A sliding valve automatic reset device and screw compressor

Abstract

The application provides a sliding valve automatic reset device and a screw compressor, which comprises a rotor and a sliding valve; the rotor and the sliding valve are arranged in a sliding valve cavity, and the sliding valve is movably arranged in the sliding valve cavity; a driving mechanism is arranged at one end of the sliding valve cavity, and the driving mechanism drives the sliding valve to slide in the sliding valve cavity; a reset assembly is arranged at the other end of the sliding valve cavity away from the driving mechanism, and the reset assembly comprises a storage cavity and a first valve; the storage cavity is used for storing fluid injected into the sliding valve cavity, and the first valve is used for opening or closing the storage cavity; a controller is signal-connected with the first valve; when the controller controls the first valve to open the storage cavity, the sliding valve cavity and the storage cavity are communicated, so that the fluid in the storage cavity flows into the sliding valve cavity, thereby pushing the sliding valve to move towards the driving mechanism. The sliding valve automatic reset device and the screw compressor solve the technical problem that the sliding valve is not easy to reset after the screw compressor stops in the related art.

Description

Technical Field

[0001] This invention relates to the field of screw compressor technology, specifically to an automatic slide valve reset device and a screw compressor. Background Technology

[0002] With the continuous advancement of screw compressor technology, it has been widely used in air conditioning, refrigeration, freezing, and chemical industries. The working principle of a screw compressor is that a motor drives a rotor to rotate. The rotation of the rotor, along with the cooperation of a slide valve, compresses the refrigerant, increasing its pressure. The refrigerant is then sent into the condenser through the compressor's discharge port.

[0003] Existing screw compressor loading and unloading controls all use solenoid valves to control the flow of oil in the internal oil circuit of the screw compressor, thereby pushing the slide valve to slide back and forth along the direction of the male and female rotors to regulate the loading and unloading of the compressor. However, the power source for the slide valve to slide is the pressure difference between the compressor's discharge and suction ends. After the compressor stops, the pressure disappears, and the slide valve may fail to reset. When restarting, the compressor is prone to starting under load, resulting in excessive starting current and affecting the stability of the upstream power distribution system.

[0004] Therefore, existing technologies need further development. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned technical deficiencies and provide an automatic reset device for a slide valve and a screw compressor, so as to solve the technical problem that the slide valve is not easy to reset after the screw compressor stops in the related art.

[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution: It provides an automatic reset device for a slide valve and a screw compressor, comprising: a rotor and a slide valve; a slide valve cavity, wherein the rotor and the slide valve are disposed within the slide valve cavity, and the slide valve is movably disposed within the slide valve cavity; a drive mechanism, disposed at one end of the slide valve cavity, which drives the slide valve to slide within the slide valve cavity; a reset assembly, disposed at the end of the slide valve cavity away from the drive mechanism, the reset assembly including a storage cavity and a first valve, the storage cavity being used to store fluid injected into the slide valve cavity, and the first valve being used to open or close the storage cavity; and a controller, which is signal-connected to the first valve. When the controller controls the first valve to open the storage cavity, the slide valve cavity and the storage cavity are connected, allowing fluid in the storage cavity to flow into the slide valve cavity, thereby pushing the slide valve to move towards the drive mechanism.

[0007] Furthermore, the reset assembly also includes: a fluid inlet, which is located on the side of the reset assembly away from the slide valve chamber, through which fluid enters the storage chamber; a second valve, which opens or closes the fluid inlet; and a fluid outlet, which is located opposite to the fluid inlet, whereby when the first valve opens the fluid outlet, fluid flows from the storage chamber to the slide valve chamber, and when the first valve closes the fluid outlet, the fluid is sealed within the storage chamber.

[0008] Furthermore, the controller is connected to the second valve signal, and the controller opens or closes the second valve by transmitting the signal.

[0009] Furthermore, the automatic reset device for the slide valve also includes a connecting conduit, which is connected to the fluid inlet, through which fluid enters the storage chamber from the fluid inlet.

[0010] Furthermore, the reset assembly also includes a first connecting plate, a second connecting plate, and a third connecting plate. The first connecting plate and the second connecting plate are arranged at intervals. One end of the third connecting plate is connected to the first connecting plate, and the other end of the third connecting plate is connected to the second connecting plate. The first connecting plate, the second connecting plate, and the third connecting plate form a storage cavity. The fluid inlet is located on the first connecting plate, and the fluid outlet is located on the second connecting plate. The second connecting plate is connected to the slide valve cavity.

[0011] Furthermore, the first and second connecting plates are circular plates, and the third connecting plate is a cylindrical structure, so that the storage cavity is a cylindrical structure.

[0012] Furthermore, there are multiple fluid outlets, which are spaced apart on the second connecting plate.

[0013] Furthermore, there are multiple fluid inlets, which are spaced apart on the first connecting plate; there are also multiple connecting conduits, which are arranged one-to-one with the multiple fluid inlets.

[0014] Furthermore, the first valve is a vent valve, and the second valve is a check valve.

[0015] A screw compressor includes a compressor body, and the compressor body is further provided with the aforementioned automatic slide valve reset device.

[0016] Beneficial effects:

[0017] 1. With the automatic reset device of the slide valve of the present invention, the slide valve can be automatically reset after the machine stops, avoiding the problem of load during restart.

[0018] 2. The screw compressor of the present invention can automatically reset the slide valve, avoiding excessive starting current of the slide valve under load, thus providing protection for the power distribution system and improving the stability of the compressor and the power distribution system.

[0019] 3. The screw compressor of this invention is equipped with a storage device, and the impact force of the high-pressure refrigerant release pushes the slide valve to reset. The control method is simple and convenient, and the production cost is low. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the automatic reset device for the slide valve used in an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the reset assembly of the automatic reset device for the slide valve used in an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the slide valve in the loading state used in an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the slide valve in the unloading state used in an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the internal structure of a screw compressor provided in an embodiment of the present invention.

[0025] The above figures include the following reference numerals:

[0026] 1. Rotor; 2. Slide valve; 3. Slide valve chamber; 4. Drive mechanism; 5. Reset assembly; 51. Storage chamber; 52. Fluid inlet; 53. Fluid outlet; 54. Connecting conduit; 55. First connecting plate; 56. Second connecting plate; 57. Third connecting plate; 6. Compressor body. Detailed Implementation

[0027] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0028] According to an embodiment of the present invention, an automatic reset device for a slide valve is provided. Please refer to [link / reference]. Figures 1 to 5The system includes: a rotor 1 and a slide valve 2; a slide valve cavity 3, in which the rotor 1 and the slide valve 2 are disposed, and the slide valve 2 is movably disposed within the slide valve cavity 3; a drive mechanism 4, disposed at one end of the slide valve cavity 3, which drives the slide valve 2 to slide within the slide valve cavity 3; a reset assembly 5, disposed at the end of the slide valve cavity 3 away from the drive mechanism 4, which includes a storage chamber 51 and a first valve, wherein the storage chamber 51 is used to store fluid injected into the slide valve cavity 3, and the first valve is used to open or close the storage chamber 51; and a controller, which is signal-connected to the first valve. When the controller controls the first valve to open the storage chamber 51, the slide valve cavity 3 and the storage chamber 51 are connected, so that the fluid in the storage chamber 51 flows into the slide valve cavity 3, thereby pushing the slide valve 2 to move toward the drive mechanism 4.

[0029] In the automatic reset device of the slide valve in this embodiment, the rotor 1 and the slide valve 2 compress the gaseous refrigerant in the compressor cavity. The cavity matching the slide valve 2 is the slide valve cavity 3. The slide valve 2 moves back and forth in the slide valve cavity 3 driven by the drive mechanism 4, and compresses the refrigerant in the cavity together with the rotation of the rotor 1, forming a high-temperature and high-pressure gaseous refrigerant that flows to the condenser. A reset assembly 5 is set at the end of the slide valve cavity 3 away from the drive mechanism 4. The reset assembly 5 has a storage cavity 51, which is used to store high-pressure refrigerant. The storage cavity 51 is opened or closed by the first valve. After the first valve opens the storage cavity 51, the storage cavity 51 is connected to the slide valve cavity 3. After the equipment stops, the controller controls the first valve to open the storage cavity 51. The high-pressure refrigerant inside the storage cavity 51 rushes out and enters the slide valve cavity 3. The pressure in the slide valve cavity 3 increases instantly, directly pushing the slide valve 2 to the drive mechanism end, which is the lowest load point, thus completing the reset action and preventing the equipment from starting under load. The automatic reset device for the slide valve in this embodiment solves the technical problem in the related art that the slide valve is not easy to reset after the screw compressor stops.

[0030] Specifically, rotor 1 is a male and female rotor, and slide valve 2 is set on one side of the two rotors 1. The slide valve 2 and the two rotors 1 are in the compressor cavity. The low-pressure refrigerant at the compressor suction end is transformed into high-pressure refrigerant through the rotation of the male and female rotors and the back and forth movement of slide valve 2, and finally discharged from the exhaust end.

[0031] See Figure 2In the automatic reset device of the slide valve in this embodiment, the reset component 5 further includes: a fluid inlet 52, which is located on the side of the reset component 5 away from the slide valve cavity 3, through which fluid enters the storage cavity 51; a second valve, which opens or closes the fluid inlet 52; and a fluid outlet 53, which is disposed opposite to the fluid inlet 52. When the first valve opens the fluid outlet 53, fluid flows from the storage cavity 51 to the slide valve cavity 3. When the first valve closes the fluid outlet 53, the fluid is sealed in the storage cavity 51. Refrigerant enters the storage cavity 51 through the fluid inlet 52. The fluid outlet 53 is disposed opposite to the fluid inlet 52 and communicates with the slide valve cavity 3. When it is necessary to store high-pressure refrigerant, the first valve closes the fluid outlet 53 and the second valve opens the fluid inlet 52. When the slide valve needs to be reset, the second valve closes the fluid inlet 52 and the first valve opens the fluid outlet 53, allowing high-pressure refrigerant to enter the slide valve cavity 3.

[0032] In the automatic reset device of the slide valve in this embodiment, the controller is signal-connected to the second valve, and the controller opens or closes the second valve through the transmitted signal. The controller controls the first valve and the second valve. When the equipment is stopped, the controller controls the first valve to open the fluid outlet 53; when the equipment is started, the fluid outlet 53 is in the closed state to ensure that the refrigerant in the storage chamber 51 does not flow out when the equipment is started. Conversely, when the equipment is started, the controller controls the second valve to open the fluid inlet 52 to allow high-pressure refrigerant to enter the storage chamber 51; when the equipment is stopped, the second valve closes the fluid inlet 52 so that all the high-pressure refrigerant in the storage chamber 51 enters the slide valve chamber 3, providing a sufficient pressure difference to cause the slide valve to reset.

[0033] See Figure 1 and Figure 2 In the automatic reset device of the slide valve in this embodiment, the automatic reset device of the slide valve also includes a connecting conduit 54, which is connected to the fluid inlet 52. The fluid enters the storage chamber 51 from the fluid inlet 52 through the connecting conduit 54. The connecting conduit 54 is provided at the fluid inlet 52. The connecting conduit 54 can be inside or outside the machine body and is connected to the exhaust end of the compressor. The exhaust end of the compressor is high-pressure refrigerant. This configuration allows a portion of the compressed refrigerant to be directly introduced into the connecting conduit 54 and stored in the storage chamber 51. After the machine stops, it is sprayed into the slide valve chamber 3.

[0034] See Figure 2In the automatic reset device of the slide valve in this embodiment, the reset assembly 5 further includes a first connecting plate 55, a second connecting plate 56, and a third connecting plate 57. The first connecting plate 55 and the second connecting plate 56 are arranged at intervals. One end of the third connecting plate 57 is connected to the first connecting plate 55, and the other end of the third connecting plate 57 is connected to the second connecting plate 56. The first connecting plate 55, the second connecting plate 56, and the third connecting plate 57 form a storage cavity 51. A fluid inlet 52 is provided on the first connecting plate 55, and a fluid outlet 53 is provided on the second connecting plate 56. The second connecting plate 56 is connected to the slide valve cavity 3. The first connecting plate 55 and the second connecting plate 56 are arranged at intervals and parallel to each other. The third connecting plate 57 is provided in the middle between them. One end of the third connecting plate 57 is connected to the first connecting plate 55, and the other end of the third connecting plate 57 is connected to the second connecting plate 56. The first connecting plate 55, the second connecting plate 56, and the third connecting plate 57 form a storage cavity 51 for storing high-pressure refrigerant. The connection between the second connecting plate 56 and the slide valve chamber 3 opens the fluid inlet 52 to connect the storage chamber 51 and the slide valve chamber 3, thereby allowing the high-pressure refrigerant to enter the slide valve chamber 3 from the storage chamber 51.

[0035] See Figures 1 to 5 In the automatic reset device of the slide valve in this embodiment, the first connecting plate 55 and the second connecting plate 56 are circular plates, and the third connecting plate 57 is a cylindrical structure, so that the storage cavity 51 is a cylindrical structure. The storage cavity 51 is a cylindrical structure, and the slide valve cavity 3 where the slide valve 2 is located is approximately cylindrical. The two have the same shape to facilitate the processing and production of the equipment.

[0036] In the automatic reset device of the slide valve in this embodiment, there are multiple fluid outlets 53, which are spaced apart on the second connecting plate 56. In order to make the slide valve 2 more evenly subjected to force, multiple fluid outlets 53 are provided on the second connecting plate 56, which are spaced apart. When the high-pressure refrigerant rushes into the slide valve cavity 3, the impact force from the multiple fluid outlets 53 increases the contact surface with the slide valve 2, thereby increasing the thrust on the slide valve 2, ensuring that the slide valve 2 can achieve the reset action, and ensuring the stability of the equipment.

[0037] In the automatic reset device of the slide valve in this embodiment, there are multiple fluid inlets 52, which are spaced apart on the first connecting plate 55; there are also multiple connecting conduits 54, which are arranged one-to-one with the multiple fluid inlets 52. The multiple fluid inlets 52 shorten the time required to fill the storage chamber 51 with high-pressure refrigerant, and the one-to-one arrangement of the connecting conduits 54 with the fluid inlets 52 ensures that, during short-term operation, the high-pressure refrigerant required to reset the slide valve 2 can fill the storage chamber 51 in a shorter time.

[0038] In the automatic reset device of the slide valve in this embodiment, the first valve is a vent valve and the second valve is a check valve. The second valve of the reset assembly 5 is a check valve, and the first valve is a vent valve. The check valve ensures that the refrigerant can smoothly enter the storage chamber 51, but cannot flow out in reverse. The vent valve only opens when the equipment is stopped, ensuring that the high-pressure refrigerant in the storage chamber 51 will not flow out when the compressor is started.

[0039] See Figure 5 In this embodiment of the screw compressor, the screw compressor includes a compressor body 6, and the compressor body 6 is also provided with the slide valve automatic reset device as described above.

[0040] See Figure 5 In this embodiment of the screw compressor, the slide valve mechanism is formed by the slide valve 2 and the slide valve chamber 3. The slide valve 2 slides inside the slide valve chamber 3 to realize the functions of loading, unloading, and resetting the compressor. When the screw compressor is operating, the slide valve 2 moves back and forth in the middle of the rotor 1, cooperating with the rotor 1 to compress the gaseous refrigerant. The low-pressure refrigerant at the suction end is compressed into high-pressure refrigerant through the slide valve 2 and the rotor 1 and discharged from the compressor. Figure 3 As shown, slide valve 2 moves towards the discharge end, and the compressor is in a loaded state. At this time, the high-temperature and high-pressure refrigerant formed by compression is at its maximum volume; when the compressor stops, as... Figure 4 As shown, slide valve 2 moves towards the suction end, and the compressor is in an unloaded state. When slide valve 2 reaches the minimum load point, it means that slide valve 2 has reached the reset point.

[0041] One end of the compressor check valve is connected to the compressor discharge end, and the other end is connected to the storage chamber 51. Gaseous refrigerant can flow in a single phase from the compressor discharge end to the storage chamber 51.

[0042] When the compressor starts up, the refrigerant is compressed towards the compressor's discharge end. The high-pressure refrigerant at the compressor's discharge end creates a pressure difference with the inside of the storage chamber 51. The refrigerant then enters the storage chamber 51 through a one-way valve, eventually bringing the pressure inside the storage chamber 51 to match that of the high-pressure refrigerant at the compressor's discharge end. Simultaneously, the controller closes the fluid outlet 53 with the first valve, ensuring that the high-pressure refrigerant stored in the storage chamber 51 does not leak out. After the compressor stops, the controller closes the fluid inlet 52 with the second valve and opens the fluid outlet 53 with the first valve. The high-pressure refrigerant in the storage chamber 51 instantly rushes out into the slide valve chamber 3. The pressure in the slide valve chamber 3 instantly increases, directly pushing the slide valve 2 to the minimum load point, thus completing the reset action. High-pressure refrigerant also enters the compressor body through the gap between the compression section slide valve chamber 3 and the rotor 1. Therefore, when the compressor restarts, the slide valve 2 is in the reset state, avoiding starting under load.

[0043] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0044] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments, and will not be repeated here.

[0045] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0046] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0047] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. An automatic reset device for a slide valve, characterized in that, include: Rotor (1) and slide valve (2); The slide valve cavity (3) is provided with the rotor (1) and the slide valve (2) disposed in the slide valve cavity (3), and the slide valve (2) is movably disposed in the slide valve cavity (3); A drive mechanism (4) is provided at one end of the slide valve cavity (3), and the drive mechanism (4) drives the slide valve (2) to slide within the slide valve cavity (3); A reset assembly (5) is disposed at one end of the slide valve chamber (3) away from the drive mechanism (4). The reset assembly (5) includes a storage chamber (51) and a first valve. The storage chamber (51) is used to store fluid injected into the slide valve chamber (3), and the first valve is used to open or close the storage chamber (51). The controller is connected to the first valve signal. When the controller controls the first valve to open the storage chamber (51), the slide valve chamber (3) and the storage chamber (51) are connected, so that the fluid in the storage chamber (51) flows into the slide valve chamber (3), thereby pushing the slide valve (2) to move in the direction of the drive mechanism (4); The reset component (5) further includes: A fluid inlet (52) is provided on the side of the reset assembly (5) away from the slide valve chamber (3), through which fluid enters the storage chamber (51); The second valve opens or closes the fluid inlet (52). A fluid outlet (53) is provided opposite to the fluid inlet (52). When the first valve opens the fluid outlet (53), the fluid flows from the storage chamber (51) to the slide valve chamber (3). When the first valve closes the fluid outlet (53), the fluid is sealed in the storage chamber (51). When the compressor is started, the refrigerant is compressed towards the compressor exhaust end. The high-pressure refrigerant at the compressor exhaust end will form a pressure difference with the inside of the storage chamber (51). The refrigerant will enter the storage chamber (51) through the one-way valve. Finally, the pressure in the storage chamber (51) and the high-pressure refrigerant at the compressor exhaust end will reach the same pressure. At the same time, the controller controls the first valve to close the fluid outlet (53) to ensure that the high-pressure refrigerant stored in the storage chamber (51) will not flow out. After the compressor stops, the controller controls the second valve to close the fluid inlet (52) and the first valve to open the fluid outlet (53). The high-pressure refrigerant inside the storage chamber (51) rushes out and enters the slide valve chamber (3). The pressure in the slide valve chamber (3) increases instantly and pushes the slide valve (2) to the minimum load point, thus completing the reset action.

2. The automatic reset device for the slide valve according to claim 1, characterized in that, The controller is signal-connected to the second valve, and the controller opens or closes the second valve by transmitting the signal.

3. The automatic reset device for the slide valve according to claim 2, characterized in that, The automatic reset device for the slide valve also includes a connecting conduit (54), which is connected to the fluid inlet (52), and the fluid enters the storage chamber (51) from the fluid inlet (52) through the connecting conduit (54).

4. The automatic reset device for the slide valve according to claim 3, characterized in that, The reset assembly (5) further includes a first connecting plate (55), a second connecting plate (56), and a third connecting plate (57). The first connecting plate (55) and the second connecting plate (56) are arranged at intervals. One end of the third connecting plate (57) is connected to the first connecting plate (55), and the other end of the third connecting plate (57) is connected to the second connecting plate (56). The first connecting plate (55), the second connecting plate (56), and the third connecting plate (57) form the storage cavity (51). The fluid inlet (52) is located on the first connecting plate (55), and the fluid outlet (53) is located on the second connecting plate (56). The second connecting plate (56) is connected to the slide valve chamber (3).

5. The automatic reset device for the slide valve according to claim 4, characterized in that, The first connecting plate (55) and the second connecting plate (56) are circular plates, and the third connecting plate (57) is a cylindrical structure, so that the storage cavity (51) is a cylindrical structure.

6. The automatic reset device for the slide valve according to claim 5, characterized in that, There are multiple fluid outlets (53), and each fluid outlet (53) is arranged at intervals on the second connecting plate (56).

7. The automatic reset device for the slide valve according to claim 6, characterized in that, There are multiple fluid inlets (52), and each fluid inlet (52) is arranged at intervals on the first connecting plate (55); there are multiple connecting conduits (54), and each of the multiple connecting conduits (54) is arranged in a one-to-one correspondence with the multiple fluid inlets (52).

8. The automatic reset device for the slide valve according to claim 2, characterized in that, The first valve is a vent valve, and the second valve is a check valve.

9. A screw compressor, comprising a compressor body (6), characterized in that, The compressor body (6) is further provided with an automatic slide valve reset device as described in any one of claims 1-8.

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