Electronic expansion valve for air conditioner

Abstract

The utility model discloses an electronic expansion valve for an air conditioner, which comprises a valve body, a valve core, a lead screw, an elastic piece, a valve rod, a valve rod, a valve rod, a valve rod, a valve rod, a valve rod, a valve rod, a valve rod, a valve rod, a valve rod, a valve rod, a valve rod, a valve rod, a valve rod, a valve rod and a valve rod, wherein the valve rod is arranged in the valve cavity and can be driven to move up and down along the central axis of the valve body; the guide rail is correspondingly arranged at the upper part of the lead screw; the elastic piece is arranged in the valve body, the buffering effect can be achieved, the situation that when the electronic expansion valve is started, the lead screw axially displaces to impact the valve body, large operation noise is generated is reduced, and meanwhile the service life can be prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigeration systems, in particular to an electronic expansion valve for air conditioners. Background Art

[0002] In the fields 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 refrigeration field due to their fast response speed and adjustment accuracy. The current electronic expansion valve generally includes a lead screw, a valve core, a nut and other parts. The lead screw is set in the valve body, and the valve core is set in the valve cavity in the valve body. The threaded fit of the lead screw and the valve core drives the valve core to move. The valve core needs a higher operating speed during operation. At the same time, the operating environment of the lead screw is in a relatively high pressure environment, so that the lead screw will be axially displaced under a large force when starting and collide with the valve body, thereby emitting a large operating noise, which not only affects the driving experience, but also reduces the service life of the valve body.

[0003] Therefore, it is urgent to develop an electronic expansion valve for air conditioning that can reduce the startup noise during operation and prevent the screw from hitting the valve body during startup, thereby reducing the noise while extending the service life of the valve body and reducing the probability of its damage. Summary of the invention

[0004] In view of this, the purpose of the utility model is to provide an electronic expansion valve for air conditioning, which does not make loud operating noise during operation, and because the lead screw does not hit the valve body during startup, the service life of the valve body is extended.

[0005] The utility model discloses an electronic expansion valve for automobile air conditioner, comprising:

[0006] A valve body, wherein the valve body has a valve cavity;

[0007] A valve core is disposed in the valve cavity and can be driven to move up and down along the central axis of the valve body;

[0008] A lead screw is disposed in the valve body and cooperates with the valve core thread to drive the valve core to move up and down reciprocatingly;

[0009] The elastic member is arranged in the valve body and corresponds to the upper part of the lead screw. The elastic member is arranged in the valve body to play a buffering role, reducing the probability of axial displacement and impacting the valve body when the lead screw starts to run, thereby reducing operating noise and extending service life.

[0010] Furthermore, one end of the lead screw away from the valve cavity extends upward to form a support shaft, and the upper part of the support shaft is supported on the valve body through a first bearing member; the upper part of the support shaft is supported on the valve body through the first bearing member, and the lead screw is supported on the valve body, which can improve the reliability of the overall structure.

[0011] Furthermore, it also includes a second bearing component and a third bearing component, the second bearing component is sleeved on one end of the support shaft close to the screw, and the third bearing component is sleeved on a position of the screw close to the valve chamber; the second bearing component and the third bearing component are arranged so that the screw is supported on the valve body, which can reduce the friction of the screw during operation, thereby reducing the operation noise.

[0012] Furthermore, the elastic member is arranged between the first bearing member and the second bearing member, and the diameter of the support shaft is smaller than the diameter of the lead screw; the elastic member is arranged between the first bearing member and the second bearing member, which can play a buffering role, and at the same time, the diameter of the support shaft is smaller than the diameter of the lead screw, which can save materials while achieving support.

[0013] Furthermore, it also includes a valve inlet channel and a valve outlet channel, which are connected to the valve cavity and arranged on the valve body. 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; the structure of the valve inlet channel is set to be first large and then small, and the structure of the valve outlet channel is set to be first small and then large. In the process of the fluid flowing into the valve inlet channel and flowing out of the valve outlet channel, the fluid can be expanded twice, thereby improving the refrigeration efficiency, and at the same time, the kinetic energy loss at the electronic expansion valve can be reduced.

[0014] Furthermore, the valve inlet channel comprises a first cavity section I, a second cavity section I and a third cavity section I which are connected in sequence, the first cavity section I is a cylindrical structure, the second cavity section I is a tapered structure which tapers forward, the third cavity section I is a thin tube structure, and the third cavity section 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 play a throttling role when the fluid flows through, and at the same time, the fluid can have a larger flow rate when passing through the third cavity section I, which can reduce the temperature of the fluid;

[0015] 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 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.

[0016] Furthermore, the bottom of the valve cavity is a tapered structure that tapers forward, and one side of the inlet of the first cavity segment II is set corresponding to the tip of the tapered structure, and the other side is set corresponding to the lower position of the tapered surface of the tapered structure; setting the bottom of the valve cavity as a tapered structure that tapers forward can make it easier to control the flow rate passing through the valve cavity, and at the same time, setting one side of the inlet of the first cavity segment II corresponding to the tip of the tapered structure can reduce the resistance encountered by the fluid when it travels from the valve inlet channel to the valve outlet channel when the valve body is in an open state.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] Beneficial effects of the utility model: the electronic expansion valve for air conditioner of the utility model has an elastic member arranged in the valve body, which can play a buffering role, reduce the probability of axial displacement of the lead screw to impact the valve body when the electronic expansion valve is started, thereby reducing operating noise and extending service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0022] Figure 1 It is a schematic diagram of the structure of the utility model;

[0023] The above drawings contain the following reference numerals:

[0024] 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; 110. Elastic member; 111. First bearing member; 112. Second bearing member; 113. Third bearing member; 2. Valve core; 3. Lead screw; 301. Support shaft; 4. Stator; 5. Rotor; 6. Valve cavity. DETAILED DESCRIPTION

[0025] Figure 1 It is a schematic diagram of the structure of the utility model, such as Figure 1 As shown: An electronic expansion valve for air conditioning in this embodiment includes:

[0026] A valve body 1, wherein the valve body 1 has a valve cavity 6; the valve body 1 comprises an upper valve body and a lower valve body, the upper valve body and the lower valve body are fixedly connected, the valve cavity 6 is arranged in the lower valve body, and the upper valve body extends upward (upward and downward in the figure) to form a valve cover;

[0027] The valve core 2 is disposed in the valve cavity 6 and can be driven to move up and down along the central axis of the valve body 1;

[0028] The lead screw 3 is arranged in the valve body 1 and is threadedly matched with the valve core 2 to drive the valve core 2 to move up and down reciprocatingly; the valve core 2 is provided with a nut portion, and the lead screw 3 is threadedly matched with the nut portion, thereby driving the valve core 2 to move up and down reciprocatingly (i.e. axially);

[0029] The elastic member 110 is arranged in the valve body 1 and corresponds to the upper part of the lead screw 3; the elastic member 110 can be a spring, a reed, a torsion spring, etc. By setting the elastic member 110, a buffering effect can be played, and the probability of the lead screw 3 axially displaced and colliding with the valve body 1 under a large force when starting can be avoided, thereby reducing operating noise and extending service life.

[0030] In the prior art, an electronic expansion valve generally includes a lead screw, a valve core, a nut and other parts. The lead screw is arranged on the valve body, and the valve core is arranged in the valve cavity in the valve body. The threaded cooperation of the lead screw and the valve core drives the valve core to move. The valve core requires a higher operating speed during operation. At the same time, the operating environment of the lead screw is in a relatively high pressure environment, so that the lead screw will undergo axial displacement and collide with the valve body under a relatively large force during startup, thereby emitting a relatively large operating noise, which not only affects the driving experience, but also reduces the service life of the valve body. The electronic expansion valve for air conditioning of the utility model can reduce the startup noise during operation and avoid the lead screw from hitting the valve body during startup, thereby reducing the noise while extending the service life of the valve body and reducing the probability of damage thereof.

[0031] In this embodiment, one end of the lead screw 3 away from the valve chamber 6 extends upward to form a support shaft 301, and the upper part of the support shaft 301 is supported on the valve body 1 through a first bearing member 111; in this structure, the first bearing member 111 is arranged at the position of the valve cover of the upper valve body, and the end of the lead screw 3 away from the valve chamber 6 (the end of the valve cover close to the upper valve body) is supported on the valve body through the first bearing member 111. The provision of the first bearing member 111 can not only play a supporting role, but also reduce friction, thereby further reducing operating noise, and at the same time making the structure reliable. The first bearing member 111 can be a sliding bearing, etc.

[0032] In this embodiment, it also includes a second bearing member 112 and a third bearing member 113. The second bearing member 112 is sleeved on one end of the support shaft 301 close to the screw 3, and the third bearing member 113 is sleeved on a position of the screw 3 close to the valve chamber 6; the second bearing member 112 and the third bearing member 113 can be thrust needle bearings, and the second bearing member 112 is arranged close to the connection between the support shaft 301 and the screw 3, and the third bearing member 113 is arranged on the screw 3 corresponding to the connection between the upper valve body and the lower valve body. By arranging the second bearing member 112 and the third bearing member 113, the screw 3 is supported on the valve body 1, which can reduce the friction of the screw 3 during operation, thereby reducing the operation noise.

[0033] In this embodiment, the elastic member 110 is arranged between the first bearing member 111 and the second bearing member 112, and the diameter of the support shaft 301 is smaller than the diameter of the screw 3; the elastic member 110 is arranged between the first bearing member 111 and the second bearing member 112, which can play a buffering role. At the same time, the diameter of the support shaft 301 is smaller than the diameter of the screw 3, which can save materials while achieving support.

[0034] In the present embodiment, it also includes a valve inlet channel and a valve outlet channel, which are connected to the valve cavity 6 and arranged on the valve body 1. The valve inlet channel is a structure that is large at first and then small, and the valve outlet channel is a structure that is small at first and then large. The valve inlet channel and the valve outlet channel are in the same straight line; the valve inlet channel and the valve outlet channel are arranged in the same straight line. When the structure of the valve inlet channel and the valve outlet channel is cylindrical, the valve inlet channel and the valve outlet channel are coaxially arranged. When the structure of the valve inlet channel and the valve outlet channel is square, the valve inlet channel and the valve outlet channel are arranged with the same center line, which 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 large at first and then small and setting the valve outlet channel to a structure that is small at first and then large, the fluid can be expanded twice, thereby improving the refrigeration efficiency.

[0035] 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 tapered structure that tapers forward, and the third cavity segment Ⅰ106 is a thin tube structure, and the third cavity segment Ⅰ106 is connected to the valve cavity 6; the diameter (width) of the first cavity segment Ⅰ108 is larger 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;

[0036] The valve outlet channel includes a first cavity section Ⅱ102, a second cavity section Ⅱ103 and a third cavity section Ⅱ104 which are connected in sequence, the first cavity section Ⅱ102 is a thin tube structure, the second cavity section Ⅱ103 is a conical structure which gradually expands forward, the third cavity section Ⅱ104 is a columnar structure, and the first cavity section Ⅱ102 is connected to the valve cavity 6; the diameter of the first cavity section Ⅱ102 is smaller than the diameter of the third cavity section Ⅱ103, and the diameter of the first cavity section Ⅱ102 can be consistent with the diameter of the third cavity section Ⅰ103. 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.

[0037] In this embodiment, the bottom of the valve cavity 6 is a tapered structure 105 that tapers forward; one side of the inlet of the first cavity section II 102 is arranged corresponding to the tip of the tapered structure 105, and the other side is arranged corresponding to the lower position of the tapered surface of the tapered structure 105; the bottom is one end close to the valve inlet channel (the lower part in the up and down direction shown in the figure); the end of the tapered structure 105 close to the valve outlet channel is the tip of the tapered structure; by setting the bottom of the valve cavity 6 as a tapered structure, it is convenient to control the valve flow of the valve body 1; the first cavity section II 102 is arranged relative to the valve body 1 The axis is arranged at an angle, and by arranging one side of the entrance of the first cavity section II 102 corresponding to the front end of the conical structure 105 (one side of the entrance of the first cavity section II 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. A sealing surface cooperating with the conical structure 105 is arranged on the valve core 2, and when the valve core 2 is driven to move up and down along the central axis of the valve body 1, it is convenient to adjust the flow of the valve body 1 and the flow of the valve body 1.

[0038] 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 109, and the valve core 2 does not rotate circumferentially through the cooperation between the groove 101 and the limiting mechanism 109. 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.

[0039] 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.

[0040] In this embodiment, a controller is also included, and the controller is used to control the current size and time of the stator. 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.

[0041] 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 air conditioning, characterized in that: include: A valve body, wherein the valve body has a valve cavity; A valve core is disposed in the valve cavity and can be driven to move up and down along the central axis of the valve body; A lead screw is disposed in the valve body and cooperates with the valve core thread to drive the valve core to move up and down reciprocatingly; The elastic member is arranged in the valve body and correspondingly arranged on the upper part of the lead screw.

2. The electronic expansion valve for air conditioning according to claim 1, characterized in that: One end of the lead screw away from the valve cavity extends upward to form a support shaft, and the upper part of the support shaft is supported on the valve body through a first bearing member.

3. The electronic expansion valve for air conditioning according to claim 2, characterized in that: It also includes a second bearing component and a third bearing component. The second bearing component is sleeved on one end of the support shaft close to the lead screw, and the third bearing component is sleeved on a position of the lead screw close to the valve chamber.

4. The electronic expansion valve for air conditioning according to claim 3, characterized in that: The elastic member is disposed between the first bearing member and the second bearing member, and the diameter of the support shaft is smaller than the diameter of the lead screw.

5. The electronic expansion valve for air conditioning according to claim 1, characterized in that: It also includes a valve inlet channel and a valve outlet channel, which are connected to the valve cavity and arranged on the valve body. The valve inlet channel is a structure that is large at first and then small, and the valve outlet channel is a structure that is small at first and then large. The valve inlet channel and the valve outlet channel are in the same straight line.

6. The electronic expansion valve for air conditioning according to claim 5, characterized in that: The valve inlet passage comprises a first cavity section I, a second cavity section I and a third cavity section I which are connected in sequence, the first cavity section I is a cylindrical structure, the second cavity section I is a tapered structure which tapers forward, the third cavity section I is a thin tube structure, and the third cavity section I is connected to the valve cavity; 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.

7. The electronic expansion valve for air conditioning according to claim 6, characterized in that: The bottom of the valve cavity is a tapered structure that tapers forward. One side of the inlet of the first cavity section II is arranged corresponding to the tip of the tapered structure, and the other side is arranged corresponding to the lower part of the tapered surface of the tapered structure.

8. The electronic expansion valve for air conditioning according to claim 1, 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 air conditioning according to claim 1, 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 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.

Images