Valve element assembly, one-way valve and refrigeration equipment

Abstract

The utility model discloses a valve element assembly, a one-way valve and refrigeration equipment, and relates to the technical field of fluid control components, the valve element assembly is used for the one-way valve, the valve element assembly comprises a valve cover and a valve element, the valve cover comprises a blanking cap and a guide shaft, and the blanking cap is connected to one end of the guide shaft in the axial direction; the valve element comprises a rod body and a piston part arranged at one end of the rod body, the valve element can move relative to the guide shaft in the axial direction of the guide shaft, and the end, away from the piston part, of the rod body can be in limiting fit with the blanking cap or the guide shaft so as to prevent the valve element from slipping off from the valve deck when the valve element moves away from the valve deck. According to the technical scheme, one end of the guide shaft is connected to the blanking cap, and the guide shaft is used for guiding the movement of the valve element, so that a guide part for guiding the movement of the valve element does not need to be machined on the blanking cap in a material cutting mode, the size and machining materials of the blanking cap are reduced, the machining difficulty is reduced, and the machining efficiency is improved. And the machining cost of the one-way valve is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of fluid control components, and particularly relates to a valve core assembly, a check valve and a refrigeration device. Background Art

[0002] In a refrigeration system, a check valve is widely used to control the refrigerant to flow in a specific direction. The valve core assembly is a key component of the check valve, and the opening and closing state of the valve port of the check valve is controlled by controlling the up and down movement of the valve core assembly.

[0003] In related technologies and solutions, the guiding part of the valve core of the check valve needs to be processed by cutting materials from a metal plug cover. The guiding part is generally a cavity for the valve stem to move. Therefore, not only the materials outside the guiding part need to be cut, but also the cavity needs to be processed. When the valve port is fully open, the guiding stroke on the plug cover is long, and the guiding part to be processed is also longer, resulting in a large volume of the plug cover, a large amount of processed and cut materials, and a high processing difficulty, thus leading to a high processing cost. Summary of the Utility Model

[0004] The main purpose of the utility model is to provide a valve core assembly, a check valve and a refrigeration device, aiming to reduce the processing cost of the check valve.

[0005] To achieve the above purpose, the valve core assembly proposed by the utility model is used for a check valve, and the valve core assembly includes:

[0006] A valve cover, including a plug cover and a guiding shaft, the plug cover is connected to one end of the guiding shaft in the axial direction; and

[0007] A valve core, including a rod body and a piston part arranged at one end of the rod body, the valve core can move relative to the guiding shaft along the axial direction of the guiding shaft, and one end of the rod body far from the piston part can be limited and adapted to the plug cover or the guiding shaft to prevent the valve core from slipping off the valve cover when moving away from the valve cover.

[0008] In an embodiment, the plug cover is formed with a receiving cavity, the inner peripheral wall of the receiving cavity forms a first limiting step at one end close to the valve core, the rod body passes through the receiving cavity, and a first clamping protrusion capable of being limited and adapted to the first limiting step is arranged on the outer peripheral wall of the rod body.

[0009] In an embodiment, the rod body includes a plurality of first rod parts, the plurality of first rod parts are arranged at intervals along the circumferential direction of the piston part, the first clamping protrusion is arranged on the outer side of one end of the first rod part far from the piston part, and the plurality of first rod parts can elastically deform along the radial direction of the piston part at the end provided with the first clamping protrusion.

[0010] In one embodiment, the rod body further includes a first connecting portion disposed between two adjacent first rod portions. The valve core assembly further includes a first elastic member sleeved on the outer periphery of the guiding shaft, with one end abutted against the plug cover and the other end abutted against the first connecting portion.

[0011] In one embodiment, the first connecting portion is arc-shaped.

[0012] In one embodiment, the first connecting portion is disposed on the inner peripheral side of the plurality of first rod portions.

[0013] In one embodiment, a first limiting convex portion is provided at the edge of the first limiting step, protruding radially along the guiding shaft, and the first limiting convex portion is disposed between two adjacent first rod portions.

[0014] In one embodiment, a through hole is provided at the edge of the first limiting step, and the through hole is disposed at one end of the first limiting convex portion in the circumferential direction of the first limiting step.

[0015] In one embodiment, the first clamping convex extends along the circumferential direction of the rod body.

[0016] In one embodiment, a second limiting step is provided on the outer peripheral wall of the end of the guiding shaft away from the plug cover. The rod body is of a hollow structure, and a second clamping convex capable of being in limiting fit with the second limiting step is provided on the inner peripheral wall of the rod body.

[0017] In one embodiment, the rod body includes a plurality of second rod portions spaced apart along the circumferential direction of the piston portion to form the hollow structure. The second clamping convex is provided on the inner side of the end of the second rod portion away from the piston portion. The valve core assembly further includes a second elastic member sleeved on the outer peripheries of the guiding shaft and the rod body, with one end abutted against the plug cover and the other end abutted against the piston portion.

[0018] In one embodiment, the rod body further includes a plurality of second connecting portions. Adjacent second rod portions are connected by the second connecting portions. A second limiting convex portion extending along the axial direction of the rod body is provided on the inner peripheral wall of the second connecting portion, and a first groove adapted to the second limiting convex portion is provided on the outer peripheral wall of the guiding shaft.

[0019] In one embodiment, the plug cover and the guiding shaft are integrally formed by injection molding.

[0020] In one embodiment, the plug cover and the guiding shaft are in interference fit and / or welded.

[0021] The present utility model also provides a one-way valve, which includes a valve body and the aforementioned valve core assembly. The valve body has an inner cavity, a valve port and a port that communicate with the inner cavity. The plug is arranged at the port. The guide shaft and the valve core are arranged in the inner cavity. The valve core can move axially along the guide shaft to open or close the valve port.

[0022] In one embodiment, a butting convex part corresponding to the guide shaft is arranged on one side surface of the piston part facing the guide shaft. When the valve port is opened, the butting convex part abuts against the guide shaft.

[0023] In one embodiment, a second groove extending axially along the outer peripheral wall of the guide shaft is arranged, and the second groove communicates with the inner cavity.

[0024] The present utility model also provides a refrigeration device, which includes the aforementioned one-way valve.

[0025] The technical solution of the present utility model connects one end of the guide shaft to the plug, and uses the guide shaft to provide guidance for the movement of the valve core. Thus, there is no need to process a guiding part for the guiding movement of the valve core on the plug by cutting materials, which not only reduces the volume and processing materials of the plug, but also reduces the processing difficulty, and further reduces the processing cost of the one-way valve. At the same time, the rod body of the valve core forms a limiting fit with the plug or the guide shaft to prevent the valve core from slipping off the valve cover, thereby ensuring the stability and reliability of the structure of the one-way valve. Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0027] Figure 1 It is a sectional view of an embodiment of the one-way valve provided by the present utility model;

[0028] Figure 2 For Figure 1 it is a sectional view of the valve core assembly in

[0029] Figure 3 For Figure 2 it is a schematic structural view of the valve core in

[0030] Figure 4 For Figure 2 it is a bottom view of the plug in

[0031] Figure 5 It is a sectional view of another embodiment of the one-way valve provided by the present utility model;

[0032] Figure 6 is Figure 5 a sectional view of the spool assembly in

[0033] Figure 7 is Figure 5 a schematic structural view of the spool in

[0034] Figure 8 is Figure 5 a schematic structural view of the valve cover in

[0035] Figure 9 is Figure 8 a sectional view of the valve cover in

[0036] Figure 10 is Figure 5 a sectional view of the limiting fit between the rod body and the guide shaft in

[0037] Explanation of the reference numerals in the drawings:

[0038] 10. Spool assembly; 20. Valve body; 201. Inner cavity; 202. Port; 203. Valve port; 100. Valve cover; 200. Spool; 300. First elastic member; 400. Second elastic member; 110. Plug; 111. Accommodating cavity; 112. First limiting step; 1121. First limiting protrusion; 1122. Through hole; 120. Guide shaft; 121. Second limiting step; 122. First groove; 123. Second groove; 210. Rod body; 211. First clamping protrusion; 212. First rod portion; 213. First connecting portion; 214. Second clamping protrusion; 215. Second rod portion; 216. Second connecting portion; 217. Second limiting protrusion; 220. Piston portion; 221. Abutting protrusion.

[0039] The realization, functional features and advantages of the purpose of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0040] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts fall within the protection scope of the present utility model.

[0041] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, then such directional indications are only used to explain the relative positional relationship, movement conditions, etc. between components in a certain specific posture. If this specific posture changes, then the directional indications will also change accordingly.

[0042] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, then such descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes Scenario A, or Scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0043] The present utility model provides a spool assembly 10.

[0044] Please refer to Figure 2 and Figure 6 , in an embodiment of the present utility model, the spool assembly 10 is used for a check valve. The spool assembly 10 includes a valve cover 100 and a spool 200. The valve cover 100 includes a plug cover 110 and a guide shaft 120. The plug cover 110 is connected to one end of the guide shaft 120 in the axial direction. The spool 200 includes a rod body 210 and a piston portion 220 provided at one end of the rod body 210. The spool 200 can move relative to the guide shaft 120 along the axial direction of the guide shaft 120. One end of the rod body 210 away from the piston portion 220 can be limited and adapted to the plug cover 110 or the guide shaft 120 to prevent the spool 200 from slipping off the valve cover 100 when moving away from the valve cover 100.

[0045] Specifically, the valve cover 100 is installed on the valve body 20 of the check valve, and the spool 200 is installed inside the valve body 20 for opening or closing the valve port 203. The valve cover 100 includes a plug cover 110 and a guide shaft 120. The function of the guide shaft 120 is to provide guidance for the spool 200 to ensure that the spool 200 can move accurately and smoothly along the axial direction of the guide shaft 120 during the movement process, avoiding deviation and jamming. The spool 200 includes a rod body 210 and a piston portion 220. The piston portion 220 is provided at one end of the rod body 210. When the fluid pressure acts on the piston portion 220, it pushes the spool 200 to move along the axial direction of the guide shaft 120 to achieve the opening or closing of the valve port 203.

[0046] Please refer to Figure 1 and Figure 2 One end of the rod body 210 is connected to the piston portion 220, and the other end forms a limiting fit with the plug cover 110. When the valve core 200 moves away from the plug cover 110 to a predetermined position, a part of the structure of the rod body 210 is abutted by the plug cover 110 to form a limiting fit with the rod body 210, so as to block the valve core 200 from continuing to move away from the plug cover 110, thereby preventing the valve core 200 from slipping off the plug cover 110, and further ensuring the stability and reliability of the one-way valve structure.

[0047] Please refer to Figure 5 and Figure 6 One end of the rod body 210 is connected to the piston portion 220, and the other end forms a limiting fit with the guide shaft 120. When the valve core 200 moves away from the plug cover 110 to a predetermined position, the outer peripheral wall of the guide shaft 120 abuts a part of the structure of the rod body 210 to form a limiting fit with the rod body 210, so as to block the valve core 200 from continuing to move away from the plug cover 110, thereby preventing the valve core 200 from slipping off the guide shaft 120, and further ensuring the stability and reliability of the one-way valve structure.

[0048] By forming a limiting fit between the other end of the rod body 210 and the plug cover 110 or the guide shaft 120, it can effectively prevent the valve core 200 from detaching from the valve cover 100 under the action of reverse pressure, ensuring the stability and reliability of the one-way valve. By connecting one end of the guide shaft 120 to the plug cover 110, the guide shaft 120 can provide guidance for the movement of the valve core 200. Since the processing of the guide shaft 120 is simpler, a standardized guide shaft 120 can be directly processed and then assembled with the plug cover 110; or it can be directly injection-molded integrally with the plug cover 110, so that there is no need to process a guiding portion for the valve core 200 to move on the plug cover 110 by cutting materials, which not only reduces the volume and processing materials of the plug cover 110, but also reduces the processing difficulty, and further reduces the processing cost of the one-way valve.

[0049] The technical solution of the present utility model connects one end of the guide shaft 120 to the plug cover 110 and uses the guide shaft 120 to provide guidance for the movement of the valve core 200, so that there is no need to process a guiding portion for the valve core 200 to move on the plug cover 110 by cutting materials, which not only reduces the volume and processing materials of the plug cover 110, but also reduces the processing difficulty, and further reduces the processing cost of the one-way valve. At the same time, by forming a limiting fit between the rod body 210 of the valve core 200 and the plug cover 110 or the guide shaft 120, the valve core 200 is prevented from slipping off the valve cover 100, thereby ensuring the stability and reliability of the one-way valve structure.

[0050] In an embodiment, please refer to Figure 2, the plug cover 110 forms a receiving cavity 111. The inner peripheral wall of the receiving cavity 111 forms a first limiting step 112 at one end close to the valve core 200. The rod body 210 is disposed through the receiving cavity 111, and a first clamping protrusion 211 adapted to be limited with the first limiting step 112 is provided on the outer peripheral wall of the rod body 210.

[0051] A receiving cavity 111 is formed inside the plug cover 110. The receiving cavity 111 provides a moving space for the rod body 210 and a suitable position for the first limiting step 112. The first limiting step 112 is an annular protrusion or platform for cooperating with the first clamping protrusion 211 on the valve core 200 to play a limiting role. The first clamping protrusion 211 is disposed on the outer peripheral wall of the rod body 210 and matches the first limiting step 112. When the piston portion 220 opens the valve port 203, the rod body 210 can smoothly move within the receiving cavity 111; when the valve core 200 moves to a predetermined position point and the piston portion 220 closes the valve port 203, the first clamping protrusion 211 will contact the first limiting step 112 and prevent the valve core 200 from further moving, preventing the displacement of the valve core 200 caused by accidental impact or vibration, thereby maintaining the valve core 200 in the correct position, ensuring the normal opening or closing of the valve port 203, and improving the reliability of the entire valve core assembly 10.

[0052] The limiting mechanism realized by the cooperation of the first limiting step 112 and the first clamping protrusion 211 not only ensures the accurate position of the valve core 200 during the working process, but also enhances the stability and reliability of the valve core assembly 10. Especially under high-pressure or frequent switching working conditions, it can effectively prevent the accidental movement of the valve core 200 and ensure the working safety and efficiency of the fluid control system.

[0053] In an embodiment, please refer to Figure 3 , the rod body 210 includes a plurality of first rod portions 212. The plurality of first rod portions 212 are arranged at intervals along the circumferential direction of the piston portion 220. The first clamping protrusion 211 is provided on the outer side of one end of the first rod portion 212 far from the piston portion 220. The plurality of first rod portions 212 can elastically deform along the radial direction of the piston portion 220 at the end provided with the first clamping protrusion 211.

[0054] A plurality of first rod portions 212 are arranged at intervals along the circumferential direction of the piston portion 220 and form a receiving groove for the guide shaft 120 to penetrate into. When the plurality of first rod portions 212 move along the outer peripheral wall of the guide shaft 120, correspondingly, the guide shaft 120 also moves in the receiving groove in the opposite direction. A first convex 211 is provided on the outer side of each first rod portion 212 at the end far from the piston portion 220, so that the plurality of first convexes 211 are arranged at intervals along the circumferential direction of the rod body 210, so that the plurality of first convexes 211 can more stably achieve limit fit with the annular first limit step 112. The fluid in the receiving groove can flow between the first rod portions 212 arranged at intervals to realize the inflow and outflow of the fluid in the receiving cavity 111 and the receiving groove.

[0055] During the assembly process of the valve cover 100 and the valve core 200, when the rod body 210 penetrates into the receiving cavity 111, since the first rod portions 212 can elastically deform in the radial direction, the plurality of first rod portions 212 can contract towards the center and can easily penetrate into the receiving cavity 111, reducing the assembly difficulty, saving time, and at the same time facilitating subsequent inspection and replacement, making the assembly and maintenance of the valve core assembly 10 easier. When the first convex 211 is in limit fit with the first limit step 112, the elastic deformation of the plurality of first rod portions 212 can generate an outward expanding elastic force, which helps to enhance the limit effect between the first convex 211 and the plug cover 110, thereby improving the reliability of the valve core assembly 10.

[0056] In addition, when the valve core 200 moves on the guide shaft 120, the first rod portion 212 can elastically deform in the radial direction of the piston portion 220, which can help the valve core 200 better adapt to the minute unevenness or deviation on the guide shaft 120, improving the guiding accuracy and stability. When the first rod portion 212 bears external impact or vibration, it can absorb part of the energy through its own deformation, reducing the damage to the overall structure of the valve core 200 and extending the service life of the valve core assembly 10.

[0057] In an embodiment, please refer to Figure 2 and Figure 3 , the rod body 210 further includes a first connecting portion 213, the first connecting portion 213 is arranged between two adjacent first rod portions 212, the valve core assembly 10 further includes a first elastic member 300, the elastic member is sleeved on the outer periphery of the guide shaft 120, one end abuts against the plug cover 110, and the other end abuts against the first connecting portion 213.

[0058] The first connecting portion 213 connects two adjacent independent first rod portions 212 to form a more stable overall structure, improving the ability of the valve core assembly 10 to resist external impacts and vibrations. At the same time, the first connecting portion 213 also provides a fixed abutting point and a supporting point for the first elastic member 300. The first connecting portion 213 can be disposed on the connection line between two adjacent first rod portions 212, and the first connecting portion 213 is flush with the first rod portion 212 or protrudes from the first rod portion 212, so that the end of the first elastic member 300 can abut against the first connecting portion 213. The first connecting portion 213 can also be disposed on the inner peripheral side of a plurality of first rod portions 212.

[0059] The first elastic member 300 is used to provide a restoring force. When the valve core 200 moves toward the valve cover 100 under the action of an external force (the pressure of the fluid medium), the first elastic member 300 will be compressed and store a certain amount of elastic potential energy. Once the external force disappears, the first elastic member 300 will release this part of the energy, prompting the valve core 200 to return to its original position to achieve automatic reset. At the same time, the first elastic member 300 can also absorb and buffer the impact force generated during the rapid movement of the valve core 200, reduce the wear of the valve core assembly 10 and other components, and extend the service life.

[0060] In an embodiment, please refer to Figure 3 , the first connecting portion 213 is arc-shaped.

[0061] The first connecting portion 213 being arc-shaped can be adapted to the outer shape of the guide shaft 120 to facilitate the relative movement of the rod body 210 and the guide shaft 120. The arc-shaped structure can better disperse stress and avoid stress concentration at the first connecting portion 213. When bearing a load or being subjected to an external force, the arc-shaped first connecting portion 213 can distribute these forces more evenly, thereby reducing the risk of fatigue and fracture of the rod body 210. Compared with a straight connecting portion, the arc-shaped first connecting portion 213 can more effectively resist bending and torsion, so that the rigidity of the overall structure can be improved without increasing additional weight. In addition, the one-way valve is applied to a fluid system, and the first connecting portion 213 is located in the fluid flow path for a long time. Especially during the process of opening and closing the valve port 203, the accommodating groove formed by the first rod portion 212 and the first connecting portion 213 will be filled with and discharged of fluid. The arc-shaped design of the first connecting portion 213 helps to reduce the fluid resistance and the generation of eddy currents during this process, improve the smoothness of fluid passage, reduce noise, and at the same time reduce energy loss.

[0062] In an embodiment, please refer to Figure 3 , the first connecting portion 213 is disposed on the inner peripheral side of a plurality of first rod portions 212.

[0063] The first connecting portion 213 may be flush with the first rod portion 212, may protrude from the first rod portion 212, or the first rod portion 212 may protrude from the first connecting portion 213. When the first rod portion 212 protrudes from the first connecting portion 213, the material used for the first connecting portion 213 can be saved, thereby reducing the production cost; the protruding portion of the first rod portion 212 from the first connecting portion 213 can limit the first elastic member 300, making the installation of the first elastic member 300 more reliable. Since the first connecting portion 213 is provided on the inner peripheral side of a plurality of first rod portions 212, the accommodating groove forms a connected first guiding section and second guiding section. The first guiding section is formed by the protruding plurality of first rod portions 212, and the second guiding section is formed by the spaced first connecting portions 213, and the diameter of the second guiding section is smaller than that of the first guiding section. Therefore, the second guiding section can prevent the guiding shaft 120 from shifting, making the movement of the valve core 200 smoother and more stable during the movement process.

[0064] In an embodiment, please refer to Figure 4 , a first limiting protrusion 1121 is provided on the edge of the first limiting step 112. The first limiting protrusion 1121 protrudes along the radial direction of the guiding shaft 120, and the first limiting protrusion 1121 is provided between two adjacent first rod portions 212.

[0065] The first limiting protrusion 1121 is an arc segment that protrudes along the radial direction of the guiding shaft 120 and extends in the circumferential direction of the first limiting step 112. It can be understood that the straight-line distance from the edge of the first limiting protrusion 1121 to the axis of the guiding shaft 120 is D 1 , the straight-line distance from the edge of the first limiting step 112 to the axis of the guiding shaft 120 is D 2 , D 1 <D 2 . The first limiting protrusion 1121 protrudes along the radial direction of the guiding shaft 120 and is provided between two adjacent first rod portions 212. The first limiting protrusion 1121 generates a circumferential limit on the first rod portion 212, thereby effectively restricting the valve core 200 from rotating when subjected to a lateral force in the circumferential direction, and further reducing the noise during the use of the one-way valve.

[0066] In other embodiments, the first limiting protrusion 1121 may also be a limiting structure that protrudes along the axial direction of the guiding shaft 120. In this embodiment, the first limiting protrusion 1121 generates a circumferential limit on the first clamping protrusion 211, thereby preventing the valve core 200 from rotating.

[0067] In an embodiment, please refer to Figure 4 , a through hole 1122 is provided on the edge of the first limiting step 112. The through hole 1122 is provided at one end of the first limiting protrusion 1121 in the circumferential direction of the first limiting step 112.

[0068] During the machining process, a circular tool is generally used, and a through hole 1122 is provided for the tool to pass through, so as to facilitate the removal of the material inside the plug cover 110. At the same time, the powder debris of the removed material can also be discharged from the through hole 1122. In addition, the through hole 1122 can also play a role in guiding the auxiliary fluid. When the valve core 200 moves toward the plug cover 110, the fluid in the accommodating chamber 111 flows out from between the first rod portions 212 arranged at intervals, and the through hole 1122 can also serve as a small channel to help discharge the fluid inside the accommodating chamber 111. Two through holes 1122 can be provided, and the two through holes 1122 are respectively provided at the two ends of the first limiting protrusion 1121 on the circumference of the first limiting step 112.

[0069] In one embodiment, the first locking protrusion 211 extends along the circumference of the rod body 210 .

[0070] The first clamping protrusion 211 extends along the circumference of the rod body 210, and the first clamping protrusion 211 can provide an all-round limiting effect. When the valve core assembly 10 moves to a predetermined position, the contact surface between the first clamping protrusion 211 and the first limiting step 112 is larger, which can limit the position of the valve core 200 from all angles, ensuring that it can remain stable when subjected to pressure or vibration from different directions. The large-area contact between the first clamping protrusion 211 extending circumferentially and the first limiting step 112 can disperse the stress of the contact point, reduce local wear, and extend the service life of the valve core assembly 10. In addition, the evenly distributed contact pressure also helps to maintain the performance consistency of the valve core assembly 10 after long-term operation. The design of the first clamping protrusion 211 extending circumferentially can simplify the processing of the valve core assembly 10. Compared with the need to set the first clamping protrusion 211 at multiple positions, the circumferentially continuous first clamping protrusion 211 can reduce the complexity of the design, and it is also easier to achieve consistency and precision during the manufacturing process. The end of the rod body 210 provided with the first locking protrusion 211 can be elastically deformed along the radial direction of the piston portion 220 , so that the rod body 210 and the first locking protrusion 211 can be installed into the accommodating cavity 111 .

[0071] In one embodiment, see Figure 6 , Figure 7 and Figure 9 A second limiting step 121 is provided on the outer peripheral wall of the end of the guide shaft 120 away from the blocking cover 110 . The rod body 210 is a hollow structure, and a second locking protrusion 214 capable of limiting and adapting to the second limiting step 121 is provided on the inner peripheral wall of the rod body 210 .

[0072] The rod body 210 has a hollow structure. During the movement of the valve core 200 along the guide shaft 120, it also provides a space for the guide shaft 120 to move and a suitable position for the second convex 214, so that the second convex 214 is arranged on the inner peripheral wall of the rod body 210, facilitating the limit fit between the second limit step 121 and the second convex 214, thereby effectively defining the limit position of the valve core 200 moving axially away from the plug 110 along the guide shaft 120.

[0073] When the piston part 220 opens the valve port 203, the rod body 210 can move smoothly along the axial direction of the guide shaft 120; when the valve core 200 moves to the pre-position point and the piston part 220 closes the valve port 203, the second convex 214 will contact the second limit step 121 and prevent the valve core 200 from further moving, preventing the displacement of the valve core 200 caused by accidental impact or vibration, thereby keeping the valve core 200 in the correct position, ensuring the normal opening or closing of the valve port 203, and improving the reliability of the entire valve core assembly 10.

[0074] The limit mechanism realized by the cooperation of the second limit step 121 and the second convex 214 not only ensures the accurate position of the valve core 200 during operation, but also enhances the stability and reliability of the valve core assembly 10. Especially under high-pressure or frequent switching working conditions, it can effectively prevent the accidental movement of the valve core 200 and ensure the working safety and efficiency of the fluid control system.

[0075] Since the second limit step 121 is arranged on the guide shaft 120, therefore, the plug 110 in this embodiment may not form a cavity, and the thickness of the plug 110 is adapted to the thickness of the valve body 20 to achieve the sealed connection between the plug 110 and the valve body 20. The plug 110 may also form a cavity. While achieving the sealed connection between the plug 110 and the valve body 20, the size and material of the plug 110 can be reduced, and the weight of the plug 110 can be reduced.

[0076] In one embodiment, please refer to Figure 6 and Figure 7 , the rod body 210 includes a plurality of second rod parts 215. The plurality of second rod parts 215 are arranged at intervals along the circumferential direction of the piston part 220 to form a hollow structure. The second convex 214 is arranged on the inner side of one end of the second rod part 215 far from the piston part 220; the valve core assembly 10 further includes a second elastic member 400. The elastic member is sleeved on the outer peripheries of the guide shaft 120 and the rod body 210, with one end abutting against the plug 110 and the other end abutting against the piston part 220.

[0077] The plurality of second rod portions 215 are arranged at intervals along the circumference of the piston portion 220 to form a hollow structure. When the plurality of second rod portions 215 move along the outer peripheral wall of the guide shaft 120, the guide shaft 120 also moves in the opposite direction in the hollow structure accordingly. Each second rod portion 215 is provided with a second locking protrusion 214 on the inner side of one end away from the piston portion 220, so that the plurality of second locking protrusions 214 are arranged at intervals along the circumference of the rod body 210, so that the plurality of second locking protrusions 214 can correspond to the second limiting step 121 one by one to achieve a more stable limiting fit.

[0078] The second elastic member 400 is used to provide a restoring force. When the valve core 200 moves toward the valve cover 100 under the action of an external force (pressure of the fluid medium), the second elastic member 400 will be compressed and store a certain amount of elastic potential energy. Once the external force disappears, the second elastic member 400 will release this part of energy, causing the valve core 200 to return to its original position and achieve automatic reset. At the same time, the second elastic member 400 can also absorb and buffer the impact force generated by the valve core 200 during rapid movement, reduce the wear on the valve core assembly 10 and other components, and extend the service life.

[0079] In one embodiment, see Figure 7 , Figure 8 and Figure 10 The rod body 210 also includes a plurality of second connecting portions 216, and two adjacent second rod portions 215 are connected via the second connecting portion 216. The inner peripheral wall of the second connecting portion 216 is provided with a second limiting protrusion 217, and the second limiting protrusion 217 extends along the axial direction of the rod body 210. The outer peripheral wall of the guide shaft 120 is provided with a first groove 122 adapted to the second limiting protrusion 217.

[0080] The second connecting portion 216 connects two adjacent independent second rod portions 215 to form a more stable overall structure, thereby improving the ability of the valve core assembly 10 to resist external impact and vibration. The second connecting portion 216 can be arranged on the connecting line between two adjacent second rod portions 215, or on the outer peripheral side of multiple second rod portions 215.

[0081] The inner circumferential wall of the second connecting portion 216 is provided with at least one second limiting protrusion 217, and the second limiting protrusion 217 is limited in the first groove 122, so that the guide shaft 120 can limit the second rod portion 215 in the circumferential direction, thereby effectively limiting the rotation of the valve core 200 when it is subjected to lateral force in the circumferential direction, thereby reducing the noise of the one-way valve during use.

[0082] In one embodiment, see Figure 7, the second connecting part 216 is arranged on the arc path between two adjacent second rod parts 215 and is arranged in an arc shape. The arc shape of the second connecting part 216 has the same function as the arc shape of the first connecting part 213, which can be adapted to the outer shape of the guide shaft 120, disperse stress, improve structural rigidity, reduce noise, etc., and will not be elaborated here.

[0083] In one embodiment, the plug 110 and the guide shaft 120 are integrally formed by injection molding.

[0084] The plug 110 is made of metal and is formed by metal stamping. The guide shaft 120 is made of non-metal material and can be selected from plastic materials such as polytetrafluoroethylene (PTFE), nylon or polycarbonate. The plug 110 and the guide shaft 120 are integrally formed by injection molding.

[0085] The manufacturing process of integral injection molding ensures that the connection between the plug 110 and the guide shaft 120 has extremely high structural strength, eliminates the risk of connection loosening or failure caused by improper assembly or vibration during use. There are no obvious gaps or interfaces at the joint of the plug 110 and the guide shaft 120, which helps to improve the sealing performance of the valve cover 100 and reduce the risk of fluid leakage. At the same time, the high-precision characteristics of injection molding can ensure the consistency of the dimensions and shapes of the parts, which is beneficial to improving the overall precision and performance of the valve core assembly 10. Compared with the traditional method of separately manufacturing and assembling the plug 110 and the guide shaft 120, integral injection molding can save materials and processing volume, save labor costs and assembly time, and at the same time reduce the rejection rate caused by poor part alignment and fixation, thus significantly reducing the production cost. The processing of the second limit step 121, the first groove 122 and the second groove 123 can be easily realized.

[0086] In one embodiment, the plug 110 and the guide shaft 120 are in interference fit and / or welded.

[0087] The plug 110 is provided with an installation groove, and the guide shaft 120 is in interference fit with the installation groove; or the plug 110 and the guide shaft 120 are welded; or the plug 110 and the guide shaft 120 are first in interference fit through the installation groove and then welded. The plug 110 and the guide shaft 120 are fixedly connected by welding and / or interference fit, which can achieve a tight connection between the two, ensuring that the guide shaft 120 will not loosen or fall off during operation, so as to ensure the normal operation of the one-way valve.

[0088] The present utility model also proposes a one-way valve, which includes a valve body 20 and a valve core assembly 10. The specific structure of the valve core assembly 10 refers to the above embodiments. Since this one-way valve adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, and will not be elaborated one by one here.

[0089] The one-way valve proposed by the present utility model can be applied to various fluid systems that require controlling unidirectional flow, such as air-conditioning systems, hydraulic systems, and pneumatic systems. The fluid medium flowing through the one-way valve is the refrigerant used for heat and cold exchange in the air-conditioning system. The fluid medium flowing through the one-way valve can also be other fluid media other than the refrigerant, such as water or oil in the hydraulic system, or gas in the pneumatic system. As long as the one-way valve can prevent the backflow of this kind of fluid medium, there is no specific limitation on this.

[0090] Among them, the valve body 20 has an inner cavity 201, a valve port 203 communicating with the inner cavity 201, and a port 202. A plug cover 110 is provided at the port 202, and a guide shaft 120 and a valve core 200 are provided in the inner cavity 201. The valve core 200 can move axially along the guide shaft 120 to open or close the valve port 203.

[0091] Please refer to Figure 1 and Figure 5 , the cavity inside the valve body 20 provides space for the flow of fluid and the operation of the valve core assembly 10. The valve port 203, as a key interface connecting the inner cavity 201 and the external fluid pipeline, controls the flow or cut-off of the fluid through the movement of the valve core 200. The port 202 is located at one end of the valve body 20, and the valve cover 100 is installed at the port 202. The valve cover 100 is processed separately from the valve body 20 and then assembled with the valve body 20 into a complete structure to facilitate the processing of the structure on the valve cover 100. The plug cover 110, as a part of the valve body 20, also plays a role in connecting and guiding the movement of the valve core assembly 10 to ensure its accurate movement along the guide shaft 120 in the inner cavity 201. The valve core 200 can move axially along the guide shaft 120 and control the on-off of the fluid by changing its positional relationship with the valve port 203.

[0092] It can be understood that when the fluid outside the valve port 203 generates a pressure on the piston portion 220 that overcomes the elastic force of the elastic member (the first elastic member 300 or the second elastic member 400), the valve core 200 moves away from the valve port 203 and compresses the elastic member to open the valve port 203. When the acting force of the fluid outside the valve port 203 on the piston portion 220 disappears, the elastic member drives the valve core 200 to move towards the valve port 203 to close the valve port 203. At this time, the rod body 210 is in limit fit with the plug cover 110 or the guide shaft 120 to prevent the valve core 200 from slipping off the valve cover 100.

[0093] In an embodiment, please refer to Figure 2 and Figure 6 , a contact convex portion 221 is provided on the side of the piston portion 220 facing the guide shaft 120 corresponding to the guide shaft 120. When the valve port 203 is opened, the contact convex portion 221 contacts the guide shaft 120.

[0094] The area of the abutting convex portion 221 is smaller than the area of the corresponding end face of the guide shaft 120. Thus, when the abutting convex portion 221 abuts against the guide shaft 120, the contact area between the two can be reduced, and the noise generated when the abutting convex portion 221 abuts against the guide shaft 120 can be reduced. At the same time, by using the abutting convex portion 221 as the main contact point, the friction and wear between the guide shaft 120 and the piston portion 220 can be reduced. In addition, when the valve core 200 moves to the position where the valve port 203 is opened, the abutment of the abutting convex portion 221 against the guide shaft 120 can serve as a limiting mechanism to ensure that the valve core 200 precisely stays at the preset opening position, avoiding excessive movement or position drift, thereby maintaining precise control of the valve opening.

[0095] In one embodiment, please refer to Figure 8 and Figure 10 , a second groove 123 extending along the axial direction of the guide shaft 120 is provided on the outer peripheral wall of the guide shaft 120, and the second groove 123 communicates with the inner cavity 201.

[0096] During the opening or closing process of the valve, the second groove 123 helps to balance the pressures at both ends of the guide shaft 120 in the axial direction, reduce the resistance encountered when the valve core 200 moves, and can timely discharge the fluid inside the rod body 210 to ensure the smoothness and response speed of the valve action. The cross-sectional area of the second groove 123 intercepted by a plane perpendicular to the axial direction of the guide shaft 120 is not less than 1 mm 2 , so that the fluid inside the rod body 210 can be quickly discharged. The second groove 123 can be provided with one or multiple.

[0097] The present utility model also proposes a refrigeration device, which includes a check valve. The specific structure of the check valve refers to the above embodiments. Since the refrigeration device adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated one by one here.

[0098] The above description is only an exemplary embodiment of the present utility model, and does not limit the patent scope of the present utility model. Any equivalent structural transformation made under the technical concept of the present utility model by using the content of the specification and drawings of the present utility model, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present utility model.

Claims

1. A valve core assembly for a one-way valve, characterized in that: The valve core assembly comprises: A valve cover, comprising a plug cover and a guide shaft, wherein the plug cover is connected to one axial end of the guide shaft; and The valve core includes a rod body and a piston part arranged at one end of the rod body. The valve core can move relative to the guide shaft along the axial direction of the guide shaft. The end of the rod body away from the piston part can be limitedly adapted with the blocking cover or the guide shaft to prevent the valve core from slipping off the valve cover when moving away from the valve cover.

2. The valve core assembly according to claim 1, characterized in that: The blocking cover forms a accommodating cavity, the inner peripheral wall of the accommodating cavity forms a first limiting step at one end close to the valve core, the rod body is inserted into the accommodating cavity, and the outer peripheral wall of the rod body is provided with a first clamping protrusion that can be adapted to the first limiting step.

3. The valve core assembly according to claim 2, characterized in that: The rod body includes a plurality of first rod portions, which are arranged at intervals along the circumference of the piston portion. The first rod portion is provided with the first clamping protrusion on the outer side of one end away from the piston portion. The first rod portions can be elastically deformed along the radial direction of the piston portion at one end provided with the first clamping protrusion.

4. The valve core assembly according to claim 3, characterized in that: The rod body also includes a first connecting portion, which is arranged between two adjacent first rod portions. The valve core assembly also includes a first elastic member, which is sleeved on the outer periphery of the guide shaft, with one end abutting the blocking cover and the other end abutting the first connecting portion.

5. The valve core assembly according to claim 4, characterized in that: The first connecting portion is arc-shaped; And / or, the first connection portion is arranged on the inner circumference side of the plurality of first rod portions.

6. The valve core assembly according to claim 3, characterized in that: A first limiting protrusion is provided on the edge of the first limiting step. The first limiting protrusion protrudes in the radial direction of the guide shaft. The first limiting protrusion is provided between two adjacent first rod portions.

7. The valve core assembly according to claim 6, characterized in that: A through hole is provided at the edge of the first limiting step, and the through hole is provided at one end of the first limiting protrusion in the circumferential direction of the first limiting step.

8. The valve core assembly according to claim 2, characterized in that: The first locking protrusion extends along the circumference of the rod body.

9. The valve core assembly according to claim 1, characterized in that: A second limiting step is provided on the outer peripheral wall of the end of the guide shaft away from the blocking cover, the rod body is a hollow structure, and the inner peripheral wall of the rod body is provided with a second locking protrusion that can be limitedly matched with the second limiting step.

10. The valve core assembly according to claim 9, characterized in that: The rod body includes a plurality of second rod portions, and the plurality of second rod portions are arranged at intervals along the circumference of the piston portion to form the hollow structure. The second rod portion is provided with the second latching protrusion on the inner side of one end away from the piston portion; the valve core assembly also includes a second elastic member, which is sleeved on the outer circumference of the guide shaft and the rod body, with one end abutting the blocking cover and the other end abutting the piston portion.

11. The valve core assembly according to claim 10, characterized in that: The rod body also includes a plurality of second connecting parts, and two adjacent second rod parts are connected by the second connecting parts. The inner peripheral wall of the second connecting part is provided with a second limiting protrusion, and the second limiting protrusion extends along the axial direction of the rod body. The outer peripheral wall of the guide shaft is provided with a first groove adapted to the second limiting protrusion.

12. The valve core assembly according to claim 1, characterized in that: The plug cover and the guide shaft are integrally formed by injection molding; or The plugging cover and the guide shaft are interference fit and / or welded.

13. A one-way valve, characterized in that: It includes a valve body and a valve core assembly as described in any one of claims 1 to 12, wherein the valve body has an inner cavity and a valve opening and a port connected to the inner cavity, the plug cover is arranged on the port, the guide shaft and the valve core are arranged in the inner cavity, and the valve core can move axially along the guide shaft to open or close the valve opening.

14. The one-way valve according to claim 13, characterized in that: A side surface of the piston portion facing the guide shaft is provided with an abutting convex portion corresponding to the guide shaft, and when the valve port is opened, the abutting convex portion abuts against the guide shaft.

15. The one-way valve according to claim 13, characterized in that: The outer peripheral wall of the guide shaft is provided with a second groove extending along the axial direction thereof, and the second groove is communicated with the inner cavity.

16. A refrigeration device, characterized in that: Comprising a one-way valve as claimed in any one of claims 13 to 15.

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