Valve device and sealing structure

Abstract

The invention provides a valve device and a sealing structure, the valve device comprises a valve body, a valve core and a base, the valve body is provided with a valve cavity, at least part of the valve core is inserted into the valve cavity, the valve core comprises a first component, and the valve body comprises a second component; the first part is provided with a first end face, the second part is provided with a second end face, the first end face and the second end face are adjacently arranged, the base is provided with a first face part and a second face part, the first face part and the second face part are adjacently arranged, the first face part and the first end face are opposite, and the second face part and the second end face are opposite; the sealing gasket comprises a first gasket part, a second gasket part and a third gasket part, and the third gasket part is connected with the first gasket part and the second gasket part; the first gasket part is located between the first face part and the first end face, the second gasket part is located between the second face part and the second end face, the first gasket part abuts against the first face part or the first end face, and the second gasket part abuts against the second end face or the second face part. The scheme can improve the sealing effect.

Description

Technical Field

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

[0002] There are situations in the valve body where gaps need to be sealed by seals. Sealing rings are commonly used sealing components. However, in actual use, the sealing of the sealing rings is affected by the structure of the components to be sealed, and there is still a problem of unreliable sealing. Summary of the invention

[0003] The purpose of the present application is to provide a valve device and a sealing structure, which can improve the sealing performance and enhance the sealing effect.

[0004] The present application provides a valve device, including a valve body, a valve core and a base, wherein the valve body has a valve cavity, at least a portion of the valve core is inserted into the valve cavity, the valve core includes a first component, and the valve body includes a second component; the first component has a first end surface, the second component has a second end surface, the first end surface and the second end surface are arranged adjacent to each other, the base has a first face surface and a second face surface, the first face surface and the first end surface are opposite to each other, and the second face surface and the second end surface are opposite to each other;

[0005] The valve device also includes a sealing gasket, which includes a first gasket portion, a second gasket portion and a third gasket portion, wherein the third gasket portion connects the first gasket portion and the second gasket portion; the first gasket portion abuts against the first face portion, and the second gasket portion abuts against the second end face, or the first gasket portion abuts against the first end face, and the second gasket portion abuts against the second face portion.

[0006] The present application also provides a sealing structure, comprising a first component, a second component and a base, wherein the first component has a first end surface, the second component has a second end surface, and the base has a first face portion and a second face portion, the first face portion and the second face portion are adjacently arranged, the first end surface and the second end surface are adjacently arranged, the first face portion and the first end surface are opposite to each other, and the second face portion and the second end surface are opposite to each other;

[0007] The sealing structure also includes a sealing gasket, which includes a first gasket portion, a second gasket portion and a third gasket portion, wherein the third gasket portion connects the first gasket portion and the second gasket portion; the first gasket portion abuts against the first face portion, and the second gasket portion abuts against the second end face, or the first gasket portion abuts against the first end face, and the second gasket portion abuts against the second face portion.

[0008] The valve device in the present application is provided with a sealing gasket, which seals the second end face of the second component and the first end face of the first component, that is, it can seal the gap between the first component and the second component. When the first end face and the second end face are not flush but have a certain height deviation, the usual sealing gasket or sealing coil is affected by the height deviation, which is difficult to compact and affects the sealing effect. In the present application, as long as the sealing gasket can be squeezed axially between the base and the first component and the base and the second component, it is equivalent to moving part of the sealing position to the base, which can still meet the sealing requirements, but does not require the sealing gasket to be compacted on the first component and the second component at the same time. It can be seen that the sealing performance of the sealing gasket in the present application is not affected by the height deviation, thereby reducing the assembly requirements for the first component and the second component. When the first end face and the second end face are not flush due to assembly errors, the sealing effect is still guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a schematic diagram of the structure of the ejector in the embodiment of the present application;

[0010] Figure 2 for Figure 1 A top view schematic diagram of

[0011] Figure 3 for Figure 2 AA section view;

[0012] Figure 4 for Figure 1 Schematic diagram after disassembling the control head;

[0013] Figure 5 for Figure 4 Explosion diagram of

[0014] Figure 6 for Figure 4 A schematic diagram of the main view;

[0015] Figure 7 for Figure 6 BB-direction cross-sectional schematic diagram;

[0016] Figure 8 for Figure 7 A magnified schematic diagram of the middle C area;

[0017] Fig. 9 for Figure 8 Schematic diagram of the structure of the sealing gasket;

[0018] Fig.10 for Fig. 9 A schematic diagram of the main view of the middle sealing gasket;

[0019] Fig.11 for Fig.10 DD section diagram;

[0020] Fig.12 for Figure 8 An enlarged schematic diagram of the location of the sealing gasket;

[0021] Fig.13 for Figure 5 Schematic diagram of the assembly of the middle injection nozzle 301 and the sealing gasket;

[0022] Fig.14 It is a partial schematic diagram of a base of a split structure in an embodiment of the present application being arranged in a valve device;

[0023] Fig.15 This is a schematic structural diagram of a sealing gasket in another embodiment of the present application;

[0024] Fig.16 A partial schematic diagram of a sealing gasket of another structure disposed in a valve device;

[0025] Fig.17 for Figure 5 Schematic diagram of the middle base;

[0026] Fig.18 for Figure 5 Schematic diagram of the locking nut.

[0027] Figure 1-18 The reference numerals in the drawings are described as follows:

[0028] 1- Control head;

[0029] 2-valve body; 21-second end surface; 22-first step surface; 2a-second component; 201-valve chamber;

[0030] 3-valve core; 31-first end surface; 32-step surface; 3a-first component; 301-injection nozzle 301;

[0031] 4-locking nut;

[0032] 5-base; 51-base; 511-third component; 512-fourth component; 52-cylindrical portion; 51a-third end surface; 51a1-first face portion; 51a2-second face portion;

[0033] 6-sealing gasket; 61-first gasket portion; 611-first rib; 62-second gasket portion; 621-second rib; 63-third gasket portion;

[0034] 7-valve needle component;

[0035] 8-Rotor components. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0037] This embodiment provides a sealing structure, including a first component 3a, a second component 2a and a base 5, which can be referred to Figure 8 It is understood that the first component 3a has a first end face 31, the second component 2a has a second end face 21, and the base 5 has a third end face 51a. The first end face 31 and the second end face 21 are arranged adjacent to each other and both face the third end face 51a. The third end face 51a includes a first face portion 51a1 and a second face portion 51a2, wherein the first face portion 51a1 is opposite to the first end face 31, and the second face portion 51a2 is opposite to the second end face 21, and the base 5 and the first component 3a and the second component 2a are relatively fixed.

[0038] Specifically in this embodiment, a valve device is provided, the valve device includes the above-mentioned sealing structure, the valve device is an injector, for example, a CO 2 Injector. Figures 1 to 8 understand, Figure 1 This is a schematic diagram of the structure of the ejector in the embodiment of the present application; Figure 2 for Figure 1 Schematic diagram of top view; Figure 3 for Figure 2 AA section diagram; Figure 4 for Figure 1 Schematic diagram after the control head 1 is disassembled; Figure 5 for Figure 4 Exploded diagram of Figure 6 for Figure 4 The main schematic diagram of Figure 7 for Figure 6 BB section diagram; Figure 8 for Figure 7 Magnified view of area C in the middle.

[0039] The valve device in this embodiment includes a valve body 2, a valve needle component 7, a control head 1, and a rotor component 8. The control head 1 includes a coil component, which can control the rotation of the rotor component 8. The rotor component 8 drives the valve needle component 7 to rotate, and the threaded fit enables the needle component 7 to move axially, thereby adjusting the valve opening. The valve device is specifically an injector. The valve core 3 of the valve device includes an injection nozzle 301. Figure 1As a perspective, the axial direction and the up and down directions of the valve device are defined, the control head 1 is located at the upper end, the valve body 2 is located at the lower end of the control head 1, the valve body 2 has a valve cavity 201, the injection nozzle 301 is inserted in the valve cavity 201, part of the valve needle component 7 is located in the injection nozzle 301, and cooperates with the injection nozzle 301, and the valve port is located at the injection nozzle 301. At this time, the injection nozzle 301 includes the above-mentioned first component 3a, which may be a part of the injection nozzle 301, or the injection nozzle 301 is specifically the first component 3a, the valve body 2 includes the above-mentioned second component 2a, which may be a part of the valve body 2, or the valve body 2 is specifically the second component 2a, the first end face 31, the second end face 21 and the third end face 51a of the base 5 are all arranged in the axial direction, and are correspondingly annular, the second end face 21 of the valve body 2 and the first end face 31 of the injection nozzle 301 are adjacently distributed in the radial direction, which is a direction perpendicular to the axial direction, and the first end face 31 of the first component 3a is located on the inner side of the second end face 21 of the second component 2a, that is, the first end face 31 is arranged closer to the axis of the valve body 2. The valve body 2 and the injection nozzle 301 are adjacent, and there may be a gap between them in the radial direction, then the medium in the valve cavity 201 (the medium is, for example, CO 2 ) may flow into the gap and leak out from the gap between the first end surface 31 and the second end surface 21.

[0040] To this end, the valve device in this embodiment also includes a sealing gasket 6, please refer to Figures 9 to 11 understand, Fig. 9 for Figure 8 A schematic structural diagram of the middle sealing gasket 6; Fig.10 for Fig. 9 The main schematic diagram of the middle sealing gasket 6; Fig.11 for Fig.10 DD section diagram; Fig.12 for Figure 8 An enlarged view of the position of the middle sealing gasket 6; Fig.13 for Figure 5 Schematic diagram of the assembly of the injection nozzle 301 and the sealing gasket 6.

[0041] The sealing gasket 6 includes a first gasket portion 61, a second gasket portion 62 and a third gasket portion 63. The third gasket portion 63 connects the first gasket portion 61 and the second gasket portion 62. In order to adapt to the above three end faces, the sealing gasket 6 is also an annular structure. Figure 9-11 From the perspective of FIG. 1 , the first gasket portion 61 , the third gasket portion 63 , and the second gasket portion 62 of the sealing gasket 6 are sequentially distributed from the inside to the outside in the radial direction. Figure 8As shown, the downward end face of the base 5 is the third end face 51a. For ease of understanding, the third end face 51a can be defined radially into two parts, namely an annular first face part 51a1 and an annular second face part 51a2. The first face part 51a1 and the first end face 31 are opposite to each other in the axial direction, and the second face part 51a2 and the second end face 21 are opposite to each other in the axial direction, that is, in the axial projection, the first face part 51a1 and the first end face 31 at least partially overlap, and the second face part 51a2 and the second end face 21 at least partially overlap.

[0042] In the assembled state, that is, the injection nozzle 301, the base 5, the valve body 2 and the sealing gasket 6 are in the assembled state, the first gasket portion 61 of the sealing gasket 6 abuts against the first surface 51a1 of the base 5, and the second gasket portion 62 abuts against the second end surface 21, as shown in FIG. Figure 8 In this way, the first gasket portion 61 of the sealing gasket 6 and the first surface portion 51a1 of the base 5 cooperate to form a sealing position, the second gasket portion 62 of the sealing gasket 6 and the second end surface 21 of the valve body 2 form another sealing position, and the gap between the first end surface 31 and the second end surface 21 is located between the two sealing positions in the radial direction. If the gap flows out of the medium, the medium will be sealed and blocked by the two sealing positions when it flows outward, thereby preventing leakage.

[0043] It can be seen that this solution is to prevent the medium from leaking from the gap between the first end surface 31 and the second end surface 21 to the direction of the second component 2a. Figure 8 , 12 The installation direction of the sealing gasket 6 can be changed according to different application occasions, and the installation direction of the sealing gasket 6 can still be changed. Figure 8 From a perspective, if the medium is prevented from flowing to the left, the first gasket portion 61 of the sealing gasket 6 may abut against the first end surface 31 , and the second gasket portion 62 of the sealing gasket 6 may abut against the second surface portion 51 a 2 .

[0044] like Fig.14 As shown, Fig.14 It is a partial schematic diagram of a base 5 with a split structure in an embodiment of the present application being arranged in a valve device.

[0045] In addition, in this embodiment, the base 5 is an integrated structure, the first face 51a1 and the second face 51a2 are coplanar, and the base 5 can also be a split structure, for example, including a third component 511 and a fourth component 512 arranged adjacently, the first face 51a1 is located in the third component 511, the second face 51a2 is located in the fourth component 512, and the fourth component 512 can be sleeved on the outer peripheral side of the third component 511. The base 5 is a split structure, and with the sealing gasket 6, it can also prevent the fluid from leaking out, and can also prevent the external fluid from entering the chamber where the injection nozzle 301 is located.

[0046] In this embodiment, the chamber defined by one surface of the sealing gasket 6 in the thickness direction is fluidly isolated from the chamber defined by the other surface of the sealing gasket 6 in the thickness direction. Figure 8 As shown, the chamber defined by the lower surface in the thickness direction of the sealing gasket 6 is connected to the gap between the first component 3a and the second component 2a, and the chamber defined by the upper surface is installed with the base 5. The two chambers are fluidly isolated in this article, which means that in the valve device, the two chambers are not connected, and the fluid does not interact between the two chambers.

[0047] It can be seen that when the sealing gasket 6 in this embodiment seals the second end face 21 of the valve body 2 and the first end face 31 of the injection nozzle 301, even if the first end face 31 and the second end face 21 are not flush but have a certain height deviation, the sealing performance of the sealing gasket 6 is not affected, as long as the sealing gasket 6 can be squeezed between the base 51 and the valve body 2 along the axial direction, thereby reducing the assembly requirements for the valve body 2 and the injection nozzle 301, and the sealing effect is still guaranteed when the first end face 31 and the second end face 21 are not flush due to assembly errors. Of course, the assembly error should still be minimized during assembly to meet the structural requirements, and the height difference between the first end face 31 and the second end face 21 should be controlled to be less than 0.05mm as much as possible.

[0048] In addition, in this embodiment, along the axial direction of the sealing structure, the orthographic projection of the second gasket portion 62 on the surface where the first surface 51a1 is located is located inside the orthographic projection of the second end surface 21 on the surface where the first surface 51a1 is located, and the orthographic projection of the first gasket portion 61 on the first surface 51a1 is located inside the first surface 51a1, that is, the first gasket portion 61 completely abuts against the first surface 51a1, and the second gasket portion 62 completely abuts against the second end surface 21. Compared with using a conventional larger flat gasket to abut and seal with both the first component and the second component, the sealing gasket 6 provided in the embodiment of the present invention is provided in the present invention by setting the first gasket portion 61 to completely abut against the first surface 51a1 and the second gasket portion 62 to completely abut against the second end surface 21. The diameter of the sealing portion for sealing abutment of the sealing gasket 6 of this structure does not need to be set too large, which can reduce the possibility of leakage, and the abutment area between the sealing gasket 6 and the base 51 is small, which is convenient for reducing the installation torque of the base 51.

[0049] The valve device in this embodiment is explained by taking an injector as an example. It can be known that other types of valve devices or non-valve devices can also be used. The first component 3a and the second component 2a are not limited to the injection nozzle 301 and the valve body 2. Whenever the first component 3a and the second component 2a are arranged adjacent to each other and the gap between them needs to be sealed, the sealing gasket 6 in this embodiment can be used in conjunction with the base 5 for sealing to eliminate the influence of the height difference between the first end face 31 of the first component 3a and the second end face 21 of the second component 2a on the sealing.

[0050] In detail, the first gasket portion 61 of the sealing gasket 6 abuts against the base 5, and the second gasket portion 62 abuts against the second end face 21, so the first gasket portion 61 and the second gasket portion 62 have a height difference in the axial direction, and the third gasket portion 63 is used to connect the first gasket portion 61 and the second gasket portion 62 of different heights. The three can be an integrated structure, for example, formed integrally by a rubber material to have good elasticity and achieve reliable sealing; or the material of the sealing gasket 6 can include one or a combination of stainless steel and rubber materials. Specifically, as Fig.11 As shown, the third gasket portion 63 of the sealing gasket 6 and the first gasket portion 61 and the second gasket portion 62 all have an obtuse angle, so that the third gasket portion 63 is obliquely arranged between the first gasket portion 61 and the second gasket portion 62, and try to ensure that the first gasket portion 61 and the second gasket portion 62 have a certain radial spacing, so that the gap between the first gasket portion 61 and the second gasket portion 62 and the first end face 31 and the second end face 21 in the radial direction can maintain a necessary spacing to improve the reliability of the sealing.

[0051] like Fig.11 , 12 As shown, in this embodiment, the first end face 31, the second end face 21 and the third end face 51a are parallel to each other and extend radially. The first gasket portion 61 and the second gasket portion 62 are parallel to the three end faces, so that when the first gasket portion 61 contacts the base 5 and the second gasket portion 62 contacts the second end face 21, they can have a larger contact area, which is conducive to achieving sealing.

[0052] Look again Fig.15 , Fig.15 It is a schematic structural diagram of a sealing gasket 6 in another embodiment of the present application.

[0053] Fig.12 In the embodiment, the first end face 31, the second end face 21 and the third end face 51a are parallel to each other. Fig.15 In the embodiment, the first gasket portion 61 and the second gasket portion 62 both have angles with the three end surfaces, and before the sealing gasket 6 is assembled with the valve body 2, the base 5 and the injection nozzle 301, the free end of the first gasket portion 61 first contacts the first end surface 31 of the base 5, and the free end of the second gasket portion 62 first contacts the second end surface 21 of the second component 2a. Fig.11 In the embodiment, Fig.15The first gasket part 61 and the second gasket part 62 have a larger angle with the third gasket part 63. Taking the radial direction when supported on the second end face 21 as the reference, before the assembly is completed, the first gasket part 61 and the second gasket part 62 have an angle with the radial direction. Among them, one end of the first gasket part 61 is connected to the third gasket part 63, and the other end of the first gasket part 61 is its free end. Similarly, one end of the second gasket part 62 is connected to the third gasket part 63, and the other end of the second gasket part 62 is its free end. It can be seen that before the assembly is completed, Fig.15 The free ends of the first gasket portion 61 and the second gasket portion 62 are opposite to each other. Fig.11 More "tilted", the first gasket part 61 tilts upward, and the second gasket part 62 tilts downward. In this way, when the base 5 is pressed axially toward the valve body 2, the first face 51a1 of the base 5 and the second end face 21 of the valve body 2 will first press against the free ends of the two gasket parts, and then gradually press against the corresponding entire first gasket part 61 or second gasket part 62 surface, so as to ensure a larger pressing contact area and ensure a sealing effect. After installation, the first gasket part 61 and the second gasket part 62 can be completely pressed against the corresponding first face 51a1 and the second end face 21 in parallel, or they can be partially pressed against each other, and there is still an angle.

[0054] like Fig.16 As shown, Fig.16 FIG. 6 is a partial schematic diagram of another structure of a sealing gasket 6 disposed in a valve device. Further, at least one of the first gasket portion 61 and the second gasket portion 62 may be provided with a rib for abutting sealing. Fig.16 As shown, a first annular rib 611 can be provided on one side surface of the first gasket portion 61 facing the base 5, and a second annular rib 621 can also be provided on one side surface of the second gasket portion 62 facing the second end surface 21. The first rib 611 abuts against the first face portion 51a1 or the first end surface 31, and the second rib 621 contacts the second face portion 51a2 or the second end surface 21. The ribs are pressed tightly to increase the local pressure of the ribs and improve the sealing performance. There can be multiple ribs, and the multiple annular ribs are distributed radially to form multiple sealing lines distributed radially.

[0055] Look again Fig.12 , and combined with Fig.17 , 18 understand, Fig.17 for Figure 5 A schematic diagram of the middle base 5; Fig.18 for Figure 5 Schematic diagram of the locking nut 4.

[0056] The base 5 in the embodiment of the present application includes an annular base 51, the inner side of the base 51 has a cylindrical portion 52 extending axially, the valve device also includes a locking nut 4, the valve body 2 has an internal thread, the locking nut 4 has an external thread matching the internal thread, the locking nut 4 is located between the cylindrical portion 52 and the valve body 2, the locking nut 4 and the valve body 2 are threadedly matched so that the locking nut 4 presses the upper end surface of the base 51 downward, thereby locking and fixing the base 5 and the valve body 2, and pressing the sealing gasket 6. Among them, the bottom end surface of the base 51 away from the cylindrical portion 52 is the third end surface 51a. It can be seen that the base 5 is not limited to this, for example, the cylindrical portion 52 is not provided, and it is not limited to being locked by the locking nut 4, for example, the base 5 can be pressed axially by other locking components such as locking screws.

[0057] Optionally, the material of the valve body 2 may include aluminum alloy, and the material of the locking nut 4 may include stainless steel. After the locking nut 4 is threadedly connected to the valve body 2, the two may be welded together. When the fluid flowing through the valve device is a high-pressure fluid such as carbon dioxide, the connection between the locking nut 4 and the valve body 2 is set to be welding plus thread tightening, which can effectively reduce the requirements for welding strength. Therefore, the thread bears most of the axial load, while the external weld bears a small amount of load, which reasonably distributes the load-bearing capacity and ensures the reliability of the connection strength; in addition, the weld can also prevent leakage and act as a seal.

[0058] In addition, if Figure 8 As shown, the cylindrical portion 52 of the base 5 covers a portion of the injection nozzle 301, and the outer wall of the injection nozzle 301 has two step surfaces facing oppositely, namely the first step surface and the second step surface 32, and the first step surface facing the base 5 is the first end surface 31 mentioned above. The inner wall of the end of the valve body 2 close to the control head 1 has a secondary step portion, and the primary step surface 22 of the secondary step portion abuts the second step surface 32 of the injection nozzle 301, and the secondary step surface of the secondary step portion is the second end surface 21. In this arrangement, the primary step surface 22 of the valve body 2 abuts the second step surface 32 of the injection nozzle 301, and the secondary step surface (i.e., the second end surface 21) of the valve body 2 abuts the sealing gasket 6. The valve body 2 provides two installation positions, and the structure is relatively simple and compact.

[0059] Specific examples are used herein to illustrate the principles and implementation methods of the present application, and the description of the above embodiments is only used to help understand the method and core ideas of the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A valve device, It is characterized in that The valve body (2) comprises a valve body (2), a valve core (3) and a base (5), wherein the valve body (2) has a valve cavity (201), wherein at least a portion of the valve core (3) is inserted into the valve cavity (201), wherein the valve core (3) comprises a first component (3a), and wherein the valve body (2) comprises a second component (2a); wherein the first component (3a) has a first end surface (31), and the second component (2a) has a second end surface (21), wherein the first end surface (31) and the second end surface (21) are arranged adjacent to each other, and wherein the base (5) has a first face portion (51a1) and a second face portion (51a2), wherein the first face portion (51a1) and the first end surface (31) are opposite to each other, and wherein the second face portion (51a2) and the second end surface (21) are opposite to each other; The valve device also includes a sealing gasket (6), which includes a first gasket portion (61), a second gasket portion (62) and a third gasket portion (63), wherein the third gasket portion (63) connects the first gasket portion (61) and the second gasket portion (62); the first gasket portion (61) abuts against the first face portion (51a1), and the second gasket portion (62) abuts against the second end face (21), or the first gasket portion (61) abuts against the first end face (31), and the second gasket portion (62) abuts against the second face portion (51a2).

2. The valve device according to claim 1, It is characterized in that The second component (2a) is sleeved on at least part of the outer circumference of the first component (3a); the first end surface (31), the second end surface (21), the first surface (51a1), and the second surface (51a2) are all annular; The orthographic projection of the second gasket portion (62) on the surface where the second surface portion (51a2) is located is located inside the orthographic projection of the second end surface (21) on the surface where the second surface portion (51a2) is located.

3. The sealing structure according to claim 1 or 2, It is characterized in that The base (5) is an integral structure, and the first surface (51a1) and the second surface (51a2) are coplanar; Alternatively, the base (5) includes a third component (511) and a fourth component (512) that are adjacently arranged, the first surface portion (51a1) is located on the third component (511), the second surface portion (51a2) is located on the fourth component (512), the fourth component (512) is sleeved on the outer peripheral side of the third component (511), and along the axial direction of the sealing structure, the orthographic projection of the first gasket portion (61) on the first surface portion (51a1) is located inside the first surface portion (51a1).

4. The sealing structure according to claim 1 or 2, It is characterized in that The chamber defined by one surface in the thickness direction of the sealing gasket (6) is fluidically isolated from the chamber defined by the other surface in the thickness direction of the sealing gasket (6), and the chamber defined by one surface in the thickness direction of the sealing gasket (6) is connected to the gap between the first component (3a) and the second component (2a).

5. The sealing structure according to any one of claims 1 to 4, It is characterized in that The third gasket portion (63) and the first gasket portion (61) and the second gasket portion (62) all have an obtuse angle.

6. The sealing structure according to any one of claims 1 to 4, It is characterized in that The first end surface (31), the second end surface (21), the first surface (51a1), and the second surface (51a2) are all parallel to each other; The first gasket portion (61) and the second gasket portion (62) are both parallel to the four face portions; or at least one of the first gasket portion (61) and the second gasket portion (62) is arranged at an angle to the four face portions.

7. The valve device according to claim 1, It is characterized in that The base (5) includes an annular base (51), the inner side of which has a cylindrical portion (52) extending axially, and the valve device also includes a locking nut (4), wherein the locking nut (4) is located between the cylindrical portion (52) and the valve body (2), the inner wall of the valve body (2) is provided with an internal thread, the locking nut (4) has an external thread matching the internal thread, and the locking nut (4) is threadedly matched with the valve body (2) to press the base and the valve body (2); the bottom end surface of the base (51) away from the cylindrical portion (52) includes the first surface portion (51a1) and the second surface portion (51a2).

8. The valve device according to claim 7, It is characterized in that The cylindrical portion (52) of the base (5) is sheathed around a portion of the valve core (3); the end of the valve body (2) has a secondary step portion, the outer wall of the valve core (3) has a step surface, the primary step surface (22) of the secondary step portion abuts against the step surface (32) of the valve core (3), and the secondary step surface of the secondary step portion is the second end surface (21).

9. The valve device according to claim 7 or 8, It is characterized in that The valve device is an injector, and the valve core (3) is an injection nozzle (301) of the injector.

10. A sealing structure, It is characterized in that The invention comprises a first component (3a), a second component (2a) and a base (5), wherein the first component (3a) has a first end surface (31), the second component (2a) has a second end surface (21), the base (5) has a first face portion (51a1) and a second face portion (51a2), the first face portion (51a1) and the second face portion (51a2) are arranged adjacent to each other, the first end surface (31) and the second end surface (21) are arranged adjacent to each other, the first face portion (51a1) and the first end surface (31) are opposite to each other, and the second face portion (51a2) and the second end surface (21) are opposite to each other; The sealing structure also includes a sealing gasket (6), which includes a first gasket portion (61), a second gasket portion (62) and a third gasket portion (63), wherein the third gasket portion (63) connects the first gasket portion (61) and the second gasket portion (62); the first gasket portion (61) abuts against the first face portion (51a1), and the second gasket portion (62) abuts against the second end face (21), or the first gasket portion (61) abuts against the first end face (31), and the second gasket portion (62) abuts against the second face portion (51a2).

Images