Mechanical over-temperature and over-pressure dual safety relief switch device for sterilization kettle

Abstract

The utility model relates to the technical field of switch device, concretely relates to sterilization kettle mechanical type overtemperature overpressure duplex safety relief switch device, including a pair of safety valve and import switching valve and export switching valve of parallelly arranged, and the import pipe base of import switching valve is equipped with an import and two exports. The utility model can realize the accurate sealing adjustment or state feedback of valve clack through temperature perception, avoid the drawback in temperature corresponding control aspect, and fully consider the pressure balance and safety relief demand when in service maintenance, give consideration to the continuity and safety of system operation, solved the safety problem when in service maintenance.

Description

Technical Field

[0001] This utility model relates to the field of switch device technology, specifically to a mechanical over-temperature and over-pressure double-gang safety relief switch device for sterilization autoclaves. Background Technology

[0002] In existing sterilization autoclave over-temperature and over-pressure safety protection technologies, traditional double-spring full-opening or closed safety valves are usually composed of two spring-type safety valves connected in parallel on the same inlet Y-type pipe. Switching safety valves achieve switching control of the inlet section by adding a switching device to the double-spring safety valve, which facilitates the maintenance and replacement of the safety valve.

[0003] However, existing safety valve systems also have shortcomings in sealing reliability and temperature response control under harsh conditions such as high temperature and special media. It is difficult to achieve precise sealing adjustment or status feedback of the valve disc through temperature sensing. Furthermore, the traditional structure does not consider the pressure balance and safety relief requirements during in-service maintenance, and cannot take into account the safety of system operation.

[0004] Therefore, it is necessary to invent a mechanical over-temperature and over-pressure double-link safety relief switch device for sterilization autoclaves to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a mechanical over-temperature and over-pressure dual-stage safety relief switch for sterilization autoclaves. It achieves precise sealing adjustment or status feedback of the valve disc through temperature sensing, avoiding the drawbacks of temperature response control. It also fully considers the pressure balance and safety relief requirements during in-service maintenance, taking into account both the continuity and safety of system operation, and solving the safety problem during in-service maintenance.

[0006] To achieve the above objectives, this utility model provides the following technical solution: It includes a pair of safety valves, an inlet switching valve, and an outlet switching valve arranged in parallel. The inlet switching valve has one inlet and two outlets on its inlet pipe seat, and the outlet switching valve has one outlet and two inlets on its outlet pipe seat. The inlets of the safety valves are respectively connected to the two outlets of the inlet pipe seat, and the outlets of the safety valves are respectively connected to the two inlets of the outlet pipe seat. The outlet switching valve includes a pressure ring, a valve disc, and a valve stem. The valve disc is fixed to the end of the valve stem, and a groove is pre-reserved on the valve disc of the outlet switching valve, with a bimetallic strip disposed within the groove.

[0007] Preferably, the bimetallic strip consists of two different metal strips bonded together, with the metal strip having a higher coefficient of thermal expansion positioned on the side furthest from the valve seat.

[0008] Preferably, the bimetallic strip is interference-fitted with the groove.

[0009] Preferably, the bimetallic strips are manganese-nickel-copper and nickel-steel, respectively.

[0010] Preferably, a bimetallic strip sensor connection is used.

[0011] Preferably, the inlet of the safety valve is connected to the two outlets of the inlet seat via a Y-tube.

[0012] Preferably, a connecting pipe is provided between the two outlets of the inlet pipe seat and between the two inlets of the outlet pipe seat, and a balancing valve is provided on the corresponding two outlets and inlets of the connecting pipe.

[0013] Preferably, the connecting pipe between the two balance valves is connected to a vent pipe, and the vent pipe is equipped with a vent valve.

[0014] This utility model also provides a double safety relief switch device, including a pair of safety valves, an inlet switching valve, and an outlet switching valve arranged in parallel. The inlet pipe seat of the inlet switching valve has one inlet and two outlets, and the outlet pipe seat of the outlet switching valve has one outlet and two inlets. The inlets of the safety valves are respectively connected to the two outlets of the inlet pipe seat, and the outlets of the safety valves are respectively connected to the two inlets of the outlet pipe seat. An oblique through hole is provided between the inlet pipe seat of the inlet switching valve and the outlet pipe seat of the outlet switching valve.

[0015] Preferably, the oblique through hole is connected to the outlet end of the outlet switching valve outlet pipe seat through a pipe, and the pipe between the oblique through hole and the outlet pipe seat is inclined to the horizontal plane.

[0016] The technical effects and advantages provided by this utility model in the above technical solution are as follows: The valve stem connects the valve disc to the drive mechanism to control the position of the valve disc. The groove on the valve disc and the bimetallic strip are used to sense temperature. Specifically, the bimetallic strip is connected to the sensor (the bimetallic strip sandwiches the sensor in the middle, and the sensor is a pressure transmitter). The two metal strips deform differently after being heated. The sensor is connected to an external display screen, allowing the operator to monitor the temperature in real time. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0018] Figure 1 This is a perspective view of Embodiment 1 of the present utility model; Figure 2 This is a front view of Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the structure of the inlet switching valve in Embodiment 1 of this utility model; Figure 4 This utility model Figure 3 Enlarged view of point A in the middle; Figure 5 This is a perspective view of Embodiment 2 of the present invention; Figure 6 This is a top view of Embodiment 2 of the present invention; Explanation of reference numerals in the attached figures: 100, Safety valve; 200, Inlet switching valve; 300, Outlet switching valve; 201, Inlet pipe seat; 301, Outlet pipe seat; 220, Pressure ring; 230, Valve disc; 240, Valve stem; 250, Groove; 260, Bimetallic strip; 270, Sensor; 600, Connecting pipe; 601, Balancing valve; 602, Venting pipe; 603, Venting valve; 700, Inclined through hole; 800, Chain; 900, Pipeline. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0020] Example 1: This utility model provides the following... Figure 1-4 The mechanical over-temperature and over-pressure dual safety relief switch device for the sterilizer shown includes a pair of safety valves 100, an inlet switching valve 200, and an outlet switching valve 300 arranged in parallel. The pair of safety valves 100 serve as safety relief channels in case of over-pressure or over-temperature. When the pressure or temperature inside the sterilizer exceeds the set value, the safety valves 100 automatically open to release the pressure and ensure equipment safety. The function of setting a pair of safety valves 100 is that there are two independent safety valves 100 that can serve as backups for each other, improving system reliability and maintenance convenience.

[0021] The inlet switching valve 200 has one inlet and two outlets at its inlet seat 201, while the outlet switching valve 300 has one outlet and two inlets at its outlet seat 301. The inlet switching valve 200 controls the fluid (usually steam or other process media) to selectively enter one of the safety valves 100, thus achieving the switching function on the inlet side. For example, it can be selected that the medium only enters the first safety valve 100 or the second safety valve 100, facilitating individual maintenance or replacement of one of them.

[0022] The outlet switching valve 300 selectively directs the discharge medium from the safety valve 100 downstream (e.g., to a venting or recovery system), achieving a switching function on the outlet side. This also facilitates maintenance of either safety valve 100 without affecting the overall system operation. The pressure ring 220 is commonly used to fix or tighten the valve disc 230, ensuring a good seal between the valve disc 230 and the valve seat.

[0023] The valve disc 230 is a movable part that opens or closes the valve under pressure or temperature.

[0024] The inlet of safety valve 100 is connected to the two outlets of inlet pipe seat 201, and the outlet of safety valve 100 is connected to the two inlets of outlet pipe seat 301. The outlet switching valve 300 includes: pressure ring 220, valve disc 230 and valve stem 240; valve disc 230 is fixed to the end of valve stem 240, and a groove 250 is reserved on the valve disc 230 of outlet switching valve 300, and a bimetallic strip 260 is provided in the groove 250.

[0025] The valve seat is fixedly installed at the two outlets of the inlet pipe seat 201 and the two inlets of the outlet pipe seat 301.

[0026] The valve stem 240 connects the valve disc 230 to the drive mechanism and is used to control the position of the valve disc 230.

[0027] The groove 250 on valve disc 230 and the bimetallic strip 260 are designed for temperature sensing. Specifically, they utilize the thermal deformation characteristic of the bimetallic strip 260. The bimetallic strip 260 is connected to the sensor 270 (the bimetallic strip 260 clamps the sensor 270, which is a pressure transmitter (RS-485 / Modbus or CAN)). The two metal strips deform differently when heated. The sensor 270 is connected to an external display screen. If the sensor 270 receives a signal, the pressure transmitter (RS-485 / Modbus or CAN) transmits the signal to an external data acquisition unit or PLC for easy operator monitoring.

[0028] The bimetallic strip 260 is made of two metals with different coefficients of thermal expansion bonded together. When heated, the different degrees of expansion cause bending deformation, which allows displacement between the two metal strips.

[0029] In this embodiment, the bimetallic strip 260 is placed in the groove 250 on the valve disc 230 of the outlet switching valve 300. The functions of the bimetallic strip 260 include: sensing the temperature change at the outlet of the safety valve 100; and connecting the bimetallic strip 260 with the sensor 270 to achieve temperature monitoring.

[0030] In the bimetallic strip 260, the metal strip with a high coefficient of thermal expansion is located on the side away from the valve seat. The design ensures that when heated, the high expansion side bends outward, which more effectively pushes the valve disc 230 towards the valve seat and enhances the sealing effect.

[0031] The bimetallic strip 260 and the groove 250 are interference-fitted, meaning that the bimetallic strip 260 is pressed tightly in the groove 250. This allows for controllable preload or displacement during thermal deformation, improving the sensitivity and reliability of the action and preventing loosening.

[0032] Preferably, the bimetallic strip 260 is manganese-nickel-copper or nickel-steel. These alloys have excellent heat sensitivity and corrosion resistance, and are suitable for stable operation in sterilization process environments with high temperature, high pressure and corrosive media.

[0033] The inlet of safety valve 100 is connected to the two outlets of the inlet seat 201 via Y-tubes. This Y-tube connection is designed to distribute pressure evenly and simplify the piping layout. Simultaneously, it ensures that the inlet ends of the two safety valves 100 receive the medium fairly from the inlet switching valve 200, preventing flow deviation or imbalance.

[0034] A connecting pipe is provided between the two outlets of the inlet pipe seat 201 and the two inlets of the outlet pipe seat 301. A balancing valve is installed on each of the corresponding outlets and inlets of the connecting pipe. This design is to balance the pressure before and after the two safety valves 100, preventing abnormal pressure on the other side due to unilateral operation; and to maintain system pressure balance when switching safety valves 100, avoiding pressure surges or leaks. The balancing valve controls whether the two passages are connected, and closes when it is necessary to isolate a safety valve 100.

[0035] A vent pipe is connected to the connecting pipe between the two balancing valves, and a vent valve is installed on the vent pipe. This design allows for the safe discharge of internal media when the system needs to be depressurized, emptied, or repaired; it improves maintenance safety, avoids high pressure residue, meets the pressure balance and safe venting requirements during in-service maintenance, and ensures the safety of system operation.

[0036] The chain 800 is located between the top transmission mechanism of the inlet switching valve 200 and the outlet switching valve 300, and the chain 800 meshes with the inlet switching valve 200 and the outlet switching valve 300 respectively. When the inlet switching valve 200 is rotated, the chain 800 drives the outlet switching valve 300 to rotate together. This scheme forces the valve stems 240 of the two switching valves to move synchronously.

[0037] Example 2: Figure 5-6 As shown, the difference between this embodiment and Embodiment 1 is that this embodiment provides a double-pole safety relief switch device, including a pair of safety valves 100, an inlet switching valve 200, and an outlet switching valve 300 arranged in parallel. The inlet pipe seat 201 of the inlet switching valve 200 has one inlet and two outlets, and the outlet pipe seat 301 of the outlet switching valve 300 has one outlet and two inlets. The inlets of the safety valves 100 are respectively connected to the two outlets of the inlet pipe seat 201, and the outlets of the safety valves 100 are respectively connected to the two inlets of the outlet pipe seat 301. An oblique through hole 700 is provided between the inlet pipe seat 201 of the inlet switching valve 200 and the outlet pipe seat 301 of the outlet switching valve 300.

[0038] It is an auxiliary communication channel set between the inlet pipe seat 201 of the inlet switching valve 200 and the outlet pipe seat 301 of the outlet switching valve 300, in order to realize internal fluid diversion or pressure balance.

[0039] The oblique through-hole 700 is connected to the outlet end of the outlet switching valve 300 outlet pipe seat 301 via pipe 900, and the pipe 900 between the oblique through-hole 700 and the outlet pipe seat 301 is inclined to the horizontal plane. A valve is installed on pipe 900. The inclined design helps to: prevent liquid accumulation; allow natural drainage or guide fluid, and improve system reliability. When the liquid temperature in pipe 900 is too high, the pipe 900 can be opened to provide oblique impact force, forming a compound vortex, reducing the impact of the liquid on the device. Furthermore, after pipe 900 is opened, the overall liquid flow rate of the device increases, thereby alleviating the overheating of the entire system and ensuring the continuity and safety of system operation.

[0040] The other design schemes in this embodiment are the same as those in Embodiment 1.

[0041] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. The mechanical over-temperature and over-pressure double safety relief switch device for sterilization kettle, comprising a pair of safety valves and inlet switching valves and outlet switching valves arranged side by side, characterized in that, The inlet switching valve has one inlet and two outlets in its inlet pipe seat, and the outlet switching valve has one outlet and two inlets in its outlet pipe seat. The inlet of the safety valve is connected to the two outlets of the inlet pipe seat, and the outlet of the safety valve is connected to the two inlets of the outlet pipe seat. The outlet switching valve includes a pressure ring, a valve disc, and a valve stem. The valve disc is fixed to the end of the valve stem, and a groove is reserved on the valve disc of the outlet switching valve, with a bimetallic strip installed in the groove.

2. The mechanical over-temperature and over-pressure dual safety relief switch device for sterilization pot as claimed in claim 1, wherein, The bimetallic strip consists of two different metal strips bonded together, with the metal strip having a higher coefficient of thermal expansion positioned on the side furthest from the valve seat.

3. The mechanical over-temperature and over-pressure dual safety relief switch device for sterilization pot according to claim 2, characterized in that, The bimetallic strip is interference-fitted with the groove.

4. The mechanical over-temperature and over-pressure dual safety relief switch device for sterilization pot as claimed in claim 3, wherein, Preferably, the bimetallic strips are manganese-nickel-copper and nickel-steel, respectively.

5. The mechanical over-temperature and over-pressure double-gang safety relief switch device for sterilization autoclave as described in claim 3, characterized in that, The bimetallic strip is connected to the sensor.

6. The mechanical over-temperature and over-pressure dual safety relief switch device for sterilization pot as claimed in claim 1, wherein, The inlet of the safety valve is connected to the two outlets of the inlet pipe seat via Y-tubes.

7. The mechanical over-temperature and over-pressure double-gang safety relief switch device for sterilization autoclave as described in claim 1, wherein a connecting pipe is provided between the two outlets of the inlet pipe seat and between the two inlets of the outlet pipe seat, and a balancing valve is provided on the corresponding two outlets and inlets of the connecting pipe.

8. The mechanical over-temperature and over-pressure dual safety relief switch device for sterilization pot according to claim 7, characterized in that: A vent pipe is connected to the connecting pipe between the two balance valves, and a vent valve is installed on the vent pipe.

9. A double-pole safety relief switch device, comprising a pair of safety valves, an inlet switching valve, and an outlet switching valve arranged in parallel, characterized in that, The inlet switching valve has one inlet and two outlets, and the outlet switching valve has one outlet and two inlets. The inlet of the safety valve is connected to the two outlets of the inlet valve, and the outlet of the safety valve is connected to the two inlets of the outlet valve. An oblique through hole is provided between the inlet valve and the outlet valve.

10. The dual safety relief switch device of claim 9, wherein: The oblique through hole is connected to the outlet end of the outlet switching valve outlet pipe seat through a pipe, and the pipe between the oblique through hole and the outlet pipe seat is set at an angle to the horizontal plane.

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