Screw compressor and refrigeration circuit

Abstract

The application provides a screw compressor and a refrigeration circuit. The screw compressor comprises a shell, a slide valve cavity, a slide valve, a slide valve supporting part and a guide mounting part. The slide valve comprises a main valve section slidably arranged in the slide valve cavity along an axial direction of the screw compressor. The slide valve supporting part is fixedly connected to one end of the slide valve along the axial direction. The slide valve supporting part is movably mounted on the shell through the guide mounting part. The refrigeration circuit comprises the screw compressor. The screw compressor can meet the requirements of long-stroke slide valve support and high-precision assembly, the difficulty of machining and assembly is reduced, and the smoothness and reliability of the slide valve operation are improved.

Description

Technical Field

[0001] This application relates to the field of air conditioning equipment technology, and in particular to a screw compressor and a refrigeration circuit. Background Technology

[0002] Screw compressors are commonly used compressors in refrigeration circuits, especially in medium and large-scale refrigeration systems. Due to their energy efficiency, high reliability, and long lifespan in large-scale applications, screw compressors have become a mainstay in industrial and commercial refrigeration, used in energy-efficient large-scale air conditioning chillers, cold storage facilities, and refrigeration equipment. Screw compressors typically use axial movement of a slide valve to achieve load or pressure ratio regulation. For example... Figure 1 and Figure 2 As shown, for screw compressors with a large length-to-diameter ratio, in order to meet the wide range of adjustment requirements, the length and operating stroke of the slide valve 2 are relatively large. After the slide valve 2 moves out of the slide valve cavity 11, it is in a cantilever state. Affected by its own center of gravity, the internal pressure of the compressor and the axial thrust, it is prone to radial swaying, tilting and offset, which causes the slide valve to scrape, collide or even jam with the housing 1 and the slide valve cavity 11, seriously affecting the operating stability and service life of the compressor.

[0003] In related technologies, such as Figure 2 As shown, a valve support 3, concentric with the valve cavity 11, is typically provided on the housing 1 where the valve cavity 11 is located. The valve support 3 is fixed relative to the valve cavity 11, providing local support for the portion of the valve 2 extending out of the valve cavity 11. To ensure the concentricity of the valve cavity 11 and the valve support 3, they must be machined as a single unit. However, the longer the valve support 3, the longer the cantilever of the machining tool, which easily causes vibration during machining, resulting in the inability to guarantee concentricity and straightness, and making it difficult to meet the machining accuracy requirements. Therefore, the valve support 3 in related technologies has an inherent contradiction between support length and machining accuracy, making it difficult to simultaneously meet the requirements of long-stroke support and high-precision assembly.

[0004] The above statements are for the purpose of providing background information in relation to this application only, and do not necessarily constitute related technology. Summary of the Invention

[0005] The purpose of this application is to provide a screw compressor and a refrigeration circuit, which aims to solve the problem that the slide valve support part in the screw compressor of the related technology is difficult to simultaneously meet the requirements of long stroke support and high precision assembly.

[0006] A first aspect of this application provides a screw compressor, comprising: a housing having a slide valve chamber; a slide valve including a main valve section slidably disposed within the slide valve chamber along the axial direction of the screw compressor; a slide valve support portion fixedly connected to one end of the slide valve along the axial direction; and a guide mounting portion, wherein the slide valve support portion is movably mounted on the housing along the axial direction via the guide mounting portion.

[0007] In some embodiments of the screw compressor, the guide mounting portion includes: a first guide structure mounted on one of the housing and the slide valve support portion; and a second guide structure mounted on the other of the housing and the slide valve support portion, which is movably fitted with the first guide structure along the axial direction.

[0008] In some embodiments of the screw compressor, one of the first guide structure and the second guide structure includes a positioning guide rod extending along the axial direction; the other of the first guide structure and the second guide structure includes a guide hole extending along the axial direction, with the positioning guide rod passing through the guide hole and slidably engaging with it; or one of the first guide structure and the second guide structure includes a guide rail extending along the axial direction; the other of the first guide structure and the second guide structure includes a guide block slidably engaging with the guide rail; or one of the first guide structure and the second guide structure includes a guide rail extending along the axial direction; the other of the first guide structure and the second guide structure includes a roller rollingly engaging with the guide rail.

[0009] In some embodiments of the screw compressor, the screw compressor further includes a follow-up control device configured to control the slide valve support to move in the direction of movement of the slide valve.

[0010] In some embodiments of the screw compressor, the follow-up control device includes: an elastic element configured to apply a force along the axial direction tending away from the valve cavity to the valve support; and an electromagnetic device configured to apply a force along the axial direction toward the valve cavity to the valve support, the electromagnetic device being energized or de-energized according to a movement command controlling the movement of the valve.

[0011] In some embodiments of the screw compressor, the slide valve support is snap-fitted to the slide valve.

[0012] In some embodiments of the screw compressor, the slide valve includes a mounting section located at one end of the main valve section along the axial direction near the slide valve support, the slide valve support being mounted on the mounting section.

[0013] In some embodiments of the screw compressor, the slide valve support includes a support plate disposed on the outer periphery of the mounting section, including a support surface that matches the shape of the outer peripheral surface of the mounting section.

[0014] In some embodiments of the screw compressor, the support plate includes a flange disposed radially inside the support surface along the radial direction of the screw compressor, located at the axially outer end of the mounting section away from the main valve section and abutting against the corresponding end face of the mounting section; the mounting section includes a snap fastener having a snap-fit ​​state and including a latch, wherein in the snap-fit ​​state, the latch is disposed at the axially outer end of the flange and abuts against the flange.

[0015] A second aspect of this application provides a refrigeration circuit, including the screw compressor described in the first aspect of this application.

[0016] Based on the screw compressor provided in this application, due to the provision of a slide valve support and a guide mounting part, the slide valve support is fixedly connected to one end of the slide valve along the axial direction, and is movably mounted on the housing along the axial direction via the guide mounting part. The slide valve is supported throughout its movement by the slide valve support, which is movably supported on the housing by the guide mounting part. The slide valve support and the slide valve cavity are physically separated and can be processed separately. The length of the slide valve support does not need to be excessive while meeting the support requirements of the slide valve. Correspondingly, the cantilever of the tool used to process the slide valve support and the slide valve cavity can be shortened accordingly, which helps to avoid tool vibration during processing and thus improves the processing accuracy of the slide valve support and the slide valve cavity. The concentricity and straightness of the slide valve support and the slide valve cavity can be guaranteed by the guiding accuracy of the guide mounting part. The guiding accuracy of the guide mounting part meets the requirements for long-stroke slide valve support and high-precision assembly, reducing the difficulty of processing and assembly, and improving the smoothness and reliability of the slide valve operation. This application is particularly suitable for long-stroke screw compressors with wide load and wide pressure ratio adjustment.

[0017] The refrigeration circuit of this application embodiment has the same effects as the screw compressor of this application embodiment.

[0018] Other features and advantages of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0020] Figure 1 This is a schematic diagram of the structure of a screw compressor in the relevant technology.

[0021] Figure 2 This is a schematic diagram of a screw compressor with a slide valve support, which is related to the technology.

[0022] Figure 3 This is a schematic diagram of the structure of a screw compressor according to some embodiments of this application.

[0023] Figure 4 This is a schematic diagram of the structure of a screw compressor according to other embodiments of this application.

[0024] Figures 1 to 4 In the figures, the labels represent:

[0025] 1. Housing; 11. Spool valve chamber;

[0026] 2. Spool valve; 21. Main valve section; 22. Mounting section; 221. Snap fastener; 2211. Tongue;

[0027] 3. Spool valve support; 31. Support plate; 311. Support surface; 32. Lug; 33. Flange;

[0028] 4. Guide mounting part; 41. Positioning guide rod; 42. Guide hole;

[0029] 5. Follow-up control device; 51. Elastic element; 52. Electromagnetic device. Detailed Implementation

[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0031] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0032] In the description of this application, it should be understood that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application.

[0033] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0034] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0035] like Figure 3 and Figure 4 As shown, this application provides a screw compressor, including a housing 1, a slide valve 2, a slide valve support 3, and a guide mounting portion 4. The housing 1 has a slide valve cavity 11. The slide valve 2 includes a main valve section 21 slidably disposed within the slide valve cavity 11 along the axial direction. The slide valve support 3 is fixedly connected to one axial end of the slide valve 2 relative to it. The slide valve support 3 is axially movably mounted on the housing 1 via the guide mounting portion 4.

[0036] In the screw compressor of this embodiment, a valve support 3 and a guide mounting part 4 are provided. The valve support 3 is fixedly connected to one axial end of the valve 2 and is movably mounted on the housing 1 along the axial direction via the guide mounting part 4. The entire movement of the valve 2 is supported by the valve support 3, while the valve support 3 is movably supported on the housing 1 by the guide mounting part 4. The valve support 3 and the valve cavity 11 are physically separated and can be processed separately. The length of the valve support 3 is sufficient to support the valve 2. When required, the length does not need to be excessive. Correspondingly, the cantilever of the tool used to machine the valve support 3 and the valve cavity can be shortened accordingly, which helps to avoid tool vibration during machining, thereby improving the machining accuracy of the valve support 3 and the valve cavity 11. The concentricity and straightness of the valve support 3 and the valve cavity 11 can be guaranteed by the guiding accuracy of the guide mounting part 4. The guiding accuracy of the guide mounting part 4 meets the requirements of long-stroke valve support and high-precision assembly, reducing the difficulty of machining and assembly, and improving the smoothness and reliability of the valve 2 operation. The embodiments of this application are particularly suitable for long-stroke screw compressors with wide load and wide pressure ratio adjustment.

[0037] like Figure 3 and Figure 4 As shown, in some embodiments of the screw compressor, the guide mounting portion 4 includes a first guide structure and a second guide structure. The first guide structure is mounted on one of the housing 1 and the slide valve support portion 3. The second guide structure is mounted on the other of the housing 1 and the slide valve support portion 3, and is axially movable in conjunction with the first guide structure.

[0038] The guide mounting part 4, by providing a first guide structure and a second guide structure on the housing 1 and the slide valve support part 3 respectively, can movably mount the slide valve support part 3 on the housing 1 through the axially movable cooperation between the first guide structure and the second guide structure. Thus, under the guiding support of the first guide structure on the second guide structure, the guide mounting part 4 provides guiding support for the slide valve support part 3, thereby achieving the supporting function of the slide valve support part 3 during the movement of the slide valve 2.

[0039] In some embodiments of the screw compressor, such as Figure 3 and Figure 4As shown, one of the first and second guide structures includes a positioning guide rod 41 extending axially; the other of the first and second guide structures includes a guide hole 42 extending axially, with the positioning guide rod 41 passing through the guide hole 42 and slidably engaging with it. Alternatively, in some embodiments not shown, one of the first and second guide structures includes a guide rail extending axially; the other of the first and second guide structures includes a guide block slidably engaging with the guide rail. Alternatively, in some embodiments not shown, one of the first and second guide structures includes a guide rail extending axially; the other of the first and second guide structures includes a roller slidably engaging with the guide rail.

[0040] One of the first and second guide structures includes a positioning guide rod 41, and the other of the first and second guide structures includes a guide hole 42. It has high guiding accuracy. As long as the fitting clearance is properly controlled, it can achieve precise linear motion, which helps to ensure the coaxiality and straightness of the slide valve support 3 and the slide valve cavity 11. In addition, the structure is simple and compact, and it is very convenient to process and install. It has low cost and is suitable for space-constrained applications such as screw compressors.

[0041] One of the first and second guide structures includes a guide rail, and the other includes a guide block. Both are relatively easy to manufacture and assemble. The guide rail and guide block can be machined into square, V-shaped, or dovetail shapes, etc. Precise linear motion is achieved through fitting precision. The sliding fit is a surface contact, with high contact stiffness, strong load-bearing capacity, high reliability, smooth movement, and simple structure with low cost.

[0042] One of the first guide structure and the second guide structure includes a guide rail, and the other of the first guide structure and the second guide structure includes a roller. The rolling friction is small, the relative movement between them is smooth, the movement sensitivity is higher, and the impact on the movement of the slide valve 2 itself is smaller.

[0043] like Figure 4 As shown, in some embodiments of the screw compressor, the screw compressor also includes a follow-up control device 5, which is configured to control the slide valve support 3 to move in the direction of movement of the slide valve 2.

[0044] Without the follow-up control device 5, the movement of the valve support 3 and the valve 2 is mainly driven by the valve 2. The resistance generated by the valve support 3 will affect the movement of the valve 2 in the opposite direction. The movement of the valve 2 mainly comes from the operating pressure difference of the screw compressor. If the allowable operating pressure difference is small, the valve 2 and the valve support 3 may move slowly or not at all. By setting the follow-up control device 5 to control the valve support 3 to follow the movement direction of the valve 2, this adverse effect of the movement resistance generated by the valve support 3 and the corresponding guide mounting part 4 on the movement control of the valve 2 can be avoided.

[0045] like Figure 4 As shown, in some embodiments of the screw compressor, the follow-up control device 5 includes an elastic element 51 and an electromagnetic device 52. The elastic element 51 is configured to apply an axial force to the slide valve support 3, tending to move away from the slide valve cavity 11. The electromagnetic device 52 is configured to apply an axial force to the slide valve support 3, approaching the slide valve cavity 11, and is energized or de-energized according to a movement command controlling the movement of the slide valve 2.

[0046] The follow-up control device 5 includes an elastic element 51 and an electromagnetic device 52. The electromagnetic device 52 is powered by an external control circuit and is energized or de-energized by the control device according to the movement command that controls the movement of the slide valve 2. When the slide valve 2 moves to the outside of the slide valve cavity 11 ( Figure 4 When the slide valve 2 moves to the left side of the slide valve cavity 11, the control device de-energizes the electromagnetic device 52, the magnetic force disappears, and the slide valve support 3 moves axially outward along with the slide valve 2 under the force of the elastic element 51. Figure 4 When the valve moves (to the right of the valve), the control device energizes the electromagnetic device 52, generating an attraction force. The magnetic force overcomes the force of the elastic element 51, causing the valve support 3 and the valve 2 to move axially inward. Because the valve support 3 is guided with high precision by the guide mounting part 4, it can remain concentric with the valve cavity 11 whether it is energized to engage or de-energized to release, providing stable and reliable support.

[0047] like Figure 3 and Figure 4 As shown, in some embodiments of the screw compressor, the slide valve support 3 is snap-fitted to the slide valve 2.

[0048] The valve support 3 and the valve 2 are snapped together, which facilitates the quick assembly and disassembly of the valve support 3 and the valve 2, and is beneficial for the maintenance and debugging of the screw compressor, ensuring that the valve support 3 and the valve cavity 11 achieve the required coaxiality and straightness.

[0049] like Figure 3 and Figure 4As shown, in some embodiments of the screw compressor, the slide valve 2 includes a mounting section 22, which is located at one end of the main valve section 21 along the axial direction near the slide valve support 3, and the slide valve support 3 is mounted on the mounting section 22.

[0050] By setting the installation section 22, it is beneficial for the slide valve support part 3 and the slide valve 2 to be positioned and assembled, thereby enabling the slide valve support part 3 and the slide valve cavity 11 to achieve the required coaxiality and straightness.

[0051] like Figure 3 and Figure 4 As shown, in some embodiments of the screw compressor, the slide valve support 3 includes a support plate 31, which is disposed on the outer periphery of the mounting section 22 and includes a support surface 311 that matches the shape of the outer periphery of the mounting section 22.

[0052] The support plate 31 is set on the outer periphery of the mounting section 22, including the support surface 311 that matches the shape of the outer periphery of the mounting section 22. The slide valve support part 3 is in contact with the slide valve 2, which improves the positioning and support effect. It is beneficial for the slide valve support part 3 and the slide valve cavity 11 to achieve the required coaxiality and straightness, thereby making it more convenient for the slide valve support part 3 and the slide valve 2 to be positioned, assembled and stably supported.

[0053] like Figure 3 and Figure 4 As shown, in some embodiments of the screw compressor, the support plate 31 includes a flange 33, which is radially disposed on the inner side of the support surface 311 along the radial direction of the screw compressor, located at the axial outer end of the mounting section 22 away from the main valve section 21 and abutting against the corresponding end face of the mounting section 22; the mounting section 22 includes a latch 221, which has a snap-fit ​​state and includes a latch tongue 2211. In the snap-fit ​​state, the latch tongue 2211 is disposed at the axial outer end of the flange 33 and abuts against the flange 33.

[0054] By setting the flange 33 and the snap-fit ​​221, the slide valve support 3 and the slide valve 2 can be snapped together, which facilitates the quick assembly and disassembly of the slide valve support 3 and the slide valve 2, and is beneficial for the maintenance and debugging of the screw compressor. It ensures that the slide valve support 3 and the slide valve cavity 11 achieve the required coaxiality and straightness, and realizes the stable synchronous movement of the slide valve support 3 and the slide valve 2 along the axial direction, so that the slide valve support 3 stably supports the slide valve 2 during the movement of the slide valve 2.

[0055] A second aspect of this application provides a refrigeration circuit, including the screw compressor of the first aspect of this application.

[0056] The refrigeration circuit of this application embodiment has the same advantages as the screw compressor of this application embodiment. This refrigeration circuit can be used, for example, in the refrigeration circuit of medium and large-scale refrigeration systems, such as in energy-efficient, high-reliability air conditioning chillers, cold storage, and refrigeration equipment.

[0057] The following combination Figure 3 and Figure 4 The screw compressor of the present application embodiment will be described in detail.

[0058] like Figure 3 As shown, the screw compressor includes a housing 1, a slide valve 2, a slide valve support 3, and a guide mounting part 4.

[0059] The housing 1 has a rotor cavity and a slide valve cavity 11 located below the rotor cavity. The rotor cavity is used to accommodate the male screw and female screw of the screw compressor.

[0060] The slide valve 2 includes a main valve section 21 and a mounting section 22. The main valve section 21 is axially slidably disposed within the slide valve cavity 11 and is used to adjust the internal volume ratio and pressure ratio of the screw compressor. The mounting section 22 is located at one end of the main valve section 21 axially near the slide valve support 3. Figure 3 The valve support 3 (located at the left end) is mounted on the mounting section 22. The mounting section 22 includes a latch 221. The latch 221 includes a latch tongue 2211 and a pivot for rotatably mounting the latch tongue 2211 to the end face of the mounting section 22. In this embodiment, there are two latches 221.

[0061] The valve support 3 is fixedly connected to one axial end of the valve 2 relative to the valve 2. The valve support 3 is axially movable on the housing 1 via the guide mounting part 4.

[0062] The slide valve support 3 includes a support plate 31, a lug 32, and a flange 33.

[0063] The support plate 31 is disposed on the outer periphery of the mounting section 22, including a support surface 311 that matches the shape of the outer periphery of the mounting section 22. In this embodiment, the lower surface of the mounting section 22 is an arc-shaped cylindrical surface, and the support plate 31 is located below the mounting section 22, with its support surface 311 being an arc-shaped cylindrical surface that matches the shape of the lower surface of the mounting section 22. Two lugs 32 are respectively located on both sides of the support plate 31. In this embodiment, a connecting flange is also provided between the two lugs 32 below the support plate 31, which can increase the overall strength of the slide valve support part 3.

[0064] The valve support 3 and the valve 2 are connected by a snap-fit ​​connection between a latch 221 and a flange 33. The flange 33 is located radially inside the support surface 311 along the radial direction of the screw compressor, at the axial outer end of the mounting section 22 furthest from the main valve section 21, and abuts against the corresponding end face of the mounting section 22. The latch 221 has a snap-fit ​​state. In the snap-fit ​​state, the latch 2211 is located at the axial outer end of the flange 33 and abuts against the flange 33. To disassemble the valve support 3 and the valve 2, rotate the pivot of the latch 221 to disengage the latch 2211 from the flange 33. Therefore, the snap-fit ​​connection between the valve support 3 and the valve 2 in this embodiment is convenient and quick to install and remove.

[0065] The guide mounting part 4 includes a first guide structure and a second guide structure. The first guide structure includes a positioning guide rod 41, which extends axially, and one axial end of the positioning guide rod 41 ( Figure 3 The right end of the valve is fixedly installed on the housing 1. The second guide structure includes a guide hole 42, which extends axially and is disposed on the lug 32 of the slide valve support 3. The positioning guide rod 41 passes through the guide hole 42 and is slidably engaged with the guide hole 42.

[0066] In this embodiment, to ensure the stable movement and support of the slide valve support 3 on the housing 1, the guide mounting part 4 includes two first guide structures and a matching second guide structure spaced apart circumferentially. In embodiments not shown, the guide mounting part 4 includes one first guide structure and a corresponding second guide structure, or three or more first guide structures and matching second guide structures spaced apart circumferentially.

[0067] This embodiment of the screw compressor relates to a slide valve support structure for supporting long-stroke slide valves and improving the smoothness and reliability of slide valve operation. The slide valve support structure includes a slide valve support part 3 and a guide mounting part 4. This slide valve support structure is stable, and by controlling the guiding accuracy of the guide mounting part 4, the guiding accuracy can reach the micron level. It is reliable in operation, has low processing and assembly difficulty, and is suitable for screw compressors with long-stroke slide valves that have wide load and wide pressure ratio adjustment.

[0068] In this embodiment, the slide valve cavity 11 is disposed on the housing 1, providing inner end support and guidance for the slide valve 2; at least two positioning guide rods 41 are arranged in parallel and spaced apart, and fixedly installed on the housing 1. The axis of the positioning guide rods 41 is consistent with the moving direction of the slide valve 2, both being the axial direction of the slide valve 2; the guide hole 42 on the slide valve support 3 is slidably connected to the positioning guide rod 41 installed on the housing 1, so that the slide valve support 3 is slidably sleeved on the positioning guide rod 41, and the slide valve support 3 can make high-precision linear movement along the positioning guide rod 41, with high movement accuracy and stable concentricity. When the slide valve 2 extends out of the slide valve cavity 11, the slide valve support 3 moves synchronously with the slide valve 2, so that the inner end of the slide valve 2 ( Figure 3 The right end of the middle valve is supported by the slide valve cavity 11, and the outer end of the slide valve 2 ( Figure 3 The middle left end is supported by the slide valve support part 3, achieving support at both ends. The middle area of ​​the slide valve 2 is partially suspended but does not fluctuate up and down, tilt or shift, and will not rub or jam with the surrounding parts.

[0069] The front end of the valve support 3 forms a stop via its flange 33. When the valve 2 moves outward from the valve cavity 11, the valve support 3 moves along the positioning guide rod 41 with the valve 2 until it reaches the designated position. The end face of the valve 2 is provided with a latch 221. When the valve 2 moves inward from the valve cavity 11, the latch 221 engages with the front end face of the valve support 3, and the valve support 3 moves along the positioning guide rod 41 with the valve 2 until it reaches the designated position. Throughout the entire movement of the valve 2, it is always supported by both ends of the valve cavity 11 and the valve support 3.

[0070] In this embodiment, the length of the slide valve support 3 can be set to be shorter according to the support requirements, so it does not need to be machined as a whole with the slide valve cavity 11, which helps to avoid vibration and ensures machining accuracy.

[0071] The embodiments of this application are generally applicable to screw compressors operating under large differential pressure conditions, so that the slide valve 2 can overcome the resistance caused by the movement of the slide valve support 3 and move smoothly.

[0072] like Figure 4 The illustrated embodiments and Figure 3 The difference in the illustrated embodiment is that the screw compressor also includes a follow-up control device 5, which is configured to control the slide valve support 3 to move in the direction of movement of the slide valve 2.

[0073] like Figure 4 As shown, the follow-up control device 5 includes an elastic element 51 and an electromagnetic device 52. The elastic element 51 is configured to apply an axial force to the spool valve support 3 that tends to move away from the spool valve cavity 11. The electromagnetic device 52 is configured to apply an axial force to the spool valve support 3 that moves towards the spool valve cavity 11. The electromagnetic device 52 is energized or de-energized according to the movement command that controls the movement of the spool valve 2.

[0074] like Figure 4 As shown, both the slide valve support 3 and the housing 1 are equipped with electromagnetic devices 52. The electromagnetic devices 52 include electromagnetic coils, iron cores, etc. A helical spring is installed between the slide valve support 3 and the housing 1 as an elastic element 51 and is sleeved on the positioning guide rod 41. When the slide valve 2 moves to the outside of the slide valve cavity 11 ( Figure 4 When the valve 2 moves to the left side of the valve chamber 11, the control device de-energizes the electromagnetic device 52, the magnetic force disappears, and the valve support 3 moves outward along the positioning guide rod 41 under the force of the helical spring. Figure 4 When the valve moves (to the right of the valve), the control device energizes the electromagnetic device 52, generating an attraction force. The magnetic force overcomes the force of the helical spring, causing the valve support 3 and the valve 2 to move inward along the positioning guide rod 41. Because the valve support 3 is guided with high precision by the positioning guide rod 41, it can remain concentric with the valve cavity 11 whether it is energized for engagement or de-energized for release, ensuring stable and reliable support.

[0075] The control device may be implemented, for example, as a general-purpose processor, a programmable logic controller (PLC), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or any suitable combination thereof for performing the functions described in this disclosure.

[0076] The embodiments of this application can be adapted to screw compressors under all operating conditions by matching the elastic force of the elastic element and the magnetic force of the electromagnetic device.

[0077] Figure 4 For any parts not described in the illustrated embodiments, please refer to [the relevant documentation]. Figure 3 The relevant description of the illustrated embodiment.

[0078] As can be seen from the above description, in the screw compressor of this application embodiment, the slide valve support is no longer fixed relative to the slide valve cavity, but moves synchronously with the slide valve, always providing effective support for the extended end of the slide valve. The guide mounting part can ensure that the slide valve support and the slide valve cavity are coaxial in height, and has at least one of the following advantages:

[0079] The length of the valve support can be shorter and it can be machined separately from the valve cavity, eliminating the need for the valve support and valve cavity to be machined as a single, extra-long unit. This avoids the problem of vibration from long cutting tools and makes it easier to ensure the coaxiality of the valve support and valve cavity, thus resolving the contradiction between the length of the valve support and machining accuracy.

[0080] The slide valve operates more stably and reliably. Throughout its entire stroke, the slide valve is supported at both ends, preventing it from shaking, tilting, scraping, or jamming.

[0081] The support stroke of the slide valve support is unrestricted, and the slide valve support moves with the slide valve, which can meet the needs of screw compressors with ultra-long stroke and large length-to-diameter ratio.

[0082] It has high guiding accuracy. For example, the movement deviation of the slide valve support part can be controlled to the micrometer level through the cooperation of the positioning guide rod and the guide hole. The coaxiality stability between the slide valve support part and the slide valve cavity is relatively high.

[0083] Setting up a follow-up control device can effectively solve the problem that the resistance generated by the valve support and the valve follow-up will affect the movement of the valve in the opposite direction.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and not to limit them; although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this application or equivalent substitutions can be made to some technical features, all of which should be covered within the scope of the technical solutions claimed in this application.

Claims

1. A screw compressor, characterized in that, include: The housing (1) has a slide valve chamber (11); The slide valve (2) includes a main valve section (21) that is slidably disposed in the slide valve cavity (11) along the axial direction. A valve support (3) is fixedly connected to one end of the valve (2) along the axial direction relative to the valve (2); and The guide mounting part (4) is used to movably mount the slide valve support part (3) on the housing (1) along the axial direction.

2. The screw compressor according to claim 1, characterized in that, The guide mounting part (4) includes: A first guide structure is mounted on one of the housing (1) and the slide valve support (3); and The second guide structure is installed on the other side of the housing (1) and the slide valve support (3), and is movably fitted with the first guide structure along the axial direction.

3. The screw compressor according to claim 2, characterized in that, One of the first guide structure and the second guide structure includes a positioning guide rod (41) extending along the axial direction. The other of the first guide structure and the second guide structure includes a guide hole (42) extending along the axial direction. The positioning guide rod (41) passes through the guide hole (42) and is slidably engaged with the guide hole (42). One of the first guide structure and the second guide structure includes a guide rail extending along the axial direction; the other of the first guide structure and the second guide structure includes a guide block that slides with the guide rail; or One of the first guide structure and the second guide structure includes a guide rail that extends along the axial direction, and the other of the first guide structure and the second guide structure includes a roller that rolls in cooperation with the guide rail.

4. The screw compressor according to claim 1, characterized in that, It also includes a follow-up control device (5), which is configured to control the slide valve support (3) to move in the direction of movement of the slide valve (2).

5. The screw compressor according to claim 4, characterized in that, The follow-up control device (5) includes: The elastic element (51) is configured to apply a force along the axial direction tending away from the valve cavity (11) to the valve support (3); and An electromagnetic device (52) is configured to apply a force along the axial direction toward the valve cavity (11) to the valve support (3), and the electromagnetic device (52) is energized or de-energized according to a movement command that controls the movement of the valve (2).

6. The screw compressor according to claim 1, characterized in that, The slide valve support (3) is snapped into the slide valve (2).

7. The screw compressor according to any one of claims 1 to 6, characterized in that, The slide valve (2) includes a mounting section (22), which is located at one end of the main valve section (21) along the axial direction near the slide valve support (3), and the slide valve support (3) is mounted on the mounting section (22).

8. The screw compressor according to claim 7, characterized in that, The valve support (3) includes a support plate (31), which is disposed on the outer periphery of the mounting section (22) and includes a support surface (311) that matches the shape of the outer periphery of the mounting section (22).

9. The screw compressor according to claim 8, characterized in that, The pallet (31) includes a flange (33), which is arranged radially inside the support surface (311) along the radial direction of the screw compressor, located at the axial outer end of the mounting section (22) away from the main valve section (21) and abutting against the corresponding end face of the mounting section (22). The mounting section (22) includes a buckle (221), which has a snap-fit ​​state and includes a latch (2211). In the snap-fit ​​state, the latch (2211) is disposed at the axial outer end of the flange (33) and abuts against the flange (33).

10. A refrigeration circuit, characterized in that, The screw compressor includes any one of claims 1 to 9.

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