Motor Direct Drive Refrigerant Multi-Port Valve

Abstract

The utility model discloses a motor-direct-driven refrigerant multi-way valve, comprising: a valve housing, the valve housing having an inner cavity with an opening at one end, and the valve housing being provided with a plurality of through holes connecting the inner cavity with the outside of the valve housing; a valve core, the valve core being slidably fitted in the inner cavity in a manner that it can be driven to slide along an axial single degree of freedom, and a plurality of grooves being arranged at intervals along the axial direction on the outer peripheral surface of the valve core; a driving motor, the driving motor being fixedly connected to the open end of the valve housing, and the output shaft of the driving motor being connected to the valve core through a screw-nut pair transmission; in the motor-direct-driven refrigerant multi-way valve provided by the utility model, the valve core is directly driven to move by the driving motor, which is more conducive to the overall compactness and lightweight design; at the same time, the driving mechanism is a driving motor + screw-nut pair structure, which has basically no impact on the valve core, thereby improving the NVH performance; and since the valve core runs smoothly, there is no need to design a reset spring, thus eliminating the need for a space design for the reset spring stroke, thereby helping to reduce the length of the overall structure of the valve body.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobile component structure design, and in particular relates to a motor-direct-driven refrigerant multi-way valve. Background Art

[0002] In traditional automobile air-conditioning systems, it is generally necessary to use multiple one-way valves, stop valves, etc. to control the flow direction of the refrigerant (refrigerant), which occupies a large space and makes it difficult to arrange parts in the front cabin. In the related art, the control functions of multiple one-way valves and stop valves are integrated into a valve body to form a refrigerant multi-way valve, which saves layout space to a certain extent. However, the valve core of the existing refrigerant multi-way valve is basically driven by an electromagnet in combination with a return spring. Since the refrigerant has a high-pressure section and the multi-way valve has many sealing nodes, the resistance to the movement of the valve core is large. In order to achieve the movement of the valve core, a larger electromagnet is usually required, and the overall volume and weight are large; and the return spring stroke needs to occupy a certain length dimension, making the overall length of the refrigerant multi-way valve longer. In addition, when the electromagnet is used to switch the multi-way valve mode, because the electromagnetic force is formed instantly, it is inevitable that the valve core hits the valve housing to generate a large noise, which is not conducive to the improvement of the NVH of the whole vehicle. Therefore, it is necessary to improve the structure of the existing refrigerant multi-way valve in order to improve the overall compactness, reduce the volume and weight, and improve the overall NVH performance. Utility Model Content

[0003] In view of this, the purpose of the utility model is to provide a motor-direct-driven refrigerant multi-way valve, which can effectively improve the overall compactness, reduce the volume and weight, and improve the overall NVH performance.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a motor-direct-driven refrigerant multi-way valve, comprising: a valve housing, the valve housing having an inner cavity with an opening at one end, and the valve housing being provided with a plurality of through holes connecting the inner cavity with the outside of the valve housing; a valve core, the valve core being slidably mounted in the inner cavity in a manner that it can be driven to slide along an axial single degree of freedom, and a plurality of grooves being arranged on the outer peripheral surface of the valve core at intervals along the axial direction; a driving motor, the driving motor being fixedly connected to the open end of the valve housing, and the output shaft of the driving motor being connected to the valve core through a screw nut pair.

[0005] Furthermore, a threaded hole is provided on the end surface of the valve core close to the opening end of the valve housing, and the threaded hole and the valve core form a nut of a screw-nut pair.

[0006] Furthermore, the screw of the screw-nut pair and the output shaft of the drive motor are an integrated structure.

[0007] Furthermore, the driving motor is a DC stepping motor.

[0008] Furthermore, a first weight-reducing hole is provided on the end surface of the valve core close to the opening end of the valve housing.

[0009] Furthermore, one end of the valve housing away from the opening end of the valve housing is sealed with an end cover.

[0010] Furthermore, the valve core is a cylinder, and the end cover is provided with a limiting structure for limiting the rotation of the valve core.

[0011] Furthermore, the limiting structure includes a cylindrical protrusion that is an integral structure with the end cover, a linear guide groove is provided on the outer peripheral surface of the cylindrical protrusion, and a sliding block that is slidably matched in the linear guide groove is provided at the corresponding end of the valve core.

[0012] Furthermore, a second weight-reducing hole is provided on the outer end surface of the end cover.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] The motor-driven refrigerant multi-way valve provided by the utility model has a valve core that is directly driven and moved by a driving motor. Under the premise of satisfying the driving force of the valve core, the volume and weight are smaller than those of an electromagnet-driven structure, which is more conducive to the overall compactness and lightweight design. At the same time, the driving mechanism is a driving motor + a lead screw nut substructure, which has basically no impact on the valve core, thereby improving the NVH performance, and is particularly suitable for electric vehicles with high requirements for NVH performance. Moreover, since the valve core runs smoothly, there is no need to design a return spring, thereby eliminating the need for a space design for the return spring stroke, which is conducive to reducing the length of the overall structure of the valve body, and has a significant effect on reducing the size in the length direction. In addition, the entire driving structure is simple, and the switching of the hot and cold modes of the refrigerant multi-way valve can be realized more conveniently, which is conducive to cost control. Since it is directly driven by a motor, it is more conducive to meeting the integration of more valve ports.

[0015] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and will be apparent to those skilled in the art based on the following examination and research, or can be taught from the practice of the present invention to some extent. The objectives and other advantages of the present invention can be achieved and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the cross-sectional structure of the utility model when the valve core is located at one end of the valve housing

[0017] Figure 2 Schematic diagram of the cross-sectional structure of the utility model when the valve core is located at the other end of the valve housing

[0018] Figure 3 This is a schematic diagram of the matching structure of the valve core and the end cover of the utility model

[0019] Figure markings: 1-valve housing; 101-inner cavity; 102-through hole; 2-valve core; 201-groove; 202-threaded hole; 203-first weight-reducing hole; 204-slider; 3-drive motor; 301-output shaft; 4-screw nut pair; 5-end cover; 501-limiting structure; 501a-cylindrical protrusion; 501b-linear guide groove; 502-second weight-reducing hole. DETAILED DESCRIPTION

[0020] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only used to illustrate the basic concept of the present invention, and the following embodiments and the features in the embodiments can be combined with each other without conflict.

[0021] See also Figure 1-3 The present embodiment discloses a motor-direct-driven refrigerant multi-way valve, comprising: a valve housing 1, wherein the valve housing 1 has an inner cavity 101 opened at one end, and the valve housing 1 is provided with a plurality of through holes 102 connecting the inner cavity 101 with the outside of the valve housing 1, and the through holes 102 can be used for the pipeline of an external air-conditioning system. Specifically, the number of the through holes 102 here is nine, i.e., a nine-way valve, and of course, other numbers of valve ports can be used according to integration requirements; a valve core 2, wherein the valve core 2 is slidably mounted in the inner cavity 101 in a manner that it can be driven to slide along a single degree of freedom in the axial direction, and a plurality of grooves 201 are arranged on the outer peripheral surface of the valve core 2 at intervals along the axial direction, and the grooves 201 cooperate with the inner cavity 101 to form a relatively independent closed air When the valve core 2 moves to the corresponding end position, the corresponding through hole 102 can be connected through the groove 201; the drive motor 3, the drive motor 3 is fixedly connected to the open end of the valve housing 1, and the drive motor 3 can be welded, threaded or screwed to the valve housing 1 to complete the fixation with the valve housing 1, and the output shaft 301 of the drive motor 3 is connected to the valve core 2 through a screw nut pair 4. The drive motor 3 preferably adopts a DC stepping motor, and the screw nut pair 4 converts the rotational motion of the drive motor 3 into the linear motion of the valve core 2. In the refrigerant multi-way valve structure, usually only the switching of the hot and cold modes is required, that is, it is only necessary to control the movement of the valve core 2 between two positions, that is, the valve core 2 moves to Figure 1The leftmost or rightmost end of the middle valve housing 1, where the through hole 101 is distributed, and the corresponding position relationship between the groove 201 and the through hole 101 can be determined according to the control logic of the hot and cold switching pipeline of the automobile air-conditioning system, and can be designed with reference to the existing conventional refrigerant multi-way valve structure. The specific connection relationship of the through hole 101 will not be described here;

[0022] In the motor-direct-driven refrigerant multi-way valve in the above structure, the valve core 2 is directly driven to move by the driving motor 3. Under the premise of satisfying the driving force of the valve core 2, the volume and weight are smaller than those of the electromagnet-driven structure, which is more conducive to the overall compactness and lightweight design; at the same time, the driving mechanism is a driving motor 3 + lead screw nut pair 4 structure, which has basically no impact on the valve core 2, improves the NVH performance, and is particularly suitable for electric vehicles with high requirements for NVH performance; and because the valve core 2 runs smoothly, there is no need to design a return spring, which saves the space design of the return spring stroke, and is conducive to reducing the length of the overall structure of the valve body, and has a significant effect on reducing the size in the length direction; in addition, the entire driving structure is simple, and the switching of the hot and cold modes of the refrigerant multi-way valve can be realized more conveniently, which is conducive to cost control; because it is directly driven by a motor, it is more conducive to meeting the integration of more valve ports and saving more space.

[0023] In this embodiment, a threaded hole 202 is provided on the end face of the valve core 2 close to the open end of the valve housing 1. The threaded hole 202 and the valve core 2 constitute a nut of a screw nut pair 4. In this structural design, the threaded hole 202 is directly opened on the valve core 2, which is beneficial to further reduce the overall length dimension. The screw of the screw nut pair 4 can be screwed into the threaded hole 202 to drive the valve core 2 to make a linear motion; and because the screw is directly threadedly connected to the valve core 2, there is no need to set a nut sleeve on the valve core 2, which is beneficial to reducing the radial dimension of the valve core 2. In particular, a groove 201 is set on the valve core 2. If an additional nut sleeve is designed, the wall thickness of the groove 201 end of the valve core 2 will be smaller at the end of the nut sleeve corresponding to the groove 201, and the overall size of the valve core 2 needs to be increased. However, directly opening the threaded hole 2 can reduce the radial dimension of the valve core 2 to a certain extent.

[0024] In this embodiment, the screw of the screw-nut pair 4 and the output shaft 301 of the drive motor 3 are an integrated structure, that is, the thread of the screw is directly processed and formed on the output shaft 301. This structural design has good structural strength and reliable force transmission. It is also beneficial to reduce the end plate design outside the design and reduce the design of the connecting parts, which is beneficial to further improve the lightweight.

[0025] In this embodiment, the drive motor 3 is a DC stepper motor. The rotation angle of the DC stepper motor is divided, and each step angle can be very small, so the positioning accuracy is relatively high; at the same time, the response speed of the DC stepper motor is also very fast, and the dynamic response can be completed in a very short time, which is suitable for occasions requiring high-speed and high-precision positioning; at the same time, the DC stepper motor drives the rotor to rotate by discrete step angles, resulting in less mechanical vibration and relatively smooth operation. The noise of the DC stepper motor is also very low, which is conducive to further improving the NVH performance; in addition, the DC stepper motor does not require feedback devices and can also achieve closed-loop control, so it is not only simple to control, but also relatively low in cost, which is conducive to saving production costs.

[0026] In this embodiment, a first weight-reducing hole 203 is provided on the end face of the valve core 2 close to the opening end of the valve housing 1. By designing the weight-reducing hole, the overall lightweight performance is further improved, and the position of the first weight-reducing hole 203 is reasonably designed without affecting the layout design of the groove 201.

[0027] In this embodiment, the end of the valve housing 1 away from the open end of the valve housing 1 is sealed and connected with an end cover 5; by designing the end cover 5, the end cover 5 can be independently processed, which is beneficial to the processing of the valve housing 1. The end cover 5 can be connected to the valve housing 1 by means of threaded connection, etc. In order to ensure sealing, an end face sealing ring can be designed.

[0028] In this embodiment, the valve core 2 is a cylinder, and the end cover 5 is provided with a limiting structure 501 for limiting the rotation of the valve core 2; the processing accuracy of the cylindrical valve core 2 is easy to control, and it is easy to process and assemble. Of course, the corresponding inner cavity 101 is also a circular hole. By designing a limiting structure 501 on the end cover 5 to prevent the valve core 2 from rotating, it is beneficial to realize the linear motion of the cylindrical valve core 2. Since the limiting structure 501 is designed on the end cover 5, it is beneficial to reduce the internal structure of the valve housing 1 and the valve core 2, and it is beneficial to arrange and seal the groove 201. The overall structure is simple, which is beneficial to reducing the manufacturing cost.

[0029] In this embodiment, the limiting structure 501 includes a cylindrical protrusion 501a which is an integral structure with the end cover 5, and the outer peripheral surface of the cylindrical protrusion 501a is provided with a linear guide groove 501b, and the corresponding end of the valve core 2 is provided with a slider 204 which slides in the linear guide groove 501b; in this structural design, when the valve core 2 is away from the cylindrical protrusion 501a, a larger chamber can be formed between the valve core 2 and the end cover 5, which is beneficial to ensure that the refrigerant has sufficient flow rate, and at the same time, the cylindrical protrusion 501a can play a role in limiting the extreme position of the valve core 2.

[0030] In this embodiment, the outer end surface of the end cover 5 is provided with a second weight-reducing hole 502 ; the design of the second weight-reducing hole 502 is conducive to further improving the lightweight performance, and the second weight-reducing hole 502 is reasonably positioned and does not affect the layout design of the limiting structure 501 .

[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. A motor-driven refrigerant multi-way valve, characterized in that: include: A valve housing (1), the valve housing (1) having an inner cavity (101) with an opening at one end, and the valve housing (1) is provided with a plurality of through holes (102) for connecting the inner cavity (101) with the outside of the valve housing (1); A valve core (2), the valve core (2) being slidably mounted in the inner cavity (101) in a manner that it can be driven to slide along a single degree of freedom in the axial direction, and a plurality of grooves (201) are arranged on the outer peripheral surface of the valve core (2) at intervals in the axial direction; A drive motor (3) is fixedly connected to the open end of the valve housing (1), and an output shaft (301) of the drive motor (3) is transmission-connected to the valve core (2) via a screw nut pair (4).

2. The motor-driven refrigerant multi-way valve according to claim 1, characterized in that: The end surface of the valve core (2) close to the opening end of the valve housing (1) is provided with a threaded hole (202), and the threaded hole (202) and the valve core (2) form a nut of a screw nut pair (4).

3. The motor-driven refrigerant multi-way valve according to claim 2, characterized in that: The screw of the screw-nut pair (4) and the output shaft (301) of the drive motor (3) are an integrated structure.

4. The motor-driven refrigerant multi-way valve according to claim 1, characterized in that: The driving motor (3) is a DC stepping motor.

5. The motor-direct-driven refrigerant multi-way valve according to claim 1, characterized in that: The end surface of the valve core (2) close to the opening end of the valve housing (1) is provided with a first weight-reducing hole (203).

6. The motor-direct-driven refrigerant multi-way valve according to claim 1, characterized in that: An end of the valve housing (1) away from the opening end of the valve housing (1) is sealedly connected to an end cover (5).

7. The motor-direct-driven refrigerant multi-way valve according to claim 6, characterized in that: The valve core (2) is a cylinder, and the end cover (5) is provided with a limiting structure (501) for limiting the rotation of the valve core (2).

8. The motor-direct-driven refrigerant multi-way valve according to claim 7, characterized in that: The limiting structure (501) comprises a cylindrical protrusion (501a) which is an integral structure with the end cover (5); a linear guide groove (501b) is provided on the outer peripheral surface of the cylindrical protrusion (501a); and a sliding block (204) which is slidably fitted in the linear guide groove (501b) is provided at the corresponding end of the valve core (2).

9. The motor-direct-driven refrigerant multi-way valve according to claim 8, characterized in that: The outer end surface of the end cover (5) is provided with a second weight-reducing hole (502).

Images