A split type thermal expansion valve and its use method

Abstract

The invention discloses a split-type thermal expansion valve and a method for using the same, and relates to the technical field of thermal expansion valves. The expansion valve comprises a valve body, a limiting mechanism and an adjusting mechanism. A first mounting frame is installed on the upper end of the valve body, a capillary is installed on the upper end of the first mounting frame, a temperature sensing package is installed on the end of the capillary away from the first mounting frame, a movable plate is horizontally arranged inside the first mounting frame, a fixed disk is horizontally arranged on the inner wall of the valve body, a conical adjusting hole is opened at the center position of the fixed disk, and a conical valve core is arranged inside the conical adjusting hole. The invention provides a sealing belt between the movable plate and the inner wall of the first mounting frame, and provides a limiting ring and a movable frame to limit the movable plate, so that the movable plate can move up and down as a whole. The invention drives the first fixed plate and the valve stem to move by a guide wheel and a pull rope. The moving distance of the valve stem and the conical valve core is twice the moving distance of the movable plate and the guide wheel, thereby increasing the range of adjustment of the conical valve core on the opening of the conical adjusting hole.

Description

Technical Field

[0001] The invention relates to the technical field of thermal expansion valves, in particular to a split-type thermal expansion valve and a use method thereof. Background Art

[0002] Thermostatic expansion valve controls the opening of the expansion valve by the superheat of the gaseous refrigerant at the outlet of the evaporator, so it is widely used in non-flooded evaporators. According to the different balancing methods, thermal expansion valves can be divided into internal balanced and external balanced types. Different materials and methods can be used for filling in the temperature sensing system of the thermal expansion valve. The main methods are liquid filling, gas filling, cross liquid filling, mixed filling and adsorption filling.

[0003] The existing thermal expansion valve has a limited adjustment range because the deformation of the diaphragm connected to the valve needle is limited, which makes the movement displacement of the valve needle small, so the flow adjustment range is small. For cold storage with large load changes or systems using variable frequency compressors, the thermal expansion valve cannot meet the requirements. At the same time, the sensitivity of the diaphragm deformation will also affect the accuracy of the adjustment.

[0004] In view of the above problems, an improved split-type thermal expansion valve and a method of using the same are now designed. Summary of the invention

[0005] The object of the present invention is to provide a split-type thermal expansion valve and a method of using the same to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A split thermal expansion valve comprises a valve body, a limit mechanism and an adjustment mechanism, wherein a first installation frame is installed on the upper end of the valve body, a capillary tube is installed on the upper end of the first installation frame, a temperature sensing package is installed on the end of the capillary tube away from the first installation frame, the temperature sensing package, the capillary tube and the first installation frame are connected, a movable plate is horizontally arranged inside the first installation frame, the side wall of the movable plate is sealed and slid with the inner wall of the first installation frame, and the temperature sensing package, the capillary tube and the first installation frame above the movable plate are all filled with refrigerant.

[0008] A fixed disk is horizontally installed on the inner wall of the valve body, a conical adjustment hole is opened at the center of the fixed disk, a conical valve core used in conjunction with the conical adjustment hole is arranged inside the conical adjustment hole, a valve stem for driving the conical valve core to move is vertically installed at the center of the conical valve core, the upper end of the valve stem passes through the valve body and is connected to the lower end of the movable plate through an adjustment mechanism, an input pipe is installed on the side wall of the valve body below the fixed disk, and an output pipe is installed on the side wall of the valve body above the fixed disk.

[0009] The limiting mechanism is arranged at the lower end of the movable plate and is used to limit the movable plate so that the movable plate can move stably along the inner wall of the first installation frame.

[0010] The regulating mechanism is arranged on the valve body and the first mounting frame, and is used to move the valve stem and the frustum valve core, thereby regulating the opening of the frustum regulating hole.

[0011] The limiting mechanism includes a moving frame, which is installed at the lower end of the moving plate. A limiting ring is installed at one end of the moving frame away from the moving plate. Balls are installed on the side walls of the limiting ring to facilitate the movement of the limiting ring along the inner wall of the first installation frame. The balls roll close to the inner wall of the first installation frame.

[0012] A sealing belt is installed on the side wall of the movable plate, and the sealing belt is installed on the inner wall of the first installation frame away from the side wall of the movable plate.

[0013] The adjusting mechanism comprises a second mounting frame, which is mounted on the lower end of the valve body, a guide wheel is mounted on the lower end of the movable plate, the upper end of the valve stem passes through the top of the valve body and is mounted on a first fixed plate, the upper end of the first fixed plate is mounted on a pull rope, the end of the pull rope away from the first fixed plate passes through the guide wheel and is mounted on the upper end of the valve body, the pull rope is sleeved on the guide wheel, the lower end of the valve stem passes through the bottom of the valve body and is mounted on a second fixed plate, the lower end of the second fixed plate is mounted with a tension spring for pulling the second fixed plate away from the valve body, the end of the tension spring away from the valve body is mounted on the bottom of the second mounting frame, and the side wall of the valve stem is sealingly and slidingly connected to the valve body.

[0014] As a further solution of the present invention: a rib plate for stably connecting with the second fixing plate is installed on the side wall of the valve stem close to the second fixing plate, and the lower end of the rib plate is installed on the upper end of the second fixing plate.

[0015] As a further solution of the present invention: reinforcing ribs are arranged inside the valve stem for improving the structural strength of the valve stem.

[0016] As a further solution of the present invention: the valve body is detachably connected to the first installation frame and the second installation frame by screws.

[0017] As a further solution of the present invention: the movable plate, the guide wheel and the movable frame are fixedly connected together by welding.

[0018] As a further solution of the present invention: the refrigerant in the first installation frame above the temperature sensing package, the capillary tube and the movable plate is Freon.

[0019] A method for using a split-type thermal expansion valve comprises the following steps:

[0020] Step 1: The temperature sensing package is set at the outlet of the evaporator to sense the temperature. The temperature sensing package transfers the temperature to the refrigerant inside, causing the refrigerant to evaporate. The evaporation degree of the refrigerant is different at different temperatures. The evaporation of the refrigerant will cause the pressure above the moving plate to change, thereby causing the moving plate to move.

[0021] Step 2: When the movable plate moves upward, the movable plate drives the guide wheel to move, the guide wheel pulls the pull rope, the pull rope pulls the first fixed plate to move, the first fixed plate drives the valve stem to move upward, the valve stem drives the frustum valve core to move upward, reducing the opening of the frustum adjusting hole, and at the same time the valve stem drives the second fixed plate to move upward, and the second fixed plate stretches the tension spring.

[0022] Step 3: When the movable plate moves downward, the movable plate drives the guide wheel to move. Under the action of elastic force, the tension spring pulls the second fixed plate downward, the second fixed plate drives the valve stem to move downward, the valve stem drives the frustum valve core to move downward, increasing the opening of the frustum adjusting hole. At the same time, the valve stem drives the first fixed plate to move, the first fixed plate drives the pull rope to move, and keeps the pull rope taut.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention sets a sealing belt between the movable plate and the inner wall of the first installation frame, and sets a limiting ring and a movable frame to limit the movable plate, so as to facilitate the overall upward and downward movement of the movable plate. Compared with the traditional diaphragm, the displacement uncertainty caused by the deformation of the diaphragm is avoided, and the movement accuracy of the movable plate is improved.

[0025] The present invention drives the first fixed plate and the valve stem to move through the guide wheel and the pull rope. The guide wheel is a movable pulley. According to the characteristics of the movable pulley, the distance that the valve stem and the frustum valve core move is twice the distance that the movable plate and the guide wheel move. This increases the range of adjustment of the frustum valve core on the opening of the frustum adjustment hole, making it easier for users to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the present invention.

[0027] Figure 2 It is a cross-sectional view of the present invention.

[0028] Figure 3 It is a structural schematic diagram of the frustum adjustment hole in the present invention.

[0029] Figure 4 It is a structural schematic diagram of the limiting mechanism in the present invention.

[0030] Among them: 1. valve body; 2. pull rope; 3. limit ring; 4. sealing belt; 5. first installation frame; 6. moving frame; 7. guide wheel; 8. moving plate; 9. capillary; 10. temperature sensing package; 11. first fixed plate; 12. output pipe; 13. truncated cone valve core; 14. valve stem; 15. second fixed plate; 16. tension spring; 17. second installation frame; 18. input pipe; 19. fixed plate; 20. truncated cone adjustment hole; 21. ball bearing. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] See also Figure 1-Figure 4 In an embodiment of the present invention, a split thermal expansion valve includes a valve body 1, a limit mechanism and an adjustment mechanism. A first mounting frame 5 is installed on the upper end of the valve body 1, a capillary tube 9 is installed on the upper end of the first mounting frame 5, a temperature sensing package 10 is installed at one end of the capillary tube 9 away from the first mounting frame 5, the temperature sensing package 10, the capillary tube 9 and the first mounting frame 5 are connected, a movable plate 8 is horizontally arranged inside the first mounting frame 5, the side wall of the movable plate 8 is sealed and slid with the inner wall of the first mounting frame 5, and the temperature sensing package 10, the capillary tube 9 and the first mounting frame 5 above the movable plate 8 are all filled with refrigerant.

[0033] A fixed disk 19 is horizontally installed on the inner wall of the valve body 1, and a conical adjustment hole 20 is opened at the center of the fixed disk 19. A conical valve core 13 used in conjunction with the conical adjustment hole 20 is arranged inside the conical adjustment hole 20. A valve stem 14 for driving the conical valve core 13 to move is vertically installed at the center of the conical valve core 13. The upper end of the valve stem 14 passes through the valve body 1 and is connected to the lower end of the movable plate 8 through an adjustment mechanism. An input pipe 18 is installed on the side wall of the valve body 1 below the fixed disk 19, and an output pipe 12 is installed on the side wall of the valve body 1 above the fixed disk 19.

[0034] The limiting mechanism is disposed at the lower end of the movable plate 8 and is used to limit the movable plate 8 so that the movable plate 8 can stably move along the inner wall of the first installation frame 5 .

[0035] The regulating mechanism is arranged on the valve body 1 and the first mounting frame 5 , and is used to move the valve stem 14 and the frustoconical valve core 13 , thereby regulating the opening of the frustoconical regulating hole 20 .

[0036] The limiting mechanism includes a moving frame 6, which is installed at the lower end of the moving plate 8. A limiting ring 3 is installed at the end of the moving frame 6 away from the moving plate 8. A ball 21 is installed on the side wall of the limiting ring 3 to facilitate the movement of the limiting ring 3 along the inner wall of the first installation frame 5. The ball 21 rolls close to the inner wall of the first installation frame 5. A sealing belt 4 is installed on the side wall of the moving plate 8. The sealing belt 4 is installed on the inner wall of the first installation frame 5 away from the side wall of the moving plate 8.

[0037] The regulating mechanism comprises a second mounting frame 17, which is mounted on the lower end of the valve body 1, a guide wheel 7 is mounted on the lower end of the movable plate 8, the upper end of the valve stem 14 passes through the top of the valve body 1 and is mounted on a first fixed plate 11, a pull rope 2 is mounted on the upper end of the first fixed plate 11, an end of the pull rope 2 away from the first fixed plate 11 passes through the guide wheel 7 and is mounted on the upper end of the valve body 1, the pull rope 2 is sleeved on the guide wheel 7, the lower end of the valve stem 14 passes through the bottom of the valve body 1 and is mounted on a second fixed plate 15, a tension spring 16 for pulling the second fixed plate 15 away from the valve body 1 is mounted on the lower end of the second fixed plate 15, an end of the tension spring 16 away from the valve body 1 is mounted on the bottom of the second mounting frame 17, and the side wall of the valve stem 14 is sealingly and slidingly connected to the valve body 1.

[0038] Working principle of a split thermal expansion valve:

[0039] When in use, the temperature sensing package 10 is arranged at the outlet of the evaporator for temperature sensing. The temperature sensing package 10 transfers the temperature to the refrigerant inside, causing the refrigerant to evaporate. The evaporation degree of the refrigerant is different at different temperatures. The evaporation of the refrigerant will cause the pressure above the movable plate 8 to change, thereby causing the movable plate 8 to move. The movement principle of the movable plate 8 can refer to the working principle of the existing thermal expansion valve diaphragm.

[0040] When the movable plate 8 moves upward, the movable plate 8 drives the guide wheel 7 to move, the guide wheel 7 pulls the pull rope 2, the pull rope 2 pulls the first fixed plate 11 to move, the first fixed plate 11 drives the valve stem 14 to move upward, the valve stem 14 drives the frustum valve core 13 to move upward, reducing the opening of the frustum adjusting hole 20, and at the same time the valve stem 14 drives the second fixed plate 15 to move upward, and the second fixed plate 15 stretches the tension spring 16.

[0041] When the movable plate 8 moves downward, the movable plate 8 drives the guide wheel 7 to move. Under the action of elastic force, the tension spring 16 pulls the second fixed plate 15 downward, the second fixed plate 15 drives the valve stem 14 downward, the valve stem 14 drives the frustum valve core 13 downward, and increases the opening of the frustum adjusting hole 20. At the same time, the valve stem 14 drives the first fixed plate 11 to move, and the first fixed plate 11 drives the pull rope 2 to move, keeping the pull rope 2 taut.

[0042] It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

Claims

1. A split-type thermal expansion valve, comprising a valve body (1), a limit mechanism and an adjustment mechanism, wherein a first mounting frame (5) is mounted on the upper end of the valve body (1), a capillary tube (9) is mounted on the upper end of the first mounting frame (5), a temperature sensing package (10) is mounted on the end of the capillary tube (9) away from the first mounting frame (5), the temperature sensing package (10), the capillary tube (9) and the first mounting frame (5) are connected, and the valve body (1) is characterized in that: A movable plate (8) is horizontally arranged inside the first installation frame (5), the side wall of the movable plate (8) slides in a sealed manner with the inner wall of the first installation frame (5), and the temperature sensing package (10), the capillary tube (9) and the first installation frame (5) above the movable plate (8) are all filled with refrigerant; A fixed disk (19) is horizontally mounted on the inner wall of the valve body (1), a conical adjustment hole (20) is provided at the center of the fixed disk (19), a conical valve core (13) used in conjunction with the conical adjustment hole (20) is arranged inside the conical adjustment hole (20), a valve stem (14) for driving the conical valve core (13) to move is vertically mounted at the center of the conical valve core (13), the upper end of the valve stem (14) passes through the valve body (1) and is connected to the lower end of the movable plate (8) via an adjustment mechanism, an input pipe (18) is mounted on the side wall of the valve body (1) below the fixed disk (19), and an output pipe (12) is mounted on the side wall of the valve body (1) above the fixed disk (19); The limiting mechanism is arranged at the lower end of the movable plate (8) and is used to limit the movable plate (8) so that the movable plate (8) can move stably along the inner wall of the first installation frame (5); The regulating mechanism is arranged on the valve body (1) and the first mounting frame (5), and is used to move the valve stem (14) and the frustoconical valve core (13), thereby regulating the opening of the frustoconical regulating hole (20); The limiting mechanism comprises a moving frame (6), the moving frame (6) being mounted at the lower end of the moving plate (8), a limiting ring (3) being mounted at one end of the moving frame (6) away from the moving plate (8), a ball (21) being mounted on the side wall of the limiting ring (3) to facilitate the limiting ring (3) to move along the inner wall of the first mounting frame (5), the ball (21) rolling closely against the inner wall of the first mounting frame (5); A sealing belt (4) is installed on the side wall of the movable plate (8), and the sealing belt (4) is installed on the inner wall of the first installation frame (5) away from the side wall of the movable plate (8); The regulating mechanism comprises a second mounting frame (17), wherein the second mounting frame (17) is mounted on the lower end of the valve body (1), a guide wheel (7) is mounted on the lower end of the movable plate (8), the upper end of the valve stem (14) passes through the top of the valve body (1) and is mounted on a first fixed plate (11), the upper end of the first fixed plate (11) is mounted with a pull rope (2), the end of the pull rope (2) away from the first fixed plate (11) passes through the guide wheel (7) and is mounted on the upper end of the valve body (1), the pull rope (2) is sleeved on the guide wheel (7), the lower end of the valve stem (14) passes through the bottom of the valve body (1) and is mounted on a second fixed plate (15), the lower end of the second fixed plate (15) is mounted with a tension spring (16) for pulling the second fixed plate (15) away from the valve body (1), the end of the tension spring (16) away from the valve body (1) is mounted on the bottom of the second mounting frame (17), and the side wall of the valve stem (14) is sealingly and slidably connected to the valve body (1).

2. A split type thermal expansion valve according to claim 1, characterized in that: A rib plate for stably connecting with the second fixing plate (15) is mounted on the side wall of the valve stem (14) close to the second fixing plate (15), and the lower end of the rib plate is mounted on the upper end of the second fixing plate (15).

3. A split type thermal expansion valve according to claim 1, characterized in that: A reinforcing rib for improving the structural strength of the valve stem (14) is arranged inside the valve stem (14).

4. A split type thermal expansion valve according to claim 1, characterized in that: The valve body (1) is detachably connected to the first mounting frame (5) and the second mounting frame (17) by means of screws.

5. A split type thermal expansion valve according to claim 1, characterized in that: The movable plate (8), the guide wheel (7) and the movable frame (6) are fixedly connected together by welding.

6. A split type thermal expansion valve according to claim 1, characterized in that: The refrigerant in the first installation frame (5) above the temperature sensing package (10), the capillary tube (9) and the movable plate (8) is Freon.

7. A method for using the split-type thermal expansion valve according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: The temperature sensing package (10) is arranged at the outlet of the evaporator to sense the temperature. The temperature sensing package (10) transmits the temperature to the refrigerant inside, causing the refrigerant to evaporate. The evaporation degree of the refrigerant is different at different temperatures. The evaporation of the refrigerant causes the pressure above the movable plate (8) to change, thereby causing the movable plate (8) to move; Step 2: When the movable plate (8) moves upward, the movable plate (8) drives the guide wheel (7) to move, the guide wheel (7) pulls the pull rope (2), the pull rope (2) pulls the first fixed plate (11) to move, the first fixed plate (11) drives the valve stem (14) to move upward, the valve stem (14) drives the round table valve core (13) to move upward, reducing the opening of the round table adjustment hole (20), and at the same time the valve stem (14) drives the second fixed plate (15) to move upward, and the second fixed plate (15) stretches the tension spring (16); Step 3: When the movable plate (8) moves downward, the movable plate (8) drives the guide wheel (7) to move. Under the action of elastic force, the tension spring (16) pulls the second fixed plate (15) to move downward, the second fixed plate (15) drives the valve stem (14) to move downward, the valve stem (14) drives the round table valve core (13) to move downward, and increases the opening of the round table adjustment hole (20). At the same time, the valve stem (14) drives the first fixed plate (11) to move, and the first fixed plate (11) drives the pull rope (2) to move, so as to keep the pull rope (2) taut.

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