Equivalent frequency device, compressor and method

Abstract

The invention provides an equivalent frequency device, a compressor and a method, and solves the technical problems that high-frequency large-current automatic frequency reduction of the compressor cannot be carried out, and a high-frequency reliability test cannot be carried out. The equivalent frequency device comprises a driving shaft, a first transmission shaft, a second transmission shaft, a relay, a piezoelectric crystal, a first transmission assembly and a second transmission assembly, a relay is arranged between the driving shaft and the second transmission shaft; the first transmission shaft is in transmission connection with the driving shaft through a first transmission assembly which can be closed and opened; the second transmission shaft and the first transmission shaft are in transmission connection through a second transmission assembly capable of being closed and opened. The piezoelectric crystal is arranged on the first transmission shaft and used for controlling the first transmission assembly and the second transmission assembly to be connected or disconnected. The transmission ratio of the first transmission assembly is 1; the transmission ratio of the second transmission assembly is N2 / N1. According to the invention, the structural part can still operate according to the target frequency when the compressor is subjected to frequency reduction due to large current in high-frequency heavy load.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to an equivalent frequency device, a compressor and a method. Background Art

[0002] With the upgrading of technology, scroll compressors are increasingly developing in the direction of high speed and large displacement. Whether the structural design of scroll compressors can meet the requirements of high speed has become a topic that needs to be studied urgently. Generally, the compressor is divided into a structural part and a motor part. The motor is responsible for driving the compressor to operate. When the motor performance cannot achieve the compressor to operate at the required frequency, the high-speed research of the compressor structure cannot be carried out. In particular, when the compressor is operated at high frequency under harsh working conditions, it is often prone to high current. Due to the limitation of the rated current of the motor, the controller will automatically reduce the frequency for the purpose of protection, resulting in the compressor unable to reach the target frequency, and the high-speed characteristics cannot be studied. The traditional solution is to develop a new current-reducing, high-performance motor to meet the requirements of high-speed drive of the compressor, and then complete the high-frequency performance and reliability research of the compressor. However, the development of a new motor requires a certain period of time, which greatly slows down the development process of the entire compressor and cannot respond to the market's urgent demand for high-speed compressors in a timely manner. Summary of the invention

[0003] The purpose of the present invention is to provide an equivalent frequency device, a compressor and a method to solve the technical problems existing in the prior art that the high frequency and large current of the compressor are automatically reduced in frequency and the high frequency reliability test cannot be carried out.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] In a first aspect, the present invention provides an equivalent frequency device, comprising a driving shaft, a first transmission shaft, a second transmission shaft, a relay, a piezoelectric crystal, a first transmission assembly, and a second transmission assembly; wherein:

[0006] The relay is arranged between the driving shaft and the second transmission shaft;

[0007] The first transmission shaft is in transmission connection with the driving shaft via the first transmission assembly which can be closed and disconnected;

[0008] The second transmission shaft and the first transmission shaft are connected in transmission via the second transmission assembly which can be closed and disconnected;

[0009] The piezoelectric crystal is arranged on the first transmission shaft to control the closing or opening of the first transmission component and the second transmission component;

[0010] The transmission ratio of the first transmission assembly is 1;

[0011] The transmission ratio of the second transmission assembly is N2 / N1.

[0012] The equivalent frequency device provided by the present invention enables the compressor pump body structure to operate at the target frequency N1 under high-frequency and heavy-load conditions. When the motor in the compressor operates at the frequency N2, the controller displays the motor operating frequency N2, but the actual pump body operates at the target frequency N1 under the action of the gear transmission. This ensures that when the compressor has a large current and reduces the frequency due to high-frequency and heavy-load conditions, the structural part can still operate at the target frequency. The high-frequency reliability and performance of the compressor can be studied, and the problem of automatic frequency reduction of the compressor due to high-frequency and large current and the inability to carry out high-frequency reliability tests can be solved.

[0013] As a further improvement of the present invention, the first transmission assembly includes a first gear and a fourth gear; the first gear is fixed on the driving shaft, and the fourth gear is fixed on the first transmission shaft; the diameter of the fourth gear is equal to the diameter of the first gear.

[0014] As a further improvement of the present invention, the second transmission assembly includes a second gear and a third gear; the second gear is fixed on the second transmission shaft, and the third gear is fixed on the first transmission shaft; the diameter ratio of the second gear diameter to the third gear diameter is N2 / N1.

[0015] As a further improvement of the present invention, it also includes a spring sleeved on the first transmission shaft, one end of the spring is fixedly connected to the first transmission shaft, and the other end abuts against the fourth gear; when the first gear and the fourth gear are meshed and connected, the spring is in a compressed state.

[0016] As a further improvement of the present invention, it also includes a lock nut movably mounted on the first transmission shaft and contactably connected to the third gear, and a through hole is provided on the lock nut; a slot is provided on the side wall of the first transmission shaft; the piezoelectric crystal passes through the through hole and is inserted into the slot, and when the piezoelectric crystal is inserted into the slot, the lock nut abuts against the third gear.

[0017] As a further improvement of the present invention, a movable gap is left between the inner wall of the lock nut and the first transmission shaft.

[0018] The equivalent frequency device of the present invention separates the compressor structure part from the motor part as a research object, creates conditions for separately studying the high-frequency characteristics of the structure, provides a way to timely discover high-frequency defects of the structure part and make targeted structural optimization adjustments, and accelerates the overall development process of the compressor.

[0019] In a second aspect, the present invention provides a compressor, comprising a pump body, a motor and the equivalent frequency device; the driving shaft in the equivalent frequency device is connected to the motor, and the second transmission shaft is connected to the crankshaft in the pump body.

[0020] The compressor of the present invention solves the research problems of high-frequency performance and reliability of the compressor structure part. When the motor cannot maintain high-frequency operation, there is no need to wait for the development of a new motor. Relying on the present invention, the high-frequency characteristics of the structure part can be investigated, which provides the possibility of timely discovering high-frequency defects of the structure part and making targeted structural optimization adjustments, greatly shortening the overall development process of the compressor, and providing a way to promote the transformation of the compressor from research and development to mass production, accelerate productization and marketization, and serve economic and social development.

[0021] In a third aspect, the present invention provides a control method for performing equivalent frequency operation control on the compressor, the method comprising the following steps:

[0022] Start the compressor, close the relay, and couple the driving shaft with the second transmission shaft to run at the same frequency;

[0023] When the compressor runs to the high frequency N1, the first transmission shaft is controlled to be coupled with the driving shaft and the second transmission shaft, and the driving shaft is disconnected from the second transmission shaft to perform equivalent same-frequency operation.

[0024] As a further improvement of the present invention, when the compressor runs to the high frequency N1, the first transmission shaft is controlled to couple with the driving shaft and the second transmission shaft, and the driving shaft is disconnected from the second transmission shaft to perform equivalent same-frequency operation, including:

[0025] Receiving a high current signal, the relay is disconnected, thereby disconnecting the driving shaft from the second transmission shaft;

[0026] The piezoelectric crystal is deformed under the action of a large current to disengage from the slot position of the first transmission shaft;

[0027] The first transmission shaft is displaced under the action of the spring, so that the first gear and the fourth gear are meshed, and the second gear and the third gear are meshed respectively, so as to realize the coupling of the first transmission shaft with the driving shaft and the second transmission shaft;

[0028] The motor is controlled to run at frequency N2, and the compressor maintains high frequency N1 operation under the transmission ratio of the equivalent frequency device.

[0029] The control method of the present invention enables the compressor pump structure to operate at the target frequency N1 under high-frequency and heavy-load conditions. When the motor in the compressor operates at the frequency N2, the controller displays the motor operating frequency N2, but the actual pump body operates at the target frequency N1 under the action of gear transmission. When the compressor is subjected to high-frequency and heavy-load conditions and a large current is generated and the frequency is reduced, the structural part can still operate at the target frequency, and the high-frequency reliability and performance of the compressor are studied. The piezoelectric sensor can be used to convert the electrical signal into a mechanical signal, and the gear transmission principle is combined to achieve the equivalent frequency operation purpose of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 It is a structural schematic diagram of an equivalent frequency device of the present invention;

[0032] Figure 2 It is a working state diagram of the equivalent frequency device of the present invention at normal current;

[0033] Figure 3 This is a working state diagram of the equivalent frequency device of the present invention at high current;

[0034] Figure 4 yes Figure 2 The partial enlarged view of I in the middle shows the piezoelectric crystal in the equivalent frequency device at normal current;

[0035] Figure 5 yes Figure 3 The enlarged partial view of J in the middle shows the piezoelectric crystal in the equivalent frequency device at high current;

[0036] Figure 6 It is a schematic structural diagram of the compressor of the present invention.

[0037] In the figure, 1 is the driving shaft; 2 is the supporting part; 31 is the first gear; 32 is the fourth gear; 4 is the relay; 5 is the second gear; 6 is the first transmission shaft; 7 is the spring; 8 is the lock nut; 81 is the through hole; 82 is the slot; 9 is the third gear; 10 is the piezoelectric crystal; 11 is the second transmission shaft; 100 is the motor; 200 is the crankshaft; 300 is the pump body; 400 is the equivalent frequency device. DETAILED DESCRIPTION

[0038] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Apparently, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other implementation manners obtained by those of ordinary skill in the art without creative efforts fall within the scope protected by the present invention.

[0039] To solve the problems in the background art, the present invention proposes a device for realizing the equivalent frequency operation of a compressor. When the compressor needs to operate at a frequency N1 under specific working conditions, a large current A1 appears in the compressor, and the controller automatically reduces the frequency to N2 for protection. At this time, the current is A2, and A2 < A1, and the compressor operates normally. Under this precondition, it is required that the structural part of the compressor still operates at the frequency N1 to complete the research on the high-speed of the structural part. Based on the above assumptions, using the characteristics of gear transmission, such as Figure 1-Figure 6 As shown, the present invention provides an equivalent frequency device, including a driving shaft 1, a first transmission shaft 6, a second transmission shaft 11, a relay 4, a piezoelectric crystal 10, a first transmission component, and a second transmission component; wherein:

[0040] One end of the driving shaft 1 is fixed through a support part 2; one end of the second transmission shaft 11 is fixed through a support part 2; both ends of the second transmission shaft 6 are fixed through the support part 2;

[0041] A relay 4 is arranged between the driving shaft 1 and the second transmission shaft 11; when the relay 4 is coupled, the driving shaft 1 and the second transmission shaft 11 are connected together, and when the relay 4 is disconnected, the driving shaft 1 and the second transmission shaft 11 are disconnected;

[0042] The first transmission shaft 6 is drivingly connected to the driving shaft 1 through a first transmission component that can be closed and disconnected;

[0043] The second transmission shaft 11 and the first transmission shaft 6 are drivingly connected through a second transmission component that can be closed and disconnected;

[0044] The piezoelectric crystal 10 is arranged on the first transmission shaft 6 to control the closing or disconnection of the first transmission component and the second transmission component; the connection and disconnection between the driving shaft 1, the first transmission shaft 6, and the second transmission shaft 11 are realized through the piezoelectric crystal 10;

[0045] The transmission ratio of the first transmission component is 1; that is, when the driving shaft 1 is connected to the first transmission shaft 6, due to the transmission ratio of the first transmission component being 1, the driving shaft 1 and the first transmission shaft 6 operate at the same frequency;

[0046] The transmission ratio of the second transmission component is N2 / N1, that is, when the second transmission shaft 11 is connected to the first transmission shaft 6, when the first transmission shaft 6 operates at the frequency N1, the second transmission shaft 11 operates at the frequency N2 / N1.

[0047] The equivalent frequency device 400 provided by the present invention enables the compressor pump body 300 structure to operate at the target frequency N1 under high-frequency and heavy-load conditions. When the motor 100 in the compressor operates at the frequency N2, the controller displays the motor 100 operating frequency N2, but the actual pump body 300 operates at the target frequency N1 under the action of gear transmission. This ensures that when the compressor has a large current and reduces the frequency due to high-frequency and heavy-load conditions, the structural part can still operate at the target frequency, and the high-frequency reliability and performance of the compressor can be studied, solving the problem of automatic frequency reduction of the compressor due to high-frequency and large current, and the inability to carry out high-frequency reliability tests.

[0048] As an optional embodiment of the present invention, the first transmission assembly includes a first gear 31 and a fourth gear 32; the first gear 31 is fixed on the driving shaft 1, and the fourth gear 32 is fixed on the first transmission shaft 6; the diameter of the fourth gear 32 is equal to the diameter of the first gear 31, thereby achieving a transmission ratio of 1 between the two.

[0049] As an optional embodiment of the present invention, the second transmission assembly includes a second gear 5 and a third gear 9; the second gear 5 is fixed on the second transmission shaft 11, and the third gear 9 is fixed on the first transmission shaft 6; the diameter ratio of the second gear 5 to the third gear 9 is N2 / N1, thereby achieving a transmission ratio of N2 / N1 between the two.

[0050] In order to achieve automatic adjustment, in this embodiment, it also includes a spring 7 mounted on the first transmission shaft 6, one end of the spring 7 is fixedly connected to the first transmission shaft 6, and the other end is in contact with the fourth gear 32; when the first gear 31 and the fourth gear 32 are meshed and connected, the spring 7 is in a compressed state.

[0051] like Figure 4 and Figure 5As shown in the figure, as a further improvement of the present invention, it further includes a lock nut 8 that is movably sleeved on the first transmission shaft 6 and is in contact connection with the third gear 9. A through hole 81 is provided on the lock nut 8; a clamping groove 82 is provided on the side wall of the first transmission shaft 6; the piezoelectric crystal 10 passes through the through hole 81 and is clamped into the clamping groove 82, and when the piezoelectric crystal 10 is clamped in the clamping groove 82, the lock nut 8 abuts against the third gear 9. When the piezoelectric crystal 10 is connected to a normal current, it will not deform, and its end is clamped into the clamping groove 82 of the first transmission shaft 6, thereby realizing the locking of the position of the lock nut 8, and indirectly locking the position of the third gear 9. When the piezoelectric crystal 10 is connected to a large current A1, it will deform, and when deforming, it will disengage from the clamping groove 82 of the first transmission shaft 6, thereby realizing the release of the locked state of the position of the lock nut 8, and indirectly releasing the third gear 9. When the spring 7 is not under pressure, it will recover, thereby pushing the third gear 9 and the fourth gear 32 to move, so that the third gear 9 meshes with the second gear 5, and the fourth gear 32 meshes with the first gear 31, thereby realizing the rotational transmission between each shaft.

[0052] As a further improvement of the present invention, there is an active gap between the inner wall of the lock nut 8 and the first transmission shaft 6.

[0053] Furthermore, there is also an active gap between the through hole 81 and the piezoelectric crystal 10.

[0054] In the initial stage, the transmission ratio of the gear position is 1, the driving shaft 1 and the second transmission shaft 11 operate at the same frequency, and the driving part of the motor 100 and the structural part operate synchronously. When the compressor operates at a high frequency N1, a large current appears. The large current, as an electrical signal, triggers the piezoelectric crystal 10 and the relay 4 at the moment of appearance. The relay 4 switches from the coupled state to the closed state. At the same time, the piezoelectric crystal 10 deforms, and a pair of gears on the transmission shaft are displaced and coupled under the action of the spring 7, and the gear transmission ratio switches from 1 to N2 / N1. The compressor motor 100 part operates at the frequency N2. At this time, the current is A2, and A2 < A1, so that the compressor can operate stably. Due to the characteristics of gear transmission, the structural part realizes operation at the target frequency N1. This actually realizes the equivalent N1 frequency operation of the compressor. The high-frequency and reliability characteristics of the structural part are studied.

[0055] The equivalent frequency device 400 of the present invention separates the structural part of the compressor as the research object from the motor 100 part, creates conditions for separately studying the high-frequency characteristics of the structure, provides a way to timely discover the high-frequency defects of the structural part and make targeted structural optimization adjustments, and speeds up the overall development process of the compressor.

[0056] In the existing compressor structure, when operating at a relatively high frequency under harsh working conditions, due to the limited performance of the motor 100 itself, such a high load often easily causes the compressor to have a large current, triggering the protection value of the controller, and then causing the compressor to automatically reduce its frequency. In this way, the compressor cannot maintain the target frequency operation under such harsh working conditions, and this high-frequency characteristic cannot be studied, delaying the development process of the compressor.

[0057] As Figure 6 shown, a compressor provided by the present invention includes a pump body 300, a motor 100, and an equivalent frequency device 400; the driving shaft 1 in the equivalent frequency device 400 is connected to the motor 100, and the second driving shaft 11 is connected to the crankshaft 200 in the pump body 300.

[0058] During use, when the driving shaft 1 is connected to the second driving shaft 11, that is, when the relay is supplied with normal current, the transmission ratio of the crankshaft 200 to rotate is 1, and the operating frequencies of the motor 100 part and the structural part are the same. At this time, the third gear 9 on the first driving shaft 6 is disengaged from the fourth gears 32 of the driving shaft 1 and the second driving shaft 11 under the action of the lock nut 8 and the piezoelectric crystal 10, as Figure 2 shown. When the compressor operates at a high frequency N1, a large current A1 appears. The large current, as an electrical signal, triggers the piezoelectric crystal 10 and the relay 4 at the moment of appearance. The relay 4 switches from the closed state to the open state, and at the same time, the piezoelectric crystal 10 undergoes a bending deformation and disengages from the first driving shaft 6, as Figure 3 shown. The fourth gear 32 on the first driving shaft 6 is displaced under the action of the spring 7. At this time, the fourth gear 32 meshes with the first gear 31, and the second gear 5 meshes with the third gear 9. The movement is transmitted along the driving shaft 1 to the first driving shaft 6 and then to the second driving shaft 11, and the transmission ratio is switched from 1 to N2 / N1. The motor 100 part of the compressor operates at a frequency N2, and at this time the current is A2, A2 < A1, and the compressor can operate stably. Due to the characteristics of gear transmission, the structural part realizes operation at the target frequency N1, and the high-frequency reliability characteristic can be studied.

[0059] The compressor of the present invention solves the problems of the high-frequency performance and reliability research of the structural part of the compressor. Under the condition that the motor 100 cannot maintain high-frequency operation, without waiting for the development of a new motor 100, relying on the present invention, the high-frequency characteristics of the structural part can be investigated, which provides the possibility for timely discovering the high-frequency defects of the structural part and making targeted structural optimization adjustments, greatly shortening the overall development process of the compressor, and providing a way to promote the transformation of the compressor from research and development to mass production, accelerating productization and marketization, and serving the economic and social development.

[0060] A control method provided by the present invention is used for controlling the equivalent frequency operation of a compressor. The method includes the following steps:

[0061] Step S1, start the compressor, close the relay 4, couple the driving shaft 1 with the second transmission shaft 11, and run at the same frequency;

[0062] Step S2, when the compressor runs to the high frequency N1, the first transmission shaft 6 is controlled to be coupled with the driving shaft 1 and the second transmission shaft 11, and the driving shaft 1 is disconnected from the second transmission shaft 11, so as to perform equivalent same-frequency operation.

[0063] As a further improvement of the present invention, when the compressor runs to the high frequency N1, the first transmission shaft 6 is controlled to couple with the driving shaft 1 and the second transmission shaft 11, and the driving shaft 1 is disconnected from the second transmission shaft 11, so as to perform equivalent same-frequency operation, including:

[0064] Receiving the high current signal, the relay 4 is disconnected, thereby disconnecting the driving shaft 1 from the second transmission shaft 11;

[0065] The piezoelectric crystal 10 is deformed under the action of the large current A1 to disengage from the slot 82 of the first transmission shaft 6;

[0066] The first transmission shaft 6 is displaced under the action of the spring 7, so that the first gear 31 and the fourth gear 32 are meshed, and the second gear 5 and the third gear 9 are meshed respectively, so as to realize the coupling of the first transmission shaft 6 with the driving shaft 1 and the second transmission shaft 11;

[0067] The motor 100 is controlled to run at the frequency N2, and the compressor maintains the high frequency N1 operation under the transmission ratio of the equivalent frequency device 400.

[0068] The control method of the present invention enables the compressor pump body 300 structure to operate at the target frequency N1 under high-frequency and heavy-load conditions. When the motor 100 in the compressor operates at the frequency N2, the controller displays the motor 100 operating frequency N2, but the actual pump body 300 operates at the target frequency N1 under the action of gear transmission. When the compressor is subjected to high-frequency and heavy-load conditions and a large current appears and the frequency is reduced, the structural part can still operate at the target frequency, and the high-frequency reliability and performance of the compressor can be studied. The piezoelectric sensor can be used to convert the electrical signal into a mechanical signal, and the gear transmission principle is combined to achieve the equivalent frequency operation purpose of the present invention.

[0069] First of all, it should be explained here that “inward” refers to the direction toward the center of the accommodating space, and “outward” refers to the direction away from the center of the accommodating space.

[0070] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate directions or positional relationships based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0071] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0072] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0073] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0074] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0075] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An equivalent frequency device, characterized in that: It includes a driving shaft, a first transmission shaft, a second transmission shaft, a relay, a piezoelectric crystal, a first transmission assembly, and a second transmission assembly; wherein: The relay is arranged between the driving shaft and the second transmission shaft; The first transmission shaft is in transmission connection with the driving shaft via the first transmission assembly which can be closed and disconnected; The second transmission shaft and the first transmission shaft are connected in transmission via the second transmission assembly which can be closed and disconnected; The piezoelectric crystal is arranged on the first transmission shaft to control the closing or opening of the first transmission component and the second transmission component; The transmission ratio of the first transmission assembly is 1; The transmission ratio of the second transmission assembly is N2 / N1.

2. The equivalent frequency device according to claim 1, characterized in that: The first transmission assembly includes a first gear and a fourth gear; the first gear is fixed on the driving shaft, and the fourth gear is fixed on the first transmission shaft; the diameter of the fourth gear is equal to the diameter of the first gear.

3. The equivalent frequency device according to claim 1, characterized in that: The second transmission assembly includes a second gear and a third gear; the second gear is fixed on the second transmission shaft, and the third gear is fixed on the first transmission shaft; the diameter ratio of the second gear diameter to the third gear diameter is N2 / N1.

4. The equivalent frequency device according to claim 2, characterized in that: It also includes a spring sleeved on the first transmission shaft, one end of the spring is fixedly connected to the first transmission shaft, and the other end is in contact with the fourth gear; when the first gear and the fourth gear are meshed and connected, the spring is in a compressed state.

5. The equivalent frequency device according to claim 3, characterized in that: It also includes a lock nut movably mounted on the first transmission shaft and contactably connected to the third gear, wherein the lock nut is provided with a through hole; a slot is provided on the side wall of the first transmission shaft; the piezoelectric crystal passes through the through hole and is inserted into the slot, and when the piezoelectric crystal is inserted into the slot, the lock nut abuts against the third gear.

6. The equivalent frequency device according to claim 5, characterized in that: A movable gap is reserved between the inner wall of the lock nut and the first transmission shaft.

7. A compressor, characterized in that: It comprises a pump body, a motor and an equivalent frequency device as described in any one of claims 1 to 6; the driving shaft in the equivalent frequency device is connected to the motor, and the second transmission shaft is connected to the crankshaft in the pump body.

8. A control method, characterized in that: For performing equivalent frequency operation control on the compressor as claimed in claim 7, the method comprises the following steps: Start the compressor, close the relay, and couple the driving shaft with the second transmission shaft to run at the same frequency; When the compressor runs to the high frequency N1, the first transmission shaft is controlled to be coupled with the driving shaft and the second transmission shaft, and the driving shaft is disconnected from the second transmission shaft to perform equivalent same-frequency operation.

9. The method according to claim 8, characterized in that When the compressor runs to the high frequency N1, the first transmission shaft is controlled to couple with the driving shaft and the second transmission shaft, and the driving shaft is disconnected from the second transmission shaft to perform equivalent same-frequency operation, including: Receiving a high current signal, the relay is disconnected, thereby disconnecting the driving shaft from the second transmission shaft; The piezoelectric crystal is deformed under the action of a large current to disengage from the slot position of the first transmission shaft; The first transmission shaft is displaced under the action of the spring, so that the first gear and the fourth gear are meshed, and the second gear and the third gear are meshed respectively, so as to realize the coupling of the first transmission shaft with the driving shaft and the second transmission shaft; The motor is controlled to run at frequency N2, and the compressor maintains high frequency N1 operation under the transmission ratio of the equivalent frequency device.

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