Valve structure

Abstract

The utility model relates to the technical field of fluid control, and discloses a valve structure which comprises a valve body, a shell, a first valve element and a second valve element, a first flow channel, a second flow channel and a mounting cavity are formed in the valve body, and the shell is arranged in the mounting cavity; the shell is provided with a first containing cavity with one open end, and the open end of the shell faces the first flow channel and the second flow channel. One end, opposite to the open end, of the shell is a closed end, and the arrangement direction of the open end and the closed end is a first direction; one end of the first valve element is inserted into the open end, and the first valve element is slidably connected with the shell in the first direction. The first valve element is provided with a through hole extending in the first direction, and the second valve element is slidably connected with the through hole in the first direction. An oil inlet hole is formed in the side wall of the first valve element and communicates with the first flow channel. According to the valve structure, the problems that a back pressure valve and an oil supplementing valve are two independent valve structures, the number of parts is large, cost is high, and miniaturization of a valve body is not facilitated are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of fluid control, in particular to a valve structure. Background Art

[0002] In traditional hydraulic systems, the back pressure valve and the oil replenishment valve are two independent valve structures, and the valve body needs to be provided with space for installing the two valve structures. On the one hand, the two valve structures have many components and high costs; on the other hand, it is not conducive to the miniaturization of the valve body. Utility Model Content

[0003] The utility model provides a valve structure, which can improve the problem that a back pressure valve and an oil replenishing valve are two independent valve structures, which have many components, high cost and are not conducive to miniaturization of the valve body.

[0004] In order to achieve the above object, the utility model provides the following technical solutions:

[0005] A valve structure includes a valve body, a shell, a first valve core and a second valve core, wherein the valve body is formed with a first flow channel, a second flow channel and a mounting cavity, and the shell is arranged in the mounting cavity; the shell has a first accommodating cavity with one end open, and the open end of the shell faces the first flow channel and the second flow channel;

[0006] The end of the housing opposite to the open end is a closed end, and the arrangement direction of the open end and the closed end is a first direction; one end of the first valve core is inserted into the open end, and the first valve core is slidably connected to the housing along the first direction; the first valve core has a through hole extending along the first direction, and the second valve core is slidably connected to the through hole along the first direction; the side wall of the first valve core is provided with an oil inlet hole, and the oil inlet hole is communicated with the first flow channel;

[0007] When the valve structure is in a natural state, the first valve core and the second valve core work together to block the communication between the first flow channel and the second flow channel; when the force of the fluid in the second flow channel acting on the first valve core and the second valve core is greater than a first preset value, the first valve core and the second valve core move toward the closed end of the shell, and the first flow channel is connected with the second flow channel; when the force of the fluid in the first flow channel acting on the second valve core through the oil inlet hole is greater than a second preset value, the second valve core moves away from the closed end of the shell, a gap is formed between the first valve core and the second valve core, and the first flow channel is connected with the second flow channel through the gap.

[0008] It can be seen that the valve structure in the present application realizes the integration of the back pressure valve and the oil replenishing valve functions through fewer components, which can not only save manufacturing costs, but also reduce the installation space required on the valve body, which is conducive to the miniaturization of the valve body. In addition, in the present application, the valve body is provided with an installation cavity for installing the valve structure; while in the related art, the back pressure valve and the oil replenishing valve are both separate structures, and the back pressure valve and the oil replenishing valve are installed separately. The valve body needs to be processed separately for installing the installation cavity of the back pressure valve and the oil replenishing valve. In comparison, the valve structure provided in the present application can reduce the installation cavity, simplify the structure of the valve body, reduce the casting difficulty and casting cost of the valve body, and reduce the pressure loss caused by more oil circuits.

[0009] Optionally, the valve structure includes a first elastic member, which is disposed in the first accommodating cavity and located on a side of the first valve core facing the closed end of the housing; one end of the first elastic member abuts against the closed end of the housing, and the other end of the first elastic member abuts against the first valve core;

[0010] When the force exerted by the fluid in the second flow channel on the first valve core and the second valve core is greater than the elastic force of the first elastic member, the first valve core and the second valve core move toward the closed end of the housing.

[0011] Optionally, a second accommodating cavity is formed at one end of the first valve core away from the closed end of the housing, and one end of the second accommodating cavity away from the closed end of the housing is open; the through hole and the oil inlet hole are both connected to the second accommodating cavity;

[0012] When the valve structure is in the natural state, the second valve core closes the open end of the second accommodating cavity.

[0013] Optionally, the side wall of the first valve core is provided with at least two oil inlet holes, wherein at least one pair of the oil inlet holes are symmetrically arranged about the axis of the first valve core.

[0014] Optionally, an end of the second valve core away from the closed end of the housing is a first free end, and a size of the first free end gradually increases along a direction from the closed end of the housing to the open end of the housing;

[0015] The end of the first valve core facing away from the closed end of the housing is the second free end. When the valve structure is in the natural state, the first free end is partially located on the side of the second free end facing the closed end of the housing.

[0016] Optionally, the first free end is truncated cone-shaped or prism-shaped, the inner wall of the second free end is adapted to the shape of the first free end, and the size of the first free end in the first direction is larger than the size of the second free end in the first direction.

[0017] Optionally, one end of the second valve core close to the closed end of the housing is exposed from the first valve core and is provided with a protrusion, and along the radial direction of the second valve core, the protrusion is exposed from the circumferential surface of the second valve core; the valve structure comprises a second elastic member, the second elastic member is sleeved on the outer circumference of the second valve core, and one end of the second elastic member abuts against the protrusion, and the other end of the second elastic member abuts against the first valve core;

[0018] When the force exerted by the fluid in the first flow channel on the second valve core through the oil inlet hole is greater than the elastic force of the second elastic member, the second valve core moves in a direction away from the closed end of the shell, and a gap is formed between the first valve core and the second valve core, and the first flow channel is connected to the second flow channel through the gap.

[0019] Optionally, the valve structure comprises a valve sleeve fixedly sleeved on one end of the second valve core close to the closed end of the housing, the valve sleeve having a flange, and the flange being the protrusion.

[0020] Optionally, the valve structure includes a spring retaining ring, a mounting groove is formed on the circumferential surface of the second valve core, the spring retaining ring is arranged in the mounting groove, and the valve sleeve is fixedly connected to the second valve core through the spring retaining ring.

[0021] Optionally, a sealing structure is provided between the shell and the valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A cross-sectional view of a valve structure provided by an embodiment of the utility model in a natural state;

[0023] Figure 2 for Figure 1 A schematic diagram of the structure of the housing, the first valve core and the second valve core in the valve structure shown;

[0024] Figure 3 for Figure 1 The valve structure shown is a schematic structural diagram after omitting the first elastic member and the second elastic member when the valve structure functions as a back pressure valve;

[0025] Figure 4 for Figure 1 The valve structure shown is a schematic structural diagram of the valve structure when it functions as an oil replenishing valve after omitting the first elastic member and the second elastic member;

[0026] Figure 5a A schematic diagram of a valve structure 100 provided in an embodiment of the present application when applied to a hydraulic system;

[0027] Figure 5b for Figure 5a The schematic diagram of the hydraulic system shown is in another state.

[0028] Icon: 1-valve body; 11-first flow channel; 12-second flow channel; 2-housing; 201-first accommodating chamber; 3-first valve core; 3a-second free end; 31-oil inlet hole; 32-second accommodating chamber; 4-second valve core; 4a-first free end; 5-first elastic member; 6-second elastic member; 7-valve sleeve; 71-flange; 8-spring retaining ring; 9-sealing structure; 100-valve structure; 110-oil replenishing unit; 120-back pressure unit; 200-three-position four-way solenoid valve; 300-oil cylinder; 310-first cavity; 320-second cavity; 330-piston; 400-oil inlet pipeline; 500-oil tank. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] Figure 1 A cross-sectional view of a valve structure 100 provided in an embodiment of the present application in a natural state, Figure 2 for Figure 1 The schematic diagram of the structure of the housing 2, the first valve core 3 and the second valve core 4 in the valve structure 100 is shown. Figure 1 and Figure 2 As shown, a valve structure 100 provided in the present application includes a valve body 1, a shell 2, a first valve core 3 and a second valve core 4. The valve body 1 is formed with a first flow channel 11, a second flow channel 12 and an installation cavity, and the shell 2 is arranged in the installation cavity. The shell 2 has a first accommodating cavity 201 with one end open, and the open end A of the shell 2 faces the first flow channel 11 and the second flow channel 12. The end of the shell 2 opposite to the open end A is a closed end B, and the arrangement direction of the open end A and the closed end B is the first direction F. One end of the first valve core 3 is inserted into the open end A, and the first valve core 3 is slidably connected to the shell 2 along the first direction F. The first valve core 3 has a through hole extending along the first direction F, and the second valve core 4 is slidably connected to the through hole along the first direction F. The side wall of the first valve core 3 is provided with an oil inlet hole 31, and the oil inlet hole 31 is connected to the first flow channel 11.

[0031] The valve structure 100 is in a natural state (i.e. Figure 1When the force of the fluid in the second flow channel 12 acting on the first valve core 3 and the second valve core 4 is greater than the first preset value, the first valve core 3 and the second valve core 4 move toward the closed end B of the housing 2, and the first flow channel 11 is connected to the second flow channel 12 (as shown in the state). Figure 3 As shown, Figure 3 The dashed line with an arrow in the figure indicates the flow direction of the oil), so that the valve structure 100 can play the role of a back pressure valve in the hydraulic system. When the force of the fluid in the first flow channel 11 acting on the second valve core 4 through the oil inlet hole 31 is greater than the second preset value, the second valve core 4 moves in the direction away from the closed end B of the housing 2, and a gap is formed between the first valve core 3 and the second valve core 4. The first flow channel 11 and the second flow channel 12 are connected through the gap (such as Figure 4 As shown, Figure 4 The dashed line with an arrow in the figure indicates the flow direction of the oil), so that the valve structure 100 can play the role of an oil replenishing valve in the hydraulic system. It can be seen that the valve structure 100 in the present application integrates the functions of the back pressure valve and the oil replenishing valve through fewer components, which can not only save manufacturing costs, but also reduce the installation space required on the valve body 1, which is conducive to the miniaturization of the valve body 1.

[0032] In addition, in the present application, the valve body 1 is provided with an installation cavity for installing the valve structure 100; while in the related art, the back pressure valve and the oil replenishing valve are both separate structures, and the back pressure valve and the oil replenishing valve are installed separately, and the valve body 1 needs to be processed separately for installing the installation cavity for the back pressure valve and the oil replenishing valve. In comparison, the valve structure 100 provided in the present application can reduce the installation cavity, simplify the structure of the valve body 1, reduce the casting difficulty and casting cost of the valve body 1, and reduce the pressure loss caused by more oil circuits.

[0033] In some possible implementations, the valve structure 100 includes a first elastic member 5, which is disposed in the first accommodating chamber 201 and is located on the side of the first valve core 3 facing the closed end B of the housing 2. One end of the first elastic member 5 abuts against the closed end B of the housing 2, and the other end of the first elastic member 5 abuts against the first valve core 3. When the force of the fluid in the second flow channel 12 acting on the first valve core 3 and the second valve core 4 is greater than the elastic force of the first elastic member 5, the first valve core 3 and the second valve core 4 move toward the closed end B of the housing 2, and the first flow channel 11 is connected to the second flow channel 12 (such as Figure 3 As shown in FIG. 1 ), the valve structure 100 can play the role of a back pressure valve in a hydraulic system. The valve structure 100 can function as a back pressure valve through the first elastic member 5, which can make the action of the first valve core 3 more reliable and save costs. For example, the first elastic member 5 can be a spring.

[0034] Specifically, one end of the first valve core 3 facing the closed end B of the housing 2 can be sunken toward the open end A of the housing 2 to form a groove, and the first elastic member 5 abuts against the surface of the groove facing the closed end B of the housing 2, and the first elastic member 5 is partially located in the groove. In this way, the groove can play a certain circumferential limiting role on the first elastic member 5, preventing the first valve core 3 from being affected by the skewness of the first elastic member 5.

[0035] Please refer to Figure 2 , the end of the first valve core 3 away from the closed end B of the housing 2 may be formed with a second accommodating cavity 32, the end of the second accommodating cavity 32 away from the closed end B of the housing 2 is open, and the through hole and the oil inlet hole 31 are both connected to the second accommodating cavity 32. When the valve structure 100 is in a natural state, the second valve core 4 closes the open end of the second accommodating cavity 32. Exemplarily, the axis of the second accommodating cavity 32 coincides with the axis of the second valve core 4 and the axis of the through hole.

[0036] In one possible implementation, the side wall of the first valve core 3 is provided with at least two oil inlet holes 31, wherein at least one pair of oil inlet holes 31 are symmetrically arranged about the axis of the first valve core 3, so that the force exerted by the oil entering the second accommodating chamber 32 through the oil inlet holes 31 on the second valve core 4 can be more balanced and the movement of the second valve core 4 can be more stable.

[0037] Exemplarily, two oil inlet holes 31 are provided on the side wall of the first valve core 3 , the axes of the two oil inlet holes 31 are both along the radial direction of the first valve core 3 , and the two oil inlet holes 31 are symmetrically arranged about the axis of the first valve core 3 .

[0038] It is not difficult to understand that in other embodiments, the side wall of the first valve core 3 may also be provided with one, three, four or more oil inlet holes 31 .

[0039] The end of the second valve core 4 that is away from the closed end B of the housing 2 is the first free end 4a, and the size of the first free end 4a gradually increases along the direction from the closed end B of the housing 2 to the open end A of the housing 2. The end of the first valve core 3 that is away from the closed end B of the housing 2 is the second free end 3a. When the valve structure 100 is in a natural state, the first free end 4a is partially located on the side of the second free end 3a that faces the closed end B of the housing 2. In this way, when the oil enters the second accommodating chamber 32 from the oil inlet hole 31, the force area of ​​the first free end 4a of the second valve core 4 can be increased, so that the second valve core 4 can move more sensitively under the action of the oil, and the valve structure 100 can play the role of an oil replenishing valve in the hydraulic system.

[0040] Furthermore, in some embodiments, the first free end 4a is truncated or prism-shaped, the inner wall of the second free end 3a is matched with the outer shape of the first free end 4a, and the dimension of the first free end 4a in the first direction F is larger than the dimension of the second free end 3a in the first direction F. In this way, while ensuring the reliable action of the second valve core 4, the contact area between the second valve core 4 and the first valve core 3 is increased, ensuring the reliable sealing between the first valve core 3 and the second valve core 4 when the valve structure 100 is in the natural state and the state of the back pressure valve function.

[0041] In some embodiments, one end of the second valve core 4 close to the closed end B of the housing 2 is exposed to the first valve core 3, and one end of the second valve core 4 close to the closed end B of the housing 2 is provided with a protrusion. Along the radial direction of the second valve core 4, the protrusion is exposed on the circumference of the second valve core 4. The valve structure 100 includes a second elastic member 6, which is sleeved on the outer periphery of the second valve core 4, and one end of the second elastic member 6 abuts against the protrusion, and the other end of the second elastic member 6 abuts against the first valve core 3. When the force of the oil in the first flow channel 11 acting on the second valve core 4 through the oil inlet hole 31 is greater than the elastic force of the second elastic member 6, the second valve core 4 moves in the direction away from the closed end B of the housing 2, a gap is formed between the first valve core 3 and the second valve core 4, and the first flow channel 11 and the second flow channel 12 are connected through the gap. The valve structure 100 realizes the function of the oil replenishment valve through the second elastic member 6, which can make the action of the second valve core 4 more reliable and save costs. Exemplarily, the second elastic member 6 can be a spring.

[0042] Exemplarily, the valve structure 100 includes a valve sleeve 7 which is sleeved on one end of the second valve core 4 close to the closed end B of the housing 2 and is fixedly connected to the second valve core 4. Obviously, the valve sleeve 7 is located on the side of the closed end B of the first valve core 3 facing the housing 2. The valve sleeve 7 has a flange 71, which is the above-mentioned convex portion. Specifically, one end of the second valve core 4 close to the closed end B of the housing 2 can be formed with a chamfer to facilitate the installation of the valve sleeve 7 on the second valve core 4.

[0043] In a specific implementation, the valve structure 100 includes a spring retaining ring 8 , a mounting groove is formed on the circumferential surface of the second valve core 4 , the spring retaining ring 8 is disposed in the mounting groove, and the valve sleeve 7 is fixedly connected to the second valve core 4 via the spring retaining ring 8 .

[0044] In a possible implementation, a sealing structure 9 is provided between the housing 2 and the valve body 1 to ensure the sealing reliability of the flow channel in the valve structure 100. Exemplarily, the sealing structure 9 may be an O-ring. An annular groove is formed on the circumferential surface of the housing 2, and the O-ring is disposed in the annular groove and abuts against the mounting cavity of the valve body 1.

[0045] Figure 5aA schematic diagram of a valve structure 100 provided in an embodiment of the present application when applied to a hydraulic system, Figure 5b for Figure 5a The schematic diagram of the hydraulic system shown is in another state, wherein: Figure 5a and Figure 5b Only the part of the hydraulic system related to the valve structure 100 is shown. Figure 5a and Figure 5b The principle of a valve structure 100 provided in an embodiment of the present application when applied to the above hydraulic system is introduced. Figure 5a and Figure 5b As shown, the hydraulic system includes an oil inlet pipeline 400, an oil cylinder 300, a three-position four-way solenoid valve 200 and a valve structure 100 provided in the present application, wherein, for ease of understanding, the valve structure 100 is functionally divided into an oil replenishment unit 110 and a back pressure unit 120, but this does not mean that the valve structure 100 includes an oil replenishment valve and a back pressure valve that are structurally independent of each other.

[0046] Specifically, in one working condition, the oil enters the first cavity 310 of the oil cylinder 300 through the oil inlet pipeline 400 and the first passage of the three-position four-way solenoid valve 200 in sequence, and the piston 330 of the oil cylinder 300 moves to the second cavity 320 of the oil cylinder 300 under the action of the oil. Figure 5a The oil in the right chamber of the oil cylinder 300 in the perspective shown in the figure returns to the oil tank 500 through the second passage of the three-position four-way solenoid valve 200 and the back pressure unit 120 of the valve structure 100. During the process of the oil returning to the oil tank 500 through the back pressure unit 120 of the valve structure 100, the pressure in the second flow channel 12 of the valve body 1 continues to increase. When the pressure in the second flow channel 12 is greater than the elastic force of the first elastic member 5, the first valve core 3 and the second valve core 4 move toward the closed end B of the housing 2 (as shown in FIG. Figure 3 As shown), the oil returns to the oil tank 500 through the first flow channel 11.

[0047] Please continue to refer to Figure 5a , when the oil enters the first cavity 310 of the oil cylinder 300 through the oil inlet pipeline 400 and the first passage of the three-position four-way solenoid valve 200 in sequence, and the first cavity 310 of the oil cylinder 300 is emptied, the first cavity 310 is under negative pressure, and the oil in the oil tank 500 enters the first cavity 310 of the oil cylinder 300 through the oil replenishing unit 110 of the valve structure 100, thereby realizing the oil replenishing function. In the process of the oil in the oil tank 500 passing through the oil replenishing unit 110 of the valve structure 100 to the first cavity 310 of the oil cylinder 300, the force of the oil in the first flow channel 11 acting on the second valve core 4 through the oil inlet hole 31 on the first valve core 3 is greater than the elastic force of the second elastic member 6, and the second valve core 4 moves in the direction away from the closed end B of the housing 2, and the second flow channel 12 is connected to the first flow channel 11 through the gap between the first valve core 3 and the second valve core 4 (such as Figure 4 shown).

[0048] Next, please refer to Figure 5b In another working condition, the oil enters the second cavity 320 of the oil cylinder 300 through the oil inlet pipeline 400 and the third passage of the three-position four-way solenoid valve 200 in sequence, and the piston 330 of the oil cylinder 300 moves toward the first cavity 310. The oil in the first cavity 310 enters the oil tank 500 through the fourth passage of the three-position four-way solenoid valve 200 and the back pressure unit 120 of the valve structure 100 in sequence. In the process of the oil returning to the oil tank 500 through the back pressure unit 120 of the valve structure 100, the pressure in the second flow channel 12 of the valve body 1 continues to increase. When the pressure in the second flow channel 12 is greater than the elastic force of the first elastic member 5, the first valve core 3 and the second valve core 4 move toward the closed end B of the housing 2 (such as Figure 3 As shown), the oil returns to the oil tank 500 through the first flow channel 11.

[0049] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A valve structure, characterized in that: The valve body comprises a valve body, a shell, a first valve core and a second valve core, wherein the valve body is formed with a first flow channel, a second flow channel and a mounting cavity, and the shell is arranged in the mounting cavity; the shell has a first accommodating cavity with one end open, and the open end of the shell faces the first flow channel and the second flow channel; The end of the housing opposite to the open end is a closed end, and the arrangement direction of the open end and the closed end is a first direction; one end of the first valve core is inserted into the open end, and the first valve core is slidably connected to the housing along the first direction; the first valve core has a through hole extending along the first direction, and the second valve core is slidably connected to the through hole along the first direction; the side wall of the first valve core is provided with an oil inlet hole, and the oil inlet hole is communicated with the first flow channel; When the valve structure is in a natural state, the first valve core and the second valve core work together to block the communication between the first flow channel and the second flow channel; when the force of the fluid in the second flow channel acting on the first valve core and the second valve core is greater than a first preset value, the first valve core and the second valve core move toward the closed end of the shell, and the first flow channel is connected with the second flow channel; when the force of the fluid in the first flow channel acting on the second valve core through the oil inlet hole is greater than a second preset value, the second valve core moves away from the closed end of the shell, a gap is formed between the first valve core and the second valve core, and the first flow channel is connected with the second flow channel through the gap.

2. The valve structure according to claim 1, characterized in that: The first elastic member comprises a first elastic member, which is arranged in the first accommodating cavity and is located on the side of the first valve core facing the closed end of the housing; one end of the first elastic member abuts against the closed end of the housing, and the other end of the first elastic member abuts against the first valve core; When the force exerted by the fluid in the second flow channel on the first valve core and the second valve core is greater than the elastic force of the first elastic member, the first valve core and the second valve core move toward the closed end of the housing.

3. The valve structure according to claim 1, characterized in that: A second accommodating cavity is formed at one end of the first valve core away from the closed end of the housing, and one end of the second accommodating cavity away from the closed end of the housing is open; the through hole and the oil inlet hole are both connected to the second accommodating cavity; When the valve structure is in the natural state, the second valve core closes the open end of the second accommodating cavity.

4. The valve structure according to claim 3, characterized in that: The side wall of the first valve core is provided with at least two oil inlet holes, wherein at least one pair of the oil inlet holes is symmetrically arranged about the axis of the first valve core.

5. The valve structure according to claim 3 or 4, characterized in that: An end of the second valve core that is away from the closed end of the housing is a first free end, and a size of the first free end gradually increases along a direction from the closed end of the housing to the open end of the housing; The end of the first valve core facing away from the closed end of the housing is the second free end. When the valve structure is in the natural state, the first free end is partially located on the side of the second free end facing the closed end of the housing.

6. The valve structure according to claim 5, characterized in that: The first free end is in the shape of a truncated cone or a prism, the inner wall of the second free end is adapted to the outer shape of the first free end, and the dimension of the first free end in the first direction is larger than the dimension of the second free end in the first direction.

7. The valve structure according to any one of claims 1 to 4, characterized in that: One end of the second valve core close to the closed end of the housing is exposed from the first valve core and is provided with a protrusion, and along the radial direction of the second valve core, the protrusion is exposed from the circumferential surface of the second valve core; the valve structure comprises a second elastic member, the second elastic member is sleeved on the outer circumference of the second valve core, one end of the second elastic member is in contact with the protrusion, and the other end of the second elastic member is in contact with the first valve core; When the force exerted by the fluid in the first flow channel on the second valve core through the oil inlet hole is greater than the elastic force of the second elastic member, the second valve core moves in a direction away from the closed end of the shell, and a gap is formed between the first valve core and the second valve core, and the first flow channel is connected to the second flow channel through the gap.

8. The valve structure according to claim 7, characterized in that: The valve structure comprises a valve sleeve which is fixedly sleeved on one end of the second valve core close to the closed end of the housing, and the valve sleeve has a flange which is the convex portion.

9. The valve structure according to claim 8, characterized in that: It comprises a spring retaining ring, a peripheral surface of the second valve core is formed with an installation groove, the spring retaining ring is arranged in the installation groove, and the valve sleeve is fixedly connected to the second valve core through the spring retaining ring.

10. The valve structure according to any one of claims 1 to 4, characterized in that: A sealing structure is provided between the housing and the valve body.

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