Pressure limiting valve

Abstract

The utility model provides a pressure-limiting valve which comprises a shell, a pressure-limiting valve core, a pressure-limiting valve core, a pressure-limiting valve core, a pressure-limiting valve core and a pressure-limiting valve core, the valve body is completely embedded into the shell and surrounds the exhaust channel; the base is made of a plastic material and comprises a first section fixed to the top end of the shell in a covering mode, a second section extending downwards into the exhaust channel from the first section and an exhaust hole penetrating through the first section; the cross section of the first section is larger than that of the second section, the second section and the inner circumferential side of the shell are arranged at intervals and jointly define an air guide channel, and the exhaust hole communicates the exhaust channel with the outside through the air guide channel. The base and the shell are of an integrally-formed structure. The sealing ball is located in the exhaust channel and fixed to the end, away from the first section, of the second section. And the elastic ring is fixedly mounted at the bottom of the inner peripheral side of the shell. Compared with the prior art, the pressure limiting valve is high in production efficiency and low in production cost.

Description

Technical Field

[0001] The utility model relates to the technical field of kitchenware accessories, in particular to a pressure limiting valve used in pressure containers such as electric pressure cookers and used for adjusting the pressure in the container. Background Art

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

[0003] The pressure limiting valve in the related technology includes an annular valve body, a shell that wraps the valve body and forms an exhaust channel, a base made of metal material that is fixed to the top end of the shell and extends into the exhaust channel, and a sealing ball that is fixed to the bottom of the base and is completely located in the exhaust channel; the base is provided with an exhaust hole that passes through it and connects the exhaust channel with the outside world.

[0004] However, in the pressure limiting valve of the related art, the sealing ball is usually fixed on a metal base, and then the base and the sealing ball are injection molded onto the plastic shell. Because the materials of the base and the shell are different, secondary injection molding is required, which not only reduces production efficiency, but also increases production costs due to the metal base.

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

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

[0007] In order to solve the above technical problems, the utility model provides a pressure limiting valve, comprising:

[0008] A housing, the housing being made of a plastic material, being cylindrical and having an exhaust passage extending therethrough along its axial direction;

[0009] a valve body, the valve body being completely embedded in the housing and arranged around the exhaust passage;

[0010] A base, the base being made of a plastic material, comprising a first section fixedly mounted on the top of the shell, a second section extending downward from the first section into the exhaust passage, and an exhaust hole extending through the first section; the first section having a larger cross-section than the second section; the second section being spaced apart from the inner circumference of the shell and jointly forming an air guide passage; the exhaust hole connecting the exhaust passage with the outside world via the air guide passage; the base and the shell being an integrally formed structure;

[0011] a sealing ball located in the exhaust passage and fixed to an end of the second section away from the first section; and

[0012] An elastic ring is fixedly mounted on the bottom of the inner circumference of the shell.

[0013] Preferably, the exhaust passage is cylindrical, the first section is a cylindrical structure, the second section is a truncated cone structure, and the cross section of the second section gradually decreases from one end close to the first section to the other end.

[0014] Preferably, the valve body is annular, and the shell includes an inner shell fixed to the inner circumference of the valve body and an outer shell fixed to the outer circumference of the valve body, the top of the inner shell is fixedly connected to the top of the outer shell and forms a seal, the bottom end of the inner shell is fixedly connected to the bottom end of the outer shell and forms a seal, the exhaust channel is set through the inner shell; the base and the outer shell are formed as one piece.

[0015] Preferably, the base also includes a ring-shaped clamping arm formed by the second section protruding downward from one end of the first section, the inner circumference of the clamping arm is an outwardly concave arc, and the sealing ball is clamped in the clamping arm and located on the axis of the exhaust channel.

[0016] Preferably, the pressure-limiting valve further includes an annular gasket, which is fixed to the bottom end of the shell. An annular fixing groove is provided on the inner periphery of the gasket, and the elastic ring is installed in the fixing groove.

[0017] Preferably, the elastic ring is a silicone ring.

[0018] Compared to the prior art, in the pressure-limiting valve of the present invention, both the base and the shell are made of plastic material, and the base and the shell are an integrally molded structure. The base includes a first section fixed to the top of the shell, a second section extending downward from the first section into the exhaust channel, and an exhaust hole penetrating the first section. The cross-section of the first section is larger than the cross-section of the second section. The second section is spaced apart from the inner circumference of the shell and together form an air guide channel. The exhaust hole connects the exhaust channel to the outside world through the air guide channel, and the sealing ball is fixed to the bottom of the second section of the base. Thus, the metal structure of the base is eliminated, so that the base and shell only need to be molded once, avoiding the secondary molding process and improving production efficiency. Moreover, due to the reduction of metal structure, the overall production cost is further reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The following describes the present invention 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 made with reference to the following drawings.

[0020] In the picture:

[0021] Figure 1 This is a schematic structural diagram of the pressure limiting valve of the utility model;

[0022] Figure 2 This is a structural diagram of the pressure limiting valve of the utility model without the sealing ball. DETAILED DESCRIPTION

[0023] The specific implementation of the present utility model is described in detail below with reference to the accompanying drawings.

[0024] The specific embodiments / examples described herein are specific embodiments of the present invention and are used to illustrate the concept of the present invention. They are illustrative and exemplary and should not be construed as limiting the embodiments and scope of the present invention. In addition to the examples described herein, those skilled in the art can also adopt other obvious technical solutions based on the claims and the disclosure of the specification. These technical solutions, including any obvious replacements and modifications of the embodiments described herein, are all within the scope of protection of the present invention.

[0025] The following descriptions of the various embodiments refer to the accompanying drawings to illustrate specific embodiments in which the present invention may be implemented. Directional terms used in this invention, such as up, down, front, back, left, right, inside, outside, and side, refer only to the directions in the accompanying drawings. Therefore, these directional terms are intended to illustrate and facilitate understanding of the present invention and are not intended to limit the present invention.

[0026] Please refer to Figure 1-2 As shown, the utility model provides a pressure limiting valve 100 , comprising: a housing 1 , a valve body 2 , a base 3 , a sealing ball 4 , and an elastic ring 5 .

[0027] The housing 1 is made of plastic material. The housing 1 is cylindrical and has an exhaust passage 10 extending therethrough along its axial direction.

[0028] The valve body 2 is completely embedded in the housing 1 and is disposed around the exhaust passage 10. The valve body also serves as a counterweight to maintain the weight of the pressure limiting valve 100.

[0029] In this embodiment, specifically, the valve body 2 is annular, and the housing 1 includes an inner housing 11 that is fixedly attached to the inner circumference of the valve body 2, and an outer housing 12 that is fixedly attached to the outer circumference of the valve body 2. The top end of the inner housing 11 is fixedly connected to the top end of the outer housing 12 to form a seal, and the bottom end of the inner housing 11 is fixedly connected to the bottom end of the outer housing 12 to form a seal, thereby completely enclosing the valve body 2 within the housing 1. The exhaust passage 10 is provided through the inner housing 11.

[0030] The base 3 is made of plastic material and includes a first section 31 fixed to the top of the housing 1 , a second section 32 extending downward from the first section 31 into the exhaust channel 10 , and an exhaust hole 33 passing through the first section 31 .

[0031] In this embodiment, the cross-section of the first section 31 is larger than the cross-section of the second section 32, so that the first section 31 support cover is arranged at the top of the shell 1, and the second section 32 can extend into the exhaust channel 10. The second section 32 is spaced apart from the inner circumference of the shell 1 and together form an air guide channel 20. The exhaust hole 33 connects the exhaust channel 10 with the outside world through the air guide channel 20. The base 3 and the shell 1 are both made of plastic material, and the two are an integrally molded structure and are molded in one step. Compared with the base 3 being a hardware part and requiring secondary injection molding when it is injection molded with the shell, the production efficiency is effectively improved. At the same time, when the metal base structure is omitted, the metal structure of the pressure limiting valve 100 is effectively simplified, thereby reducing the production cost.

[0032] Specifically, in this embodiment, the base 3 and the outer shell 1 are integrally formed, and two ends of the inner shell 11 are respectively connected and sealed to two ends of the outer shell 12 to fix the two.

[0033] The sealing ball 4 is located in the exhaust passage 10 and fixed to an end of the second section 32 away from the first section 31 .

[0034] The elastic ring 5 is fixedly mounted on the bottom of the inner circumference of the housing 1. In this embodiment, the elastic ring 5 is a silicone ring.

[0035] When used in conjunction with the exhaust rod on the pressure cooker lid, the pressure-limiting valve 100 is mounted on the top of the exhaust rod, which is then abutted against the sealing ball 4 to seal the pressure inside the pressure cooker. When the pressure inside the cooker becomes excessive, gas ejected through the exhaust rod pushes open the sealing ball 4, causing the pressure-limiting valve 100 to rise as a whole. The gas then enters the exhaust passage 10 and flows through the air guide passage 20 to the exhaust hole 33 and is discharged to the outside world. At this point, the pressure inside the pressure cooker is reduced to a safe range due to the exhaust, i.e., to a level that no longer pushes the sealing ball 4 upward. This process is repeated to regulate the pressure inside the cooker.

[0036] In this embodiment, preferably, the exhaust passage 10 is cylindrical, the first section 31 is cylindrical, and the second section 32 is a truncated cone. The cross-section of the second section 32 gradually decreases from one end closest to the first section 31 toward the other end. This structure allows the first section 31 to be better supported on the top and bottom of the housing 1, while also making it easier for the second section 32 to be inserted into the exhaust passage 10 and to form the air guide passage 20 with the inner circumference of the housing 1, i.e., the inner circumference of the inner shell 11.

[0037] To better secure the sealing ball 4, in this embodiment, the base 3 further includes an annular clamping arm 34, formed by a downwardly projecting end of the second section 32 away from the first section 31. The inner circumference of the clamping arm 34 is in an outwardly concave arc shape, forming a bottom-open circular cavity 30 within the inner circumference of the clamping arm 34. The sealing ball is retained within the clamping arm 34, that is, installed into the circular cavity 30 through the bottom opening of the clamping arm 34. The clamping arm 34 is located on the axis of the exhaust passage 10, facilitating that the sealing ball 4 abuts against the exhaust rod port, sealing it, when assembled to the exhaust rod.

[0038] In this embodiment, the pressure-limiting valve 100 further includes an annular gasket 6 fixed to the bottom end of the housing 12. The inner circumference of the gasket 6 is provided with an annular fixing groove 61. The elastic ring 5 is installed in the fixing groove 61, thereby being fixed to the bottom of the housing 1 via the gasket 6. When the exhaust rod is inserted into the exhaust passage 10, the elastic ring 5 is sleeved onto the exhaust rod and forms a sealed connection with the exhaust rod. At this time, the elastic ring 5 is positioned on the exhaust rod, that is, the pressure-limiting valve 100 is relatively limited to the exhaust rod and does not move out of the exhaust rod during exhaust, thus providing a release function. The elastic ring 5's own elastic force allows the pressure-limiting valve 100 to be slightly upward relative to the exhaust rod during exhaust, thereby achieving exhaust. Therefore, the inner diameter of the elastic ring 5 is slightly smaller than the outer diameter of the exhaust rod and smaller than the inner diameter of the exhaust passage 10.

[0039] Compared to the prior art, in the pressure-limiting valve of the present invention, both the base and the shell are made of plastic material, and the base and the shell are an integrally molded structure. The base includes a first section fixed to the top of the shell, a second section extending downward from the first section into the exhaust channel, and an exhaust hole penetrating the first section. The cross-section of the first section is larger than the cross-section of the second section. The second section is spaced apart from the inner circumference of the shell and together form an air guide channel. The exhaust hole connects the exhaust channel to the outside world through the air guide channel, and the sealing ball is fixed to the bottom of the second section of the base. Thus, the metal structure of the base is eliminated, so that the base and shell only need to be molded once, avoiding the secondary molding process and improving production efficiency. Moreover, due to the reduction of metal structure, the overall production cost is further reduced.

[0040] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A pressure limiting valve, characterized in that: include: A housing, the housing being made of a plastic material, being cylindrical and having an exhaust passage extending therethrough along its axial direction; a valve body, the valve body being completely embedded in the housing and arranged around the exhaust passage; A base, the base being made of a plastic material, comprising a first section fixedly mounted on the top of the shell, a second section extending downward from the first section into the exhaust passage, and an exhaust hole extending through the first section; the first section having a larger cross-section than the second section; the second section being spaced apart from the inner circumference of the shell and jointly forming an air guide passage; the exhaust hole connecting the exhaust passage with the outside world via the air guide passage; the base and the shell being an integrally formed structure; a sealing ball located in the exhaust passage and fixed to an end of the second section away from the first section; and An elastic ring is fixedly mounted on the bottom of the inner circumference of the shell.

2. The pressure limiting valve according to claim 1, characterized in that The exhaust passage is cylindrical, the first section is a cylindrical structure, the second section is a truncated cone structure, and the cross section of the second section gradually decreases from one end close to the first section to the other end.

3. The pressure limiting valve according to claim 1, characterized in that The valve body is annular, and the shell includes an inner shell fixed to the inner circumference of the valve body and an outer shell fixed to the outer circumference of the valve body. The top end of the inner shell is fixedly connected to the top end of the outer shell to form a seal, and the bottom end of the inner shell is fixedly connected to the bottom end of the outer shell to form a seal. The exhaust channel is arranged through the inner shell; the base and the outer shell are formed as one piece.

4. The pressure limiting valve according to claim 2, characterized in that: The base also includes a ring-shaped clamping arm formed by the second section protruding downward from one end of the first section, the inner circumference of the clamping arm is an outwardly concave arc, and the sealing ball is clamped in the clamping arm and located on the axis of the exhaust channel.

5. The pressure limiting valve according to claim 3, characterized in that: The pressure limiting valve further comprises an annular gasket, which is fixed to the bottom end of the shell. An annular fixing groove is provided on the inner periphery of the gasket, and the elastic ring is installed in the fixing groove.

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

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