Pressure release valve for pressure cooker

Abstract

The utility model provides a pressure release valve for a pressure cooker, and belongs to the technical field of cooker accessories. The problem that safety is insufficient during exhaust is solved. The pressure release valve for the pressure cooker comprises a body and a rod-shaped valve element vertically arranged in the body in a penetrating mode, a pressure bearing cavity and a pressure release cavity are formed in the body from bottom to top, the valve element moves in the axial direction to control the pressure bearing cavity and the pressure release cavity to be communicated or separated, an exhaust hole communicated with the pressure release cavity is formed in the side portion of the body, and the upper end of the valve element extends out of the body. A protective cover is fixedly connected to the upper end of the valve element and covers the upper end of the body, an exhaust gap is formed between the outer wall of the body and the inner wall of the protective cover, and the exhaust gap is communicated with the exhaust hole. The device has the advantages of higher safety and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of cooking utensil accessories and relates to a pressure relief valve for a pressure cooker. Background Art

[0002] The pressure relief valve is installed on the lid of the pressure cooker and is mainly used to relieve pressure when the pressure value in the pot exceeds the safety value. For example, an improved pressure relief valve for a pressure cooker disclosed in Patent Application No. 201010567748.1 includes a valve body and a valve cover connected together by threads. The valve body has an air inlet hole communicating with the inside of the pot, the valve cover has an exhaust hole, a sealing member made of an elastic material is fixedly provided between the valve cover and the valve body, a through hole is opened in the middle of the sealing member, a valve core capable of closing the through hole is provided on the sealing member, the valve core is rod-shaped, one end of the valve core extends out of the valve cover, the other end of the valve core has a stress part with an outer diameter larger than that of the through hole, the stress part passes through the through hole, a spring is arranged in the valve body, one end of the spring abuts against a boss arranged on the inner wall of the valve body, and the other end abuts against the stress part. Under the action of the spring, the stress part can abut against the sealing member to close the through hole of the sealing member. After the valve core closes the through hole, the pressure relief valve is divided into a pressure-bearing cavity communicating with the air inlet hole and a pressure relief cavity communicating with the exhaust hole, and when the pressure in the pressure-bearing cavity is too high, the valve core can be separated from the sealing member to communicate the pressure-bearing cavity with the pressure relief cavity. The outer diameter of the stress part is larger than the through hole of the sealing member. Therefore, after the valve core passes through the sealing member, under the action of the spring, the back surface of the stress part can always abut against the sealing member to close the through hole and prevent the pressure cooker from leaking air; when the pressure in the pot exceeds the safety value, the sealing member deforms, the stress part moves up with the sealing member until the through hole of the sealing member deforms to make the stress part separate from the through hole, and then the pressure cooker starts to relieve pressure. During the pressure relief process, the valve core is always located at the upper end of the sealing member, that is, in the pressure relief cavity, to ensure that the valve core will not close the through hole during the pressure relief process of the pressure relief valve. When the pressure relief is completed, it is necessary to manually press the valve core to make the stress part pass through the through hole on the sealing member and close the through hole again.

[0003] Combined with its specification drawings, it can be seen that the exhaust hole is arranged radially. When exhausting, the high-pressure steam in the pot will be ejected straight out after passing through the exhaust hole. Since the temperature of the ejected high-pressure steam is relatively high, if the exhaust hole happens to be facing the user, the high-pressure steam will directly spray towards the user, posing a risk of harm to the user. Summary of the Utility Model

[0004] The purpose of the present utility model is to address the above problems existing in the prior art and propose a pressure relief valve for a pressure cooker, which solves the problem of insufficient safety during exhaust.

[0005] The purpose of the present utility model can be achieved by the following technical solutions:

[0006] A pressure relief valve for a pressure cooker, comprising a body and a valve core vertically penetrating the body in a rod shape. The body has a pressure-bearing cavity and a pressure relief cavity from bottom to top. The axial movement of the valve core can control the communication or isolation between the pressure-bearing cavity and the pressure relief cavity. The side of the body has an exhaust hole communicating with the pressure relief cavity. The upper end of the valve core extends out of the body. It is characterized in that a protective cover is fixedly connected to the upper end of the valve core. The protective cover covers the outside of the upper end of the body. An exhaust gap is formed between the outer wall of the body and the inner wall of the protective cover, and the exhaust gap communicates with the exhaust hole.

[0007] Similar to the existing ones, when the pressure in the pot exceeds the set value, the valve core will move upward and control the communication between the pressure-bearing cavity and the pressure relief cavity. In this way, the high-pressure steam in the pot will enter the pressure relief cavity from the pressure-bearing cavity and then be discharged outward through the exhaust hole for pressure relief. This pressure relief valve has a protective cover fixedly connected to the upper end of the valve core. The protective cover covers the outside of the upper end of the body. An exhaust gap communicating with the exhaust hole is formed between the outer wall of the body and the inner wall of the protective cover. This makes the high-pressure steam discharged from the exhaust hole blocked by the protective cover and unable to spray directly at the user, but can only be discharged downward through the exhaust gap, eliminating the hidden danger of causing harm to the user, thereby improving the safety during exhaust.

[0008] In the above-mentioned pressure relief valve for a pressure cooker, the protective cover is in a cylindrical shape with an open lower end. A cylindrical connecting portion is provided in the central area of the inner top wall of the protective cover. The connecting portion has a connecting hole, and the upper end of the valve core is fixedly connected in the connecting hole.

[0009] The protective cover is in a cylindrical shape with an open lower end, that is, the protective cover has a top. Such a shape not only ensures that the high-pressure steam will not spray directly at the user, but also enables the protective cover to act as a handle-like function to make it more convenient for the user to operate the valve core.

[0010] In the above-mentioned pressure relief valve for a pressure cooker, the top of the protective cover has a downwardly recessed groove, and an inlay block is embedded in the groove.

[0011] Generally speaking, the pressure relief valve is produced by the manufacturer separately and then sold to different cookware manufacturers. By providing a groove on the top of the protective cover and embedding an inlay block in the groove, the nameplate label can be directly printed on the top surface of the inlay block instead of on the protective cover. Therefore, when selling to different cookware manufacturers, only the inlay block printed with the logo nameplate of the cookware manufacturer needs to be replaced, and there is no need to replace the entire protective cover.

[0012] In the above-mentioned pressure relief valve for pressure cooker, a sealing gasket is fixed in the body, the pressure-bearing chamber and the pressure relief chamber are connected through the center hole of the sealing gasket, the valve core passes through the sealing gasket, the lower end of the valve core has a force-bearing part, the upper end of the force-bearing part abuts against the lower end hole of the center hole of the sealing gasket, a supporting spring is arranged in the pressure-bearing chamber, the upper end of the supporting spring abuts against the lower end of the force-bearing part, the bottom of the body has an air inlet hole connected with the pressure-bearing chamber, the outer side of the lower end of the force-bearing part has a guide cone surface 1, the outer diameter of the guide cone surface 1 gradually decreases from top to bottom, the maximum outer diameter of the guide cone surface 1 is smaller than the aperture of the air inlet hole, the lower end of the force-bearing part is close to the air inlet hole, and when the valve core separates the pressure-bearing chamber from the pressure relief chamber, the distance between the lower end surface of the connecting part and the upper end of the body is greater than the maximum distance that the valve core can move downward to overcome the action of the supporting spring.

[0013] Under normal conditions, the elastic force of the support spring acts on the valve core, so that the upper end of the force-bearing part of the valve core abuts against the lower end opening of the center hole of the sealing gasket to separate the pressure-bearing chamber from the pressure-relieving chamber. When the pressure in the pot exceeds the set value, the inner edge of the sealing gasket deforms upward under the action of pressure, and similarly, the center hole of the sealing gasket also deforms upward, thereby allowing the valve core to move upward and allow the force-bearing part to pass through the center hole of the sealing gasket.

[0014] The air inlet is used for high-pressure steam to enter the body. After long-term use, scale may accumulate in the air inlet to form impurities. The pressure relief valve sets the lower end of the force-bearing part to be close to the air inlet under normal conditions. The maximum outer diameter of the guide cone surface one on the outer side of the lower end of the force-bearing part is smaller than the aperture of the air inlet, and the distance between the lower end surface of the connecting part and the upper end of the body under normal conditions is greater than the maximum distance that the valve core can move downward to overcome the support spring. This means that if the user presses the valve core downward, the force-bearing part at the lower end of the valve core can directly pass through the air inlet and poke out the impurities accumulated in the air inlet, thus realizing the unblocking function of the air inlet and ensuring the reliability of exhaust.

[0015] In the pressure relief valve for the pressure cooker, the outer side of the upper end of the force-bearing part has a second guide cone surface, and the outer diameter of the second guide cone surface gradually increases from top to bottom.

[0016] When the pressure in the pot exceeds a set value, the second guide cone surface can guide the force-bearing part, so that the force-bearing part can more easily pass through the center hole of the sealing gasket upwards.

[0017] In the above-mentioned pressure relief valve for pressure cookers, the main body includes an upper connector and a lower connector, the lower end of the upper connector is threadedly connected to the upper end of the lower connector, the inner side of the upper end of the lower connector is provided with an annular positioning seat, the lower outer edge of the sealing gasket abuts on the annular positioning seat, the outer edge of the upper side surface of the sealing gasket protrudes upward and is provided with a flange, and the lower end of the upper connector abuts on the flange.

[0018] The setting of the flange means that the outer edge thickness of the sealing gasket is greater than the inner edge thickness of the sealing gasket, so that the sealing gasket can be more easily deformed under the action of pressure exceeding the set value.

[0019] Compared with the prior art, the pressure relief valve used in this pressure cooker has the following advantages:

[0020] 1. A protective cover is fixedly connected to the upper end of the valve core. The protective cover covers the outside of the upper end of the body, and an exhaust gap communicating with the exhaust hole is formed between the outer wall of the body and the inner wall of the protective cover. This makes the high-pressure steam discharged from the exhaust hole blocked by the protective cover and unable to spray directly towards the user, but can only be discharged downward through the exhaust gap, eliminating the potential hazard of causing harm to the user, thereby improving the safety during exhaust.

[0021] 2. The lower end of the force-bearing part is set to be close to the air inlet hole under normal conditions. The maximum outer diameter of the first guiding conical surface on the outer side of the lower end of the force-bearing part is smaller than the aperture of the air inlet hole, and the distance between the lower end surface of the connecting part and the upper end part of the body is greater than the maximum distance that the valve core can move downward against the action of the support spring under normal conditions, so that the user can directly push down the valve core to remove the impurities accumulated in the air inlet hole, realizing the dredging function of the air inlet hole and ensuring the reliability of exhaust. Description of the Drawings

[0022] Figure 1 is a cross-sectional view of the pressure relief valve used in this pressure cooker under normal conditions.

[0023] Figure 2 is a three-dimensional schematic diagram of the pressure relief valve used in this pressure cooker after removing the protective cover.

[0024] Figure 3 is a three-dimensional schematic diagram of the protective cover.

[0025] Figure 4 is a cross-sectional view of the pressure relief valve used in this pressure cooker in the exhaust pressure relief state.

[0026] Figure 5 is a cross-sectional view of the pressure relief valve used in this pressure cooker when dredging the air inlet hole.

[0027] In the figure, 1. Body; 1a. Pressure-bearing cavity; 1b. Pressure relief cavity; 1c. Exhaust hole; 1d. Air inlet hole; 1e. Upper connecting body; 1f. Lower connecting body; 1f1. Annular positioning seat; 1f2. Clamping plane; 2. Valve core; 2a. Force-bearing part; 2a1. First guiding conical surface; 2a2. Second guiding conical surface; 3. Protective cover; 3a. Connecting part; 3a1. Connecting hole; 3b. Groove; 3c. Rib; 4. Exhaust gap; 5. Insert block; 6. Sealing gasket; 6a. Flange; 7. Support spring. Detailed Embodiment

[0028] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0029] like Figure 1 , Figure 2 and Figure 3 As shown, a pressure relief valve for a pressure cooker includes a body 1 and a rod-shaped valve core 2 vertically inserted into the valve body. The body 1 has a pressure-bearing chamber 1a and a pressure-releasing chamber 1b from bottom to top. The valve core 2 can control the connection or isolation of the pressure-bearing chamber 1a and the pressure-releasing chamber 1b by moving axially. The bottom of the body 1 has an air inlet 1d connected to the pressure-releasing chamber 1b, and the side of the body 1 has an exhaust hole 1c connected to the pressure-releasing chamber 1b. There are a plurality of exhaust holes 1c, and each exhaust hole 1c is evenly arranged around the center line of the body 1. The upper end of the valve core 2 extends out of the body 1, and a protective cover 3 is fixedly connected to the upper end of the valve core 2. The protective cover 3 covers the upper end of the body 1. An exhaust gap 4 is formed between the outer wall of the body 1 and the inner wall of the protective cover 3, and the exhaust gap 4 is connected to the exhaust hole 1c. Specifically, the shield 3 is in the shape of a tube with an opening at the lower end, and a cylindrical connecting portion 3a is provided in the central area of ​​the inner top wall of the shield 3. The connecting portion 3a has a connecting hole 3a1, and the upper end of the valve core 2 is fixedly connected to the connecting hole 3a1. In practice, the upper end of the valve core 2 can be threadedly connected to the connecting portion 3a. The top of the shield 3 has a groove 3b that is concave downward, and an insert 5 is embedded in the groove 3b. A plurality of ribs 3c are fixedly connected between the outer peripheral wall of the connecting portion 3a and the inner wall of the shield 3.

[0030] Furthermore, if Figure 1 As shown, a sealing gasket 6 is fixed in the body 1, and the sealing gasket 6 is a silicone part. The pressure-bearing chamber 1a and the pressure-relief chamber 1b are located on both sides of the sealing gasket 6, and the pressure-bearing chamber 1a and the pressure-relief chamber 1b are connected through the center hole of the sealing gasket 6. The valve core 2 passes through the center hole of the sealing gasket 6, and the lower end of the valve core 2 has a force-bearing part 2a, and the upper end of the force-bearing part 2a abuts against the lower end of the center hole of the sealing gasket 6. A support spring 7 is provided in the pressure-bearing chamber 1a, and the upper end of the support spring 7 abuts against the lower end of the force-bearing part 2a, and the lower end of the support spring 7 abuts against the inner wall of the pressure-bearing chamber 1a. The support spring 7 is pagoda-shaped, and the upper end of the support spring 7 is a small end, and the lower end of the support spring 7 is a large end. The outer side of the lower end of the force-bearing part 2a has a guide cone 2a1, the outer diameter of which gradually decreases from top to bottom, and the maximum outer diameter of which is smaller than the aperture of the air inlet hole 1d. The lower end of the force-bearing part 2a is close to the air inlet hole 1d, and when the valve core 2 separates the pressure-bearing chamber 1a from the pressure-releasing chamber 1b, the distance between the lower end surface of the connecting part 3a and the upper end of the body 1 is greater than the maximum distance that the valve core 2 can move downward to overcome the action of the support spring 7. The outer side of the upper end of the force-bearing part 2a has a guide cone 2a2, and the outer diameter of which gradually increases from top to bottom.

[0031] In this embodiment, if Figure 1 and Figure 2 As shown, the body 1 includes an upper connector 1e and a lower connector 1f, the lower end of the upper connector 1e is threadedly connected to the upper end of the lower connector 1f, the inner side of the upper end of the lower connector 1f has an annular positioning seat 1f1, the lower outer edge of the sealing gasket 6 abuts on the annular positioning seat 1f1, the outer edge of the upper side of the sealing gasket 6 protrudes upward and is provided with a flange 6a, and the lower end of the upper connector 1e abuts on the flange 6a. The provision of the flange 6a means that the outer edge thickness of the sealing gasket 6 is greater than the inner edge thickness of the sealing gasket 6, so that the sealing gasket 6 can be deformed more easily under the pressure exceeding the set value. The outer diameter of the lower end of the upper connector 1e is smaller than other positions of the upper connector 1e, and the lower end side of the lower connector 1f is symmetrically provided with two clamping planes 1f2.

[0032] When in use, after the lower end of the upper connector 1e is passed through the installation hole of the pot cover, the upper end of the lower connector 1f is threadedly connected to the lower end of the upper connector 1e. In practice, a sealing ring can be provided on the outer cover of the lower end of the upper connector 1e. After the lower connector 1f is threadedly connected to the upper connector 1e, the sealing ring will abut against the pot cover to form a seal to prevent air leakage. Figure 1 As shown, the elastic force of the support spring 7 acts on the valve core 2, so that the upper end of the force-bearing portion 2a of the valve core 2 abuts against the lower end opening of the center hole of the sealing gasket 6 to separate the pressure-bearing chamber 1a from the pressure-relieving chamber 1b.

[0033] When the pressure in the pot exceeds the set value, the inner edge of the sealing gasket 6 is deformed upward under the action of pressure, and similarly, the center hole of the sealing gasket 6 is also deformed upward, thereby enabling the valve core 2 to move upward and allow the force-bearing portion 2a to pass through the center hole of the sealing gasket 6, so that the pressure-bearing chamber 1a and the pressure-releasing chamber 1b are connected, and the high-pressure steam in the pot will enter the pressure-releasing chamber 1b from the pressure-bearing chamber 1a, and then be discharged from each exhaust hole 1c (in the exhaust stage, the entire valve core 2 is located above the sealing gasket 6). Since the upper end of the valve core 2 is fixedly connected to the shield 3, the shield 3 covers the outside of the upper end of the body 1, and an exhaust gap 4 connected to the exhaust hole 1c is formed between the outer wall of the body 1 and the inner wall of the shield 3, which makes the high-pressure steam discharged from the exhaust hole 1c blocked by the shield 3 and cannot be sprayed directly toward the user, but can only be discharged downward through the exhaust gap 4 (the state of exhaust pressure relief is as shown in FIG. 1 ). Figure 4 As shown), the hidden danger of harm to the user is eliminated, thereby improving the safety during exhaust.

[0034] In addition, after long-term use, dirt may accumulate in the air inlet hole 1d to form impurities. The lower end of the force-receiving part 2a of this pressure relief valve is set to be close to the air inlet hole 1d under normal conditions. The maximum outer diameter of the guiding conical surface 1 of the outer side of the lower end of the force-receiving part 2a is smaller than the aperture of the air inlet hole 1d, and the distance between the lower end surface of the connecting part 3a and the upper end part of the main body 1 is greater than the maximum distance that the valve core 2 can move downward against the action of the support spring 7 under normal conditions. This means that if the user presses down on the valve core 2, the force-receiving part 2a at the lower end of the valve core 2 can directly penetrate into the air inlet hole 1d to poke out the impurities accumulated in the air inlet hole 1d (this state is as shown in Figure 5 ), that is, the dredging function of the air inlet hole 1d is realized, ensuring the reliability of exhaust.

[0035] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A pressure relief valve for a pressure cooker, comprising a body (1) and a rod-shaped valve core (2) vertically inserted into the body (1), wherein the body (1) has a pressure-bearing chamber (1a) and a pressure-releasing chamber (1b) from bottom to top, and the valve core (2) can control the connection or isolation of the pressure-bearing chamber (1a) and the pressure-releasing chamber (1b) by axial movement, and a vent hole (1c) connected to the pressure-releasing chamber (1b) is provided on the side of the body (1), and the upper end of the valve core (2) extends out of the body (1), characterized in that: The upper end of the valve core (2) is fixedly connected with a protective cover (3), which covers the upper end of the body (1), and an exhaust gap (4) is formed between the outer wall of the body (1) and the inner wall of the protective cover (3), and the exhaust gap (4) is connected to the exhaust hole (1c).

2. A pressure relief valve for a pressure cooker according to claim 1, characterized in that: The protective cover (3) is in the shape of a tube with an opening at the lower end. A cylindrical connecting portion (3a) is provided in the central area of ​​the inner top wall of the protective cover (3). The connecting portion (3a) has a connecting hole (3a1). The upper end of the valve core (2) is fixedly connected to the connecting hole (3a1).

3. A pressure relief valve for a pressure cooker according to claim 2, characterized in that: The top of the protective cover (3) is provided with a groove (3b) which is recessed downwards, and an insert (5) is embedded in the groove (3b).

4. A pressure relief valve for a pressure cooker according to claim 1, 2 or 3, characterized in that: A sealing gasket (6) is fixed inside the body (1), the pressure-bearing chamber (1a) and the pressure-releasing chamber (1b) are connected through the center hole of the sealing gasket (6), the valve core (2) passes through the sealing gasket (6), the lower end of the valve core (2) has a force-bearing portion (2a), the upper end of the force-bearing portion (2a) abuts against the lower end of the center hole of the sealing gasket (6), a support spring (7) is provided in the pressure-bearing chamber (1a), the upper end of the support spring (7) abuts against the lower end of the force-bearing portion (2a), and the bottom of the body (1) has an air inlet connected to the pressure-bearing chamber (1a). The force-bearing portion (2a) has a guide cone surface (2a1) on the outer side of the lower end, the outer diameter of the guide cone surface (2a1) gradually decreases from top to bottom, the maximum outer diameter of the guide cone surface (2a1) is smaller than the diameter of the air inlet hole (1d), the lower end of the force-bearing portion (2a) is close to the air inlet hole (1d), and when the valve core (2) separates the pressure-bearing chamber (1a) from the pressure-releasing chamber (1b), the distance between the lower end surface of the connecting portion (3a) and the upper end of the body (1) is greater than the maximum distance that the valve core (2) can move downward to overcome the action of the support spring (7).

5. A pressure relief valve for a pressure cooker according to claim 4, characterized in that: The outer side of the upper end of the force-bearing part (2a) is provided with a second guiding conical surface (2a2), and the outer diameter of the second guiding conical surface (2a2) gradually increases from top to bottom.

6. A pressure relief valve for a pressure cooker according to claim 4, characterized in that: The main body (1) comprises an upper connecting body (1e) and a lower connecting body (1f), wherein the lower end of the upper connecting body (1e) is threadedly connected to the upper end of the lower connecting body (1f), and the inner side of the upper end of the lower connecting body (1f) is provided with an annular positioning seat (1f1), the lower outer edge of the sealing gasket (6) abuts against the annular positioning seat (1f1), and the outer edge of the upper side surface of the sealing gasket (6) protrudes upward and is provided with a flange (6a), and the lower end of the upper connecting body (1e) abuts against the flange (6a).

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