducing part. After the second core sleeve is sleeved on the outer wall of the reducing part, the assembly of the reducing part and the second core sleeve has a conical structure, and the radial dimension of the conical structure gradually increases from the end connected to the first rod to the end connected to the second rod.

[0015] Furthermore, the end wall of the opening end of the valve sleeve has an inwardly contracted conical structure.

[0016] Furthermore, the flow regulating valve also includes a valve seat, which is used to fix / install the valve core assembly, the driving mechanism and the return spring. The valve seat is provided with an installation cavity for accommodating the valve core assembly, and a second fluid inlet is provided on its side wall to penetrate into the installation cavity. When the valve core assembly is fixed in the installation cavity, the second fluid inlet is connected to the first fluid inlet; the valve seat also includes a fixed wall, which is provided with a fixing hole that penetrates into the installation cavity. The movable shaft of the driving mechanism is arranged in the fixing hole and faces the end of the first rod portion; the return spring is in contact with the valve seat at the opposite end of the core shaft.

[0017] Furthermore, when the valve core assembly is arranged in the installation cavity, a second sealing ring and a third sealing ring are provided between the outer wall of the valve sleeve and the inner wall of the installation cavity, and the second sealing ring and the third sealing ring are respectively located on both sides of the axial position of the first fluid inlet and the second fluid inlet.

[0018] Furthermore, the valve seat is also provided with a groove connected to the outside, and a baffle is provided in the groove. When the valve core assembly is arranged in the installation cavity, the outlet end of the valve sleeve is connected to the groove of the valve seat for fluid outflow; the opposite end of the return spring that contacts one end of the core shaft is located in the groove and contacts the baffle.

[0019] Furthermore, the flow regulating valve further includes a filter assembly, which is arranged at the opening of the slot and is used to purify and filter the fluid flowing out of the inner cavity of the valve seat.

[0020] The flow regulating valve provided by the present invention has a simple structure, realizes linear flow regulation through a voice coil motor and a return spring, and can achieve real-time linear control of the flow regulating valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a cross-sectional view of the flow control valve along the central axis in the first embodiment.

[0022] Figure 2 It is a cross-sectional view of the valve core assembly along the axial direction in the first embodiment.

[0023] Figure 3 1 is a cross-sectional view of the valve sleeve along the axial direction in the first embodiment.

[0024] Figure 4 It is a cross-sectional view of the core shaft along the axis in the first embodiment.

[0025] Figure 5 A schematic cross-sectional view of the flow rate regulating device in the first embodiment when assembled along the axial direction.

[0026] Figure 6 It is a cross-sectional view along the axial direction during the opening process of the flow control valve in the first embodiment.

[0027] Figure 7 It is a cross-sectional view of the valve core assembly along the axial direction during the opening process of the flow control valve in the first embodiment. DETAILED DESCRIPTION

[0028] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. Preferred embodiments of the present invention are shown in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present invention.

[0029] In this specification, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention belongs. The terms used herein are for the purpose of describing specific embodiments only and are not intended to limit the present invention. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention belongs. The terms used herein are for the purpose of describing specific embodiments only and are not intended to limit the present invention.

[0030] like Figure 1 As shown, a first embodiment of the present invention provides a flow control valve, including a valve seat 10 , a valve core assembly 20 , a driving mechanism 30 , a return spring 40 and a filter assembly 50 .

[0031] Among them, the valve seat 10 is used to install / fix the valve core assembly 20, the drive mechanism 30, the return spring 40 and the filter assembly 50, so that the flow control valve is assembled into a fixed modular structure, which facilitates the assembly and use of the flow control valve in instruments such as medical devices.

[0032] refer to Figures 2 to 4 The valve core assembly 20 is the main structure of the flow control valve, including a valve sleeve 21 and a core shaft 22. The valve sleeve 21 is a sleeve-shaped structure with an open end 21a and a closed end 21b opposite to each other. The closed end 21b is provided with a mounting hole 211 that penetrates the inner cavity. The side wall of the valve sleeve 21 is provided with at least one first fluid inlet 212 that communicates from the outside to the inner cavity; the core shaft 22 is a rod-shaped structure, including a first rod portion 221, a reducing portion 222 and a second rod portion 223 that are connected in sequence. The end of the first rod portion 221 can penetrate from the open end of the valve sleeve 21 and can pass through the mounting hole 211. The hole 211 extends outward from the valve sleeve 21. The radial dimension of the reducing portion 222 gradually increases from the end connected to the first rod portion 221 to the end connected to the second rod portion 221. The maximum radial dimension is greater than the radial dimension of the open end 21a of the valve sleeve 21. The radial dimension of the second rod portion 223 is smaller than the maximum radial dimension of the reducing portion 222. The first rod portion 221 of the core shaft 22 is inserted into the valve sleeve 21 through the open end of the valve sleeve 21. The reducing portion 222 can move at the open end 21a of the valve sleeve 21, thereby changing the opening area at the open end 21a. The valve core assembly 20 designed in this scheme is used to adjust the flow rate of the fluid. During use, the fluid flows in through the first fluid inlet 212 and then flows out through the opening at the outlet end 21a. By changing the opening area at the open end 21a, the flow rate can be adjusted.

[0033] Furthermore, the valve core assembly 20 also includes a first core sleeve 23, which has a sleeve-like structure and is made of materials such as plastic, rubber, and metal. Its inner cavity structure matches the outer structure of the first rod portion 221 and is used to be sleeved on the outside of the first rod portion 221. Its outer wall structure matches the structure of the inner cavity of the valve sleeve 21. When the core shaft 22 is inserted into the valve sleeve 21, the first core sleeve 23 is located between the closed end 21b of the valve sleeve and the axial position of the first fluid inlet 212. By providing the first core sleeve 23, it can seal and support the closed end 21b of the valve sleeve 21, preventing the fluid flowing in from the first fluid inlet 212 from flowing out from the mounting hole 211, thereby causing fluid leakage and affecting the use effect of the flow control valve; at the same time, it supports the core shaft 22, preventing the core shaft from moving radially and affecting the flow control effect.

[0034] Furthermore, a first groove (not shown) is formed on the outer wall of the first core sleeve 23, within which is located a first sealing ring 24. The first sealing ring is made of fluororubber, silicone rubber, polyurethane rubber, or hydrogenated nitrile rubber. This arrangement of the first sealing ring on the outer wall of the first core sleeve 23 provides a good seal against the closed end of the valve sleeve 21 while preventing excessive friction from hindering the movement of the core shaft 22 within the valve sleeve 21.

[0035] Furthermore, the first sealing ring 24 is a lip-shaped sealing ring.

[0036] Furthermore, the valve core assembly 20 also includes a second core sleeve 25 having a ring-shaped structure. The second core sleeve 25 is made of fluororubber, silicone rubber, polyurethane rubber, or hydrogenated nitrile rubber. Its internal structure matches the external structure of the reducing portion 222. After the second core sleeve 25 is sleeved on the outer wall of the reducing portion 222, the assembly of the reducing portion 222 and the second core sleeve 25 has a tapered structure, the radial dimension of which gradually increases from the end connected to the first rod portion 221 to the end connected to the second rod portion 223. By providing the second core sleeve 25, this solution can form a good seal with the open end 21a of the valve sleeve 21 when the flow control valve 1 is closed, thereby ensuring that the flow control valve 1 has good airtightness and reliable use.

[0037] Furthermore, the end wall 215 of the open end 21a of the valve sleeve 21 has an inwardly contracting tapered structure, with its inner diameter gradually increasing from the inside out. This solution allows the valve sleeve 21 and the second core sleeve 25 to have a better sealing effect when the flow control valve is closed, further enhancing the reliability of the flow control valve.

[0038] In this embodiment, in order to simplify installation, the first core sleeve 23 and the second core sleeve 25 can be connected and fixed by a connecting piece 26.

[0039] Specifically, the connector 26 is a sleeve-shaped structure sleeved on the first rod portion, and its radial dimension is smaller than that of the first core sleeve 23, so that the fluid can flow between the inner cavity of the valve sleeve 21 and the outer wall of the connector 26. This solution can protect the core shaft and prevent the core shaft from being corroded by the fluid.

[0040] The first core sleeve 23, the second core sleeve 25 and the connector 26 can be integrally injection molded using the same material, or can be injection molded in steps using different materials and then connected by bonding or the like.

[0041] It should be noted that there are multiple possible structures for the closed end. For example, in this embodiment, an end wall is formed directly during the molding process of the valve sleeve 21, and then a mounting hole 211 is opened on the end wall to form a closed end. Alternatively, a valve sleeve having a tubular structure can be first molded, and then an end cover structure can be molded, and the end cover structure can be fixed to the valve sleeve to form a closed end. Alternatively, the valve sleeve can be directly configured as a tubular structure, and the closed end can be sealed by the first core sleeve / first core sleeve and the first sealing ring. Among them, configuring the valve sleeve 21 as a sleeve-shaped structure with one end closed and providing a mounting hole on its closed end can support the core shaft passing through the valve sleeve, and has a better technical effect.

[0042] The present invention can drive the core shaft 22 in the valve core assembly 20 to move axially relative to the valve sleeve 21 through various methods. Figure 1 、 Figure 5 In this embodiment, the core shaft 22 is driven to move axially by the driving mechanism 30.

[0043] Specifically, the drive mechanism 30 is a hysteresis-free linear voice coil motor, including a mover shaft 31. When the drive mechanism 30 is fixedly connected to the valve seat 10, the mover shaft 31 faces the end of the first rod 221. When the drive mechanism 30 is energized, the mover shaft 31 drives the core shaft 22 axially. The voice coil motor configuration enables linear torque output, thereby ensuring stable flow control.

[0044] To reset the core shaft 22 in the valve core assembly 20, the present invention further provides a return spring 40 within the valve seat 10. After one end of the return spring 40 is sleeved onto the second rod portion 223, its distal end abuts against the end wall of the reducing portion 222, while its other end abuts against the valve seat 10. The driving force of the drive mechanism 30 and the resisting force of the return spring 40 work together to control the axial movement of the core shaft 22. When the drive mechanism 30 is closed or its power is reduced, the core shaft 22 gradually returns to its original position under the elastic force of the return spring 40, thereby reducing the flow rate or completely closing the flow control valve.

[0045] Furthermore, the flow control valve provided in this embodiment further includes a filter assembly 50 , which is disposed in the valve seat 10 and filters the fluid flowing out of the outlet end 21 a of the valve sleeve 21 .

[0046] There are many ways to structure the valve seat 10 and how the components are installed in the valve seat 10 or how they are connected to the valve seat 10 .

[0047] In this embodiment, the valve seat 10 is provided with a mounting cavity 11 for accommodating the valve core assembly 20, and a second fluid inlet 12 is provided on its side wall to penetrate into the mounting cavity 11. When the valve core assembly 20 is fixed in the mounting cavity 11, Figure 1 The second fluid inlet 12 is connected to the first fluid inlet 212 and serves as a fluid inflow channel.

[0048] In order to prevent the fluid flowing in from the second fluid inlet 12 from leaking when entering the first fluid inlet 212, when the valve core assembly is arranged in the installation cavity 11, a sealing structure can be provided between the outer wall of the valve sleeve 21 and the inner wall of the installation cavity 11. Figure 3 In this embodiment, the outer wall of the valve sleeve 21 is provided with a first receiving groove 213 and a second receiving groove 214. A second sealing ring is located in the first receiving groove 213, and a third sealing ring is located in the second receiving groove 214. When the valve sleeve 21 is installed in the mounting cavity 11, the first receiving groove 213 and the second receiving groove 214 are located on opposite axial sides of the first fluid inlet 212 and the second fluid inlet 12, respectively. This solution effectively prevents fluid leakage and further ensures the reliability of the fluid regulating valve.

[0049] Alternatively, the first receiving groove and the second receiving groove may be arranged in a ring on the side wall of the installation cavity.

[0050] Furthermore, the valve seat 10 also includes a fixed wall 13 having a fixing hole (not shown) extending through the mounting cavity 11. The movable shaft 31 of the drive mechanism 30 passes through the fixing hole and faces the end of the first rod portion 221. Furthermore, the drive mechanism 30 can be mounted and fixed to the fixed wall 13.

[0051] refer to Figure 5 The valve seat 10 is also provided with a groove 14 connected to the outside, and a stop cover 15 is provided in the groove 14. When the valve core assembly 20 is arranged in the installation cavity 11, the outlet end 21a of the valve sleeve 21 is connected to the groove 14 of the valve seat 10 for fluid outflow; one end of the return spring 50 is sleeved on the second rod portion 223 and abuts against the end wall of the reducing portion 222, and the other end extends into the groove 14 and abuts against the stop cover 15.

[0052] Furthermore, the filter assembly 50 is provided at the outlet of the slot 14 for purifying and filtering the fluid flowing out of the inner cavity of the valve seat 10. The filter assembly includes a mounting seat 51 and a filter element disposed within the mounting seat 51. The mounting seat 51 is used to cover the outlet of the slot 14.

[0053] To facilitate installation of the various components within the valve seat, the valve seat 10 preferably comprises a hollow sleeve structure, with the mounting cavity 11 and the slot 14 extending sequentially through the inner cavity of the valve seat. The fixed wall 13 is a removable end wall structure for providing the mounting cavity 11 from one end. This solution simplifies installation of the valve core assembly 20 within the valve seat 10.

[0054] Regarding the working principle of the flow control valve provided by the present invention, refer to Figure 1 、 Figure 2 When the driving mechanism 30 is not turned on, under the action of the resistance force of the return spring 40, the second core sleeve 25 wrapped on the outer wall of the reducing portion 222 is tightly fitted on the side wall of the opening end 21a of the valve sleeve 21, and the fluid cannot flow out of the valve sleeve 21; Figure 6 、 Figure 7 When the driving mechanism 30 is turned on and the power of the driving mechanism 30 is adjusted so that it is greater than the resistance force of the return spring 40, the core shaft gradually moves axially relative to the valve sleeve 21, and the reducing portion 222 moves to form a gap 20a between the open end 21a of the valve sleeve 21 and the second core sleeve 25, and the fluid can flow out from the open end; by adjusting the driving power of the driving mechanism 30, real-time linear control of the flow control valve can be achieved.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A flow control valve, characterized in that: include: The valve core assembly includes a valve sleeve and a core shaft, wherein the valve sleeve is a sleeve-shaped structure having an open end and a closed end opposite to each other, the closed end being provided with a mounting hole penetrating the inner cavity, and the side wall of the valve sleeve being provided with at least one first fluid inlet communicating from the outside to the inner cavity; the core shaft is a rod-shaped structure including a first rod portion, a reducing portion, and a second rod portion connected in sequence, the distal end of the first rod portion being able to pass through the open end of the valve sleeve and being able to pass through the mounting hole to the outside of the valve sleeve, the reducing portion gradually increasing in radial dimension from an end connected to the first rod portion to an end connected to the second rod portion, and having a maximum radial dimension greater than a radial dimension of the open end of the valve sleeve, and a radial dimension of the second rod portion being smaller than a maximum radial dimension of the reducing portion; A driving mechanism including a mover shaft; A return spring, one end of which is sleeved on the second rod portion and abuts against the end wall of the diameter-reducing portion; and the other end is fixed and abuts against the end wall; The first rod portion of the core shaft is inserted into the valve sleeve through the open end of the valve sleeve and faces the mover shaft. Under the action of the driving mechanism and the return spring, the core shaft can be driven to move along the axis relative to the valve sleeve, thereby driving the reducing portion to move at the open end of the valve sleeve, thereby changing the opening area of ​​the open end; The valve core assembly also includes a first core sleeve, which has a ring-shaped structure. Its inner cavity structure cooperates with the outer structure of the first rod portion and is used to be sleeved on the outside of the first rod portion; its outer wall structure cooperates with the structure of the inner cavity of the valve sleeve. When the core shaft is inserted into the valve sleeve, the first core sleeve is located between the closed end of the valve sleeve and the axial position of the first fluid inlet.

2. The flow control valve according to claim 1, characterized in that: The driving mechanism is a voice coil motor.

3. The flow control valve according to claim 1, characterized in that: The first core sleeve is made of plastic, rubber or metal.

4. The flow control valve according to claim 3, characterized in that: A first groove is arranged on the outer wall of the first core sleeve, a first sealing ring is arranged in the first groove, and the first sealing ring is made of fluororubber, silicone rubber, polyurethane rubber or hydrogenated nitrile rubber.

5. The flow control valve according to claim 4, characterized in that: The valve core assembly also includes a second core sleeve with a ring-shaped structure. The second core sleeve is made of fluororubber, silicone rubber, polyurethane rubber, or hydrogenated nitrile rubber. Its internal structure matches the external structure of the reducing part. After the second core sleeve is sleeved on the outer wall of the reducing part, the assembly of the reducing part and the second core sleeve has a conical structure, and the radial dimension of the conical structure gradually increases from the end connected to the first rod to the end connected to the second rod.

6. The flow control valve according to claim 1, characterized in that: The end wall of the opening end of the valve sleeve has an inwardly contracted tapered structure.

7. The flow control valve according to claim 1, characterized in that: The flow regulating valve also includes a valve seat, which is used to fix / install the valve core assembly, the driving mechanism and the reset spring. The valve seat is provided with an installation cavity for accommodating the valve core assembly, and a second fluid inlet is provided on its side wall, which penetrates into the installation cavity. When the valve core assembly is fixed in the installation cavity, the second fluid inlet is connected to the first fluid inlet; the valve seat also includes a fixed wall, which is provided with a fixing hole that penetrates into the installation cavity. The movable shaft of the driving mechanism is arranged in the fixing hole and faces the end of the first rod portion; the reset spring is in contact with the valve seat at the opposite end of the core shaft.

8. The flow control valve according to claim 7, characterized in that: When the valve core assembly is arranged in the installation cavity, a second sealing ring and a third sealing ring are provided between the outer wall of the valve sleeve and the inner wall of the installation cavity. The second sealing ring and the third sealing ring are respectively located on both sides of the axial position of the first fluid inlet and the second fluid inlet.

9. The flow control valve according to claim 8, characterized in that: The valve seat is also provided with a groove connected to the outside, and a baffle is provided in the groove. When the valve core assembly is arranged in the installation cavity, the outlet end of the valve sleeve is connected to the groove of the valve seat for fluid outflow; the opposite end of the return spring that contacts one end of the core shaft is located in the groove and contacts the baffle.

10. The flow control valve according to claim 9, characterized in that: The flow regulating valve further comprises a filter assembly, which is arranged at the opening of the slot and is used for purifying and filtering the fluid flowing out of the inner cavity of the valve seat.

Images