CN216158419U

CN216158419U - Four-way valve

Info

Publication number: CN216158419U
Application number: CN202121826268.2U
Authority: CN
Inventors: 不公告发明人
Original assignee: Zhejiang Sanhua Automotive Components Co Ltd
Current assignee: Zhejiang Sanhua Automotive Components Co Ltd
Priority date: 2021-05-28
Filing date: 2021-08-05
Publication date: 2022-04-01
Anticipated expiration: 2031-08-05

Abstract

The application relates to a four-way valve, which comprises a control circuit and a single-phase motor, wherein the four-way valve is provided with a first power interface and a second power interface, the first power interface and the second power interface are used for being connected with a power module, the single-phase motor comprises a first winding and a second winding, the control circuit comprises a control module, a switching relay, a locked rotor detection module, a first starting capacitor and a second starting capacitor, under the condition that the first starting capacitor is connected to the control circuit, the control module monitors the running state of the motor through the locked rotor detection module, if the locked rotor of the motor is detected, the control module sends a switching instruction to the switching relay, the switching relay switches the second starting capacitor to be connected into the control circuit, after the motor is restarted, if the running state of the motor is normal, the first starting capacitor fails, and if the running state of the motor is abnormal, the motor fails, the method is favorable for quickly positioning whether the motor is in a starting capacitor fault or a motor fault when the motor is locked, and the repair efficiency is improved.

Description

Four-way valve

Technical Field

The application relates to a four-way valve.

Background

The four-way valve is used in an air conditioning system, the flow direction of a refrigerant in a system pipeline is changed by a reversing motor to realize the mutual conversion between refrigeration and heating, the reversing motor is a single-phase motor, the current in two windings of the motor generates a phase difference of nearly 90 degrees by starting a capacitor to generate a rotating magnetic field, under the action of the rotating magnetic field, induced current is generated in a motor rotor, the current and the rotating magnetic field interact to generate electromagnetic field torque, so that the motor rotates, but when the motor is locked, how to quickly position whether the starting capacitor fault or the motor fault is the technical problem to be improved.

SUMMERY OF THE UTILITY MODEL

The application provides a four-way valve for how to fix a position fast when the motor of four-way valve takes place to block up changes and is start capacitor fault or motor fault.

In order to realize the purpose, the following technical scheme is adopted:

a four-way valve comprises a control circuit and a single-phase motor, wherein the single-phase motor comprises a first winding and a second winding, the four-way valve is provided with a first power interface and a second power interface, and the first power interface and the second power interface are used for being connected with a power module; the control circuit comprises a control module, a control switch, a locked rotor detection module and a starting capacitor module,

the control module is respectively connected with the control switch and the locked-rotor detection module, a first end of the control switch is respectively connected with the first power interface and a first end of the second winding, a second end of the control switch is connected with the starting capacitor module, a third end of the control switch is connected with a second end of the starting capacitor module, a third end of the starting capacitor module is connected with a first end of the first winding, a second end of the first winding and a second end of the second winding are both connected with the second power interface, and the locked-rotor detection module is connected with the single-phase motor and is used for detecting the running state of the single-phase motor;

the starting capacitor module comprises a first starting capacitor and a second starting capacitor, the control module controls the first end of the control switch to be selectively connected with the second end of the control switch or the third end of the control switch, if the first end of the control switch is connected with the second end of the control switch, the first starting capacitor is connected into the control circuit, and if the first end of the control switch is connected with the third end of the control switch, the second starting capacitor is connected into the control circuit.

The four-way valve comprises a single-phase motor and a control circuit, wherein the single-phase motor comprises a first winding and a second winding, the four-way valve is provided with a first power interface and a second power interface, the first power interface and the second power interface are used for being connected with a power module, the control circuit comprises a control module, a control switch, a stalling detection module and a starting capacitor module, the control module is respectively connected with the control switch and the stalling detection module, the first end of the control switch is respectively connected with the first power interface and the first end of the second winding, the second end of the control switch is connected with the first end of the starting capacitor module, the third end of the control switch is connected with the second end of the starting capacitor module, the third end of the starting capacitor module is connected with the first end of the first winding, the second end of the first winding and the second end of the second winding are both connected with the second power interface, and the stalling detection module is connected with the single-phase motor, the starting capacitor module is used for detecting the running state of the single-phase motor, the starting capacitor module comprises a first starting capacitor and a second starting capacitor, the control module controls the first end of the control switch to be selectively connected with the second end of the control switch or the third end of the control switch, if the first end of the control switch is connected with the second end of the control switch, the first starting capacitor is connected into the control circuit, if the first end of the switching relay is connected with the third end of the control switch, the second starting capacitor is connected into the control circuit, the control module monitors the running state of the motor through the locked rotor detection module, if the locked rotor of the motor is detected, the control module sends a switching instruction to the control switch, the control switch switches the second starting capacitor to be connected into the control circuit, after the motor is restarted, if the running state of the motor is normal, the first starting capacitor is failed, if the running state of the motor is abnormal, the motor fault is beneficial to quickly positioning whether the capacitor fault or the motor fault is started when the motor is locked, and the repairing efficiency is improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

FIG. 1 is a schematic diagram of a four-way valve control circuit connected to a single-phase motor and a power module according to a first embodiment of the present application;

FIG. 2 is a schematic diagram of a four-way valve control circuit connected to a single-phase motor and a power module according to a second embodiment of the present disclosure;

FIG. 3 is a schematic diagram of a connection between a four-way valve control circuit and a single-phase motor and power module according to a third embodiment of the present application;

fig. 4 is a schematic structural view of the relay module according to fig. 3;

FIG. 5 is a schematic view of a four-way valve motor reversing configuration according to a fourth embodiment of the present application;

FIG. 6 is a schematic view of a four-way valve motor according to a fourth embodiment of the present application;

FIG. 7 is a schematic diagram of a four-way valve control circuit connected to a single-phase motor and a power module according to a fifth embodiment of the present disclosure;

FIG. 8 is a schematic diagram of a connection between a four-way valve control circuit and a single-phase motor and power module according to a sixth embodiment of the present application;

fig. 9 is a block diagram of a four-way valve and a power module according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments provided in the present application without any inventive step are within the scope of protection of the present application. Moreover, it should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of ordinary skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments without conflict.

Unless defined otherwise, technical or scientific terms referred to herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which this application belongs. Reference to "a," "an," "the," and similar words throughout this application are not to be construed as limiting in number, and may refer to the singular or the plural. The present application is directed to the use of the terms "including," "comprising," "having," and any variations thereof, which are intended to cover non-exclusive inclusions; for example, a process, method, system, article, or apparatus that comprises a list of steps or modules (elements) is not limited to the listed steps or elements, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. Reference to "connected," "coupled," and the like in this application is not intended to be limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Reference herein to "a plurality" means greater than or equal to two. "and/or" describes an association relationship of associated objects, meaning that three relationships may exist, for example, "A and/or B" may mean: a exists alone, A and B exist simultaneously, and B exists alone. Reference herein to the terms "first," "second," "third," and the like, are merely to distinguish similar objects and do not denote a particular ordering for the objects.

The embodiment provides a four-way valve which can be applied to an air conditioning system, the four-way valve comprises a single-phase motor and a control circuit, the motor can be used as a reversing motor of the four-way valve, the motor comprises a first winding L1 and a second winding L2, and the four-way valve is provided with two power interfaces, namely a first power interface A and a second power interface B. Fig. 1 is a schematic structural diagram of a control circuit of a four-way valve, which is connected to a single-phase motor and a power module according to an embodiment of the present disclosure, where as shown in fig. 1, the control circuit includes a control module 14, a control switch, a stalling detection module 15, and a starting capacitor module 13, the control switch may be a relay or other electrical elements capable of implementing the same function, in this embodiment, the control switch is a switching relay K2, the control module 14 is connected to the switching relay K2 and the stalling detection module 15, and the power module 11 may be built in the four-way valve or may be an external power module, which is not limited herein. The control module 14, the control switch, the locked rotor detection module 15 and the start capacitor module 13 may be separately provided electrical components or may be integrated modules. The live line end AC _ L of the power module 11 is connected with the first power interface A, and the null line end AC _ N of the power module 11 is connected with the second power interface B. The first end of switching relay K2 is connected with the first end of first power source A and second winding L2 respectively, the second end of switching relay K2 is connected with the first end of starting electric capacity module 13, the third end of switching relay K2 is connected with the second end of starting electric capacity module 13, the third end of starting electric capacity module 13 is connected with the first end of first winding L1, the second end of first winding L1 and the second end of second winding L2 all are connected with second power source B, stalling detection module 15 is connected with the motor, a running state for detecting the motor.

Referring to fig. 2, the start capacitor module 13 includes a first start capacitor C1 and a second start capacitor C2, the control module 14 controls the first terminal of the switching relay K2 to be selectively connected to the second terminal of the switching relay K2 or the third terminal of the switching relay K2, if the first terminal of the switching relay K2 is connected to the second terminal of the switching relay K2, the first start capacitor C1 is connected to the control circuit, that is, the first start capacitor C1 is connected to the first terminals of the first power source interface a and the second winding L2 through the switching relay K2, and if the first terminal of the switching relay K2 is connected to the third terminal of the switching relay K2, the second start capacitor C2 is connected to the control circuit, that is, the second start capacitor C2 is connected to the first terminals of the first power source interface a and the second winding L2 through the switching relay K2.

In this embodiment, when the first start capacitor C1 is connected to the control circuit, if the running state of the motor is abnormal, the second start capacitor C2 is connected to the control circuit, if the running state of the motor returns to normal, it is determined that the first start capacitor C1 has a fault, if the running state of the motor is also abnormal, it is determined that the motor has a fault, and the problem that when the motor is locked-rotor, the fault of the start capacitor or the motor cannot be quickly located, manual one-by-one troubleshooting is needed, so that the fault repair efficiency is low is solved, and the repair efficiency is improved.

In some embodiments, fig. 2 is a schematic structural diagram of another connection between a control circuit of a four-way valve and a single-phase motor and a power module according to an embodiment of the present disclosure, as shown in fig. 2, if a first terminal of a switching relay K2 is connected to a second terminal of a switching relay K2, a first starting capacitor C1 is connected to the control circuit, and if a first terminal of a switching relay K2 is connected to a third terminal of a switching relay K2, a second starting capacitor is connected to the control circuit, which includes:

as shown in fig. 2, the second terminal of the switching relay K2 is connected to the first terminal of the first start capacitor C1, the third terminal of the switching relay K2 is connected to the first terminal of the second start capacitor C2, and the second terminals of the first start capacitor C1 and the second start capacitor C2 are respectively connected to the first terminal of the first winding L1;

the control module 14 controls the first terminal of the switching relay K2 to be selectively connected with the second terminal of the switching relay K2 or the third terminal of the switching relay K2, the first starting capacitor C1 is connected into the control circuit in the case that the first terminal of the switching relay K2 is connected with the second terminal of the switching relay K2, and the second starting capacitor C2 is connected into the control circuit in the case that the first terminal of the switching relay K2 is connected with the third terminal of the switching relay K2. In this embodiment, if the motor is detected to be locked, the control module 14 turns off the power module 11, cuts off the power supply to the motor, the control module 14 sends a switching command to the switching relay K2, the switching relay K2 switches the second start capacitor C2 to be connected to the control circuit, and at this time, the first end of the switching relay K2 is disconnected with the second end of the switching relay K2, the first end of the switching relay K2 is connected with the third end of the switching relay K2, for connecting the second starting capacitor C2 to the control circuit, the control module 14 controls the power module 11 to be turned on, the motor is restarted, and if the running state of the motor is recovered to normal, the fault of the first starting capacitor C1 is judged, if the running state of the motor is still abnormal, the fault of the motor is judged, the fault of the starting capacitor or the fault of the motor can be quickly positioned when the motor is locked, and the repairing efficiency is improved.

In some embodiments, fig. 3 is a schematic structural diagram of a control circuit of a four-way valve according to a third embodiment of the present application, which is connected with a single-phase motor and a power module, as shown in fig. 3, the control circuit further includes a relay module 12, fig. 4 is a schematic structural diagram of a relay module in fig. 3, as shown in fig. 4, the relay module 12 includes a solid-state relay K1 and a forward/reverse relay K3,

the first end of the solid-state relay K1 is connected with the first power interface A, the second end of the solid-state relay K1 is connected with the first end of the forward and reverse relay K3, the second end of the forward and reverse relay K3 is connected with the second end of the first starting capacitor C1, the second end of the second starting capacitor C2 and the first end of the first winding L1, and the third end of the forward and reverse relay K3 is connected with the first end of the switching relay K2 and the first end of the second winding L2.

When the motor needs to rotate forwards, the control module 14 controls the first end of the forward and reverse rotation relay K3 to be connected with the second end of the forward and reverse rotation relay K3, when the motor needs to rotate backwards, the control module 14 controls the first end of the forward and reverse rotation relay K3 to be connected with the third end of the forward and reverse rotation relay K3, when the motor needs to rotate forwards or reversely, the control module 14 controls the forward and reverse rotation relay K3 to be closed to a forward rotation state or a reverse rotation state as required, the control module 14 sends a closing instruction of the solid state relay K1, when the solid state relay K1 detects that the voltage is zero, zero voltage closing is realized by automatic voltage conduction, no impact current is generated in a circuit, when the control module 14 detects that the motor-driven valve reaches a position, the control module sends an opening instruction of the solid state relay K1, when the solid state relay K1 detects that the current is zero, zero current is automatically turned off, and when the control module 14 detects that the solid state relay K1 is turned off, and the forward and reverse rotation relay K3 is closed after the preset time, so that no impact current is generated in the forward and reverse rotation relay K3, and the service life of the forward and reverse rotation relay K3 is effectively prolonged.

Wherein, the solid-state relay K1 is a contactless relay, rely on the electricity of semiconductor device and electronic component, magnetism and light characteristic to finish its isolation and relay switching function, compare with mechanical relay, it is a kind of relay without machinery, does not contain moving spare part, there is no mechanical wear, will not produce the electric arc either when opening and closing, but have the same function with mechanical relay essence, the relay K3 of positive and negative rotation is a mechanical relay, the mechanical relay can't detect the voltage and current of the electric wire netting, therefore, when the mechanical relay is closed or opened, produce the electric arc and will seriously influence the contact life of the relay, and impact and influence the operation of peripheral electrical apparatus to the electric wire netting, but the solid-state relay K1 is costly, unfavorable to use in batches, in this embodiment, use the contactless relay to connect the mechanical relay in series, make the contactless relay control the cut-off of the on commercial power, the zero-voltage closing and zero-current disconnection of the circuit are realized, forward and reverse rotation control is completed through the mechanical relay before the contactless relay is closed, so that no electric arc is generated when the mechanical relay is closed or disconnected, the cost is reduced, the service life of the mechanical relay is prolonged, and the design life of the whole control circuit is prolonged.

Alternatively, fig. 5 is a schematic diagram of a motor reverse rotation structure of a four-way valve according to a fourth embodiment of the present application, and as shown in fig. 5, a relay module 12 in the control circuit is different from the relay module shown in fig. 4, and for another implementation, the relay module 12 includes a forward rotation relay K4 and a reverse rotation relay K5,

a first end of the forward relay K4 is respectively connected with a second end of the forward relay K4, a second end of a first starting capacitor C1, a second end of a second starting capacitor C2 and a first end of a first winding L1, a third end of the forward relay K4 is respectively connected with a third end of a first power interface A and a third end of a reverse relay K5, and a first end of the reverse relay K5 is respectively connected with a second end of a reverse relay K5 and a first end of a switching relay K2;

as shown in fig. 5, the switch at the first end of the forward relay K4 is switched to the second end of the forward relay K4, the switch at the first end of the reverse relay K5 is switched to the third end of the reverse relay K5, the motor rotates in reverse, the current flows from the live wire terminal AC _ L through the first power interface a, the third end of the reverse relay K5, the first end of the reverse relay K5, the second end of the reverse relay K5 and the first end of the switching relay K2, and then is divided into two paths, and one path flows through the second end of the switching relay K2, the first starting capacitor C1, the first winding L1 and the second power interface B and then flows into the neutral wire terminal AC _ N; the other path directly flows through the second winding L2 and the second power interface B and then flows into a zero line end AC _ N, the first starting capacitor C1 leads the current in the first winding L1 to lead the phase difference of the current in the second winding L2 by 90 degrees, a rotating magnetic field is generated, induction current is generated in the motor rotor under the action of the rotating magnetic field, the current and the rotating magnetic field interact to generate electromagnetic field torque, and the motor is enabled to rotate reversely.

Fig. 6 is a schematic structural diagram of forward rotation of a motor of a four-way valve according to a fourth embodiment of the present invention, as shown in fig. 6, a switch at a first end of a forward rotation relay K4 is switched to a third end of a forward rotation relay K4, a switch at a first end of a reverse rotation relay K5 is switched to a second end of a reverse rotation relay K5, the motor rotates forward, a current flows from a live wire terminal AC _ L through a first power interface a, a third end of the forward rotation relay K4, a first end of the forward rotation relay K4, and a second end of the forward rotation relay K4, and then is divided into two paths, and one path flows through a first start capacitor C1, a second end of a switching relay K2, a first end of a switching relay K2, a second winding L2, and a second power interface B and then flows into a neutral wire terminal AC _ N; the other path of current directly flows through the first winding L1 and the second power interface B and then flows into a zero line end AC _ N, the first starting capacitor C1 leads the current in the second winding L2 to lead the phase difference of the current in the first winding L1 by 90 degrees, a rotating magnetic field is generated, induction current is generated in a motor rotor under the action of the rotating magnetic field, the current and the rotating magnetic field interact to generate electromagnetic field torque, and the motor rotates forwards.

In some embodiments, fig. 7 is a schematic structural diagram of a connection between a control circuit of a four-way valve according to a fifth embodiment of the present disclosure and a single-phase motor and a power module, as shown in fig. 7, the control circuit further includes an acquisition module 16, a first end of the acquisition module 16 is connected to a live line terminal AC _ L of the power module 11 through a first power interface a, a fourth end of the acquisition module 16 is connected to a neutral line terminal AC _ N of the power module 11 through a second power interface B, a second end of the acquisition module 16 is connected to a third end of a forward relay K4 and a third end of a reverse relay K5, respectively, the third end of the acquisition module 16 is connected to a second end of a first winding L1 and a second end of a second winding L2, and a fifth end of the acquisition module 16 is connected to the control module 14, as shown in fig. 7, a switch at the first end of the forward relay K4 is switched to a second end of a forward relay K4, the switch of the first end of the reverse relay K5 is switched to the third end of the reverse relay K5, the motor is reversed, and in the case of the reverse motor, the control module 14 controls the reverse relay K5 to be switched on or switched off according to the signal collected by the collecting module 16, wherein the collected signal is a signal with zero voltage or current.

In some embodiments, fig. 8 is a schematic structural diagram of a control circuit of a four-way valve according to a sixth embodiment of the present application, which is connected to a single-phase motor and a power module, as shown in fig. 8, the collecting module 16 includes a voltage collecting module 162 and a current collecting module 161,

a first end of the voltage acquisition module 162 is connected with a second power interface B through a first resistor R1, the second power interface B is connected with a zero line end AC _ N of the power module 11, a second end of the voltage acquisition module 162 is connected with a live line end AC _ L of the power module 11 through a first power interface a, and a third end of the voltage acquisition module 162 is connected with the control module 14; the first end of the current collection module 161 is connected with the live wire end AC _ L of the power module 11 through the first power interface a, the second end of the current collection module 161 is connected with the third end of the forward relay and the third end of the reverse relay respectively, the third end of the current collection module 161 is connected with the control module 14, as shown in fig. 7, the switch at the first end of the forward relay K4 is switched to the second end of the forward relay K4, the switch at the first end of the reverse relay K5 is switched to the third end of the reverse relay K5, the motor rotates reversely, the control module 14 controls the reverse relay K5 to be closed when the voltage collected by the voltage collection module 162 is zero, the control module 14 controls the reverse relay K5 to be opened when the current collected by the current collection module 161 is zero, and after the voltage collection module 162 and the current collection module 161 are added, the forward relay K4 and the reverse relay K5 can both realize zero-voltage closing zero-current opening, the service life of the relay is prolonged, the working temperature range of the relay is not limited by the fact that the ring temperature of the solid-state relay K1 is lower than 75 ℃, and the relay can work in a harsher environment.

In some embodiments, the locked-rotor detection module 15 includes a hall sensor, and the control module 14 determines the operation state of the motor according to a hall signal fed back by the hall sensor. In this embodiment, when the hall sensor detects that the magnetic pole of the motor rotor is changed (from N pole to S pole or from S pole to N pole), the generated digital signal, i.e., the hall signal, jumps, and the control module 14 can determine the operating state of the motor according to the hall signal fed back by the hall sensor.

In some embodiments, fig. 9 is a block diagram of a four-way valve according to the present application, as shown in fig. 9, the control circuit also comprises a surge protection module 17 and an auxiliary power supply module 19, the motor 18 comprises a first winding L1 and a second winding L2, the surge protection module 17 is connected between a live wire end AC _ L of the power supply module 11 and a null wire end AC _ N of the power supply module 11 through a first power supply interface A and a second power supply interface B, one end of the surge protection module 17 is connected with the first power supply interface A, the other end of the surge protection module 17 is connected with the second power supply interface B, the first end of the auxiliary power supply module 19 is connected with the surge protection module 17, the second end of the auxiliary power supply module 19 is connected with the control module 14, the auxiliary power supply module 19 is configured to convert ac mains supply into dc voltage, and step down the dc voltage to supply power to the control module 14. In this embodiment, the surge is a peak value exceeding a stable value instantaneously, and includes surge voltage and surge current, the surge of the power supply system mainly comes from lightning, the start and stop of electrical equipment, faults and the like, the surge is often short in time, but the instantaneous voltage and current are extremely large, and the surge protection module 17 can be turned on and shunted in extremely short time, so that damage of the surge to other equipment in the loop is avoided.

Optionally, the auxiliary power module 19 includes a rectifier bridge, a transformer and an LDO chip, a first end of the rectifier bridge is connected to the surge protection module 17, a second end of the rectifier bridge is connected to a first end of the transformer, a second end of the transformer is connected to a first end of the LDO chip, and a second end of the LDO chip is connected to the control module 14. In this embodiment, the ac mains supply is converted into the high-voltage dc voltage after passing through the rectifier bridge, the high-voltage dc voltage outputs a 12V low-voltage dc voltage through the transformer, and the 12V low-voltage dc voltage is stepped down to 3.3V through the LDO (low dropout regulator) chip to supply power to the control module 14.

The present embodiment further provides a control method, which is applied to the control circuit in the foregoing embodiment, and the method includes:

the first end of switching relay K2 is connected with the second end of switching relay K2, be arranged in being connected to first start electric capacity C1 to control circuit, control module 14 monitors the running state of motor through locked rotor detection module 15, if detect motor locked rotor, control module 14 closes the power, cut off the motor power supply, control module 14 sends switching instruction to switching relay K2, switching relay K2 switches second start electric capacity C2 and is connected to control circuit, after restarting the motor, if the running state of motor is normal, then first start electric capacity C1 trouble, if the running state of motor is unusual, then the motor trouble, be favorable to when the motor takes place locked rotor quick positioning to start electric capacity trouble or motor trouble, repair efficiency has been improved.

It should be understood by those skilled in the art that various features of the above-described embodiments can be combined in any combination, and for the sake of brevity, all possible combinations of features in the above-described embodiments are not described in detail, but rather, all combinations of features which are not inconsistent with each other should be construed as being within the scope of the present disclosure.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A four-way valve comprises a single-phase motor and a control circuit, wherein the single-phase motor comprises a first winding and a second winding, the four-way valve is provided with a first power interface and a second power interface, and the first power interface and the second power interface are used for being connected with a power module; it is characterized in that the control circuit comprises a control module, a control switch, a locked rotor detection module and a starting capacitor module,

the control module is respectively connected with the control switch and the locked rotor detection module, a first end of the control switch is respectively connected with the first power interface and a first end of the second winding, a second end of the control switch is connected with a first end of the starting capacitor module, a third end of the control switch is connected with a second end of the starting capacitor module, a third end of the starting capacitor module is connected with a first end of the first winding, a second end of the first winding and a second end of the second winding are both connected with the second power interface, and the locked rotor detection module is connected with the single-phase motor and used for detecting the running state of the single-phase motor;

2. The four-way valve according to claim 1, wherein the control switch is a switching relay, and the first start capacitor is connected to the control circuit if the first terminal of the switching relay is connected to the second terminal of the switching relay, and the second start capacitor is connected to the control circuit if the first terminal of the switching relay is connected to the third terminal of the switching relay, comprising:

a second end of the switching relay is connected with a first end of the first starting capacitor, a third end of the switching relay is connected with a first end of the second starting capacitor, and a second end of the first starting capacitor and a second end of the second starting capacitor are respectively connected with a first end of the first winding;

the control module controls the first end of the switching relay to be selectively connected with the second end of the switching relay or the third end of the switching relay, the first starting capacitor is connected into the control circuit under the condition that the first end of the switching relay is connected with the second end of the switching relay, and the second starting capacitor is connected into the control circuit under the condition that the first end of the switching relay is connected with the third end of the switching relay.

3. The four-way valve according to claim 1, wherein the control switch is a switching relay, the control circuit further comprises a relay module comprising a solid state relay and a forward and reverse relay,

the first end of the solid-state relay is connected with the first power interface, the second end of the solid-state relay is connected with the first end of the forward and reverse relay, the second end of the forward and reverse relay is respectively connected with the second end of the first starting capacitor, the second end of the second starting capacitor and the first end of the first winding, and the third end of the forward and reverse relay is respectively connected with the first end of the switching relay and the first end of the second winding.

4. The four-way valve according to claim 1, wherein the control switch is a switching relay, the control circuit further comprises a relay module comprising a forward relay and a reverse relay,

the first end of the forward rotation relay is connected with the second end of the forward rotation relay, the second end of the first starting capacitor, the second end of the second starting capacitor and the first end of the first winding respectively, the third end of the forward rotation relay is connected with the first power interface and the third end of the reverse rotation relay respectively, and the first end of the reverse rotation relay is connected with the second end of the reverse rotation relay and the first end of the switching relay respectively.

5. The four-way valve of claim 4, wherein the control circuit further comprises an acquisition module,

the first end of the acquisition module is connected with the first power interface, the fourth end of the acquisition module is connected with the second power interface, the second end of the acquisition module is respectively connected with the third end of the forward relay and the third end of the reverse relay, the third end of the acquisition module is respectively connected with the second end of the first winding and the second end of the second winding, and the fifth end of the acquisition module is connected with the control module;

under the condition that the single-phase motor rotates forwards, the control module controls the forward rotation relay to be switched on or switched off according to the signal acquired by the acquisition module;

and under the condition that the single-phase motor rotates reversely, the control module controls the reverse relay to be switched on or switched off according to the signal acquired by the acquisition module.

6. The four-way valve according to claim 5, wherein the collection module comprises a voltage collection module and a current collection module,

the first end of the voltage acquisition module is connected with the second power interface through a first resistor, the second end of the voltage acquisition module is connected with the first power interface, and the third end of the voltage acquisition module is connected with the control module;

the first end of the current collection module is connected with the first power interface, the second end of the current collection module is respectively connected with the third end of the forward relay and the third end of the reverse relay, and the third end of the current collection module is connected with the control module;

the control module controls the forward relay or the reverse relay to be closed according to the condition that the voltage acquired by the voltage acquisition module is zero, and controls the forward relay or the reverse relay to be disconnected according to the condition that the current acquired by the current acquisition module is zero.

7. The four-way valve according to any one of claims 1 to 6, wherein the stalling detection module comprises a Hall sensor, and the control module judges the running state of the single-phase motor according to a Hall signal fed back by the Hall sensor.

8. The four-way valve according to any one of claims 1 to 6, wherein the first power interface is used for being connected with a live wire end of the power module, the second power interface is used for being connected with a zero wire end of the power module, and the power module is an external power module or a power module internally arranged in the four-way valve.

9. The four-way valve according to any one of claims 1 to 6, wherein the control circuit further comprises a surge protection module and an auxiliary power module, the surge protection module is connected between the first power interface and the second power interface, a first end of the auxiliary power module is connected with the surge protection module, a second end of the auxiliary power module is connected with the control module, and the auxiliary power module is configured to convert an alternating current mains supply into a direct current voltage and supply power to the control module after the direct current voltage is reduced.