Low pressure steam pressure switch

Abstract

The utility model provides a low pressure steam pressure switch, including the air cover and with the air cover connection's casing, the air cover with first installation cavity is formed between the casing, first installation cavity inside is provided with diaphragm, piston piece, first top rod and first elastic piece along first direction in proper order, first direction is the air cover direction of casing, the end of casing away from the air cover forms second installation cavity, be provided with switch subassembly in second installation cavity, switch subassembly with first elastic piece between be provided with second top rod, wherein, diaphragm is under pressure, through piston piece and first top rod will pressure transmission to first elastic piece, first elastic piece after the deformation drives second top rod promotes switch subassembly and carries out the switching, the utility model can induct low pressure steam pressure, realize reaches the function when setting pressure, can apply to steam engine and steamed baozi machine and so on equipment.

Description

Technical Field

[0001] This utility model belongs to the field of pressure switch technology, specifically relating to a low-pressure steam pressure switch. Background Technology

[0002] The core principle of a steam engine or steamed bun machine is to generate saturated steam in a controllable manner and use the high temperature and humidity characteristics of steam to achieve efficient sterilization or heating. Specifically, water is converted into saturated steam that meets food hygiene standards, and the generated steam is transported to the cooking chamber through pipelines. The latent heat release characteristics of the steam are used to exchange heat with tableware or food to achieve sterilization or cooking. Therefore, the stable control of steam pressure is the core to ensure the effectiveness of the steam engine or steamed bun machine.

[0003] Most existing pressure switches used for steam pressure detection employ a linkage mechanism involving a diaphragm, a push rod, and a second spring. A moving contact is located on the second spring. In application, the diaphragm deforms under pressure, pushing the push rod to apply pressure to the second spring. This causes the second spring to disengage the moving contact from the stationary contact, thereby switching the power supply. However, practical research has revealed that this type of pressure switch requires a relatively high pressure to activate the push rod and push the second spring, making it unsuitable for low-pressure detection requirements. Summary of the Invention

[0004] To address the shortcomings of the prior art, this utility model provides a low-pressure steam pressure switch that can sense low-pressure steam and cut off the power supply when the set pressure is reached. It can be applied to equipment such as steam engines and steamed bun machines.

[0005] The technical effects to be achieved by this utility model are realized through the following technical aspects: This utility model provides a low-pressure steam pressure switch, including a gas cover and a housing connected to the gas cover. A first mounting cavity is formed between the gas cover and the housing. A diaphragm, a piston plate, a first push rod and a first spring plate are sequentially arranged in the first mounting cavity along a first direction. The first direction is the direction from which the gas cover faces the housing. A second mounting cavity is formed at one end of the housing away from the gas cover. A switch assembly is disposed in the second mounting cavity, and a second push rod is disposed between the switch assembly and the first spring piece. When the diaphragm is compressed, the pressure is transmitted to the first spring through the piston plate and the first push rod. After the first spring deforms, it drives the second push rod to push the switch assembly to switch.

[0006] In some implementations, a guide clamping ring is also provided in the first mounting cavity. The guide clamping ring is located between the first push rod and the first spring piece. A first guide hole is formed on the guide clamping ring for the first push rod to pass through. By setting the guide clamping ring, the installation of the first spring piece can be limited to a certain extent, and the position movement of the first push rod can also be guided. When the diaphragm is under pressure, the pressure is applied to the guide clamping ring and will not be transmitted to the switch assembly, thus achieving more precise pressure control.

[0007] In some implementations, a first connecting portion for connecting with the housing is formed on the outer periphery of the guide clamping ring, and a second connecting portion is formed on the housing corresponding to the position of the first connecting portion. By setting the cooperative connection relationship between the first connecting portion and the second connecting portion, the installation stability of the guide clamping ring is ensured.

[0008] In some implementations, the first connecting part is a snap-fit, and the second connecting part is a slot. The first connecting part is snapped onto the second connecting part and protrudes outside the housing, which facilitates manual positioning and installation of the guide clamping ring and facilitates checking whether it is installed in place.

[0009] In some implementations, the guide clamping ring has a connecting hole for balancing the first mounting cavity with the external air pressure. The connecting hole connects to the slot, and this connection helps to maintain a balance with the external pressure, ensuring that the switching assembly switches under a set pressure.

[0010] In some implementations, a second guide hole is formed on the housing between the first mounting cavity and the second mounting cavity for the second push rod to pass through. The second guide hole guides the second push rod during installation, thereby improving the stability of its position movement.

[0011] In some implementations, the switch assembly includes a switch base and a common terminal and a normally closed terminal passing through the switch base, wherein the outer wall of the switch base is sealed to the inner wall of the housing; A second spring is connected to one end of the common terminal near the second push rod, and a first contact is provided on the end of the second spring away from the common terminal; A second contact is provided on the normally closed terminal near the second push rod; When the diaphragm is compressed, the pressure is transmitted to the first spring through the piston plate and the first push rod. After the first spring deforms, it drives the second push rod to push the second spring, thereby disconnecting the first contact from the second contact and realizing the switching function of the switch assembly.

[0012] In some implementations, an air intake channel is formed on the outside of the air cover, and an external thread is formed on the outside of the air intake channel for connecting with an external pipe. The external thread facilitates the connection between the air intake channel and the external pipe and ensures the stability of the connection with the external pipe.

[0013] In some implementations, a limiting groove is also formed on the outside of the air intake channel; The limiting groove is located at the end of the external thread, and a sealing ring is provided on the limiting groove to ensure the air intake channel and the external pipe are sealed.

[0014] In some implementations, the air cover and the housing are riveted together by steel rings to achieve better sealing and pressure-bearing effects.

[0015] In summary, this utility model has at least the following advantages: This utility model provides a low-pressure steam pressure switch. When the diaphragm is pressurized, the pressure is transmitted to the first spring through the piston plate and the first push rod, causing the first spring to switch and deform, thereby realizing the rapid switching of the switch assembly. Since the first push rod only presses on the first spring with a small area, a small force is enough to achieve the switching deformation of the first spring, thereby realizing low-pressure control. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the pressure switch provided in Embodiment 1 of this utility model; Figure 2 Cross-sectional view of the pressure switch provided in Embodiment 1 of this utility model Figure 1 ; Figure 3 Cross-sectional view of the pressure switch provided in Embodiment 1 of this utility model Figure 2 ; Figure 4 An exploded view of the pressure switch provided in Embodiment 1 of this utility model; Figure 5 This is a schematic diagram of the structure of the guide clamping ring provided in Embodiment 1 of this utility model; Figure 6 This is a schematic diagram of the structure of the shell provided in Embodiment 1 of this utility model; Figure 7 This is a schematic diagram of the pressure switch provided in Embodiment 2 of this utility model; Figure 8 This is a schematic diagram of the pressure switch provided in Embodiment 3 of this utility model; Marked in the image: 1. Air cover; 110. Air intake passage; 111. External thread; 2. Housing; 210. Second mounting cavity; 220. Second connecting part; 230. Second guide hole; 3. First mounting cavity; 4. Diaphragm; 5. Piston plates; 6. First push rod; 7. First shrapnel; 8. Switch assembly; 801. Switch base; 802. Common terminal; 803. Normally closed terminal; 804. Second spring; 805. First contact; 806. Second contact; 9. Second push rod; 10. Guide clamping ring; 101. First guide hole; 102. First connecting part; 103. Communicating hole; 11. Sealing ring; 12. Steel rim. Detailed Implementation

[0017] To facilitate understanding of the present invention, a more comprehensive description will be given below in conjunction with the accompanying drawings and specific embodiments. The drawings illustrate preferred embodiments of the invention. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0018] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0019] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0021] Example 1: Please see Figures 1-6 A low-pressure steam pressure switch includes a gas cover 1 and a housing 2 connected to the gas cover 1. A first mounting cavity 3 is formed between the gas cover 1 and the housing 2. Specifically, the gas cover 1 has a first opening at the end facing the housing 2, and the housing 2 has a second opening at the end facing the gas cover 1. The first opening and the second opening are connected relative to each other, and the first opening and the second opening together form the first mounting cavity 3. Here, there is no specific limitation on the external shape of the gas cover 1 and the housing 2. In common scenarios, the gas cover 1 and the housing 2 are in the shape of a disc.

[0022] The first mounting cavity 3 is provided with a diaphragm 4, a piston plate 5, a first push rod 6, and a first spring plate 7 arranged sequentially along a first direction. The first direction is the direction from the gas cover 1 towards the housing 2, and it is also the axial direction of the low-pressure steam pressure switch. In one example, the diaphragm 4 is located between the gas cover 1 and the housing 2, dividing the gas cover 1 and the housing 2 into two chambers, that is, dividing the first mounting cavity 3 into two chambers, so that the diaphragm 4 can deform under a certain pressure difference. The piston plate 5 is connected to the side of the diaphragm 4 facing the housing 2. Both the diaphragm 4 and the piston plate 5 are circular, and the diameter of the piston plate 5 is smaller than the diameter of the diaphragm 4. A shaft hole is formed in the middle of the piston plate 5 for guiding and limiting the installation of the first push rod 6. One end of the first push rod 6 is inserted into the shaft hole, and the other end of the first push rod 6 abuts against the first spring plate 7.

[0023] A second mounting cavity 210 is formed at the end of the housing 2 away from the gas cover 1. A switch assembly 8 is disposed in the second mounting cavity 210. A second push rod 9 is disposed between the switch assembly 8 and the first spring 7.

[0024] Here, the switch assembly 8 is placed in the second mounting cavity 210 on the housing 2 at the end away from the gas cover 1, which can effectively separate the switch assembly 8 from the first mounting cavity 3, so that the switch assembly 8 is not subjected to continuous pressure in the first mounting cavity 3, and is isolated from water vapor, etc., effectively ensuring the switching accuracy and service life of the switch assembly 8.

[0025] When the diaphragm 4 is under pressure, the pressure is transmitted to the first spring 7 through the piston plate 5 and the first push rod 6. After the first spring 7 deforms, it drives the second push rod 9 to push the switch assembly 8 to switch.

[0026] Here, the first spring 7 is selected as a dome switch. A dome switch is a functional element designed based on the principle of metal elastic deformation. It can deform when pressed by the first push rod 6 and rebound quickly when released. In this example, when the diaphragm 4 is pressed, the diaphragm 4 bulges and deforms towards the piston plate 5, causing the piston plate 5 to move. This causes the piston plate 5 to push the first push rod 6 towards the first spring 7. When the pressure reaches a certain value, the first spring 7 deforms. The deformation of the first spring 7 quickly drives the second push rod 9 to switch the switch assembly 8. Compared with the traditional method of setting only one push rod between the diaphragm 4 and the switch assembly 8, this embodiment sets the linkage of the first push rod 6, the first spring 7, and the second push rod 9, which can more sensitively switch the switch assembly 8 and avoid switching failure. It is suitable for low-pressure steam pressure detection, and of course, it is also suitable for other scenarios that require pressure detection.

[0027] In some implementations, reference Figure 3 and Figure 4 The first mounting cavity 3 is also provided with a guide clamping ring 10. The guide clamping ring 10 is located between the first push rod 6 and the first spring 7. The guide clamping ring 10 has a first guide hole 101 for the first push rod 6 to pass through. By setting the guide clamping ring 10, the installation of the first spring 7 can be limited to a certain extent. At the same time, it can also guide the position movement of the first push rod 6. When the diaphragm 4 is under pressure, the pressure is applied to the guide clamping ring 10 and will not be transmitted to the switch assembly 8, so as to achieve a more precise and sensitive pressure control.

[0028] As is known, a first mounting cavity 3 is formed between the first opening of the gas cap 1 and the second opening of the housing 2. The first spring piece 7 is located in the first mounting cavity 3. More specifically, the first spring piece 7 is located in the second opening of the housing 2 and is limited to the bottom of the second opening by the guide clamping ring 10. To improve the installation stability of the first spring piece 7, a limiting groove matching the outer dimensions of the first spring piece 7 is formed at the bottom of the second opening of the housing 2. Similarly, a limiting step is formed at the outer periphery of the second opening to limit the installation of the guide clamping ring 10. The first guide hole 101 is formed in the middle of the guide clamping ring 10 and can guide the positional movement of the first push rod 6.

[0029] In this embodiment, by setting a guide pressure ring 10, when the diaphragm 4 is under pressure, the pressure is applied to the guide pressure ring 10. Compared with the traditional pressure being applied directly to the switch assembly 8, this embodiment can achieve a more precise and sensitive pressure control.

[0030] In some implementations, reference Figure 5 and Figure 6A first connecting portion 102 for connecting with the housing 2 is formed on the outer periphery of the guide clamping ring 10. A second connecting portion 220 is formed on the housing 2 at the position corresponding to the first connecting portion 102. By setting the cooperative connection relationship between the first connecting portion 102 and the second connecting portion 220, the installation stability of the guide clamping ring 10 is ensured.

[0031] Specifically, the first connecting part 102 is a snap-fit, and the second connecting part 220 is a slot. The first connecting part 102 is snapped onto the second connecting part 220 and protrudes outside the housing 2, which facilitates manual positioning and installation of the guide clamping ring 10 and facilitates checking whether it is installed in place.

[0032] Furthermore, the guide clamping ring 10 has a connecting hole 103 for balancing the first mounting cavity 3 with the external air pressure. The connecting hole 103 connects to the slot, and through this connection, it achieves the function of maintaining balance with the external pressure, ensuring that the switch assembly 8 switches under the set pressure.

[0033] It is known that the diaphragm 4 divides the first mounting cavity 3 into a first chamber and a second chamber. The first chamber is the space between the diaphragm 4 and the air cover 1, and the second chamber is the space between the diaphragm 4 and the housing 2. When the diaphragm 4 is subjected to pressure and bulges from the first chamber toward the second chamber, the second chamber is connected to the outside through the connecting hole 103 and the slot on the guide clamping ring 10 and is not affected by its volume change, thereby maintaining the pressure stability in the second chamber and ensuring that the first push rod 6 is only subjected to the pressure linkage of the diaphragm 4, thereby ensuring that the switch assembly 8 switches under the set pressure.

[0034] In some implementations, reference Figure 6 A second guide hole 230 is formed on the housing 2 between the first mounting cavity 3 and the second mounting cavity 210 for the second push rod 9 to pass through. The second guide hole 230 plays a role in guiding the installation of the second push rod 9 and improving the stability of its position movement.

[0035] As is known, the first mounting cavity 3 is formed by the first opening of the air cover 1 and the second opening of the housing 2, while the second mounting cavity 210 is formed on the housing 2 at the end away from the air cover 1. That is, the first mounting cavity 3 and the second mounting cavity 210 are in a relative positional relationship. The housing 2 itself forms a partition between the first mounting cavity 3 and the second mounting cavity 210. In order to realize the linkage action of the second push rod 9, a second guide hole 230 is formed on the housing 2 between the first mounting cavity 3 and the second mounting cavity 210 for the second push rod 9 to pass through.

[0036] In some implementations, reference Figure 3The switch assembly 8 includes a switch base 801 and a common terminal 802 and a normally closed terminal 803 passing through the switch base 801. The outer wall of the switch base 801 is sealed to the inner wall of the housing 2, that is, sealed to the inner wall of the second mounting cavity 210.

[0037] A second spring 804 is connected to one end of the common terminal 802 near the second push rod 9, and a first contact 805 is provided on one end of the second spring 804 away from the common terminal 802; a second contact 806 is provided on one end of the normally closed terminal 803 near the second push rod 9.

[0038] When the diaphragm 4 is under pressure, the pressure is transmitted to the first spring 7 through the piston plate 5 and the first push rod 6. After the first spring 7 is deformed, it drives the second push rod 9 to push the second spring 804, so that the first contact 805 and the second contact 806 are disconnected, thereby realizing the switching function of the switch assembly 8.

[0039] Similarly, after the force on the diaphragm 4 gradually decreases to a certain value, the first spring 7 rebounds quickly, pushing the first push rod 6 and piston plate 5 back to their original positions. The second spring 804 returns to its initial state under its own elastic force, so that the first contact 805 and the second contact 806 come into contact.

[0040] This embodiment provides a low-pressure steam pressure switch. When the diaphragm 4 is pressurized, the pressure is transmitted to the first spring 7 through the piston plate 5 and the first push rod 6, causing the first spring 7 to switch and deform, thereby realizing the rapid switching of the switch assembly 8. Since the first push rod 6 only presses on the first spring 7 with a small area, a small force is enough to achieve the switching deformation of the first spring 7, thereby realizing low-pressure control.

[0041] Example 2: This embodiment makes further structural optimizations based on Embodiment 1. Please refer to... Figures 1-6 Based on the above Figure 7 .

[0042] In this embodiment, an air intake channel 110 is formed on the outside of the air cover 1, and an external thread 111 for connecting with an external pipe is formed on the outside of the air intake channel 110. The external thread 111 facilitates the connection of the air intake channel 110 with the external pipe and ensures the stability of the connection with the external pipe.

[0043] Furthermore, a limiting groove is formed on the outside of the air intake channel 110; the limiting groove is located at the end of the external thread 111, and a sealing ring 11 is provided on the limiting groove. The sealing ring 11 is used to ensure the airtightness of the connection between the air intake channel 110 and the external pipe.

[0044] Example 3: This embodiment makes further structural optimizations based on Embodiment 1. Please refer to... Figures 1-6Based on the above Figure 8 .

[0045] In this embodiment, the air cover 1 and the housing 2 are riveted together by a steel ring 12, which can achieve a good sealing and pressure-bearing effect.

[0046] The above description is merely an example and illustration of the structure of this invention, and while the description is specific and detailed, it should not be construed as limiting the scope of this invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this invention, and these obvious substitutions all fall within the protection scope of this invention.

Claims

1. A low-pressure steam pressure switch, characterized in that, It includes an air cover (1) and a housing (2) connected to the air cover (1). A first mounting cavity (3) is formed between the air cover (1) and the housing (2). A diaphragm (4), a piston plate (5), a first push rod (6) and a first spring plate (7) are arranged sequentially in the first mounting cavity (3) along a first direction. The first direction is the direction from the air cover (1) toward the housing (2). A second mounting cavity (210) is formed at one end of the housing (2) away from the gas cover (1). A switch assembly (8) is provided in the second mounting cavity (210). A second push rod (9) is provided between the switch assembly (8) and the first spring (7). When the diaphragm (4) is compressed, the pressure is transmitted to the first spring (7) through the piston plate (5) and the first push rod (6). After the first spring (7) deforms, it drives the second push rod (9) to push the switch assembly (8) to switch.

2. The low-pressure steam pressure switch according to claim 1, characterized in that, The first mounting cavity (3) is also provided with a guide clamping ring (10), which is located between the first push rod (6) and the first spring piece (7). The guide clamping ring (10) has a first guide hole (101) for the first push rod (6) to pass through.

3. The low-pressure steam pressure switch according to claim 2, characterized in that, A first connecting portion (102) for connecting with the housing (2) is formed on the outer periphery of the guide clamping ring (10), and a second connecting portion (220) is formed on the housing (2) at a position corresponding to the first connecting portion (102).

4. The low-pressure steam pressure switch according to claim 3, characterized in that, The first connecting part (102) is a snap fastener, and the second connecting part (220) is a slot. The first connecting part (102) is snapped onto the second connecting part (220) and protrudes outside the housing (2).

5. The low-pressure steam pressure switch according to claim 4, characterized in that, The guide clamping ring (10) has a connecting hole (103) for balancing the first mounting cavity (3) with the external air pressure, and the connecting hole (103) connects to the slot.

6. The low-pressure steam pressure switch according to claim 1, characterized in that, A second guide hole (230) is formed on the housing (2) between the first mounting cavity (3) and the second mounting cavity (210) for the second push rod (9) to pass through.

7. The low-pressure steam pressure switch according to claim 1, characterized in that, The switch assembly (8) includes a switch base (801) and a common terminal (802) and a normally closed terminal (803) passing through the switch base (801). The outer wall of the switch base (801) is sealed to the inner wall of the housing (2). A second spring (804) is connected to one end of the common terminal (802) near the second push rod (9), and a first contact (805) is provided on one end of the second spring (804) away from the common terminal (802). A second contact (806) is provided at one end of the normally closed terminal (803) near the second push rod (9); When the diaphragm (4) is compressed, the pressure is transmitted to the first spring (7) through the piston plate (5) and the first push rod (6). After the first spring (7) is deformed, it drives the second push rod (9) to push the second spring (804), so that the first contact (805) and the second contact (806) are disconnected.

8. The low-pressure steam pressure switch according to claim 1, characterized in that, An air inlet channel (110) is formed on the outside of the air cover (1), and an external thread (111) for connecting to an external pipe is formed on the outside of the air inlet channel (110).

9. The low-pressure steam pressure switch according to claim 8, characterized in that, A limiting groove is also formed on the outside of the air intake channel (110); The limiting groove is located at the end of the external thread (111), and a sealing ring (11) is provided on the limiting groove.

10. The low-pressure steam pressure switch according to any one of claims 1-9, characterized in that, The air cover (1) and the housing (2) are riveted together by a steel ring (12).

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