A thermostat for a water heater

Abstract

The utility model provides a kind of temperature controller for water heater, including shell, guide plate and the cover of metal material, bimetallic disc is provided between cover and guide plate, bimetallic disc is protruding towards cover and is in abutment with cover in initial state;Guide plate and shell are provided with contact group and operating lever between, operating lever one end is worn out shell, other end and bimetallic disc abut, the side of operating lever is fixed with the push plate for controlling the electric connection of contact group inside Break, contact group is electrically connected with external contact piece, and external contact piece is connected into water heater circuit;Cover is detachably connected with the temperature sensing rod of metal material on the side away from shell, and temperature sensing rod is inserted into the water body heated in water heater.The utility model provides a kind of temperature controller for water heater, by setting and cover connection temperature sensing rod, and make bimetallic disc and cover abut, so that the heat of water body in water heater can be more quickly transferred to bimetallic disc, to improve the response speed and reliability of temperature controller.

Description

Technical Field

[0001] This utility model relates to the field of thermostat technology, specifically to a thermostat for water heaters. Background Technology

[0002] In daily life, storage-type electric water heaters are widely used in homes and commercial establishments to provide hot water. Their overheat protection requires a thermostat. Currently, liquid-expansion thermostats are commonly used to better sense water temperature; however, their temperature sensing relies on the liquid, resulting in a slow sensing speed and an inability to quickly respond to temperature changes. Utility Model Content

[0003] This utility model provides a thermostat for water heaters to solve the problem of slow temperature sensing speed in existing thermostats for water heaters.

[0004] To achieve the above objectives, the present invention adopts the following technical solutions:

[0005] A thermostat for a water heater includes a cylindrical housing with one open end and a metal cover detachably mounted on the housing and sealing the housing. The housing has an opening in the middle, and a guide plate with the opening in the middle is also installed at the open end of the housing. The cover encloses the guide plate, and the guide plate is recessed towards the inside of the housing, so that there is a first mounting cavity between the cover and the guide plate. A bimetallic disc is disposed in the first mounting cavity, and the bimetallic disc protrudes towards the cover and abuts against the cover in the initial state.

[0006] A second mounting cavity is formed between the guide plate and the housing. A contact assembly and an operating rod are provided in the second mounting cavity. One end of the operating rod passes through the central opening of the housing and protrudes outside the housing. The other end of the operating rod passes through the central opening of the guide plate and abuts against the bimetallic disc. A push plate is fixed to the side of the operating rod. The push plate is used to push the contact assembly and control the on / off of the electrical connection inside the contact assembly. The contact assembly is electrically connected to an outer contact piece fixed outside the housing. The outer contact piece is connected to the water heater circuit.

[0007] A metal temperature sensor is detachably connected to the side of the cover away from the casing. The temperature sensor extends into the water being heated in the water heater.

[0008] Furthermore, an auxiliary rod is provided between the operating lever and the bimetallic disc. The operating lever abuts against the auxiliary rod, and the auxiliary rod abuts against the bimetallic disc. The auxiliary rod is installed in the central opening of the guide plate.

[0009] Furthermore, two sets of contact plates are provided inside the housing. The two sets of contact plates are rotationally symmetrical about the axis of the housing. Two push plates are formed on the operating lever to simultaneously push the two sets of contact plates.

[0010] Furthermore, the contact assembly includes a first fixed plate and a second fixed plate made of conductive material. Both the first fixed plate and the second fixed plate are connected and fixed to the housing. A first connecting pin extending out of the housing is connected to the first fixed plate. The first connecting pin is electrically connected to an external contact piece. A moving contact is installed on the side of the first fixed plate near the second fixed plate.

[0011] The second fixed plate is connected to a second connecting pin that extends out of the housing. The second connecting pin is electrically connected to an external contact piece, and the external contact piece connected to the first connecting pin and the external contact piece connected to the second connecting pin are connected to the same circuit.

[0012] A U-shaped spring sheet is fixedly connected to the second fixed plate. One end of the spring sheet is fixedly connected to the second fixed plate, and a moving contact is fixed to the other end. When the first and second fixed plates are installed and fixed inside the housing and the spring sheet is not affected by external force, the moving contact abuts against the fixed contact, and the contact sheet group is electrically connected inside.

[0013] The push plate abuts against the reed. When the bimetallic disc is heated and jumps, causing the operating lever to move, the push plate drives the reed to compress, the moving contact separates from the fixed contact, and the internal electrical connection of the contact assembly is disconnected.

[0014] Furthermore, the cover has an opening in the middle, and a connecting bolt is detachably installed on the cover. One end of the temperature sensing rod has a threaded hole, and the bolt body passes through the opening in the middle of the cover and is threadedly connected to the temperature sensing rod.

[0015] Furthermore, a threaded hole is formed at one end of the temperature sensing rod, and a connecting post is formed on the side of the cover away from the shell. The connecting post has threads on its outside, and the connecting post can be threadedly connected to the temperature sensing rod.

[0016] Furthermore, a groove is formed at one end of the temperature sensing rod, and an opening is made in the middle of the cover. The temperature sensing rod can be fixedly connected by the engagement of the groove with the opening in the middle of the cover.

[0017] Furthermore, a through hole is formed in the middle of the temperature sensing rod, extending along the length of the temperature sensing rod.

[0018] Furthermore, a ring-shaped protrusion is formed on the side of the cover near the inside of the housing, so that the ring-shaped protrusion abuts against the bimetallic disc;

[0019] A spring is placed between the bimetallic disc and the guide plate. The spring is elastic and provides elastic force to the bimetallic disc, so that the bimetallic disc remains in contact with the cover.

[0020] Furthermore, the outer contour of the cross-section of the temperature sensing rod is one of the following: circular, elliptical, irregular circular, or polygonal.

[0021] The beneficial effects of this utility model are as follows:

[0022] The thermostat for water heaters of this invention improves the response speed and reliability of the thermostat by setting a temperature sensing rod connected to the cover and making the bimetallic disc abut against the cover. Attached Figure Description

[0023] Figure 1 An exploded view of a thermostat used in water heaters;

[0024] Figure 2 A top view of a thermostat used in a water heater;

[0025] Figure 3 for Figure 2 Sectional view of section AA;

[0026] Figure 4 for Figure 3 A magnified view of part B in the middle section;

[0027] Figure 5 A schematic diagram of the assembly of the contact assembly and the operating lever;

[0028] Figure 6 This is a front view of the contact assembly;

[0029] Figure 7 This is a cross-sectional view of the cap and temperature sensing rod assembled in another embodiment;

[0030] Figure 8 for Figure 7 A magnified view of part C in the middle;

[0031] Figure 9 This is a cross-sectional view of the cap and temperature sensing rod assembled in another embodiment;

[0032] Figure 10 for Figure 9 A magnified view of part D in the middle;

[0033] Figure 11 This is a perspective view of the temperature sensing rod in another embodiment.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. Housing; 2. Cover; 21. Annular boss; 3. Guide plate; 4. Bimetallic disc; 41. Spring; 5. Contact assembly; 51. First fixed plate; 511. First connecting pin; 512. Fixed contact; 52. Second fixed plate; 521. Second connecting pin; 53. Spring; 531. Moving contact; 6. Operating lever; 61. Push plate; 7. Auxiliary lever; 8. External contact piece; 9. Temperature sensing rod; 91. Connecting bolt; 92. Connecting post; 93. Slot. Detailed Implementation

[0036] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0037] like Figure 1-4 As shown, this utility model embodiment provides a bipolar rapid temperature sensing thermostat for water heaters, including a cylindrical shell 1 with one open end and a cover 2 detachably installed on the shell 1 and closing the shell 1. The shell 1 has an opening in the middle, and a guide plate 3 with the opening in the middle is also installed at the open end of the shell 1. The cover 2 covers the guide plate 3 inside, and the guide plate 3 is recessed towards the inside of the shell 1, so that there is a first mounting cavity between the cover 2 and the guide plate 3. A bimetallic disc 4 is disposed in the first mounting cavity, and the bimetallic disc 4 protrudes towards the cover 2 and abuts against the cover 2 in the initial state (the bimetallic disc 4 is made of two metal materials with different coefficients of thermal expansion). The bimetallic disc 4 is assembled together. When heated to a certain temperature, due to the different thermal expansion rates of the two metals, it will cause the bimetallic disc 4 to jump and deform into a triggered state that is away from the protrusion of the cover 2. When cooled to a certain temperature, pressure is applied to the bimetallic disc 4, which can cause the bimetallic disc 4 to jump and deform back to the initial state. The bimetallic disc 4 has various embodiments in the prior art. The specific structure and materials of the bimetallic disc 4 will not be described in detail here. The first mounting cavity limits the bimetallic disc 4, so that the bimetallic disc 4 can only switch between the initial state and the triggered state in the first mounting cavity, and cannot change its spatial position to produce displacement or rotation.

[0038] A second mounting cavity is formed between the guide plate 3 and the housing 1. A contact assembly 5 and an operating rod 6 are disposed within the second mounting cavity. One end of the operating rod 6 protrudes from the housing 1 through a central opening, while the other end abuts against an auxiliary rod 7 installed within the central opening of the guide plate 3. A push plate 61 is fixed to the side of the operating rod 6. The push plate 61 is used to push the contact assembly 5 and control the electrical connection within the contact assembly 5. Connecting pins in the contact assembly 5 extend outside the housing 1 and are electrically connected to external contact pieces 8 fixed outside the housing 1 (specifically, the external contact pieces 8 are connected to an external circuit, and each contact assembly 5 is electrically connected to two external contact pieces 8; the electrical connection within the contact assembly 5...). (The connection / disconnection affects the connection / disconnection of the external circuit connected to the external contact piece 8); the auxiliary rod 7 is made of ceramic, and the end of the auxiliary rod 7 away from the operating rod 6 abuts against the bimetallic disc 4; after the bimetallic disc 4 is heated to the point of popping, the bimetallic disc 4 pushes the auxiliary rod 7 to move, thereby indirectly pushing the operating rod 4 to move. The movement of the operating rod 4 causes the push plate 61 to push the contact piece group 5, thereby disconnecting the electrical connection inside the control contact piece group 5; after the bimetallic disc 4 cools down, by pressing the end of the operating rod 6 that extends out of the housing 1, the auxiliary rod 7 pushes the bimetallic disc 4 to pop again and return to the initial state, and after the push plate 61 moves, the electrical connection inside the contact piece group is restored.

[0039] Specifically, such as Figure 4-6 As shown, two sets of contact groups 5 are provided inside the housing 1. The two sets of contact groups 5 are rotationally symmetrical about the axis of the housing 1. Correspondingly, two push plates 61 are formed on the operating lever 6 for simultaneously pushing the two contact groups 5. The contact group 55 specifically includes a first fixed plate 51 and a second fixed plate 52 made of conductive material. Both the first fixed plate 51 and the second fixed plate 52 are connected and fixed to the housing 1. A first connecting pin 511 extending out of the housing 1 is connected to the first fixed plate 51. The first connecting pin 511 is electrically connected to an external contact 8. A moving contact 512 is installed on the side of the first fixed plate 51 near the second fixed plate 52. A second connecting pin 521 extending out of the housing 1 is connected to the second fixed plate 52. The second connecting pin 521 is electrically connected to an external contact 8, and the first... The outer contact piece 8 connected by the connecting pin 521 and the outer contact piece 8 connected by the second connecting pin 521 are connected to the same circuit. A U-shaped spring 53 is fixedly connected to the second fixed plate 52. One end of the spring 53 is fixedly connected to the second fixed plate 52, and a moving contact 531 is fixed to the other end. When the first fixed plate 51 and the second fixed plate 52 are installed and fixed in the housing 1 and the spring 53 is not affected by external force, the moving contact 531 abuts against the fixed contact 512, that is, the contact piece group 5 is electrically connected. The push plate 61 abuts against the spring 53. When the bimetallic disc 4 is heated and jumps, causing the operating lever 6 to move, the push plate 61 drives the spring 53 to compress, causing the moving contact 531 to separate from the fixed contact 512, that is, the contact piece group 5 is electrically disconnected.

[0040] As a major improvement of this utility model, a temperature sensing rod 9 is detachably connected to the side of the cover 2 away from the housing 1. When this utility model is installed inside the water heater, the temperature sensing rod 9 extends into the heated water in the water heater, thereby guiding the heat to the cover 2, so that the bimetallic disc 4 that abuts against the cover 2 can also be heated.

[0041] In one specific embodiment, the cover 2 has an opening in the middle, and a connecting bolt 91 is detachably installed on the cover 2. One end of the temperature sensing rod 9 has a threaded hole, and the bolt body of the connecting bolt 91 passes through the opening in the middle of the cover 2 and is threadedly connected to the temperature sensing rod 9.

[0042] In another specific embodiment, such as Figure 7-8 As shown, a threaded hole is formed at one end of the temperature sensing rod 9, and a connecting post 92 is formed on the side of the cover 2 away from the housing 1. The connecting post 92 has threads on its outside and can be threadedly connected to the temperature sensing rod 9.

[0043] In another specific embodiment, such as Figure 9-10 As shown, a groove 93 is formed at one end of the temperature sensing rod 9, and an opening is formed in the middle of the cover 2. The temperature sensing rod 9 can be fixedly connected by fitting the groove 93 with the opening in the middle of the cover 2.

[0044] Considering the need for lightweighting of the temperature sensing rod 9, in a specific improved embodiment, a through hole is formed in the middle of the temperature sensing rod 9, extending along the length of the temperature sensing rod 9, i.e., the temperature sensing rod 9 has a cylindrical structure; the outer contour of the cross-section of the temperature sensing rod 9 can be circular, elliptical, irregularly circular, or as shown in the figure. Figure 11 As shown in the polygon, considering the need to maximize the contact area between the temperature sensing rod and the water body within the same volume, thereby improving heat conduction efficiency while controlling costs, the outer contour of the cross-section of the temperature sensing rod 9 is preferably circular.

[0045] Obviously, the heating of the bimetallic disc 4 in this invention depends on the contact between the bimetallic disc 4 and the cover 2. To improve the reliability of the contact between the bimetallic disc 4 and the cover 2, in a preferred embodiment, a ring-shaped protrusion 21 is formed on the side of the cover 2 near the inside of the housing 1, so that the ring-shaped protrusion 21 can contact the bimetallic disc 4. In another preferred embodiment, a spring sheet 41 is provided between the bimetallic disc 4 and the guide plate 3, and the elasticity of the spring sheet 41 itself allows the bimetallic disc 4 to maintain contact with the cover 2.

[0046] Taking into account the cost, durability, and thermal and electrical conductivity of the components, the cover 2 in this utility model is made of metal, specifically a pure metal or alloy containing at least one of aluminum, copper, and stainless steel, and the temperature sensing rod 9 is made of metal, specifically a pure metal or alloy containing at least one of aluminum, copper, and stainless steel.

[0047] In summary, the thermostat for water heaters of this invention, by setting a temperature sensing rod 9 connected to the cover 2 and making the bimetallic disc 4 abut against the cover 2, allows the heat of the water in the water heater to be transferred to the bimetallic disc 4 more quickly, thereby improving the response speed and reliability of the thermostat, and at a lower cost.

[0048] The embodiments described above merely illustrate the implementation of this utility model, and should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A thermostat for a water heater, characterized in that, It includes a cylindrical shell (1) with one end open and a metal cover (2) that is detachably installed on the shell (1) and closes the shell (1). The shell (1) has an opening in the middle. A guide plate (3) with an opening in the middle is also installed at the open end of the shell (1). The cover (2) covers the guide plate (3) inside. The guide plate (3) is recessed towards the inside of the shell (1), so that there is a first mounting cavity between the cover (2) and the guide plate (3). A bimetallic disc (4) is provided in the first mounting cavity. The bimetallic disc (4) protrudes towards the cover (2) and abuts against the cover (2) in the initial state. A second mounting cavity is formed between the guide plate (3) and the housing (1). The second mounting cavity is provided with a contact assembly (5) and an operating rod (6). One end of the operating rod (6) passes through the middle opening of the housing (1) and exits the housing (1). The other end of the operating rod (6) passes through the middle opening of the guide plate (3) and abuts against the bimetallic disc (4). A push plate (61) is fixed on the side of the operating rod (6). The push plate (61) is used to push the contact assembly (5) and control the electrical connection inside the contact assembly (5). The contact assembly (5) is electrically connected to the outer contact piece (8) fixed outside the housing (1). The outer contact piece (8) is connected to the water heater circuit. A metal temperature sensing rod (9) is detachably connected to the side of the cover (2) away from the shell (1), and the temperature sensing rod (9) is inserted into the heated water in the water heater.

2. The thermostat for a water heater according to claim 1, characterized in that, An auxiliary rod (7) is also provided between the operating lever (6) and the bimetallic disc (4). The operating lever (6) abuts against the auxiliary rod (7), and the auxiliary rod (7) abuts against the bimetallic disc (4). The auxiliary rod (7) is installed in the middle opening of the guide plate (3).

3. The thermostat for a water heater according to claim 1, characterized in that, The housing (1) is provided with two sets of contact pieces (5), which are symmetrical about the axis of the housing (1). The operating rod (6) has two push plates (61) for simultaneously pushing the two sets of contact pieces (5).

4. The thermostat for a water heater according to claim 1, characterized in that, The contact assembly (5) includes a first fixed plate (51) and a second fixed plate (52) made of conductive material. Both the first fixed plate (51) and the second fixed plate (52) are connected and fixed to the housing (1). A first connecting pin (511) extending out of the housing (1) is connected to the first fixed plate (51). The first connecting pin (511) is electrically connected to an external contact piece (8). A moving contact (531) is installed on the side of the first fixed plate (51) near the second fixed plate (52). The second fixed plate (52) is connected to a second connecting pin (521) that extends out of the housing (1). The second connecting pin (521) is electrically connected to an external contact piece (8), and the external contact piece (8) connected to the first connecting pin (511) and the external contact piece (8) connected to the second connecting pin (521) are connected to the same circuit. A U-shaped spring sheet (53) is fixedly connected to the second fixed plate (52). One end of the spring sheet (53) is fixedly connected to the second fixed plate (52), and a moving contact (531) is fixed to the other end. When the first fixed plate (51) and the second fixed plate (52) are installed and fixed inside the housing (1) and the spring sheet (53) is not affected by external force, the moving contact (531) abuts against the fixed contact (512), and the contact assembly (5) is electrically connected inside. The push plate (61) abuts against the reed (53). When the bimetallic disc (4) is heated and jumps, causing the operating lever (6) to move, the push plate (61) drives the reed (53) to compress, the moving contact (531) separates from the fixed contact (512), and the contact assembly (5) is in an electrically disconnected state.

5. The thermostat for a water heater according to claim 1, characterized in that, The cover (2) has an opening in the middle and a connecting bolt (91) is detachably installed on the cover (2). One end of the temperature sensing rod (9) has a threaded hole. The bolt part of the connecting bolt (91) passes through the opening in the middle of the cover (2) and is threadedly connected to the temperature sensing rod (9).

6. The thermostat for a water heater according to claim 1, characterized in that, One end of the temperature sensing rod (9) has a threaded hole, and a connecting post (92) is formed on the side of the cover (2) away from the shell (1). The connecting post (92) has threads on the outside, and the connecting post (92) can be threadedly connected to the temperature sensing rod (9).

7. The thermostat for a water heater according to claim 1, characterized in that, One end of the temperature sensing rod (9) has a groove (93) and the cover (2) has an opening in the middle. The temperature sensing rod (9) can be fixedly connected by fitting the groove (93) with the opening in the middle of the cover (2).

8. The thermostat for a water heater according to claim 1, characterized in that, A through hole is formed on the temperature sensing rod (9) along the length direction of the temperature sensing rod (9).

9. The thermostat for a water heater according to claim 1, characterized in that, A ring-shaped boss (21) is formed on the side of the cover (2) near the inside of the shell (1), so that the ring-shaped boss (21) abuts against the bimetallic disc (4); A spring sheet (41) is provided between the bimetallic disc (4) and the guide plate (3). The spring sheet (41) is elastic and provides elastic force to the bimetallic disc (4), so that the bimetallic disc (4) remains in contact with the cover (2).

10. The thermostat for a water heater according to claim 1, characterized in that, The outer contour of the cross-section of the temperature sensing rod (9) is one of the following: circular, elliptical, irregular circular or polygonal.

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