Four-way reversing valve with brushless motor

Abstract

The utility model discloses a four-way reversing valve with a brushless motor, which comprises a valve seat, a planetary reducer, a reversing valve disc device, a magnetic ring isolation sleeve, a brushless motor device, a central shaft and a shaft piece, and the output end of the planetary reducer is connected with the reversing valve disc device. The rotor is connected with the input end of the planetary reducer; the magnetic ring isolation sleeve comprises an upper shell and a lower shell; the lower shell is fixed on the valve seat; the planetary reducer and the reversing valve disc device are installed in the lower shell. The upper shell comprises a coil cavity and a positioning shaft hole; the stator is mounted in the coil cavity; the shaft piece is coaxially mounted in the positioning shaft hole; the center shaft sequentially penetrates through the rotor, the planetary reducer and the reversing valve disc device. The four-way reversing valve has the advantages of being small in size, attractive in appearance, capable of reducing noise, small in current and large in torque.

Description

Technical Field

[0001] The utility model relates to a four-way reversing valve with a brushless motor, in particular to a four-way reversing valve with a brushless motor. Background Art

[0002] At present, the direct-acting four-way reversing valve is mainly composed of a DC motor, a magnetic linkage component, a planetary reducer and a reversing valve disc device. The direct-acting four-way reversing valve still has certain problems, as follows:

[0003] 1. Since the DC motor is placed outside the valve body, the volume increases, occupying the installation space of the outdoor unit of the household air conditioner;

[0004] 2. Since the torque of a DC motor is proportional to its speed, the higher the speed, the greater the torque. Due to the high speed of the DC motor, the operating noise of the four-way reversing valve will increase. If the speed is low, the torque will decrease;

[0005] 3. Due to the high speed and high torque of the DC motor, the stall current of the DC motor is relatively large when it is stalled, which will further increase the power control requirements of the air conditioning control board. This will undoubtedly increase the material cost of the air conditioning control board. Utility Model Content

[0006] The utility model aims to provide a four-way reversing valve with a brushless motor, in particular to provide a four-way reversing valve with a brushless motor.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A four-way reversing valve with a brushless motor, comprising a valve seat, a planetary reducer, and a reversing valve disc device, wherein the output end of the planetary reducer is connected to the reversing valve disc device; the feature is that it also comprises a magnetic ring isolation sleeve, a brushless motor device, a central shaft, and a shaft sheet;

[0009] The brushless motor device includes a stator and a rotor;

[0010] The rotor is connected to the input end of the planetary reducer;

[0011] The magnetic ring isolation sleeve comprises an upper shell and a lower shell;

[0012] The lower housing is fixed on the valve seat;

[0013] The planetary reducer is installed in the lower housing;

[0014] The upper shell includes a coil cavity and a positioning shaft hole;

[0015] The stator is installed in the coil cavity; the shaft piece is coaxially installed in the positioning shaft hole; one end of the central shaft is installed in the positioning shaft hole through the shaft piece, and the other end is installed in the central hole of the valve seat.

[0016] The central axis passes through the rotor, the planetary reducer and the reversing valve disc device in sequence.

[0017] As a preferred embodiment of a four-way reversing valve with a brushless motor provided by the utility model, the rotor includes a guide column, a first shaft hole matching the central axis is formed at the center of the guide column; a first connecting port is formed below the guide column; the first shaft hole runs through the first connecting port. The function of the first connecting port is to connect with a planetary reducer as a power source for the planetary reducer.

[0018] As a preferred embodiment of a four-way reversing valve with a brushless motor provided by the utility model, a magnetic ring is formed outside the guide column, and the magnetic ring is coaxial with the outer wall of the coil cavity and spaced from the outer wall of the coil cavity.

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

[0020] In the utility model, the brushless motor is built into the upper shell of the magnetic ring isolation sleeve through the magnetic ring isolation sleeve, which greatly reduces the volume of the four-way reversing valve;

[0021] In the utility model, a brushless motor is adopted, which further reduces the operating noise of the four-way reversing valve under the condition of low speed and high torque, bringing a comfortable feeling to people;

[0022] At the same time, under the condition of low speed and high torque, the blocking current generated by the four-way reversing valve when it is blocked is reduced, so as to meet the power requirement of the air-conditioning control panel without adding additional cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The utility model is further described with reference to the accompanying drawings:

[0024] Figure 1 This is a schematic diagram of the internal structure of the four-way reversing valve of the utility model;

[0025] Figure 2 This is a schematic diagram of the structure of the magnetic ring isolation sleeve in the utility model;

[0026] Figure 3 This is a schematic diagram of the external structure of the rotor of the brushless motor in the utility model;

[0027] Figure 4 This is a schematic diagram of the internal structure of the rotor of the brushless motor in the utility model;

[0028] In the figure, 1-valve seat, 2-center axis, 3-drive valve disc, 4-rotating slider, 5-magnetic ring isolation sleeve, 501-lower shell, 502-coil cavity, 503-positioning shaft hole, 6-planetary reducer, 7-rotor, 701-first shaft hole, 702-magnetic ring, 703-guide column, 704-first connecting port, 8-stator, 9-shaft sheet. DETAILED DESCRIPTION

[0029] The technical solution of the utility model is further specifically described below through embodiments.

[0030] First of all, it is emphasized here that the valve seat 1, the reversing valve disc device, and the planetary reducer 6 are already disclosed in the prior art, and the reversing valve disc device includes a driving valve disc and a rotating slider. The technical features and connection methods of the above components are not described in detail here.

[0031] Please refer to Figure 1 to Figure 4 As shown, a four-way reversing valve with a brushless motor described in this embodiment includes a valve seat 1, a planetary reducer 6, a reversing valve disc device, a magnetic ring isolation sleeve 5, a brushless motor device, a central shaft 2, and a shaft sheet 9;

[0032] Wherein, the brushless motor device comprises a stator 8 and a rotor 7;

[0033] The magnetic ring isolation sleeve 5 includes an upper shell and a lower shell 501. Figure 2 More specifically combined Figure 1 As shown, the magnetic ring isolation sleeve 5 is further described as follows:

[0034] The planetary reducer 6 and the reversing valve disc device are installed in the lower housing 501. The output end of the planetary reducer 6 is connected to the reversing valve disc device. At the same time, the lower housing 501 is fixedly connected to the valve seat 1 by welding.

[0035] The upper housing includes a coil cavity 502 and a positioning shaft hole 503. The coil cavity 502 is used to install the stator 8 of the brushless motor. In order to improve the compressive strength, glue needs to be poured after the stator 8 is installed. The main purpose of glue pouring is: on the one hand, to fix the stator 8, on the other hand, to prevent the winding on the stator 8 from short-circuiting, and finally, to further enhance the compressive strength of the magnetic ring isolation sleeve.

[0036] The positioning shaft hole 503 is used to install the shaft piece 9. The shaft piece 9 is mainly used to perform center positioning on the central shaft 2.

[0037] One end of the central shaft 2 is installed in the positioning shaft hole 503 through the shaft sheet 9, and the other end is installed in the central hole of the valve seat 1.

[0038] Please pass Figure 1As shown, the shaft piece 9 is coaxially installed in the positioning shaft hole 503, and there can be a clearance fit between the two, and the clearance is ≤0.1mm. If the clearance is too large, the rotor 7 will move eccentrically during the operation of the brushless motor, making the operation unbalanced, which is greatly disadvantageous to noise reduction. The shaft piece 9 and the positioning shaft hole 503 can also be slightly overfitted. This fit method greatly ensures the dynamic balance of the rotor 7 during the operation of the brushless motor, which is conducive to further noise reduction.

[0039] In the present invention, the magnetic ring isolation sleeve 5 can be formed uniformly by a stamping die, or the lower shell 501 and the upper shell can be connected together by welding.

[0040] By using the specific features of the magnetic ring isolation sleeve 5, the stator of the brushless motor is built in, so that the volume of the four-way reversing valve is reduced and the appearance is neat and beautiful.

[0041] In order to ensure that the brushless motor, the planetary reducer 6 and the reversing valve disc device can move coaxially, the central shaft 2 passes through the rotor 7, the planetary reducer 6 and the reversing valve disc device in sequence.

[0042] For further explanation of the power source of the planetary reducer 6 - the rotor 7 in the brushless motor, please refer to Figure 3 , Figure 4 Combination Figure 1 , as follows:

[0043] The rotor 7 includes a guide column 703, the center of which forms a first shaft hole 701 matching the central axis 2; a first connection port 704 is formed below the guide column 7; the first shaft hole 701 runs through the first connection port 704. The function of the first connection port 704 is to connect with the planetary reducer as a power source for the planetary reducer. In order to reduce costs, the shape of the first connection port 704 is directly set to a sun gear. Of course, the shape of the first connection port 704 is not necessarily a sun gear.

[0044] The main function of the guide post 703 is to perform axial positioning. Without the guide post 703, the rotor 7 will contact the lower end surface of the coil cavity 502, and the contact area between the two will be large, which will further increase the resistance of the brushless motor operation. At the same time, when the brushless motor is running, the current will also increase, which is not conducive to the design of the air conditioning control panel. The long lead design of the guide post 703 further ensures the dynamic balance of the rotor 7.

[0045] A magnetic ring 702 is formed on the outside of the guide column 703, and the magnetic ring 702 is coaxial with the outer wall of the coil cavity 502 and spaced from the outer wall of the coil cavity 502. In order to further reduce noise, the more pole pairs the magnetic ring 702 has, the lower the rotation speed is, and the smaller the vibration generated during operation. The more pole pairs the brushless motor has, the greater the torque generated. Therefore, the number of pole pairs of the magnetic ring 702 is generally set to 5 to 10 pairs of poles. The greater the driving torque, the smaller the current required, which is more conducive to the design of the air conditioning control panel.

[0046] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable those skilled in the art to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the essence of the content of the utility model should be included in the protection scope of the utility model.

Claims

1. A four-way reversing valve with a brushless motor, comprising a valve seat (1), a planetary reducer (6), and a reversing valve disc device, wherein the output end of the planetary reducer (6) is connected to the reversing valve disc device; characterized in that: It also includes a magnetic ring isolation sleeve (5), a brushless motor device, a central shaft (2), and a shaft piece (9); The brushless motor device comprises a stator (8) and a rotor (7); The rotor (7) is connected to the input end of the planetary reducer (6); The magnetic ring isolation sleeve (5) comprises an upper shell and a lower shell (501); The lower shell (501) is fixed on the valve seat (1); The planetary reducer (6) and the reversing valve disc device are installed in the lower housing (501); The upper housing comprises a coil cavity (502) and a positioning shaft hole (503); The stator (8) is installed in the coil cavity (502); the shaft piece (9) is coaxially installed in the positioning shaft hole (503); one end of the central shaft (2) is installed in the positioning shaft hole (503) through the shaft piece (9), and the other end is installed in the central hole of the valve seat (1); The central axis (2) sequentially passes through the rotor (7), the planetary reducer (6), and the reversing valve disc device.

2. A four-way reversing valve with a brushless motor according to claim 1, characterized in that: The rotor (7) comprises a guide column (703), the center of which forms a first axial hole (701) matching the central axis (2); a first connecting port (704) is formed below the guide column (703); and the first axial hole (701) passes through the first connecting port (704).

3. A four-way reversing valve with a brushless motor according to claim 2, characterized in that: A magnetic ring (702) is formed outside the guide column (703), and the magnetic ring (702) is coaxial with the outer wall of the coil cavity (502) and is spaced apart from the outer wall of the coil cavity (502).

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