Pressure discharging and limiting valve

Abstract

The utility model provides a pressure discharging and limiting valve. The pressure discharging and limiting valve comprises a valve body; the shell completely wraps the valve body and forms an exhaust channel; the bottom of the shell is sunken upwards to form a first mounting step and a second mounting step in sequence, and is communicated with the exhaust channel; the first installation step sequentially comprises a first ring body, a second ring body and a third ring body from bottom to top, the inner diameter of the first ring body is smaller than that of the third ring body, the inner side wall of the second ring body is in a horn shape, and the two ends of the second ring body are connected with the inner side wall of the first ring body and the inner side wall of the third ring body respectively. The tip cone is fixed to the top of the shell and contained in the exhaust channel. The shape of the outer peripheral side of the gasket is matched with that of the inner peripheral side of the first mounting step, the gasket is clamped on the first mounting step, and the gasket and the second mounting step jointly define a mounting groove; and the elastic ring is fixedly accommodated in the mounting groove. Compared with the prior art, the pressure discharging and limiting valve is high in production and assembly efficiency.

Description

Technical Field

[0001] This utility model relates to the field of kitchenware accessories technology, and in particular to a pressure relief and pressure limiting valve used in pressure vessels such as electric pressure cookers for adjusting the pressure inside the container. Background Technology

[0002] In existing cooking appliances, especially pressure vessels such as electric pressure cookers, the pressure regulating device is generally a gravity-type pressure relief and limiting valve, which is usually used in conjunction with the exhaust rod fixed on the lid to adjust the pressure inside the electric pressure cooker and achieve pressure control and limiting.

[0003] The pressure relief and pressure limiting valve of the related technology includes an annular valve body, a housing that surrounds the valve body and forms an exhaust channel on the inner circumference of the valve body, a top cone fixed to the top of the housing and inserted into the exhaust channel, and an elastic ring installed and fixed to the bottom of the housing.

[0004] However, in the pressure relief valves of the relevant technology, when installing the silicone ring, a fixing groove needs to be formed at the bottom of the housing first. The silicone ring is usually fixed by an inverted snap-fit ​​method, that is, the opening size of the part forming the fixing groove is smaller than the internal size of the fixing groove. However, because of the inverted snap-fit ​​method, the fixing groove cannot be directly injection molded. Generally, a gasket with a fixing groove structure is prefabricated, and then the gasket is installed into the prefabricated part with the already injection-molded liner. Then, a second injection molding is performed to protect the gasket. This makes it impossible to automate the installation of the silicone ring in the existing pressure relief valves. It can only be installed manually, which limits the production efficiency.

[0005] Therefore, it is necessary to provide a new pressure relief and pressure limiting valve to solve the above problems. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a pressure relief and pressure limiting valve with high production efficiency.

[0007] To solve the above-mentioned technical problems, this utility model provides a pressure relief and pressure limiting valve, comprising:

[0008] Valve body, the valve body being annular;

[0009] The housing completely encloses the valve body and forms an exhaust channel on the inner side of the valve body. The bottom of the housing is concave upward to form a first mounting step and a second mounting step that are annular and coaxially arranged. Both the first mounting step and the second mounting step are connected to the exhaust channel. The first mounting step includes a first ring, a second ring, and a third ring in sequence from bottom to top along the axial direction of the housing. The inner sidewalls of the first ring and the third ring are parallel to the axial direction of the exhaust channel. The inner diameter of the first ring is smaller than the inner diameter of the third ring. The inner sidewall of the second ring is trumpet-shaped, and its two ends are respectively connected to the inner sidewalls of the first ring and the third ring.

[0010] A top cone, which is fixed to the top of the housing and housed within the exhaust channel;

[0011] A gasket, the gasket being annular, the outer peripheral shape of the gasket matching the inner peripheral shape of the first mounting step and being engaged with the first mounting step, the gasket and the second mounting step together forming a mounting groove; and...

[0012] An elastic ring is fixedly housed within the mounting groove.

[0013] Preferably, the outer periphery of the gasket includes, from bottom to top, a first ring wall, a second ring wall, and a third ring wall along its axial direction. The outer diameter of the first ring wall is smaller than the outer diameter of the third ring wall. The two ends of the second ring wall are respectively connected to the first ring wall and the third ring wall. When the gasket is engaged with the first mounting step, the first ring wall abuts against the inner wall of the first ring body, the second ring wall abuts against the inner wall of the second ring body, and the third ring wall abuts against the inner wall of the third ring body.

[0014] Preferably, the third annular wall of the gasket has a first chamfered structure at the end away from the second annular wall.

[0015] Preferably, the inner diameter of the second mounting step is smaller than the inner diameter of the first mounting step, and the end of the second mounting step near the first mounting step forms a second chamfer structure.

[0016] Preferably, the elastic ring is a silicone ring.

[0017] Preferably, the housing includes an inner shell and an outer shell. The inner shell includes a first section that fits against the inner circumference of the valve body and forms the exhaust channel, a second section that extends in an annular shape from the bottom end of the first section along the bottom wall of the valve body, and a third section that extends in an annular shape from the end of the second section away from the first section. The outer shell includes a body covering the top of the valve body, an inner extension wall and an outer extension wall extending downward from the body, a bottom extension wall extending from the end of the outer extension wall away from the body along the bottom of the third section, and a edging wall extending from the bottom extension wall along the inner side wall of the third section and abutting the bottom of the second section. The inner extension wall fits against the inner side wall of the first section, and the outer extension wall fits against the outer side wall of the valve body. The first mounting step is formed by the inner recess of the edging wall, and the edging wall abuts against the inner side wall of the third section and together forms the second mounting step.

[0018] Preferably, the inner circumferential side of the inner extension wall is provided with a slot communicating with the exhaust channel, and a top cone sleeve is installed in the slot. The top cone sleeve is fitted and fixed to the top cone and fixes the top cone into the slot.

[0019] Preferably, the housing and the valve body are integrally injection molded.

[0020] Compared with the prior art, the pressure relief and pressure limiting valve of this utility model has a first mounting step and a second mounting step that are concave upward at the bottom of the housing and are arranged in an annular shape and coaxially. The first mounting step includes a first ring body, a second ring body and a third ring body in sequence from bottom to top along the axial direction of the housing. The inner sidewalls of the first ring body and the third ring body are parallel to the axial direction of the exhaust channel, and the inner diameter of the first ring body is smaller than the inner diameter of the third ring body. The inner sidewall of the second ring body is trumpet-shaped, and its two ends are respectively connected to the inner sidewalls of the first ring body and the inner sidewalls of the third ring body, thereby forming a locking engagement. At the same time, the outer peripheral shape of the gasket matches the inner peripheral shape of the first mounting step and is locked in the first mounting step. The gasket and the second mounting step together form a mounting groove for fixing and accommodating the elastic ring. Through the above structural design, the gasket is improved to a non-inverted structure, and the gasket and the shell are not integrally injection molded, but are separately pressed and snapped together. During assembly, the elastic ring and the gasket can be aligned and clamped at the same time and pressed into the mounting groove and the first mounting step simultaneously, which can achieve fully mechanized and automatic installation and greatly improve production and assembly efficiency. Attached Figure Description

[0021] The present invention will now be described in detail with reference to the accompanying drawings. The above and other aspects of the present invention will become clearer and easier to understand through the detailed description in conjunction with the following drawings. In the drawings:

[0022] Figure 1 This is a schematic diagram of the structure of an embodiment of the pressure relief and pressure limiting valve of this utility model;

[0023] Figure 2 for Figure 1 Partial structural decomposition diagram;

[0024] Figure 3 This is a schematic diagram of the gasket structure of the pressure relief and limiting valve of this utility model. Detailed Implementation

[0025] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0026] The specific embodiments / exemplifications described herein are specific implementations of this utility model, used to illustrate the concept of this utility model, and are illustrative and exemplary, and should not be construed as limiting the implementation methods or scope of this utility model. In addition to the embodiments described herein, those skilled in the art can employ other obvious technical solutions based on the content disclosed in the claims and specification of this application. These technical solutions include those employing any obvious substitutions and modifications to the embodiments described herein, all of which are within the protection scope of this utility model.

[0027] The following descriptions of the embodiments are with reference to the accompanying drawings, illustrating specific embodiments in which the present invention can be implemented. Directional terms used in this invention, such as up, down, front, back, left, right, inside, outside, side, etc., are only for reference to the accompanying drawings. Therefore, the directional terms used are for illustration and understanding of the present invention, and not for limiting the present invention.

[0028] Please refer to Figure 1-3 As shown, this utility model provides a pressure relief and pressure limiting valve 100, including: valve body 1, housing 2, top cone 3, gasket 4, and elastic ring 5.

[0029] The valve body 1 is ring-shaped and is mainly used for counterweight.

[0030] The housing 2 completely encloses the valve body 1 and forms an exhaust channel 10 on the inner side of the valve body 1. In this embodiment, the housing 2 and the valve body 1 are integrally molded from plastic.

[0031] The bottom of the housing 2 is recessed upwards to form a first mounting step 21 and a second mounting step 22 that are annular and coaxially arranged. Both the first mounting step 21 and the second mounting step 22 are connected to the exhaust channel 10.

[0032] The first mounting step 21 comprises, from bottom to top, a first ring 211, a second ring 212, and a third ring 213 along the axial direction of the housing 2. The inner walls of both the first ring 211 and the third ring 213 are parallel to the axial direction of the exhaust channel 10, and the inner diameter of the first ring 211 is smaller than the inner diameter of the third ring 213. That is, the inner diameters of the cross-sections of the first ring 211 and the third ring 213 are the same at any position. The inner wall of the second ring 212 is trumpet-shaped, and its two ends are respectively connected to the inner walls of the first ring 211 and the third ring 213. Thus, this structural design creates a groove structure on the inner circumference of the first mounting step 21.

[0033] The top cone 3 is fixed to the top of the housing 2 and housed within the exhaust channel 10.

[0034] The gasket 4 is annular, and the outer peripheral shape of the gasket 4 matches the inner peripheral shape of the first mounting step 21 and is engaged with the first mounting step 21. When the gasket 4 is pushed into the first mounting step 21 to form a snap-fit, the gasket 4 and the second mounting step 22 together form a mounting groove 20.

[0035] The elastic ring 5 is fixedly housed within the mounting groove 20. Specifically, in this embodiment, the elastic ring is a silicone ring.

[0036] In the above structural design, the bottom of the housing 2 is recessed upwards to form a first mounting step and a second mounting step in sequence. The inner wall of the first mounting step is designed to form a slot structure, eliminating the need to integrally injection mold the gasket 4 with the housing. During assembly, the elastic ring 5 and the gasket 4 can be clamped and sequentially pushed onto the second mounting step 22 and the first mounting step 21, respectively. The outer periphery of the gasket 4 matches the inner periphery of the first mounting step 21, thereby locking and fixing it onto the first mounting step 21. At the same time, the elastic ring 5 is simultaneously limited to the first mounting step 21, realizing the installation of the elastic ring 5 and the gasket 4. Moreover, since the gasket 4 is not integrally molded with the housing, nor is it an inverted snap-fit ​​structure, the installation of the gasket 4 and the elastic ring 5 can be completed through automated assembly. Simply clamping and applying force to push can complete the process, effectively improving production efficiency.

[0037] In this embodiment, the outer peripheral shape of the gasket 4 matches the inner peripheral shape of the first mounting step 21. Specifically, the outer peripheral side of the gasket 4 includes, from bottom to top, a first annular wall 41, a second annular wall 42, and a third annular wall 43 along its axial direction. The outer diameter of the first annular wall 41 is smaller than the outer diameter of the third annular wall 43. The two ends of the second annular wall 42 are respectively connected to the first annular wall 41 and the third annular wall 43, that is, the outer peripheral side of the second annular wall 42 is trumpet-shaped. When the gasket 4 is engaged with the first mounting step 21, the first annular wall 41 abuts against the inner wall of the first annular body 211, the second annular wall 42 abuts against the inner wall of the second annular body 212, and the third annular wall 43 abuts against the inner wall of the third annular body 213.

[0038] More preferably, the third annular wall 43 of the gasket 4 forms a first chamfer structure 44 at the end away from the second annular wall 42. The first chamfer structure 44 allows the gasket 4 to make room around the top of the first mounting step 21 when it is pushed against the first mounting step 21, without interfering with the inlet of the first mounting step 21. This makes it easier to align and enter the first mounting step 21, further improving installation efficiency.

[0039] In this embodiment, the inner diameter of the second mounting step 22 is smaller than the inner diameter of the first mounting step 21, and a second chamfer structure 221 is formed at the end of the second mounting step 22 closest to the first mounting step 21. The second chamfer structure 221 is set in the same principle as the first chamfer structure 44, but the second chamfer structure 221 is to make way for the elastic ring 5 when it is pushed into the second mounting step 22, so that the elastic ring 5 can be easily aligned and entered into the second mounting step 22, thereby further improving the installation efficiency.

[0040] In this embodiment, the housing 2 and the valve body 1 are integrally injection molded.

[0041] Specifically, the housing 2 includes an inner shell 23 and an outer shell 24.

[0042] The inner shell 23 includes a first section 231 that fits against the inner periphery of the valve body 1 and forms the exhaust channel 10, a second section 232 that extends in an annular shape from the bottom end of the first section 231 along the bottom wall of the valve body 1, and a third section 233 that extends in an annular shape from the end of the second section 232 that protrudes downward away from the first section 231.

[0043] The outer casing 24 includes a body 241 covering the top of the valve body 1, an annular inner extending wall 242 and an annular outer extending wall 243 extending downward from the body 241, a bottom extending wall 244 extending from the end of the outer extending wall 243 away from the body 241 along the bottom of the third segment 233, and a retaining wall 245 extending from the bottom extending wall 244 along the inner sidewall of the third segment 233 and abutting against the bottom of the second segment 232. The inner extending wall 242 extends and conforms to the inner sidewall of the first segment 231, and the outer extending wall 243 extends and conforms to the outer sidewall of the valve body 1. The first mounting step 21 is formed by a recess in the inner side of the retaining wall 245. The retaining wall 245 abuts against the inner sidewall of the third segment 233 and forms the second mounting step 22.

[0044] During production, the inner shell 23 and the valve body 1 can be injection molded together for the first time, and then the outer shell 24, the inner shell 23, and the valve body 1 can be injection molded together for the second time.

[0045] The inner circumferential side of the inner extension wall 242 is provided with a slot 2411 that communicates with the exhaust channel 10. A top cone sleeve 2412 is installed in the slot 2411. The top cone sleeve 2412 is fitted and fixed to the top cone 3 and fixes the top cone 3 into the slot 2411.

[0046] Compared with the prior art, the pressure relief and pressure limiting valve of this utility model has a first mounting step and a second mounting step that are concave upward at the bottom of the housing and are arranged in an annular shape and coaxially. The first mounting step includes a first ring body, a second ring body and a third ring body in sequence from bottom to top along the axial direction of the housing. The inner sidewalls of the first ring body and the third ring body are parallel to the axial direction of the exhaust channel, and the inner diameter of the first ring body is smaller than the inner diameter of the third ring body. The inner sidewall of the second ring body is trumpet-shaped, and its two ends are respectively connected to the inner sidewalls of the first ring body and the inner sidewalls of the third ring body, thereby forming a locking engagement. At the same time, the outer peripheral shape of the gasket matches the inner peripheral shape of the first mounting step and is locked in the first mounting step. The gasket and the second mounting step together form a mounting groove for fixing and accommodating the elastic ring. Through the above structural design, the gasket is improved to a non-inverted structure, and the gasket and the shell are not integrally injection molded, but are separately pressed and snapped together. During assembly, the elastic ring and the gasket can be aligned and clamped at the same time and pressed into the mounting groove and the first mounting step simultaneously, which can achieve fully mechanized and automatic installation and greatly improve production and assembly efficiency.

[0047] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A pressure relief and pressure limiting valve, characterized in that, include: Valve body, the valve body being annular; A housing that completely encloses the valve body and forms an exhaust passage on the inner side of the valve body; The bottom of the housing is recessed upward to form a first mounting step and a second mounting step that are annular and coaxially arranged. Both the first mounting step and the second mounting step are connected to the exhaust channel. The first mounting step includes a first ring, a second ring and a third ring in sequence from bottom to top along the axial direction of the housing. The inner sidewalls of the first ring and the third ring are parallel to the axial direction of the exhaust channel. The inner diameter of the first ring is smaller than the inner diameter of the third ring. The inner sidewall of the second ring is trumpet-shaped and its two ends are respectively connected to the inner sidewalls of the first ring and the third ring. A top cone, which is fixed to the top of the housing and housed within the exhaust channel; A gasket, the gasket being annular, the outer peripheral shape of the gasket matching the inner peripheral shape of the first mounting step and being engaged with the first mounting step, the gasket and the second mounting step together forming a mounting groove; and... An elastic ring is fixedly housed within the mounting groove.

2. The pressure relief and pressure limiting valve according to claim 1, characterized in that, The outer periphery of the gasket includes, from bottom to top, a first ring wall, a second ring wall, and a third ring wall along its axial direction. The outer diameter of the first ring wall is smaller than the outer diameter of the third ring wall. The two ends of the second ring wall are respectively connected to the first ring wall and the third ring wall. When the gasket is engaged with the first mounting step, the first ring wall abuts against the inner wall of the first ring body, the second ring wall abuts against the inner wall of the second ring body, and the third ring wall abuts against the inner wall of the third ring body.

3. The pressure relief and limiting valve according to claim 2, characterized in that, The third annular wall of the gasket forms a first chamfer structure at the end away from the second annular wall.

4. The pressure relief and limiting valve according to claim 1, characterized in that, The inner diameter of the second mounting step is smaller than that of the first mounting step, and the end of the second mounting step near the first mounting step forms a second chamfer structure.

5. The pressure relief and limiting valve according to claim 1, characterized in that, The elastic ring is a silicone ring.

6. The pressure relief and pressure limiting valve according to claim 1, characterized in that, The housing includes an inner shell and an outer shell. The inner shell includes a first section that fits against the inner circumference of the valve body and forms the exhaust channel, a second section that extends in an annular shape from the bottom end of the first section along the bottom wall of the valve body, and a third section that extends in an annular shape from the end of the second section away from the first section. The outer shell includes a body that covers the top of the valve body, an inner extension wall and an outer extension wall that extend downward from the body, a bottom extension wall that extends from the end of the outer extension wall away from the body along the bottom of the third section, and a edging wall that extends from the bottom extension wall along the inner side wall of the third section and abuts against the bottom of the second section. The inner extension wall fits against the inner side wall of the first section, and the outer extension wall fits against the outer side wall of the valve body. The first mounting step is formed by the inner recess of the edging wall, and the edging wall abuts against the inner side wall of the third section and together forms the second mounting step.

7. The pressure relief and pressure limiting valve according to claim 6, characterized in that, The inner circumferential side of the inner extension wall is provided with a slot that communicates with the exhaust channel. A top cone sleeve is installed in the slot. The top cone sleeve is fitted and fixed to the top cone and fixes the top cone into the slot.

8. The pressure relief and pressure limiting valve according to claim 6, characterized in that, The housing and the valve body are integrally injection molded.

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