Roots screw composite vacuum unit

Abstract

The utility model discloses a Roots screw composite vacuum unit, and relates to the related technical field of vacuum pumps. The screw pump comprises a roots pump body and a screw pump body located under the roots pump body. A cross-shaped pipeline is connected to a port position between the roots pump body and the screw pump body, an inserting rod which is slidably inserted from a left port position of the cross-shaped pipeline is arranged in the cross-shaped pipeline, a filter cartridge is slidably inserted in a mounting hole, a filter plate is arranged in the middle position in the filter cartridge, and a blocking ring plate is fixed to the end position of an upper port of the cross-shaped pipeline; and a limiting ring plate is fixed in the upper end opening of the cross-shaped pipeline under the blocking ring plate, a backflow preventing plate is inserted into the blocking ring plate, and a first spring is fixed between the abutting ring plate and the cross-shaped plate. The filter plate can be conveniently detached and replaced by taking out the inserting rod from the interior of the cross-shaped pipeline, and meanwhile gas backflow can be effectively avoided through matched use of the first spring and the backflow prevention plate.

Description

Technical Field

[0001] The utility model belongs to the technical field related to vacuum pumps, in particular to a Roots screw composite vacuum unit. Background Art

[0002] Roots water ring vacuum unit overcomes the disadvantages of extreme pressure difference and low pumping rate under certain pressure when using a single water ring pump, while retaining the advantages of Roots pump that it can work quickly and has a large pumping rate. It is especially suitable for pumping out a large amount of condensable steam, especially when the gas ballast oil seal mechanical vacuum pump is not capable of removing condensable steam, or the solvent used can deteriorate the pump oil and affect the performance, or the vacuum system does not allow oil pollution.

[0003] However, when the existing Roots screw compound vacuum unit is in use, a corresponding filter structure is installed between the Roots pump and the screw pump. However, since the filter structure cannot be easily disassembled and replaced, the filter structure is easily blocked after long-term use, and thus cannot continue to filter. At the same time, when the Roots screw compound vacuum unit is in use, since it does not have the function of preventing gas backflow, there will be airflow backflow, resulting in reduced vacuum work quality. To this end, we provide a Roots screw compound vacuum unit to solve the above problems. Utility Model Content

[0004] The utility model aims to provide a Roots screw compound vacuum unit, which can facilitate the disassembly and replacement of the filter plate by taking out the plug-in rod from the inside of the cross pipe, and at the same time, the coordinated use of the spring and the anti-backflow plate can effectively avoid the backflow of gas.

[0005] In order to solve the above technical problems, the utility model is realized by the following technical solutions:

[0006] The utility model discloses a Roots screw compound vacuum unit, comprising a Roots pump body and a screw pump body located directly below the Roots pump body; a cross pipe is connected to the port position between the Roots pump body and the screw pump body, a plug rod which is slidably inserted from the left port position is arranged inside the cross pipe, a mounting hole which is connected with the upper and lower ports of the cross pipe is penetrated through the peripheral side of the plug rod, a filter cartridge is slidably plugged inside the mounting hole, a filter plate is arranged at the middle position inside the filter cartridge, a blocking ring plate is fixed at the end position of the upper port of the cross pipe, a limiting ring plate is fixed inside the upper port of the cross pipe directly below the blocking ring plate, a backflow prevention plate is plugged inside the blocking ring plate, a cross plate is fixed to the lower end face of the backflow prevention plate, an abutting ring plate which is connected with the upper end face of the limiting ring plate is arranged directly below the cross plate, and a spring is fixed between the abutting ring plate and the cross plate.

[0007] The utility model is further configured such that the left end face of the cross pipe is provided with four positioning holes evenly distributed in a ring shape, the left end portion of the plug-in rod is fixed with a positioning ring plate connected to the left end face of the cross pipe, and the right end face of the positioning ring plate is fixed with a positioning rod plugged into the internal position of the positioning hole.

[0008] The utility model is further configured that a ring groove connected with the inside of the mounting hole is provided at the middle position of the peripheral side of the plug-in rod, and two semicircular plates in a combined cylindrical state are arranged inside the ring groove.

[0009] The utility model is further configured that clamping rods are fixed to the left and right parts of the inner side of the semicircular plate located in front and behind the installation hole, and plugging holes for matching with the clamping rods are opened at the positions of the peripheral sides of the annular groove corresponding to the clamping rods.

[0010] The utility model is further configured that an abutment cylinder connected with the inside of the cross pipe is fixed to the middle of the inner side surface of the semicircular plate, and the abutment cylinder is slidably inserted in the filter cylinder and clamps the filter plate in the filter cylinder.

[0011] The utility model is further configured such that four limiting rods evenly distributed in a ring shape are fixed at the position between the blocking ring plate and the limiting ring plate, the cross plate is sleeved on the limiting rod through the sleeve holes provided therein, and the abutting ring plate is sleeved on the limiting rod through the limiting holes provided therein.

[0012] The utility model is further configured such that the right end face of the plug-in rod is provided with two square openings which are symmetrically arranged front and back, the front and rear parts of the right end face of the cross pipe are provided with assembly openings at positions corresponding to the square openings, and the inside of the square openings are slidably provided with assembly blocks which are inserted into the internal positions of the assembly openings.

[0013] The utility model is further configured that the end faces opposite to the two square openings are each provided with a through hole, and the inner end faces of the through holes are each provided with a movable circular opening.

[0014] The utility model is further configured such that the end faces of the assembly blocks are fixed with movable rods that slide through the inner position of the through hole, the other end faces of the movable rods are fixed with round blocks that slide in the inner position of the movable circular opening, and the other end faces of the round blocks are fixed with springs 2 that are connected to the inner end faces of the movable circular opening.

[0015] The utility model has the following beneficial effects:

[0016] 1. When the utility model is in use, the plug rod is taken out from the inside of the cross pipe to expose the annular groove, and the semicircular plate can be taken out from the inside of the annular groove to expose the filter plate. At this time, the filter plate can be directly taken out from the inside of the filter cartridge to realize the replacement of the filter plate.

[0017] 2. When the utility model is in use, the Roots pump body sucks in the gas, and then the gas flows into the screw pump body from the cross pipe. When the gas enters the cross pipe, it pushes the anti-backflow plate, causing the anti-backflow plate to move in the direction of the limiting ring plate, thereby connecting the interior of the filter cartridge with the interior of the blocking ring plate. When the gas is no longer sucked in, the spring pushes the cross plate to reconnect with the blocking ring plate, so that the anti-backflow plate is reinserted into the blocking ring plate, thereby blocking the blocking ring plate and preventing the backflow of gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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.

[0019] Figure 1 The figure is a schematic diagram of the structure of a Roots screw compound vacuum unit.

[0020] Figure 2 It is a combined diagram of the cross pipe, the plug-in rod and the backflow prevention plate in the utility model.

[0021] Figure 3 The utility model is an assembly diagram of the plug-in rod, the assembly block, the semicircular plate and the filter cartridge.

[0022] Figure 4 This is the internal structure diagram of the cross pipe in the utility model.

[0023] Figure 5 It is an assembly diagram of the semicircular plate, filter cartridge and filter plate in the utility model.

[0024] Figure 6 It is a structural diagram of the anti-backflow plate in the utility model.

[0025] Figure 7 It is a cross-sectional view of the plug-in rod in the utility model.

[0026] Figure 8 It is a structural diagram of the assembly block in the utility model.

[0027] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0028] 1-Roots pump body, 2-screw pump body, 3-cross pipe, 301-positioning hole, 302-assembly port, 303-limiting ring plate, 304-blocking ring plate, 305-limiting rod, 4-plugging rod, 401-positioning ring plate, 402-positioning rod, 403-ring groove, 404-plugging hole, 405-mounting hole, 406-square mouth, 407-through hole, 408-movable round mouth, 5-anti-backflow plate, 501-abutment ring plate, 502-limiting hole, 503-spring one, 504-cross plate, 505-sleeve hole, 6-assembly block, 601-movable rod, 602-round block, 603-spring two, 7-semicircular plate, 701-clamping rod, 702-abutment cylinder, 8-filter cylinder, 9-filter plate. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Specific embodiment 1

[0031] See also Figure 1-Figure 8 The utility model is a Roots screw compound vacuum unit. By taking out the plug-in rod 4 from the inside of the cross pipe 3, the filter plate 9 can be easily disassembled and replaced. At the same time, the spring 503 and the anti-backflow plate 5 are used in combination to effectively avoid the backflow of gas.

[0032] Specifically, a Roots pump body 1 and a screw pump body 2 located directly below it; a cross pipe 3 is connected to the port position between the Roots pump body 1 and the screw pump body 2, a plug-in rod 4 is arranged inside the cross pipe 3 and is slidably inserted from its left port position, a mounting hole 405 connected to the upper and lower ports of the cross pipe 3 is penetrated through the circumference of the plug-in rod 4, a filter cartridge 8 is slidably inserted inside the mounting hole 405, a filter plate 9 is arranged at the middle position inside the filter cartridge 8, a blocking ring plate 304 is fixed at the end position of the upper port of the cross pipe 3, a limiting ring plate 303 is fixed inside the upper port of the cross pipe 3 directly below the blocking ring plate 304, an anti-backflow plate 5 is inserted inside the blocking ring plate 304, a cross plate 504 is fixed to the lower end surface of the anti-backflow plate 5, a contact ring plate 501 connected to the upper end surface of the limiting ring plate 303 is arranged directly below the cross plate 504, and a spring 503 is fixed between the contact ring plate 501 and the cross plate 504.

[0033] The operation process of this embodiment is as follows: through the use of the above-mentioned structure, when the Roots screw compound vacuum unit is used, the Roots pump body 1 sucks in the gas, and then the gas flows from the cross pipe 3 into the screw pump body 2. When the gas enters the cross pipe 3, it pushes the anti-backflow plate 5, so that the anti-backflow plate 5 moves in the direction of the limiting ring plate 303, thereby connecting the interior of the filter cartridge 8 with the interior of the blocking ring plate 304. When the gas is no longer sucked in, the spring 1 503 pushes the cross pipe 3. Plate 504 is reconnected with the sealing ring plate 304, so that the anti-backflow plate 5 is reinserted into the sealing ring plate 304, thereby blocking the sealing ring plate 304 and preventing the backflow of gas. At the same time, when the filter plate 9 needs to be replaced, the connecting rod 4 can be taken out from the inside of the cross pipe 3 to expose the annular groove 403, and the semicircular plate 7 can be removed from the inside of the annular groove 403 to expose the filter plate 9. At this time, the filter plate 9 can be directly taken out from the inside of the filter tube 8 to realize the replacement of the filter plate 9. Specific embodiment 2

[0035] See also Figure 3 , Figure 4 , Figure 5 and Figure 7 On the basis of the first specific embodiment, by inserting the positioning rod 402 into the positioning hole 301, the insertion rod 4 can be prevented from rotating due to position deviation inside the cross pipe 3.

[0036] Specifically, four positioning holes 301 are evenly distributed in a ring shape on the left end face of the cross pipe 3, a positioning ring plate 401 connected to the left end face of the cross pipe 3 is fixed to the left end portion of the plug-in rod 4, a positioning rod 402 plugged into the internal position of the positioning hole 301 is fixed to the right end face of the positioning ring plate 401, an annular groove 403 connected to the interior of the mounting hole 405 is provided in the middle position of the peripheral side of the plug-in rod 4, two semicircular plates 7 in a combined cylindrical state are arranged inside the annular groove 403, and clamping rods 701 are fixed to the left and right parts of the inner side of the semicircular plates 7 located in front and behind the mounting hole 405, and plug-in holes 404 for matching with the clamping rods 701 are provided on the peripheral side of the annular groove 403 at positions corresponding to the clamping rods 701.

[0037] The operation process of this embodiment is: by inserting the clamping rod 701 into the plug-in hole 404, the semicircular plate 7 can be initially installed in the annular groove 403. At the same time, after the plug-in rod 4 is slidably inserted into the cross pipe 3, the plug-in rod 4 will drive the positioning ring plate 401 to connect with the left end face of the cross pipe 3, and then the positioning rod 402 on the end face of the positioning ring plate 401 is inserted into the positioning rod 402, so as to avoid the plug-in rod 4 from rotating in a position deviation inside the cross pipe 3. Specific embodiment three

[0039] See also Figure 4 , Figure 5 and Figure 6 On the basis of the first specific embodiment, the filter plate 9 is clamped by two abutment cylinders 702 to ensure that the filter plate 9 is stably located in the filter cylinder 8 .

[0040] Specifically, an abutment cylinder 702 connected to the inside of the cross pipe 3 is fixed in the middle of the inner side of the semicircular plate 7, and the abutment cylinder 702 is slidably inserted in the filter cylinder 8, and the filter plate 9 is clamped in the filter cylinder 8, and four limiting rods 305 evenly distributed in a ring shape are fixed at the position between the sealing ring plate 304 and the limiting ring plate 303, the cross plate 504 is sleeved on the limiting rod 305 through the opened sleeve hole 505, and the abutment ring plate 501 is sleeved on the limiting rod 305 through the opened limiting hole 502.

[0041] The operation process of this embodiment is as follows: since the limiting rod 305 passes through the internal position of the sleeve hole 505 and the limiting hole 502, the limiting rod 305 will limit the abutment ring plate 501 and the cross plate 504, so that the cross plate 504 will not be deviated in position between the limiting ring plate 303 and the blocking ring plate 304, thereby ensuring that the cross plate 504 can be accurately connected with the blocking ring plate 304, and at the same time, when the semicircular plate 7 is sleeved in the internal position of the annular groove 403, the semicircular plate 7 will cause the abutment cylinder 702 to be inserted into the filter cylinder 8, thereby the two abutment cylinders 702 clamp the filter plate 9 to ensure that the filter plate 9 can be stably located in the filter cylinder 8. Specific embodiment 4

[0043] See also Figure 2 , Figure 3 , Figure 7 and Figure 8 On the basis of the first specific embodiment, by moving the assembly block 6 in or out of the internal position of the assembly opening 302, the plug-in rod 4 can be easily assembled and disassembled.

[0044] Specifically, the right end face of the plug-in rod 4 is provided with two square openings 406 which are symmetrically arranged front to back, and the front and rear parts of the right end face of the cross pipe 3 are provided with assembly openings 302 at the positions corresponding to the square openings 406, and the inside of the square openings 406 is slidably provided with assembly blocks 6 which are inserted into the internal position of the assembly openings 302, and the opposite end faces of the two square openings 406 are provided with through holes 407, and the inner end faces of the through holes 407 are provided with movable circular openings 408, and the end faces of the assembly blocks 6 are fixed with movable rods 601 which slide through the internal positions of the through holes 407, and the other end faces of the movable rods 601 are fixed with round blocks 602 which slide in the internal positions of the movable round openings 408, and the other end faces of the round blocks 602 are fixed with springs 603 which are connected to the inner end faces of the movable round openings 408.

[0045] The operation process of this embodiment is: when it is necessary to ensure that the internal position of the plug-in rod 4 in the cross pipe 3 is stable, the assembly block 6 can be completely moved into the square opening 406, whereby the assembly block 6 will push the movable rod 601 to move in the through hole 407, and control the round block 602 to compress the spring 2 603 in the movable round opening 408, and insert the plug-in rod 4 into the cross pipe 3, so that the square opening 406 moves to the internal position of the assembly opening 302, and then the spring 2 603 will push the assembly block 6 in the square opening 406 to be inserted into the assembly opening 302, so that the assembly block 6 limits the plug-in rod 4, so that the plug-in rod 4 is installed in the cross pipe 3, and at the same time, when the plug-in rod 4 is disassembled, the assembly block 6 can be moved out of the assembly opening 302, thereby the plug-in rod 4 can be pushed out of the cross pipe 3.

[0046] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0047] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A Roots screw compound vacuum unit, comprising a Roots pump body (1) and a screw pump body (2) located directly below the Roots pump body; characterized in that: A cross pipe (3) is connected to the port position between the Roots pump body (1) and the screw pump body (2); a plug-in rod (4) is arranged inside the cross pipe (3) and is inserted slidably from the left port position thereof; a mounting hole (405) is provided through the peripheral side of the plug-in rod (4) and is connected to the upper and lower ports of the cross pipe (3); a filter cartridge (8) is inserted slidably inside the mounting hole (405); a filter plate (9) is arranged in the middle position inside the filter cartridge (8); and the end position of the upper port of the cross pipe (3) is fixed. A blocking ring plate (304) is provided, a limiting ring plate (303) is fixed inside the upper end of the cross pipe (3) directly below the blocking ring plate (304), a backflow prevention plate (5) is inserted inside the blocking ring plate (304), a cross plate (504) is fixed to the lower end surface of the backflow prevention plate (5), an abutting ring plate (501) connected to the upper end surface of the limiting ring plate (303) is provided directly below the cross plate (504), and a spring (503) is fixed between the abutting ring plate (501) and the cross plate (504).

2. A Roots screw compound vacuum unit according to claim 1, characterized in that: The left end face of the cross pipe (3) is provided with four positioning holes (301) evenly distributed in a ring shape, the left end of the plug-in rod (4) is fixed with a positioning ring plate (401) connected to the left end face of the cross pipe (3), and the right end face of the positioning ring plate (401) is fixed with a positioning rod (402) plugged into the inner position of the positioning hole (301).

3. The Roots screw compound vacuum unit according to claim 1, characterized in that: An annular groove (403) connected to the inside of the mounting hole (405) is provided at the middle of the peripheral side of the plug-in rod (4), and two semicircular plates (7) in a combined cylindrical state are arranged inside the annular groove (403).

4. A Roots screw compound vacuum unit according to claim 3, characterized in that: Clamping rods (701) are fixed to the left and right parts of the inner side of the semicircular plate (7) located in front and behind the mounting hole (405), and plugging holes (404) for use with the clamping rods (701) are provided on the circumferential side of the annular groove (403) at positions corresponding to the clamping rods (701).

5. The Roots screw compound vacuum unit according to claim 3, characterized in that: An abutment cylinder (702) connected to the interior of the cross pipe (3) is fixed to the middle of the inner side surface of the semicircular plate (7), and the abutment cylinder (702) is slidably inserted into the filter cylinder (8) and clamps the filter plate (9) in the filter cylinder (8).

6. The Roots screw compound vacuum unit according to claim 1, characterized in that: Four limiting rods (305) evenly distributed in a ring shape are fixed at the position between the blocking ring plate (304) and the limiting ring plate (303); the cross plate (504) is sleeved on the limiting rods (305) through the sleeve holes (505); and the abutting ring plate (501) is sleeved on the limiting rods (305) through the limiting holes (502) provided therein.

7. The Roots screw compound vacuum unit according to claim 1, characterized in that: The right end face of the plug-in rod (4) is provided with two square openings (406) arranged symmetrically in front and back, and the front and rear parts of the right end face of the cross pipe (3) are provided with assembly openings (302) at positions corresponding to the square openings (406), and the inside of the square opening (406) is provided with an assembly block (6) which is slidably inserted into the inner position of the assembly opening (302).

8. The Roots screw compound vacuum unit according to claim 7, characterized in that: The opposite end surfaces of the two square openings (406) are each provided with a through hole (407), and the inner end surfaces of the through holes (407) are each provided with a movable circular opening (408).

9. The Roots screw compound vacuum unit according to claim 8, characterized in that: The end surface of the assembly block (6) is fixed with a movable rod (601) that slides through the inner position of the through hole (407), the other end surface of the movable rod (601) is fixed with a round block (602) that slides inside the movable circular opening (408), and the other end surface of the round block (602) is fixed with a spring 2 (603) that is connected to the inner end surface of the movable circular opening (408).

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