Valve device

Abstract

The valve device comprises a valve seat and a valve element assembly, the valve seat is provided with a containing cavity, the side wall of the valve seat is provided with at least one communicating hole penetrating through the inner side and the outer side of the valve seat, the communicating hole is communicated with the containing cavity, and the valve seat is further provided with a valve port; the valve device further comprises a check block, the check block is located in the containing cavity and carries out projection in the axial direction of the valve seat, and the projection plane of the check block is located between the projection plane of the valve element assembly and the projection plane of the hole wall corresponding to the through hole. The check block is provided with an inner side wall facing the valve element and an outer side wall opposite to the valve element, the inner side wall is far away from the through hole relative to the outer side wall, and the distance between the inner side wall and the axis of the valve seat is larger than or equal to the outer radius of the valve element. According to the valve device, lateral impact of fluid on the valve element assembly can be improved, abrasion between the valve element assembly and a valve seat at a valve port due to deflection of the valve element assembly is reduced, the sealing performance of the valve element assembly is improved, and the service life of the valve element assembly is prolonged.

Description

Technical Field

[0001] The present application relates to the field of valve technology, and in particular to a valve device. Background Art

[0002] Currently, electronic expansion valves are commonly used to regulate fluid flow in various cooling and heating devices, such as air conditioners, refrigerators, and heat pump water heaters. These valves consist of a valve seat, a valve needle, and a drive assembly. The valve seat comprises a base and a valve core seat located within the base. The valve core seat is provided with multiple circumferentially distributed guide holes that connect the inlet of the electronic expansion valve with the inner cavity of the valve core seat. Driven by the drive assembly, the valve needle moves axially within the inner cavity of the valve core seat to open or close the valve port of the electronic expansion valve. When the valve port is open, the inner cavity of the valve core seat and the valve port are connected. When the valve port is closed, the inner cavity of the valve core seat and the valve port are disconnected, and the valve port remains connected to the outlet of the electronic expansion valve. Thus, by controlling the axial movement of the valve needle, the valve port can be opened and closed, and flow rate and pressure can be regulated.

[0003] However, when the fluid flowing into the inlet of the electronic expansion valve flows into the inner cavity of the valve core seat through the guide hole of the valve core seat, the fluid will produce a lateral impact on the valve needle component, causing the moving valve needle component to deflect, and then cause wear of the valve needle component and the valve seat at the valve port, affecting the valve closing sealing and service life of the valve assembly. Summary of the Invention

[0004] The purpose of the present application is to provide a valve device that can improve the lateral impact of the fluid on the valve core assembly, reduce the deflection of the valve core component, and improve the sealing and service life of the valve core assembly.

[0005] The valve device in the present application includes a valve seat and a valve core assembly. The valve seat is provided with an accommodating cavity. The side wall of the valve seat has at least one guide hole extending through the inner and outer sides thereof, the guide hole being in communication with the accommodating cavity. The valve seat is also provided with a valve port. The valve core assembly includes a valve core, at least a portion of which is located within the accommodating cavity. The valve core is capable of axial movement to approach or move away from the valve port.

[0006] The valve device further includes a stopper, the stopper being located in the accommodating cavity, the stopper being located on a side of the guide hole close to the accommodating cavity, and a projection surface of the stopper being located between a projection surface of the valve core assembly and a projection surface of a hole wall corresponding to the guide hole when projected along the axial direction of the valve seat;

[0007] The stopper has an inner wall facing the valve core and an outer wall facing away from the valve core, the inner wall is farther away from the guide hole than the outer wall, and the distance between the inner wall and the axis of the valve seat is greater than or equal to the outer radius of the valve core.

[0008] In this application, the stopper is located in the accommodating cavity. The stopper is located on the side of the guide hole close to the accommodating cavity. Projected along the axial direction of the valve seat, the projection surface of the stopper is located between the projection surface of the valve core assembly and the projection surface of the hole wall corresponding to the guide hole. At the same time, the distance between the inner side wall of the stopper and the axis of the valve seat is greater than or equal to the outer radius of the valve core. In this way, when the fluid flows from the guide hole into the accommodating cavity of the valve seat, the stopper can block the fluid, reducing or avoiding the lateral impact of the fluid directly on the outer side wall of the valve core assembly, thereby improving the deflection of the valve core assembly due to fluid impact and the wear of the valve core assembly and the valve seat at the valve port, ensuring the sealing effect of the valve core assembly when closing the valve port and the reliability of long-term use, thereby improving the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a structural diagram of the valve device in the first embodiment of the present application;

[0010] Figure 2 for Figure 1 A top view of the middle valve assembly;

[0011] Figure 3 for Figure 2 AA sectional view of the middle valve device;

[0012] Figure 4 for Figure 2 Cross-sectional view of the middle valve device along line BB;

[0013] Figure 5 for Figure 4 Schematic diagram of the assembly structure of the valve stem assembly and the valve core assembly;

[0014] Figure 6 for Figure 4 Enlarged view of the middle C area;

[0015] Figure 7 for Figure 3 Schematic diagram of part of the structure of the middle valve seat;

[0016] Figure 8 for Figure 3 Top view of the middle valve seat;

[0017] Figure 9 for Figure 8 Middle HH section view;

[0018] Figure 10 for Figure 4 A partial cross-sectional view of the matching position of the middle valve seat and valve core assembly, from a three-dimensional perspective;

[0019] Figure 11 for Figure 6Schematic diagram of the center block, guide hole and valve core projected along the radial direction;

[0020] Figure 12 A schematic diagram of another matching method of the stopper and the valve core assembly;

[0021] Figure 13 This is a schematic diagram of the first structure of the stopper in the embodiment of the present application;

[0022] Figure 14 This is a schematic diagram of the second structure of the stopper in the embodiment of the present application;

[0023] Figure 15 This is a schematic diagram of the third structure of the stopper in the embodiment of the present application;

[0024] Figure 16 This is a fourth structural diagram of the stopper in the embodiment of the present application;

[0025] Figure 17 This is a structural diagram of the cooperation between the valve core assembly and the valve seat in the second embodiment of the present application;

[0026] Figure 18 for Figure 17 Schematic diagram from the perspective of the three-dimensional structure;

[0027] Figure 19 This is a structural diagram of another matching method of the stopper and the valve core assembly in the second embodiment of the present application;

[0028] Figure 20 This is a schematic structural diagram of the cooperation between the valve core assembly and the valve seat in the third embodiment of the present application;

[0029] Figure 21 for Figure 20 Schematic diagram from the perspective of the three-dimensional structure.

[0030] The above-mentioned reference numerals are explained as follows:

[0031] 100-outlet pipe; 200-inlet pipe; 300-valve device; 400-base;

[0032] 1- casing; 2- valve body;

[0033] 3-valve seat; 31-top wall; 32-bottom wall; 33-connecting portion; 3a-valve port; 3b-conducting hole; 3c-first flow channel; 3d-accommodating cavity; 3e-second flow channel; 3g-first hole; 3h-third flow channel;

[0034] 4-valve core assembly; 41-valve core; 41a-flow hole; 42-second spring; 43-nut guide sleeve;

[0035] 5- second sealing ring;

[0036] 6-valve stem assembly; 61-valve stem; 62-spring support frame; 63-stop member; 64-first spring; 65-bearing; 66-bearing pad;

[0037] 7- third sealing ring;

[0038] 8- rotor assembly;

[0039] 9-stopper; 91-inner wall; 92-outer wall;

[0040] 10-sealing ring; 11-first sealing ring. DETAILED DESCRIPTION

[0041] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0042] Please refer to Figure 1-5 , Figure 1 This is a schematic structural diagram of the valve device 300 in the first embodiment of the present application. The valve device 300 is connected to the inlet pipe 200 and the outlet pipe 100; Figure 2 for Figure 1 A top view of the middle valve device 300; Figure 3 for Figure 2 A cross-sectional view of the middle valve device 300 taken along the line AA; Figure 4 for Figure 2 A sectional view of the middle valve device 300 along the line BB; Figure 5 for Figure 4 Schematic diagram of the structure of the assembly of the middle valve stem assembly 6 and the valve core assembly 4.

[0043] The valve device 300 in this embodiment is specifically an electronic expansion valve, but may also be other types of devices. The valve device 300 includes a stator assembly (not shown in the figure), a rotor assembly 8, a valve stem assembly 6, a sleeve 1, a valve body 2, a valve seat 3, and a valve core assembly 4. The rotor assembly 8 is located in the inner cavity of the sleeve 1, and the stator assembly is sleeved on the outer periphery of the sleeve 1. The sleeve 1 and one end of the valve body 2 are axially connected, and the other end of the valve body 2 and the valve seat 3 are axially connected. The valve seat 3 and the valve body 2 can also be set as one piece. The above components are coaxially arranged, and the axial direction is the axial direction of each part or the direction parallel to the axis. The rotor assembly 8 rotates axially to drive the valve stem assembly 6 to rotate. The valve core assembly 4 includes a valve core 41, a second spring 42 and a nut guide sleeve 43. The valve core 41 is a valve core sleeve in this embodiment. The valve core sleeve is a cylindrical structure with a bottom wall. The bottom wall has a flow hole 41a, which is used as a balancing hole. The second spring 42 and the nut guide sleeve 43 are both located in the valve core 41. The nut guide sleeve 43 is connected to the valve core 41. The nut guide sleeve 43 is provided with a flange at one end close to the sleeve 1, and an annular step 21 is provided on the inner side of the valve body 2. The step 21 can limit the flange of the nut guide sleeve 43. The nut guide sleeve 43 and the valve seat 3 are also anti-rotationally connected, that is, the nut guide sleeve 43 and the valve seat 3 cannot rotate relative to each other.

[0044] The valve stem assembly 6 includes a valve stem 61, a spring support frame 62, a first spring 64, a bearing 65, a bearing pad 66 and a stop component 63. One end of the valve stem 61 is connected to the valve core assembly 4, specifically, it is threadedly engaged with the nut guide sleeve 43, and the other end of the valve stem 61 is connected to the rotor assembly 8. When the stator assembly is energized, a magnetic field is generated, and the rotor assembly 8 is rotated under the action of the magnetic field force. The rotor assembly 8 drives the valve stem 61 of the valve stem assembly 6 to rotate. With the cooperation of the valve stem 61 and the nut guide sleeve 43, the nut guide sleeve 42 can move axially, thereby driving the valve core assembly 4 to move axially. The valve seat 3 is provided with a valve port 3a, which is connected to the outlet pipe 100. The opening and closing of the valve port 3a and the accommodating chamber 3d are controlled by the valve core assembly 4, and the accommodating chamber 3a and the inlet pipe 200 are connected. When the valve core assembly 4 moves axially, it can approach or move away from the valve port 3a. The valve core assembly 4 moves away from the valve port 3a, the valve port 3a is opened, and the valve port 3a is connected to the accommodating chamber 3d. The valve core assembly 4 seals the valve port 3a, the valve port 3a is disconnected from the accommodating chamber 3d, and the valve port 3a is closed, thereby realizing the opening or closing control of the valve device 300 to achieve the purpose of regulating flow and pressure.

[0045] This embodiment also includes a first sealing ring 11 and a sealing ring 10. The first sealing ring 11 and the sealing ring 10 are axially arranged between the valve body 2 and the valve seat 3. The sealing ring 10 is located on the inner side of the first sealing ring 11 and can slide with the outer side wall of the valve core 41. The combination of the first sealing ring 11 and the sealing ring 10 effectively achieves a seal while not interfering with the movement of the valve core 41. The valve device 300 also includes a second sealing ring 5 and a third sealing ring 7. The second sealing ring 5 is located on the outer side of the lower end of the valve seat 3, and the third sealing ring 7 is located on the outer side of the lower end of the valve body 2 to seal against external components.

[0046] Please combine Figure 6-10 understand, Figure 6 for Figure 4 Enlarged view of the middle C area; Figure 7 for Figure 3 Schematic diagram of part of the structure of the middle valve seat 3; Figure 8 for Figure 3 A top view of the middle valve seat 3; Figure 9 for Figure 8 Middle HH section view; Figure 10 for Figure 4 The partial cross-sectional view of the matching position of the middle valve seat 3 and the valve core assembly 4 is a three-dimensional perspective.

[0047] In this embodiment, the valve seat 3 of the valve device 300 is provided with a receiving chamber 3d. The valve seat 3 is specifically a hollow sleeve-like structure, and the receiving chamber 3d is a part of the hollow chamber of the valve seat 3. The side wall of the valve seat 3 has at least one conducting hole 3b that passes through the inner and outer sides of the side wall. The side wall of the valve seat 3 is the wall portion located between the axial ends of the valve seat 3. The inner side of the side wall of the valve seat 3 is the side close to the receiving chamber 3d inside the valve seat 3, and the outer side of the side wall of the valve seat 3 is the side away from the receiving chamber 3d. The conducting hole 3b passes through the inner and outer sides, so that the space outside the valve seat 3 and the receiving chamber 3d inside can be connected. Figure 3 、 4 Omitted Figure 1 The base 400 of the valve device 300 has an inner cavity, the valve seat 3 is located in the inner cavity, and at least one conducting hole 3b is connected to the inner cavity of the base 400. Figure 1 As shown, the valve device 300 includes an inlet pipe 200 and an outlet pipe 100. The inlet pipe 200 is mounted on the base 400 and communicates with the inner cavity of the base 400. After the fluid enters the inner cavity of the base 400 through the inlet pipe 200, it can flow into the accommodating cavity 3d of the valve seat 3 through at least one guide hole 3b. This allows the fluid to flow relatively evenly in the circumferential direction toward the accommodating cavity 3d of the valve seat 3, thereby flowing relatively evenly and stably toward the valve port 3a of the valve seat 3. In this embodiment, there are at least two guide holes 3b.

[0048] In this embodiment, at least part of the valve core assembly 4 is located in the accommodating cavity 3d. Figure 6 The valve core assembly 4 is in a closed valve state at this time. The axial direction is defined in this application as the up-down direction. The end of the valve core assembly 4 axially close to the valve port 3a is the lower end. The valve core assembly 4 in this embodiment includes a valve core 41, a second spring 42 located inside the valve core 41, and a nut guide sleeve 43. The second spring 42 is arranged between the bottom wall of the valve core 41 and the nut guide sleeve 43. The lower end of the valve core 41 is against the position of the valve port 3a. When the valve core assembly 4 opens the valve device 300, the valve core assembly 4 is in Figure 6 The hollow inner cavity of the valve seat 3 specifically includes a first hole 3g. The apertures of the first hole 3g and the valve port 3a are both smaller than the aperture of the accommodating cavity 3d. The hole wall of the first hole 3g can slide with the valve core 41 of the valve core assembly 4 to play a guiding role.

[0049] It is worth noting that the valve device 300 in this embodiment further includes a stopper 9, which is provided between at least one guide hole 3b and the valve core assembly 4. At least one guide hole 3b is distributed circumferentially on the valve seat 3, and can be evenly distributed on the valve seat 3. At least a portion of the stopper 9 is located on the inner side of the guide hole 3b, which is the side of the guide hole 3b close to the accommodating cavity 3b. Along the axial projection of the guide hole 3b, the axial direction of the guide hole 3b is also the radial direction of the valve device 300. The projection surface of the stopper 9 is defined as the first projection surface 9s, and the projection of the hole wall corresponding to the guide hole 3b is defined as the second projection surface 3bs (shown in FIG. Figure 11 ), the first projection surface 9s and the second projection surface 3bs are at least partially overlapped. In other words, the stopper 9 is located in the accommodating cavity 3b, on the inner side of the guide hole 3b, and is spaced apart from the stopper 9. At the same time, the stopper 9 has an inner side wall 91 facing the valve core 41 and an outer side wall 92 facing away from the valve core 41. The inner side wall 91 of the stopper 9 and the axis X of the valve seat 3 (shown in FIG. Figure 4) is greater than the outer radius of the valve core assembly 4, that is, the stopper 9 can be located outside the valve core 41 of the valve core assembly 4. When the inner sidewall 91 of the stopper 91 is a curved surface, the distance between the inner sidewall 91 and the axis X of the valve seat 3 is the inner diameter of the stopper 9, and the distance between the outer sidewall 92 and the axis X of the valve seat 3 is the outer diameter of the stopper 9. When the inner sidewall 91 is a non-curved surface, the minimum distance between the inner sidewall 91 and the axis X of the valve seat 3 is greater than the outer radius of the valve core 41. When the valve core assembly 4 and the guide hole 3b are radially opposite, specifically when a portion of the sidewall of the valve core 41 is radially opposite to the guide hole 3b, the stopper 9 will be located between the valve core assembly 4 and the guide hole 3b. Thus, when the fluid flows from the conducting hole 3b into the accommodating chamber 3d, the stopper 9 can block the fluid, reducing or preventing the fluid from directly impacting the outer wall of the valve core assembly 4, thereby improving the deflection of the valve core assembly 4 due to the fluid impact, and then improving the wear of the valve core assembly 4 and the valve seat at the valve port 3a caused by the deflection, thereby ensuring the sealing effect of the valve core assembly 4 when closing the valve port 3a and the reliability of long-term use, thereby improving the service life. It can be seen that any valve device 300 in which the fluid inlet is arranged on the side of the valve seat 3 having at least one conducting hole 3b and may form a lateral impact on the valve core assembly 4 can be provided with the stopper 9, and is not limited to electronic expansion valves, and can also be a solenoid valve, etc.

[0050] like Figure 6 As shown, when the valve core assembly 4 is in the closed state, a portion of the side wall of the valve core 41 is radially opposed to the guide hole 3b. When the valve core assembly 4 is opening or closing the valve, a portion of the side wall of the valve core 41 is also radially opposed to the guide hole 3b. The stopper 9 is always located between the valve core 41 and the guide hole 3b, thereby consistently reducing the impact of the fluid on the valve core 41. However, it can be seen that the position of the valve core assembly 4 changes dynamically during the opening and closing movements. Depending on the stroke setting of the valve core assembly 4, the guide hole 3b, and the dimensional design of the stopper 9, the stopper 9 may not always be located between the valve core assembly 4 and the guide hole 3b when the valve core 41 is in other positions in the closed position. For example, if the valve core assembly 4 has a long stroke and the valve core assembly 4 is a certain distance away from the valve port 3a, the valve core assembly 4 and the guide hole 3b are axially offset. In this case, the stopper 9 and the valve core assembly 4 may also be axially offset. However, it can be seen that, along the axial projection of the valve seat 3 , the projection surface of the stopper 9 is always between the projection surface of the valve core 41 and the projection surface of the hole wall of the conducting hole 3 b .

[0051] In summary, the embodiment of the present application limits at least a portion of the block 9 to be located on the inner side of the guide hole 3b, and the distance between the outer wall 92 of the block 9 and the axis X of the valve seat 3 is smaller than the inner diameter of the accommodating chamber 3d, so as to limit the fluid from flowing directly from the guide hole 3b to the middle of the accommodating chamber 3d, and the distance between the inner wall 91 of the block 9 and the axis X of the valve seat 3 is larger than the outer radius of the valve core 41 of the valve core assembly 4, that is, it does not interfere with the axial movement of the valve core assembly 4.

[0052] Specifically, please refer to Figure 7 , and combined with Figure 11 understand, Figure 11 for Figure 6 Schematic diagram of the middle stopper 9, the conducting hole 3b and the valve core 41 projected along the axial direction of the conducting hole 3b.

[0053] Projected along the axial direction of the conducting hole 3b, the widthwise sides of the first projection surface 3bs of the conducting hole 3b coincide with the widthwise sides of the second projection surface 9s of the stopper 9, or the widthwise sides of the first projection surface 3bs lie within the widthwise sides of the second projection surface 9s. The width of the first projection surface 3bs is the diameter d of the conducting hole 3b. Of course, the conducting hole 3b is not limited to a circular shape and may also have other shapes. For non-circular shapes, the width of the first projection surface 3bs is the largest dimension in the widthwise direction. The widthwise direction is the direction perpendicular to the projection surface and the axial direction of the valve device 300. Figure 11 In the figure, the two sides of the first projection surface 3bs in the width direction coincide with the two sides of the second projection surface 9s in the width W direction. Then, in the circumferential direction, the block 9 can completely block the passage 3b and the valve core assembly 4. The fluid cannot directly impact the valve core assembly 4 in the radial direction and needs to flow around the two sides of the block 9 or the top and bottom of the block 9 before it can flow to the valve port 3a. It is easy to understand that the two sides of the first projection surface 3bs in the width direction are within the two sides of the second projection surface 9s in the width direction, that is, the width W of the block 9 can be greater than the width of the passage 3b, that is, Figure 11 The width dimension of the stopper 9 can be further increased to more reliably limit the fluid from directly impacting the valve core assembly 4. Of course, the widthwise sides of the second projection surface 9s can also be located within the widthwise sides of the first projection surface 3bs. In this case, although the stopper 9 cannot completely block the lateral impact of the fluid on the valve core assembly 4 in the circumferential direction, it can still play a certain role in reducing lateral impact.

[0054] It can be seen that the stopper 9 is just blocked between the guide hole 3b and the valve core assembly 4 to leave as much space as possible for the fluid to flow. For example, the stopper 9 can be set to have a maximum width smaller than the outer diameter of the valve core 41, such as less than or equal to half the outer diameter of the valve core 41. Figure 11As shown, the width of the guide hole 3b along its axial projection is its diameter d, and the width of the valve core 41 along the axial projection of the guide hole 3b is its outer diameter D. The diameter D is larger than the circumferential width of the stopper 9 and can be twice or more than the circumferential width of the stopper 9.

[0055] Look again Figure 6 、 9 In this embodiment, one end of the stopper 9 along the axial direction is provided on the valve seat 3, specifically, the lower end of the stopper 9 is connected to the valve seat 3. As mentioned above, there is a size difference between the accommodating cavity 3d of the valve seat 3 and the first hole 3g and the valve port 3a. At this time, the cavity wall of the accommodating cavity 3d includes a top wall 31 and a bottom wall 32 opposite to each other in the axial direction. The lower end of the stopper 9 can be connected to the bottom wall 32. At this time, the other end of the stopper 9 along the axial direction, that is, the upper end of the stopper 9 and the valve seat 3 have a gap in the axial direction. The gap is defined as the first flow channel 3c. The first flow channel 3c communicates with the gap between the stopper 9 and the guide hole 3b. The gap between the stopper 9 and the guide hole 3b can be defined as the second flow channel 3e. Figure 6 shown.

[0056] At this time, the fluid flows through the guide hole 3b into the second flow channel 3e between the stopper 9 and the guide hole 3b, and can then flow from both sides of the stopper 9 and the first flow channel 3c to between the stopper 9 and the valve core 41. That is, the stopper 9 does not completely block the space between the valve core assembly 4 and the guide hole 3b in the axial direction, and the first flow channel 3c is left to ensure that the fluid can flow more fully. The height of the first flow channel 3c is relatively small in the axial direction to ensure that the guide hole 3b is basically blocked in the axial direction, leaving only a small space for the fluid to pass through. Moreover, the fluid first enters the second flow channel 3e between the stopper 9 and the guide hole 3b, then flows axially, and then flows into the first flow channel 3c. This portion of fluid will not directly impact the valve core assembly 4 after entering from the guide hole 3b. Therefore, even if the fluid flows from the first flow channel 3c to the valve core assembly 4, the purpose of improving the impact can still be achieved.

[0057] The stopper 9 in this embodiment is provided on the valve seat 3, and can be connected to the valve seat 3 or can be an integral structure with the valve seat 3. Figure 9As shown, the stopper 9 and the valve seat 3 can be machined separately and then welded to the valve seat 3, which is relatively simple to process. As previously mentioned, the valve seat 3 is provided with at least one guide hole 3b. To prevent the fluid entering each guide hole 3b from impacting the valve core assembly 4, each guide hole 3b can have a corresponding stopper 9 to block the fluid. Each guide hole 3b can be provided with a stopper 9. In this case, the number of stoppers 9 and the number of guide holes 3b are equal. At least one stopper 9 is arranged at intervals along the circumference of the valve seat 3, allowing the fluid to flow from between adjacent stoppers 9 to the valve port 3a. In this case, the stopper 9 is separated and then connected to the valve seat 3, which is easier to implement in terms of process. After the stopper 9 is connected to the valve seat 3, the inner hole of the stopper 9 and valve seat 3 as a whole is then fine-machined to ensure the quality of the fit with the valve core assembly 4. In particular, as mentioned later, the contact fit between the stopper 9 and the valve core 41 is achieved. Therefore, the valve seat 3 and the stopper 9 are fine-machined simultaneously to better meet the contact fit precision requirements.

[0058] It is understood that the configuration is not limited to having one stopper 9 for each conducting hole 3b. For example, one stopper 9 can simultaneously block two conducting holes 3b, especially when the two conducting holes 3b are relatively close in the circumferential direction. Alternatively, one conducting hole 3b can be equipped with two or more stoppers 9, and adjacent stoppers 9 can have a gap in the circumferential direction to allow fluid to flow. The gap can have an angle with the radial direction to avoid impact on the valve core assembly 4. Alternatively, some conducting holes 3b can be equipped with stoppers 9 on their inner sides, while others are not. It is understood that there are many ways to arrange the stoppers 9, and this embodiment does not impose any specific restrictions.

[0059] The stopper 9 can be made of brass, which is a soft material. The stopper 9 is relatively soft, which facilitates its installation with the valve core assembly 4 and the valve seat 3 and reduces the noise generated by the fluid or the valve core assembly 4 colliding with the stopper 9 during movement. Of course, the stopper 9 can also be made of other materials, such as stainless steel, and the stopper 9 and the valve seat 3 can be made of the same or different materials.

[0060] In addition, if Figure 6 、 10 As shown, the distance between the inner side wall 91 of the stopper 9 facing the valve core and the axis X of the valve seat 3 in this embodiment is greater than the outer radius of the valve core 41. There is a gap between the stopper 9 and the valve core 41, and the gap forms a third flow channel 3h. The fluid can easily flow between the valve core assembly 4 and the stopper 9, which is conducive to the final flow of the fluid to the valve port 3a.

[0061] Please see Figure 12 , Figure 12 It is a structural diagram of another matching mode between the stopper 9 and the valve core assembly 4.

[0062] Figure 12 In the embodiment, the stopper 9 can contact the valve seat 3 assembly, specifically the outer wall of the valve core 41. That is, the distance between the inner wall 91 of the stopper 9 facing the valve core and the axis X of the valve seat 3 can be slightly larger than the outer radius of the valve core 41. The stopper 9 and the valve core 41 can slide in contact. In this way, the stopper 9 can also guide the valve core assembly 4 during axial movement. In this case, the surface of the stopper 9 near the valve core 41 is the inner wall 91. The inner wall 91 can be a smooth surface, i.e., a smooth surface with a low friction coefficient to reduce friction. When the fluid or the valve core assembly 4 passes through the stopper 9, the fluid can flow along the smooth surface, or the valve core 41 can slide in contact with the smooth surface to reduce noise. The valve core 41 can be configured as a cylindrical structure, i.e., the outer wall of the valve core 41 is a curved surface. In order to better guide the valve core assembly 4, the inner wall 91 of the stopper 9 near the valve core 41 can be configured as a curved surface. Of course, the inner wall 91 can also be a flat surface. The surface of the stopper 9 close to the conducting hole 3 b is an outer wall 92 , and the outer wall 92 may also be a curved surface or a flat surface.

[0063] You can continue to refer to Figure 13-16 understand, Figure 13 This is a schematic diagram of the first structure of the stopper 9 in the embodiment of the present application; Figure 14 This is a schematic diagram of the second structure of the stopper 9 in the embodiment of the present application; Figure 15 This is a third structural diagram of the stopper 9 in the embodiment of the present application; Figure 16 This is a fourth structural diagram of the stopper 9 in the embodiment of the present application.

[0064] Figure 13 In the embodiment, the stopper 9 is a rectangular columnar structure, and the cross section along the axial direction is a rectangle; Figure 14 In the embodiment, the stopper 9 is a cylindrical structure with a recessed inner wall 91, and the recessed portion forms an arc surface, which can be in contact with the outer wall of the valve core 41, or can have a gap with the outer wall of the valve core 41 to form an arc-shaped third flow channel 3h; Figure 15 In the embodiment, the stopper 9 is a rectangular columnar structure, except that the inner side wall 91 near the valve core assembly 4 is a concave arc surface, which can be in contact with the outer side wall of the valve core 41, or it can be a gap with the valve core 41 to form an arc-shaped third flow channel 3h; Figure 16 In the embodiment, the stopper 9 is a semi-cylindrical structure. The inner sidewall 91 adjacent to the valve core assembly 4 is a flat surface, creating a gap between the stopper 9 and the valve core assembly 4 to form a third flow channel 3h. The other side of the stopper 9 opposite the flat surface is an arcuate surface, forming an arc-shaped second flow channel 3e with the guide hole 3b. Any of these structures can serve as the stopper 9, as long as they can block the passage 3b and the valve core assembly 4. This embodiment does not limit the specific structure of the stopper 9.

[0065] Please continue to refer to Figure 17 、 18 , Figure 17 This is a schematic structural diagram of the cooperation between the valve core assembly 4 and the valve seat 3 in the second embodiment of the present application; Figure 18 for Figure 17 Schematic diagram from the perspective of the three-dimensional structure.

[0066] The structure of the valve device 300 in the second embodiment is substantially the same as that of the valve device 300 in the above embodiment, except that: Figure 12 The stopper 9 is connected to the bottom wall 32 of the valve seat 3 at the lower end, and Figure 17 、 18 The stopper 9 is connected at its upper end to the top wall 31 of the valve seat 3, and a gap is left between its lower end and the bottom wall 32 of the valve seat 3 to form a first flow channel 3c. That is, the first flow channel 3c can be reserved above or below the stopper 9. Similarly, the connection method between the upper end of the stopper 9 and the top wall 31 of the valve seat 3 is, for example, welding, and the stopper 9 can be made of brass, which is the same as the above embodiment and will not be repeated here.

[0067] like Figure 19 As shown, Figure 19 This is a schematic diagram of another configuration of the stopper 9 and the valve core assembly 4 in the second embodiment of the present application. The stopper 9 engages with the valve core assembly 4, eliminating the need for the third flow channel 3h. This provides guidance for the axial movement of the valve core assembly 4 while preventing fluid from impacting the valve core assembly 4.

[0068] Please continue to refer to Figure 20 、 21 , Figure 21 This is a schematic structural diagram of the cooperation between the valve core assembly 4 and the valve seat 3 in the third embodiment of the present application; Figure 21 for Figure 20 Schematic diagram from the perspective of the three-dimensional structure.

[0069] The valve device 300 in this embodiment has a substantially identical structure to the two aforementioned embodiments, differing in that, in the third embodiment, both ends of the stopper 9 along the axial direction are disposed on the valve seat 3. Specifically, the upper end of the stopper 9 is connected to the top wall 31 of the valve seat 3, and the lower end of the stopper 9 is connected to the bottom wall 32 of the valve seat 3. In this embodiment, the stopper 9 has channels on both sides along the circumference, connecting the second flow channel 3e between the stopper 9 and the guide hole 3b. This allows fluid to flow circumferentially from both sides of the stopper 9 toward the valve port 3a. Specifically, some fluid can flow between the stopper 9 and the valve core 41 and then toward the valve port 3a, preventing the fluid from impacting the valve core assembly 4. In this embodiment, since the first flow channel 3c is not defined between the upper and lower ends of the stopper 9 and the valve seat 3, the stopper 9 and the valve core 41 can directly contact and engage with each other, eliminating the need for the third flow channel 3h. Alternatively, a gap between the stopper 9 and the outer wall of the valve core 41 is also acceptable.

[0070] In the present application, the number of the via hole 3b may be one or more than two.

[0071] This document uses specific examples to illustrate the principles and implementation methods of this application. The description of the above examples is only intended to help understand the method and core ideas of this application. It should be noted that for those skilled in the art, without departing from the principles of this application, various improvements and modifications can be made to this application, and such improvements and modifications also fall within the scope of protection of the claims of this application.

Claims

1. A valve device, characterized in that: The invention comprises a valve seat (3) and a valve core assembly (4), wherein the valve seat (3) is provided with an accommodating cavity (3d), and the side wall of the valve seat (3) has at least one guide hole (3b) passing through the inside and outside thereof, wherein the guide hole (3b) is in communication with the accommodating cavity (3d), and the valve seat (3) is also provided with a valve port (3a); the valve core assembly (4) comprises a valve core (41), wherein at least a portion of the valve core (41) is located in the accommodating cavity (3d), and the valve core (41) is capable of axial movement to approach or move away from the valve port (3a); The valve device (300) further comprises a stopper (9), the stopper (9) being located in the accommodating cavity (3d), the stopper (9) being located on a side of the guide hole (3b) close to the accommodating cavity (3d), and projected along the axial direction of the valve seat (3), the projection surface of the stopper (9) being located between the projection surface of the valve core assembly (4) and the projection surface of the hole wall corresponding to the guide hole (3b); The stopper (9) has an inner wall (91) facing the valve core (41) and an outer wall (92) facing away from the valve core (41), the inner wall (91) is away from the guide hole (3b) relative to the outer wall (92), and the distance between the inner wall (91) and the axis (X) of the valve seat (3) is greater than or equal to the outer radius of the valve core (41).

2. The valve device according to claim 1, characterized in that Projected along the axial direction of the conducting hole (3b), the projection surface of the hole wall corresponding to the conducting hole (3b) is a first projection surface (3bs), the projection surface of the stopper (9) is a second projection surface (9s), and both sides of the first projection surface (3bs) in the width direction coincide with both sides of the second projection surface (9s) in the width direction, or both sides of the first projection surface in the width direction are located on the second projection surface (9s).

3. The valve device according to claim 2, characterized in that The width of the second projection surface (9s) is smaller than the outer diameter of the valve core (41).

4. The valve device according to claim 1, characterized in that A second flow channel (3e) is provided between the stopper (9) and the conducting hole (3b); One axial end of the stopper (9) is arranged on the valve seat (3), and the other axial end of the stopper (9) and the valve seat (3) have a first flow channel (3c) in the axial direction, and the first flow channel (3c) is connected to the second flow channel (3e), and the stopper (9) has channels on both sides along the circumferential direction, and the channels are connected to the second flow channel (3e); or, both axial ends of the stopper (9) are arranged on the valve seat (3), and the stopper (9) has channels on both sides along the circumferential direction, and the channels are connected to the second flow channel (3e).

5. The valve device according to claim 4, characterized in that The valve seat (3) comprises a first hole (3g) distributed along the axial direction, the accommodating cavity (3d), and a valve port (3a); at least a portion of the valve core (41) is located in the first hole (3g) and the accommodating cavity (3d); and a hole wall corresponding to the first hole (3g) is in sliding engagement with an outer side wall of the valve core (41); One axial end of the stopper (9) is arranged on the top wall (31) or the bottom wall (32) corresponding to the accommodating cavity (3d); or the two axial ends of the stopper (9) are respectively arranged on the top wall (31) and the bottom wall (32).

6. The valve device according to claim 5, characterized in that The stopper (9) is welded to the valve seat (3), or forms an integral structure with the valve seat (3).

7. The valve device according to claim 6, characterized in that The material of the stopper (9) is brass.

8. The valve device according to any one of claims 1 to 7, characterized in that: There is a gap between the stopper (9) and the outer side wall of the valve core (41), or the outer side wall of the valve core (41) can contact the stopper (9).

9. The valve device according to any one of claims 1 to 7, characterized in that: The inner side wall (91) is a curved surface or a straight surface.

10. The valve device according to claim 9, characterized in that The outer side wall (92) is a curved surface or a straight surface.

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