CN204476840U - Metal horizontal centrifugal pump - Google Patents

Abstract

A metal horizontal centrifugal pump, including a pump body, an impeller, a cylindrical pump cover, a mechanical seal mechanism arranged in the middle cavity of the pump cover, a mechanical seal gland connected to the rear end of the pump cover, and a mechanical seal gland connected to the pump body The outer gland at the rear opening of the pump and the pump shaft connected to the impeller. The mechanical seal mechanism includes a sleeve, spring, pressure ring, mechanical seal static ring, mechanical seal dynamic ring and dynamic ring seat. The sleeve is fixedly connected to the pump cover. In the middle cavity of the sleeve, the spring, the pressure ring and the static ring of the machine seal are arranged in the middle cavity of the sleeve in sequence from back to front. The spring is sleeved on the pump shaft. The ring and the static ring of the mechanical seal are both sleeved on the shaft sleeve of the pump shaft. The moving ring seat is set at the front end of the pump shaft. Sleeved on the shaft sleeve of the pump shaft, the moving ring of the mechanical seal and the static ring of the mechanical seal cooperate with each other in a sealed manner. The utility model has better sealing performance and good corrosion resistance, can be applied to corrosive fluid working conditions, and has a longer service life.

Description

Metal Horizontal Centrifugal Pump

technical field

The utility model relates to the technical field of centrifugal pumps, in particular to a metal horizontal centrifugal pump.

Background technique

The centrifugal pump is designed according to the principle of centrifugal force, and it usually includes an impeller, a pump body, a pump shaft, a bearing, a sealing ring and a stuffing box. Before starting the pump, the pump body and the suction line are filled with medium liquid. When working, the centrifugal pump is driven by the motor, and the high-speed rotating impeller blades drive the medium to rotate, and the medium is thrown from the center of the impeller to the outer edge of the impeller by centrifugal force, and discharged through the discharge port of the pump body, so as to achieve the purpose of transportation. There are many kinds of centrifugal pumps, which can be divided into horizontal centrifugal pumps and vertical offline pumps according to the direction of the pump shaft.

However, the mechanical seal structure of the centrifugal pump in the prior art is not reasonable enough, especially in the occasions of corrosive fluids such as petroleum, chemical industry, steel, papermaking, environmental protection, etc., the cemented carbide sealing surface of the metal centrifugal pump cannot meet the requirements of the working conditions. There is an urgent need in the technology for a metal horizontal centrifugal pump with better sealing performance, good corrosion resistance, applicable to corrosive fluid conditions, and longer service life.

Contents of the invention

The purpose of the utility model is to overcome the shortcomings of the prior art and provide a metal horizontal centrifugal pump with better sealing performance, good corrosion resistance, applicable to corrosive fluid working conditions and longer service life.

The utility model is achieved through the following technical solutions: a metal horizontal centrifugal pump, comprising a pump body, an impeller arranged in the first half of the cavity in the middle of the pump body, and an impeller arranged in the second half of the cavity in the middle of the pump body The cylindrical pump cover, the mechanical seal mechanism arranged in the middle cavity of the pump cover, the mechanical seal gland connected to the rear end of the pump cover by bolts, and the outer casing connected to the rear opening of the pump body by bolts The gland and the pump shaft passing through the gland of the mechanical seal and the pump cover and connected to the impeller forward, the mechanical seal mechanism includes a sleeve, a spring, a pressure ring, a stationary ring of the mechanical seal, a dynamic ring of the mechanical seal and a dynamic ring seat , the sleeve is fixedly connected in the middle cavity of the pump cover, the spring, the pressure ring, and the mechanical seal static ring are sequentially arranged in the middle cavity of the sleeve from back to front, The spring is sleeved on the pump shaft, the rear end of the spring is against the gland of the machine seal, the front end of the spring is against the pressure ring, the pressure ring, the static ring of the machine seal They are all sleeved on the shaft sleeve of the pump shaft, the moving ring seat is arranged at the front end of the pump shaft, the moving ring of the mechanical seal is arranged in the cavity opened to the rear of the moving ring seat, and the moving ring of the mechanical sealing Sleeved on the shaft sleeve of the pump shaft, the rear end surface of the mechanical seal dynamic ring and the front end surface of the mechanical seal static ring contact each other and seal fit.

The mechanical seal static ring is a pressureless sintered silicon carbide mechanical seal static ring, and the mechanical seal dynamic ring is a pressureless sintered silicon carbide mechanical seal dynamic ring.

An annular groove is formed between the pump cover and the mechanical seal gland at the rear end periphery of the cavity in the middle of the pump cover, and an annular edge is provided at the rear end of the sleeve, and the annular edge is pressed against the In the annular groove between the pump cover and the mechanical seal gland.

The outer circumference of the pump cover is provided with an annular flange, the periphery of the rear opening of the pump body is provided with an annular groove extending inward from the rear end of the pump body, and the front end of the outer gland is provided with an annular pressure ring. tight edge, the annular convex edge of the pump cover is pressed between the annular groove and the annular pressing edge.

It also includes a bearing frame, and the outer gland is integrally formed on the front end of the bearing frame.

The bearing frame is provided with a bearing chamber extending inward from the front end, and the bearing housing is also provided with a bearing chamber extending inward from the rear end. The first bearing and the second bearing are respectively arranged in the two bearing chambers. The front end of the bearing housing The front surface and the rear end surface are respectively covered with a bearing front cover and a bearing rear cover. The middle section of the pump shaft is penetrated in the bearing box, and the first oil seal and the second oil seal are respectively arranged between the two bearing covers and the pump shaft. oil seal.

The beneficial effects of the utility model are: the mechanical seal structure of the utility model is more reasonable, it is easy to install, has better sealing performance, has good corrosion resistance, can be applied to corrosive fluid working conditions, and can overcome common metal centrifugal seals at the same time. Pump defects, guaranteed life.

Description of drawings

Fig. 1 is the sectional structural representation of the utility model;

FIG. 2 is an enlarged structural schematic diagram of part A of FIG. 1 .

In the figure: 1-pump body; 2-impeller nut; 3-impeller; 4-pump cover; 5-mechanical seal mechanism; 6-machine seal gland; 7-water retaining ring; 8-bearing front cover; -First oil seal; 10-first bearing; 11-bearing frame; 12-pump shaft; 13-second oil seal; 14-second bearing; 15-bearing back cover; 16-spring; 17-sleeve; 18- Pressure ring; 19-shaft sleeve; 20-static ring of machine seal; 21-moving ring of machine seal; 22-moving ring seat.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in detail.

As shown in Figure 1 and Figure 2, a metal horizontal centrifugal pump includes a pump body 1, an impeller 3 arranged in the first half of the middle cavity of the pump body 1, and a second half of the middle cavity of the pump body 1 The cylindrical pump cover 4 in the part, the mechanical seal mechanism 5 arranged in the middle cavity of the pump cover 4, the mechanical seal gland 6 connected to the rear end of the pump cover 4 by bolts, and the mechanical seal gland 6 connected to the pump body 1 by bolts The outer gland at the opening of the rear end and the pump shaft 12 that passes through the mechanical seal gland 6 and the pump cover 4 and is connected to the impeller 3 forward. The mechanical seal mechanism 5 includes a sleeve 17, a spring 16, a pressure ring 18, a static Ring 20, mechanical seal moving ring 21 and moving ring seat 22, sleeve 17 are fixedly connected in the middle cavity of pump cover 4, spring 16, pressure ring 18, and mechanical seal static ring 20 are arranged on the sleeve sequentially from back to front In the middle cavity of 17, the spring 16 is sleeved on the pump shaft 12, the rear end of the spring 16 abuts against the machine seal gland 6, the front end of the spring 16 abuts against the press ring 18, the press ring 18 and the machine seal static ring 20 Sleeved on the shaft sleeve 19 of the pump shaft 12, the moving ring seat 22 is arranged on the front end of the pump shaft 12, and the mechanical seal moving ring 21 is arranged in the cavity opened to the rear of the moving ring seat 22. The mechanical seal moving ring 21 Sleeved on the shaft sleeve 19 of the pump shaft 12 , the rear end surface of the mechanical seal dynamic ring 21 and the front end surface of the mechanical seal static ring 20 are in contact with each other and sealed.

The mechanical seal static ring 20 is a pressureless sintered silicon carbide mechanical seal static ring 20, and the mechanical seal dynamic ring 21 is a pressureless sintered silicon carbide mechanical seal dynamic ring 21. The pressureless sintered silicon carbide is more wear-resistant and corrosion-resistant. The utility model meets the use requirements of various harsh working conditions.

Between the pump cover 4 and the mechanical seal gland 6, an annular groove is formed on the periphery of the rear end of the middle cavity of the pump cover 4, and the rear end of the sleeve 17 is provided with an annular edge, which is pressed against the pump cover. 4 and the ring groove between the mechanical seal gland 6.

The outer circumference of the pump cover 4 is provided with an annular convex edge, the periphery of the rear end opening of the pump body 1 is provided with an annular groove extending inwardly from the rear end of the pump body 1, and the front end of the outer gland is provided with an annular pressing edge. The annular convex edge of the pump cover 4 is pressed between the annular groove and the annular pressing edge, and the pump cover 4 is fixed by this matching method, making the installation more convenient.

The utility model also includes a bearing frame 11, and the outer gland is integrally formed on the front end of the bearing frame 11. The structure is more stable and can effectively ensure the connection reliability and sealing performance of the equipment.

The bearing frame 11 is provided with a bearing chamber extending inwardly from the front end, and the bearing box is also provided with a bearing chamber extending inwardly from the rear end. The first bearing 10 and the second bearing 14 are respectively arranged in the two bearing chambers. The front end surface and the rear end surface are respectively covered with a bearing front cover 8 and a bearing rear cover 15, the middle section of the pump shaft 12 is installed in the bearing box, and the first oil seal 9 and the pump shaft 12 are respectively provided between the two bearing covers and the The second oil seal 13. The pump shaft 12 is sleeved with a water retaining ring 7 between the bearing front cover 8 and the machine seal gland 6 .

When installing, first install the pump cover 4, mechanical seal gland 6, and mechanical seal mechanism 5, then install the impeller 3 to the front end of the pump shaft 12 through the impeller nut 2, and tighten the impeller nut 2 at the same time, press the mechanical seal Mechanism 5 keeps the mechanical seal in working condition and plays a sealing role. Finally, put the installed impeller 3, pump cover 4, mechanical seal gland 6, and mechanical seal mechanism 5 into the middle cavity of the pump body 1, and connect Outer gland. The utility model has the advantage of being easy to install. When working, the spring 16 can better control the compression of the mechanical seal, thereby improving the performance of the mechanical seal.

Finally, it should be noted that the above content is only used to illustrate the technical solution of the utility model, rather than to limit the scope of protection of the utility model. Simple modifications or equivalent replacements to the technical solution of the utility model by those skilled in the art are all acceptable. Do not depart from the essence and scope of the technical solution of the utility model.

Claims (6)

1. A metal horizontal centrifugal pump, characterized in that: the metal horizontal centrifugal pump comprises a pump body, an impeller arranged in the first half of the cavity in the middle of the pump body, and a second half of the cavity in the middle of the pump body The cylindrical pump cover in the part, the mechanical seal mechanism arranged in the middle cavity of the pump cover, the mechanical seal gland connected to the rear end of the pump cover by bolts, and the rear end opening of the pump body connected by bolts The outer gland of the mechanical seal and the pump shaft connected to the impeller forward through the mechanical seal gland and the pump cover. The mechanical seal mechanism includes a sleeve, a spring, a pressure ring, a static ring of the mechanical seal, a dynamic ring of the mechanical seal and a dynamic Ring seat, the sleeve is fixedly connected in the middle cavity of the pump cover, the spring, the pressure ring, and the mechanical seal static ring are sequentially arranged in the middle cavity of the sleeve from back to front Inside, the spring is sleeved on the pump shaft, the rear end of the spring is against the gland of the machine seal, the front end of the spring is against the pressure ring, the pressure ring, the machine seal The static rings are all sleeved on the shaft sleeve of the pump shaft, the moving ring seat is arranged at the front end of the pump shaft, and the moving ring of the mechanical seal is arranged in the cavity opened to the rear of the moving ring seat. The moving ring is sheathed on the shaft sleeve of the pump shaft, and the rear end surface of the moving ring of the mechanical seal is in contact with the front end surface of the static ring of the mechanical seal for sealing fit. 2. The metal horizontal centrifugal pump according to claim 1, characterized in that: the static ring of the mechanical seal is a static ring of a pressureless sintered silicon carbide mechanical seal, and the moving ring of the mechanical seal is a pressureless sintered silicon carbide mechanical seal moving ring. 3. The metal horizontal centrifugal pump according to claim 1 or 2, characterized in that an annular groove is formed between the pump cover and the mechanical seal gland at the rear end periphery of the cavity in the middle of the pump cover , the rear end of the sleeve is provided with an annular edge, and the annular edge is pressed into the annular groove between the pump cover and the mechanical seal gland. 4. The metal horizontal centrifugal pump according to claim 1 or 2, characterized in that: the outer circumference of the pump cover is provided with an annular convex edge, and the periphery of the rear end opening of the pump body is provided with a The rear end of the pump cover faces the inwardly extending annular groove, and the front end of the outer gland is provided with an annular pressing edge, and the annular convex edge of the pump cover is pressed between the annular groove and the annular pressing edge. 5 . The metal horizontal centrifugal pump according to claim 4 , further comprising a bearing frame, and the outer gland is integrally formed on the front end of the bearing frame. 6. The metal horizontal centrifugal pump according to claim 5, characterized in that: the bearing frame is provided with a bearing chamber extending inward from the front end, and the bearing housing is also provided with a bearing chamber extending inward from the rear end. Each of the bearing chambers is provided with a first bearing and a second bearing, the front end surface and the rear end surface of the bearing housing are respectively covered with a bearing front cover and a bearing rear cover, and the middle section of the pump shaft is installed in the bearing housing. A first oil seal and a second oil seal are respectively arranged between each bearing cover and the pump shaft.