An adjustable normally closed electromagnetic expansion valve

Abstract

This utility model discloses an adjustable normally closed electromagnetic expansion valve, including a valve body, a transmission rod assembly, a valve core assembly, and a steel ball seat assembly. The valve body is provided with a flow channel 1, a flow channel 2, a flow channel 3, and a valve cavity. Flow channel 2 and flow channel 3 are located on both sides of the valve cavity. The valve body is also provided with a longitudinally arranged transmission cavity and an adjustment cavity. The steel ball seat assembly is fixed in the adjustment cavity, the transmission rod assembly is installed in the transmission cavity, and the steel ball seat assembly is fixed in the adjustment cavity. The steel ball seat assembly includes a connecting block, an adjusting screw, an adjusting spring, a steel ball seat, and a steel ball. The diameter of the steel ball is larger than the diameter of the valve cavity. The adjusting screw is threadedly connected to the connecting block, and one end of the adjusting screw passes through the connecting block and abuts against the lower end of the adjusting spring. This utility model has a reasonable structure. By changing the length of the adjusting block inserted into the valve core tube, the position of the moving block can be adjusted, thereby adjusting the opening degree of the valve core assembly.

Description

Technical Field

[0001] This utility model relates to the field of solenoid valves, and in particular to an adjustable normally closed solenoid expansion valve. Background Technology

[0002] The expansion valve is an important component in a refrigeration system. It is usually installed between the condenser and the evaporator. The expansion valve throttles the high-temperature, high-pressure liquid refrigerant into low-temperature, low-pressure wet vapor, which enters the evaporator to absorb heat and achieve a cooling effect. The expansion valve can be controlled by the thermal head assembly to prevent insufficient utilization of the evaporator area or frosting.

[0003] Existing electromagnetic expansion valves use a transmission rod to push a steel ball downwards, allowing the inlet chamber to communicate with the valve core. The distance the transmission rod travels depends on the pressure applied to it by the air chamber head and the elastic force exerted on the steel ball by the bottom adjusting spring. Current electromagnetic expansion valves can only push the steel ball open at a certain temperature, but due to varying operating environments, this temperature may not be reached or may have already been reached, making this electromagnetic valve incompatible and requiring a different design. To address these issues, a solution is proposed below. Utility Model Content

[0004] The purpose of this invention is to provide an adjustable normally closed electromagnetic expansion valve, which has the advantages of being suitable for various environments and ensuring normal operation of the electromagnetic valve.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0006] An adjustable normally closed electromagnetic expansion valve includes a valve body, a transmission rod assembly, a valve core assembly, and a steel ball seat assembly. The valve body is provided with a flow channel one, a flow channel two, a flow channel three, and a valve cavity. The flow channel two and the flow channel three are located on opposite sides of the valve cavity. The valve body is also provided with a longitudinally arranged transmission cavity and an adjustment cavity. The transmission cavity is located at the upper end of the valve cavity and communicates with the valve cavity. The adjustment cavity is located at the lower end of the valve cavity and communicates with the valve cavity. The flow channel three communicates with the adjustment cavity. The flow channel one communicates with the flow channel two. The valve cavity has two through holes, and the valve cavity communicates with the flow channel one through the two through holes.

[0007] The valve core assembly is installed in the flow channel one, and the valve core assembly is used to block the through hole between the flow channel one and the flow channel two;

[0008] The transmission rod assembly is installed in the transmission cavity. The lower end of the transmission rod assembly passes through the valve cavity and abuts against the upper end of the ball seat assembly. The ball seat assembly is fixed in the adjustment cavity. The ball seat assembly includes a connecting block, an adjusting screw, an adjusting spring, a ball seat, and a steel ball. The connecting block is threaded to the adjustment cavity. The adjusting spring is located at the upper end of the connecting block. The lower end of the ball seat is inserted into the adjusting spring. The steel ball is fixed at the upper end of the ball seat. The diameter of the steel ball is larger than the diameter of the valve cavity. The upper end of the steel ball abuts against the lower end of the valve cavity to seal the through hole between the valve cavity and the adjustment cavity.

[0009] The adjusting screw is threadedly connected to the connecting block, and one end of the adjusting screw passes through the connecting block and abuts against the lower end of the adjusting spring.

[0010] Preferably, the steel ball seat assembly further includes a shock-absorbing spring, which is sleeved on the upper end of the adjusting spring, and the outer wall of the shock-absorbing spring abuts against the inner wall of the adjusting cavity.

[0011] Preferably, the outer wall and inner hole of the connecting block are both fitted with adjusting part sealing rings, the outer edge of the adjusting part sealing ring on the outer wall of the connecting block abuts against the inner wall of the adjusting cavity, and the adjusting screw passes through the sealing ring located inside the connecting block and slides with it.

[0012] Preferably, the transmission rod assembly includes an air box head, a T-shaped bracket, and a transmission rod. The upper end of the T-shaped bracket is connected to the lower end face of the air box head, the upper end of the transmission rod is inserted into the lower end of the T-shaped bracket, a sealing gasket is fitted onto the lower end of the air box head, the outer edge of the sealing gasket abuts against the inner wall of the upper end of the transmission cavity, a transmission part sealing ring is provided on the transmission rod, the outer edge of the transmission part sealing ring abuts against the inner wall of the lower end of the transmission cavity, and the lower end of the transmission rod is located inside the valve cavity.

[0013] Preferably, the valve core assembly is fixed on one side of the valve body. The valve core assembly includes a valve core component and a coil assembly. The coil assembly is connected to the flow channel via a thread. The valve core component is inserted into the coil assembly and is detachably connected to the coil assembly. The coil assembly is used to control the movement of the valve core component.

[0014] Preferably, the coil assembly contains a coil, and the valve core assembly (5) includes a valve core tube that is fixedly connected to the coil assembly by screws.

[0015] Preferably, the valve core assembly includes a valve core tube, a sealing gasket, a valve stem spring, and a valve stem; the valve stem is located inside the valve core tube and is slidably connected to the valve core tube, the valve stem spring abuts against one end of the valve stem, the sealing gasket is fixed to one end of the valve core tube, and the sealing gasket blocks the connection between the flow channel and the valve cavity, the sealing gasket has a through hole, and the end of the valve stem is located on one side of the through hole.

[0016] The beneficial effects of this utility model are as follows: by rotating the adjusting screw, the length of the adjusting screw extending into the adjusting cavity can be changed, thereby changing the compression of the adjusting spring and thus changing the elastic force applied by the adjusting spring to the steel ball. This allows the transmission rod to push the steel ball away by applying different magnitudes of force under different environments. Attached Figure Description

[0017] Figure 1 is a schematic diagram of the structure of the embodiment;

[0018] Figure 2 is a schematic diagram of the exploded structure of the embodiment;

[0019] Figure 3 is a schematic diagram of the back of the valve body used in the embodiment;

[0020] Figure 4 is a cross-sectional view of the valve body in the embodiment;

[0021] Figure 5 is a cross-sectional view of the valve core assembly in the embodiment.

[0022] Reference numerals: 1. Valve body; 11. Flow channel one; 12. Flow channel two; 13. Flow channel three; 14. Valve cavity; 15. Transmission cavity; 16. Adjustment cavity; 2. Transmission rod assembly; 21. Air box head; 22. T-shaped bracket; 23. Transmission rod; 24. Sealing gasket; 25. Transmission part sealing ring; 3. Coil assembly; 4. Steel ball seat assembly; 41. Connecting block; 42. Adjusting screw; 43. Adjusting spring; 44. Steel ball seat; 45. Steel ball; 46. Anti-vibration spring; 47. Adjustment part sealing ring; 5. Valve core assembly; 51. Valve core tube; 52. Sealing gasket; 53. Valve stem; 54. Valve stem spring. Detailed Implementation

[0023] The following description is merely a preferred embodiment of this utility model, and the scope of protection is not limited to this embodiment. All technical solutions falling within the scope of this utility model's concept should be protected. Identical components are represented by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "bottom" and "top," "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0024] As shown in Figures 1 to 5, an adjustable normally closed electromagnetic expansion valve includes a valve body 1, a transmission rod assembly 2, a valve core assembly, and a steel ball seat assembly 4. The valve body 1 is provided with flow channel 11, flow channel 2 12, flow channel 3 13, and a valve chamber 14. The valve chamber 14 is a longitudinally arranged cylinder. Flow channels 11, 22, and 33 are all horizontally arranged, with flow channels 22 and 33 on the same plane, and flow channel 11 perpendicular to the plane containing the other two flow channels. In this design, flow channel 3 13 is the inlet, flow channel 2 12 is the outlet, and flow channel 11 is the mounting point for the valve core assembly.

[0025] The valve body 1 is also provided with a longitudinally arranged transmission chamber 15 and an adjustment chamber 16. The transmission chamber 15 is located at the upper end of the valve chamber 14 and communicates with the valve chamber 14. The transmission rod assembly 2 is fixed in the transmission chamber 15. The flow channel 3 13 communicates with the adjustment chamber 16, and the flow channel 2 13 communicates with the adjustment chamber 16.

[0026] 12 is connected to valve chamber 14, and flow channel 11 is connected to flow channel 2 12.

[0027] The regulating chamber 16 is located at the lower end of the valve chamber 14 and communicates with the valve chamber 14. The steel ball seat assembly 4 is located inside the regulating chamber 16. The steel ball seat assembly 4 includes a connecting block 41, an regulating spring 43, an anti-vibration spring 46, a steel ball seat 44, and a steel ball 45 arranged sequentially from bottom to top. The connecting block 41 is threaded to the bottom of the regulating chamber 16, so that the entire steel ball seat assembly 4 can be fixed inside the regulating chamber 16.

[0028] The diameter of the steel ball 45 is larger than the diameter of the valve cavity 14. The upper end of the steel ball 45 abuts against the lower end of the valve cavity 14. In the initial state, the steel ball 45 seals the lower end of the valve cavity 14, preventing the coolant from flowing through the valve body 1. If a downward force is applied to the steel ball 45, compressing the adjusting spring 43, the steel ball 45 will separate from the lower end of the valve cavity 14, allowing the coolant to enter the valve cavity 14 and flow out from the flow channel 12.

[0029] The ball seat assembly 4 also includes an adjusting screw 42, which is threadedly connected to the connecting block 41. One end of the adjusting screw 42 passes through the connecting block 41 and abuts against the lower end of the adjusting spring 43. Adjusting part sealing rings 47 are engaged on both the outer wall and the inner hole of the connecting block 41. The outer edge of the adjusting part sealing ring 47 on the outer wall of the connecting block 41 abuts against the inner wall of the adjusting cavity 16. The adjusting screw 42 passes through the sealing ring located inside the connecting block 41 and slides against it. Rotating the adjusting screw 42 changes the length of the adjusting screw 42 inside the adjusting cavity 16, causing the adjusting spring 43 to be compressed again or relaxed, thus changing the supporting elastic force of the adjusting spring 43 on the ball 45.

[0030] The transmission rod assembly 2 includes, from top to bottom, an air box head 21, a T-shaped bracket 22, and a transmission rod 23. When the temperature of the air box head 21 reaches a set value, its interior deforms, pushing the T-shaped bracket 22 and the transmission rod 23 downwards. In the initial position, the lower end of the transmission rod 23 abuts against the upper surface of the steel ball 45. When the temperature changes, the air box head 21 pushes the T-shaped bracket 22 and the transmission rod 23 downwards, causing the transmission rod 23 to push the steel ball 45 downwards. The thrust required for the transmission rod 23 to push the steel ball 45 away varies depending on the supporting force of the adjusting spring 43 on the steel ball 45, thus making the solenoid valve suitable for various environments.

[0031] A sealing gasket 24 is fitted onto the lower end of the gasket head 21. The outer edge of the sealing gasket 24 abuts against the inner wall of the upper end of the transmission cavity 15. A transmission part sealing ring 25 is provided on the transmission rod 23. The outer edge of the transmission part sealing ring 25 abuts against the inner wall of the lower end of the transmission cavity 15. The sealing gasket 24 can prevent fluid from contacting the gasket head 21, and the transmission part sealing ring 25 can prevent liquid fluid from contacting gaseous fluid above.

[0032] The valve core assembly is fixed to the flow channel 11 on one side of the valve body 1. The valve core assembly includes a valve core component 5 and a coil assembly 3. The coil assembly 3 contains a coil and is connected to the flow channel 12 via threads. The valve core component 5 includes a valve core tube 51, a sealing gasket 52, a valve stem 53, a spring, and a valve stem 53. The valve core tube 51 is inserted into the coil assembly 3, with one end located in the flow channel 11 and the other end fixedly connected to the coil assembly 3 via screws. The valve stem 53 is located inside the valve core tube 51 and is slidably connected to it. The spring abuts against one end of the valve stem 53. The sealing gasket 52 is fixed to one end of the valve core tube 51 and blocks the connection between the flow channel 12 and the valve cavity 14. The sealing gasket 52 has a through hole, and the end of the valve stem 53 is located on one side of the through hole.

[0033] The movable block can drive the valve stem 53 to move along the length of the valve core tube 51 under the action of electromagnetic force. In this design, initially, one end of the valve stem 53 maintains a certain distance from the sealing gasket 52, so that the through hole on the sealing gasket 52 remains in a normally closed state. The normally closed state is maintained by the valve stem 53 spring sleeved on the valve stem 53. When the movable block drives the valve stem 53 away from the sealing gasket 52, it will stretch the valve stem 53 spring, so that after the electromagnetic force disappears, it can push the valve stem 53 towards the sealing gasket 52, so that the through hole on the sealing gasket 52 remains blocked.

[0034] The specific embodiments described above further illustrate the technical problems, technical solutions, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An adjustable normally closed electromagnetic expansion valve comprising a valve body (1), a drive rod assembly (2), a valve core assembly and a steel ball seat assembly (4), characterized in that, The valve body (1) is provided with flow channel one (11), flow channel two (12), flow channel three (13) and valve cavity (14). Flow channel two (12) and flow channel three (13) are located on both sides of valve cavity (14). The valve body (1) is also provided with a longitudinally arranged transmission cavity (15) and adjustment cavity (16). The transmission cavity (15) is located at the upper end of valve cavity (14) and communicates with valve cavity (14). The adjustment cavity (16) is located at the lower end of valve cavity (14) and communicates with valve cavity (14). Flow channel three (13) communicates with adjustment cavity (16). Flow channel one (11) communicates with flow channel two (12). Two through holes are opened in valve cavity (14). Valve cavity (14) communicates with flow channel one (11) through the two through holes. The valve core assembly is installed in the first flow channel (11), and the valve core assembly is used to block the through hole between the first flow channel (11) and the second flow channel (12); The transmission rod assembly (2) is installed in the transmission cavity (15), and the lower end of the transmission rod assembly (2) passes through the valve cavity (14) and abuts against the upper end of the steel ball seat assembly (4); The ball seat assembly (4) is fixed in the adjustment cavity (16). The ball seat assembly (4) includes a connecting block (41), an adjusting screw (42), an adjusting spring (43), a ball seat (44), and a ball (45). The connecting block (41) is threadedly connected to the adjustment cavity (16). The adjusting spring (43) is located at the upper end of the connecting block (41). The lower end of the ball seat (44) is inserted into the adjusting spring (43). The ball (45) is fixed at the upper end of the ball seat (44). The diameter of the ball (45) is larger than the diameter of the valve cavity (14). The upper end of the ball (45) abuts against the lower end of the valve cavity (14) to seal the through hole between the valve cavity (14) and the adjustment cavity (16). The adjusting screw (42) is threadedly connected to the connecting block (41), and one end of the adjusting screw (42) passes through the connecting block (41) and abuts against the lower end of the adjusting spring (43).

2. An adjustable normally closed electromagnetic expansion valve according to claim 1, characterized in that The steel ball seat assembly (4) also includes a shock-absorbing spring (46), which is sleeved on the upper end of the adjusting spring (43), and the outer wall of the shock-absorbing spring (46) abuts against the inner wall of the adjusting cavity (16).

3. An adjustable normally closed electromagnetic expansion valve according to claim 1, wherein An adjustment sealing ring (47) is snapped onto both the outer wall and the inner hole of the connecting block (41). The outer edge of the adjustment sealing ring (47) located on the outer wall of the connecting block (41) abuts against the inner wall of the adjustment cavity (16). The adjustment screw (42) passes through the sealing ring located inside the connecting block (41) and slides with it.

4. The adjustable normally closed electromagnetic expansion valve according to claim 1, wherein The transmission rod assembly (2) includes an air box head (21), a T-shaped bracket (22) and a transmission rod (23). The upper end of the T-shaped bracket (22) is connected to the lower end face of the air box head (21). The upper end of the transmission rod (23) is inserted into the lower end of the T-shaped bracket (22). A sealing gasket (24) is fitted onto the lower end of the air box head (21). The outer edge of the sealing gasket (24) abuts against the inner wall of the upper end of the transmission cavity (15). A transmission part sealing ring (25) is provided on the transmission rod (23). The outer edge of the transmission part sealing ring (25) abuts against the inner wall of the lower end of the transmission cavity (15). The lower end of the transmission rod (23) is located in the valve cavity (14).

5. An adjustable normally closed electromagnetic expansion valve according to claim 1, characterized in that, The valve core assembly is fixed on one side of the valve body (1). The valve core assembly includes a valve core component (5) and a coil assembly (3). The coil assembly (3) is connected to the flow channel (12) by a thread. The valve core component (5) is inserted into the coil assembly (3) and is detachably connected to the coil assembly (3). The coil assembly (3) is used to control the movement of the valve core component (5).

6. An adjustable normally closed electromagnetic expansion valve according to claim 5, characterized in that, The coil assembly (3) contains a coil, and the valve core assembly (5) includes a valve core tube (51) which is fixedly connected to the coil assembly (3) by screws.

7. An adjustable normally closed electromagnetic expansion valve according to claim 5, characterized in that, The valve core assembly (5) includes a valve core tube (51), a sealing gasket (52), a valve stem (53) spring, and a valve stem (53). The valve stem (53) is located inside the valve core tube (51) and is slidably connected to the valve core tube (51). The valve stem (53) spring abuts against one end of the valve stem (53). The sealing gasket (52) is fixed to one end of the valve core tube (51) and blocks the connection between the flow channel (12) and the valve cavity (14). The sealing gasket (52) has a through hole, and the end of the valve stem (53) is located on one side of the through hole.

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