CN1971052A - Variable capacity compressor and method of operation thereof - Google Patents

Abstract

The invention discloses a compressor with variable capacity. The drive motor is installed inside the casing. The first compression unit and the second compression unit receive the driving force of the drive motor and compress refrigerant respectively. The bypass pipe is connected between the first compression unit and the second compression unit. In the second compression unit, the suction side and the discharge side are connected, the opening and closing valve is installed in the bypass pipe and the bypass pipe is opened and closed, the valve motor moves the opening and closing valve, and the control unit controls the opening and closing interval of the valve motor. Also disclosed is an operating method of a variable capacity compressor, including the step of detecting the load, and also including the step of selecting one of the high capacity mode, the variable capacity mode and the low capacity mode accordingly, and operating it. Through the present invention A variety of compression capacities can be realized, thereby reducing the power consumption and correspondingly improving efficiency.

Description

Variable capacity compressor and method of operation thereof

technical field

The present invention relates to a variable capacity compressor, in particular to a variable capacity compressor capable of variously changing the compression capacity of compressed refrigerant according to changes in external loads and an operating method thereof.

Background technique

Prior art air conditioners, refrigerators, display cabinets, etc. are provided with a refrigerating cycle system, which includes a compressor, a condenser, an expansion valve, and an evaporator. The compressor compresses the refrigerant, and the condenser condenses the compressed refrigerant in the compressor. And discharge heat to the outside, the expansion valve reduces the pressure of the refrigerant condensed in the condenser, and the evaporator evaporates the refrigerant passing through the expansion valve and absorbs external heat. Among them, the compressor, condenser, expansion valve and evaporator are connected through connecting pipes and form a circulation device.

In the above-mentioned refrigeration cycle system, after the power is turned on, the compressor is driven to start, and the high-temperature and high-pressure refrigerant discharged from the compressor will pass through the condenser, expansion valve, and evaporator in sequence, and then be sucked into the compressor, and the above process will be repeated. . During this process, heat is generated in the condenser, while external heat is absorbed in the evaporator and cold air is generated.

In the above-mentioned refrigerator and display cabinet, the cold air generated in the evaporator of its refrigeration cycle system can be used to keep the food stored inside in a fresh state. In addition, the air conditioner selectively circulates the heat generated in the condenser of the refrigeration cycle system and the cold air generated in the evaporator into the room, thereby maintaining a comfortable state in the room.

The above-mentioned refrigerators and showcases are always used regardless of seasonal changes, but the air conditioners are used differently according to seasonal changes.

For example, air conditioners are used more in summer, but less in spring and autumn. Since the amount of usage thereof varies greatly according to summer, spring and autumn, it is possible to reduce the electric energy consumed in the air conditioner to a great extent by switching over the appropriate operation mode.

In particular, recently, with the increasing use of crude oil worldwide, the price of crude oil has also increased. Therefore, it is necessary to develop an air conditioner that minimizes the consumption of electric energy, and when the air conditioner consumes When the electric energy of the air conditioner reaches the minimum, the environmental problems caused by the use of the air conditioner can be correspondingly reduced.

The refrigeration capacity of the refrigeration cycle system will depend on the compression capacity of the compressed refrigerant in the compressor. The greater the compression capacity of the compressor, the more cold air will be generated in the evaporator of the refrigeration cycle system; the compression capacity of the compressor will be greater. The smaller the capacity, the less cold air is produced in the evaporator.

Therefore, in order to effectively operate the refrigeration cycle system, according to different situations, when more cold air is needed, the compression capacity of the compressor will be increased; and when less cold air is needed, the compression capacity of the compressor will be reduced accordingly. capacity.

The compressor in the prior art includes an electric structural part and a compression structural part. The electric structural part converts electric energy into kinetic energy. The compression structural part receives the rotational force of the electric structural part and compresses the refrigerant. One of the ways for the compressor to change the compression capacity is to change the number of revolutions of the electric structural parts. However, if the number of revolutions of the electric structural parts is to be changed, the price of the electric structural parts will be high, so that the price of the compressor will increase correspondingly, and the competitiveness of the product will be reduced.

Therefore, it is necessary to develop a compressor capable of changing the compression capacity of the refrigerant in the compression structural part while keeping the rotational speed of the electric structural part at a constant value.

As one of the methods of changing the compression capacity of the refrigerant in the compressor, two compression units for compressing the refrigerant can be provided, and a piping system can be formed at the same time, and the two compression units can be selectively connected in series or in parallel. When the compression capacity of the compressor needs to be increased, the two compression units are connected in parallel; when the compression capacity of the compressor needs to be reduced, the two compression units are connected in series.

However, the methods for changing the refrigerant compression capacity in the prior art are limited to two or three types. That is, three situations may arise. The first situation is to connect two compression units in parallel and compress the refrigerant in the two compression units separately. The second situation is to connect the two compression units in series and compress the refrigerant in the two compression units. The refrigerant is continuously compressed in the unit, and the third case is to set the compression capacities of the two compression units to different capacities, etc. Therefore, in the method of the prior art, the refrigerant compression capacity is limited to two or three types, therefore, it is impossible to compress the refrigerant with various compression capacities according to various changes in the external air, that is, changes in the load, resulting in a reduction in product quality. s efficiency.

Moreover, in the prior art method, the piping system connecting the two compression units will become more complicated, and its overall shape will also increase accordingly, resulting in increased manufacturing costs. Much space, and limited by the installation space.

Contents of the invention

The technical problem to be solved by the present invention is to provide a variable capacity compressor and its operation method, which can change the compression capacity for compressing refrigerant in various ways according to the change of external load.

In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:

As a variable capacity compressor of the present invention, it includes a driving motor, a first compression unit, a second compression unit, a bypass pipe, an opening and closing valve, a valve motor and a control unit, and the driving motor is installed inside the casing. The first compression unit and the second compression unit receive the driving force of the drive motor, and compress the refrigerant respectively. The bypass pipe is in the first compression unit and the second compression unit, and communicates with the suction side of one of the compression units to suck the refrigerant and from the compression unit. On the discharge side where the refrigerant is discharged, the opening and closing valve is installed in the bypass pipe and opens and closes the bypass pipe. The valve motor moves the opening and closing valve. The control unit controls the driving time interval and the stopping time interval of the valve motor.

As an operation method of a variable capacity compressor of the present invention, in the variable capacity compressor of the present invention, a driving motor, a first compression unit and a second compression unit are included, and the first compression unit and the second compression unit Receiving the driving force of the driving motor and compressing the refrigerant respectively, the operation method of the variable capacity compressor includes a step for detecting the load, and also includes switching from the high capacity mode, the variable capacity mode and the low capacity mode according to the detected load. Select a mode in the capacity mode and perform the operation steps. The high capacity mode continuously compresses the refrigerant in the two compression units, and the variable capacity mode continuously compresses the refrigerant in one of the two compression units, while the other compresses the refrigerant continuously. In the compression unit, the time interval of compressing the refrigerant and the time interval of not compressing the refrigerant are changed, and the low capacity mode compresses the refrigerant in only one of the two compression units.

The beneficial effects of the present invention are:

In the variable capacity compressor and its operating method of the present invention, various refrigerant compression capacities can be generated according to load changes within a set range, thereby reducing consumed electric energy and improving product efficiency.

Description of drawings

Fig. 1 is the main sectional view of an example of the capacity variable compressor of the present invention;

Fig. 2 is a flow chart of the operation method of the variable capacity compressor of the present invention;

Figure 3 is a sectional view of the high capacity mode operation state of the variable capacity compressor of the present invention

4 is a cross-sectional view of the operating state of the low capacity mode of the variable capacity compressor of the present invention;

In the picture:

20: Drive motor 150: Control unit

151: Bypass pipe 152: Open and close valve

153: Valve motor 154: Torsion spring

155: motor shaft

Detailed ways

The variable capacity compressor and its operating method of the present invention will be further described in detail in conjunction with the accompanying drawings and specific embodiments:

Fig. 1 is a front sectional view of an example of a variable capacity compressor of the present invention, and Fig. 2 is a flow chart of an operating method of the variable capacity compressor of the present invention.

As shown in the figure, in the variable capacity compressor of the present invention, a drive motor 20 is installed on the inner upper side of the casing 10 having a predetermined shape, and the drive motor 20 generates rotational force. Compression unit, the first compression unit is installed inside the casing 10, and receives the rotational force of the drive motor 20, and compresses the refrigerant. In addition, a second compression unit is installed under the first compression unit, and the second compression unit receives the drive motor 20 rotation force, and compress the refrigerant.

Moreover, the first compression unit is provided with a first discharge unit for discharging the refrigerant compressed in the first compression unit, and the second compression unit is provided with a second discharge unit for discharging the refrigerant compressed in the second compression unit. Two discharge units, the second discharge unit is used to discharge the refrigerant compressed in the second compression unit.

An oil accumulator 30 is provided on the side of the housing 10, and the oil accumulator 30 is used to vaporize the refrigerant. In order to guide the refrigerant passing through the oil accumulator 30 to flow into the first compression unit, the first inflow pipe 11 will be connected with the oil accumulator 30 and The first compression unit is connected. And, in order to guide the refrigerant passing through the accumulator 30 to flow into the second compression unit, the second inflow pipe 12 is connected to the accumulator 30 and the second compression unit.

The upper part of the housing 10 is combined with a discharge pipe 13 for discharging the compressed gas to the outside of the housing 10 .

The drive motor 20 includes a stator 21 and a rotor 22 , the stator 21 is mounted inside the casing 10 and provided with a coil C, and the rotor 22 is rotatably inserted into the stator 21 .

A rotating shaft 40 is press-fitted into the rotor 22. The rotating shaft 40 includes a shaft portion 41, a first eccentric portion 42, and a second eccentric portion 43. The shaft portion 41 has a predetermined length, and the first eccentric portion 42 has a certain thickness and outer shape. The second eccentric part 43 has a certain thickness and outer diameter, is formed by extending from the shaft part 41, and is formed with the The axis of the portion 41 is in an eccentric state. Wherein, the first eccentric part 42 is disposed on the upper side of the second eccentric part 43 , and there will be a certain distance between the eccentric parts 42 and 43 .

The first compression unit includes a first cylinder 50, a first eccentric portion 42, a first vane 60, an upper bearing 70 and an intermediate plate 80, the first cylinder 50 is installed inside the casing 10, and the first eccentric portion 42 is arranged on the first The rotating shaft of the inner space of the cylinder 50, the first vane 60 can be slidably inserted in the first cylinder 50, and divides the inner space of the first cylinder 50, and the upper bearing 70 is combined with the upper part of the first cylinder 50 to close the first cylinder 50 The inner space of the inner space, and supports the rotating shaft 40 , and the middle plate 80 is combined with the lower part of the first cylinder 50 . Wherein, the first blade 60 is elastically supported by a spring 61 .

A suction hole 51 is formed in the first cylinder 50 , and the first inflow pipe 11 is connected to the suction hole 51 so as to communicate with an inner space of the first cylinder 50 .

The second compression unit includes a second cylinder 90, a second eccentric portion 43, a second vane 100 and a lower bearing 110, the second cylinder 90 is installed inside the housing 10, and the second eccentric portion 43 is arranged inside the second cylinder 90 The rotation axis of the space, the second vane 100 can be slidably inserted on one side of the second cylinder 90, and divides the inner space of the second cylinder 90, the lower bearing 110 is combined with the lower part of the second cylinder 90, and closes the inside of the second cylinder 90 space, and supports the rotating shaft 40. Wherein, an intermediate plate 80 is arranged on the upper surface of the second cylinder 90 , and the intermediate plate 80 will close the inner space of the second cylinder 90 . And, the second blade 100 will be elastically supported by the spring 101 .

A suction hole 91 is formed in the second cylinder 90 , and the second inflow pipe 12 is connected to the suction hole 91 so as to communicate with the inner space of the second cylinder 90 .

The first discharge unit includes a discharge hole 71 and a first discharge valve 72 , the discharge hole 71 is formed on the upper bearing 70 , and the first discharge valve 72 is installed on the upper bearing 70 to open and close the discharge hole 71 .

The second discharge unit includes a cavity box 130, a discharge flow path 111, a communication flow path F and a second discharge valve 140. The cavity box 130 is installed on the lower bearing 110, and a cavity S is formed inside it, and the discharge flow path 111 It is formed through the lower bearing 110 and communicates with the inner space of the second cylinder 90 and the cavity S. The communication channel F communicates with the cavity S and the inside of the housing 10 . The second discharge valve 140 opens and closes the communication channel F.

The communication flow path F is constituted by a through-hole formed through the first and second compression units. That is, the communication flow path F is constituted by a through hole passing through the lower bearing 110 , the second cylinder 90 , the intermediate plate 80 , the first cylinder 50 , and the upper bearing 70 . In addition, the second discharge valve 140 is attached to the upper surface of the upper bearing 70 in order to open and close the through hole as described above.

A bypass pipe 151 is connected between the cavity S and the second inflow pipe 12, and the bypass pipe 151 communicates with the suction side of the second compression unit and the discharge side of the second compression unit. Moreover, the bypass pipe 151 is formed by bending, one side of which is fixedly combined with the cavity box 130 , and the other side is fixedly combined with the second inflow pipe 12 .

In addition, an opening and closing unit is provided in the present invention, and the opening and closing unit opens and closes the bypass pipe 151 , and the opening and closing operation of the bypass pipe 151 is controlled by the opening and closing unit. Moreover, a control unit 150 is also provided in the present invention, and the control unit 150 controls the time interval for opening the bypass pipe 151 and the time interval for closing the bypass pipe 151 .

The opening and closing unit includes an opening and closing valve 152, a valve motor 153 and a torsion spring 154. The opening and closing valve 152 controls the flow state of the refrigerant flowing to the bypass pipe 151. The valve motor 153 moves the opening and closing valve 152, and the torsion spring 154 combines On the motor shaft of the valve motor 153.

Among them, the control unit 150 is composed of a printed circuit board using a pulse width modulation method.

The present invention also includes rolling pistons 45 , 46 and muffler 120 .

Fig. 2 is a flow chart of an embodiment of the operation method of the variable capacity compressor of the present invention.

As shown in the figure, the operation method of the variable capacity compressor in the present invention includes the following steps: a step for detecting the load; according to the detected load, the high capacity mode, variable capacity mode and Select a mode from low capacity mode and perform the operation steps. The high-capacity mode continuously compresses the refrigerant in each of the two compression units, and the variable capacity mode continuously compresses the refrigerant in one of the two compression units, while changing the time interval of compressing the refrigerant and not compressing the refrigerant in the other compression unit The low capacity mode compresses the refrigerant in only one of the two compression units.

The load can be determined by an operator's setting operation, or can be determined by a sensor detecting an external temperature.

The variable capacity mode includes: a step of detecting a load and generating a control signal; in order to drive the valve motor 153 for opening and closing the bypass pipe 151 according to the control signal, a step of generating a motor drive signal; The step of driving the valve motor 153 and adjusting the opening and closing time interval of the bypass pipe 151 . Among them, the bypass pipe 151 selectively opens and closes the suction side of the compression unit and the discharge side of the compression unit that perform the refrigerant compression operation.

The maximum compression capacities for compressing the refrigerant in the two compression units may be set to the same capacity or different capacities.

When the valve motor 153 is driven, it rotates in a direction against the torsion force of the torsion spring 154 coupled to the motor shaft 155 of the valve motor 153 . When the valve motor 153 stops driving, it returns to the initial position by the restoring force of the torsion spring 154 .

Next, the operation and effect of the capacity variable compressor and its operating method in the present invention will be described.

First, when the refrigerant is compressed simultaneously in the first compression unit and the second compression unit, that is, when operating in the high-capacity mode, the valve motor 153 is driven and operated, and the bypass pipe 151 is closed by the on-off valve 152 , the compressor will operate.

When the compressor is powered on, a rotational force is generated in the driving motor 20, and the rotational force of the driving motor 20 is transmitted to the rotating shaft 40, so that the rotating shaft 40 rotates.

When the rotating shaft 40 rotates, the first eccentric part 42 and the second eccentric part 43 of the rotating shaft 40 will be in the internal space of the first cylinder 50 and the internal space of the second cylinder 90 respectively, with the shaft center of the shaft part 41 as Rotate the shaft, making a circular motion. As the first eccentric part 42 performs circular motion in the inner space of the first cylinder 50, as shown in FIG. , and compressed, the compressed refrigerant is discharged into the housing 10 through the discharge hole 71 as the first discharge valve 72 is opened. At the same time, as the second eccentric part 43 performs circular motion in the inner space of the second cylinder 90, the volume of the inner space divided by the second blade 100 will change, so that the refrigerant is sucked through the second inflow pipe 12, And compressed, the compressed refrigerant is discharged to the inside of the casing 10 through the discharge flow path 111 , the cavity S and the communication flow path F as the second discharge valve 140 is opened.

The high-temperature and high-pressure refrigerant discharged into the casing 10 is discharged to the outside of the casing 10 through the discharge pipe 13 .

In addition, when the bypass pipe 151 is blocked by the opening and closing valve 152, the refrigerant flowing through the second inflow pipe 12 can be prevented from flowing into the cavity S through the bypass pipe 151, and at the same time, it can be prevented from being discharged from the second compression unit. The refrigerant that has flowed into the chamber S flows toward the second inflow pipe 12 side.

As mentioned above, in the high-capacity mode, the first compression unit and the second compression unit respectively continue to compress the refrigerant, thereby increasing the compression capacity of the compressed refrigerant.

In addition, when the refrigerant is continuously compressed in the first compression unit but not continuously compressed in the second compression unit, that is, when operating in a low-capacity mode, the valve motor 153 will stop operating, and the valve 152 will be opened and closed. The torsion spring 154 moves to the initial position, so that the on-off valve 152 opens the bypass pipe 151 .

Thus, in the first compression unit, as in the high-capacity mode, the refrigerant sucked into the first compression unit through the first inflow pipe 11 is compressed in the first compression unit as shown in FIG. 4 and discharged to the shell. The interior of the body 10.

Also, in the second compression unit, since the bypass pipe 151 connecting the second inflow pipe 12 on the suction side, which is the suction of the refrigerant, and the cavity S on the discharge side, which is the discharge of the refrigerant, is in an open state, the side of the second inflow pipe 12 and the chamber S on the discharge side are opened. The pressure on the side of the cavity S will be the same, so that no compression operation is performed in the second compression unit and the second eccentric portion 43 of the rotating shaft is idled. That is, since the pressure on the suction side and the discharge side are the same, even if there is a volume change in the inner space of the second cylinder 90, the refrigerant sucked into the inner space of the second cylinder 90 will not be compressed, but will be directly discharged, and passed through the bypass pipe 151 Then flow into the second compression unit, and repeat the above process.

As described above, in the low-capacity mode, the refrigerant is compressed in the first compression unit, and the refrigerant is not compressed in the second compression unit, thereby reducing the compression capacity of the compressed refrigerant.

In addition, when the refrigerant is continuously compressed in the first compression unit, and the time interval for compressing the refrigerant and the time interval for not compressing the refrigerant are changed in the second compression unit, that is, when operating in the variable capacity mode, at the first compression In the unit, the refrigerant is continuously compressed and discharged into the casing in the same manner as described above. At the same time, the compression time interval for compressing the refrigerant and the non-compression time interval for not compressing the refrigerant are adjusted in the second compression unit, thereby adjusting the amount of refrigerant compressed in the second compression unit, thereby adjusting the first compression unit and the second compression unit The total amount of compressed refrigerant.

Next, the process of adjusting the compression time interval for compressing the refrigerant and the non-compression time interval for not compressing the refrigerant in the second compression unit will be described.

When the valve motor 153 is driven, the opening and closing valve 152 will be driven by the valve motor 153 to block the bypass pipe 151 , so that the second compression unit compresses the refrigerant and discharges it into the shell 10 . And, when the valve motor 153 stops driving, the opening and closing valve 152 will be moved to the initial position by the torsion force of the torsion spring 154, and the bypass pipe 151 will be opened to communicate with the suction side and the discharge side of the second compression unit, so that the second compression unit Compression operations are not performed in the compression unit. Thus, by adjusting the interval between the driving time and the stopping time of the valve motor 153, the amount of refrigerant compressed and discharged in the second compression unit can be adjusted.

The variable capacity compressor will constitute a refrigeration cycle system, and the refrigeration cycle system including the variable capacity compressor will be installed in air conditioners and other devices.

Wherein, when a load acts on the variable capacity compressor, the applied load will be detected, and when the detected load T is higher than the set value a, the high capacity mode will be operated. When the detected load is lower than the set value b, it will operate in low capacity mode. When the detected load is between the two set values a, b, it operates in variable capacity mode. In the variable capacity mode, adjust the time interval ratio of the valve motor 153 to open and close periodically, that is, adjust the amount of refrigerant compressed in the second compression unit by adjusting the duty ratio. In the duty cycle, when the opening ratio of the valve motor 153 is increased, the amount of refrigerant compression will increase; when the opening ratio of the valve motor 153 is decreased, the amount of refrigerant compression will be reduced. Thus, the change state is detected according to the change of the load, and the duty ratio is adjusted through the control operation of the control unit, and the compression capacity of the refrigerant is adjusted.

As described above, various compression capacities can be realized in the present invention ranging from the compression capacity for simultaneously compressing the refrigerant in two compression units to the compression capacity for compressing the refrigerant in only one compression unit.

Furthermore, in the variable capacity compressor of the present invention, the refrigerant can be compressed in two compression units at the same time, or can be compressed in only one compression unit, or can be compressed in two compression units at the same time, and can be compressed in one compression unit. The compression capacity of refrigerant compression in the compression unit can be changed. Compared with two compression units connected in series or in parallel in the prior art, the present invention has a relatively simpler structure and makes the overall size smaller. That is, in the present invention, the connecting pipe provided outside the housing can be minimized, thereby reducing the overall size, thereby reducing the installation space of the compressor and facilitating installation.

As described in detail above, in the variable capacity compressor and its operating method of the present invention, various refrigerant compression capacities can be generated according to load changes within a set range, thereby reducing the consumed electric energy and improving product efficiency.

Claims (7)

1. A variable capacity compressor, characterized in that: the variable capacity compressor includes a driving motor (20), a first compression unit, a second compression unit, a bypass pipe (151), an opening and closing valve (152 ), the valve motor (153) and the control unit (150), the driving motor (20) is installed inside the housing (10), the first compression unit and the second compression unit receive the driving force of the driving motor (20), and compress Refrigerant, the bypass pipe (151) connects the suction side and the discharge side in the first compression unit and the second compression unit, the suction side selectively sucks the refrigerant into one compression unit, and the discharge side discharges the refrigerant from the compression unit, opening and closing the valve (152) is installed in the bypass pipe (151), and opens and closes the bypass pipe (151), the valve motor (153) moves the opening and closing valve (152), and the control unit (150) controls the movement of the valve motor (153) Drive time interval and stop time interval. 2. The variable capacity compressor according to claim 1, characterized in that: the motor shaft (155) of the valve motor (153) is provided with a torsion spring (154). 3. A method for operating a variable capacity compressor. In the variable capacity compressor of the present invention, it includes a driving motor, a first compression unit and a second compression unit, and the first compression unit and the second compression unit receive the driving motor driving force, and respectively compressing the refrigerant, it is characterized in that: the operation method of the variable capacity compressor includes a step of detecting the load, and also includes switching from the high capacity mode to the variable capacity mode according to the detected load The steps of selecting one of the modes from the low capacity mode and the low capacity mode and performing the operation, the high capacity mode continuously compresses the refrigerant in the two compression units respectively, the variable capacity mode continuously compresses the refrigerant in one of the two compression units, and Change the time interval of compressing the refrigerant in the other compression unit and the time interval of not compressing the refrigerant, and the low capacity mode compresses the refrigerant in only one of the two compression units. 4. The operation method of variable capacity compressor according to claim 3, characterized in that: said variable capacity mode includes three steps of generating control signal, generating motor driving signal and adjusting opening and closing time interval, in generating control In the signal step, the load is detected and a control signal is generated. In the step of generating a motor drive signal, in order to drive the valve motor (20) used to open and close the bypass pipe (151) according to the control signal, a motor drive signal will be generated. In the closing time interval step, the valve motor (20) is driven by the motor drive signal, and the opening and closing time interval of the bypass pipe (151) is adjusted. 5. The operation method of variable capacity compressor according to claim 4, characterized in that: when the bypass pipe (151) is closed, the compression unit performs refrigerant compression operation, and when the bypass pipe (151) is opened , stop the refrigerant compression operation in the compression unit. 6. The operation method of the variable capacity compressor according to claim 4, characterized in that: the maximum compression capacity of the refrigerant compressed in the first compression unit and the second compression unit are different. 7. The operation method of variable capacity compressor according to claim 4, characterized in that: when the valve motor (20) is driven, the motor shaft (155) to overcome the valve motor (20) is combined with The direction of the torsion force of the torsion spring (154) rotates, and when the valve motor (20) stops driving, it will move to the initial position by the restoring force of the torsion spring (154).

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