Control valve

Abstract

The invention relates to the field of fluid adjustment, in particular to a control valve meeting flow adjustment under special working conditions, a first through hole is formed in a valve element part, at least part of a filling part is located in the first through hole, the valve element part is matched with the filling part, and the filling part is provided with a throttling channel or a throttling channel is formed between the filling part and the valve element part; and meanwhile, the throttling channel is communicated with the valve inner cavity and the outlet cavity, and due to the arrangement of the throttling channel, the control valve can still achieve small flow within a specific range even if factors such as assembly errors and control errors exist.

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 engagement. While the lead screw rotates about its own axis, the lead screw moves along the axis corresponding to the lead screw. The lead screw and the valve core are provided with a limit. The lead screw drives the valve core to move along the axis of the lead screw. Under some working conditions, the required flow rate is small, and due to factors such as assembly error and control error of the control valve, it is difficult to achieve a relatively small flow rate within a specific range. Summary of the Invention

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

[0004] A control valve includes an inlet cavity, an outlet cavity, and a valve inner cavity. The control valve includes a valve core part and a valve body part. The valve body part includes a valve port. At least part of the valve core part is located in the valve inner cavity. The valve core part moves linearly along its direction, and the valve core part and the valve body part cooperate to close and open the valve port. The valve inner cavity is communicated with the inlet cavity. The valve core part includes a first through hole. The control valve includes a filling part, and at least part of the filling part is located in the first through hole; the filling part has a throttling channel, or the gap between at least part of the filling part and at least part of the through hole wall part corresponding to the first through hole is the throttling channel; the throttling channel communicates the valve inner cavity and the outlet cavity.

[0005] For such a control valve, by providing a first through hole in the valve core part and at least part of the filling part being located in the first through hole, through the cooperation of the valve core part and the filling part, there is a throttling channel in the filling part or between the filling part and the valve core part, and at the same time the throttling channel communicates the valve inner cavity and the outlet cavity. The setting of this throttling channel enables the control valve to still achieve a relatively small flow rate within a specific range even in the presence of factors such as assembly error and control error. Description of the Drawings

[0006] Figure 1 Is a cross-sectional view of a control valve for an embodiment;

[0007] Figure 2 Is an enlarged view of area A;

[0008] Figure 3 Is a cross-sectional view of a control valve for another embodiment;

[0009] Figure 4 Is an enlarged view of area B;

[0010] Figure 5 Is a cross-sectional view of a control valve for yet another embodiment;

[0011] Figure 6It is an enlarged view of area C.

[0012] Reference numerals:

[0013] Oral cavity inlet 001, oral cavity outlet 002, valve inner cavity 003, throttling channel 004, valve port 005;

[0014] Valve core part 1, first through hole 11, first section 111, second section 112, through hole wall part 12, groove part 13, groove bottom wall 131, groove opening 132, first end part 14, second end part 15, first peripheral wall part 16;

[0015] Buffer assembly 20, base 2, head 21, third end part 211, first mating wall 2111, main body part 212, filling part 22, filling peripheral wall 222, filling core part 223, throttling hole 224, second peripheral wall part 221, first fitting part 3, spring 4;

[0016] First channel 006, second through hole 007, third through hole 008;

[0017] Valve body part 5, driving part 6, lead screw 7, nut 8, connecting assembly 9. Detailed implementation manners

[0018] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0019] The technical solutions of the detailed implementation manners will be described below with reference to the accompanying drawings:

[0020] A control valve, referring to Figures 1-6 , the control valve includes a driving part 6, a lead screw 7, a nut 8 and a valve body part 5. The control valve includes a valve inner cavity 003. The driving part 6, the lead screw 7 and the nut 8 are located in the valve inner cavity 003. The driving part 6 and the lead screw 7 are fixedly connected. The driving part 6 drives the lead screw 7 to rotate around the axis of the lead screw 7. The nut 8 and the valve body part 5 are fixedly connected. The nut 8 and the lead screw 7 are in threaded cooperation. The lead screw 7 rotates around the axis of the lead screw 7 and moves linearly along the axis direction of the lead screw 7. The control valve includes a valve core part 1 and a connecting assembly 9. The valve core part 1 is located in the valve inner cavity 003. The connecting assembly 9 connects the valve core part 1 and the lead screw 7. The lead screw 7 moves linearly along the corresponding axis of the lead screw 7. The lead screw 7 drives the valve core part 1 to move linearly along the axis direction of the valve core part 1. The valve body part 5 has a valve port 005. During the process of the valve core part 1 moving along the corresponding axis direction of the valve core part 1, the valve core part 1 and the valve body part 5 cooperate to control the closing and opening of the valve port 005.

[0021] A control valve, which includes an inlet cavity 001, an outlet cavity 002, and a valve inner cavity 003. The control valve includes a valve core part 1 and a valve body part 5. The valve body part 5 includes a valve port 005. At least part of the valve core part 1 is located in the valve inner cavity 003. The valve core part 1 moves linearly along its direction, and the valve core part 1 and the valve body part 5 cooperate to close and open the valve port 005. The valve inner cavity 003 communicates with the inlet cavity 001. The valve core part 1 includes a first through hole 11. The control valve includes a filling part 22, and at least part of the filling part 22 is located in the first through hole 11; the control valve has a throttling channel. The filling part 22 has a throttling channel, or the throttling channel 004 is located between at least part of the filling part 22 and the valve core part; the throttling channel 004 communicates the valve inner cavity 003 and the outlet cavity 002.

[0022] For such a control valve, by providing a first through hole in the valve core part and at least part of the filling part being located in the first through hole, through the cooperation of the valve core part and the filling part, when the filling part has a throttling channel or there is a throttling channel between the filling part and the valve core part, and at the same time the throttling channel communicates the valve inner cavity and the outlet cavity, the setting of this throttling channel enables the control valve to still achieve a relatively small flow rate within a specific range even in the presence of factors such as assembly errors and control errors.

[0023] In one embodiment, referring to Figures 5-6 , at least part of the filling part 22 is made of a porous material. The filling part 22 includes a filling peripheral wall and a filling core part. The filling peripheral wall is located on the periphery of the filling core part. At least part of the filling peripheral wall abuts against at least part of the through hole wall part 12 corresponding to the first through hole 11. The filling core part has throttling holes corresponding to the throttling channel 004. The filling part 22 can be inserted into the first through hole. At least part of the filling part abuts against and seals at least part of the through hole wall part 12 corresponding to the first through hole 11, avoiding having a gap between at least part of the filling part and at least part of the through hole wall part 12 corresponding to the first through hole 11, and preventing fluid from flowing into the outlet cavity through this gap, resulting in inaccurate flow rate regulation; therefore, when the valve port is in the closed state, the fluid flows into the outlet cavity through the throttling holes of the filling core part, and the flow rate regulation is more accurate. The filling peripheral wall is a dense material, and the filling core part is a porous material. More specifically, the filling peripheral wall is a dense metal material, making the filling peripheral wall and the through hole wall part closer; the filling core part includes a porous film, and the porous film includes throttling holes, and the fluid flows into the outlet cavity through the throttling holes.

[0024] In one embodiment, referring to Figures 1-2, the gap between at least part of the filling part 22 and at least part of the through-hole wall part 12 corresponding to the first through-hole 11 is a throttling channel 004. At least part of the filling part 22 is a columnar body, and the extending direction of at least part of the filling part 22 is the same as the extending direction of the first through-hole 11. The valve core part 1 includes a groove part 13. The control valve includes a buffer assembly 20. The buffer assembly 20 is located in the groove part 13. The groove part 13 has a groove bottom wall 131. The groove part 13 has a groove opening 132. The groove opening 132 and the groove bottom wall 131 are oppositely arranged. Along the linear movement direction of the valve core part 1, the valve core part 1 has a first end part 14 and a second end part 15. The second end part 15 is closer to the valve port 005 than the first end part 14. The groove opening 132 is located at the first end part 14 of the valve core part 1. The buffer assembly 20 includes a spring 4. The base 2 includes a head 21. Along the linear movement direction of the valve core part 1, the head 21 includes a main body part 212 and a third end part 211. The third end part 211 abuts against the groove bottom wall 131. The diameter of the main body part 212 is smaller than that of the third end part 211. The spring 4 is sleeved on the main body part 212, and one end of the spring 4 abuts against the third end part 211, and the other end of the spring 4 abuts against at least part of the connecting assembly 9. When the valve port 005 of the control valve changes from the open state to the closed state, the valve core part 1 abuts against the valve body part 5, and the valve core part 1 stops moving. The driving part 6 can continue to rotate for a certain period of time, that is, the lead screw 7 can continue to move in the original direction for a moving time. The buffer assembly 20 plays a buffering role for the lead screw 7 and the driving part 6.

[0025] Specifically, the third end part 211 abuts against the groove bottom wall 131. The third end part 211 and the groove bottom wall 131 can be indirectly abutted. The buffer assembly 20 includes a first fitting 3. The first fitting 3 is a gasket. The buffer assembly 20 includes a first fitting 3. The third end part 211 includes a first fitting wall 2111. Along the linear movement direction of the valve core part 1, the first fitting 3 is located between the first fitting wall 2111 and the groove bottom wall 131. The first fitting 3 abuts against the groove bottom wall 131. The first fitting 3 plays a buffering role for the lead screw 7 and the driving part 6. More specifically, the roughness of the first fitting 3 is smaller than the corresponding roughness of the groove bottom wall 131. The first fitting 3 and the base 2 are matched to achieve more precise matching dimensions.

[0026] The first through hole 11 extends from the bottom wall 131 of the groove along the linear movement direction of the valve core portion 1. One port of the first through hole 11 is located at the second end portion 15 of the valve core portion 1, and the other port of the first through hole 11 is located at the bottom wall 131 of the groove. The filling portion 22 is at least part of the base 2. The filling portion 22 extends away from the head 21 along the linear movement direction of the valve core portion 1 from the third end portion 211. Specifically, the first fitting 3 includes a fourth through hole, and the filling portion 22 passes through the fourth through hole. Thus, compared with other embodiments, the filling portion 22 is at least part of the base 2, and the filling portion 22 is closer to the second end portion 15, which is convenient for ensuring the strength of the filling portion 22. For example, when the filling portion 22 is arranged on the lead screw 7, along the linear movement direction of the valve core portion 1, the filling portion 22 needs to pass through the base 2, the structure is complex, and the length of the filling portion 22 is longer, the diameter of the filling portion 22 is smaller, and the strength is lower.

[0027] At least part of the valve body portion 5 is guidingly arranged with the valve core portion 1, and there is a gap between at least part of the valve body portion 5 and the valve core portion 1, and the flow area of this gap is not less than the throttling area corresponding to the throttling channel 004. The fluid flows into the valve inner cavity 003 of the valve through the inlet cavity 001. The valve core portion 1 includes a first channel 006. The first channel 006 communicates the valve inner cavity 003 and the throttling channel 004. Specifically, the first channel 006 conducts the gap between at least part of the valve body portion and the valve core portion 1 and the throttling channel. Along the linear movement direction of the valve core portion 1, the first channel 006 is farther from the second end portion 15 relative to the throttling channel 004. The fluid in the gap between at least part of the valve body portion 5 and the valve core portion 1 flows into the throttling channel 004 through the first channel 006, and flows out of the control valve through the throttling channel 004 and the outlet cavity 002. More specifically, the first channel 006 includes a second through hole 007. The second through hole 007 is located in the valve core portion 1. The flow area of the second through hole 007 is larger than the throttling area of the throttling channel 004. More specifically, one port of the second through hole 007 is located on the first circumferential wall portion 16 of the valve core portion 1 and extends along the radial direction of the valve core portion 1, and the other port of the second through hole 007 is located on the through hole side wall of the first through hole 11. Thus, the fluid in the gap between at least part of the valve body portion 5 and the valve core portion 1 flows into the throttling channel 004 through the second through hole 007, and flows out of the control valve through the throttling channel 004 and the outlet cavity 002.

[0028] The first through hole 11 at least includes a first section 111 and a second section 112. The diameter of the first section 111 is smaller than that of the second section 112. Along the linear movement direction of the valve core part 1, the first section 111 is closer to the second end part 15 relative to the second section 112. The gap between at least part of the through hole wall part 12 corresponding to the first section 111 and the filling part 22 is a throttling channel 004. For such a control valve, it is beneficial to the machining of the first through hole 11. The diameter of the first through hole 11 is small, and the length dimension of the first through hole 11 is long. If the first through hole 11 is a straight hole with a uniform diameter, the machining is difficult. In this embodiment, the first through hole is made into a stepped hole, and only the through hole wall part 12 corresponding to the first section 111 that cooperates with the valve core part 1 has precision requirements, and the machining is more convenient. Of course, the height dimension of the first section 111 is smaller than the height dimension of the second section 112, that is, the height dimension of the through hole wall part 12 corresponding to the first section 111 that actually cooperates with the valve core part 1 is small, and the machining of the first through hole 11 is more convenient.

[0029] More specifically, the throttling area of the throttling channel 004 ≥ 0.1 mm² and ≤ 0.2 mm², which meets the flow regulation of the control valve required under special working conditions. More specifically, the filling part 22 is in or approximately in a columnar shape, the diameter of at least part of the filling part 22 is 1.0 - 2.0 mm, and the aperture of at least part of the first through hole 11 is 1.0 - 2.0 mm, which meets the flow regulation of the control valve required under special working conditions.

[0030] For such a control valve, a throttling channel is formed by the gap between the filling part and the through hole wall part corresponding to the first through hole. For example, according to the processing equipment, a larger aperture size of the first through hole can be set, and then a throttling channel is formed by the cooperation of the gap between the filling part adapted to the first through hole and the through hole wall part corresponding to the first through hole. The machining is convenient; if a through hole with a smaller aperture size is machined directly on the valve core part as a throttling channel, the aperture is small and the machining is difficult.

[0031] In one embodiment, refer to Figures 3-4, the gap between at least part of the filling part 22 and at least part of the through-hole wall part 12 corresponding to the first through-hole 11 is the throttling channel 004. At least part of the filling part 22 is a columnar body, and the extending direction of at least part of the filling part 22 is the same as the extending direction of the first through-hole 11. The valve core part 1 includes a groove part 13. The control valve includes a buffer assembly 20. The buffer assembly 20 is located in the groove part 13. The groove part 13 has a groove bottom wall 131. The groove part 13 has a groove opening 132. The groove opening 132 and the groove bottom wall 131 are oppositely arranged. Along the linear movement direction of the valve core part 1, the valve core part 1 has a first end part 14 and a second end part 15. The second end part 15 is closer to the valve port 005 than the first end part 14. The groove opening 132 is located at the first end part 14 of the valve core part 1. The buffer assembly 20 includes a spring 4. The base 2 includes a head 21. Along the linear movement direction of the valve core part 1, the head 21 includes a main body part 212 and a third end part 211. The third end part 211 abuts against the groove bottom wall 131. The diameter of the main body part 212 is smaller than that of the third end part 211. The spring 4 is sleeved on the main body part 212. One end of the spring 4 abuts against the third end part 211, and the other end of the spring 4 abuts against at least part of the connecting assembly 9. When the valve port 005 of the control valve changes from the open state to the closed state, the valve core part 1 abuts against the valve body part 5, and the valve core part 1 stops moving. The driving part 6 can continue to rotate for a certain period of time, that is, the lead screw 7 can continue to move in the original direction for a moving time. The buffer assembly 20 plays a buffering role on the lead screw 7 and the driving part 6.

[0032] Specifically, the third end part 211 abuts against the groove bottom wall 131. The third end part 211 and the groove bottom wall 131 can be indirectly abutted. The buffer assembly 20 includes a first fitting 3. The first fitting 3 is a gasket. The buffer assembly 20 includes a first fitting 3. The third end part 211 includes a first fitting wall 2111. Along the linear movement direction of the valve core part 1, the first fitting 3 is located between the first fitting wall 2111 and the groove bottom wall 131. The first fitting 3 abuts against the groove bottom wall 131. The first fitting 3 plays a buffering role on the lead screw 7 and the driving part 6. More specifically, the roughness of the first fitting 3 is smaller than the corresponding roughness of the groove bottom wall 131. The first fitting 3 and the base 2 are matched to achieve more precise fitting dimensions.

[0033] The first through hole 11 extends from the bottom wall 131 of the groove along the linear movement direction of the valve core part 1. One port of the first through hole 11 is located at the second end part 15 of the valve core part 1, and the other port of the first through hole 11 is located at the bottom wall 131 of the groove. The filling part 22 is at least part of the base 2. The filling part 22 extends away from the head 21 along the linear movement direction of the valve core part 1 from the third end part 211. Specifically, the first fitting 3 includes a fourth through hole, and the filling part 22 is disposed through the fourth through hole. Thus, compared with other embodiments, the filling part 22 is at least part of the base 2, and the filling part 22 is closer to the second end part 15, which is convenient for ensuring the strength of the filling part 22. For example, when the filling part 22 is disposed on the lead screw 7, along the linear movement direction of the valve core part 1, the filling part 22 needs to be disposed through the base 2, the structure is complex, and the length of the filling part 22 is longer, the diameter of the filling part 22 is smaller, and the strength is lower.

[0034] At least part of the valve body part 5 is guidingly arranged with the valve core part 1, and there is a gap between at least part of the valve body part 5 and the valve core part 1, and the flow area of this gap is larger than the throttling area corresponding to the throttling channel 004. And because there is a gap between at least part of the valve body part 5 and the valve core part 1, the fluid fills the entire valve inner cavity 003.

[0035] The base 2 includes a first channel 006. The first channel 006 communicates the valve inner cavity 003 and the throttling channel 004. One port of the first channel 006 is located at the head 21, and the other port of the first channel 006 is located at the filling part 22. Along the linear movement direction of the valve core part 1, the first channel 006 is farther from the second end part 15 relative to the throttling channel 004. The fluid in the valve inner cavity 003 flows into the groove part 13 and enters the flow channel along the first channel 006, and flows out of the control valve through the throttling channel 004 and the outlet cavity 002. More specifically, the first channel 006 includes a second through hole 007 and a third through hole 008. One of the second through hole 007 and the third through hole 008 is located at at least part of the filling part 22 and the head 21, and the other of the second through hole 007 and the third through hole 008 is located at at least part of the filling part 22. The flow areas of the second through hole 007 and the third through hole 008 are respectively larger than the throttling area of the throttling channel 004. More specifically, the second through hole 007 is located at the head 21 and the filling part 22, the third through hole 008 is located at the filling part 22, and one port of the third through hole 008 is located at the second peripheral wall part 221 of the filling part 22. The fluid in the groove part 13 flows through the throttling channel 004 through the second through hole 007 and the third through hole 008, and flows out of the control valve through the throttling channel 004 and the outlet cavity 002.

[0036] The first through hole 11 at least includes a first section 111 and a second section 112. The diameter of the first section 111 is smaller than that of the second section 112. Along the linear movement direction of the valve core part 1, the first section 111 is closer to the second end part 15 relative to the second section 112. The gap between at least part of the through hole wall part 12 corresponding to the first section 111 and the filling part 22 is the throttling channel 004. For such a control valve, it is beneficial to the machining of the first through hole 11. The diameter of the first through hole 11 is small, and the length dimension of the first through hole 11 is long. If the first through hole 11 is a straight hole with a uniform diameter, the machining is difficult. In this embodiment, the first through hole is made into a stepped hole, and only the through hole wall part 12 corresponding to the first section 111 that cooperates with the valve core part 1 has precision requirements, and the machining is more convenient. Of course, the height dimension of the first section 111 is smaller than that of the second section 112, that is, the height dimension of the through hole wall part 12 corresponding to the first section 111 that actually cooperates with the valve core part 1 is small, and the machining of the first through hole 11 is more convenient.

[0037] More specifically, the throttling area of the throttling channel 004 ≥ 0.1 mm² and ≤ 0.2 mm², which meets the flow regulation of the control valve required under special working conditions. More specifically, the filling part 22 is in or approximately in a columnar shape, the diameter of at least part of the filling part 22 is 1.0 - 2.0 mm, and the aperture of at least part of the first through hole 11 is 1.0 - 2.0 mm, which meets the flow regulation of the control valve required under special working conditions.

[0038] For such a control valve, the throttling channel is formed by the gap between the filling part and the through hole wall part corresponding to the first through hole. For example, according to the processing equipment, a larger aperture size of the first through hole can be set, and then the throttling channel is formed by the cooperation of the gap between the filling part adapted to the first through hole and the through hole wall part corresponding to the first through hole, and the machining is convenient; if a through hole with a smaller aperture size is machined directly on the valve core part as the throttling channel, the aperture is small and the machining is difficult.

[0039] It should be noted that: Although this specification has described the present invention in detail with reference to the above embodiments, however, those of ordinary skill in the art should understand that those skilled in the art can still modify, combine or equivalently replace the present invention, and all technical solutions and their 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 an inlet cavity (001), an outlet cavity (002) and a valve inner cavity (003), the control valve comprising a valve core part (1) and a valve body part (5), the valve body part (5) comprising a valve port (005), at least part of the valve core part (1) being located in the valve inner cavity (003), characterized in that, The spool part (1) moves linearly along its direction, and the spool part (1) and the valve body part (5) cooperate to control the closing and opening of the valve port (005). The valve inner cavity (003) communicates with the inlet cavity (001). The spool part (1) includes a first through hole (11). The control valve includes a filling part (22), and at least part of the filling part (22) is located in the first through hole (11). The control valve has a throttling channel. The filling part (22) has the throttling channel, or the throttling channel (004) is located between at least part of the filling part (22) and the spool part. The throttling channel (004) communicates the valve inner cavity (003) and the outlet cavity (002).

2. The control valve according to claim 1, wherein, At least part of the filling part (22) is a porous material. The filling part (22) includes a filling peripheral wall (222) and a filling core part (223). The filling peripheral wall (222) is located on the peripheral side of the filling core part (223). At least part of the filling peripheral wall (222) abuts against at least part of the through hole wall part (12) corresponding to the first through hole (11). The filling core part (223) has a throttling hole corresponding to the throttling channel (004).

3. The control valve according to claim 2, characterized in that, The filling peripheral wall (222) is a dense material, and the filling core part (223) is a porous material.

4. The control valve according to claim 1, characterized in that, The gap between at least part of the filling part (22) and at least part of the through hole wall part (12) corresponding to the first through hole (11) is the throttling channel (004). At least part of the filling part (22) is a columnar body, and the extending direction of at least part of the filling part (22) is the same as the extending direction of the first through hole (11).

5. The control valve according to claim 4, wherein The spool part (1) includes a groove part (13). The control valve includes a buffer assembly (20), and at least part of the buffer assembly (20) is located in the groove part (13). The groove part (13) has a groove bottom wall (131). The first through hole (11) extends from the groove bottom wall (131) along the linear movement direction of the spool part (1). The buffer assembly (20) includes a base (2), and the base (2) includes a head (21). Along the linear movement direction of the spool part (1), the head (21) includes a third end (211). The filling part (22) is at least part of the base (2), and the filling part (22) extends away from the head (21) along the linear movement direction of the spool part (1) from the third end (211).

6. The control valve according to claim 5, wherein The spool part (1) includes a first channel (006). The first channel (006) communicates the valve inner cavity (003) and the throttling channel (004). Along the linear movement direction of the spool part (1), the first channel (006) is farther from the valve port (005) than the throttling channel (004).

7. The control valve according to claim 5, wherein The base (2) includes a first channel (006) that communicates the valve inner cavity (003) and the throttle channel (004). One port of the first channel (006) is located at the head (21), and the other port of the first channel (006) is located at the filling portion (22). Along the linear movement direction of the valve core portion (1), the first channel (006) is farther from the valve port (005) than the throttle channel (004).

8. The control valve according to any one of claims 6 or 7, characterized in that, The buffer assembly (20) includes a first fitting (3). The third end portion (211) includes a first fitting wall (2111). Along the linear movement direction of the valve core portion (1), the first fitting (3) is located between the first fitting wall (2111) and the bottom wall of the groove (131). The first fitting (3) abuts against the bottom wall of the groove (131), and the first fitting wall (2111) abuts against the first fitting (3). The first fitting (3) includes a fourth through hole, and the filling portion (22) passes through the fourth through hole.

9. The control valve according to any one of claims 4-7, characterized in that, The first through hole (11) at least includes a first section (111) and a second section (112). The diameter of the first section (111) is smaller than that of the second section (112). Along the linear movement direction of the valve core portion (1), the first section (111) is closer to the valve port than the second section (112). The gap between the through hole wall portion (12) corresponding to the first section (111) and at least a part of the filling portion (22) is the throttle channel (004).

10. The control valve according to any one of claims 4-7, characterized in that, The throttle area of the throttle channel (004) is ≥0.1 mm2 and ≤0.2 mm2.

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