A valve core assembly, a preparation mold and a preparation method

Abstract

A mold for preparing a valve core assembly, 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 capable of moving towards or away from each other, at least part of the first core mold being capable of being located between the third slider and the fourth slider, and at least part of the first mold being capable of passing through the through hole, thereby improving the demolding qualification rate of the valve core assembly with a small opening of the conduction cavity.

Description

TECHNICAL FIELD

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

[0002] The control valve is a flow control device in a thermal management system, and generally includes a valve core and a valve body. The valve body is provided with a plurality of openings. The valve core is driven to rotate by a controller, and a channel formed by the valve core is used to realize the conduction or closing 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. How to demold the special opening of the valve core channel is a technical problem that needs to be considered for the valve core produced by the injection molding process. SUMMARY

[0003] The purpose of the present application is to provide a valve core assembly preparation mold which is easy to demold.

[0004] One aspect of the present application provides a mold for preparing a valve core assembly. The mold includes a first mold, a first core mold and a second core mold. The first core mold includes a through hole. The second core mold includes a third sliding block and a fourth sliding block. The third sliding block and the fourth sliding block can move towards or away from each other. 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 pass through the through hole.

[0005] By providing the third sliding block and the fourth sliding block which can move towards or away from each other, and the first core mold which can be inserted between the third sliding block and the fourth sliding block after they are separated, the demolding qualification rate of the valve core assembly with a small opening of the conduction cavity is improved.

[0006] Another aspect of the present application provides a preparation method for preparing a valve core assembly. The preparation method uses the mold as described above. The preparation method includes the following steps:

[0007] The mold is closed;

[0008] A thermoplastic or thermosetting material is injected from a pouring gate of the mold;

[0009] The first mold is extracted in a first direction;

[0010] The first core mold is extracted in a direction perpendicular to the first direction;

[0011] The third sliding block and the fourth sliding block are extracted after moving towards each other.

[0012] The first core mold is first extracted from the opening of the valve core assembly containing cavity after injection molding, and then the third slider and the fourth slider which are attached to the wall of the containing cavity are moved towards each other and separated from the wall of the containing cavity, and then extracted from the opening of the containing cavity, thereby improving the demolding qualified rate of the valve core assembly with a smaller opening of the conducting cavity. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 A perspective structural schematic diagram of an embodiment of the valve core assembly of the present application;

[0014] Figure 2 A perspective structural schematic diagram of another view of an embodiment of the valve core assembly of the present application;

[0015] Figure 3 A perspective structural schematic diagram of another embodiment of the valve core assembly of the present application;

[0016] Figure 4 A perspective structural schematic diagram of another view of an embodiment of the valve core assembly of the present application; Figure 3 A perspective structural schematic diagram of another view of an embodiment of the valve core assembly of the present application;

[0017] Figure 5 A perspective structural schematic diagram of another view of an embodiment of the valve core assembly of the present application; Figure 3 A perspective structural schematic diagram of another view of an embodiment of the valve core assembly of the present application;

[0018] Figure 6 A perspective structural schematic diagram of another view of an embodiment of the valve core assembly of the present application; Figure 3 A sectional schematic diagram of an embodiment of the valve core assembly of the present application;

[0019] Figure 7 A sectional schematic diagram of an embodiment of the valve core assembly of the present application; Figure 2 A sectional schematic diagram of an embodiment of the valve core assembly of the present application;

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

[0021] Figure 9 A mold clamping state schematic diagram of the mold part structure for preparing the control valve assembly of the present application. DETAILED DESCRIPTION

[0022] The exemplary embodiments will be described in detail herein with reference to the attached drawings. In the following description, the same numbers are used to indicate the same or similar components. The embodiments described in the following exemplary embodiments do not represent all the embodiments consistent with the present application. Rather, 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 use of "first", "second", and "third" words and the like in the present application specification and claims do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, "one" or "a" and the like do not indicate a quantity limitation, but indicate the existence of at least one; "several" indicates a quantity of two or more, unless otherwise indicated. The orientation words mentioned or possibly mentioned in the text, such as up, down, left, right, front, back, inner side, outer side, top, bottom, etc. are defined with respect to the structure shown in the corresponding drawing, and they are relative concepts, so they can change accordingly according to their different positions, different use states. Therefore, these or other orientation words should not be interpreted as limiting words. "Include" or "contain" and the like mean that the elements or objects appearing before "include" or "contain" cover the elements or objects listed after "include" or "contain" and their equivalents, and do not exclude other elements or objects.

[0024] The valve device of the example embodiment of the present application will be described in detail below with reference to the drawings. In the case of no conflict, the features in the following embodiments and implementation manners can be supplemented or combined with each other.

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

[0026] As Figure 1 , the valve core assembly 1 includes a core body 11 and a transmission part 12, and 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 with the output end of the controller, and the controller drives the core body 11 to rotate through the transmission part 12, thereby realizing the change of the communication mode or flow distribution of the control valve. Specifically, the transmission part 12 includes an engagement part 121 and a transition part 122, the engagement part 121 is in transmission connection with the output end of the controller, and the transition part 122 is connected with 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 stepped part. Generally, the control valve includes a sealing element (not shown in the figure) and an end cover (not shown in the figure), the sealing element is located at the stepped part, or in other words, the sealing element is sleeved on the outer circumferential side of the first limiting part 1221. Along the radial direction of the first limiting part 1221, the sealing element is located between the first limiting part 1221 and the end cover. One side of the sealing element abuts against the first limiting part 1221, and the other side abuts against the end cover. In some embodiments, the sealing element is an X-shaped sealing ring, of course, it can also be an O-shaped sealing ring, which is not limited.

[0027] As Figure 1Further, the transition portion 122 further comprises an extension segment 1223, one end of the extension segment 1223 is connected to the core body 11, and the other end is connected to the boss portion 1222. Some control valves further comprise a sealing structure, the sealing structure comprises a sealing block (not shown in the figure), the sealing block is generally provided with a flange portion, the flange portion protrudes outward along the radial direction of the sealing block, the flange portion can be a ring of protrusions along the circumferential direction of the sealing block, or can be a plurality of protrusions distributed along the circumferential direction of the sealing block, along the radial direction of the extension segment 1223, the flange portion is located outward of the extension segment 1223, and along the axial direction of the valve core assembly 1, at least part of the flange portion is located between the boss portion 1222 and the core body 11. Further, the boss portion 1222 comprises a second limiting portion 1224, the second limiting portion 1224 protrudes from the boss portion 1222, and the second limiting portion 1224 can limit the movement of the sealing block in the radial direction.

[0028] Generally, a sealing structure is provided in a control valve to achieve sealing between the valve core assembly 1 and the housing accommodating the valve core assembly 1. In some existing valve core assemblies 1, the boss portion 1222 and the extension segment 1223 are not provided, and the first limiting portion 1221 is directly connected to the core body 11. In order to better limit the sealing structure in the radial direction, the valve core assembly 1 of the present application is provided with the boss portion 1222 and the extension segment 1223 between the first limiting portion 1221 and the core body 11. In this way, without changing the size of the core body 11, the axial length of the valve core assembly 1 is increased, which can also be said to increase the length of the transition portion 122. 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 radial size of the first limiting portion 1221 is increased to improve the strength of the valve core assembly 1. Further, the inner side of the first limiting portion 1221 is provided with a reinforcing rib 1225 to improve the strength of the first limiting portion 1221.

[0029] As Figures 1 to 6 The core body 11 comprises a plugging portion 113 and a limiting portion 112, the core body 11 comprises a through cavity 111, the limiting portion 112 comprises a first channel 1122, the through cavity 111 and the first channel 1122 are in communication, the wall forming the through cavity 111 comprises at least part of the wall of the plugging portion 113. Specifically, the through cavity 111 comprises an opening limiting portion, the opening direction of the through cavity 111 and the opening direction of the limiting portion 112 form an angle, further, in a plane perpendicular to the axis of the core body 11, the face on which the minimum distance of the opening of the through cavity 111 is located is defined as a first reference face, on the first reference face, the inner diameter of the plugging portion 113 is greater than the minimum distance of the opening of the through cavity 111, that is, along the circumferential direction of the valve core 11, the minimum distance of the opening of the through cavity 111 is less than the inner diameter of the plugging portion 113.

[0030] Further, the extension surface of the blocking part 113 is an arc surface, the blocking part 113 comprises a first concave part 1111 and a second concave part 1112, the first concave part 1111 and the second concave part 1112 are located on both sides of the axis of the valve core assembly 1, the first concave part 1111 and the second concave part 1112 are generally V-shaped, wherein the first concave part 1111 comprises a first side part 1111a and a second side part 1111b, the first side part 1111a and the second side part 1111b are connected, defining one end of the connection of the first side part 1111a and the second side part 1111b as a first connection A, the arc surface at the other end of the first side part 1111a and the second side part 1111b is a first opening B, the distance of the first side part 1111a and the second side part 1111b along the axial direction of the valve core assembly 1 is a first distance D, the first distance D gradually increases from the first connection A to the first opening B. Through the specific design of the first concave part 1111, it is helpful to realize linear regulation or close to linear regulation of flow during rotation of the valve core assembly. Further, in the embodiment of Figure 2 , from the first connection A to the first opening B, the value of the first distance D increases in accordance with a nonlinear change, which can also be understood as that the outer contour of the first side part 1111a is an arc segment protruding towards the second side part 1111b, and the outer contour of the second side part 1111b is an arc segment protruding towards the first side part 1111a. In another embodiment, as Figure 5 indicated, the first concave part 1111 is generally V-shaped, that is, the first side part 1111a and the second side part 1111b generally extend along a straight line.

[0031] Correspondingly, the second concave part 1112 comprises a third side part 1112a and a fourth side part 1112b, the third side part 1112a and the fourth side part 1112b are connected, defining one end of the connection of the third side part 1112a and the fourth side part 1112b as a second connection A', the arc surface at the other end of the third side part 1112a and the fourth side part 1112b is a second opening B', the distance of the third side part 1112a and the fourth side part 1112b along the axial direction of the valve core assembly 1 is a second distance D', the second distance D' gradually increases from the second connection A' to the second opening B', through the specific design of the second concave part 1112, it is helpful to realize linear regulation or close to linear regulation of flow during rotation of the valve core assembly. Further, in the embodiment of Figure 2 , from the second connection A' to the second opening B', the value of the second distance D' increases in accordance with a nonlinear change, which can also be understood as that the outer contour of the third side part 1112a is an arc segment protruding towards the fourth side part 1112b, and the outer contour of the fourth side part 1112b is an arc segment protruding towards the third side part 1112a. In another embodiment, as Figure 4As shown, the outer contour of the third side 1112a is an arc-shaped segment that is concave to the fourth side 1112b, and the outer contour of the fourth side 1112b is an arc-shaped segment that is concave to the third side 1112a. That is, the second concave part 1112 is generally semi-circular or bracket-shaped.

[0032] like Figure 6 Along the circumference of the core 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. The circumferential region of the core 11 corresponding to the first recess 1111 is defined as the first flow regulation region Q1, and the circumferential region of the core 11 corresponding to the second recess 1112 is defined as the second flow regulation region Q2. Along the circumference of the core 11, the central angle φ1 corresponding to the first flow regulation region Q1 is greater than the central angle φ2 corresponding to the second flow regulation region Q2. By setting the first flow regulation region Q1 to be greater than the second flow regulation region Q2, the diameters of the first connecting hole 22 and the second connecting hole 23 are consistent. Alternatively, if the flow areas of the two channels 311 are the same, the flow regulation range on the first connecting hole 22 side is greater than that on the second connecting hole 23 side. When the core 11 of the valve core assembly 1 rotates within a certain range, the flow rate on the second connecting hole 23 side reaches its maximum, while the flow rate on the first connecting hole 22 side gradually decreases. In the thermal management system, this helps to ensure that when one connecting hole of the control valve is fully open, the other connecting hole still has a smaller flow area. As the core 11 continues to rotate, the other connecting hole gradually closes. This setting helps to ensure that when the flow rate on one side reaches its maximum, the opening on the other side does not completely close but gradually closes, achieving a buffering effect on the refrigeration system. By setting the first flow regulation zone Q1 to be greater than the second flow regulation zone Q2, compared to the case where the first flow regulation zone Q1 and the second flow regulation zone Q2 are the same, the regulation range of the fluid flowing on the first connecting hole 22 side of the control valve becomes larger. Figure 6 In the embodiment shown, the flow rate regulation range that the control valve can achieve for the fluid flowing on one side of the first connecting hole 22 accounts for about 61% of the control valve's rotation angle range, which is greater than the approximately 50% regulation range when the two flow rate regulation zones are the same in the prior art.

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

[0034] As shown in the figure, the limiting part 112 includes an annular wall part 1121, and the lower end of the sealing part 113 is connected to the upper end of the annular wall part 1121. Here, "upper" and "lower" only refer to... Figure 7 The placement shown does not represent the actual position of the product in use. At least a portion of the annular wall 1121 is thicker than the sealing portion 113. Furthermore, the annular wall 1121 includes a first stepped surface 1121a, at least a portion of which is exposed in the conductive cavity 111. Furthermore, the upper end of the sealing portion 113 connects to the lower end of the transition portion 122, that is, the upper end of the sealing portion 113 connects to the lower end of the extension section 1223. Here, "upper" and "lower" only refer to... Figure 7 The placement shown does not represent the actual position of the product in use. At least part of the extension 1223 is thicker than the sealing part 113. Furthermore, the extension 1223 includes a second step surface 1223a, at least part of which is exposed to the conduction cavity 114. By reducing the thickness of the sealing part 113, it helps to reduce the weight of the control valve. Especially for control valves used in automobiles, the lightweighting of components helps to improve the vehicle's mileage.

[0035] Another embodiment of this application protects a mold for manufacturing the above-described valve core assembly 1, such as... Figure 8The valve core assembly 1 is generally prepared by injection molding process. The preparation mold 100 includes a second mold 101, a first mold 102, a first core mold 103, a third core mold and a second core mold. The second mold 101 and the first mold 102 are used to at least form part of the transmission part 12, for example, the engagement part 121 and the reinforcing rib 1225 of the transmission part 12 can be formed by combined injection of the second mold 101 and the first mold 102. Specifically, the second mold 101 includes a molding cavity (not shown in the figure), the first mold 102 is provided with a reinforcing rib forming part 102a on the 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 after cooling and solidification, the reinforcing rib 1225 of the transmission part 12 is formed. In addition, the combination of the first mold 102 and the outer mold (not shown in the figure) can be used to form the ring wall part 1121 of the limiting part 112 of the valve core assembly 1. Specifically, the first mold 102 includes a main body part 102b, which is a cylinder. When the injection is completed, the cavity formed after the first mold 102 is pulled away is the through hole of the limiting part 112.

[0036] Further, the first core mold 103 includes a through hole 103a, and the first mold 102 can penetrate the through hole 103a. During the injection process, the first mold 102 penetrates the through hole 103a of the first core mold 103, so that the reinforcing rib forming part 102a protrudes from one side of the through hole 103a, and at least part of the main body part 102b protrudes from the other side of the through hole 103a. Specifically, the main body part 102b below the lower end face of the first core mold 103 can be used to form the limiting part 112, and the lower end face of the first core mold 103 on the side of the main body part 102b can form the first step face 1121a. When the thermoplastic or thermosetting material cools and solidifies, the outer mold is opened, the first mold 102 is pulled out of the first core mold 103, and the limiting part 112 with the first step face 1121a is obtained. Correspondingly, the main body part 102b above the upper end face of the first core mold 103 can be used to form the extension segment 1223, and the upper end face of the first core mold 103 on the side of the main body part 102b can form the second step face 1223a.

[0037] Further, the first core mold 103, the third core mold and the second core mold combine with the outer mold to injection mold the core body 11. Specifically, the third core mold comprises a first sliding block 1041 and a second sliding block 1042, the first sliding block 1041 and the second sliding block 1042 can relatively close or away from the second core mold, and the first sliding block 1041 and the second sliding block 1042 are located on both sides of the first core mold 103. The first sliding block 1041 can be used for forming the first recess 1111, and the second sliding block 1042 can be used for forming the second recess 1112. Specifically, the first sliding block 1041 comprises a first protruding portion 1041a, and the second sliding block 1042 comprises a second protruding portion 1042a. Along the circumference of the mold, the first protruding portion 1041a and the second protruding portion 1042a are directed to the same direction, i.e. along the circumference of the mold, the first protruding portion 1041a extends towards the second protruding portion 1042a, and the second protruding portion 1042a extends towards the first protruding portion 1041a. Further, along the circumference of the mold, the length of the first protruding portion 1041a is greater than the length of the second protruding portion 1042a. When the thermoplastic or thermosetting material is cooled and solidified, the first sliding block 1041 moves along the side away from the protrusion of the first protruding portion 1041a, and the second sliding block 1042 moves along the side away from the protrusion of the second protruding portion 1042a to complete demolding.

[0038] Further, the second core mold comprises a third sliding block 1051 and a fourth sliding block 1052, and at least part of the first core mold 103 is located between the third sliding block 1051 and the fourth sliding block 1052 during the injection molding process. The third sliding block 1051 and the fourth sliding block 1052 are used to form the wall of at least part of the blocking portion 113, and the third sliding block 1051 and the fourth sliding block 1052 combine with the outer mold to prepare the blocking portion 113. Specifically, before injection molding, the third sliding block 1051 and the fourth sliding block 1052 move backward by a predetermined distance, and then at least part of the first core mold 103 is inserted between the third sliding block 1051 and the fourth sliding block 1052. 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 extracted from the first core mold 103. Then the first core mold 103 moves along the direction perpendicular to the arrangement direction of the third sliding block 1051 and the fourth sliding block 1052, so that the first core mold 103 exits from between the third sliding block 1051 and the fourth sliding block 1052. Then the third sliding block 1051 and the fourth sliding block 1052 move towards each other by a predetermined distance to avoid the side wall of the formed blocking portion 113. The third sliding block 1051 and the fourth sliding block 1052 are extracted from the through cavity 114 of the core body 1 to complete demolding.

[0039] Further, the wall of the third slider 1051 close to the first slider 1041 is a convex curved surface, correspondingly, the wall of the first slider 1041 close to the third slider 1051 is a concave curved surface, the first slider 1041 can be attached to the third slider 1051, and then the first recess 1111 is formed after injection molding; the wall of the fourth slider 1052 close to the second slider 1042 is a convex curved surface, correspondingly, the wall of the second slider 1042 close to the fourth slider 1052 is a concave curved surface, the second slider 1042 can be attached to the fourth slider 1052, and then the second recess 1112 is formed after injection molding.

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

[0041] Step one: mold closing;

[0042] Step two: injecting a thermoplastic or thermosetting material from the pouring gate of the mold;

[0043] Step three: removing the mold after the thermoplastic or thermosetting material is shaped to take out the valve core assembly formed by injection molding.

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

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

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

[0047] Step III: attaching the third core mold to the second core mold.

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

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

[0050] Step A: extracting the first mold 102;

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

[0052] Step C: extracting after the third slider 1051 and the fourth slider 1052 move towards each other;

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

[0054] As in the above steps, steps A to C have a sequence, but step D can be after step C or before step A, of course, it can also be carried out simultaneously with step A or step C.

[0055] It should be noted that the above examples are only used to illustrate the technical solutions described in the present application and not to limit the present application. Although the present application has been described in detail with reference to the above examples, those skilled in the art should understand that the skilled in the art can still modify or equivalently replace the present application, and all technical solutions and improvements that do not deviate from the spirit and scope of the present application should be covered within the scope of the claims of the present application.

Claims

1. A mold for making a valve trim assembly, characterized by, The mold comprises a first mold (102), a first core mold (103) and a second core mold, the first core mold (103) comprises a through hole (103a), the second core mold comprises a third slider (1051) and a fourth slider (1052), the third slider (1051) and the fourth slider (1052) can move towards or away from each other, at least part of the first core mold (103) can be located between the third slider (1051) and the fourth slider (1052), and at least part of the first mold (102) can pass through the through hole (103a); The mold comprises a third core mold, the third core mold comprises a first slider (1041) and a second slider (1042), the first slider (1041) and the second slider (1042) can move close to or away from the second core mold; The wall surface of the third slider (1051) close to the first slider (1041) is a convex curved surface, 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 be attached to 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, and the second slider (1042) can be attached to the fourth slider (1052).

2. The valve trim assembly producing mold of claim 1, wherein, The first slider (1041) comprises a first protruding portion (1041a), the second slider (1042) comprises a second protruding portion (1042a), along the circumference of the mold, the first protruding portion (1041a) extends towards the second protruding portion (1042a), and the second protruding portion (1042a) extends towards the first protruding portion (1041a).

3. The mold for making a spool assembly of claim 2, wherein, Along the circumference of the mold, the length of the first protruding portion (1041a) is greater than the length of the second protruding portion (1042a).

4. A valve trim assembly characterized by, The valve core assembly prepared by the mold of any one of claims 1-3 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 through cavity (111), the wall of the through cavity (111) comprises at least part of the wall of the blocking portion (113), in a plane perpendicular to the valve core axis, the face where the minimum distance of the opening of the through cavity (111) is located is a first reference face, in the first reference face, the inner diameter of the blocking portion (113) is greater than the minimum distance of the opening of the through cavity (111), 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.

5. The valve trim assembly of claim 4, wherein, The limiting part (112) comprises a ring wall part (1121), the lower end of the blocking part (113) is connected to the upper end of the ring wall part (1121), the thickness of at least part of the ring wall part (1121) is greater than the thickness of the blocking part (113), the valve core assembly comprises a transmission part (12), the transmission part (12) comprises a transition part (122), the transition part (122) comprises an extension section (1223), the lower end of the transition part (122) is connected to the upper end of the blocking part (113), and the thickness of at least part of the extension section (1223) is greater than the thickness of the blocking part (113).

6. A valve core assembly according to claim 4 or 5, characterised in that, Along the circumference of the core (11), the length of the first recess (1111) is greater than the length of the second recess (1112).

7. A method of making a valve trim assembly, characterized by, The preparation method adopts the mold according to any one of claims 1-3, and the preparation method comprises the following steps: The mold is closed; A thermoplastic or thermosetting material is injected from the pouring gate of the mold; The first mold (102) is pulled out in a first direction; The first core mold (103) is pulled out in a direction perpendicular to the first direction; The third slider (1051) and the fourth slider (1052) are moved towards each other and then pulled out.

8. The method of claim 7, wherein the valve core assembly is prepared by, The preparation method further comprises the following steps: After the step of injecting a thermoplastic or thermosetting material from the pouring gate of the mold, the following steps are further included: The first slider (1041) and the second slider (1042) are moved away from each other; The mold closing step comprises: The first slider (1041) and the second slider (1042) are moved towards each other and fit the second core mold.

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