Slide valve device of screw compressor

Abstract

The utility model discloses a slide valve device of a screw compressor, which belongs to the technical field of slide valves and comprises a cylinder shell, a piston head arranged inside the cylinder shell, a piston rod arranged at the center of one end face of the piston head, a slide valve fixed at one end of the piston rod far away from the piston head, and an overhauling mechanism arranged on one side of the slide valve. The overhauling mechanism comprises a fixed sleeve, an ejection operating rod and an adjusting gear, the fixed sleeve is arranged in the screw compressor shell, the ejection operating rod is arranged in the fixed sleeve in a sliding and penetrating mode, the adjusting gear is arranged in the fixed sleeve, and an extension adjusting mechanism is arranged on the front side of the fixed sleeve; the extension adjusting mechanism comprises a drawing toothed plate, a guide sliding arm and a shell mounting plate; according to the utility model, through the arranged maintenance mechanism, the piston head can be controlled to break through the maximum stroke in the cylinder shell and extend out of the port of the cylinder shell, and the maintenance operation space is expanded in a manner of keeping the piston head exposed so as to reduce the disassembly and assembly difficulty.

Description

Technical Field

[0001] The utility model belongs to the technical field of slide valves, and in particular relates to a slide valve device for a screw compressor. Background Art

[0002] Screw compressors are widely used in refrigeration and air-conditioning systems. In working state, due to the influence of external climate conditions and changes in working cold and hot loads, screw compressors will operate in a larger compression ratio range, resulting in under-compression or over-compression. Therefore, various forms of energy regulation mechanisms are used in screw compressors to enable the compressor to adapt to different working conditions and improve operating efficiency. The sliding valve adjustment device used in the screw compressor is generally driven by a piston installed at the bottom of the body to drive the piston rod, and then the piston rod pulls the sliding valve for adjustment.

[0003] At present, the spring of the balancing component of the adjusting device is installed between the lower part of the machine body and the piston head. The piston head needs to be replaced urgently due to wear caused by long-term use. However, the piston cylinder housing is fixed to the screw compressor housing, and there is a connection between the piston head seat and the machine body with a balancing spring, which makes the replacement of the piston head cumbersome and difficult. In addition, the piston head will be accommodated in the piston cylinder housing due to the influence of the balancing spring. The small operating space inside the piston cylinder housing makes the replacement of the piston head further difficult.

[0004] Therefore, a screw compressor sliding valve device is needed to solve the problem that the replacement operation of the piston head of the sliding valve device in the prior art is complicated and difficult. Utility Model Content

[0005] The purpose of the utility model is to provide a sliding valve device for a screw compressor to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a screw compressor sliding valve device, comprising a cylinder housing, a piston head is arranged inside the cylinder housing, a piston rod is arranged at the center of one end surface of the piston head, a sliding valve is fixed to the end of the piston rod away from the piston head, and a maintenance mechanism is arranged on one side of the sliding valve, the maintenance mechanism comprises a fixed sleeve, an ejection operating rod and an adjusting gear, the fixed sleeve is arranged in the screw compressor housing, the ejection operating rod is slidably penetrated inside the fixed sleeve, the adjusting gear is arranged inside the fixed sleeve, an extension adjustment mechanism is arranged on the front side of the fixed sleeve, the extension adjustment mechanism comprises a pull-out tooth plate, a guide slide arm and a housing mounting plate, a guide slide groove is opened on one side surface of the pull-out tooth plate, the pull-out tooth plate is slidably connected in the guide slide groove of the fixed sleeve, the guide slide arm is slidably connected to the back of the pull-out tooth plate, and the housing mounting plate is fixed to the end of the guide slide arm away from the pull-out tooth plate.

[0007] It should be noted in the solution that a guide slide bar is fixed to the surface of the ejection operating rod, and a guide slide groove matching the ejection operating rod and the guide slide bar combination is formed on one end surface of the slide valve.

[0008] It is further worth noting that an adjustment operation port is provided inside the fixed sleeve, and the adjustment gear is rotatably connected in the adjustment operation port of the fixed sleeve.

[0009] It should be further explained that the surface of the ejection operating rod is provided with a positioning spiral pattern, and the center of one end surface of the adjusting gear is provided with a positioning screw hole.

[0010] As a preferred embodiment, the adjusting gear is threadedly connected to the adjusting spiral pattern, an adjusting rack is provided on one side surface of the pulling tooth plate, and the adjusting rack of the pulling tooth plate is meshedly connected to the adjusting gear.

[0011] As a preferred embodiment, one end of the fixed sleeve away from the slide valve is fixed to the center of one side surface of a shell mounting plate, and the shell mounting plate is fixed to the outlet side wall of the screw compressor shell.

[0012] As a preferred implementation, a pulling handle is fixed to the lower end of the pulling tooth plate, and the lower part of the pulling tooth plate extends out of the outlet of the screw compressor housing.

[0013] As a preferred embodiment, a rear end cover is provided at one end of the cylinder housing, a balance spring is sleeved on the surface of the piston rod, one end of the balance spring is fixed to the piston head, the other end of the balance spring is fixed to the screw compressor housing, and the cylinder housing is fixed to the screw compressor housing.

[0014] Compared with the prior art, the screw compressor slide valve device provided by the utility model has at least the following beneficial effects:

[0015] (1) Through the set maintenance mechanism, the piston head can be controlled to break through the maximum stroke in the cylinder housing and extend out of the port of the cylinder housing. The method of keeping the piston head exposed expands the maintenance operation space to reduce the difficulty of disassembly and assembly.

[0016] (2) Through the extended adjustment mechanism, when controlling the movement of the ejection operating lever, the rotation adjustment operation of the adjusting gear can be controlled by pulling the pull-out tooth plate, so that the maintenance state of the piston head can be switched from the outlet of the screw compressor shell, thereby further improving the convenience of the maintenance and replacement operation of the piston head. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 This is a three-dimensional diagram of the overall structure of a screw compressor slide valve device of the utility model;

[0019] Figure 2 This is a three-dimensional diagram of the ejection operating rod structure of a screw compressor sliding valve device of the utility model;

[0020] Figure 3 This is a three-dimensional diagram of the regulating gear structure of a screw compressor sliding valve device of the utility model;

[0021] Figure 4 The utility model is a stereoscopic diagram of the ejection operating rod and the regulating gear structure of a screw compressor sliding valve device.

[0022] In the figure: 1. Cylinder housing; 2. Piston rod; 3. Sliding valve; 4. Rear end cover; 5. Balance spring; 6. Fixed sleeve; 7. Ejection operating rod; 8. Guide slide; 9. Adjustment operating port; 10. Adjustment gear; 11. Adjustment spiral pattern; 12. Adjustment screw hole; 13. Housing mounting plate; 14. Pull-out tooth plate; 15. Guide slide arm; 16. Guide slide groove; 17. Pull-out handle; 18. Adjustment rack; 19. Guide slide groove. DETAILED DESCRIPTION

[0023] The present invention will be further described below in conjunction with the embodiments.

[0024] See also Figure 1-4 The utility model provides a sliding valve device for a screw compressor, including a cylinder housing 1, a piston head is arranged inside the cylinder housing 1, a piston rod 2 is arranged at the center of one end surface of the piston head, a sliding valve 3 is fixed to the end of the piston rod 2 away from the piston head, and a maintenance mechanism is arranged on one side of the sliding valve 3, the maintenance mechanism includes a fixed sleeve 6, an ejection operating rod 7 and an adjusting gear 10, the fixed sleeve 6 is arranged in the screw compressor shell, the ejection operating rod 7 is slidably penetrated inside the fixed sleeve 6, the adjusting gear 10 is arranged inside the fixed sleeve 6, and an extension adjustment mechanism is arranged on the front side of the fixed sleeve 6, the extension adjustment mechanism includes a pull-out tooth plate 14, a guide slide arm 15 and a housing mounting plate 13, a guide slide groove 16 is opened on one side surface of the pull-out tooth plate 14, the pull-out tooth plate 14 is slidably connected in the guide slide groove 16 of the fixed sleeve 6, the guide slide arm 15 is slidably connected to the back of the pull-out tooth plate 14, and the housing mounting plate 13 is fixed to the end of the guide slide arm 15 away from the pull-out tooth plate 14.

[0025] Further as Figure 1 , Figure 2 and Figure 3 As shown, it is worth to explain in detail that a guide slide bar 8 is fixed on the surface of the ejection operating rod 7, and a guide slide groove 19 matching with the combination of the ejection operating rod 7 and the guide slide bar 8 is opened on one end surface of the slide valve 3.

[0026] Further as Figure 3 As shown, it is worth to explain in detail that an adjustment operation opening 9 is provided inside the fixed sleeve 6 , and the adjustment gear 10 is rotatably connected in the adjustment operation opening 9 of the fixed sleeve 6 .

[0027] This scheme has the following working process: when in use, when the piston head translates toward the screw compressor housing, the sliding valve 3 slides in the housing and can continuously reduce the exhaust port of the housing. On the contrary, when the piston head moves away from the screw compressor housing, the sliding valve 3 can be controlled to continuously open the exhaust port. When inspecting and replacing the piston head, first remove the rear end cover 4 at one end of the cylinder housing 1. Since the piston head is inside the cylinder housing 1, it affects the inspection and replacement. At this time, the adjusting gear 10 is controlled to rotate at the adjusting operating port 9 of the fixed sleeve 6, and the ejection operating rod 7 threadedly connected to the adjusting gear 10 can extend outward along the fixed sleeve 6 until the ejection operating rod 7 is pressed tightly and pushes the sliding valve 3 inward, so that the piston head is controlled to break through the maximum stroke in the cylinder housing 1 and extend out of the port of the cylinder housing 1. The method of keeping the piston head exposed expands the inspection and operation space to reduce the difficulty of disassembly and assembly.

[0028] According to the above working process, it can be known that the piston head can be controlled to break through the maximum stroke in the cylinder housing 1 and extend out of the port of the cylinder housing 1. The method of keeping the piston head exposed expands the maintenance operation space to reduce the difficulty of disassembly and assembly.

[0029] Further as Figure 1 , Figure 2 and Figure 4 As shown, it is worth to explain in detail that the surface of the ejection operating rod 7 is provided with a positioning spiral pattern 11, and the center of one end surface of the adjusting gear 10 is provided with a positioning screw hole 12.

[0030] Further as Figure 4 As shown, it is worth explaining in detail that the adjusting gear 10 is threadedly connected with the adjusting spiral pattern 11, and an adjusting rack 18 is provided on one side surface of the pulling-out gear plate 14. The adjusting rack 18 of the pulling-out gear plate 14 is meshedly connected with the adjusting gear 10. During the control of the movement of the ejection operating lever 7, the rotation adjustment operation of the adjusting gear 10 can be controlled by pulling the pulling-out gear plate 14. At the same time, the pulling-out gear plate 14 extends out of the outlet of the screw compressor shell, so that the maintenance state of the piston head can be switched from the outlet of the screw compressor shell, thereby further improving the convenience of the maintenance and replacement operations of the piston head.

[0031] Further as Figure 1 As shown, it is worth to explain in detail that one end of the fixed sleeve 6 away from the slide valve 3 is fixed at the center of one side surface of the shell mounting plate 13, and the shell mounting plate 13 is fixed on the outlet side wall of the screw compressor shell.

[0032] Further as Figure 1 As shown, it is worth to explain in detail that a pull-out handle 17 is fixed to the lower end of the pull-out tooth plate 14, and the lower part of the pull-out tooth plate 14 extends out of the outlet of the screw compressor shell.

[0033] Further as Figure 1 As shown, it is worth explaining in detail that a rear end cover 4 is provided at one end of the cylinder housing 1, a balance spring 5 is sleeved on the surface of the piston rod 2, one end of the balance spring 5 is fixed to the piston head, and the other end of the balance spring 5 is fixed to the screw compressor housing, and the cylinder housing 1 is fixed to the screw compressor housing.

[0034] In summary: the piston head can be controlled to break through the maximum stroke in the cylinder housing 1 and extend out of the port of the cylinder housing 1, and the method of keeping the piston head exposed expands the maintenance operation space to reduce the difficulty of disassembly and assembly; in the process of controlling the movement of the ejection operating rod 7, the rotation adjustment operation of the adjusting gear 10 can be controlled by pulling the pull-out tooth plate 14, so that the maintenance state of the piston head can be switched from the outlet of the screw compressor shell, thereby further improving the convenience of the maintenance and replacement operation of the piston head.

[0035] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A screw compressor sliding valve device, comprising a cylinder housing (1), a piston head is arranged inside the cylinder housing (1), a piston rod (2) is arranged at the center of one end surface of the piston head, and is characterized in that: A slide valve (3) is fixed to the end of the piston rod (2) away from the piston head. A maintenance mechanism is arranged on one side of the slide valve (3). The maintenance mechanism comprises a fixed sleeve (6), an ejection operating rod (7) and an adjusting gear (10). The fixed sleeve (6) is arranged in the screw compressor housing. The ejection operating rod (7) is slidably inserted into the interior of the fixed sleeve (6). The adjusting gear (10) is arranged in the interior of the fixed sleeve (6). An extension adjusting gear (10) is arranged on the front side of the fixed sleeve (6). The extension adjustment mechanism comprises a pull-out tooth plate (14), a guide slide arm (15) and a shell mounting plate (13); a guide slide groove (16) is provided on one side surface of the pull-out tooth plate (14); the pull-out tooth plate (14) is slidably connected in the guide slide groove (16) of the fixed sleeve (6); the guide slide arm (15) is slidably connected to the back of the pull-out tooth plate (14); and the shell mounting plate (13) is fixed to one end of the guide slide arm (15) away from the pull-out tooth plate (14).

2. A screw compressor sliding valve device according to claim 1, characterized in that: A guide slide bar (8) is fixed on the surface of the ejection operating rod (7), and a guide slide groove (19) matching the ejection operating rod (7) and the guide slide bar (8) is provided on one end surface of the slide valve (3).

3. A screw compressor sliding valve device according to claim 2, characterized in that: An adjustment operation port (9) is provided inside the fixed sleeve (6), and the adjustment gear (10) is rotatably connected in the adjustment operation port (9) of the fixed sleeve (6).

4. A screw compressor sliding valve device according to claim 3, characterized in that: The surface of the ejection operating rod (7) is provided with a positioning spiral pattern (11), and the center of one end surface of the adjusting gear (10) is provided with a positioning screw hole (12).

5. A screw compressor sliding valve device according to claim 4, characterized in that: The adjusting gear (10) is threadedly connected to the adjusting spiral pattern (11); an adjusting rack (18) is provided on one side surface of the pulling tooth plate (14); and the adjusting rack (18) of the pulling tooth plate (14) is meshingly connected to the adjusting gear (10).

6. A screw compressor sliding valve device according to claim 5, characterized in that: One end of the fixed sleeve (6) away from the slide valve (3) is fixed to the center of one side surface of a shell mounting plate (13), and the shell mounting plate (13) is fixed to the outlet side wall of the screw compressor shell.

7. A screw compressor sliding valve device according to claim 6, characterized in that: A pulling handle (17) is fixed to the lower end of the pulling tooth plate (14), and the lower part of the pulling tooth plate (14) extends out of the outlet of the screw compressor shell.

8. A screw compressor sliding valve device according to claim 7, characterized in that: A rear end cover (4) is provided at one end of the cylinder housing (1), a balance spring (5) is sleeved on the surface of the piston rod (2), one end of the balance spring (5) is fixed to the piston head, the other end of the balance spring (5) is fixed to the screw compressor housing, and the cylinder housing (1) is fixed to the screw compressor housing.

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