Multi-pole temperature controller

Abstract

The utility model provides a multi-pole temperature controller which comprises a shell and a sealing cover detachably arranged above the shell, a partition plate is arranged in the shell, a placing groove is formed in the upper surface of the partition plate, a bimetal disc is arranged in the placing groove, the middle of the bimetal disc protrudes towards the sealing cover in the initial state, and the middle of the bimetal disc protrudes towards the sealing cover in the initial state. The sealing cover and the containing groove form a closed interval for limiting the bimetallic disc, a rear cover is detachably arranged below the shell, a push rod and a plurality of contact piece sets are arranged in a cavity defined by the partition plate and the rear cover, the contact piece sets are sequentially arranged at intervals, each contact piece set comprises a first static contact piece, a second static contact piece and a movable contact piece, and the first static contact piece, the second static contact piece and the movable contact piece are arranged in the cavity. A boss used for being installed with the spring in an interference fit mode is arranged at the spring installation position on the rear cover, the section of the boss is round, and the diameter of the round section is larger than the inner diameter of the spring. According to the multi-pole temperature controller provided by the utility model, through the interference fit between the boss and the spring, the spring cannot be dislocated in the use process.

Description

Technical Field

[0001] The utility model relates to the technical field of thermostats, and particularly relates to a multi-pole thermostat. Background Art

[0002] In order to ensure the normal operation of equipment with a relatively high working temperature such as boilers, a thermostat is required for circuit protection. The thermostat can automatically cut off the circuit at high temperatures. In order to save costs and streamline the circuit, a multi-pole thermostat that can control the on / off of multiple circuits simultaneously has emerged. For example, the patent document with the publication number CN108109880A discloses a multi-pole thermostat that can control the on / off of four circuits simultaneously. However, for the multi-pole thermostat disclosed in this patent document and other multi-pole thermostats disclosed in the prior art, in order to achieve the control of multiple circuits, a single ejector rod is required to control multiple contact groups simultaneously. Springs for maintaining the contact between the moving and static contacts are provided in each contact group. When the ejector rod pushes the moving contacts in each contact group, the springs in each contact group may be subjected to a thrust inclined to the telescopic direction due to the deflection of the ejector rod, resulting in easy dislocation of the springs, and thus the reliability of the thermostat is insufficient. In order to overcome the deficiency in the reliability of the existing multi-pole thermostat, its structure needs to be improved. Content of the Utility Model

[0003] An embodiment of the utility model provides a multi-pole thermostat to solve the problems in the prior art that the springs in the multi-pole thermostat are prone to dislocation and the reliability of the multi-pole thermostat is insufficient.

[0004] To achieve the above object, the embodiment of the utility model adopts the following technical solution: A multi-pole thermostat includes a housing and a cover detachably provided above the housing. A partition is provided inside the housing, and the internal space of the housing is divided into two parts, upper and lower, by the partition. A placement groove is formed on the upper surface of the partition, and a bimetallic disc is provided in the placement groove. The middle part of the bimetallic disc protrudes towards the cover in the initial state. The bimetallic disc is formed by bonding two metal materials with different coefficients of thermal expansion.

[0005] The cover and the placement groove form a closed interval for limiting the bimetallic disc. A rear cover is detachably provided below the housing. An ejector rod and a contact group are provided in the cavity formed by the partition and the rear cover. An operation hole penetrating the partition is provided in the housing. The top of the ejector rod passes through the operation hole and contacts the bimetallic disc. A top arm is formed on the side of the ejector rod. The top arm is located below the partition, and the top arm restricts the movement of the ejector rod.

[0006] There are multiple groups of contact pieces arranged at intervals in sequence. Each group of contact pieces includes a first static contact piece, a second static contact piece, and a moving contact piece. The first static contact pieces and the second static contact pieces in each group of contact pieces are correspondingly distributed on both sides of the bottom of the housing, and the ends of the first static contact piece and the second static contact piece close to the center of the housing are fixedly installed on the lower surface of the partition board. The ends of the first static contact piece and the second static contact piece far from the center of the housing extend downward below the rear cover and are used to connect to an external circuit. A spring is arranged between the moving contact piece and the rear cover. The spring provides a supporting force for the moving contact piece and enables the two ends of the moving contact piece to respectively contact the first static contact piece and the second static contact piece in its corresponding group of contact pieces, so that the circuit connected by the contact piece group can be conducted; the top arm abuts against the upper surface of each moving contact piece;

[0007] At the spring installation position on the rear cover, there is a boss for interference fit installation with the spring. The cross-section of the boss is circular, and the diameter of the circular cross-section is larger than the inner diameter of the spring. Through the interference fit between the boss and the spring, the spring is prevented from falling off the boss; a groove for installing the spring is formed at the bottom of the moving contact piece. The groove is a circular groove, and the diameter of the groove is smaller than the outer diameter of the spring.

[0008] Further, the bottom of the ejector rod penetrates downward through the rear cover.

[0009] Further, a transverse groove is formed at the bottom of the partition board in the housing, and the transverse groove restricts the deflection of the top arm in the horizontal plane.

[0010] Further, a longitudinal groove is formed at the bottom of the partition board in the housing. The longitudinal groove restricts the deflection of the moving contact piece in the horizontal plane. The number of longitudinal grooves is the same as and corresponds to the number of moving contact pieces one by one.

[0011] Further, limit blocks are arranged at the ends of the first static contact piece and the second static contact piece far from the center of the housing. Installation grooves are arranged at the installation positions of the first static contact piece and the second static contact piece below the housing. When the first static contact piece and the second static contact piece are installed on the housing, the limit blocks are snapped into the installation grooves.

[0012] Further, a V-shaped groove is formed in the middle of the moving contact piece, and a triangular part matching the shape of the V-shaped groove is formed at the bottom of the top arm. When the top arm pushes the moving contact piece to move, the bottom of the triangular part abuts against the V-shaped groove in the middle of the moving contact piece.

[0013] Further, a snap groove is formed on the outer wall of the housing, and a snap is provided at the bottom of the cover. The shape and structure of the snap at the bottom of the cover and the snap groove outside the housing match each other. When the cover is installed on the housing, the snap is embedded in the snap groove.

[0014] Further, terminals for connecting rivets are arranged at the bottom of the partition board, and the rear cover is fixedly installed at the bottom of the housing through rivets.

[0015] The beneficial effects of the present utility model are:

[0016] The multi-pole thermostat provided by the utility model makes the spring not misalign during use through the interference fit between the boss and the spring, thereby improving the reliability of the multi-pole thermostat and extending its service life. Brief Description of the Drawings

[0017] Figure 1 is an exploded view of the multi-pole thermostat;

[0018] Figure 2 is a perspective view of the multi-pole thermostat;

[0019] Figure 3 is a schematic structural view of the contact piece group;

[0020] Figure 4 is a sectional view of the multi-pole thermostat;

[0021] Figure 5 is a schematic structural view of the housing.

[0022] Description of the Reference Numerals:

[0023] 1. Housing; 2. Cover; 3. Bimetallic disc; 4. Push rod; 5. Partition; 6. Rear cover; 7. Contact piece group; 71. First static contact piece; 72. Second static contact piece; 73. Moving contact piece; 731. Groove; 74. Limit block; 8. Spring; 9. Placing groove; 10. Boss; 11. Top arm; 12. Triangular part; 13. Operation hole; 14. Terminal; 15. Longitudinal groove; 16. Installation groove; 17. Transverse groove. Detailed Description of the Specific Embodiment

[0024] The following details the specific embodiments of the present application in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only for the purpose of illustration and explanation of the present application, and are not intended to limit the present application.

[0025] Such as Figures 1-5As shown in the figure, an embodiment of the present utility model provides a multi-pole thermostat, which includes a housing 1 and a cover 2 detachably disposed above the housing 1. A partition 5 is provided inside the housing 1. The partition 5 divides the internal space of the housing 1 into two parts up and down. A placement groove 9 is formed on the upper surface of the partition 5. A bimetallic disc 3 is disposed in the placement groove 9, and the middle part of the bimetallic disc 3 protrudes towards the cover 2 in the initial state. Since the bimetallic disc 3 is formed by bonding two metal materials with different coefficients of thermal expansion, when heated to a certain temperature, due to the different degrees of thermal expansion of the two metals, the bimetallic disc 3 will produce a sudden jump and deform into a trigger state protruding away from the cover 2. There are various embodiments of the bimetallic disc 3 in the prior art, and the specific structure and materials of the bimetallic disc 3 will not be elaborated here; the cover 2 and the placement groove 9 form a closed interval for limiting the bimetallic disc 3, so that the bimetallic disc 3 can only switch between the initial state and the trigger state within this closed interval, and cannot change its spatial position to produce displacement and rotation;

[0026] A rear cover 6 is detachably disposed below the housing 1. A push rod 4 and a contact group 7 are disposed in the cavity formed by the partition 5 and the rear cover 6. An operation hole 13 penetrating the partition 5 is provided in the housing 1. When the bimetallic disc 3 is bent and deformed, it pushes the push rod 4 to move downward; a top arm 11 is formed on the side of the push rod 4. The top of the push rod 4 passes through the operation hole 13 and contacts the bimetallic disc 3, and the top arm 11 is located below the partition 5. The top arm 11 restricts the movement of the push rod 4, so that the push rod 4 cannot completely pass through the operation hole 13 from bottom to top. The bottom of the push rod 4 penetrates the rear cover 6 downward;

[0027] The contact group 7 has multiple groups and is arranged at intervals in sequence. Each contact group 7 includes a first static contact 71, a second static contact 72 and a moving contact 73. The first static contacts 71 and the second static contacts 72 in each contact group 7 are respectively distributed on both sides of the bottom of the housing 1, and the ends of the first static contact 71 and the second static contact 72 close to the center of the housing 1 are fixedly installed on the lower surface of the partition 5. The ends of the first static contact 71 and the second static contact 72 away from the center of the housing 1 extend downward below the rear cover 6 and are used to connect to an external circuit;

[0028] A spring 8 is provided between the moving contact 73 and the rear cover 6. The spring 8 provides a supporting force for the moving contact 73 and makes both ends of the moving contact 73 contact with the first static contact 71 and the second static contact 72 in its corresponding contact group 7 respectively, so that the circuit connected by the contact group 7 can be conducted;

[0029] The top arm 11 abuts against the upper surface of each moving contact piece 73. When the temperature of the bimetallic disc 3 rises and undergoes a sudden jump deformation to the trigger state, the ejector rod 4 is pushed by the bimetallic disc 3 and moves downward. The top arm 11 pushes each moving contact piece 73 downward, causing each moving contact piece 73 to separate from the corresponding first static contact piece 71 and second static contact piece 72, thereby disconnecting the circuit connected by the contact piece group 7. When the temperature of the bimetallic disc 3 drops and undergoes a sudden jump deformation to the initial state, the spring 8 provides a supporting force to make the moving contact piece 73 and the ejector rod 4 move upward. The two ends of the moving contact piece 73 respectively contact the first static contact piece 71 and the second static contact piece 72 in the corresponding contact piece group 7, thereby restoring the conduction of the circuit connected by the contact piece group 7. It should be noted that when there is a difference between the trigger temperature at which the bimetallic disc 3 suddenly jumps from the initial state to the trigger state and the recovery temperature at which it suddenly jumps from the trigger state to the initial state (usually the recovery temperature is lower than the trigger temperature), after the temperature of the bimetallic disc 3 drops below the trigger temperature, the bimetallic disc 3 can be restored to the initial state by manually pressing the bottom of the ejector rod 4.

[0030] In a preferred embodiment of the present invention, as Figures 1-4 shown, a boss 10 for interference fit installation with the spring 8 is provided at the spring 8 installation position on the rear cover 6. The cross-section of the boss 10 is circular, and the diameter of the circular cross-section is larger than the inner diameter of the spring 8. Through the interference fit between the boss 10 and the spring 8, the spring 8 is prevented from falling off the boss 10, and the displacement of the spring 8 during long-term use is reduced, increasing the safety of the thermostat. A groove 731 for installing the spring 8 is formed at the bottom of the moving contact piece 73. The groove 731 is a circular groove, and the diameter of the groove is smaller than the outer diameter of the spring 8, so that the top end of the spring 8 is stuck into the groove to prevent the spring 8 from being misaligned;

[0031] In a preferred embodiment of the present invention, as Figure 5 shown, a transverse groove 17 is formed at the bottom of the partition plate 5 in the housing 1. The transverse groove 17 restricts the deflection of the top arm 11 in the horizontal plane. A longitudinal groove 15 is formed at the bottom of the partition plate 5 in the housing 1. The longitudinal groove 15 restricts the deflection of the moving contact piece 73 in the horizontal plane. The number of longitudinal grooves 15 is the same as and corresponds one-to-one with the number of moving contact pieces 73.

[0032] In a preferred embodiment of the present invention, a limiting block 74 is provided at one end of the first static contact piece 71 and the second static contact piece 72 away from the center of the housing 1. An installation groove 16 is provided at the installation positions of the first static contact piece 71 and the second static contact piece 72 below the housing 1. When the first static contact piece 71 and the second static contact piece 72 are installed on the housing 1, the limiting block 74 is stuck into the installation groove 16, so that the first static contact piece 71 and the second static contact piece 72 have only longitudinal freedom. A wire hole penetrates through the limiting block 74. The first static contact piece 71 and the second static contact piece 72 are connected to the external wires through the wire holes penetrating through the limiting block 74 and the installation groove 16, so that the thermostat is connected to the external circuit.

[0033] As a preferred embodiment of the present utility model, as Figure 4 shown, a V-shaped groove is formed in the middle of the moving contact piece 73, and a triangular portion 12 matching the shape of the V-shaped groove is formed at the bottom of the top arm 11. When the top arm 11 pushes the moving contact piece 73 to move, the bottom of the triangular portion 12 abuts against the V-shaped groove in the middle of the moving contact piece 73, and the triangular portion 12 is embedded into the V-shaped groove formed in the middle of the moving contact piece 73, so that the relative position between the moving contact piece 73 and the top arm 11 will not change during the movement.

[0034] As a preferred embodiment of the present utility model, a buckle groove is provided on the outer wall of the housing 1, and a buckle is provided at the bottom of the cover 2. The buckle at the bottom of the cover 2 and the shape structure of the buckle groove outside the housing 1 match each other. When the cover 2 is installed on the housing 1, the buckle is embedded into the buckle groove, so that the staff can conveniently disassemble and install the cover 2 from the housing 1.

[0035] As a preferred embodiment of the present utility model, as Figure 5 shown, a terminal 14 for connecting a rivet is provided at the bottom of the partition 5, and the rear cover 6 is fixedly installed at the bottom of the housing 1 through a rivet. Specifically, the rivet penetrates through the rear cover 6 and is connected to the terminal 14.

[0036] For the multi-pole thermostat provided by the present utility model, through the interference fit between the boss 10 and the spring 8, the spring 8 will not be displaced during use, thereby improving the reliability of the multi-pole thermostat and extending the service life of the multi-pole thermostat.

[0037] The above-described embodiments only represent the implementation manners of the present utility model, but should not be construed as limiting the scope of the patent of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the patent of the present utility model should be subject to the appended claims.

Claims

1. A multi-pole thermostat, comprising a housing (1) and a cover (2) detachably provided above the housing (1), characterized in that, A partition plate (5) is arranged inside the housing (1). The partition plate (5) divides the internal space of the housing (1) into two parts vertically. A placement groove (9) is formed on the upper surface of the partition plate (5). A bimetallic disc (3) is arranged in the placement groove (9). The middle part of the bimetallic disc (3) protrudes towards the cover (2) in the initial state. The bimetallic disc (3) is formed by bonding two metal materials with different coefficients of thermal expansion. The cover (2) and the placement groove (9) form a closed interval for limiting the bimetallic disc (3). A rear cover (6) is detachably arranged below the housing (1). A push rod (4) and a contact group (7) are arranged in the cavity formed by the enclosure of the partition plate (5) and the rear cover (6). An operation hole (13) penetrating the partition plate (5) is arranged in the housing (1). The top of the push rod (4) passes through the operation hole (13) and contacts the bimetallic disc (3). A top arm (11) is formed on the side of the push rod (4). The top arm (11) is located below the partition plate (5). The top arm (11) restricts the movement of the push rod (4). There are multiple groups of contact groups (7) arranged at intervals in sequence. Each contact group (7) includes a first static contact (71), a second static contact (72) and a moving contact (73). The first static contacts (71) and the second static contacts (72) in each contact group (7) are distributed on both sides of the bottom of the housing (1) in a one-to-one correspondence. One ends of the first static contact (71) and the second static contact (72) close to the center of the housing (1) are fixedly installed on the lower surface of the partition plate (5). One ends of the first static contact (71) and the second static contact (72) far from the center of the housing (1) extend downward below the rear cover (6) and are used for connecting to an external circuit. A spring (8) is arranged between the moving contact (73) and the rear cover (6). The spring (8) provides a supporting force for the moving contact (73) and enables both ends of the moving contact (73) to contact the first static contact (71) and the second static contact (72) in its corresponding contact group (7) respectively, so that the circuit connected by the contact group (7) can be conducted. The top arm (11) abuts against the upper surface of each moving contact (73). A boss (10) for interference fit installation with the spring (8) is arranged at the spring (8) installation position on the rear cover (6). The cross-section of the boss (10) is circular, and the diameter of the circular cross-section is larger than the inner diameter of the spring (8). Through the interference fit between the boss (10) and the spring (8), the spring (8) is prevented from falling off the boss (10). A groove (731) for installing the spring (8) is formed at the bottom of the moving contact (73). The groove (731) is a circular groove, and the diameter of the groove (731) is smaller than the outer diameter of the spring (8).

2. The multi-pole thermostat according to claim 1, characterized in that, The bottom of the push rod (4) penetrates the rear cover (6) downward.

3. The multi-pole thermostat according to claim 1, characterized in that, A transverse groove (17) is formed at the bottom of the partition plate (5) inside the housing (1). The transverse groove (17) restricts the deflection of the top arm (11) in the horizontal plane.

4. The multi-pole thermostat according to claim 1, characterized in that A longitudinal groove (15) is formed at the bottom of the partition plate (5) inside the housing (1). The longitudinal groove (15) restricts the deflection of the moving contact (73) in the horizontal plane. The number of longitudinal grooves (15) is the same as the number of moving contacts (73) and they are in one-to-one correspondence.

5. The multi-pole thermostat according to claim 1, characterized in that, A limiting block (74) is provided at one end of the first stationary contact piece (71) and the second stationary contact piece (72) away from the center of the housing (1). An installation groove (16) is provided at the installation positions of the first stationary contact piece (71) and the second stationary contact piece (72) below the housing (1). When the first stationary contact piece (71) and the second stationary contact piece (72) are installed on the housing (1), the limiting block (74) is snapped into the installation groove (16).

6. The multi-pole thermostat according to claim 1, wherein A V-shaped groove is formed in the middle of the moving contact piece (73), and a triangular part (12) matching the shape of the V-shaped groove is formed at the bottom of the top arm (11). When the top arm (11) pushes the moving contact piece (73) to move, the bottom of the triangular part (12) abuts against the V-shaped groove in the middle of the moving contact piece (73).

7. The multi-pole thermostat according to claim 1, wherein A snap groove is provided on the outer wall of the housing (1), and a snap is provided at the bottom of the cover (2). The shape and structure of the snap at the bottom of the cover (2) and the snap groove outside the housing (1) match each other. When the cover (2) is installed on the housing (1), the snap is inserted into the snap groove.

8. The multi-pole thermostat according to claim 1, characterized in that, Terminals (14) for connecting rivets are provided at the bottom of the partition plate (5), and the rear cover (6) is fixedly installed at the bottom of the housing (1) by rivets.

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