Connecting ring for a Root vacuum blower

Abstract

A connecting ring for a Roots vacuum blower, which is installed in at least one end section of a Roots vacuum blower housing to increase the usable volume of the housing. The connecting ring comprises: a frame having a hollow circular structure corresponding to the shape of an end portion of the housing; a front end of the frame having a front flange; a front end surface of the front flange and a rear end thereof having a rear flange; and wherein an outer side of the frame is provided with a plurality of reinforcing ribs formed between the end surfaces of the front flange and the rear flange; and a plurality of grooves are formed between the front flange, the rear flange, and each reinforcing rib.

Description

FIELD OF THE INVENTION

[0001] The present invention relates to a Roots vacuum blower and, more particularly, to a connecting ring in a Roots vacuum blower. BACKGROUND OF THE INVENTION

[0002] Root vacuum blowers are vacuum blowers without internal compression, whose volume is changed by the constant rotation of the rotors. Two rotors rotate synchronously in opposite directions without the use of oil seals or the need for lubrication. Root vacuum blowers offer the advantages of fast suction speed, effective volume utilization, high vacuum, low power consumption, compact design, and stable and reliable operation. Therefore, Root vacuum blowers are widely used in many fields, such as the energy, semiconductor, solar energy, oil and food industries, medicine, etc.

[0003] Due to the diverse applications of Root vacuum blowers, most Root vacuum blowers are designed based on housings rather than specifications. This requires significant labor and material expenditure.

[0004] Blower bodies are the basic components of vacuum blowers. They are manufactured as a single piece. The larger the volume of the blower body, the more difficult it is to manufacture. Cost is the main criterion for market survival.

[0005] To reduce the manufacturing costs of the Root vacuum blower, the inventor of the present invention offers a connecting ring that can be connected to the fan body of a Root vacuum blower, thus extending the length of the Root vacuum blower. This allows manufacturers to develop only one dedicated pump body that can be connected to connecting rings of different sizes to form various pump bodies of different sizes. This significantly reduces the manufacturing costs of Root vacuum blowers. SUMMARY OF THE INVENTION

[0006] The aim of the present invention is therefore to provide a connecting ring for a Root vacuum blower. The advantages of the invention are that the connecting ring expands the volume of the Root vacuum blower. By assembling the Root vacuum blower with the connecting ring, a new type of Root vacuum blower is created with different blower sizes and vacuum capacities, which meet the requirements of different market specifications. This allows Root vacuum blowers to be manufactured in a modular manner. This is advantageous for parts purchasing, assembly, quality control, and cost reduction.

[0007] To achieve this object, the present invention provides a connecting ring for a Roots vacuum blower. The connecting ring is installed in at least one end portion of a casing of a Roots vacuum blower to increase the effective volume of the casing. The connecting ring includes: a frame having a hollow circular structure corresponding to the shape of an end portion of the casing; a front end of the frame is provided with a front flange; a front end surface of the front flange and a rear end thereof are provided with a rear flange; and an outer side of the frame is provided with a plurality of reinforcing ribs formed between the end surfaces of the front and rear flanges; and a plurality of grooves are formed between the front flange, the rear flange, and each reinforcing rib. BRIEF DESCRIPTION OF THE ILLUSTRATIONS Fig. shows a front view of the connecting ring according to the invention. Fig. shows a rear view of the connecting ring according to the invention. Fig. shows a perspective view of the connection between the connecting ring and a Root vacuum blower according to the invention. Fig. shows a schematic view of the connection between the connecting ring and the first O-ring. Fig. shows a schematic view of the connection between the connecting ring and the end cover according to the invention. Fig. shows an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0008] For a better understanding of the present invention, it is described in detail below. These descriptions and the accompanying drawings are intended only to assist in understanding the objects, features, and characteristics of the present invention and do not limit its scope and spirit as defined by the appended claims.

[0009] In the Fig. The connecting ring for a Root vacuum blower according to the invention is shown. The connecting ring 100 is mounted in an end section of the housing 2 of a Root vacuum blower 1. It serves to expand the usable volume of the Root vacuum blower 1. One end section of the housing 2 of the Root vacuum blower 1 is connected to the connecting ring 100. However, each of the two end sections of the Root vacuum blower 1 can be connected to its own connecting ring 100. The length of the connecting ring 100 is freely selectable; it is preferably 140 nm.

[0010] According to Fig. The connecting ring 100 comprises the following elements: A frame 101 has a hollow, round structure and is adapted to the shape of the housing 2.

[0011] At the front of the frame 101 is a front flange 3. The end face of the front flange 3 is provided with several screw holes. The front flange 3 is connected to the housing 2 of the Root vacuum blower 1 (see Fig. ). The inner diameter of the frame 101 corresponds to that of the housing 2. Preferably, the inner diameter of the frame 101 is R=220 mm.

[0012] The rear end of the frame 101 is provided with a rear flange 4. The front surface of the rear flange 4 is provided with several screw holes 41. As shown in Fig. As shown, the front surface of the rear flange 4 has a first O-shaped recess 5. This recess 5 is located on the surface with the screw holes 41 and serves for mounting a first O-ring 51. As shown in Fig. As shown, the end face with the O-shaped recess 5 is connected to an end cover 200 to form a final seal.

[0013] The outer side of the frame 101 is provided with a plurality of reinforcing ribs 21, which are arranged between the end faces of the front flange 3 and rear flange 4. Each reinforcing rib 21 runs parallel to the axis of the frame 101. The width of the reinforcing rib 21 is preferably 30 mm. A plurality of grooves are formed between the front flange 3, the rear flange 4, and each reinforcing rib 21. The depth of each groove 2 is preferably 48 mm.

[0014] The grooves 2 serve to reduce the weight of the connecting ring 100 and increase its radiation and flow performance.

[0015] A cooling chamber 6 is located at the bottom of the frame 101. A front 61 and a rear end face 62 of the cooling chamber 6 are flush with the two end faces of the rear flange 4. A left and a right end face of the cooling chamber 6 are located transversely to the front 61 and the rear end face 62 of the cooling chamber 6.

[0016] The underside of the cooling chamber 6 has a second O-shaped recess 7 for receiving a second O-ring 71. The front 61 and rear end surfaces 62 of the cooling chamber 6 are provided with cooling water outlets 82 and a cooling water inlet 81, respectively. During operation, circulating cooling water is fed from the cooling water inlet 81 into the cooling chamber 6 to cool the connecting ring 100 and thus reduce the temperature in the Root vacuum blower 1. The bottom of the cooling chamber 6 is covered with a sealing plate 64 to reduce the temperature in the Root vacuum blower 1. This creates a completely sealed chamber for water cooling.

[0017] The inner wall 103 of the frame 101 has an upper inclined flow guide surface 9 and a lower inclined flow guide surface 10. The inclination angles of the upper inclined flow guide surface 9 and the lower inclined flow guide surface 10 to the inner wall 103 are preferably 17.3°. The interior of the Root vacuum blower 1 has an air inlet and an air outlet. Slotted flow guide surfaces (not shown) are attached to both sides of the Root vacuum blower 1. These two flow guide surfaces are connected by the upper inclined flow guide surface 9 and the lower inclined flow guide surface 10.The upper inclined flow guide surface 9 causes air to flow axially from the air inlet of the Root vacuum blower 1 along the blade shaft to both sides of the blades; the lower inclined flow guide surface 10 causes air in the interior of the Root vacuum blower 1 to flow axially along the blade shaft to the air outlet of the Root vacuum blower 1. Cooling fluid exits the air outlet of the lower inclined flow guide surface 10.

[0018] During assembly, the rear flange 4 is connected to the end cover 200. As shown in Fig.As shown, a plurality of M16 bolts (not shown) pass through the ø18 threaded holes in the end cover 200, the rear flange 4, and the front flange 3 to the bolt holes in the housing 2 of the Root vacuum blower 1. The connecting ring 100 and the Root vacuum blower 1 are connected. Since the connecting ring 100 is not used, the end cover 200 is directly connected to the M16 bolts in the housing 2 of the Root vacuum blower 1.

[0019] The top of the frame 101 has at least one suspension hole 11 for suspending the connecting ring 100.

[0020] During assembly, the Root vacuum blower 1 is assembled with the connecting ring 100. The two end covers 200 are covered on two sides, creating a chamber. The blades and support bearings are mounted with the end covers 200.

[0021] At least one pump base 102 is mounted on the underside of the frame 101.

[0022] The end face of the housing 2 of the Root vacuum blower 1 is sealed by an O-ring. An O-shaped recess (not shown) is provided on one end face of the Root vacuum blower 1. If the connecting ring 100 is not used, the end cover 200 is directly connected to the Root vacuum blower 1 via the O-ring to seal the gap between the Root vacuum blower 1 and the end covers.

[0023] One advantage of the present invention is that the connecting ring increases the volume of the Root vacuum blower. Assembling the Root vacuum blower with the connecting ring creates a new type of Root vacuum blower with different flow rates and vacuum capacities, meeting the requirements of diverse market specifications. This allows the Root vacuum blowers to be manufactured modularly. This is advantageous for parts purchasing, structural assembly, quality control, cost reduction, etc.

[0024] Thus, a connecting ring for a Roots vacuum blower is provided. The connecting ring is installed in at least one end portion of a casing of a Roots vacuum blower to increase the effective volume of the casing. The connecting ring includes a frame with a hollow, circular structure that conforms to the shape of an end portion of the casing. A front end of the frame is provided with a front flange; a front end surface of the front flange and a rear end thereof are provided with a rear flange. An outer side of the frame is provided with a plurality of reinforcing ribs formed between the end surfaces of the front and rear flanges. A plurality of grooves are formed between the front flange, the rear flange, and each reinforcing rib.

[0025] Having described the present invention, it is obvious that it is susceptible to numerous modifications. Such modifications do not constitute a departure from the spirit and scope of the present invention, and all modifications obvious to one skilled in the art are intended to be within the scope of the following claims.

Claims

[1] A connecting ring of a Roots vacuum blower, which is installed in at least one end portion of a Roots vacuum blower housing to increase the usable volume of the housing. The connecting ring comprises: a frame having a hollow circular structure corresponding to the shape of an end portion of the housing; a front end of the frame having a front flange; a front end surface of the front flange and a rear end thereof having a rear flange; and wherein an outer side of the frame is provided with a plurality of reinforcing ribs formed between the end surfaces of the front flange and the rear flange; and a plurality of grooves are formed between the front flange, the rear flange, and each reinforcing rib. [2] A connecting ring of a roots vacuum blower according to claim 1, wherein a front end surface of the front flange is provided with a plurality of screw holes for fixing the casing of the roots vacuum blower. [3] The connecting ring of a Roots vacuum blower according to claim 2, wherein an end face of the rear flange has a first O-shaped recess formed on the surface with screw holes for mounting a first O-ring. During assembly, the end face with the O-shaped recess is combined with an end cover to form a sealed sealing structure. [4] A connecting ring of a Roots vacuum blower according to claim 1, wherein a bottom of the frame includes a cooling chamber; the bottom of the cooling chamber is covered with a sealing plate, thereby forming a complete sealing chamber for water cooling; and front and rear end surfaces of the cooling chamber are flush with two end surfaces of the rear flange; and left and right end surfaces of the cooling chamber are arranged across the front and rear end surfaces of the cooling chamber. [5] A connecting ring of a Roots vacuum blower according to claim 4, wherein the bottom of the cooling chamber has a second O-shaped recess for mounting a second O-ring, and the front and rear end surfaces of the cooling chamber each have a cooling water outlet and a cooling water inlet. [6] A connecting ring of a Roots vacuum blower according to claim 1, wherein the inner wall of the frame has an upper and a lower inclined flow guide surface. [7] A connecting ring of a Root vacuum blower according to claim 6, wherein the angle of inclination of the upper and lower inclined flow guide surfaces to the inner wall is 17.3°. [8] The connecting ring of a roots vacuum blower according to claim 3, wherein the rear flange is connected to the end cover during assembly. A plurality of bolts extend through threaded holes in the end cover, the rear flange, and the front flange to the bolt holes in the body of the roots vacuum blower; the connecting ring and the roots vacuum blower are connected to each other. [9] A connecting ring of a roots vacuum blower according to claim 1, wherein the top of the frame is provided with at least one suspension screw for suspending the connecting ring. [10] A connecting ring of a roots vacuum blower according to claim 1, wherein at least one pump base is attached to the underside of the frame.

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