Internal-leakage-free electronic expansion valve

Abstract

The utility model provides an internal-leakage-free electronic expansion valve which comprises a valve body, a plunger is arranged in the valve body, and a limiting groove is formed in the valve body; a valve rod is arranged at the lower end of the plunger; a coil is arranged on the valve body, a rotor corresponding to the coil is arranged in the valve body, and a liquid inlet and a liquid outlet are formed in the lower portion of the valve body. A working head is arranged at the lower end of the valve rod, a spring is arranged between the lower end of the working head and the inner wall of the valve body, and the working head is detachably installed on the valve rod. A sealing gasket is arranged on the upper end face of the working head, an auxiliary sealing plate is arranged on the lower side of the liquid passing opening, a hollowed-out part is reserved in the position, corresponding to the liquid passing opening, of the auxiliary sealing plate, and the hollowed-out part is larger than the liquid passing opening. The working head is arranged at the lower end of the valve rod, the sealing gasket is arranged on the working head, and the auxiliary sealing plate is arranged at the position, corresponding to the working head, of the liquid passing opening, so that when the valve is closed, the working head and the liquid passing opening can be effectively sealed, and internal leakage is avoided. Meanwhile, the plunger, the valve rod and the working head are all made of stainless steel materials and are durable and longer in service life.

Description

Technical Field

[0001] The invention belongs to the technical field of valves, and in particular relates to an electronic expansion valve without internal leakage. Background Art

[0002] An electronic expansion valve is a flow control valve that uses an actuator as an actuator to drive the movement of the valve core to open and close the valve. When the electronic expansion valve is closed, the actuator often continues to work for a period of time after the valve core contacts the valve seat before stopping, resulting in a large force between the valve core and the valve seat. This force will cause friction between the valve core and the valve seat. This friction requires the actuator to provide a sufficiently high starting torque to open the valve again. Otherwise, it will cause a stall or loss of step. In the prior art, some electronic expansion valves have internal leakage problems, resulting in reduced control accuracy. Therefore, it is necessary to improve the existing electronic expansion valve structure. Summary of the invention

[0003] In view of this, the present invention aims to overcome the defects in the prior art and proposes an electronic expansion valve without internal leakage.

[0004] To achieve the above object, the technical solution created by the present invention is implemented as follows:

[0005] A non-internal leakage electronic expansion valve comprises a valve body, a plunger is arranged in the valve body, a limit groove is arranged on the valve body corresponding to the lower part of the plunger; a valve stem is arranged at the lower end of the plunger; a coil is arranged on the valve body, a rotor is arranged in the valve body corresponding to the coil, and a liquid inlet and a liquid outlet are arranged at the lower part of the valve body; a working head for closing the liquid passage between the liquid inlet and the liquid outlet is arranged at the lower end of the valve stem, a spring is arranged between the lower end of the working head and the inner wall of the valve body, the diameter of the working head is larger than the diameter of the liquid passage, and the working head can be detachably mounted on the valve stem; a sealing gasket is arranged on the upper end surface of the working head, and an auxiliary sealing plate is arranged on the lower side of the liquid passage, and the auxiliary sealing plate is hollowed out at the corresponding liquid passage, and the hollowing out is larger than the liquid passage.

[0006] Furthermore, the working head is threadedly screwed onto the valve stem.

[0007] Furthermore, the sealing gasket is made of fluororubber.

[0008] Furthermore, the plunger, valve stem and working head are all made of stainless steel.

[0009] Furthermore, a baffle ring is provided on the inner wall of the liquid outlet, the lower end of the spring abuts against the baffle ring, and the upper end abuts against the lower surface of the working head.

[0010] Furthermore, the inner diameter of the baffle ring is greater than or equal to the diameter of the liquid port.

[0011] Furthermore, the auxiliary sealing plate is welded and fixed to the liquid outlet.

[0012] Furthermore, the outer wall of the liquid inlet and the outer wall of the liquid outlet are both provided with threaded connection parts.

[0013] Compared with the prior art, the present invention has the following advantages:

[0014] The invention provides a working head at the lower end of the valve stem, a sealing pad on the working head, and an auxiliary sealing plate at the liquid outlet corresponding to the working head, so that when the valve is closed, the working head and the liquid outlet can be effectively sealed to avoid internal leakage. At the same time, the plunger, valve stem and working head are all made of stainless steel, which is durable and has a longer service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0016] Figure 1 A schematic diagram of the structure created by the present invention;

[0017] Figure 2 It is a schematic diagram of the working head part in the invention;

[0018] Figure 3 for Figure 2 Schematic diagram of the valve stem section. DETAILED DESCRIPTION

[0019] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0021] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0022] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0023] An electronic expansion valve without internal leakage, such as Figures 1 to 3 As shown, it includes a valve body 1, a plunger 2 is arranged in the valve body, a limit groove 3 is arranged on the valve body corresponding to the lower part of the plunger; a valve stem 4 is arranged at the lower end of the plunger; a coil 5 is arranged on the valve body, a rotor 6 is arranged in the valve body corresponding to the coil, and a liquid inlet 7 and a liquid outlet 8 are arranged at the lower part of the valve body; a working head 9 for closing the liquid port between the liquid inlet and the liquid outlet is arranged at the lower end of the valve stem, and a spring 10 is arranged between the lower end of the working head and the inner wall of the valve body.

[0024] The diameter of the working head is larger than the diameter of the liquid outlet, and the working head can be detachably mounted on the valve stem; a sealing gasket 11 is provided on the upper end face of the working head, and an auxiliary sealing plate 12 is provided on the lower side of the liquid outlet, and the auxiliary sealing plate has a hollow 15 at the corresponding liquid outlet, and the hollow is larger than the liquid outlet.

[0025] The sealing gasket is made of fluororubber. When the valve stem drives the working head to close the liquid port, it can maintain reliable sealing and effectively avoid internal leakage. The connecting part 16 at the upper end of the working head is screwed on the valve stem, which is more convenient for installation and removal. The plunger, valve stem and working head are all made of stainless steel, which is durable and has a longer service life.

[0026] The inner wall of the liquid outlet is provided with a baffle ring 13, which serves as a support base for the valve stem installation. The lower end of the spring abuts against the baffle ring, and the upper end abuts against the lower surface of the working head. The spring is provided so that the valve stem is stably stressed and has good resilience. Usually, the inner diameter of the baffle ring is greater than or equal to the diameter of the liquid outlet. The auxiliary sealing plate is welded and fixed to the liquid outlet. To facilitate connection with external pipelines, the outer wall of the liquid inlet and the outer wall of the liquid outlet are both provided with a threaded connection part 14.

[0027] The invention provides a working head at the lower end of the valve stem, a sealing pad on the working head, and an auxiliary sealing plate at the liquid outlet corresponding to the working head, so that when the valve is closed, the working head and the liquid outlet can be effectively sealed to avoid internal leakage. At the same time, the plunger, valve stem and working head are all made of stainless steel, which is durable and has a longer service life.

[0028] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An electronic expansion valve without internal leakage, characterized in that: It includes a valve body, a plunger is arranged in the valve body, a limit groove is arranged on the valve body corresponding to the lower part of the plunger; a valve stem is arranged at the lower end of the plunger; a coil is arranged on the valve body, a rotor is arranged in the valve body corresponding to the coil, and a liquid inlet and a liquid outlet are arranged at the lower part of the valve body; a working head for closing the liquid passage between the liquid inlet and the liquid outlet is arranged at the lower end of the valve stem, a spring is arranged between the lower end of the working head and the inner wall of the valve body, the diameter of the working head is larger than the diameter of the liquid passage, and the working head can be detachably installed on the valve stem; a sealing gasket is arranged on the upper end surface of the working head, and an auxiliary sealing plate is arranged on the lower side of the liquid passage, and the auxiliary sealing plate is hollowed out at the corresponding liquid passage, and the hollowing out is larger than the liquid passage.

2. The electronic expansion valve without internal leakage according to claim 1, characterized in that: The working head is threadedly screwed onto the valve stem.

3. The electronic expansion valve without internal leakage according to claim 1, characterized in that: The sealing gasket is a fluororubber sealing gasket.

4. The electronic expansion valve without internal leakage according to claim 1, characterized in that: The plunger, valve stem and working head are all made of stainless steel.

5. The electronic expansion valve without internal leakage according to claim 1, characterized in that: A baffle ring is arranged in the liquid outlet, the lower end of the spring abuts against the baffle ring, and the upper end of the spring abuts against the lower surface of the working head.

6. The electronic expansion valve without internal leakage according to claim 5, characterized in that: The inner diameter of the baffle ring is greater than or equal to the diameter of the liquid outlet.

7. The electronic expansion valve without internal leakage according to claim 1, characterized in that: The auxiliary sealing plate is welded and fixed to the liquid outlet.

8. The electronic expansion valve without internal leakage according to claim 1, characterized in that: The outer wall of the liquid inlet and the outer wall of the liquid outlet are both provided with threaded connection parts.

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