A pressure type temperature controller with a new temperature regulating mechanism

Abstract

A pressure-type thermostat with a novel temperature adjustment mechanism includes a switch box assembly, a bellows assembly, a pressure plate, an adjustment plate, a main body, a bracket, a main body tension spring, a cam and an adjustment shaft. The adjustment plate is provided with four convex parts, an upwardly curved handle, a downwardly curved hook, a hole provided in the downwardly curved part and an oblong hole in the middle. The adjustment plate is installed under the bracket and connected to the front and rear guide grooves of the main body by sliding left and right through the four convex parts. The handle of the adjustment plate is in contact with the cam lift surface, and the hook of the adjustment plate is in contact with the vertical part of the pressure plate. Since the motion state of the adjustment plate changes from swinging to sliding, there is no lever ratio problem, and a cam with a smaller lift can be used, thereby reducing the cam's external dimensions; since the handle of the adjustment plate is in line contact with the cam lift surface, the service life of the thermostat is increased; at the same time, the temperature adjustment mechanism can achieve forced shutdown.

Description

Technical Field

[0001] The invention relates to the technical field of refrigeration control thermostats, and in particular to a pressure type thermostat with a novel temperature regulating mechanism. Background Art

[0002] Chinese patent CN206758357U discloses a pressure-type thermostat for refrigeration control, which consists of a switch box assembly 1, a push rod 2, a bellows assembly 3, a main body 7, a bracket 8, a pressure plate 4, an adjustment plate 5, a tension spring 6, a cam 9, an adjustment shaft 10, etc. Its working principle is that as the temperature sensing temperature increases, the pressure of the special working fluid filled in the bellows assembly 3 increases, so that the bellows overcomes the tension of the tension spring 6 to push the pressure plate 4 to swing counterclockwise, and pushes the switch box assembly 1 to be connected through the push rod 2. The stretching amount of the tension spring 6 is adjusted by the adjustment plate 5 and the rotating cam 9. As the cam 9 rotates to different positions, the position of the handle 502 of the adjustment plate 5 in contact with the cam 9 will change. These changes change the swing angle of the adjustment plate 5 around the fulcrum 501 installed on the two side walls of the main body 7, thereby changing the tension of the tension spring 6.

[0003] Currently, all pressure-type thermostats used for refrigeration control use this swing-structured adjustment plate to achieve temperature regulation.

[0004] The temperature control mechanism of this pressure-type thermostat has the following disadvantages: first, due to the lever ratio problem of the adjustment plate 5 working in a swinging state, a cam with a larger lift is required to enable the tension spring to have a certain range of stretching adjustment, and its stretching adjustment is not directly obtained, which brings great difficulties to the design of the lift of the cam 9; second, due to the different swing angles of the adjustment plate 5 when the cam 9 is in different lift positions, that is, the angle between the lift surface of the cam 9 and the contacting surface of the adjustment plate handle 502 is an acute angle of not less than 5°, so the adjustment plate handle 502 and the cam 9 can only be in point contact, and the wear resistance of the contact between the two is poor, thereby reducing the service life of the pressure-type thermostat. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a pressure-type temperature controller with a new temperature control structure, which replaces the existing vertical swinging adjustment plate with a horizontal sliding adjustment plate, can reduce the lift of the cam, reduce the size of the cam, and greatly improve the working life of the entire pressure-type temperature controller; at the same time, it also has the function of forced shutdown.

[0006] The technical solution proposed by the present invention is as follows:

[0007] The cam is a kind of pressure type temperature controller with novel temperature regulating mechanism, comprises switch box assembly, push rod, bellows assembly, pressure plate, tension spring, main body, bracket, cam, and adjusting shaft, and the pressure plate supported on the fulcrum controls the switch of the switch box assembly to open and close through the push rod, and an adjusting shaft and cam are arranged above the bracket, and an adjusting plate is arranged below the middle part of the bracket, and the adjusting plate is respectively provided with two convex pieces on the front and rear sides, a hole is arranged on the downward vertical bending part on the right side, a handle is arranged vertically upward in the middle part of the right side, a hook is arranged vertically downward on the left side, and an oblong hole is opened in the middle part, and the adjusting plate is installed in the corresponding guide grooves arranged on the front and rear sides of the main body through two convex pieces on the front and rear sides respectively and is slidably connected, the handle of the adjusting plate is in line contact with the lift surface of the cam, the temperature regulating screw passes through the hole of the adjusting plate and is threadedly connected with one end of the tension spring, and the other end of the tension spring is connected with the vertical section of the pressure plate, and the vertical section of the pressure plate is also provided with a vertical part, and the hook of the adjusting plate is in contact and connected with the vertical part of the pressure plate.

[0008] The surface of the handle of the adjustment plate that contacts the cam lift surface is an arc-shaped surface.

[0009] Compared with the prior art, the present invention has the following significant effects:

[0010] (1) The pressure-type temperature controller of the present invention adopts a novel structure of the adjusting plate, which changes the movement of the adjusting plate from vertical swinging to horizontal sliding. Therefore, there is no problem of the lever ratio of the adjusting plate. The lift of the cam is equivalent to the tensile change of the tension spring, and there is no need to rely on a cam with a larger lift. Therefore, the design of the cam is simplified and the external dimensions of the cam are reduced.

[0011] (2) Since the vertical adjustment plate handle is in line contact with the cam lift surface, the wear at the contact point between the cam and the adjustment plate handle is greatly reduced, thereby increasing the service life of the entire pressure type thermostat.

[0012] (3) The regulating plate of the novel structure can also realize the forced shutdown function. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The present invention is a schematic diagram of the structure of a pressure-type temperature controller with a novel temperature regulating mechanism.

[0014] Figure 2 yes Figure 1 Schematic top view of .

[0015] Figure 3 yes Figure 1 A top view of the adjustment plate is shown.

[0016] Explanation of the numbers in the figure: 1. switch box assembly; 2. push rod; 3. bellows assembly; 4. pressure plate; 4-1. fulcrum; 4-2. vertical part; 5. adjustment plate; 5-1. hole; 5-2. handle; 5-3. oblong hole; 5-4. hook; 5-5. convex; 6. tension spring; 7. main body; 8. bracket; 9. cam; 10. adjustment shaft. DETAILED DESCRIPTION

[0017] The present invention is further described in detail by the following examples.

[0018] See also Figure 1 to Figure 3 As shown, a pressure-type temperature controller with a novel temperature regulating mechanism includes a switch box assembly 1, a push rod 2, a bellows assembly 3, a pressure plate 4, a tension spring 6, a main body 7, a bracket 8, a cam 9, and an adjusting shaft 10. The pressure plate 4 supported on a fulcrum 4-1 controls the switch of the switch box assembly 1 to open and close through the push rod 2. An adjusting shaft 10 and a cam 9 are provided above the bracket 8, and an adjusting plate 5 is provided below the middle of the bracket 8. The adjusting plate 5 is provided with two convex parts 5-5 on the front and rear sides, respectively, a hole 5-1 is provided on the right side of the downward vertical bending part, a vertical upward handle 5-2 is provided in the middle of the right side, and a handle 5-2 is provided at the bottom of the bracket 8. A hook portion 5-4 is bent vertically downward on the left side, and an oblong hole 5-3 is opened in the middle. The adjusting plate 5 is installed in the corresponding guide grooves on the front and rear sides of the main body 7 through two convex protrusions 5-5 on the front and rear sides and is slidably connected. The handle 5-2 of the adjusting plate 5 is in line contact with the lift surface of the cam 9. The temperature adjusting screw passes through the hole 5-1 of the adjusting plate 5 and is threadedly connected to one end of the tension spring 6. The other end of the tension spring 6 is connected to the vertical section of the pressure plate 4. The vertical section of the pressure plate 4 is also provided with a vertical portion 4-2. The hook portion 5-4 of the adjusting plate 5 is in contact with the vertical portion 4-2 of the pressure plate 4.

[0019] The surface where the handle 5 - 2 of the adjustment plate 5 contacts the lifting surface of the cam 9 is an arc-shaped surface.

[0020] The working principle and process of a pressure-type temperature controller with a novel temperature adjustment mechanism of the present invention are as follows:

[0021] The adjusting plate 5 is formed by stamping a steel plate. The adjusting plate 5 is horizontally slidably connected to the guide grooves corresponding to the front and rear side walls of the main body 7 by four convex parts 5-5 on the front and rear sides. Due to the restrictions of the front and rear side walls of the main body 7, the adjusting plate 5 can only move inside the main body 7. The stretching amount of the tension spring 6 can be adjusted by adjusting the temperature adjustment screw. The handle 5-2 on the right side of the adjusting plate 5 that is bent vertically upward is in line contact with the lift surface of the cam 9. The lift of the cam 9 is equivalent to the stretching adjustment amount of the tension spring 6. The adjusting shaft 10 and the cam 9 are riveted together as one and installed in the central circular hole of the bracket 8 and can rotate freely. When the cam 9 rotates in the lift section between the cold point and the warm point through the adjusting shaft 10, the tension of the tension spring 6 can be adjusted. When the bellows assembly 3 produces a pressure change due to temperature rise and fall, the tension can be balanced to make the pressure plate 4 swing and drive the switch to open and close, thereby realizing different temperature controls. At this time, the hook 5-4 bent vertically downward on the left side of the adjusting plate 5 will not contact the vertical part 4-2 of the pressure plate 4, so it will not affect the horizontal sliding action of the pressure plate 4; when the cam 9 is transferred to the high lift section (forced shutdown lift section) through the adjusting shaft 10, the hook 5-4 bent vertically downward on the left side of the adjusting plate 5 can move the vertical part 4-2 of the pressure plate 4 to swing to the right, so that the pressure plate 4 swings clockwise with the fulcrum 4-1 as the rotation center, so that the push rod 2 withdraws to the right, and the switch of the switch box assembly 1 is disconnected to realize the forced shutdown function. Since an oblong hole 5-3 is provided in the middle of the adjustment plate 5, when the adjustment plate 5 slides horizontally left and right, interference between the adjustment plate 5 and the adjustment shaft 10 can be avoided regardless of whether the contact point between the cam 9 and the adjustment plate handle 5-2 is located in the lowest lift section or the highest lift section of the cam 9.

Claims

1. A pressure-type temperature controller with a novel temperature regulating mechanism, comprising a switch box assembly (1), a push rod (2), a bellows assembly (3), a pressure plate (4), a tension spring (6), a main body (7), a bracket (8), a cam (9), and an adjusting shaft (10). The pressure plate (4) supported on a fulcrum (4-1) controls the switch of the switch box assembly (1) to open and close via the push rod (2). The adjusting shaft (10) and the cam (9) are provided above the bracket (8). Features: An adjustment plate (5) is provided at the lower middle of the bracket (8), wherein the adjustment plate (5) is provided with two protrusions (5-5) on the front and rear sides respectively, a hole (5-1) is provided on the right side of the downward vertical bending portion, a handle (5-2) is provided in the middle of the right side, a hook (5-4) is provided in the left side of the bending vertically downward, and an oblong hole (5-3) is provided in the middle. The adjustment plate (5) is inserted into the corresponding guide grooves on the front and rear sides of the main body (7) through the two protrusions (5-5) on the front and rear sides and is slidably connected. The handle (5-2) of the adjustment plate (5) is in line contact with the lifting surface of the cam (9). The temperature screw passes through the hole (5-1) of the adjustment plate (5) and is threadedly connected to one end of the tension spring (6). The other end of the tension spring (6) is connected to the vertical section of the pressure plate (4). The vertical section of the pressure plate (4) is also provided with a vertical portion (4-2). The hook portion (5-4) of the adjustment plate (5) is in contact with and connected to the vertical portion (4-2) of the pressure plate (4). When the cam (9) rotates in the lift section between the cold point and the warm point through the adjustment shaft (10), the hook portion (5-4) does not contact the vertical portion (4-2). When the cam (9) rotates to the high lift section through the adjustment shaft (10), the hook portion (5-4) drives the vertical portion (4-2) to swing to the right.

2. The pressure-type thermostat with a novel temperature regulating mechanism according to claim 1, Features: The surface where the handle (5-2) of the adjustment plate (5) contacts the lifting surface of the cam (9) is an arc-shaped surface.

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