Self-riveting limiting sealing structure

Abstract

The utility model discloses a self-riveting limit sealing structure, which comprises a valve body and an end cover, the valve body is provided with a valve hole, the end cover is matched with the valve body and assembled at the valve hole of the valve body, and the end cover is provided with a multi-stage sealing section for performing multi-stage sealing on the valve hole. The multi-stage sealing section comprises a conical section sealing part, a groove section sealing part and a cylindrical section sealing part; wherein the conical section sealing part comprises a first conical section sealing part and a second conical section sealing part; the cylindrical section sealing part comprises a first cylindrical sealing part and a second cylindrical sealing part; during sealing, the first conical section sealing part, the first cylindrical sealing part, the groove section sealing part, the second conical section sealing part and the second cylindrical sealing part are sequentially inserted into the valve hole through the valve body opening. The problems that an existing sealing structure is concentrated in press fitting force, poor in sealing effect and prone to falling off are solved, the press fitting force is dispersed, and the sealing effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing devices, in particular to a self-riveting limiting sealing structure suitable for sealing between an end cover and a valve body. Background Art

[0002] Valve body sealing is a commonly used assembly sealing method in the mechanical assembly process. The end cover is usually pressed into the valve hole of the valve body by press-fitting. The current press-fit seal usually adopts a single conical interference fit structure. By controlling the size and displacement of the press-fitting force, the press-fit seal between the end cover and the valve body is achieved.

[0003] In order to improve the sealing effect, it is usually necessary to increase the press-fitting force and increase the interference fit between the end cover and the valve body, which requires the use of larger press-fitting equipment, resulting in increased production costs.

[0004] In addition, the press-fitting sealing method currently used cannot effectively control the press-fitting force and press-fitting displacement, and there is a problem of overpressure. Overpressure will cause damage to the end cover, affecting the service life and use effect of the valve body and the end cover.

[0005] Based on the above problems existing in the prior art, designing a sealing structure that can disperse the pressing force, has a good sealing effect, and is not easy to fall off becomes the problem to be solved by this application. Utility Model Content

[0006] The utility model aims to provide a self-riveting limiting sealing structure, which can effectively disperse the pressing force during the pressing process, realize self-sealing during assembly, have good sealing effect, and is not easy to fall off.

[0007] In order to solve the above technical problems, the present application provides a self-riveting limited sealing structure, which is mainly composed of an end cover and a valve body. The end cover is matched with the valve body, and a valve hole is arranged on the valve body; the end cover is assembled at the valve hole of the valve body. The end cover is provided with multiple sealing sections along its axial direction to achieve multi-stage sealing of the valve hole.

[0008] In addition to the above-mentioned technical solutions, this application also makes improvements in the following aspects:

[0009] In some embodiments, the multi-stage sealing section includes a conical section sealing portion, a groove section sealing portion, and a cylindrical section sealing portion. The conical section sealing portion is provided with a first conical section sealing portion and a second conical section sealing portion, and the two conical sealing portions are provided to realize segmented press-fitting and disperse the press-fitting force during the press-fitting process.

[0010] In addition, the cylindrical segment sealing portion is also provided in two parts, namely a first cylindrical sealing portion and a second cylindrical sealing portion.

[0011] When sealing, the first conical section sealing part, the first cylindrical sealing part, the groove section sealing part, the second conical section sealing part, and the second cylindrical sealing part are sequentially inserted into the valve hole through the valve body opening.

[0012] In some embodiments, the first tapered section sealing portion includes a tapered insertion end and a tapered transition end, and the outer diameter of the first tapered section sealing portion gradually increases from the tapered insertion end to the tapered transition end.

[0013] The outer diameter of the insertion end of the first conical section sealing portion is smaller than the opening diameter of the valve hole; and the outer diameter of the transition end of the first conical section sealing portion is larger than the diameter of the valve hole.

[0014] In some embodiments, the first tapered segment sealing portion transitions to the first cylindrical sealing portion via a tapered transition end of the first tapered segment sealing portion, and an outer diameter of the first cylindrical sealing portion is greater than a diameter of the valve hole.

[0015] Corresponding to the first cylindrical sealing part, a second limiting groove is arranged in the valve hole. After sealing, the first cylindrical sealing part is clamped in the second limiting groove to form a bite limiting sealing structure.

[0016] In some embodiments, the groove section sealing portion is arranged between the first cylindrical sealing portion and the second conical section sealing portion; during the process of pressing the end cover into the valve hole, the material chips generated by the extrusion of the end cover side wall and the inner wall of the valve hole enter the groove section sealing portion to form a secondary bite limit sealing structure.

[0017] In some embodiments, the outer diameter of the second tapered section sealing portion is greater than the inner diameter of the valve hole, and the minimum outer diameter of the second tapered section sealing portion is greater than the outer diameter of the first cylindrical section sealing portion.

[0018] In some embodiments, a first limiting step is formed between the second conical section sealing portion and the second cylindrical sealing portion. Corresponding to the first limiting step, a first limiting groove is provided at the valve hole opening of the valve body, and the second cylindrical sealing portion is embedded in the first limiting groove.

[0019] In some embodiments, a second limiting step is provided at the junction of the valve hole and the bottom of the end cover.

[0020] In some implementations, the inner diameter of the valve hole corresponding to the second limiting step is larger than the bottom outer diameter of the end cover.

[0021] Beneficial effects of the utility model:

[0022] 1. In the present application, a first conical section sealing part and a second conical section sealing part are provided, and the two conical section sealing parts are provided to realize segmented press-fitting. First, the first conical section sealing part contacts the valve hole of the valve body, and a pre-pressure is applied to the first conical section sealing part. During the first pre-pressure application, the second conical section sealing part gradually enters the valve hole to complete the secondary press-fitting. Since a certain pre-stress is applied to the hole wall during the first press-fitting, the secondary press-fitting disperses the press-fitting force during the press-fitting process, thereby solving the problem of concentrated or excessive press-fitting force in the existing assembly of the end cover and the valve body.

[0023] 2. In the present application, the outer diameter of the first conical section sealing part is set to gradually increase from the conical insertion end to the conical transition end, and the outer diameter of the insertion end is smaller than the valve hole opening diameter; the outer diameter of the transition end is larger than the valve hole diameter. The first conical section sealing part is designed as follows: on the one hand, the design of the conical structure of the insertion end plays a guiding role, and the insertion end diameter is smaller than the valve hole, which is convenient for insertion and convenient for correcting the tilt angle when the end cover is placed; on the other hand, the outer diameter of the transition end is designed to be larger than the diameter of the valve hole, in order to achieve the segmented application of prestress during the assembly process of the end cover and the valve body.

[0024] 3. In the present application, the first cylindrical sealing part is clamped in the second limiting groove to form an interlocking limiting sealing structure. At the same time, during the process of pressing the end cover into the valve hole, the material scraps generated by the extrusion between the side wall of the end cover and the inner wall of the valve hole enter the groove section sealing part to form a secondary interlocking limiting sealing structure. The design of the interlocking structure can prevent the end cover from falling off and ensure the sealing after pressing.

[0025] 4. The present application sets a first limit step and a second limit step at the bottom and end surface of the valve hole respectively. The distance between the two limit steps can be adjusted according to different product specifications, thereby controlling the displacement of the end cover during the press-fitting process. When the end cover contacts the second limit step, the press-fitting force increases rapidly, which can buffer the equipment pressure head and effectively avoid over-pressing. In addition, the setting of the second limit step makes it convenient to directly observe whether the end cover is pressed into place. It is convenient for quality inspection. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings described herein are used to provide further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0027] Figure 1 This is a schematic diagram of the combined structure of a self-riveting limiting sealing structure according to an embodiment of the present application;

[0028] Figure 2 A cross-sectional view of an end cover of an embodiment of the present application;

[0029] Figure 3 This is a cross-sectional view of a valve body according to an embodiment of the present application;

[0030] Figure 4 for Figure 3 A partial enlarged view of middle A;

[0031] Figure 5 This is a partial cross-sectional view of an embodiment of the present application after the end cover and the valve body are press-fitted;

[0032] Figure 6 This is a schematic diagram of the initial state of the initial press-fitting of the end cover and the valve body in the first embodiment of the present application;

[0033] Figure 7 This is a schematic diagram of the intermediate press-fit state of the end cover and the valve body in the first embodiment of the present application;

[0034] Figure 8 This is a diagram of the fully pressed-fit state of the end cover and the valve body in an embodiment of the present application.

[0035] The numbers in the figure are as follows:

[0036] 1. Valve body; 2. End cover; 3. Valve hole; 31. First limiting groove; 32. Second limiting groove; 4. First conical section sealing portion; 41. Conical insertion end; 42. Conical transition end; 5. Second conical section sealing portion; 6. First cylindrical sealing portion; 7. Second cylindrical sealing portion; 8. Groove section sealing portion; 9. First limiting step; 10. Second limiting step. DETAILED DESCRIPTION

[0037] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is not intended to be any limitation on the present application and its application or use. The present application can be implemented in other different forms and is not limited to the embodiments described herein.

[0038] 1. Explanation of Descriptive Terms in This Application

[0039] The embodiments provided in this application in conjunction with the technical solutions are intended to make this application more thorough and complete, and to fully convey the scope of this application to those skilled in the art. It should be noted that unless otherwise specifically stated in this application, the relative arrangement of components described in these embodiments should be interpreted as merely exemplary, and not as a limitation to the technical solutions of this application.

[0040] If the directional terms such as "upper", "lower", "left", "right", "bottom", "top" etc. are used in this application, they are defined relative to the directions in the drawings and are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. These or other directional terms should not be understood as restrictive terms.

[0041] In the present application, when a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other device without an intermediate device, or may not be directly connected to the other device but have an intermediate device.

[0042] In addition, this application does not discuss in detail the technologies and equipment known to ordinary technicians in the relevant fields, but where appropriate, the technologies and equipment should be considered as part of the specification.

[0043] The application scenario of the present application is mainly based on the assembly of the end cover and the valve body, and can also be applied to other scenarios according to its function. Its application scenario is not restricted or limited by the specific embodiments described in this application.

[0044] 2. Based on the problems of concentrated pressing force, poor sealing effect and easy falling off of the end cover in the existing valve body sealing process, this application specifically provides a technical solution to the above problems. The technical solution, working principle and technical effect of this application are described in detail below in combination with specific embodiments.

[0045] Embodiment 1

[0046] The utility model records a self-riveting limiting sealing structure, which is applied to the sealing of a valve body 1 and an end cover 2.

[0047] The self-riveting limiting sealing structure achieves self-riveting limiting and multi-stage sealing effects through an optimized design of its own structure. The press-fitting process can effectively disperse the press-fitting force, thereby solving the problem of press-fitting force concentration during the sealing process of the existing valve body 1.

[0048] like Figure 1 As shown, the self-riveting limiting sealing structure involved in this embodiment includes a valve body 1 and an end cover 2, and the external shape and structure of the valve body 1 itself are not described in detail.

[0049] The improvements of the present application are mainly based on the improvement of the structure of the end cover 2. In order to meet the requirements of the sealing effect of the end cover 2, the structure of the valve hole 3 of the valve body 1 matched with the end cover 2 is also adaptively improved locally.

[0050] The valve body 1 is provided with a valve hole 3, which is a through structure, penetrating the entire valve body 1, and forming openings on the corresponding two sides of the valve body 1. Of course, depending on the different structural designs of the valve body 1 itself, it is also applicable to the valve body 1 with a single hole structure. During assembly, the end cover 2 needs to be pressed onto the two openings of the valve body 1 to seal the valve hole 3.

[0051] In order to improve the sealing effect of the end cover 2 on the valve hole 3, a multi-stage sealing section is provided at the connection end between the end cover 2 and the valve hole 3, and the multi-stage sealing section can achieve multi-stage sealing of the valve hole 3.

[0052] like Figure 2 As shown, according to the structural design of the valve hole 3 of the valve body 1 and the sealing effect requirements to be achieved, the present application sets the multi-stage sealing section of the end cover 2 as a conical section sealing portion, a groove section sealing portion 8 and a cylindrical section sealing portion, which respectively seal the valve hole 3 step by step.

[0053] The conical section sealing part is provided with two sections, namely the first conical section sealing part 4 and the second conical section sealing part 5, and the two conical section sealing parts respectively realize secondary press-fitting sealing.

[0054] The groove section sealing part 8 and the cylindrical section sealing part are the transition sections for the secondary press-fitting seal. The cylindrical section sealing part is also provided in two sections, namely the first cylindrical sealing part 6 and the second cylindrical sealing part 7.

[0055] During sealing, the first conical section sealing part 4 , the first cylindrical sealing part 6 , the groove section sealing part 8 , the second conical section sealing part 5 , and the second cylindrical sealing part 7 are sequentially inserted into the valve hole 3 through the open port of the valve body 1 .

[0056] Under the action of the press-fitting force, the first tapered section sealing portion 4 is first inserted into the corresponding valve hole 3. The first tapered section sealing portion 4 is provided with a tapered insertion end 41 and a tapered transition end 42. In terms of structural design, the outer diameter of the first tapered section sealing portion 4 gradually increases from the tapered insertion end 41 to the tapered transition end 42.

[0057] In order to facilitate insertion into the valve hole 3, the outer diameter of the tapered insertion end 41 of the first tapered section sealing portion 4 is smaller than the opening diameter of the valve hole 3. The tapered structure design can play a guiding role and also correct the end cover 2 to prevent the end cover 2 from being offset and affecting the press-fitting effect.

[0058] The outer diameter of the tapered transition end 42 of the first tapered section sealing portion 4 is designed to be larger than the diameter of the valve hole 3. During the press-fitting process, when the tapered transition end 42 of the first tapered section sealing portion 4 passes through the valve hole 3, it will apply the first press-fitting prestress to the inner wall of the valve hole 3, and at the same time have the effect of expanding the hole, preparing for the subsequent press-fitting of the second tapered section sealing portion 5.

[0059] The second conical sealing section can realize secondary press-fit sealing for the valve hole 3 .

[0060] In terms of structural design, the outer diameter of the second conical section sealing portion 5 is larger than the inner diameter of the valve hole 3, and the minimum outer diameter of the second conical section sealing portion 5 is larger than the outer diameter of the first cylindrical section sealing portion. The purpose of designing the minimum outer diameter of the second conical section sealing portion to be larger than the outer diameter of the first cylindrical section sealing portion is to apply a secondary press-fitting force, thereby improving the sealing effect between the end cover 2 and the valve hole 3.

[0061] In summary, the two conical sealing parts are arranged to realize segmented press-fitting. First, the first conical sealing part 4 contacts the valve hole 3 of the valve body 1, and a pre-pressure is applied to the first conical sealing part 4 and the valve hole. During the first pre-pressure application process, the second conical sealing part 5 gradually enters the valve hole 3 to complete the second press-fitting. Since the first press-fitting applies a certain pre-stress to the hole wall, the second press-fitting disperses the press-fitting force during the press-fitting process, effectively avoiding the concentration of the press-fitting force.

[0062] like Figure 1 , Figure 3 , Figure 4 As shown, in order to further improve the sealing effect between the end cover 2 and the valve hole 3, the first conical section sealing part 4 transitions to the first cylindrical sealing part 6 via the conical transition end 42 of the first conical section sealing part 4, the outer diameter of the first cylindrical sealing part 6 is larger than the diameter of the valve hole 3, and the first cylindrical sealing part 6 is installed in conjunction with the second limiting groove 32 provided in the valve hole 3, and the first cylindrical sealing part 6 is clamped in the second limiting groove 32 to form an occlusal limiting sealing structure. This design can play a limiting role, making the installation of the valve cover and the valve body 1 more secure, and avoiding the problem of the valve cover loosening and falling off when the valve cover is in a vibrating state.

[0063] The groove segment sealing portion 8 is an intermediate sealing structure, and is disposed between the first cylindrical sealing portion 6 and the second conical segment sealing portion 5. During the process of pressing the end cover 2 into the valve hole 3, the material scraps generated by the extrusion between the side wall of the end cover 2 and the inner wall of the valve hole 3 enter the groove segment sealing portion 8, forming a secondary bite limit sealing structure.

[0064] The bite-limiting structure formed by the first cylindrical sealing portion 6 and the second limiting groove 32 and the bite-limiting structure formed after the material chips produced by the extrusion of the side wall of the end cover 2 and the inner wall of the valve hole 3 enter the groove section sealing portion 8 form an interactive bite-limiting structure, which can prevent the end cover 2 from falling off, thereby ensuring the sealing after pressing.

[0065] In order to prevent overpressure during the press-fitting process, a first limiting step 9 is formed between the second conical section sealing portion 5 and the second cylindrical sealing portion 7. Corresponding to the first limiting step 9, a first limiting groove 31 is arranged at the opening of the valve hole 3 of the valve body 1, and the second cylindrical sealing portion 7 of the end cover 2 is embedded in the first limiting groove 31. A gap is arranged between the circumferential side wall of the first limiting groove 31 and the side wall of the second cylindrical sealing portion 7, so that the press-fitting effect can be observed with the naked eye for quality inspection.

[0066] In order to effectively control the displacement of the press-fitted end cover 2, a second limiting step (10) is provided at the junction of the valve hole (3) and the bottom of the end cover (2); the inner diameter of the valve hole corresponding to the second limiting step is larger than the outer diameter of the bottom of the end cover; by adjusting the distance between the first limiting step 9 and the second limiting step 10, over-pressure assembly can be further avoided.

[0067] In combination with the above structural design, the specific press-fitting process of the end cover 2 and the valve body 1 in this example is as follows:

[0068] like Figure 6 As shown, when the end cover 2 is just placed in the valve hole 3, under the action of pressure, the first conical section sealing portion 4 of the end cover 2 first enters the valve hole 3. The conical section sealing portion has a guiding effect when pressed in, and can also adjust the problem of the end cover 2 being tilted when placed.

[0069] like Figure 7 As shown, the end cover 2 enters the valve hole 3, and the front end of the end cover 2 will first squeeze the valve hole 3 to expand the hole, and then pass through the groove section sealing part 8, and the second section of the conical section sealing part 5 will squeeze the valve hole 3 again, and at the same time squeeze the squeezed material chips into the groove section sealing part 8.

[0070] like Figure 8 As shown, the end cover 2 is pressed to the first limiting step and the second limiting step in sequence, and the second cylindrical sealing portion 7 of the end cover 2 is embedded in the first limiting groove of the valve body 1, as shown in FIG. Figure 5 As shown, the end cover 2 and the valve body 1 are completely pressed together.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0072] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field; when the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

Claims

1. A self-riveting limiting sealing structure, comprising: A valve body (1) is provided with a valve hole (3); An end cover (2) is provided in conjunction with the valve body (1) and is assembled at the valve hole (3) of the valve body (1); It is characterized in that The end cover (2) is provided with a multi-stage sealing section, which performs multi-stage sealing on the valve hole (3).

2. The self-riveting limiting sealing structure according to claim 1 is characterized in that: The multi-stage sealing section comprises a conical section sealing portion, a groove section sealing portion (8), and a cylindrical section sealing portion; in, The conical segment sealing portion comprises a first conical segment sealing portion (4) and a second conical segment sealing portion (5); The cylindrical segment sealing portion comprises a first cylindrical sealing portion (6) and a second cylindrical sealing portion (7); When sealing, the first conical section sealing part (4), the first cylindrical sealing part (6), the groove section sealing part (8), the second conical section sealing part (5), and the second cylindrical sealing part (7) are sequentially inserted into the valve hole (3) through the open mouth of the valve body (1).

3. The self-riveting limiting sealing structure according to claim 2 is characterized in that: The first conical section sealing portion (4) comprises a conical insertion end (41) and a conical transition end (42), and the outer diameter of the first conical section sealing portion (4) gradually increases from the conical insertion end (41) to the conical transition end (42); The outer diameter of the conical insertion end (41) of the first conical section sealing portion (4) is smaller than the diameter of the valve hole (3); and the outer diameter of the conical transition end (42) of the first conical section sealing portion (4) is larger than the diameter of the valve hole (3).

4. The self-riveting limiting sealing structure according to claim 3 is characterized in that: The first conical section sealing portion (4) transitions to the first cylindrical sealing portion (6) via a conical transition end (42) of the first conical section sealing portion (4), and the outer diameter of the first cylindrical sealing portion (6) is greater than the diameter of the valve hole (3); Corresponding to the first cylindrical sealing portion (6), a second limiting groove (32) is provided in the valve hole (3); After sealing, the first cylindrical sealing portion (6) is clamped in the second limiting groove (32) to form a bite-limiting sealing structure.

5. The self-riveting limiting sealing structure according to claim 2, characterized in that: The groove segment sealing portion (8) is arranged between the first cylindrical sealing portion (6) and the second conical segment sealing portion (5); During the process of pressing the end cover (2) into the valve hole (3), material scraps generated by the extrusion between the side wall of the end cover (2) and the inner wall of the valve hole (3) enter the groove section sealing portion (8), forming a secondary bite limit sealing structure.

6. The self-riveting limiting sealing structure according to claim 2, characterized in that: The outer diameter of the second conical section sealing portion (5) is greater than the inner diameter of the valve hole (3), and the minimum outer diameter of the second conical section sealing portion (5) is greater than the outer diameter of the first cylindrical sealing portion (6).

7. The self-riveting limiting sealing structure according to claim 2, characterized in that: A first limiting step (9) is formed between the second conical section sealing portion (5) and the second cylindrical sealing portion (7); Corresponding to the first limiting step (9), a first limiting groove (31) is provided at the opening of the valve hole (3) of the valve body (1), and the second cylindrical sealing portion (7) is embedded in the first limiting groove (31).

8. The self-riveting limiting sealing structure according to claim 1, characterized in that: A second limiting step (10) is provided at the junction of the valve hole (3) and the bottom of the end cover (2).

9. The self-riveting limiting sealing structure according to claim 8, characterized in that: The inner diameter of the valve hole corresponding to the second limiting step is larger than the outer diameter of the bottom of the end cover.

Images