A sealing structure of a valve body and a valve

Abstract

The present invention discloses a valve body sealing structure and valve, which realizes the switching and sealing of the exhaust channel in the valve body through this sealing method. A sealing portion is provided in the inner cavity of the valve body, located between the large valve core and the top surface of the inner cavity of the valve body; when it is necessary to close the large exhaust port, the large valve core moves to the closed position and cooperates with the sealing portion to close the large exhaust port, thereby forming a first connecting channel connecting to the small exhaust port; when it is necessary to further close the small exhaust port, the small valve core is raised to seal the first connecting channel to realize the closure of the small exhaust port. Only one sealing portion is required to realize the opening and closing of the two exhaust ports by the two valve cores respectively, which solves the problem that the sealing components of the existing combination valve need to be separately provided for the two valve cores.

Description

Technical Field

[0001] The present invention belongs to the technical field of valves, and in particular relates to a sealing structure of a valve body and a valve. Background Art

[0002] Fuel tanks currently on the market generally meet two requirements: 1. Refueling limits (overfilling prohibited); 2. Fuel tank venting capabilities under specific circumstances: timely pressure relief when positive pressure is present, and timely air replenishment when negative pressure is present. To meet these requirements, a fuel tank typically requires a refueling limiter and at least one rollover valve. New designs are emerging that combine the functions of both valves into a single device, reducing the number of valves required and making them easier to deploy. These are commonly referred to as combination valves, combining a refueling limiter and a rollover valve into a single device, providing both functions.

[0003] With the promulgation of the "National VI" regulations, the evaporative emission requirements for the entire fuel system have become increasingly stringent, and the requirements for dynamic leakage of fuel tanks (generally including horizontal shake test, angle rollover shake test and six-axis shake test, etc.) have also increased. This has put a certain test on the design of the valve, whether it is a refueling limit valve, a rollover valve or a combination valve, because these valves are all installed and fixed on the fuel tank, the valve core is connected to the inside of the fuel tank, and the valve nozzle is generally connected to the carbon canister through a pipeline. When the vehicle fluctuates during driving, the fuel in the fuel tank will also surge. If the valve core inside the valve cannot seal the exhaust channel in time, there is a certain probability that the fuel will flip out of the valve exhaust channel and flow out through the nozzle, forming a leakage phenomenon.

[0004] As for the existing combination valves on the market, one is: the combination valve is relatively large as a whole, with the valve core of the refueling limit valve on one side and the valve core of the rollover valve on the other side. The two do not interfere with each other, but because the two valve cores are separate, it is necessary to set sealing components that match the valve cores separately; the other is: the size of the combination valve is similar to that of an ordinary refueling limit valve, which is the valve core of the refueling limit valve and the valve core of the rollover valve stacked together, with a small float stacked on a large float. The small float correspondingly realizes the function of the refueling limit valve, and the large float correspondingly realizes the function of the rollover valve. The two superimposed forms also require two different sealing components to be set for sealing. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a sealing structure of a valve body and a valve, so as to solve the problem that the sealing components of the existing combination valve need to be separately provided for the two valve cores.

[0006] To solve the above problems, the technical solutions of the present invention are as follows:

[0007] A sealing structure of a valve body of the present invention is provided in the valve body, wherein a small discharge port and a large discharge port arranged around the small discharge port are provided on the top surface of the inner cavity of the valve body, wherein the small discharge port corresponds to a first exhaust channel, and the large discharge port corresponds to a second exhaust channel, a small valve core corresponds to the small discharge port, and a large valve core corresponds to the large discharge port, comprising:

[0008] a sealing portion, disposed in the inner cavity of the valve body and located between the large valve core and the top surface of the inner cavity of the valve body, for cooperating with the large valve core to seal the large exhaust port and close the second exhaust channel, thereby forming a first communication channel connecting the inner cavity of the valve body and the small exhaust port, wherein the bottom end of the first communication channel corresponds to the small valve core;

[0009] When the large discharge outlet needs to be closed, the large valve core slides to the closed position and cooperates with the sealing part to seal the large discharge outlet, and closes the second exhaust channel to form the first connecting channel; when the small discharge outlet needs to be closed, the small valve core slides to the closed position and cooperates with the bottom end of the first connecting channel to seal the small discharge outlet, and close the first exhaust channel.

[0010] The sealing structure of the valve body of the present invention, wherein the sealing portion includes a bearing member and a sealing assembly;

[0011] The bearing member is movably arranged in the inner cavity of the valve body or fixedly connected to the large valve core; and the bearing member is provided with a through hole matching the small discharge port;

[0012] The sealing assembly is arranged on the carrier and / or on the top surface of the inner cavity of the valve body, and is used to cooperate with the carrier to seal the large discharge port, and cooperate with the small discharge port and the through hole to form the first communication channel.

[0013] The sealing structure of the valve body of the present invention, wherein the sealing assembly includes a large sealing ring, a middle sealing ring and a small sealing ring;

[0014] The large sealing ring and the middle sealing ring are both arranged on the upper surface of the carrier and correspond to the large discharge port; the large sealing ring is sleeved on the large discharge port; the middle sealing ring is located between the large discharge port and the small discharge port;

[0015] The small sealing ring is arranged at the through hole to cooperate with and form the first communicating channel.

[0016] The sealing structure of the valve body of the present invention, wherein the sealing assembly includes a large sealing ring, a middle extension ring and a small sealing ring;

[0017] The large sealing ring is provided on the upper surface of the carrier, corresponding to the large discharge port, and sleeved on the large discharge port; the middle extension ring is provided on the top surface of the inner cavity of the valve body, corresponding to the large discharge port, and located between the large discharge port and the small discharge port;

[0018] The small sealing ring is arranged at the through hole to cooperate with and form the first communicating channel.

[0019] The sealing structure of the valve body of the present invention, wherein the sealing assembly includes a large extension ring, a middle sealing ring and a small sealing ring;

[0020] The large extension ring is provided on the top surface of the inner cavity of the valve body, corresponding to the large discharge port, and sleeved on the large discharge port; the middle sealing ring is provided on the upper surface of the carrier, corresponding to the large discharge port, and located between the large discharge port and the small discharge port;

[0021] The small sealing ring is arranged at the through hole to cooperate with and form the first communicating channel.

[0022] The sealing structure of the valve body of the present invention, wherein the sealing assembly includes a large extension ring, a middle extension ring and a small sealing ring;

[0023] The large extension ring is provided on the top surface of the inner cavity of the valve body, corresponding to the large discharge port, and sleeved on the large discharge port; the middle extension ring is provided on the top surface of the inner cavity of the valve body, corresponding to the large discharge port, and located between the large discharge port and the small discharge port;

[0024] The small sealing ring is arranged at the through hole to cooperate with and form the first communicating channel.

[0025] The sealing structure of the valve body of the present invention, wherein the sealing assembly includes a large extension ring and a small extension ring;

[0026] The large extension ring is provided on the top surface of the inner cavity of the valve body, corresponds to the large discharge port, and is sleeved on the large discharge port;

[0027] The small extension ring is provided on the top surface of the inner cavity of the valve body and corresponds to the large discharge port; the upper end of the small extension ring is located between the large discharge port and the small discharge port, and the diameter of the lower end is smaller than the diameter of the through hole;

[0028] The large extension ring, the outer side wall of the small extension ring, and the bearing member cooperate to seal the large discharge port; the small extension ring cooperates with the small discharge port to form the first communicating channel.

[0029] The sealing structure of the valve body of the present invention, the sealing assembly includes a large extension ring, a medium extension ring and a small extension ring;

[0030] The large extension ring is provided on the top surface of the inner cavity of the valve body, corresponding to the large discharge port, and sleeved on the large discharge port; the middle extension ring is provided on the top surface of the inner cavity of the valve body, corresponding to the large discharge port, and located between the large discharge port and the small discharge port;

[0031] The small extension ring is arranged on the top surface of the inner cavity of the valve body and is used to cooperate with the small discharge port to form the first communication channel.

[0032] In the sealing structure of the valve body of the present invention, when the sealing component is arranged on the carrier, the sealing component and the carrier are integrally formed; when the sealing component is arranged on the top surface of the inner cavity of the valve body, the sealing component and the valve body are integrally formed.

[0033] In the sealing structure of the valve body of the present invention, the bearing member includes a bearing unit and a sliding unit; the sliding unit is slidably connected to the inner cavity of the valve body; and the bearing unit is installed on the sliding unit.

[0034] In the sealing structure of the valve body of the present invention, the large exhaust port is a plurality of large exhaust holes arranged around the small exhaust port; the sealing portion includes a sealing assembly, and the sealing assembly includes a plurality of first sealing members and a second sealing member; the first sealing members are respectively arranged at the corresponding large exhaust holes, so as to form a second communication channel connecting the inner cavity of the valve body and the large exhaust holes;

[0035] The second sealing member is provided at the small discharge port to form the first communicating channel.

[0036] The sealing structure of the valve body of the present invention, wherein the sealing portion includes a sealing assembly, and the sealing assembly includes a large sealing ring, a middle sealing ring and a small sealing ring;

[0037] The large sealing ring and the middle sealing ring are both arranged on the top surface of the inner cavity of the valve body and correspond to the large discharge port; the large sealing ring is sleeved on the large discharge port; the middle sealing ring is located between the large discharge port and the small discharge port;

[0038] The small sealing ring is arranged on the top surface of the inner cavity of the valve body to form the first communicating channel.

[0039] The sealing structure of the valve body of the present invention, the sealing portion includes a bearing member and a sealing assembly; the bearing member is provided on the top surface of the large valve core; and the bearing member is provided with a through hole matching the small discharge port;

[0040] The sealing assembly includes a large sealing ring, a medium sealing ring and a small sealing ring; the large sealing ring and the medium sealing ring are both arranged on the upper surface of the carrier and correspond to the large discharge port; the large sealing ring is sleeved on the large discharge port; the medium sealing ring is located between the large discharge port and the small discharge port; the small sealing ring is arranged at the through hole to cooperate in forming the first connecting channel.

[0041] A valve of the present invention includes the sealing structure of the valve body described in any one of the above items.

[0042] Due to the adoption of the above technical solution, the present invention has the following advantages and positive effects compared with the prior art:

[0043] One embodiment of the present invention provides a sealing portion located between the large valve core and the top surface of the valve body inner cavity within the valve body; a large discharge port and a small discharge port are provided within the valve body, and a first exhaust channel corresponding to the small discharge port and a second exhaust channel corresponding to the large discharge port are provided. When the large discharge port needs to be closed, the large valve core moves to the closed position, cooperates with the sealing portion to close the large discharge port, closes the second exhaust channel and forms a first connecting channel connected to the small discharge port; when the small discharge port needs to be further closed, the small valve core is raised to seal the first connecting channel, and the first exhaust channel is closed to achieve closure of the small discharge port. Only one sealing portion is required to realize the opening and closing of the two discharge ports by the two valve cores respectively, which solves the problem that the sealing components of the existing combination valve need to be separately provided for the two valve cores. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 A schematic diagram of an embodiment of the sealing structure of the present invention;

[0045] Figure 2 is a schematic diagram of another embodiment of the sealing structure of the present invention;

[0046] Figure 3 is a schematic diagram of another embodiment of the sealing structure of the present invention;

[0047] Figure 4 is a schematic diagram of a second exhaust channel of the sealing structure of the present invention;

[0048] Figure 5 is a schematic diagram of a first exhaust channel of the sealing structure of the present invention;

[0049] Figure 6 This is a schematic diagram of the sealing portion of the sealing structure of the present invention being arranged on the large valve core;

[0050] Figure 7 This is a schematic diagram of the fully closed sealing structure of the present invention.

[0051] Explanation of the reference numerals: 1: valve body; 2: large discharge port; 3: small discharge port; 4: carrier; 401: sealing unit; 402: sliding unit; 5: large valve core; 6: small valve core; 7: large sealing ring; 8: medium sealing ring; 9: small sealing ring; 10: medium extension ring; 11: small extension ring. DETAILED DESCRIPTION

[0052] The following is a detailed description of a sealing structure and a valve according to the present invention in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description and claims.

[0053] The combination valve referred to in this embodiment is a combination valve that can simultaneously realize the functions of a refueling limit valve and a rollover valve, and is applied and installed in a fuel tank.

[0054] A sealing structure of the present embodiment is arranged in a valve body 1 of a combination valve with a dual valve core, and is used to seal a small discharge port 3 on the top surface of the inner cavity of the valve body 1 and a large discharge port 2 arranged in an annular manner around the small discharge port 3. The valve body is provided with a first exhaust channel corresponding to the small discharge port 3 and a second exhaust channel corresponding to the large discharge port 2. The dual valve cores are a small valve core 6 corresponding to the small discharge port 3 and a large valve core 5 corresponding to the large discharge port 2.

[0055] See Figures 1 to 5 The sealing structure specifically includes a sealing portion.

[0056] The sealing portion is arranged in the inner cavity of the valve body 1 and is located between the large valve core 5 and the top surface of the inner cavity of the valve body 1. It is used to cooperate with the large valve core 5 to seal the large discharge port 2 and form a first communicating channel connecting the inner cavity of the valve body 1 and the small discharge port 3, and the bottom end of the first communicating channel corresponds to the small valve core 6.

[0057] In actual operation, the combination valve needs to realize two situations according to different scenarios. The first situation is to close the large outlet 2 but open the small outlet 3, and the second situation is to close both the large outlet 2 and the small outlet 3.

[0058] In the first case, the large valve core 5 moves upward to the top of the inner cavity of the valve body 1 and cooperates with the sealing portion to seal the large exhaust port 2, closing the second exhaust channel and forming the first communication channel. In the second case, the small valve core 6 moves upward to the top of the inner cavity of the valve body 1, and the top surface of the small valve core 6 cooperates with the bottom end of the first communication channel to seal the bottom end opening of the first communication channel, closing the second exhaust channel, and thus closing the small exhaust port 3.

[0059] See Figure 4 、 Figure 5 、 Figure 7This embodiment provides a sealing portion within the valve body cavity, located between the large valve core 5 and the top surface of the valve body 1. When the large outlet port 2 needs to be closed, the large valve core 5 moves to the closed position and cooperates with the sealing portion to close the large outlet port 2, forming a first communication channel with the small outlet port 3. When the small outlet port 3 needs to be further closed, the small valve core 6 rises to seal the first communication channel, thereby closing the small outlet port 3. With only one sealing portion, both valve cores can open and close the two outlets, respectively, eliminating the problem of existing combination valves requiring separate sealing components for each valve core.

[0060] The specific structure of this embodiment is further described below:

[0061] In this embodiment, one implementation method includes a sealing portion comprising a carrier 4 and a sealing assembly. The carrier 4 is movably disposed within the inner cavity of the valve body 1 or fixedly connected to the large valve core 5. The carrier 4 is provided with a through hole that matches the small discharge port 3. The sealing assembly is disposed on the carrier 4 and / or on the top surface of the inner cavity of the valve body 1, and is used to cooperate with the carrier 4 to seal the large discharge port 2 and to form a first communication channel with the small discharge port 3 and the through hole.

[0062] Furthermore, when the sealing assembly is provided on the carrier 4, the sealing assembly and the carrier 4 are integrally formed. When the sealing assembly is provided on the top surface of the inner cavity of the valve body 1, the sealing assembly and the valve body 1 are integrally formed.

[0063] Furthermore, when the sealing assembly is partially provided on the carrier 4 and partially provided on the valve body 1 , it can be integrally formed with the carrier 4 and the valve body 1 respectively.

[0064] Specifically, the carrier 4 may include a sealing unit 401 and a sliding unit 402. The sliding unit 402 is slidably connected to the inner cavity of the valve body 1 via a sliding rail and a sliding groove. The sealing unit 401 is mounted on the sliding unit 402 and is used to cooperate with the sealing assembly to open and close the two outlets.

[0065] In this embodiment, the sealing part can also be a sealing assembly, which specifically includes a plurality of first sealing members and a second sealing member; the first sealing members are respectively arranged on the corresponding large exhaust holes 2 to form a second connecting channel connecting the inner cavity of the valve body 1 and the large exhaust holes 2; the second sealing member is arranged on the corresponding small exhaust port 3 to form a first connecting channel.

[0066] When the large discharge port needs to be closed, the large valve core 2 moves up to the top of the inner cavity of the valve body 1, and the top surface of the large valve core 5 cooperates with the bottom end of the second communication channel to seal the bottom end opening of the second communication channel, thereby closing the large discharge port 2. When the small discharge port needs to be closed, the small valve core 6 moves up to the top of the inner cavity of the valve body 1, and the top surface of the small valve core 6 cooperates with the bottom end of the first communication channel to seal the bottom end opening of the first communication channel, thereby closing the small discharge port 3.

[0067] In this embodiment, the sealing portion can also be another sealing assembly, which includes a large sealing ring 7, a medium sealing ring 8, and a small sealing ring 9. The large sealing ring 7, the medium sealing ring 8, and the small sealing ring 9 are all located on the top surface of the inner cavity of the valve body 1 and correspond to the large discharge port 2. The large sealing ring 7 is sleeved on the large discharge port 2, the medium sealing ring 8 is located between the large discharge port 2 and the small discharge port 3, and the small sealing ring 9 is also located between the large discharge port 2 and the small discharge port 3 to form a first communication channel.

[0068] When the large discharge port 2 needs to be closed, the large valve core 2 moves up to the top of the inner cavity of the valve body 1, and the top surface of the large valve core 5 cooperates with the bottom ends of the large sealing ring 7 and the middle sealing ring 8 to close the large discharge port 2. When the small discharge port 3 needs to be closed, the small valve core 6 moves up to the top of the inner cavity of the valve body 1, and the top surface of the small valve core 6 cooperates with the bottom end of the first communication channel to seal the bottom end opening of the first communication channel, thereby closing the small discharge port 3.

[0069] See Figure 7 In this embodiment, the sealing portion can also be a carrier and sealing assembly directly provided on the large valve core. The carrier is provided on the top surface of the large valve core and is provided with a through hole that matches the small discharge port. The sealing assembly can include a large sealing ring 7, a medium sealing ring 8, and a small sealing ring 9. The large sealing ring 7 and the medium sealing ring 8 are both provided on the upper surface of the carrier and correspond to the large discharge port 2; the large sealing ring 7 is sleeved on the large discharge port 2; the medium sealing ring 8 is located between the large discharge port 2 and the small discharge port 3; and the small sealing ring 9 is provided at the through hole to cooperate in forming a first connecting channel.

[0070] When the large discharge port 2 needs to be closed, the large valve core 2 moves up to the top of the inner cavity of the valve body 1, and the upper ends of the large sealing ring 7 and the middle sealing ring 8 cooperate with the top surface of the inner cavity of the valve body to close the large discharge port 2. When the small discharge port 3 needs to be closed, the small valve core 6 moves up to the top of the inner cavity of the valve body 1, and the top surface of the small valve core 6 cooperates with the bottom end of the first communication channel to seal the bottom end opening of the first communication channel, thereby closing the small discharge port 3.

[0071] Of course, in other embodiments, the sealing assembly may be directly mounted on the large valve core without using a bearing member, and this is not specifically limited here.

[0072] Example 2

[0073] This embodiment specifically describes multiple implementations of the sealing assembly in the above embodiment 1.

[0074] Implementation method 1: See Figure 1 The sealing assembly specifically includes a large sealing ring 7, a medium sealing ring 8 and a small sealing ring 9.

[0075] A large sealing ring 7 and a middle sealing ring 8 are provided on the upper end surface of the carrier 4 .

[0076] The diameter of the large sealing ring 7 must be larger than the maximum diameter of the large outlet 2, while the diameter of the medium sealing ring 8 must be smaller than the minimum diameter of the large outlet 2 and the maximum diameter of the small outlet 3. This arrangement ensures that when the carrier 4 is in the closed position, it can closely contact the top surface of the inner cavity of the valve body 1 and the walls inside and outside the large outlet 2, thereby sealing the large outlet 2.

[0077] After the large outlet 2 is sealed, the small outlet 3 communicates with the inner cavity of the valve body 1 through the through-hole of the carrier 4. To seal the small outlet 3, a small sealing ring 9 is installed on the lower end face of the sealing ring. The diameter of this small sealing ring 9 must be larger than the diameter of the through-hole. When the small valve core 6 rises, the small sealing ring 9 contacts the top surface of the small valve core 6 and seals the small outlet 3.

[0078] Implementation method 2: See Figure 2 This embodiment is a modification of the above-mentioned embodiment 1. The arrangement of the large sealing ring 7 and the small sealing ring 9 remains unchanged, and the middle sealing ring 8 is removed. Specifically, a middle extension ring 10 is provided on the wall surface between the large discharge port 2 and the small discharge port 3 on the top surface of the inner cavity of the valve body 1. The lower end of the middle extension ring 10 is used to contact the upper end surface of the carrier 4. When the carrier 4 moves to the closed position, it cooperates with the large sealing ring 7 to achieve sealing of the large discharge port 2, and at the same time, it can cooperate with the through hole of the carrier 4 to achieve communication between the small discharge port 3 and the inner cavity of the valve body 1. The sealing method of the small sealing ring 9 is the same as that of the embodiment 1 and will not be repeated here.

[0079] Implementation 3: This implementation is also a modification of Implementation 1. The arrangement of the middle sealing ring 8 and small sealing ring 9 remains unchanged, while the large sealing ring 7 has been removed. Specifically, a large extension ring is positioned on the top surface of the inner cavity of the valve body 1, outside the large discharge port 2. The lower end of this large extension ring is designed to contact the upper end surface of the support member 4. When the support member 4 moves to the closed position, it cooperates with the middle sealing ring 8 to seal the large discharge port 2. The sealing method of the middle sealing ring 8 and small sealing ring 9 for the small discharge port 3 is the same as in Implementation 1 and will not be further described.

[0080] Implementation method four: This implementation method is also a modification of the above-mentioned implementation method one. The setting method of the small sealing ring 9 remains unchanged, and the large sealing ring 7 and the medium sealing ring 8 are removed. Specifically, a large extension ring is provided on the wall surface of the top surface of the inner cavity of the valve body 1, which is located outside the large discharge port 2. The lower end of the large extension ring is used to contact the upper end surface of the carrier 4. A medium extension ring 10 is provided on the wall surface of the top surface of the inner cavity of the valve body 1, which is located between the large discharge port 2 and the small discharge port 3. The lower end of the medium extension ring 10 is also used to contact the upper end surface of the carrier 4. When the carrier 4 moves to the closed position, the large extension ring and the medium extension ring 10 cooperate with the carrier 4 to achieve sealing of the large discharge port 2. The sealing method of the small sealing ring 9 to the small discharge port 3 is the same as that in implementation method one and will not be repeated.

[0081] Implementation 5: See Figure 3 This embodiment is a modification of the aforementioned embodiment 1. The large sealing ring 7, medium sealing ring 8, and small sealing ring 9 are all removed. Specifically, a large extension ring is provided on the wall surface of the inner cavity of the valve body 1, located outside the large discharge port 2. The lower end of the large extension ring is configured to contact the upper end surface of the carrier 4. A small extension ring 11 is provided on the wall surface of the inner cavity of the valve body 1, located between the large discharge port 2 and the small discharge port 3. The upper end diameter of the small extension ring 11 is larger than the inner ring diameter of the carrier 4, while the lower end diameter is smaller than the inner ring diameter of the carrier 4. In other words, the outer wall of the small extension ring 11 is configured to contact the wall of the through hole of the carrier 4. When the carrier 4 moves to the closed position, the carrier 4, the outer wall of the small extension ring 11, and the large extension ring cooperate to seal the large discharge port 2. The lower end of the small extension ring 11 cooperates with the upper surface of the small float to seal the small discharge port 3.

[0082] Of course, in other embodiments, the sealing assembly may be provided on the first float and the second float, directly cooperating with the large discharge port 2 and the small discharge port 3 for sealing; or it may be directly provided on each large discharge port 2 and the small discharge port 3, and a sealing ring may be extended downward to cooperate with the top surface of the valve core for sealing. There are many specific implementation methods, which are not specifically limited here.

[0083] In this embodiment, an annular sealing ring or extension ring cooperates with the carrier 4 and the top surface of the valve body 1 to seal the large outlet 2, and cooperates with the small valve core 6 to seal the small outlet 3. The annular component facilitates the closing and opening of both outlets. For example, to close or open the large outlet 2, simply contact the upper surface of the annular component with the top surface of the valve body 1. Compared to sealing methods using sealing blocks or other sealing components to seal the outlets, the contact area is smaller, resulting in less force required to close and open the valve, allowing for more flexible opening and closing of the valve.

[0084] Example 3

[0085] A combination valve includes the sealing structure of embodiment 1 or embodiment 2. A sliding carrier 4 is provided in the valve body 1, and a sealing assembly is provided on the carrier 4 and / or the valve core. When the large discharge port 2 needs to be closed, the sealing assembly cooperates with the carrier 4 to seal the large discharge port 2, and at the same time, a first communication channel connecting the inner cavity of the valve body 1 to the small discharge port 3 can be left through the through hole on the carrier 4; when the small discharge port 3 needs to be further closed, the small discharge port 3 can be closed by raising the small valve core 6 to seal the first communication channel. Only one carrier 4 is required to realize the opening and closing of the two discharge ports by the two valve cores, which solves the problem that the sealing components of the existing combination valve need to be separately provided for the two valve cores.

[0086] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they still fall within the scope of protection of the present invention.

Claims

1. A sealing structure of a valve body, characterized in that: A valve body is provided, wherein a small discharge port and a large discharge port arranged around the small discharge port are provided on the top surface of the inner cavity of the valve body, the small discharge port corresponds to a first exhaust channel, the large discharge port corresponds to a second exhaust channel, a small valve core corresponds to the small discharge port, and a large valve core corresponds to the large discharge port, comprising: a sealing portion, disposed in the inner cavity of the valve body and located between the large valve core and the top surface of the inner cavity of the valve body, for cooperating with the large valve core to seal the large exhaust port and close the second exhaust channel, thereby forming a first communication channel connecting the inner cavity of the valve body and the small exhaust port, wherein the bottom end of the first communication channel corresponds to the small valve core; When the large discharge port needs to be closed, the large valve core slides to the closed position under the action of the buoyancy of the oil and cooperates with the sealing portion to seal the large discharge port, and closes the second exhaust channel to form the first communication channel; when the small discharge port needs to be closed, the small valve core slides to the closed position under the action of the buoyancy of the oil and cooperates with the bottom end of the first communication channel to seal the small discharge port, and closes the first exhaust channel; The sealing portion includes a bearing member and a sealing assembly; The bearing member is movably arranged in the inner cavity of the valve body or fixedly connected to the large valve core; and the bearing member is provided with a through hole matching the small discharge port; The sealing assembly is provided on the carrier and / or on the top surface of the inner cavity of the valve body, and is used to cooperate with the carrier to seal the large discharge port, and cooperate with the small discharge port and the through hole to form the first communication channel; The bearing member includes a bearing unit and a sliding unit; the sliding unit is slidably connected to the inner cavity of the valve body; and the bearing unit is installed on the sliding unit.

2. The sealing structure of the valve body according to claim 1, characterized in that: The sealing assembly includes a large sealing ring, a middle sealing ring and a small sealing ring; The large sealing ring and the middle sealing ring are both arranged on the upper surface of the carrier and correspond to the large discharge port; the large sealing ring is sleeved on the large discharge port; the middle sealing ring is located between the large discharge port and the small discharge port; The small sealing ring is arranged at the through hole to cooperate with and form the first communicating channel.

3. The sealing structure of the valve body according to claim 1, wherein: The sealing assembly includes a large sealing ring, a middle extension ring and a small sealing ring; The large sealing ring is provided on the upper surface of the carrier, corresponding to the large discharge port, and sleeved on the large discharge port; the middle extension ring is provided on the top surface of the inner cavity of the valve body, corresponding to the large discharge port, and located between the large discharge port and the small discharge port; The small sealing ring is arranged at the through hole to cooperate with and form the first communicating channel.

4. The sealing structure of the valve body according to claim 1, wherein: The sealing assembly includes a large extension ring, a middle sealing ring and a small sealing ring; The large extension ring is provided on the top surface of the inner cavity of the valve body, corresponding to the large discharge port, and sleeved on the large discharge port; the middle sealing ring is provided on the upper surface of the carrier, corresponding to the large discharge port, and located between the large discharge port and the small discharge port; The small sealing ring is arranged at the through hole to cooperate with and form the first communicating channel.

5. The sealing structure of the valve body according to claim 1, wherein: The sealing assembly includes a large extension ring, a medium extension ring and a small sealing ring; The large extension ring is provided on the top surface of the inner cavity of the valve body, corresponding to the large discharge port, and sleeved on the large discharge port; the middle extension ring is provided on the top surface of the inner cavity of the valve body, corresponding to the large discharge port, and located between the large discharge port and the small discharge port; The small sealing ring is arranged at the through hole to cooperate with and form the first communicating channel.

6. The sealing structure of the valve body according to claim 1, wherein: The sealing assembly includes a large extension ring and a small extension ring; The large extension ring is provided on the top surface of the inner cavity of the valve body, corresponds to the large discharge port, and is sleeved on the large discharge port; The small extension ring is provided on the top surface of the inner cavity of the valve body and corresponds to the large discharge port; the upper end of the small extension ring is located between the large discharge port and the small discharge port, and the diameter of the lower end is smaller than the diameter of the through hole; The large extension ring, the outer side wall of the small extension ring, and the bearing member cooperate to seal the large discharge port; the small extension ring cooperates with the small discharge port to form the first communicating channel.

7. The sealing structure of the valve body according to claim 1, wherein: The sealing assembly includes a large extension ring, a medium extension ring and a small extension ring; The large extension ring is provided on the top surface of the inner cavity of the valve body, corresponding to the large discharge port, and sleeved on the large discharge port; the middle extension ring is provided on the top surface of the inner cavity of the valve body, corresponding to the large discharge port, and located between the large discharge port and the small discharge port; The small extension ring is arranged on the top surface of the inner cavity of the valve body and is used to cooperate with the small discharge port to form the first communication channel.

8. The sealing structure of the valve body according to claim 1, wherein: When the sealing assembly is arranged on the carrier, the sealing assembly and the carrier are integrally formed; when the sealing assembly is arranged on the top surface of the inner cavity of the valve body, the sealing assembly and the valve body are integrally formed.

9. The sealing structure of the valve body according to claim 1, wherein: The large exhaust port is a plurality of large exhaust holes arranged around the small exhaust port; the sealing portion includes a sealing assembly, and the sealing assembly includes a plurality of first sealing members and a second sealing member; the first sealing members are respectively arranged at the corresponding large exhaust holes, so as to form a second communication channel connecting the inner cavity of the valve body and the large exhaust holes; The second sealing member is provided at the small discharge port to form the first communicating channel.

10. The sealing structure of the valve body according to claim 1, wherein: The sealing portion includes a sealing assembly, and the sealing assembly includes a large sealing ring, a middle sealing ring and a small sealing ring; The large sealing ring and the middle sealing ring are both arranged on the top surface of the inner cavity of the valve body and correspond to the large discharge port; the large sealing ring is sleeved on the large discharge port; the middle sealing ring is located between the large discharge port and the small discharge port; The small sealing ring is arranged on the top surface of the inner cavity of the valve body to form the first communicating channel.

11. The sealing structure of the valve body according to claim 1, wherein: The sealing portion includes a bearing member and a sealing assembly; the bearing member is arranged on the top surface of the large valve core; and the bearing member is provided with a through hole matching the small discharge port; The sealing assembly includes a large sealing ring, a medium sealing ring and a small sealing ring; the large sealing ring and the medium sealing ring are both arranged on the upper surface of the carrier and correspond to the large discharge port; the large sealing ring is sleeved on the large discharge port; the medium sealing ring is located between the large discharge port and the small discharge port; the small sealing ring is arranged at the through hole to cooperate in forming the first connecting channel.

12. A valve, characterized in that: The invention comprises a sealing structure of a valve body according to any one of claims 1 to 11.

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