Sanitary rotor pump sealing device

Abstract

The utility model discloses a sanitary rotor pump sealing device which comprises a pump head and a pump body, a rotor part is arranged in the pump head, a transmission shaft is arranged in the pump body, one end of the transmission shaft is used for being installed with the rotor part in a matched mode, a sealing assembly is arranged on the transmission shaft, and the sealing assembly is located at the joint of the pump head and the pump body. The sealing assembly comprises an oil seal seat, a sealing cavity is formed between the oil seal seat and a shaft sleeve arranged on the transmission shaft in a sleeving mode, two oil seals are arranged in the sealing cavity side by side, and a space ring is arranged between the two oil seals. According to the sealing device, through the design of the two PTFE stainless steel double-lip seals which are arranged in parallel, the sealing performance can be remarkably improved, the service life of the sealing device can be remarkably prolonged, and when one lip-shaped sealing ring loses efficacy due to dry grinding and impurities, the other lip-shaped sealing ring can still play a sealing role.

Description

Technical Field

[0001] This utility model belongs to the field of rotor pump sealing technology, specifically relating to a sanitary rotor pump sealing device. Background Technology

[0002] Rotary pumps select different sealing methods based on the medium being pumped. Generally, packing seals are used for media with high viscosity that solidify at low temperatures, while mechanical seals are used for others. The packing seal device of a rotary pump is installed in the cavity where the shaft extends out of the pump body. It includes a shaft mounted on the pump body, a bushing fitted onto the shaft, a sealing seat fixed to the pump body end face, a gland, and multiple packing rings sequentially fitted onto the bushing. This type of rotary pump packing seal device has the following disadvantages: After the pumped medium flows in through the inlet, it passes through the low-pressure zone of the cavity housing the two rotors in the pump body, then through the action of the two rotors to the high-pressure zone, and finally flows out from the outlet. However, some of the pumped medium still flows into the packing rings through the gap between the pump body shaft hole wall and the outer wall of the bushing. Although the packing rings provide a seal, they cannot completely seal the area, and a small amount of medium can still seep in. With long-term use, this can easily lead to excessive local accumulation, affecting the sealing effect and interfering with the shaft rotation, thus affecting product use. Utility Model Content

[0003] To overcome the shortcomings of existing technologies, this utility model provides a sanitary rotary pump sealing device that solves the sealing problem of the rotary pump through a design of two parallel PTFE stainless steel double-lip seals. The specific technical solution of this utility model is as follows:

[0004] A sanitary rotary pump sealing device includes a pump head and a pump body. The pump head contains a rotor component, and the pump body contains a drive shaft. One end of the drive shaft is used to mate with the rotor component. A sealing assembly is provided on the drive shaft. The sealing assembly is located at the junction of the pump head and the pump body. The sealing assembly includes an oil seal seat. A sealing cavity is provided between the oil seal seat and a bushing fitted on the drive shaft. Two oil seals are arranged side by side in the sealing cavity, and a spacer is provided between the two oil seals.

[0005] Furthermore, the oil seal is a double-lip oil seal, including an oil seal ring and two lip-shaped sealing rings arranged side by side in the inner ring of the oil seal ring. The outer ring wall of the oil seal ring abuts against the oil seal seat, and the arc-shaped portion of the lip-shaped sealing ring abuts against the bushing.

[0006] Furthermore, the lip seal is made of PTFE.

[0007] Furthermore, a pump chamber is provided inside the pump head, and the pump chamber forms a sealed area for the movement of the rotor components through a pump cover provided on one side. An inlet and an outlet are provided through the pump head.

[0008] Furthermore, a ball valve is provided on the pump cover, which communicates with the pump chamber to control the internal pressure of the pump chamber.

[0009] Furthermore, the transmission shaft includes a main shaft and a secondary shaft, and the rotor component includes a first rotor and a second rotor that cooperate with the main shaft and the secondary shaft, wherein the first rotor and the second rotor are three-lobe rotors.

[0010] Furthermore, mounting components are provided on all four sides of the outer wall of the pump body.

[0011] Furthermore, the mounting assembly is a flange assembly or a threaded assembly.

[0012] Furthermore, the rotor pump includes a detachably assembled pump head, pump body, and rear cover.

[0013] Compared with the prior art, the present invention has the following advantages:

[0014] (1) The sealing device of this application has a design of two parallel PTFE stainless steel double-lip seals, which can significantly enhance the sealing performance and life. When one lip seal fails due to dry friction and impurities, the other can still play a sealing role.

[0015] (2) Compared with traditional oil seals, PTFE double-lip oil seals have better corrosion resistance (PTFE has excellent chemical inertness and can resist the erosion of almost all strong acids, strong alkalis and organic solvents, and is suitable for handling various corrosive media), high pressure resistance, high temperature resistance, and the material itself has certain self-lubricating properties and low friction coefficient.

[0016] (3) The pump body of this application is equipped with installation components on all four sides of the outer wall, which allows the screw pump to be installed from four directions. The direction of the inlet and outlet can be flexibly adjusted according to the actual site conditions, reducing the need for complex pipeline conversion. Users can quickly change the inlet and outlet connection form of the pump (such as flange connection, threaded connection, etc.) according to actual needs without replacing the entire pump body, which can adapt to different application scenarios.

[0017] (4) This application adopts a three-section design, which facilitates disassembly and cleaning of the inside of the rotor pump, and is conducive to the hygiene of the inside of the rotor pump. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the rotor pump structure of this utility model;

[0019] Figure 2 This is a top view of the rotor pump of this utility model;

[0020] Figure 3 This utility model Figure 2 Sectional view of AA;

[0021] Figure 4 This is a schematic diagram of the sealing device of this utility model;

[0022] Figure 5 This utility model Figure 4 BB section view;

[0023] Figure 6 This is a schematic diagram of the structure of the oil seal of this utility model.

[0024] In the diagram: 1-Pump head, 2-Pump body, 3-Rotor component, 4-Drive shaft, 5-Oil seal seat, 6-Shaft sleeve, 7-Oil seal, 71-Oil seal ring, 72-Lip seal ring, 8-Spacer ring, 9-Pump cover, 10-Ball valve, 11-Rear cover, 12-Flange, 13-Sealing ring. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0026] The application environment of the rotor pump sealing device in this application includes environments where the seal is dry-running due to prolonged material interruption and harsh external operating conditions.

[0027] like Figures 1-3 As shown, a sanitary rotary pump sealing device includes a pump head 1 and a pump body 2. The pump head 1 is provided with a rotor 3, and the pump body 2 is provided with a drive shaft 4. One end of the drive shaft 4 is used to mate with the rotor 3. A sealing assembly is provided on the drive shaft 4. The sealing assembly is located at the junction of the pump head 1 and the pump body 2. The sealing assembly includes an oil seal seat 5. A sealing cavity is provided between the oil seal seat 5 and the bushing 6 sleeved on the drive shaft 4. Two oil seals 7 are arranged side by side in the sealing cavity, and a spacer 8 is provided between the two oil seals 7.

[0028] This application uses two parallel oil seals 7. When one oil seal 7 fails due to dry friction or impurities, the other can still provide a seal, significantly enhancing the sealing performance and lifespan. To further ensure sealing, a sealing ring 13 is provided between the oil seal seat 5 and the pump head 1.

[0029] like Figures 4-6 As shown, oil seal 7 is a double-lip oil seal, comprising an oil seal ring 71 and two parallel lip seal rings 72 arranged within the inner ring of the oil seal ring 71. The outer ring wall of the oil seal ring 71 abuts against the oil seal seat 5, and the arc-shaped portion of the lip seal ring 72 abuts against the bushing 6. The lip seal ring 72 is made of PTFE sheet. Compared with traditional oil seals, PTFE double-lip oil seals have better corrosion resistance, high pressure resistance, high temperature resistance, and the material itself has certain self-lubricating properties and a low coefficient of friction.

[0030] Continue reading Figures 1-3 As can be seen, the rotary pump includes a detachable pump head 1, a pump body 2, and a rear cover 11. The pump head 1 has a pump chamber, which is sealed by a pump cover 9 on one side, forming a movable sealing area for the rotor component 3. The pump head 1 has an inlet and an outlet. A ball valve 10 is installed on the pump cover 9, communicating with the pump chamber to control the internal pressure. Mounting assemblies are installed on all four sides of the outer wall of the pump body 2; these assemblies can be flange assemblies or threaded assemblies. At least one side of the outer wall of the pump body 2 has a flange assembly. The design of the mounting assemblies on the outer wall of the pump body 2 allows for installation or connection from four directions, and the inlet and outlet directions can be flexibly adjusted according to actual site conditions, reducing the need for complex pipeline conversions. In a specific embodiment, the flange assembly can be designed as a flange bracket 12. The threaded assembly can be designed as a threaded hole that mates with bolts, facilitating the installation and fixing of the rotary pump.

[0031] In addition, the transmission shaft 4 includes a main shaft and a secondary shaft, and the rotor component 3 includes a first rotor and a second rotor that cooperate with the main shaft and the secondary shaft. The first rotor and the second rotor are three-lobe rotors.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A sanitary rotary pump sealing device, comprising a pump head (1) and a pump body (2), wherein a rotor component (3) is disposed within the pump head (1), and a drive shaft (4) is disposed within the pump body (2), one end of the drive shaft (4) being used for mating with the rotor component (3), characterized in that, A sealing assembly is provided on the drive shaft (4). The sealing assembly is located at the connection between the pump head (1) and the pump body (2). The sealing assembly includes an oil seal seat (5). A sealing cavity is provided between the oil seal seat (5) and the bushing (6) sleeved on the drive shaft (4). Two oil seals (7) are arranged side by side in the sealing cavity, and a spacer (8) is provided between the two oil seals (7).

2. The sanitary rotor pump sealing device according to claim 1, characterized in that, The oil seal (7) is a double-lip oil seal, including an oil seal ring (71) and two lip seals (72) arranged side by side in the inner ring of the oil seal ring (71). The outer ring wall of the oil seal ring (71) abuts against the oil seal seat (5), and the arc-shaped part of the lip seal (72) abuts against the bushing (6).

3. The sanitary rotor pump sealing device according to claim 2, characterized in that, The lip seal (72) is a PTFE sheet.

4. The sanitary rotor pump sealing device according to claim 1, characterized in that, The pump head (1) is provided with a pump chamber, which is formed by a pump cover (9) on one side to form a sealed area for the rotor (3) to move. The pump head (1) is provided with an inlet and an outlet.

5. A sanitary rotor pump sealing device according to claim 4, characterized in that, A ball valve (10) is provided on the pump cover (9) and communicates with the pump chamber to control the internal pressure of the pump chamber.

6. A sanitary rotor pump sealing device according to any one of claims 1-5, characterized in that, The transmission shaft (4) includes a main shaft and a secondary shaft, and the rotor component (3) includes a first rotor and a second rotor that cooperate with the main shaft and the secondary shaft. The first rotor and the second rotor are three-lobe rotors.

7. A sanitary rotor pump sealing device according to any one of claims 1-5, characterized in that, The pump body (2) has mounting components installed on all four sides of its outer wall.

8. A sanitary rotor pump sealing device according to claim 7, characterized in that, The mounting assembly is a flange assembly or a threaded assembly.

9. A sanitary rotor pump sealing device according to any one of claims 1-5, characterized in that, The rotor pump includes a detachably assembled pump head (1), a pump body (2), and a rear cover (11).

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