Connecting structure of screw vacuum pump

Abstract

The utility model provides a connecting structure of a screw vacuum pump, and belongs to the technical field of machinery. The problem of how to improve the connection stability of the bushing is solved. In the connecting structure of the screw vacuum pump, the screw vacuum pump comprises a lining and a pump shell internally provided with a mounting channel, the lining is inserted into the mounting channel, a plurality of retaining ribs abutting against the outer wall of the lining are arranged in the mounting channel in the circumferential direction, and the retaining ribs are arranged at intervals in the length direction of the mounting channel. The connecting structure comprises a plurality of sealing plates and a plurality of welding openings which are formed in the outer side wall of the pump shell at intervals, all the welding openings communicate with the mounting channel, and the welding openings and the maintaining ribs are arranged in a staggered mode in the length direction of the mounting channel. And the multiple sealing plates are welded and fixed to the pump shell and seal the multiple welding openings. The connecting structure of the screw vacuum pump can improve the connecting stability of the bushing.

Description

Technical Field

[0001] The utility model belongs to the technical field of machinery and relates to a connection structure of a screw vacuum pump. Background Art

[0002] The screw vacuum pump is a variable displacement vacuum pump that is more common in today's life. It realizes the suction and exhaust functions by a pair of screws rotating synchronously at high speed in opposite directions in the pump casing.

[0003] For example, a corrosion-resistant screw vacuum pump disclosed in a Chinese patent (authorization announcement number: CN217080785U) includes a shell and a bushing. The bushing is made of a corrosion-resistant metal material. The shell is formed as a whole by casting. The bushing is horizontally inserted into the shell, and the shell and the bushing are fixedly connected by welding, forming a cooling chamber between the shell and the bushing.

[0004] It uses a corrosion-resistant bushing in the outer shell to accommodate components such as the screw, providing shielding for internal parts, thereby reducing the probability of rust on internal parts, thereby improving the strength of the screw vacuum pump and ensuring a longer service life.

[0005] In the description of the reference document, paragraph 0006 states that "the housing and the bushing are fixedly connected by welding". Figure 1 It can be clearly seen that its shell is a circumferentially closed structure with both ends penetrated. That is to say, when the bushing is horizontally inserted into the shell and then subjected to welding, only the two ends of the bushing and the inner walls of the ports at both ends of the shell are welded by solder. However, since the welding points are exposed to the outside for a long time, oxidation corrosion is very likely to occur, which leads to an unstable connection between the bushing and the shell. Summary of the Invention

[0006] The purpose of the utility model is to solve the above problems in the existing technology and propose a connection structure of a screw vacuum pump. The technical problem to be solved by the utility model is: how to improve the connection stability of the bushing.

[0007] The purpose of the utility model can be achieved through the following technical solutions: a connection structure of a screw vacuum pump, the screw vacuum pump includes a sleeve and a pump casing with an installation channel opened inside, the sleeve is inserted in the installation channel, and a plurality of retaining ribs are provided in the installation channel along the circumferential direction and abut against the outer wall of the sleeve, and the plurality of retaining ribs are arranged at intervals along the length direction of the installation channel, and it is characterized in that the connection structure includes a plurality of sealing plates and a plurality of welding ports opened on the outer side wall of the pump casing and arranged at intervals, each of the welding ports is connected to the installation channel, a plurality of the welding ports and a plurality of the retaining ribs are staggered along the length direction of the installation channel, and a plurality of the sealing plates are welded and fixed to the pump casing and the plurality of the welding ports are covered.

[0008] The screw vacuum pump includes a pump casing with an installation channel opened inside and a bushing connected to the installation channel in an inserted manner. Specifically, the bushing is formed by rolling a stainless steel plate, which has high hardness and good anti-rust and anti-corrosion effects. After the insertion work is completed, the bushing is supported by a number of retaining ribs located in the installation channel in the casing and circumferentially limits the bushing in the installation channel. On this basis, the difference between the present application and the prior art is that a number of welding ports are opened on the outer casing so that the side of the installation channel is connected to the outside world, and these welding ports and a number of retaining ribs are staggered along the length direction of the installation channel. That is to say, when welding and fixing the bushing, in addition to welding the two ends of the bushing and the inner walls of the ports at both ends of the installation channel, welding can also be performed on the abutment points between the retaining ribs and the outer wall of the bushing in each welding joint, thereby further improving the connection firmness between the bushing and the pump casing on the original basis, so that it can be firmly positioned in the installation channel. In addition, after completing the welding of the bushing, workers can fix several sealing plates on the pump casing to seal the welding joints by welding, so that the welding points located in the pump casing are completely isolated from the outside world, which can effectively prevent them from being subjected to oxidation corrosion, thereby avoiding unstable connection between the bushing and the outer casing.

[0009] In the aforementioned screw vacuum pump connection structure, the pump housing outer wall includes a plurality of annular retaining grooves, each correspondingly disposed around the plurality of welded openings. The sealing plates are embedded in the retaining grooves and secured by welding to the inner walls of the retaining grooves. The retaining plates can be embedded in the retaining grooves, and the retaining groove walls retain the sealing plates in position, thereby pre-fixing the sealing plates, preventing them from shifting during the welding process and preventing incomplete sealing of the welded openings.

[0010] In the aforementioned screw vacuum pump connection structure, the pump housing outer wall is provided with a plurality of welding openings on both sides of the mounting channel, with the welding openings on one side corresponding to the welding openings on the other side. This further increases the number of weld points within the pump housing for securing the bushing, ensuring that the bushing is securely positioned within the mounting channel.

[0011] In the aforementioned screw vacuum pump connection structure, each of the welding ports, each of the limiting grooves, and each of the sealing plates is quadrilateral, and each of the limiting grooves has an arc-shaped transition at its circumferential corners. The limiting grooves with arc-shaped transitions at their circumferential corners can increase the amount of solder they can accommodate while ensuring the contact area between the inner wall and the sealing plate, thereby ensuring a secure weld to the sealing plate during welding.

[0012] In the aforementioned screw vacuum pump connection structure, the pump housing includes a plurality of cooling cavities surrounding the bushing. The cooling cavities and the retaining ribs are alternately arranged along the length of the mounting channel. Coolant can be filled into the cooling cavities, allowing the bushing to act as a heat exchange medium, displacing heat from the outside world, thereby rapidly cooling the screw vacuum pump's internal components.

[0013] Compared with the existing technology, the connection structure of the screw vacuum pump has the following advantages:

[0014] A plurality of welding openings are provided on the outer wall of the pump casing, which are spaced apart along the length direction of the installation channel and connected to the installation channel, and the plurality of welding openings and the plurality of retaining ribs are staggered along the length direction of the installation channel. During assembly, the bushing and the retaining ribs in the welding openings can be welded to the abutment points, thereby improving the installation firmness of the bushing. At the same time, sealing plates for sealing the welding openings are welded on the pump casing to ensure that the internal welding is completely isolated from the outside world to prevent it from being subjected to oxidation corrosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the connection structure of the screw vacuum pump.

[0016] Figure 2 This is an exploded view and a partial enlarged view of the connection structure of this screw vacuum pump.

[0017] Figure 3 It is a cross-sectional view and a partial enlarged view of the connection structure of the screw vacuum pump.

[0018] In the figure, 1, bushing; 2, pump housing; 21, installation channel; 211, retaining rib; 22, welding port; 23, limiting groove; 24, cooling chamber; 3, sealing plate. DETAILED DESCRIPTION

[0019] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0020] like Figure 1-3 As shown, in the connection structure of the screw vacuum pump, the screw vacuum pump includes a pump casing 2 and a bushing 1. The pump casing 2 is long and horizontally placed. It is specifically cast by cast steel material. The bushing 1 is rolled by stainless steel plate. The interior of the pump casing 2 is provided with a mounting channel 21 running through both ends thereof along the length direction. The bushing 1 is inserted into the mounting channel 21. A number of retaining ribs 211 are provided around the bushing 1 in the pump casing 2 and abut against the outer peripheral wall of the bushing 1, and the number of retaining ribs 211 are spaced apart along the length direction of the mounting channel 21.

[0021] like Figure 1-3As shown, the connection structure includes a plurality of welding openings 22 opened on the outer walls on both sides of the pump casing 2 and connected to the installation channel 21. The plurality of welding openings 22 opened on both sides of the pump casing 2 are spaced apart along the length direction of the pump casing 2 and are positioned one by one opposite to each other. The plurality of welding openings 22 opened on both sides of the pump casing 2 and the plurality of retaining ribs 211 in the pump casing 2 are staggered along the length direction of the installation channel 21.

[0022] like Figure 1-3 As shown, a plurality of limiting grooves 23 are provided on the outer walls on both sides of the pump housing 2, and the plurality of limiting grooves 23 are arranged one by one around the plurality of welding ports 22. The connection structure further comprises a plurality of sealing plates 3. Each welding port 22, each limiting groove 23 and each sealing plate 3 are square in shape, and the circumferential corners of each limiting groove 23 and each sealing plate 3 are arc-shaped transitions, as shown in FIG. Figure 3 As shown, a plurality of cooling cavities 24 arranged around the bushing 1 are formed outside the bushing 1 in the pump housing 2 , and the plurality of cooling cavities 24 and the plurality of retaining ribs 211 are alternately arranged along the length direction of the installation channel 21 .

[0023] Assembly principle: A worker inserts the bushing 1 into the installation channel 21 and abuts it against the outer wall of the bushing 1 through each retaining rib 211 to achieve pre-installed stability of the bushing 1, and then uses a welding gun to weld the two ends of the bushing 1 to the inner walls of the two ends of the installation channel 21 to position the two ends of the bushing 1, and then passes the welding gun through each welding port 22 in turn and performs secondary welding on the abutment points of the bushing 1 and each retaining rib 211, and then embeds each sealing plate 3 in the limiting groove 23 in turn, and welds the plate edge of the sealing plate 3 to the groove wall of the limiting groove 23, so that the sealing plate 3 covers the welding port 22.

[0024] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

[0025] Although this document frequently uses terms such as bushing 1, pump housing 2, mounting channel 21, retaining rib 211, welding opening 22, retaining groove 23, cooling chamber 24, and sealing plate 3, the use of other terms is not excluded. These terms are used solely to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.

Claims

1. A connection structure of a screw vacuum pump, comprising a sleeve (1) and a pump housing (2) with an installation channel (21) provided therein, wherein the sleeve (1) is inserted into the installation channel (21), and the installation channel (21) is provided with a plurality of retaining ribs (211) abutting against the outer wall of the sleeve (1) along the circumferential direction, and the plurality of retaining ribs (211) are spaced apart along the length direction of the installation channel (21), characterized in that: The connection structure comprises a plurality of sealing plates (3) and a plurality of welding ports (22) provided on the outer side wall of the pump housing (2) and arranged at intervals, each of the welding ports (22) being in communication with the installation channel (21), the plurality of welding ports (22) and the plurality of retaining ribs (211) being staggered along the length direction of the installation channel (21), and the plurality of sealing plates (3) being welded and fixed to the pump housing (2) and covering the plurality of welding ports (22).

2. The connection structure of the screw vacuum pump according to claim 1, characterized in that: A plurality of annular limiting grooves (23) are provided on the outer wall of the pump housing (2), and the plurality of limiting grooves (23) are arranged one-to-one around the plurality of welding ports (22). The sealing plate (3) is embedded in the limiting grooves (23) and is fixed to the inner wall of the limiting grooves (23) by welding.

3. The connection structure of the screw vacuum pump according to claim 1 or 2, characterized in that: A plurality of welding openings (22) are provided on the outer wall of the pump housing (2) on both sides of the installation channel (21), and the plurality of welding openings (22) on one side are positioned opposite to the plurality of welding openings (22) on the other side.

4. The connection structure of the screw vacuum pump according to claim 2, characterized in that: Each of the welding ports (22), each of the limiting grooves (23) and each of the sealing plates (3) is in the form of a quadrilateral, and the circumferential corners of each of the limiting grooves (23) are in the form of an arc transition.

5. The connection structure of the screw vacuum pump according to claim 3, characterized in that: The pump housing (2) has a plurality of cooling cavities (24) arranged around the bushing (1), and the plurality of cooling cavities (24) and the plurality of retaining ribs (211) are alternately arranged one by one along the length direction of the installation channel (21).

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