Valve element of normally-closed electromagnetic expansion valve

Abstract

The utility model discloses a normally closed electromagnetic expansion valve core which comprises a valve seat, a movable iron core and a static iron core, one end of the movable iron core is inserted into an inner hole of the valve seat, a valve core pipe is arranged on the valve seat, the valve core pipe is fixed at the upper end of the valve core seat, the valve core pipe is sleeved on the outer side of the movable iron core, the movable iron core is connected with the valve core pipe in a sliding mode, and the static iron core is connected with the valve seat. The static iron core is fixed to the end, away from the valve seat, of the valve element pipe, a spring is arranged in the valve element pipe, one end of the spring abuts against the lower end of the static iron core, the other end of the spring abuts against the upper end of the movable iron core, a threaded groove is formed in the top end of the static iron core, and the static iron core is connected with an external valve body through the threaded groove. According to the utility model, the structure is reasonable, the ventilation or sealing of the valve core can be realized through the matching between the movable iron core and the static iron core, the valve core can be fixed in the external valve body through the thread groove on the static iron core and the external thread on the valve seat, and the installation is convenient.

Description

Technical Field

[0001] The utility model relates to the field of electromagnetic valves, in particular to a valve core of a normally closed electromagnetic expansion valve. Background Art

[0002] The electromagnetic expansion valve is an electronically controlled component in the air conditioning system, and is mainly used in the refrigeration system to achieve internal optimization control of the air conditioning system. In the electromagnetic expansion valve, the valve core is a valve part used to achieve the basic functions of direction control, pressure control or flow control. Since the valve body itself is small in size, it is inconvenient to install the valve core into the valve body. How to make the valve core more convenient to install into the valve body is the direction of research and development. In response to the above problems, a solution is proposed below. Utility Model Content

[0003] The utility model aims to provide a normally closed electromagnetic expansion valve core, which has the advantages of compact structure and convenient installation.

[0004] The above technical objectives of the utility model are achieved through the following technical solutions:

[0005] A normally closed electromagnetic expansion valve core comprises a valve seat, a moving iron core and a stationary iron core, characterized in that one end of the moving iron core is inserted into the inner hole of the valve seat, a valve core tube is provided on the valve seat, the valve core tube is fixed to the upper end of the valve core seat, and the valve core tube is sleeved on the outer side of the moving iron core, the moving iron core is slidably connected to the valve core tube, the stationary iron core is fixed to the end of the valve core tube away from the valve seat, a spring is provided in the valve core tube, one end of the spring abuts against the lower end of the stationary iron core, and the other end of the spring abuts against the upper end of the moving iron core, a threaded groove is provided on the top of the stationary iron core, the stationary iron core is connected to an external valve body via the threaded groove, an external thread is provided on the valve seat, and the valve seat is connected to an external valve body via the external thread.

[0006] Preferably, the bottom surface of the static iron core is provided with a truncated cone-shaped retaining groove recessed upward, and the upper end of the moving iron core is fixed with a truncated cone-shaped retaining block, and the retaining block is consistent in shape with the retaining groove.

[0007] Preferably, an upper slot is provided at the center of the abutment groove on the bottom surface of the static iron core, a lower slot is provided at the center of the abutment block at the top end of the moving iron core, and both ends of the spring are respectively clamped in the upper slot and the lower slot.

[0008] Preferably, a vertical channel is provided inside the moving iron core, the upper end of the channel is connected to the lower slot, the diameter of the channel is smaller than the diameter of the lower slot, the lower end of the channel passes through the moving iron core and is connected to the outside, and an annular slot is provided at the bottom of the moving iron core, and a gasket is provided in the annular slot.

[0009] Preferably, a seat cavity is provided at the lower end of the valve seat, the lower end of the moving iron core is located in the seat cavity, and the seat cavity is used to place an external pagoda spring.

[0010] Preferably, an O-ring is sleeved on the valve seat, and the O-ring is used to increase the sealing between the valve seat and the external valve body.

[0011] The beneficial effects of the utility model are as follows: the structure of the utility model is simple, the static iron core is fixed on the top of the valve core tube, the valve seat is fixed on the bottom of the valve core tube, and the valve core can be fixed on the external valve body through threaded connection through the thread groove set on the static iron core and the external thread on the valve seat. The moving iron core can move in the valve core tube to adjust the opening and sealing of the valve core, so that the valve core can realize its function. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of an embodiment;

[0013] Figure 2 A cross-sectional view of an embodiment.

[0014] Figure numerals: 1. valve seat; 2. moving iron core; 3. stationary iron core; 4. valve core tube; 5. spring; 6. thread groove; 7. external thread; 8. abutment groove; 9. abutment block; 10. channel; 11. gasket; 12. seat cavity; 13. O-ring. DETAILED DESCRIPTION

[0015] The following is only a preferred embodiment of the present invention, and the protection scope is not limited to this embodiment. All technical solutions under the concept of the present invention should belong to the protection scope of the present invention. The same parts are represented by the same figure marks. It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to the directions in the drawings, and the words "bottom" and "top", "inside" and "outside" refer to the directions toward or away from the geometric center of a specific component, respectively.

[0016] like Figure 1 and Figure 2 As shown, a normally closed electromagnetic expansion valve core includes a valve seat 1, a moving iron core 2 and a stationary iron core 3. A valve core tube 4 is provided at the upper end of the valve seat 1, the interior of the valve core tube 4 is communicated with the inner hole of the valve seat 1, the moving iron core 2 is located in the valve core tube 4, and one end of the moving iron core 2 passes through the inner hole of the valve seat 1 and extends into the seat cavity 12 at the lower end surface of the valve seat 1. The moving iron core 2 can move up and down in the valve core tube 4. The stationary iron core 3 is fixed on the top of the valve core tube 4, and a pagoda spring 5 can be arranged in the seat cavity 12 at the lower end of the valve body, the upper end of the pagoda spring 5 abuts against the lower end of the stationary iron core 3, and the pagoda spring 5 and the stationary iron core 3 can limit the moving range of the moving iron core 2.

[0017] The bottom surface of the static iron core 3 is provided with a truncated cone-shaped groove 8 that is recessed upward, and the upper end of the moving iron core 2 is fixed with a truncated cone-shaped stopper 9, which is consistent in shape and size with the stopper 9 and the groove 8. When the moving iron core 2 moves upward, the stopper 9 can be perfectly filled in the groove 8. Since the shapes of the stopper 9 and the groove 8 are both truncated cones that are small at the top and large at the bottom, even if the relative positions between the moving iron core 2 and the static iron core 3 are not aligned, the stopper 9 can adjust its position along the side wall of the groove 8 during the upward movement, and finally fill the groove 8 completely.

[0018] An upper clamping groove is provided at the center of the abutment groove 8 on the bottom surface of the static iron core 3, a lower clamping groove is provided at the center of the abutment block 9 at the top of the moving iron core 2, a spring 5 is provided in the valve core tube 4, the upper end of the spring 5 is clamped in the upper clamping groove, and the lower end of the spring 5 is clamped in the lower clamping groove. The spring 5 can restore the moving iron core 2 to its initial position when the moving iron core 2 is not subjected to other forces.

[0019] A vertical channel 10 is provided inside the moving iron core 2, and the upper end of the channel 10 is connected to the lower slot. The diameter of the channel 10 is smaller than the diameter of the lower slot, and the lower end of the channel 10 passes through the moving iron core 2 and communicates with the outside. An annular slot is provided at the bottom of the moving iron core 2, and a gasket 11 is provided in the annular slot. The gasket 11 blocks the lower end of the channel 10. A transverse hole is also provided on the side wall of the lower end of the moving iron core 2, and the hole passes through the channel 10 transversely and communicates with the channel 10. The channel 10 and the hole can adjust the amount of fluid passing through according to the position of the moving iron core 2.

[0020] The top of the static iron core 3 is provided with a thread groove 6, and the valve seat 1 is provided with an external thread 7. Through the thread groove 6 and the external thread 7, the static iron core 3 and the valve seat 1 can be connected to the external valve body, which is convenient for the installation of the valve core. The valve seat 1 is sleeved with an O-ring 13, which can increase the sealing performance after the valve seat 1 is connected to the external valve body.

[0021] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A normally closed electromagnetic expansion valve core, comprising a valve seat (1), a moving iron core (2) and a stationary iron core (3), characterized in that: One end of the moving iron core (2) is inserted into the inner hole of the valve seat (1); a valve core tube (4) is provided on the valve seat (1); the valve core tube (4) is fixed to the upper end of the valve core seat, and the valve core tube (4) is sleeved on the outer side of the moving iron core (2); the moving iron core (2) is slidably connected to the valve core tube (4); the static iron core (3) is fixed to the end of the valve core tube (4) away from the valve seat (1); a spring (5) is provided in the valve core tube (4); one end of the spring (5) abuts against the lower end of the static iron core (3), and the other end of the spring (5) abuts against the upper end of the moving iron core (2); a thread groove (6) is provided at the top of the static iron core (3); the static iron core (3) is connected to the external valve body through the thread groove (6); an external thread (7) is provided on the valve seat (1); the valve seat (1) is connected to the external valve body through the external thread (7).

2. A normally closed electromagnetic expansion valve core according to claim 1, characterized in that: The bottom surface of the static iron core (3) is provided with a truncated cone-shaped abutment groove (8) recessed upward, and the upper end of the movable iron core (2) is fixedly provided with a truncated cone-shaped abutment block (9), the abutment block (9) having the same shape as the abutment groove (8).

3. A normally closed electromagnetic expansion valve core according to claim 2, characterized in that: An upper clamping groove is provided at the center of the abutment groove (8) on the bottom surface of the static iron core (3), and a lower clamping groove is provided at the center of the abutment block (9) at the top end of the moving iron core (2). The two ends of the spring (5) are respectively clamped in the upper clamping groove and the lower clamping groove.

4. A normally closed electromagnetic expansion valve core according to claim 3, characterized in that: A vertical channel (10) is provided inside the moving iron core (2), the upper end of the channel (10) is connected to the lower slot, the diameter of the channel (10) is smaller than the diameter of the lower slot, the lower end of the channel (10) passes through the moving iron core (2) and is connected to the outside, and an annular slot is provided at the bottom of the moving iron core (2), and a gasket (11) is provided in the annular slot.

5. The normally closed electromagnetic expansion valve core according to claim 1, characterized in that: The lower end of the valve seat (1) is provided with a seat cavity (12), the lower end of the moving iron core (2) is located in the seat cavity (12), and the seat cavity (12) is used to place an external pagoda spring (5).

6. A normally closed electromagnetic expansion valve core according to claim 5, characterized in that: An O-ring (13) is sleeved on the valve seat (1), and the O-ring (13) is used to increase the sealing performance between the valve seat (1) and the external valve body.

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