Valve body structure and electromagnetic drive type electronic expansion valve

Abstract

The utility model discloses a valve body structure and an electromagnetic drive type electronic expansion valve, and belongs to the technical field of automobile air conditioners, the valve body structure comprises a fixed iron core, a valve body capable of being in butt joint with the fixed iron core and a valve element capable of being movably arranged on the valve body in a penetrating mode, and the valve body comprises an upper valve body capable of being in butt joint with the fixed iron core and a lower valve body capable of being in butt joint with the upper valve body; wherein a first valve cavity is defined between the upper valve body and the lower valve body, a second valve cavity is defined between the fixed iron core and the upper valve body, and the lower valve body is provided with an inlet channel and an outlet channel which are communicated with the first valve cavity; the valve element is movably arranged on the upper valve body in a penetrating mode, a valve port is defined by one end of the valve element and the inlet channel, and a supporting spring capable of driving one end of the valve element to be away from the valve port is arranged in the second valve cavity. According to the valve body structure and the electromagnetic drive type electronic expansion valve, the problem that protection cannot be provided when an air conditioning system is abnormal in the prior art is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobile air conditioners, and in particular relates to a valve body structure and an electromagnetically driven electronic expansion valve. Background Art

[0002] The electronic expansion valve is a throttling element that can control the flow of refrigerant entering the refrigeration device according to a preset program. It is widely used in some air-conditioning systems. With the continuous development of automotive air-conditioning technology, the requirements for refrigeration efficiency and accuracy are increasing.

[0003] In order to control the valve opening of the electronic expansion valve, the utility model patent with publication number CN220669838U proposes an electromagnetically driven electronic expansion valve with signal feedback. The sensor circuit control board component senses the displacement magnetic field change caused by the movement of the permanent magnet, thereby measuring the valve opening change and being able to feed back the developed opening change to the air-conditioning system so that the air-conditioning system can detect the working status of the electronic expansion valve in real time.

[0004] According to the electromagnetically driven electronic expansion valve with signal feedback disclosed in the above patent, it is more dependent on the remote control of the air-conditioning system and cannot handle the error of the valve opening according to the actual situation; at the same time, when the air-conditioning system operates abnormally, the electronic expansion valve will quickly close the valve after power failure, causing the system pressure to increase abnormally and suffer shock. Utility Model Content

[0005] The utility model aims to overcome the deficiencies in the prior art and to provide a valve body structure and an electromagnetically driven electronic expansion valve to solve the problem in the prior art that protection cannot be provided when an abnormality occurs in the air conditioning system.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a valve body structure, including a fixed iron core, a valve body capable of docking with the fixed iron core, and a valve core capable of being movably arranged on the valve body, wherein the valve body includes an upper valve body capable of docking with the fixed iron core, and a lower valve body capable of docking with the upper valve body;

[0007] A first valve cavity is formed between the upper valve body and the lower valve body, a second valve cavity is formed between the fixed iron core and the upper valve body, and the lower valve body is provided with an inlet channel and an outlet channel respectively connected to the first valve cavity;

[0008] The valve core is movably arranged on the upper valve body, and a valve port is formed between one end of the valve core and the inlet channel. A supporting spring capable of driving one end of the valve core away from the valve port is arranged in the second valve cavity.

[0009] Optionally, an air guide channel is provided at one end of the valve core facing the inlet channel, and two ends of the air guide channel are respectively connected to the first valve cavity and the second valve cavity.

[0010] Optionally, the inlet channel comprises a first section and a second section which are perpendicular to each other and connected, and the second section is coaxially arranged with the central axis of the lower valve body;

[0011] The outlet channel is staggered with the first section and the second section, and the central axis of the outlet channel is parallel to the central axis of the lower valve body.

[0012] Optionally, the valve core is coaxially arranged with the second section on the inlet channel, and an edge of one end of the valve core facing the second section is provided with a rounded corner, and an edge of one end of the second section facing the valve core is provided with a chamfer.

[0013] Optionally, an O-ring is embedded in the upper valve body and can be sleeved on the outer periphery of the valve core.

[0014] An electromagnetically driven electronic expansion valve, comprising the valve body structure as described in any one of the above, a control circuit board assembly and a driving unit capable of driving the valve core to move toward an inlet channel, the driving unit comprising a valve stem coaxially arranged with the fixed iron core, a moving iron core and an electromagnetic module capable of driving the moving iron core to abut against the valve core;

[0015] The valve stem is inserted into the fixed iron core, and one end of the valve stem can abut against the valve core;

[0016] One end of the moving iron core is movably embedded in the fixed iron core, a fixing seat is arranged on the moving iron core, a permanent magnet is arranged on the fixing seat, and the control circuit board assembly can detect the change of the magnetic field around the permanent magnet.

[0017] Optionally, a sealing cover is provided on the outer periphery of the moving iron core and the fixing seat, and a limit spring capable of elastically abutting against the sealing cover is provided on the fixing seat, and the limit spring is coaxially arranged with the support spring.

[0018] Optionally, a shell is provided around the electromagnetic module and the control circuit board assembly, and a mounting bracket and a junction box assembly are provided on the shell.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] (1) The valve body adopts a split structure. Since the upper valve body and the lower valve body are composed, after the upper valve body, the lower valve body and the fixed iron core are assembled, the first valve cavity and the second valve cavity can be formed. The support spring placed in the second valve cavity can drive one end of the valve core away from the inlet channel and the outlet channel connected to the first valve cavity without the influence of external force, so that the inlet channel and the outlet channel remain unobstructed. Therefore, when an abnormal situation occurs, such as power failure or line interruption, it can quickly return to the initial state, ensuring that the valve port is fully opened to release the pressure in the pipeline and protect the system from impact;

[0021] (2) By controlling the circuit board assembly to sense the permanent magnet that moves synchronously with the moving iron core, the valve opening change is measured according to the change in the magnetic field around the permanent magnet. At the same time, the corresponding current intensity can be adjusted according to the error of the valve opening to correct the valve opening so that it meets the high-precision valve opening requirement. When applied to the air-conditioning system, the control logic of the air-conditioning system can also be simplified to reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0023] Figure 1 It is a schematic diagram of the top view of the electromagnetically driven electronic expansion valve in the preferred embodiment of the utility model;

[0024] Figure 2 In the preferred embodiment of the utility model Figure 1 Schematic diagram of the cross-sectional structure at AA;

[0025] Figure 3 In the preferred embodiment of the utility model Figure 2 Schematic diagram of the cross-sectional structure at BB;

[0026] Among them, 1. fixed iron core; 21. upper valve body; 22. lower valve body; 221. inlet channel; 2211. first section; 2212. second section; 222. outlet channel; 3. valve core; 301. air guide channel; 4. first valve chamber; 5. second valve chamber; 6. support spring; 7. O-ring; 8. control circuit board assembly; 9. valve stem; 10. moving iron core; 11. electromagnetic module; 12. fixing seat; 13. permanent magnet; 14. sealing cover; 15. limit spring; 16. shell; 17. mounting bracket; 18. junction box assembly. DETAILED DESCRIPTION

[0027] The present invention will now be further described in detail in conjunction with the accompanying drawings and embodiments. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0028] It should be noted that if there are directional indications (such as up, down, bottom, top, etc.) involved in this embodiment, the directional indication is only used to explain the relative position relationship, movement, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly. The terms "first" and "second" 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. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. Unless otherwise clearly specified and defined, the terms "set", "connected", and "connected" 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 directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances. Embodiment 1

[0029] like Figure 1-Figure 3 As shown, a valve body structure includes a fixed iron core 1, a valve body capable of docking with the fixed iron core 1, and a valve core 3 capable of being movably arranged on the valve body. The valve body includes an upper valve body 21 capable of docking with the fixed iron core 1, and a lower valve body 22 capable of docking with the upper valve body 21. The valve body adopts a split structure, which is beneficial to reducing the process of processing channels on the valve body;

[0030] The upper valve body 21 and the lower valve body 22 can be sealed by a rubber ring. A first valve cavity 4 is formed between the upper valve body 21 and the lower valve body 22, and a second valve cavity 5 is formed between the fixed iron core 1 and the upper valve body 21. The lower valve body 22 is provided with an inlet channel 221 and an outlet channel 222 respectively connected to the first valve cavity 4. The gas enters the first valve cavity 4 through the inlet channel and can then be discharged through the outlet channel 222.

[0031] Specifically, the valve core 3 is movably arranged on the upper valve body 21, and a valve port is formed between one end of the valve core 3 and the inlet channel 221, and a support spring 6 capable of driving one end of the valve core 3 away from the valve port is arranged in the second valve chamber 5; in the absence of external force, the support spring 6 can drive the valve core 3 in a direction away from the valve port, causing the valve port to open, so that the inlet channel 221 and the outlet channel 222 remain unobstructed, so that when an abnormal situation occurs, such as power failure or line interruption, it can quickly return to the initial state, ensuring that the valve port is fully opened to release the pressure in the pipeline, and protecting the system from impact.

[0032] As described above, the external force acts on the valve core 3 along the axis of the valve core 3, and after the external force offsets the elastic support force of the support spring 6, one end of the valve core 3 can be driven to move toward the inlet channel 221, thereby achieving the effect of controlling the valve opening.

[0033] The above, such as Figure 2 As shown, an air guide channel 301 is provided at one end of the valve core 3 facing the inlet channel 221, and the two ends of the air guide channel 301 are respectively connected to the first valve chamber 4 and the second valve chamber 5. The two ends of the valve core 3 are respectively located in the first valve chamber 4 and the second valve chamber 5. After the gas enters the first valve chamber 4 through the inlet channel 221, it will exert a certain force on one end of the valve core 3. The air guide channel 301 is added to connect the first valve chamber 4 and the second valve chamber 5, and the gas can apply an opposite and equal force to the other end of the valve core 3. The purpose is to keep the pressure generated by the gas at both ends of the valve core 3 the same and offset each other, so that the valve core 3 is only affected by the spring force at this time.

[0034] The above, such as Figure 2 , Figure 3 As shown, the inlet channel 221 includes a first section 2211 and a second section 2212 which are perpendicular and connected to each other. The second section 2212 is coaxially arranged with the central axis of the lower valve body 22. Specifically, the inlet channel 221 is in a "cross" shape; the outlet channel 222 is staggered with the first section 2211 and the second section 2212, and the central axis of the outlet channel 222 is parallel to the central axis of the lower valve body 22.

[0035] In this embodiment, the valve core 3 is coaxially arranged with the second section 2212 on the inlet channel 221, and the edge of one end of the valve core 3 facing the second section 2212 is provided with a rounded corner, and the edge of one end of the second section 2212 facing the valve core 3 is provided with a chamfer. The edge of the end with the rounded corner on the valve core 3 can abut against the end surface with the chamfer on the inlet channel 221, that is, a line seal is formed between one end of the valve core 3 and the inlet channel 221, in which the valve port is in contact with the taper and the rounded corner, thereby causing the relationship between the taper size of the valve core 3 and the gas flow rate to form a curve, so as to accurately control the valve port opening.

[0036] like Figure 2 As shown, an O-ring 7 that can be sleeved on the outer periphery of the valve core 3 is embedded in the upper valve body 21 to prevent impurities in the refrigerant from entering the gap between the valve core 3 and the upper valve body 21 and causing a risk of sticking. Embodiment 2

[0037] like Figure 1-Figure 3As shown, on the basis of the first embodiment, an electromagnetically driven electronic expansion valve is implemented by adopting the aforementioned valve body structure, including the aforementioned valve body structure, a control circuit board assembly 8 and a driving unit capable of driving the valve core 3 to move toward the inlet channel 221, the driving unit comprising a valve stem 9 coaxially arranged with the fixed iron core 1, a moving iron core 10 and an electromagnetic module 11 capable of driving the moving iron core 10 to abut against the valve core 3; the electromagnetic module 11 is an electromagnetic coil commonly used in the prior art, which is arranged around the outer periphery of the moving iron core 10, and the moving iron core 10 and the valve stem 9 can move synchronously. Since the valve stem 9 is penetrated on the fixed iron core 1, and one end thereof can abut against the valve core 3. After the electromagnetic coil is energized, the moving iron core 10 moves toward the valve core 3 and is pushed toward the inlet channel 221 by the valve stem 9. The current intensity of the electromagnetic coil determines the magnitude of the electromagnetic force and the displacement of the valve core 3, thereby achieving the effect of controlling the valve port opening, ensuring the stability of the valve port output flow of the electronic expansion valve under the set current;

[0038] The above, such as Figure 2 As shown, one end of the moving iron core 10 is movably embedded in the fixed iron core 1, and a fixing seat 12 is provided on the moving iron core 10, and a permanent magnet 13 is provided on the fixing seat 12, and the control circuit board assembly 8 can detect the change in the magnetic field around the permanent magnet 13. The permanent magnet 13, the fixing seat 12, the moving iron core 10, and the valve stem 9 move synchronously, and the displacement of the moving iron core 10 will cause the magnetic field strength between the permanent magnet 13 and the control circuit board assembly 8 to change. In this technical solution, the control circuit board assembly 8 is a collection of various electronic components in the prior art, including a control chip, a transformer, a sensor, a dual-channel amplifier, an adjustable potentiometer, a capacitor, etc. The change in the magnetic field can be calculated by the electronic components in the prior art such as the control chip, and can be compared with the displacement set by the valve core 3, and the fine adjustment of the moving iron core 10 and the valve stem 9 can be achieved by appropriately adjusting the output current, that is, the valve opening required by the air conditioning system can be accurately achieved. The electromagnetically driven electronic expansion valve in the technical solution is designed to receive the valve opening instruction issued by the air conditioning system and convert it into a current signal for controlling the action of the valve core 3 to realize the opening and closing of the valve. At the same time, by controlling the magnetic field change of the moving iron core 10 displacement induced by the control circuit board assembly 8, the valve opening is compared with the air conditioning system instruction by the electrical signal and corrected, so as to realize the precise closed-loop control of the valve opening of the electromagnetically driven electronic expansion valve, and realize the role of feedback of the signal of the actual state of the electromagnetically driven electronic expansion valve to the air conditioning system.

[0039] The above, such as Figure 2As shown, a sealing cover 14 is provided on the outer periphery of the moving iron core 10, and a fixing seat 12 with one end embedded in the moving iron core 10 is provided inside the sealing cover 14, and a limit spring 15 which can elastically abut against the sealing cover 14 is provided on the fixing seat 12, and the limit spring 15 is coaxially arranged with the support spring 6. In the absence of external force, the limit spring 15 can drive the moving iron core 10 and the valve stem 9 to move toward the valve core 3 through the fixing seat 12, that is, the limit spring 15 acting on the fixing seat 12 and the support spring 6 acting on the valve core 3 can be combined to form a stable elastic structure to maintain the normal operation of the electronic expansion valve.

[0040] Further, such as Figure 2 As shown, a shell 16 is provided on the outer periphery of the electromagnetic module 11 and the control circuit board assembly 8, and a mounting bracket 17 and a junction box assembly 18 are provided on the shell 16. The control circuit board assembly 8 is integrated inside the shell 16 to form a whole with the valve body structure, etc. The opening of the valve port can be accurately controlled by only outputting a setting signal externally and providing energy.

[0041] Working principle: The magnetically driven electronic expansion valve is composed of an electromagnetic module 11, a valve body, a control circuit board assembly 8, a valve core 3, a valve stem 9, a valve core 3, a fixed iron core 1 and other structures; there is a second valve chamber 5 between the upper valve body 21 and the fixed iron core 1; there is also a first valve chamber 4 between the upper valve body 21 and the lower valve body 22; the two valve chambers can be isolated from each other by an O-ring 7, and can only be connected through an air guide channel 301; when the magnetically driven electronic expansion valve is electrically connected to the air-conditioning system, it can receive the valve opening command signal of the air-conditioning system, and the control circuit board assembly 8 can convert the valve opening command signal into the current signal required by the magnetically driven electronic expansion valve, and the electromagnetic module After receiving the current, block 11 generates electromagnetic force, and the magnitude of the electromagnetic force is proportional to the strength of the current signal; the electromagnetic force can push the moving iron core 10 to move toward the valve core 3, and the valve stem 9 installed and fixed in the middle of the moving iron core 10 moves synchronously. One end of the valve stem 9 is in contact with the valve core 3, and the support spring 6 sleeved on the outer periphery of the valve core 3 can prevent the valve stem 9 from moving. After the magnitude of the electromagnetic force is balanced with the reaction force of the support spring 6, it will drive the valve core 3 to move a certain distance toward the inlet channel 221, thereby changing the area of ​​the valve port channel; the air-conditioning refrigerant (gas) enters the first valve chamber 4 from the first horizontal section 2211 of the inlet channel 221, and then flows out through the outlet channel 222. The air guide channel 301 arranged in the middle of the valve core 3 can keep the pressures generated by the gas at both ends of the valve core 3 offset each other, so that the valve core 3 is only affected by the electromagnetic force and the spring force; and when the permanent magnet arranged at the upper end of the fixed seat 12 is displaced with the movement of the moving iron core 10, the control circuit board assembly 8 can sense the change in magnetic field strength according to the position change of the permanent magnet 13 and perform identification processing, and can also adjust the current size according to the displacement error, so as to accurately control the opening amount of the valve port to meet the system's requirements for the outlet flow of the electronic expansion valve. And when there is a problem with the air conditioning system, the electromagnetically driven electronic expansion valve in this technical solution can keep the inlet channel 221 and the outlet channel 222 unobstructed, can quickly release the pressure, and ensure its safety.

[0042] The above is based on the ideal embodiment of the utility model. Through the above description, relevant personnel can make various changes and modifications without deviating from the technical concept of the utility model. The technical scope of this utility model is not limited to the content in the specification, and the technical scope must be determined according to the scope of the claims.

Claims

1. A valve body structure, comprising a fixed iron core (1), a valve body capable of docking with the fixed iron core (1), and a valve core (3) capable of being movably arranged on the valve body, characterized in that: The valve body comprises an upper valve body (21) capable of docking with the fixed iron core (1), and a lower valve body (22) capable of docking with the upper valve body (21); A first valve cavity (4) is formed between the upper valve body (21) and the lower valve body (22), a second valve cavity (5) is formed between the fixed iron core (1) and the upper valve body (21), and the lower valve body (22) is provided with an inlet channel (221) and an outlet channel (222) which are respectively connected to the first valve cavity (4); The valve core (3) is movably mounted on the upper valve body (21), and a valve port is formed between one end of the valve core (3) and the inlet channel (221), and a support spring (6) capable of driving one end of the valve core (3) away from the valve port is arranged in the second valve cavity (5).

2. The valve body structure according to claim 1, characterized in that: An air guide channel (301) is provided at one end of the valve core (3) facing the inlet channel (221), and two ends of the air guide channel (301) are respectively connected to the first valve cavity (4) and the second valve cavity (5).

3. The valve body structure according to claim 1, characterized in that: The inlet channel (221) comprises a first section (2211) and a second section (2212) which are perpendicular to each other and communicate with each other, and the second section (2212) is coaxially arranged with the central axis of the lower valve body (22); The outlet channel (222) is staggered with the first section (2211) and the second section (2212), and the central axis of the outlet channel (222) is parallel to the central axis of the lower valve body (22).

4. The valve body structure according to claim 3, characterized in that: The valve core (3) is coaxially arranged with the second section (2212) on the inlet channel (221), and an edge of one end of the valve core (3) facing the second section (2212) is provided with a rounded corner, and an edge of one end of the second section (2212) facing the valve core (3) is provided with a chamfer.

5. The valve body structure according to claim 1, characterized in that: An O-type sealing ring (7) capable of being sleeved on the outer circumference of the valve core (3) is embedded in the upper valve body (21).

6. An electromagnetically driven electronic expansion valve, characterized in that: Comprising the valve body structure according to any one of claims 1 to 5, a control circuit board assembly (8), and a driving unit capable of driving the valve core (3) to move toward an inlet channel (221), the driving unit comprising a valve stem (9) coaxially arranged with the fixed iron core (1), a moving iron core (10), and an electromagnetic module (11) capable of driving the moving iron core (10) to abut against the valve core (3); The valve stem (9) is inserted into the fixed iron core (1), and one end of the valve stem is capable of abutting against the valve core (3); One end of the moving iron core (10) is movably embedded in the fixed iron core (1), a fixing seat (12) is provided on the moving iron core (10), a permanent magnet (13) is provided on the fixing seat (12), and the control circuit board assembly (8) is capable of detecting the change in the magnetic field around the permanent magnet (13).

7. The electromagnetically driven electronic expansion valve according to claim 6, characterized in that: The outer peripheries of the moving iron core (10) and the fixing seat (12) are provided with a sealing cover (14); the fixing seat (12) is provided with a limit spring (15) capable of elastically abutting against the sealing cover (14); and the limit spring (15) is coaxially arranged with the support spring (6).

8. The electromagnetically driven electronic expansion valve according to claim 6, characterized in that: The electromagnetic module (11) and the control circuit board assembly (8) are sheathed with a housing (16), and a mounting bracket (17) and a junction box assembly (18) are provided on the housing (16).

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