Electronic expansion valve for automobile air conditioner
By setting up a valve inlet channel that is larger first and then smaller and a valve outlet channel that is smaller first and then larger in the electronic expansion valve, the two expansions of fluid are achieved, and the problems of low refrigeration efficiency and large energy loss in the prior art are solved, which improves the Refrigeration efficiency and fluid flow rate.
Patent Information
- Application Number
- CN202420904615.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-25
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-04-25
AI Technical Summary
Existing electronic expansion valves can only expand the fluid in one stage, resulting in low refrigeration efficiency and large energy loss at the expansion valve.
An electronic expansion valve for automotive air conditioners is designed. By setting the valve inlet passage as a structure with a large first and then small valve outlet passage as a structure with a small first and then large valve outlet passage as a small first and then large, the fluid expansion is achieved and the kinetic energy loss is reduced.
It effectively improves the refrigeration efficiency, reduces the energy loss at the electronic expansion valve, and improves the flow rate and temperature cooling effect of the fluid.
Smart Images
Figure CN222210858U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of automobile parts, in particular to an electronic expansion valve for automobile air conditioners. Background Art
[0002] In the field of refrigeration control systems, some control valves are used to accurately control the refrigerant flow, high speed, large load adjustment, etc., so that the refrigeration cycle can be kept in the best state and give full play to its throttling control advantages. Common throttling elements include thermal expansion valves, electronic expansion valves, etc. Electronic expansion valves are increasingly widely used in the refrigeration field due to their fast response speed and adjustment accuracy. However, the current electronic expansion valves can only perform primary expansion of the fluid, and the refrigeration efficiency is relatively low.
[0003] Therefore, there is an urgent need to develop an electronic expansion valve for automotive air conditioning, which can expand the fluid twice, improve the refrigeration efficiency, and reduce the energy loss caused at the electronic expansion valve. Summary of the invention
[0004] In view of this, the purpose of the utility model is to provide an electronic expansion valve for automobile air conditioning, which can expand the fluid twice, effectively improve the refrigeration efficiency, and also effectively reduce the energy loss caused at the electronic expansion valve.
[0005] The utility model discloses an electronic expansion valve for automobile air conditioner, comprising a valve body, wherein the valve body has a valve cavity, and a valve inlet channel and a valve outlet channel are arranged on the valve body in communication with the valve cavity, wherein the valve inlet channel is a structure that is large at first and small at last, and the valve outlet channel is a structure that is small at first and large at last, and the valve inlet channel and the valve outlet channel are in the same straight line; the structure of the valve inlet channel is set to be large at first and small at last, and the structure of the valve outlet channel is set to be small at first and large at last, and the fluid can be expanded twice in the process of flowing into the valve inlet channel and flowing out through the valve outlet channel, thereby improving the refrigeration efficiency and reducing the kinetic energy loss at the electronic expansion valve.
[0006] Furthermore, the valve inlet channel includes a first cavity segment I, a second cavity segment I and a third cavity segment I which are connected in sequence, the first cavity segment I is a cylindrical structure, the second cavity segment I is a conical structure which tapers forward, the third cavity segment I is a capillary structure, and the third cavity segment I is connected to the valve cavity; the structure of the valve inlet channel is arranged to be large at first and small at the end, which can throttle the fluid when it flows through, and at the same time can make the fluid have a larger flow rate when passing through the third cavity segment I, thereby reducing the fluid temperature.
[0007] Furthermore, the valve outlet channel includes a first cavity segment II, a second cavity segment II and a third cavity segment II which are connected in sequence, the first cavity segment II is a capillary structure, the second cavity segment II is a conical structure which gradually expands forward, the third cavity segment II is a cylindrical structure, and the first cavity segment II is connected to the valve cavity; the structure of the valve outlet channel is set to be small at first and then large, so that the fluid has a larger flow rate when entering the second cavity segment II and the third cavity segment II, and the fluid can be throttled twice.
[0008] Furthermore, the bottom of the valve cavity is a tapered structure that tapers forward. By setting the bottom of the valve cavity to be a tapered structure that tapers forward, it is easier to control the flow rate passing through the valve cavity.
[0009] Furthermore, one side of the inlet of the first cavity segment II is set corresponding to the tip of the conical structure, and the other side is set corresponding to the lower position of the conical surface of the conical structure; setting one side of the inlet of the first cavity segment II corresponding to the tip of the conical structure can reduce the resistance encountered by the fluid from the valve inlet channel to the valve outlet channel when the valve body is in an open state.
[0010] Furthermore, it also includes a valve core arranged in the valve cavity, and the valve core can be driven to move up and down along the central axis of the valve body. The valve core is provided with a sealing surface adapted to the conical structure; the opening and closing of the valve body is controlled by the movement of the valve core, so as to facilitate the adjustment of the fluid flow passing therethrough.
[0011] Furthermore, a lead screw is provided in the valve cavity and cooperates with the valve core thread to drive the valve core to move reciprocally up and down, so that the lead screw can drive the valve core to move up and down axially to approach or move away from the conical structure; a nut part is provided on the top of the valve core, and the thread cooperation of the nut and the lead screw facilitates the control of the movement of the valve core, and the overall structure is simple.
[0012] Furthermore, a limiting mechanism is provided in the valve cavity for limiting the circumferential rotation of the valve core relative to the valve cavity; the limiting mechanism is provided to limit the circumferential rotation of the valve core relative to the valve cavity, so that the valve core can reciprocate up and down along the axial direction of the valve cavity.
[0013] Furthermore, it also includes a driving mechanism for driving the valve core to move back and forth up and down, the driving mechanism includes a stator and a rotor, the stator is fixedly arranged, and the rotor is matched with the lead screw transmission; the driving mechanism is arranged to drive the valve core to move up and down, and the driving mechanism is arranged at the top of the lead screw, so that the overall structure is compact.
[0014] Furthermore, it also includes a controller, which is used to control the magnitude and time of the stator's power-on current; the controller controls the magnitude and time of the stator's power-on current, thereby controlling the movement of the valve core, making the overall control more precise.
[0015] Beneficial effects of the utility model: The utility model is an electronic expansion valve for automobile air conditioning, which can expand the fluid twice by setting the valve inlet channel of the electronic expansion valve to a structure that is first large and then small and setting the valve outlet channel to a structure that is first small and then large, thereby improving the refrigeration efficiency and reducing the kinetic energy loss at the electronic expansion valve. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The utility model is further described below in conjunction with the accompanying drawings and embodiments:
[0017] Figure 1 It is a structural schematic diagram of the utility model;
[0018] The above drawings contain the following reference numerals:
[0019] 1. Valve body; 101. Groove; 102. First cavity section II; 103. Second cavity section II; 104. Third cavity section II; 105. Conical structure; 106; Third cavity section I; 107. Second cavity section I; 108. First cavity section I; 109. Limiting mechanism; 2. Valve core; 3. Screw; 4. Stator; 5. Rotor; 6. Valve cavity. DETAILED DESCRIPTION
[0020] Figure 1 The schematic diagram of the structure of the utility model is shown in the figure: an electronic expansion valve for automobile air conditioning in the present embodiment comprises a valve body 1, wherein the valve body 1 has a valve cavity 6, and a valve inlet channel and a valve outlet channel are arranged on the valve body 1 in communication with the valve cavity 6, wherein the valve inlet channel is a structure that is large at first and small at last, and the valve outlet channel is a structure that is small at first and large at last, and the valve inlet channel and the valve outlet channel are in the same straight line; in the present structure, the valve body 1 comprises an upper valve body and a lower valve body, wherein the upper valve body and the lower valve body are fixedly connected, the valve cavity 6 is arranged on the lower valve body, and the valve inlet channel and the valve outlet channel are arranged on the lower valve body, wherein the valve inlet channel and the valve outlet channel are arranged on the same straight line; The channels are arranged on the same straight line. When the structures of the valve inlet channel and the valve outlet channel are cylindrical, the valve inlet channel and the valve outlet channel are coaxially arranged. When the structures of the valve inlet channel and the valve outlet channel are square, the valve inlet channel and the valve outlet channel are arranged on the same center line. This can reduce the flow resistance of the fluid when it flows through, thereby reducing the kinetic energy loss caused at the electronic expansion valve. At the same time, by setting the valve inlet channel of the electronic expansion valve to a structure that is first large and then small and setting the valve outlet channel to a structure that is first small and then large, the fluid can be expanded twice, thereby improving the refrigeration efficiency.
[0021] In the prior art, in the field of refrigeration control systems, some control valves are used to accurately control the refrigerant flow, high speed, large load adjustment and other requirements, so that the refrigeration cycle can be kept in the best state and give full play to its throttling control advantages. Common throttling elements include thermal expansion valves, electronic expansion valves, etc. Electronic expansion valves are increasingly widely used in the field of refrigeration due to their advantages such as fast response speed and adjustment accuracy. However, the current electronic expansion valves can only perform primary expansion of the fluid, and the refrigeration efficiency is relatively low. The utility model can perform secondary expansion of the fluid flowing through by setting the valve inlet channel of the electronic expansion valve to a structure of large first and small later and setting the valve outlet channel to a structure of small first and large later, thereby improving the refrigeration efficiency.
[0022] In this embodiment, the valve inlet channel includes a first cavity segment Ⅰ108, a second cavity segment Ⅰ107 and a third cavity segment Ⅰ106 which are connected in sequence. The first cavity segment Ⅰ108 is a cylindrical structure, the second cavity segment Ⅰ107 is a conical structure which tapers forward, and the third cavity segment Ⅰ106 is a capillary structure. The third cavity segment Ⅰ106 is connected to the valve cavity 6. The diameter (width) of the first cavity segment Ⅰ108 is greater than that of the third cavity segment Ⅰ106. By improving the structure of the valve inlet channel, the channel structure space is first large and then small, so that the inflowing fluid can be throttled. At the same time, due to the Bernoulli principle, the fluid entering the valve cavity 6 from the third cavity segment Ⅰ106 has a faster flow rate, so that the pressure of the fluid is reduced and the temperature is lower.
[0023] In this embodiment, the valve outlet channel includes a first cavity segment Ⅱ102, a second cavity segment Ⅱ103 and a third cavity segment Ⅱ104 which are connected in sequence. The first cavity segment Ⅱ102 is a thin tube structure, the second cavity segment Ⅱ103 is a conical structure which gradually expands forward, and the third cavity segment Ⅱ104 is a cylindrical structure. The first cavity segment Ⅱ102 is connected to the valve cavity 6; the diameter of the first cavity segment Ⅱ102 is smaller than the diameter of the third cavity segment Ⅱ104, and the diameter of the first cavity segment Ⅱ102 can be consistent with the diameter of the third cavity segment Ⅰ104. By setting the channel space of the valve outlet channel to be small at first and then large, the passing fluid can be throttled for the second time, and the pressure and temperature of the fluid can be reduced again, thereby realizing the effect of expansion and cooling, and improving the expansion cooling capacity.
[0024] In this embodiment, the bottom of the valve cavity 6 is a conical structure 105 that tapers forward; the bottom is one end close to the valve inlet channel (the lower part in the up and down direction shown in the figure), and the end of the conical structure 105 close to the valve outlet channel is the tip of the conical structure 105. By setting the bottom of the valve cavity 6 to the conical structure 105, it is convenient to control the valve flow of the valve body 1.
[0025] In this embodiment, one side of the inlet of the first cavity segment II 102 is set corresponding to the tip of the conical structure 105, and the other side is set corresponding to the lower position of the conical surface of the conical structure 105; the first cavity segment II 102 is tilted relative to the axis of the valve body 1, and by setting one side of the inlet of the first cavity segment II 102 corresponding to the front end of the conical structure 105 (one side of the inlet of the first cavity segment II 102 coincides with or is close to the extension line of one side of the end point of the conical structure 105), the fluid entering from the valve inlet channel can enter the valve outlet channel in a straight line, thereby reducing energy loss.
[0026] In this embodiment, it also includes a valve core 2 arranged in the valve cavity 6. The valve core 2 can be driven to move up and down along the central axis of the valve body 1. The valve core 2 is provided with a sealing surface adapted to the conical structure 105. In this structure, up and down are the up and down directions shown in the figure. The valve core 2 can be driven to move up and down along the central axis of the valve body 1, so as to facilitate the adjustment of the flow of the valve body 1. At the same time, a sealing surface is provided on the valve core 2 to facilitate the cooperation with the conical structure 105 to adjust the flow of the valve body.
[0027] In this embodiment, a lead screw 3 is provided in the valve chamber 6 and is threadedly matched with the valve core 2 for driving the valve core 2 to move back and forth up and down, so that the lead screw 3 can drive the valve core 2 to move up and down axially to approach or move away from the conical structure 105; in this structure, when the valve core 2 approaches the conical structure 105, in order to close the valve body 1, a nut portion is provided on the top of the valve core 2, and the nut portion and the lead screw 3 are threadedly matched, and the rotational movement of the lead screw 3 is controlled (by controlling the forward or reverse rotation of the lead screw), thereby driving the valve core 2 to move back and forth up and down.
[0028] In this embodiment, a limiting mechanism 109 is provided in the valve cavity 6 for limiting the circumferential rotation of the valve core 2 relative to the valve cavity 6; in this structure, a vertical groove 101 is provided in the valve cavity 6 for cooperating with the limiting mechanism 209. Through the cooperation between the groove 101 and the limiting mechanism 109, the valve core 2 does not rotate circumferentially. The structure of the limiting mechanism 109 is also thought to be a protrusion provided on the nut part, or a limiting pin is provided on the cavity wall of the valve cavity 6, and a groove and other cooperating structures are provided on the nut part.
[0029] In this embodiment, it also includes a driving mechanism for driving the valve core 2 to move reciprocally up and down, and the driving mechanism includes a stator 4 and a rotor 5. The stator 4 is fixedly arranged, and the rotor 5 is in transmission cooperation with the lead screw 3; the stator 4 is a coil that can be energized, and the rotor 5 is a rotor magnetic ring, which is a prior art and will not be repeated here. The driving mechanism is arranged on the upper valve body of the valve body 1, and a part of the lead screw 3 is located in the upper valve body, and the other part is located in the lower valve body. By controlling whether the stator 4 is energized or not, the movement of the lead screw 3 is controlled by electromagnetic action, so that the lead screw 3 can be driven to rotate, and the control is more precise.
[0030] In this embodiment, a controller is also included, and the controller is used to control the current and time of the stator 4. The structure of the controller is an application of existing technology, generally including a control unit and peripheral circuits, such as a CPU or an existing controller on a car air conditioner, or an ECU of a car, which will not be described here. The controller controls whether the stator 4 is energized or not, and combines with the rotor magnetic ring to make the screw 3 rotate under the electromagnetic action, thereby controlling the movement of the valve core 2.
[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.
Claims
1. An electronic expansion valve for automobile air conditioning, characterized in that: It includes a valve body, which has a valve cavity. A valve inlet channel and a valve outlet channel are arranged on the valve body and are connected to the valve cavity. The valve inlet channel is a structure that is first large and then small, and the valve outlet channel is a structure that is first small and then large. The valve inlet channel and the valve outlet channel are in the same straight line.
2. The electronic expansion valve for automobile air conditioning according to claim 1, characterized in that: The valve inlet channel includes a first cavity segment I, a second cavity segment I and a third cavity segment I which are connected in sequence, the first cavity segment I is a cylindrical structure, the second cavity segment I is a conical structure which tapers forward, the third cavity segment I is a capillary structure, and the third cavity segment I is connected to the valve cavity.
3. The electronic expansion valve for automobile air conditioning according to claim 1, characterized in that: The valve outlet channel includes a first cavity segment II, a second cavity segment II and a third cavity segment II which are connected in sequence, the first cavity segment II is a thin tube structure, the second cavity segment II is a conical structure which gradually expands forward, the third cavity segment II is a columnar structure, and the first cavity segment II is connected to the valve cavity.
4. The electronic expansion valve for automobile air conditioning according to claim 3, characterized in that: The bottom of the valve cavity is a conical structure that tapers forward.
5. The electronic expansion valve for automobile air conditioning according to claim 4, characterized in that: One side of the entrance of the first cavity section II is arranged corresponding to the tip of the conical structure, and the other side is arranged corresponding to the lower part of the conical surface of the conical structure.
6. The electronic expansion valve for automobile air conditioning according to claim 4, characterized in that: It also includes a valve core arranged in the valve cavity. The valve core can be driven to move up and down along the central axis of the valve body. The valve core is provided with a sealing surface adapted to the conical structure.
7. The electronic expansion valve for automobile air conditioning according to claim 6, characterized in that: A lead screw is arranged in the valve cavity and cooperates with the valve core thread to drive the valve core to move up and down reciprocatingly, so that the lead screw can drive the valve core to move up and down along the axial direction to approach or move away from the conical structure.
8. The electronic expansion valve for automobile air conditioning according to claim 6, characterized in that: A limiting mechanism is arranged in the valve cavity for limiting the circumferential rotation of the valve core relative to the valve cavity.
9. The electronic expansion valve for automobile air conditioning according to claim 7, characterized in that: It also includes a driving mechanism for driving the valve core to move up and down reciprocatingly, and the driving mechanism includes a stator and a rotor, the stator is fixedly arranged, and the rotor is matched with the lead screw transmission.
10. The electronic expansion valve for automobile air conditioning according to claim 9, characterized in that: It also includes a controller, which is used to control the magnitude and time of the current flowing through the stator.