Control valve

Abstract

The invention relates to the field of fluid regulation, in particular to a control valve meeting flow regulation under special working conditions, which is characterized in that at least part of a valve core body part extends along the axis direction of a valve hole, at least part of a first matching part extends from the valve core body part along the radial direction of the valve hole, and a first limiting part is connected with a wall part corresponding to the valve hole; when the first limiting part abuts against the first matching part, the control valve is provided with a communication channel, the flow of the communication channel is the minimum flow of the control valve, and the minimum flow is larger than 0, that is, when the valve element part moves to the position where the first matching part abuts against the first limiting part, the first limiting part limits the valve element part, and the valve element part cannot continue to move in the same direction; the control valve is provided with a communicating channel, and the flow of the communicating channel is the minimum flow of the control valve, that is, when the first limiting part abuts against the first matching part, the communicating channel can be used for small flow adjustment needed under the special working condition.

Description

Technical Field

[0001] The present invention relates to the field of fluid regulation, and particularly to a control valve.

Background Art

[0002] The control valve includes a driving part, a lead screw, a nut and a valve core. The driving part drives the lead screw to rotate. The lead screw and the nut are in threaded cooperation. While the lead screw rotates around its own axis, the lead screw moves along the axis corresponding to the lead screw. The lead screw and the valve core are limitedly arranged, and the lead screw drives the valve core to move along the axis of the lead screw. In some working conditions, the required flow rate is small. During the process of the control valve moving from the closed state to the open state, the pulse tolerance corresponding to the driving part is large, and it cannot meet the required small flow rate regulation in some working conditions.

Summary of the Invention

[0003] The present invention provides a control valve to solve the above problems:

[0004] A control valve, which includes a valve cavity. The control valve includes a valve body part and a valve core part. The valve core part is located in the valve cavity. The valve core part includes a valve core body part and a first matching part. The valve body part includes a valve hole part. The valve hole part includes a valve hole. At least part of the valve core body part extends along the axis direction of the valve hole. At least part of the first matching part extends radially from the valve core body part along the valve hole. The valve body part includes a first limiting part. The first limiting part is connected to the wall part corresponding to the valve hole. When the first limiting part abuts against the first matching part, the control valve has a communication channel. The flow rate of the communication channel is the minimum flow rate of the control valve, and the minimum flow rate > 0.

[0005] For such a control valve, at least part of the valve core body part extends along the axis direction of the valve hole, at least part of the first matching part extends radially from the valve core body part along the valve hole, the first limiting part is connected to the wall part corresponding to the valve hole, and when the first limiting part abuts against the first matching part, the control valve has a communication channel. The flow rate of the communication channel is the minimum flow rate of the control valve, and the minimum flow rate > 0. That is, when the valve core part moves to the position where the first matching part abuts against the first limiting part, the first limiting part limits the valve core part, and the valve core part cannot continue to move in the same direction. At this time, the control valve has a communication channel, and the flow rate of the communication channel is the minimum flow rate of the control valve, and the minimum flow rate > 0. That is, when the first limiting part abuts against the first matching part, the communication channel can be used for the small flow rate regulation required in special working conditions.

Description of the Drawings

[0006] Figure 1 、 Figure 6 、 Figure 11 、 Figure 15 and Figure 19 are cross-sectional views of different embodiments of the control valve when the valve core part is in the first position;

[0007] Figure 2 、 Figure 7, Figure 12 , Figure 16 , Figure 20 are enlarged views of area A under different embodiments;

[0008] Figure 3 , Figure 4 , Figure 8 , Figure 21 are schematic views of the valve core part under different embodiments;

[0009] Figure 5 , Figure 9 , Figure 10 , Figure 13 , Figure 14 , Figure 17 and Figure 18 are axonometric views corresponding to the A-A section of the valve body part under different embodiments.

[0010] Reference signs:

[0011] valve cavity 1, inlet cavity 11, outlet cavity 12,

[0012] valve core part 2, first mating part 21, second platform 211, valve core body part 22,

[0013] valve body part 3, first limiting part 33, first platform 331, first recessed part 332, second recessed part 333, first end part 334, second end part 335, valve hole part 34, valve hole 341,

[0014] first embedding part 4, second embedding part 40,

[0015] driving part 5, nut 6, lead screw 7,

[0016] first position 001; first direction 002; communication channel 003, first notch part 004, second notch part 005, conduction channel 007, first hole 006, first section 0061, second section 0062.

Detailed implementation manners

[0017] The technical solutions of the detailed implementation manners will be described below with reference to the accompanying drawings:

[0018] Referring to Figures 1 - 21 , the control valve includes a driving part 5, a lead screw 7, a nut 6, a valve core part 2 and a valve body part 3. The control valve includes a valve cavity 1. At least part of the driving part 5, the lead screw 7, the nut 6 and the valve core part 2 are located in the valve cavity 1. The driving part 5 drives the lead screw 7 to rotate. The lead screw 7 and the nut 6 are in threaded cooperation. The nut 6 and the valve body part 3 are fixedly arranged. While the lead screw 7 rotates around its corresponding axis, the lead screw 7 moves linearly along its corresponding axis. The lead screw 7 and the valve core part 2 are limitedly arranged, and the valve core part 2 moves along the axis direction corresponding to the lead screw.

[0019] Define the position of the spool part 2 corresponding to the minimum flow rate of the control valve as the first position 001; define the moving direction of the spool part 2 during the process of increasing the opening of the control valve as the first direction 002; during the process of the spool part 2 moving in the opposite direction of the first direction 002, the flow rate of the control valve gradually decreases.

[0020] The spool part 2 includes a spool body part 22 and a first fitting part 21. The valve body part 3 includes a valve hole part 34. The valve hole part 34 includes a valve hole 341. At least part of the spool body part 22 extends along the axial direction of the valve hole 341. At least part of the first fitting part 21 extends radially from the spool body part 22 along the valve hole 341. The valve body part 3 includes a first limiting part 33. The first limiting part 33 is connected to the corresponding wall part of the valve hole 341. When the first limiting part 33 abuts against the first fitting part 21, the control valve has a communication channel 003. The flow rate of the communication channel 003 is the minimum flow rate of the control valve, and the minimum flow rate > 0.

[0021] For such a control valve, by at least part of the spool body part 22 extending along the axial direction of the valve hole 341, at least part of the first fitting part 21 extending radially from the spool body part 22 along the valve hole 341, the first limiting part 33 being connected to the corresponding wall part of the valve hole 341, when the first limiting part 33 abuts against the first fitting part 21, the control valve has a communication channel 003, and the flow rate of the communication channel 003 is the minimum flow rate of the control valve, and the minimum flow rate > 0, that is, during the process of the spool part 2 moving in the opposite direction of the first direction 002, the flow rate of the control valve gradually decreases. When the spool part 2 moves to the first position 001 in the opposite direction of the first direction 002, the first fitting part 21 abuts against the first limiting part 33, and the first limiting part 33 limits the spool part 2, and the spool part 2 cannot continue to move in the opposite direction of the first direction 002. At this time, the control valve has a communication channel 003, and the flow rate of the communication channel 003 is the minimum flow rate of the control valve, and the minimum flow rate > 0, that is, when the first limiting part 33 abuts against the first fitting part 21, a relatively small flow rate adjustment required under special working conditions for the communication channel 003.

[0022] It should be noted that: the spool body part 22 and the first fitting part 21 are limitedly arranged or fixedly arranged or of an integral structure; the valve hole 341 can be a straight hole along the corresponding axial direction of the valve hole 341, or a hole with a changing aperture along the axial direction of the valve hole. Specifically, the valve hole can be a stepped hole; "the first limiting part 33 is connected to the corresponding wall part of the valve hole 341" can be understood as that the first limiting part and the valve hole part can be of an integral structure or a split structure.

[0023] Of course, in different embodiments, the communication channel 003 can be located at different positions, and the corresponding wall part of the communication channel 003 can have different structures.

[0024] In one embodiment, refer to Figures 1 - 10When the first limiting portion 33 and the first mating portion 21 are in contact, the communication channel 003 is located between the first limiting portion 33 and the first mating portion 21. The valve cavity 1 includes an inlet cavity 11 and an outlet cavity 12, and the communication channel 003 conducts the inlet cavity 11 and the valve hole 341. Specifically, the first limiting portion 33 is circumferentially arranged around the axis corresponding to the valve hole 341, and the first mating portion 21 is circumferentially arranged around the axis corresponding to the valve core body portion 22. When the valve core portion 2 is in the first position 001, the first limiting portion 33 and the first mating portion 21 are in contact. When the first limiting portion 33 and the first mating portion 21 are in contact, a partial seal between the inlet cavity 11 and the outlet cavity 12 is achieved between the first limiting portion 33 and the first mating portion 21.

[0025] More specifically, the first limiting portion 33 has a first platform 331 facing the first direction 002. The first limiting portion 33 is circumferentially arranged around the axis corresponding to the valve hole 341, that is, the first limiting portion 33 is in a ring shape or approximately in a ring shape, and the inner edge of the first limiting portion 33 is connected to the valve hole wall portion corresponding to the valve hole 341. The first mating portion 21 has a second platform 211 arranged opposite to the first platform 331. The first mating portion 21 is circumferentially arranged around the axis corresponding to the valve core body portion 22, that is, the first mating portion 21 is in a ring shape or approximately in a ring shape. When the first limiting portion 33 and the first mating portion 21 are in contact, the first platform and the second platform are in contact, thereby achieving a seal between the inlet cavity 11 and the outlet cavity 12 between the first platform 331 and the second platform 211, and achieving a partial seal between the first limiting portion 33 and the first mating portion 21.

[0026] When the valve core portion 2 is in the first position 001, the first limiting portion 33 and the first mating portion 21 are in contact. When the first limiting portion 33 and the first mating portion 21 are in contact, the communication channel 003 is located between the first limiting portion 33 and the first mating portion 21, achieving flow regulation of the control valve. Specifically, one of the first limiting portion 33 and the first mating portion 21 has a first notch portion 004. When the first mating portion 21 and the first limiting portion 33 are in contact, the cavity corresponding to the other of the first limiting portion 33 and the first mating portion 21 and the first notch portion 004 is the communication channel 003. The communication channel 003 conducts the inlet cavity 11 and the valve hole 341, realizing a smaller flow regulation required for the control valve under special working conditions.

[0027] More specifically, refer to Figures 6 - 10, the first notch 004 can be recessed from the first platform 331 in the opposite direction of the first direction 002. The first notch 004 can extend radially along the valve hole 341. Specifically, the first platform is an incomplete ring, and the second platform is a complete ring. When the valve core part 2 is in the first position 001, the first limiting part 33 and the first mating part 21 are in contact. When the first limiting part 33 and the first mating part 21 are in contact, the cavity between the first notch 004 and the second platform 211 is the communication channel 003. The communication channel 003 conducts the inlet cavity 11 and the valve hole 341 to achieve the flow regulation required by the control valve; or, refer to Figures 1 - 5 , the first notch 004 can be recessed from the second platform 211 in the first direction 002. The first notch 004 can extend radially along the valve core body part 22. That is, the second platform is an incomplete ring, and the first platform is a complete ring. When the valve core part 2 is in the first position 001, the first limiting part 33 and the first mating part 21 are in contact. When the first limiting part 33 and the first mating part 21 are in contact, a communication channel 003 is formed between the first notch 004 and the first platform 331. The communication channel 003 conducts the inlet cavity 11 and the valve hole 341 to achieve the flow regulation required by the control valve.

[0028] Under special working conditions, the flow rate required by the control valve is small, and the depth dimension of the first notch 004 in its recessed direction is small. Specifically, the size of the first notch 004 recessed in its recessed direction can be ≥0.05 mm. If a groove is directly machined on a plane, the machining difficulty is relatively large.

[0029] One of the first limiting part 33 and the first mating part 21 has a first recess 332 and a first embedding part 4. The first embedding part 4 is embedded in the cavity corresponding to the first recess 332. The size of the first embedding part 4 in the recessed direction of the first recess 332 is smaller than the depth dimension of the first recess 332. The wall part corresponding to the first notch 004 includes at least part of the wall part corresponding to the first recess 332 and at least part of the wall part corresponding to the first embedding part 4.

[0030] For such a control valve, since the size of the first embedding part 4 in the recessed direction of the first recess 332 is smaller than the depth dimension of the first recess 332, and the wall part corresponding to the first notch 004 includes at least part of the wall part corresponding to the first recess 332 and at least part of the wall part corresponding to the first embedding part 4, that is, through the dimensional difference between the first embedding part 4 and the first recess 332, the first notch 004 is formed. By machining the first recess 332 and the first embedding part 4 separately, the machining accuracy is relatively high, which can meet the dimensional requirements and is convenient for machining.

[0031] Specifically, refer to Figures 6 - 10, the first limiting portion 33 has a first recessed portion 332 recessed in the opposite direction of the first direction 002. The first limiting portion 33 has a first inserting portion 4 inserted into the first recessed portion 332 in the opposite direction of the first direction 002. The depth dimension of the first recessed portion 332 recessed in the opposite direction of the first direction 002 is greater than the height dimension of the first inserting portion 4 in the opposite direction of the first direction 002. After welding the first inserting portion 4 and the first recessed portion 332, the first limiting portion 33 has a first notch portion 004; reference Figures 1 - 5 , or the first mating portion 21 has a first recessed portion 332 recessed in the first direction 002. The first mating portion 21 has a first inserting portion 4 inserted into the first recessed portion 332 in the first direction 002. The depth of the first recessed portion 332 recessed in the first direction 002 is greater than the height of the first inserting portion 4 in the first direction 002. After welding the first inserting portion 4 and the first recessed portion 332, the first mating portion 21 has a first notch portion 004. Thus, in combination with the circumferential length of the first notch portion 004 along the valve hole 341, small flow rate regulation required for the control valve can be achieved. Specifically, the throttling area > 0 mm 2 , ≤ 0.2 mm 2 .

[0032] In one embodiment, reference Figures 11 - 14 and Figure 3 and Figure 4 , the first limiting portion 33 and the first mating portion 21 are in contact. The communication channel 003 is located between the first limiting portion 33 and the first mating portion 21. The valve cavity 1 includes an inlet cavity 11 and an outlet cavity 12. The communication channel 003 conducts the inlet cavity 11 and the valve hole 341; specifically, the first limiting portion 33 is circumferentially arranged around the axis corresponding to the valve hole 341. The first mating portion 21 is circumferentially arranged around the axis corresponding to the valve core body portion 22. When the valve core portion 2 is in the first position 001, the first limiting portion 33 and the first mating portion 21 are in contact. When the first limiting portion 33 and the first mating portion 21 are in contact, local sealing between the first limiting portion 33 and the first mating portion 21 is achieved.

[0033] More specifically, the first limiting portion 33 has a first platform 331 facing the first direction 002. The first platform 331 is circumferentially arranged around the axis corresponding to the valve hole 341, that is, the first limiting portion is or is substantially annular, and the inner edge of the annular first limiting portion is connected to the valve hole wall portion corresponding to the valve hole 341. The first mating portion 21 has a second platform 211 arranged opposite to the first platform 331. The first mating portion is circumferentially arranged around the axis corresponding to the valve core body portion 22, that is, the first mating portion is or is substantially annular. When the first limiting portion 33 and the first mating portion 21 are in contact, the first platform and the second platform are in contact, thereby realizing the sealing between the inlet cavity 11 and the outlet cavity 12 between the first platform 331 and the second platform 211, and realizing the local sealing between the first limiting portion 33 and the first mating portion 21.

[0034] When the valve core part 2 is in the first position 001, the first limiting part 33 and the first matching part 21 are in contact. When the first limiting part 33 and the first matching part 21 are in contact, the communication channel 003 is located between the first limiting part 33 and the first matching part 21, realizing the flow regulation of the control valve. Specifically, the first matching part 21 has a first notch part 004, and the first limiting part 33 has a second notch part 005, that is, the first platform is an incomplete ring, and the second platform is an incomplete ring. When the first matching part 21 and the first limiting part 33 are in contact, the first notch part 004 and the second notch part 005 are arranged opposite to each other, and the cavity between the first notch part 004 and the second notch part 005 is the communication channel 003. The communication channel 003 conducts the inlet cavity 11 and the valve hole 341, realizing the smaller flow regulation required by the control valve under special working conditions.

[0035] More specifically, the first notch part 004 can be recessed from the second platform 211 along the first direction 002, the first notch part 004 can extend along the radial direction of the valve core body part 22, the second notch part 005 can be recessed from the first platform 331 along the opposite direction of the first direction 002, the second notch part 005 can extend along the radial direction of the valve hole 341, and the first notch part 004 and the second notch part 005 are arranged opposite to each other. When the valve core part 2 is in the first position 001, the first limiting part 33 and the first matching part 21 are in contact. When the first limiting part 33 and the first matching part 21 are in contact, the corresponding cavity between the first notch part 004 and the second notch part 005 is the communication channel 003. The communication channel 003 conducts the inlet cavity 11 and the valve hole 341, realizing the flow regulation required by the control valve.

[0036] Under special working conditions, the required flow of the control valve is small, and the depth dimensions of the first notch part 004 and the second notch part 005 along their recessed directions are small. Specifically, the size of the first notch part 004 recessed along its recessed direction can be ≥0.05 mm, and the size of the second notch part 005 recessed along its recessed direction can be ≥0.05 mm. If a groove is directly machined on the plane, the machining difficulty is relatively large.

[0037] The first mating portion 21 has a first recessed portion 332 and a first insertion portion 4. The first limiting portion 33 has a second recessed portion 333 and a second insertion portion 40. The first insertion portion 4 is inserted into the cavity corresponding to the first recessed portion 332, and the second insertion portion 40 is inserted into the cavity corresponding to the second recessed portion 333. The dimension of the first insertion portion 4 along the recessed direction of the first recessed portion 332 is smaller than the depth dimension of the first recessed portion 332. The dimension of the second insertion portion 40 along the recessed direction of the second recessed portion 333 is smaller than the depth dimension of the second recessed portion 333. The wall portion corresponding to the first notch portion 004 includes at least part of the wall portion corresponding to the first recessed portion 332 and at least part of the wall portion corresponding to the first insertion portion 4. The wall portion corresponding to the second notch portion 005 includes at least part of the wall portion corresponding to the second recessed portion 333 and at least part of the wall portion corresponding to the second insertion portion 40.

[0038] For such a control valve, since the dimension of the first insertion portion 4 along the recessed direction of the first recessed portion 332 is smaller than the depth dimension of the first recessed portion 332, and the dimension of the second insertion portion 40 along the recessed direction of the second recessed portion 333 is smaller than the depth dimension of the second recessed portion 333, and the wall portion corresponding to the first notch portion 004 includes at least part of the wall portion corresponding to the first recessed portion 332 and at least part of the wall portion corresponding to the first insertion portion 4, and the wall portion corresponding to the second notch portion 005 includes at least part of the wall portion corresponding to the second recessed portion 333 and at least part of the wall portion corresponding to the second insertion portion 40, that is, the first notch portion 004 is formed by the dimensional difference between the first insertion portion 4 and the first recessed portion 332, and the second notch portion 005 is formed by the dimensional difference between the second insertion portion 40 and the second recessed portion 333. The first recessed portion 332, the first insertion portion 4, the second recessed portion 333 and the second insertion portion 40 are processed separately, with relatively high machining accuracy, which can meet the dimensional requirements and is convenient for machining.

[0039] Specifically, the first engaging portion 21 has a first recessed portion 332 recessed along the first direction 002. The first engaging portion 21 has a first inserting portion 4 that inserts into the first recessed portion 332 along the first direction 002. The depth dimension of the first recessed portion 332 recessed along the first direction 002 is greater than the height dimension of the first inserting portion 4 along the first direction 002. After welding the first inserting portion 4 and the first recessed portion 332, the first engaging portion 21 has a first notch portion 004. The first limiting portion 33 has a second recessed portion 333 recessed along the opposite direction of the first direction 002. The first limiting portion 33 has a second inserting portion 40 that inserts into the second recessed portion 333 along the opposite direction of the first direction 002. The depth dimension of the second recessed portion 333 recessed along the opposite direction of the first direction 002 is greater than the height dimension of the second inserting portion 40 along the opposite direction of the first direction 002. After welding the second inserting portion 40 and the second recessed portion 333, the first limiting portion 33 has a second notch portion 005. Thus, in combination with the circumferential lengths of the first notch portion 004 and the second notch portion 005 along the valve hole 341, small flow rate regulation required for the control valve can be achieved. Specifically, the throttling area > 0 mm 2 , ≤ 0.2 mm 2 .

[0040] In one embodiment, referring to Figures 15 - 18 , when the first limiting portion 33 and the first engaging portion 21 are in contact, the communication channel 003 is located between the valve core body portion 22 and the valve hole wall portion corresponding to the valve hole 341. More specifically, at least a part of the valve core body portion 22 is located in the valve hole 341, and a gap is provided between the valve core body portion 22 and the valve hole wall portion corresponding to the valve hole 341. The gap between the valve core body portion 22 and the valve hole wall portion corresponding to the valve hole 341 is the communication channel 003. There is a conduction channel 007 between the first limiting portion 33 and the engaging portion. The conduction channel 007 conducts the inlet cavity 11 and the communication channel 003, and the communication channel 003 conducts the conduction channel 007 and the outlet cavity 12. That is, when the valve core portion 2 is in the first position 001, the first limiting portion 33 and the first engaging portion 21 are in contact. There is a conduction channel 007 between the first limiting portion 33 and the first engaging portion 21. The flow rate of the conduction channel 007 is greater than the flow rate of the communication channel 003. The communication channel 003 realizes the relatively small flow rate control required for the control valve.

[0041] Specifically, the first limiting portion 33 is located on the circumferential side of the axis corresponding to the valve hole 341. The first limiting portion 33 extends along the circumferential side of the axis corresponding to the valve hole 341. The first limiting portion 33 has a first end 334 and a second end 335 along the circumferential side of the axis corresponding to the valve hole 341. There is a gap between the first end 334 and the second end 335. When the first limiting portion 33 abuts against the first mating portion 21, a conduction channel 007 is formed among the first end 334, the second end 335 and the first mating portion 21, and the conduction channel 007 conducts the intake cavity 11 and the communication channel 003; or the first limiting portion 33 is located on the circumferential side of the axis corresponding to the valve hole 341. The first limiting portion 33 extends along the circumferential side of the axis corresponding to the valve hole 341. The number of the first limiting portions 33 is at least two, and the first limiting portions 33 are circumferentially distributed along the axis corresponding to the valve hole 341. There is a gap between adjacent first limiting portions 33. When the first limiting portion 33 abuts against the first mating portion 21, conduction channels 007 are formed between adjacent first limiting portions 33 and the first mating portion 21, and the conduction channels 007 conduct the intake cavity 11 and the communication channel 003. The first mating portion 21 can also be arranged as an incomplete ring to form the conduction channel 007, which will not be elaborated here.

[0042] More specifically, the gap between the valve core body portion 22 and the valve hole wall portion corresponding to the valve hole 341 can be ≥0.05 mm, which can achieve the small flow regulation required by the control valve. Specifically, the throttling area > 0 mm 2 , ≤0.2 mm 2 .

[0043] In one embodiment, referring to Figures 19 - 21 and Figure 5 , the first mating portion 21 or the first limiting portion 33 has a first hole 006. The valve cavity 1 includes an intake cavity 11 and an outlet cavity 12. When the first mating portion 21 abuts against the first limiting portion 33, the gap between the valve core body portion 22 and the valve hole wall portion corresponding to the valve hole 341 is set. The first hole 006 conducts the intake cavity 11 and the valve hole 341, and the valve hole 341 and the outlet cavity 12 are conducted. At least part of the first hole 006 is the communication channel 003.

[0044] For such a control valve, when the valve core portion 2 is in the first position 001, the first limiting portion 33 abuts against the first mating portion 21. When the first mating portion 21 abuts against the first limiting portion 33, the gap between the valve core body portion 22 and the valve hole wall portion corresponding to the valve hole 341 is set. The minimum flow rate of the first hole 006 is less than the flow rate of the gap between the valve core body portion 22 and the valve hole wall portion corresponding to the valve hole 341. At least part of the first hole 006 is a throttling hole, achieving the smaller flow regulation required by the control valve under special working conditions.

[0045] The first limiting portion 33 is circumferentially arranged around the axis corresponding to the valve hole 341, and the first mating portion 21 is circumferentially arranged around the axis corresponding to the valve core body portion 22. When the valve core portion 2 is in the first position 001, the first limiting portion 33 and the first mating portion 21 are in contact. When the first limiting portion 33 and the first mating portion 21 are in contact, sealing between the inlet cavity 11 and the outlet cavity 12 is achieved between the first limiting portion 33 and the first mating portion 21. Specifically, the first mating portion has a second platform, and the first limiting portion has a first platform. When the valve core portion 2 is in the first position 001, the second platform and the first platform are in contact, achieving sealing between the inlet cavity and the outlet cavity between the first platform and the second platform, and the sealing surrounds the entire circumference of the valve hole.

[0046] More specifically, the first limiting portion 33 has a first platform 331 facing the first direction 002. The first platform 331 is circumferentially arranged around the axis corresponding to the valve hole 341, that is, the first platform 331 is in a ring shape or approximately in a ring shape, and the inner edge of the ring-shaped first platform 331 is connected to the valve hole wall portion corresponding to the valve hole 341. The first mating portion 21 has a second platform 211 arranged opposite to the first platform 331. The second platform 211 is circumferentially arranged around the axis corresponding to the valve core body portion 22, that is, the second platform 211 is in a ring shape or approximately in a ring shape. When the first limiting portion 33 and the first mating portion 21 are in contact, local sealing between the first limiting portion 33 and the first mating portion 21 is achieved, thereby achieving sealing between the inlet cavity 11 and the outlet cavity 12 between the first platform 331 and the second platform 211.

[0047] When the first limiting portion 33 and the first mating portion 21 are in contact, sealing between the inlet cavity 11 and the outlet cavity 12 is achieved between the first limiting portion 33 and the first mating portion 21, and the communication channel 003 realizes the flow rate regulation of the control valve.

[0048] More specifically, the first hole 006 includes a first section 0061 and a second section 0062. The aperture of the first section 0061 is smaller than that of the second section 0062, and the hole depth of the first section 0061 is smaller than that of the second section 0062. Thus, the flow rate of the first section 0061 is smaller than that of the second section 0062, and the communication channel 003 is the first section 0061. When the valve core portion 2 is in the first position 001, a smaller flow rate regulation required for the control valve under special working conditions is achieved. In addition, under special working conditions, a smaller flow rate of the control valve is required, and a smaller aperture of the first hole 006 is required. Specifically, the aperture of the first hole 006 ≥ 0.4 mm; with a smaller aperture, the processing difficulty is greater. The hole depth of the first section 0061 is smaller than that of the second section 0062, that is, the first hole 006 is processed in a segmented manner, reducing the wall thickness of the hole corresponding to the communication channel 003, which is convenient for processing. Small flow rate regulation required for the control valve can be achieved. Specifically, the throttling area > 0 mm 2 , ≤ 0.2 mm 2 .

[0049] It should be noted that: Although this specification has described the present invention in detail with reference to the above embodiments, those of ordinary skill in the art should understand that those skilled in the art can still make modifications, combinations or equivalent substitutions to the present invention, and all technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A control valve, the control valve comprising a valve chamber (1), the control valve comprising a valve body portion (3) and a valve core portion (2), the valve core portion (2) being located in the valve chamber (1), characterized in that, The spool portion (2) includes a spool body portion (22) and a first mating portion (21), the valve body portion (3) includes a valve hole portion (34), the valve hole portion (34) includes a valve hole (341), at least a part of the spool body portion (22) extends along the axis direction of the valve hole (341), at least a part of the first mating portion (21) extends radially from the spool body portion (22) along the valve hole (341), the valve body portion (3) includes a first limiting portion (33), the first limiting portion (33) is connected to the corresponding wall portion of the valve hole (341), when the first limiting portion (33) abuts against the first mating portion (21), the control valve has a communication channel (003), the flow rate of the communication channel (003) is the minimum flow rate of the control valve, and the minimum flow rate > 0.

2. The control valve according to claim 1, characterized in that, When the first limiting portion (33) abuts against the first mating portion (21), the communication channel (003) is located between the first limiting portion (33) and the first mating portion (21), the valve cavity (1) includes an inlet cavity (11) and an outlet cavity (12), and the communication channel (003) conducts the inlet cavity (11) and the valve hole (341); or when the first limiting portion (33) abuts against the first mating portion (21), the communication channel (003) is located between the spool body portion (22) and the corresponding valve hole wall portion of the valve hole (341), the valve cavity (1) includes an inlet cavity (11) and an outlet cavity (12), there is a conducting channel (007) between the first limiting portion (33) and the first mating portion (21), the conducting channel (007) conducts the inlet cavity (11) and the communication channel (003), and the communication channel (003) conducts the conducting channel (007) and the outlet cavity (12).

3. The control valve according to claim 2, characterized in that, The first limiting portion (33) is circumferentially arranged around the corresponding wall portion of the valve hole (341), the first mating portion (21) is circumferentially arranged around the outer periphery of the spool body portion (22), when the first limiting portion (33) abuts against the first mating portion (21), the communication channel (003) is located between the first limiting portion (33) and the first mating portion (21); one of the first limiting portion (33) and the first mating portion (21) has a first notch portion (004), when the first mating portion (21) abuts against the first limiting portion (33), the cavity corresponding to the other of the first limiting portion (33) and the first mating portion (21) and the first notch portion (004) is the communication channel (003), and the communication channel (003) conducts the inlet cavity (11) and the valve hole (341).

4. The control valve according to claim 3, characterized in that, One of the first limiting portion (33) and the first mating portion (21) has a first recessed portion (332) and a first insertion portion (4). The first insertion portion (4) is inserted into the cavity corresponding to the first recessed portion (332). The dimension of the first insertion portion (4) along the recessed direction of the first recessed portion (332) is smaller than the depth dimension of the recess of the first recessed portion (332). The wall portion corresponding to the first notch portion (004) includes at least part of the wall portion corresponding to the first recessed portion (332) and at least part of the wall portion corresponding to the first insertion portion (4).

5. The control valve according to claim 2, characterized in that, The first limiting portion (33) is circumferentially arranged around the wall portion corresponding to the valve hole (341), and the first mating portion (21) is circumferentially arranged around the axis corresponding to the valve core body portion (22). When the first limiting portion (33) and the first mating portion (21) are in contact, the communication channel (003) is located between the first limiting portion (33) and the first mating portion (21). The first mating portion (21) has a first notch portion (004), and the first limiting portion (33) has a second notch portion (005). When the first mating portion (21) and the first limiting portion (33) are in contact, the first notch portion (004) and the second notch portion (005) are arranged opposite to each other. The cavity between the first notch portion (004) and the second notch portion (005) is the communication channel (003), and the communication channel (003) conducts the inlet cavity (11) and the valve hole (341).

6. The control valve according to claim 5, characterized in that, The first mating portion (21) has a first recessed portion (332) and a first insertion portion (4), and the first limiting portion (33) has a second recessed portion (333) and a second insertion portion (40). The first insertion portion (4) is inserted into the cavity corresponding to the first recessed portion (332), and the second insertion portion (40) is inserted into the cavity corresponding to the second recessed portion (333). The dimension of the first insertion portion (4) along the recessed direction of the first recessed portion (332) is smaller than the depth dimension of the recess of the first recessed portion (332), and the dimension of the second insertion portion (40) along the recessed direction of the second recessed portion (333) is smaller than the depth dimension of the recess of the second recessed portion (333). The wall portion corresponding to the first notch portion (004) includes at least part of the wall portion corresponding to the first recessed portion (332) and at least part of the wall portion corresponding to the first insertion portion (4), and the wall portion corresponding to the second notch portion (005) includes at least part of the wall portion corresponding to the second recessed portion (333) and at least part of the wall portion corresponding to the second insertion portion (40).

7. The control valve according to claim 2, characterized in that, When the first limiting portion (33) abuts against the first mating portion (21), at least a part of the valve core body portion (22) is located in the valve hole (341). When the first limiting portion (33) abuts against the first mating portion (21), a gap is provided between the valve core body portion (22) and the valve hole wall portion corresponding to the valve hole (341). The gap between the valve core body portion (22) and the valve hole wall portion corresponding to the valve hole (341) is the communication channel (003). There is a conduction channel (007) between the first limiting portion (33) and the mating portion. The conduction channel (007) conducts the inlet cavity (11) and the communication channel (003), and the communication channel (003) conducts the conduction channel (007) and the outlet cavity (12).

8. The control valve according to claim 1, characterized in that, The first mating portion (21) or the first limiting portion (33) has a first hole (006). The valve cavity (1) includes an inlet cavity (11) and an outlet cavity (12). When the first mating portion (21) abuts against the first limiting portion (33), a gap is provided between the valve core body portion (22) and the valve hole wall portion corresponding to the valve hole (341). The first hole (006) conducts the inlet cavity (11) and the valve hole (341), and the valve hole (341) is in communication with the outlet cavity (12). At least a part of the first hole (006) is the communication channel (003).

9. The control valve according to claim 8, characterized in that, The first hole (006) includes a first section (0061) and a second section (0062). The aperture of the first section (0061) is smaller than that of the second section (0062), and the hole depth of the first section (0061) is smaller than that of the second section (0062).

10. The control valve according to any one of claims 1-9, characterized in that, The throttling area corresponding to the communication channel (003) > 0 mm 2 , ≤ 0.2 mm 2 .

Images