Valve element assembly, preparation mold and preparation method

Abstract

A mold for preparing a valve element assembly comprises a first mold body, a first core mold body and a second core mold body, the first core mold body comprises a through hole, the second core mold body comprises a third sliding block and a fourth sliding block, and the third sliding block and the fourth sliding block can move in the opposite direction or the opposite direction. At least part of the first core mold can be located between the third sliding block and the fourth sliding block, at least part of the first mold can penetrate through the through hole, and the demolding qualification rate of the valve element assembly with the small opening of the communicating cavity is increased.

Description

Technical Field

[0001] The present application relates to the field of fluid control technology, and in particular to a mold for preparing a valve core assembly, a valve core assembly and a preparation method thereof. Background Art

[0002] The control valve is a flow control device in the thermal management system. The control valve generally includes a valve core and a valve body. The valve body is provided with multiple openings. The valve core is driven to rotate by a controller, and the channels opened by the valve core are used to realize the conduction or closure between different openings. Some valve cores are spherical valve cores. In order to meet different application requirements, the opening of the valve core channel needs to be specially designed. The special opening of the valve core channel is a technical issue that needs to be considered for demolding of the valve core produced by injection molding. Summary of the invention

[0003] The purpose of the present application is to provide a valve core component preparation mold that is easy to demould.

[0004] On the one hand, the present application provides a mold for preparing a valve core assembly, the mold comprising a first mold, a first core mold and a second core mold, the first core mold comprising a through hole, the second core mold comprising a third slider and a fourth slider, the third slider and the fourth slider being able to move toward or away from each other, at least a portion of the first core mold being able to be located between the third slider and the fourth slider, and at least a portion of the first mold being able to pass through the through hole.

[0005] By providing a third slider and a fourth slider that can move toward or away from each other, and a first core mold that can be inserted between the third slider and the fourth slider after they are separated, the demoulding qualification rate of the valve core assembly with a smaller conducting cavity opening is improved.

[0006] On the other hand, the present application provides a method for preparing a valve core assembly, wherein the method uses the mold as described above, and the method comprises the following steps:

[0007] The mold is closed;

[0008] injecting a thermoplastic or thermosetting material from a sprue of the mold;

[0009] Pulling out the first mold along a first direction;

[0010] Pulling out the first core mold in a direction perpendicular to the first direction;

[0011] The third sliding block and the fourth sliding block are moved toward each other and then pulled out.

[0012] By first extracting the first core mold from the opening of the valve core assembly accommodating cavity after injection molding, and then moving the third slider and the fourth slider that are in contact with the wall of the accommodating cavity toward each other and separating from the wall of the accommodating cavity before extracting them from the opening of the accommodating cavity, the demoulding qualification rate of the valve core assembly with a smaller opening of the conducting cavity is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A schematic diagram of the three-dimensional structure of an embodiment of the valve core assembly of the present application;

[0014] Figure 2 A schematic diagram of the three-dimensional structure of an embodiment of the valve core assembly of the present application from another perspective;

[0015] Figure 3 This is a three-dimensional structural schematic diagram of another embodiment of the valve core assembly of the present application;

[0016] Figure 4 for Figure 3 A three-dimensional structural schematic diagram of another viewing angle of the embodiment;

[0017] Figure 5 for Figure 3 A schematic diagram of a three-dimensional structure of the embodiment from another viewing angle;

[0018] Figure 6 for Figure 3 A cross-sectional schematic diagram of an embodiment;

[0019] Figure 7 for Figure 2 A cross-sectional schematic diagram of an embodiment;

[0020] Figure 8 A schematic diagram of the exploded structure of the mold part and the control valve assembly for preparing the control valve assembly for this application;

[0021] Fig. 9 A schematic diagram of the partial structural mold closing state of the control valve assembly mold prepared for this application. Specific embodiments

[0022] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0023] It should be understood that the words "first", "second" and similar words used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not indicate a quantity limitation, but indicate the existence of at least one; "several" means two or more quantities, unless otherwise specified. The directional words such as upper, lower, left, right, front, back, inside, outside, top, bottom, etc. mentioned or may be mentioned in the text are defined relative to the structure shown in the corresponding drawings. They are relative concepts, so they may change accordingly according to their different positions and different usage states. Therefore, these or other directional terms should not be interpreted as restrictive terms. "Include" or "comprise" and similar words mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects.

[0024] The valve device of the exemplary embodiment of the present application is described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments and implementations can complement or be combined with each other.

[0025] The first embodiment will be described in detail below with reference to the accompanying drawings.

[0026] like Figure 1 The valve core assembly 1 includes a core body 11 and a transmission part 12. The core body 11 and the transmission part 12 are fixedly connected or are an integral part. The fixed connection here includes threaded connection, bolt connection, clamping, welding, bonding and other connection methods, which are not specifically limited. The transmission part 12 can be connected to the output end of the controller. The controller drives the core body 11 to rotate through the transmission part 12, thereby realizing a change in the connection mode or flow distribution of the control valve. Specifically, the transmission part 12 includes a meshing part 121 and a transition part 122, the meshing part 121 is transmission-connected to the output end of the controller, the transition part 122 is connected to the core body 11, the transition part 122 includes a first limiting part 1221 and a boss part 1222, the outer diameter of the first limiting part 1221 is smaller than the outer diameter of the boss part 1222, so that the first limiting part 1221 and the boss part 1222 form a step part, and a general control valve includes a sealing member (not shown in the figure) and an end cover (not shown in the figure), the sealing member is located at the step part, or it can be said that the sealing member is sleeved on the outer peripheral side of the first limiting part 1221, and along the radial direction of the first limiting part 1221, the sealing member is located between the first limiting part 1221 and the end cover, one side of the sealing member abuts the first limiting part 1221, and the other side abuts the end cover, in some embodiments, the sealing member is an X-type sealing ring, and of course it can also be an O-type sealing ring, which is not limited to this.

[0027] like Figure 1Further, the transition portion 122 also includes an extension section 1223, one end of the extension section 1223 is connected to the core body 11, and the other end is connected to the boss portion 1222. Some control valves also include a sealing structure, which includes a sealing block (not shown in the figure). The sealing block is generally provided with a flange portion, which protrudes outward along the radial direction of the sealing block. The flange portion can be a circle of protrusions along the circumference of the sealing block 31, or a plurality of protrusions distributed along the circumference of the sealing block. In the radial direction of the extension section 1223, the flange portion is located on the outside of the extension section 1223, and in the axial direction of the valve core assembly 1, at least part of the flange portion 312 is located between the boss portion 1222 and the core body 11. Furthermore, the boss portion 1222 includes a second limiting portion 1224, which protrudes from the boss portion 1222. The second limiting portion 1224 can limit the movement of the sealing block in the radial direction. Specifically, the end cover is arranged at the opening of the main body portion 25, and the end cover can limit the movement of the valve core assembly 1 in the axial direction.

[0028] In a general control valve, a sealing structure is provided to achieve sealing between the valve core assembly 1 and the shell accommodating the valve core assembly 1. In some existing valve core assemblies 1, the boss portion 1222 and the extension section 1223 are not provided, and the first limiting portion 1221 is directly connected to the core body 11. In order to better radially limit the sealing structure, the valve core assembly 1 of the present application is provided with a boss portion 1222 and an extension section 1223 between the first limiting portion 1221 and the core body 11. In this way, the axial length of the valve core assembly 1 is increased while the size of the core body 11 remains unchanged, and it can also be said that the length of the transition portion 122 is increased. If the length of the transition portion 122 is too large, it is easy to cause the transition portion 122 to break and fail. In some embodiments of the present application, the strength of the valve core assembly 1 is improved by expanding the radial size of the first limiting portion 1221; further, a reinforcing rib 1225 is provided on the inner side of the first limiting portion 1221 to improve the strength of the first limiting portion 1221.

[0029] like Figures 1 to 6 The core body 11 includes a blocking portion 113 and a limiting portion 112. The core body 11 includes a conducting cavity 111. The limiting portion 112 includes a first channel 1122. The conducting cavity 111 and the first channel 1122 are connected to form a wall of the conducting cavity 111 including at least a portion of the wall of the blocking portion 113. Specifically, the conducting cavity 111 includes an opening limiting portion, and the opening direction of the conducting cavity 111 and the opening direction of the limiting portion 112 form an angle. Further, the plane perpendicular to the axis of the core body 11 is defined as the first reference plane. On the first reference plane, the inner diameter of the blocking portion 113 is greater than the minimum distance of the opening of the conducting cavity 111, that is, along the circumference of the valve core 11, the minimum distance of the opening of the conducting cavity 111 is smaller than the inner diameter of the blocking portion 113.

[0030] Furthermore, the extending surface of the sealing portion 113 is an arc surface, and the sealing portion 113 includes a first recess 1111 and a second recess 1112, and the first recess 1111 and the second recess 1112 are located on both sides of the central axis of the valve core assembly 1, and the first recess 1111 and the second recess 1112 are generally V-shaped, wherein the first recess 1111 includes a first side portion 1111a and a second side portion 1111b, and the first side portion 1111a and the second side portion 1111b are connected, and one end where the first side portion 1111a and the second side portion 1111b are connected is defined as a first connection point A, and the arc surface where the other ends of the first side portion 1111a and the second side portion 1111b are located is a first opening point B, and the distance between the first side portion 1111a and the second side portion 1111b along the axial direction of the valve core assembly 1 is a first distance D, and the first distance D gradually increases from the first connection point A to the first opening point B. The specific design of the first recess 1111 helps to achieve linear or nearly linear flow regulation during the rotation of the valve core assembly. Figure 2 In the embodiment, the law of the increase of the value of the first distance D from the first connection point A to the first opening point B conforms to a nonlinear change, which can also be understood as the outer contour of the first side portion 1111a is an arc segment convex toward the second side portion 1111b, and the outer contour of the second side portion 1111b is an arc segment convex toward the first side portion 1111a. In another embodiment, Figure 5 As described above, the first recessed portion 1111 is substantially V-shaped, that is, the first side portion 1111 a and the second side portion 1111 b extend substantially along a straight line.

[0031] Correspondingly, the second recess 1112 includes a third side portion 1112a and a fourth side portion 1112b, and the third side portion 1112a and the fourth side portion 1112b are connected, and one end where the third side portion 1112a and the fourth side portion 1112b are connected is defined as the second connection point A', and the arc surface where the other ends of the third side portion 1112a and the fourth side portion 1112b are located is defined as the second opening point B', and the distance between the third side portion 1112a and the fourth side portion 1112b along the axial direction of the valve core assembly 1 is the second distance D', and the second distance D' gradually increases from the second connection point A' to the second opening point B'. Through the specific design of the second recess 1112, it is helpful to achieve linear regulation or close to linear regulation of the flow rate during the rotation of the valve core assembly. Furthermore, in Figure 2 In the embodiment, the law of the second distance D' increasing from the second connection point A' to the second opening point B' conforms to the nonlinear change, which can also be understood as the outer contour of the third side portion 1112a is an arc segment convex toward the fourth side portion 1112b, and the outer contour of the fourth side portion 1112b is an arc segment convex toward the third side portion 1112a. In another embodiment, Figure 4As shown, the outer contour of the third side portion 1112a is an arc segment recessed away from the fourth side portion 1112b, and the outer contour of the fourth side portion 1112b is an arc segment recessed away from the third side portion 1112a, that is, the second recess 1112 is generally semicircular or bracket-shaped.

[0032] like Figure 6 , along the circumference of the core body 11, the first recess 1111 and the second recess 1112 extend in opposite directions, the length of the first recess 1111 is greater than the length of the second recess 1112, and the circumferential area of ​​the core body 11 corresponding to the first recess 1111 is defined as the first flow regulation area Q1, and the circumferential area of ​​the core body 11 corresponding to the second recess 1112 is defined as the second flow regulation area Q2, wherein, along the circumference of the core body 11, the central angle φ1 corresponding to the first flow regulation area Q1 is greater than the central angle φ2 corresponding to the second flow regulation area Q2, and by setting the first flow regulation area Q1 to be greater than the second flow regulation area Q2, the apertures of the first connecting hole 22 and the second connecting hole 23 are consistent Or when the flow areas of the two channels 311 are the same, the flow adjustment range on the side of the first connecting hole 22 is greater than the flow adjustment range on the side of the second connecting hole 23. When the core 11 of the valve core assembly 1 rotates in a certain range, the flow on the side of the second connecting hole 23 reaches a maximum, and at the same time, the flow on the side of the first connecting hole 22 gradually decreases. In the thermal management system, it is helpful to control the valve so that when the connecting hole on one side is fully open, the connecting hole on the other side still has a smaller flow area. As the core 11 continues to rotate, the connecting hole on the other side gradually closes. Such a setting helps when the flow on one side reaches a maximum, the opening on the other side is not completely closed but gradually closed, achieving a buffering effect on the refrigeration system. By setting the first flow adjustment area Q1 to be larger than the second flow adjustment area Q2, compared with the situation where the first flow adjustment area Q1 and the second flow adjustment area Q2 are the same, the control valve has a larger adjustment range for the fluid flowing through the first connecting hole 22. Figure 6 In the embodiment shown, the flow rate regulation range that the control valve can achieve for the fluid flowing through one side of the first connecting hole 22 accounts for about 61% of the control valve rotation angle range, which is larger than the regulation range of about 50% when the two flow rate regulation areas are the same in the prior art.

[0033] like Figure 6The core body 11 includes a blocking portion 113, the extended surface of the blocking portion 113 is a curved surface, and the blocking portion 113 is a part of an arc surface. The plane perpendicular to the central axis of the core body 11 and passing through the first connection A or the second connection A' is defined as the second reference plane. The central angle of the blocking portion 113 on the second reference plane is φ3, and φ3 is not greater than 100 degrees. Further, φ3<90°, and in some embodiments φ3=80°. The minimum central angle of the opening of the conducting cavity 111 in the plane perpendicular to the central axis of the valve core assembly 1 is defined as φ5, and in some embodiments φ5 is greater than 150 degrees, specifically, φ5=162 degrees. This solution reduces the proportion of the circumference of the core body 11 occupied by the blocking portion 113, thereby increasing the proportion of the circumference of the core body 11 occupied by the opening of the conducting cavity 111, thereby increasing the flow regulation accuracy of the control valve.

[0034] As shown in the figure, the limiting portion 112 includes an annular wall portion 1121, and the lower end of the blocking portion 113 is connected to the upper end of the annular wall portion 1121. The "upper" and "lower" here only refer to the Figure 7 The placement position shown does not represent the position state of the product in actual use. The thickness of at least part of the annular wall portion 1121 is greater than the thickness of the blocking portion 113. Further, the annular wall portion 1121 includes a first step surface 1121a, and at least part of the first step surface 1121a is exposed to the conduction cavity 111; further, the upper end of the blocking portion 113 is connected to the lower end of the transition portion 122, that is, the upper end of the blocking portion 113 is connected to the lower end of the extension section 1223. The "upper" and "lower" here only refer to the following. Figure 7 The placement position shown does not represent the position state of the product in actual use. The thickness of at least part of the extension section 1223 is greater than the thickness of the blocking portion 113. Furthermore, the extension section 1223 includes a second step surface 1223a, and at least part of the second step surface 1223a is exposed to the conduction cavity 114. By reducing the thickness of the blocking portion 113, it helps to reduce the weight of the control valve. In particular, for control valves used in automobiles, lightweight components help to improve the mileage of the automobile.

[0035] Another embodiment of the present application protects a mold for preparing the valve core assembly 1, such as Figure 8The valve core assembly 1 is generally prepared by an injection molding process, and the preparation mold 100 includes a second mold 101, a first mold 102, a first core mold 103, a third core mold 104 and a second core mold 105, wherein the second mold 101 and the first mold 102 are at least used to mold at least part of the transmission part 12, for example, the meshing part 121 and the reinforcing rib 1225 of the transmission part 12 can be formed by combined injection molding of the second mold 101 and the first mold 102. Specifically, the second mold 101 includes a molding cavity 101a (not shown in the figure), and the first mold 102 is provided with a reinforcing rib forming part 102a on one side end face facing the second mold 101. After the second mold 101 and the first mold 102 are combined, the thermoplastic or thermosetting material can enter between the second mold 101 and the reinforcing rib forming part 102a, and the reinforcing rib 1225 of the transmission part 12 is formed after cooling and curing. In addition, the combination of the first mold 102 and the outer mold (not shown in the figure) can be used to form the annular wall portion 1121 of the limiting portion 112 of the valve core component 1. Specifically, the first mold 102 includes a main body portion 102b, which is cylindrical. When the injection molding is completed, the cavity formed after the first mold 102 is pulled out is the conducting hole of the limiting portion 112.

[0036] Furthermore, the first core mold 103 includes a through hole 103a, and the first mold 102 can penetrate the connecting hole 103a. During the injection molding process, the first mold 102 passes through the through hole 103a of the first core mold 103, so that the rib forming portion 102a protrudes from one side of the through hole 103a, and at least part of the main body 102b protrudes from the other side of the through hole 103a. Specifically, the main body 102b located below the lower end surface of the first core mold 103 can be used to form the limiting portion 112, and the lower end surface of the first core mold 103 on the peripheral side of the main body 102b can form the first step surface 1121a. When the thermoplastic or thermosetting material is cooled and solidified, the outer mold is opened, and the first mold 102 is pulled out of the first core mold 103 to obtain the limiting portion 112 with the first step surface 1121a. Correspondingly, the main body 102b located above the upper end surface of the first core mold 103 can be used to form the extension section 1223, and the upper end surface of the first core mold 103 on the peripheral side of the main body 102b can form the second step surface 1223a.

[0037] Furthermore, the first core mold 103, the third core mold 104 and the second core mold 105 are combined with the outer mold for injection molding to form the core body 11. Specifically, the third core mold 104 includes a first slider 1041 and a second slider 1042. The first slider 1041 and the second slider 1042 can be relatively close to or away from the second core mold 105. The first slider 1041 and the second slider 1042 are located on both sides of the first core mold 103. The first slider 1041 can be used to form the first recess 1111, and the second slider 1042 can be used to form the second recess 1112. Specifically, the first slider 1041 includes a first protrusion 1041a, and the second slider 1042 includes a second protrusion 1042a, wherein along the circumference of the mold, the first protrusion 1041a and the second protrusion 1042a have the same direction, that is, along the circumference of the mold, the first protrusion 1041a extends toward the second protrusion 1042a, and the second protrusion 1042a extends toward the first protrusion 1041a; further, along the circumference of the mold, the length of the first protrusion 1041a is greater than the length of the second protrusion 1042a. When the thermoplastic or thermosetting material is cooled and solidified, the first slider 1041 moves along the side away from the first protrusion 1041a, and the second slider 1042 moves along the side away from the second protrusion 1042a to complete demoulding.

[0038] Furthermore, the second core mold 105 includes a third slider 1051 and a fourth slider 1052. During the injection molding process, at least part of the first core mold 103 is located between the third slider 1051 and the fourth slider 1052. The third slider 1051 and the fourth slider 1052 are used to form at least part of the wall of the blocking portion 113. The third slider 1051 and the fourth slider 1052 can prepare the blocking portion 113 in combination with the outer mold. Specifically, before injection molding, after the third slider 1051 and the fourth slider 1052 move back to back by a predetermined distance, at least part of the first core mold 103 is inserted between the third slider 1051 and the fourth slider 1052, and then The first mold 102 is inserted into the through hole 103a of the first core mold 103 from bottom to top. When the thermoplastic or thermosetting material is cooled and solidified, the first mold 102 is pulled out from the first core mold 103, and then the first core mold 103 moves along an arrangement direction perpendicular to the third slider 1051 and the fourth slider 1052, so that the first core mold 103 withdraws from between the third slider 1051 and the fourth slider 1052, and then the third slider 1051 and the fourth slider 1052 move toward each other to avoid the side wall of the molded blocking part 113, and the third slider 1051 and the fourth slider 1052 are pulled out from the conducting cavity 114 of the core body 1 to complete the demolding.

[0039] Furthermore, the wall of the third slider 1051 close to the first slider 1041 is a convex curved surface, and accordingly, the wall of the first slider 1041 close to the third slider 1051 is a concave curved surface. The first slider 1041 can fit together with the third slider 1051, thereby forming a first recess 1111 after the injection molding is completed; the wall of the fourth slider 1052 close to the second slider 1042 is a convex curved surface, and accordingly, the wall of the second slider 1042 close to the fourth slider 1052 is a concave curved surface. The second slider 1042 can fit together with the fourth slider 1052, thereby forming a second recess 1112 after the injection molding is completed.

[0040] The present application provides a method for preparing a valve core assembly, the method using the mold as described above, and the preparation method comprising the following steps:

[0041] Step 1: mold closing;

[0042] Step 2: injecting thermoplastic or thermosetting material from the pouring port of the mold;

[0043] Step 3: After the thermoplastic or thermosetting material is formed, remove the mold and take out the valve core assembly formed by injection molding.

[0044] In step three, the following sub-steps are included:

[0045] Step I: The first core mold 103 is inserted between the third slider 1051 and the fourth slider 1052;

[0046] Step II: The first mold 102 is inserted into the through hole 103a of the first core mold 103;

[0047] Step III: The third core mold 104 is attached to the second core mold 105 .

[0048] In the above steps, step II is performed before step III, or step II and step III can be performed simultaneously. Of course, step III can be performed first and then step II.

[0049] In step three, the following sub-steps are included:

[0050] Step A: Pull out the first mold 102;

[0051] Step B: extracting the first core mold 103;

[0052] Step C: The third slider 1051 and the fourth slider 1052 move toward each other and then are pulled out;

[0053] Step D: The first slider 1041 and the second slider 1042 move away from each other.

[0054] In the above steps, steps A to C are performed in a certain order, but step D can be performed after step C or before step A, and of course, can also be performed simultaneously with step A or step C.

[0055] It should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although the present invention has been described in detail in this specification with reference to the above embodiments, it should be understood by those skilled in the art that the present invention can still be modified or replaced by equivalents, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A mold for preparing a valve core assembly, characterized in that: The mold comprises a first mold (102), a first core mold (103) and a second core mold (105); the first core mold (103) comprises a through hole (103a); the second core mold (105) comprises a third slider (1051) and a fourth slider (1052); the third slider (1051) and the fourth slider (1052) are capable of moving toward or away from each other; at least a portion of the first core mold (103) is capable of being located between the third slider (1051) and the fourth slider (1052); and at least a portion of the first mold (102) is capable of passing through the through hole (103a).

2. The mold for preparing a valve core component according to claim 1, characterized in that: The mold includes a third core mold (104), and the third core mold (104) includes a first slider (1041) and a second slider (1042). The first slider (1041) and the second slider (1042) can be close to or away from the second core mold (105).

3. The mold for preparing a valve core component according to claim 1 or 2, characterized in that: The wall surface of the third slider (1051) close to the first slider (1041) is a convex curved surface, and the wall surface of the first slider (1041) close to the third slider (1051) is a concave curved surface, and the first slider (1041) can fit the third slider (1051); The wall surface of the fourth slider (1052) close to the second slider (1042) is a convex curved surface, and correspondingly, the wall surface of the second slider (1042) close to the fourth slider (1052) is a concave curved surface, so that the second slider (1042) can fit the fourth slider (1052).

4. The mold for preparing a valve core component according to claim 3, characterized in that: The first slider (1041) includes a first protrusion (1041a), and the second slider (1042) includes a second protrusion (1042a). Along the circumference of the mold, the first protrusion (1041a) extends toward the second protrusion (1042a), and the second protrusion (1042a) extends toward the first protrusion (1041a).

5. The mold for preparing a valve core component according to claim 4, characterized in that: Along the circumference of the mold, the length of the first protrusion (1041a) is greater than the length of the second protrusion (1042a).

6. A valve core assembly, characterized in that: The valve core assembly comprises a core body (11), the core body (11) comprises a blocking portion (113) and a limiting portion (112), the blocking portion (113) is a curved surface, the core body (11) comprises a conducting cavity (111), the wall of the conducting cavity (111) comprises at least a portion of the wall of the blocking portion (113), and a plane perpendicular to the axis of the valve core, the plane where the minimum distance of the opening of the conducting cavity (111) is located is defined as a first reference plane, and on the first reference plane, the inner diameter of the blocking portion (113) is greater than the minimum distance of the opening of the conducting cavity (111).

7. The valve core assembly according to claim 1, characterized in that: The limiting portion (112) comprises an annular wall portion (1121), the lower end portion of the blocking portion (113) is connected to the upper end portion of the annular wall portion (1121), and the thickness of at least part of the annular wall portion (1121) is greater than the thickness of the blocking portion (113); the transmission portion (12) comprises a transition portion (122), the lower end portion of the transition portion (122) is connected to the upper end portion of the blocking portion (113), and the thickness of at least part of the extension section (1223) is greater than the thickness of the blocking portion (113).

8. The valve core assembly according to claim 1 or 2, characterized in that: The blocking portion (113) comprises a first recess (1111) and a second recess (1112); along the circumference of the core body (11), the first recess (1111) and the second recess (1112) extend in opposite directions; along the circumference of the core body (11), the length of the first recess (1111) is greater than the length of the second recess (1112).

9. A method for preparing a valve core assembly, characterized in that: The preparation method adopts the mold described in any one of rights 1 to 5, and the preparation method comprises the following steps: The mold is closed; injecting a thermoplastic or thermosetting material from a sprue of the mold; Pulling out the first mold (102) along a first direction; Pulling out the first core mold (103) in a direction perpendicular to the first direction; The third slider (1051) and the fourth slider (1052) move toward each other and then are pulled out.

10. The method for preparing the valve core assembly according to claim 9, characterized in that: The preparation method further comprises the following steps: After the step of injecting the thermoplastic or thermosetting material from the pouring port of the mold, the method further comprises the following steps: The first sliding block (1041) and the second sliding block (1042) move in opposite directions; The step of mold closing comprises the following steps: The first slider (1041) and the second slider (1042) move towards each other and fit the second core mold (105).

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