JPS6257839B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a pump, particularly for use in a water type factory.

[Prior Art] Conventionally, pumps have been used to transport chemicals in chemical factories, pulp factories, sake brewing factories, etc., but the main parts of these pumps must be made of materials that can withstand the above chemicals. It is also necessary to prevent chemicals, alcohol, etc. from leaking from the shaft seal of the rotating shaft, resulting in loss of chemical solutions and the risk of corroding the bearings and rotating shafts due to these chemicals. Ta.

Furthermore, this type of pump generally has an impeller at the tip of the rotating shaft, followed by a mechanical seal or gland packing part, and then a bearing box, but for maintenance and repair purposes, I had to take these parts apart.

Conventionally, when disassembling parts fitted onto a rotating shaft, liquid often enters between the rotating shaft and each part, resulting in a rusted state, making disassembly difficult.

Next, if the distance between the front and rear bearings in the bearing box is not appropriate, there is a risk of vibration at the tip of the rotating shaft, which will cause major problems with the pump. Although the distance is determined to be an appropriate length, it is particularly preferable that the front bearing be as close as possible to the sliding surface of the mechanical seal or the impeller.

Also, when applying pressure fluid to a mechanical seal, if it is water, tap water is often used and thrown away after use; if it is a special liquid, a pressure device is installed in addition to the pump device. However, there are many configurations that prevent the transferred liquid from leaking from the mechanical seal.
In addition, the temperature of these pressure fluids rose during the rotation of the pump, and the temperature of the fluids was lowered by passing the pipes introducing the pressure fluids through a heat exchanger.Installing these devices This has the disadvantage that the overall size of the device increases.

[Problems to be solved by the invention] The present invention has been developed in view of the above matters.
By creating a structure that allows pressure fluid to easily enter between the parts fitted to the rotating shaft and the rotating shaft, disassembly can be easily performed, and maintenance and repair can also be performed easily. A simple pressure generating part is formed in the bearing box, which was a vacant space until now, and when the pump is rotating, pressure fluid is applied to the mechanical seal part by the rotational force, and when the pump is stopped, the pressure fluid is created inside the bearing box. In order to apply pressure to the fluid using a pressure adjustment spring installed in the pump, the pump is configured so that the pressure fluid is working on the mechanical seal part in any state, and to prevent the temperature of the pressure fluid from rising. Pressure fluid is circulated within a bearing box and a tank provided outside the box, a fan is provided on a rotating shaft, and the fan is rotated by rotation of the rotating shaft to cool the bearing box and tank. To provide a pump which has a structure that prevents a rise in the temperature of pressure fluid, and which has a structure in which only a tank is attached other than the pump device, and which has a compact overall structure and is easy to manage and repair. The purpose is to

[Means for solving problems] Next, the configuration of the present invention will be explained.

During operation, pressure is applied to the fluid in the bearing box of the rotary shaft by a screw pump consisting of a screw section provided on the rotary shaft and a correspondingly acting piston section, and when the machine is stopped, pressure is applied to the fluid in the bearing box of the rotary shaft. The structure is such that pressure can be applied by a pressure adjustment spring, the fluid can be circulated within the bearing box and a tank provided outside the mantle, and the rear end of the rotating shaft A fan is installed to cool these fluids, and an oil seal is interposed between the front inner circumferential surface of the slidably installed piston portion and a tapered sleeve provided on the rotating shaft, and the oil seal The axial sleeve provided in the mechanical seal portion is provided with a diametrical passage and an oil sump cavity communicating with the diametrical passage.

[Function] The present invention has the above-described configuration, and when used, it is used in the same way as conventional pumps. However, while the pump of the present invention is in operation, the screw pump formed in the bearing box is Therefore, pressure is applied to the fluid in the bearing box, and the pressure fluid can be applied to the mechanical seal.Also, when the pump is stopped, the piston is biased by the pressure adjustment spring, and the pressure fluid is applied to the mechanical seal. It can be applied to mechanical seals.

In addition, an oil sump space is formed in the shaft sleeve provided on the rotating shaft, making it easy to disassemble and maintain and repair.Furthermore, by installing a fan at the rear end of the rotating shaft, This can prevent the temperature of the pressure fluid from rising.

[Example] Next, an example of the present invention will be described based on the drawings.

It consists of three parts: a pump casing 3 with an impeller 2 installed at the tip of the rotating shaft 1, a mechanical seal part 4, and then a bearing box 5, and the rear end is a motor (not shown). It is directly connected to, or connected by a belt or the like.

In the pump casing 3, the impeller 2,
A nut 6 for screwing the impeller 2 onto the rotating shaft 1
The inner casing 7 and the like are made of a material that is not corroded by the transferred liquid, and a lid is provided at the rear of the pump casing 3 so that the impeller 2 can be inserted into the rotating shaft 1 with the nut 6. 8, and then in the mechanical seal part 4,
The mechanical seal 10 is installed between the shaft sleeve 11 fitted onto the rotating shaft 1 and the lid 8 and presser cover 45 of the pump casing 3, and extends to the peripheral wall of the shaft sleeve 11 and the inner peripheral surface of the shaft sleeve 11. A small passage 12 is provided, and an oil sump cavity 13 is provided on the inner peripheral surface of the shaft sleeve 11 that communicates with the passage 12. A screw part 16 is set on the rotating shaft 1, and a piston part 17 has an inner diameter into which the screw part 16 can be fitted.
is fitted to the outside of the screw portion 16 and is also inserted so as to closely fit and slide smoothly on the inner circumferential surface of the outer sleeve 18 of the bearing box 5, and the pump of the piston portion 17 The casing side, that is, the space between the front surface of the piston part 17 and the rear face of the pump casing 3 is defined as a high pressure chamber 20 in which high pressure fluid is applied to the mechanical seal part 4.
Large and small through holes 21 and 22 are provided in the front wall 19 of 8,
A bearing 14 is fitted between the inner circumferential surface of the front wall 19 and the rotating shaft 1, and a fluid passage 25 having a check valve 24 extending from the inner circumferential surface of the piston portion 17 to the front surface of the piston portion 17 is provided. A pipe 26 is screwed into the opening of the fluid passage 25 on the front surface of the portion 17, and the pipe 26 is inserted into the larger through hole 21 provided in the front wall 19 of the mantle 18, and the opening A pressure regulating groove 27 is formed in the front of the outer peripheral surface of the piston part 17, and an O-ring 28 is fitted in the rear part of the groove 27, so that the pressure regulating groove 27 and the piston part 17 are positioned in the high pressure chamber 20. An axial fluid passage 30 is provided on the outer peripheral surface between the front surface and a tapered sleeve 31 on the rotating shaft 1 between the bearing 14 and the screw portion 16.
an oil seal 32 that closely fits into the large diameter portion of the sleeve 31 is attached to the inner periphery of the front surface of the piston portion 17, a bearing case 33 is attached to the rear of the outer sleeve 18, and the case A pressure regulating spring 3 is provided between the front surface of the pressure regulating spring 33 and the piston portion 17.
4 is interposed, this space is used as a low pressure chamber 35, a rear bearing 15 is fitted between the inner peripheral surface of the bearing case 33 and the rotating shaft 1, and a bearing cover 38 is attached to the rear surface of the bearing case 33. Between the mantle tube 18 and the tank 39 provided outside the mantle tube 18, one is the tank 39.
9 and the low pressure chamber 35, and the other one is a communication path 41 that introduces fluid from the high pressure chamber 20 into the tank 39, and the opening of the communication path 41 on the side of the mantle 18 is provided. The position of the part is such that when the piston part 17 is in the forward position, it can communicate with the pressure regulating groove 27 provided in front of the O-ring 28 of the piston part 17,
A fluid relief groove 42 is provided on the inner peripheral surface of the mantle 18 that matches the opening, and a fan 43 is provided at the rear end of the rotating shaft 1.
The tank 39, the low pressure chamber 35, and the high pressure chamber 20 are filled with fluid.

In the figure, 44 is a pressure gauge, 45 is a fixed ring presser on the lid part 8, 46 is a contact part of the piston part 17 at the forward stop position, 49 is a guide for the pressure adjustment spring 34, and 5 is a pressure gauge.
0 is a pulley.

The fluid is preferably a liquid, especially an oil such as fluid paraffin, which lubricates the rotating contact surface of the mechanical seal, prevents leakage, acts as an anti-corrosion agent, and cools the mechanical seal by removing frictional heat.

The present invention has the above configuration, and when there is no pressure in the high pressure chamber 20, the piston part 17 moves forward by the force of the pressure adjustment spring 34 and is in contact with the contact part 46 (see drawing). In this state, when the pump is started, the screw part 16 and the piston part 17
The fluid is transferred forward from the low pressure chamber 35 due to the action of High-pressure fluid is used to prevent the transferred liquid from leaking from the mechanical seal part 4, and especially when the fluid is oil, a space for an oil reservoir is provided on the inner peripheral surface of the shaft sleeve 11 from the passage 12 of the shaft sleeve 11. 13 is filled with oil, and the inner circumferential surfaces of the impeller 2 and nut 6 enter, creating the same pressure as the high pressure chamber 20, and these parts become rusted with the rotating shaft 1 due to the gradual intrusion of the transferred liquid from the packing 48. Furthermore, when the pressure in the high pressure chamber 20 increases, the piston part 17 moves backward due to the fluid pressure in the high pressure chamber 20, and a pressure regulating groove provided at the tip of the outer peripheral surface of the piston part 17 moves backward. 27 reaches the position of the fluid escape groove 42 of the mantle 18, the fluid passes through the groove 42, passes through the communication path 41, and enters the tank 39.
The pressure in the high pressure chamber 20 is adjusted, the pressure reaches the low pressure chamber 35 side through the other communication path 40, and is transferred to the high pressure chamber 20 side by the action of the screw part 16 and the piston part 17. This operation is repeated to maintain an appropriate pressure in the high pressure chamber 20 at all times.

Although the temperature of these fluids increases during pump operation, they are cooled by the air blown by the fan 43 provided on the rotating shaft 1.

Next, when the rotation of the pump is stopped, the piston portion 17 moves forward by the force of the pressure adjustment spring 34, the connection between the pressure adjustment groove 27 and the fluid relief groove 42 is broken, and the O-ring 28 causes the piston portion 17 to move forward. A seal is formed between the outer cylinder 18 and the high pressure chamber 20 to pressurize the high pressure chamber 20.

In this type of pump, the inside of the pump casing 3 is often filled with liquid to be transferred even when the rotation of the pump is stopped. Although the intrusion force is strong, the present invention prevents the intrusion by applying pressure fluid to the mechanical seal portion 4 by the force of the pressure adjustment spring 34.

[Effects of the Invention] As described above, the present invention utilizes the screw part provided on the rotating shaft in the bearing box and the slidable piston part, and the pressure regulating spring applied to the piston part to prevent the pump from rotating while the pump is rotating. The pressurized fluid can be applied to the mechanical seal even when it is stopped, and the leakage of the transferred liquid from the mechanical seal can be prevented at all times. By installing the pump in the same location, the entire pump system can be constructed compactly, and the distance between the front bearing and the mechanical seal can be made as short as possible, minimizing vibration at the tip of the rotating shaft. In addition, the screw part and the piston part constitute a screw pump, and the internal fluid is transferred to the high pressure chamber under pressure, and the piston part is installed so that it can slide only in the axial direction, and the piston part and By providing a groove in the mantle and by the function of the pressure adjustment spring that biases the piston, the high pressure chamber can always maintain an appropriate pressure. For example, the piston part serves as the casing of the screw pump, adjusts the pressure in the high pressure chamber, pressurizes the high pressure chamber when the rotating shaft is stopped, acts as a check valve, and serves as the housing for the oil seal. The pressure regulating spring has two roles: pressurization and pressure regulation, and the rotating shaft serves as the impeller shaft, as well as the screw pump and fan shaft. In addition to its original role, the bearing box also serves as a cylinder for the piston and a case for the mechanical seal, and a fan is installed at the rear end of the rotating shaft to avoid wasting cooling water. It is possible to prevent the temperature of the fluid from rising without having to install a large device. Furthermore, by providing a space for an oil reservoir in the shaft sleeve provided at the tip of the rotating shaft, the pressurized fluid can be This allows fluid to enter between these parts and the rotating shaft, preventing them from becoming rusted, and the fluid is also used to lubricate bearings, etc. The fluid performs several functions to extend the life of the machine and facilitate maintenance and maintenance, as well as ease of disassembly during repairs.Moreover, as the piston moves to the rear during operation, the oil seal installed on the piston also moves. However, since a tapered sleeve is provided to accommodate this movement, the tightening force of the oil seal is weakened while the oil seal is moving, and strengthened while the oil seal is stopped, allowing long-term use without diminishing the role of the oil seal. At the same time, the movement of the piston part can be made smoother,
Traditionally, this type of equipment has not been available for quenching oils such as paraffin due to cost and complexity, despite its well-known mechanical advantages. It can be used very easily as a fluid for mechanical seals, and has extremely significant effects such as being able to improve the performance of mechanical seals.

[Brief explanation of the drawing]

The drawing is a sectional view showing an embodiment of the present invention. 1...Rotating shaft, 3...Pump casing, 4...
...Mechanical seal, 5... Bearing box, 11... Shaft sleeve, 12... Passage, 13...
...Oil sump space, 16...Screw part, 17...
... Piston part, 18 ... Mantle cylinder, 19 ... Front wall,
20... High pressure chamber, 21, 22... Through hole, 24...
... Check valve, 25 ... Fluid passage, 27 ... Pressure regulating groove,
30...Fluid passage, 31...Tapered sleeve, 34...Pressure adjustment spring, 35...Low pressure chamber, 3
9... Tank, 40, 41... Communication path, 42...
Fluid relief groove, 43...Fan.

Claims (1)

[Claims] 1. During operation, pressure is applied to the fluid in the bearing box of the rotating shaft by a screw pump consisting of a screw section provided on the rotating shaft and a corresponding piston section, and during stoppage, pressure is applied to the fluid in the bearing box of the rotating shaft. and a pressure adjustment spring, the fluid can be circulated in the bearing box and in the tank provided outside the mantle, and the rear end of the rotating shaft A fan for cooling these fluids is installed in the section, and an oil seal is interposed between the front inner circumferential surface of the slidably installed piston section and a tapered sleeve provided on the rotating shaft. A pump characterized in that the seal is slidable on the tapered sleeve, and the shaft sleeve provided in the mechanical seal portion is provided with a diametrical passage and an oil sump cavity communicating with the diametrical passage.