JP5789234B2 - Pressure regulator for pump - Google Patents

Description

  The present invention relates to an improvement of a pressure regulator for a pump that automatically adjusts the pressure in a mechanical seal chamber or an oil-sealed motor chamber filled with lubricating oil of various pumps. The present invention relates to a bellows pressure regulator for a pump that can quickly and accurately grasp the abnormality and the degree of abnormality, and that can simplify the structure and greatly reduce the size of the apparatus.

  In general, the motor drive shaft of the pump is secured with lubricity and sealability during rotation by a mechanical seal provided in a mechanical seal chamber filled with lubricating oil. In order for the mechanical seal to perform its function sufficiently, the required amount of lubricating oil is always present in the mechanical seal chamber and the lubricating oil itself does not maintain a predetermined oil quality (quality). Don't be.

  For this reason, various so-called pump pressure regulators have been provided in the mechanical seal chamber of the pump as a mechanism for adjusting the lubricating oil internal pressure in the mechanical seal chamber. Even if the lubricating oil temperature changes and thereby the volume of the lubricating oil changes, the chamber pressure is adjusted to a predetermined pressure value by appropriately changing the volume in the mechanical seal chamber.

  FIG. 5 shows an example in which a pump pressure regulator is provided in a mechanical seal chamber of a submersible pump. In FIG. 5, 1 is a pump motor, 2 is a motor drive shaft, 3 is a mechanical seal, 4 is An impeller, 5 is a mechanical seal chamber, 6 is an annular film body, 7 is a motor chamber, 8 is a pump casing, 9 is a water inlet, and 10 is a water outlet (Japanese Patent Laid-Open No. 55-14938).

In the pump of FIG. 5 described above, when the temperature of the lubricating oil in the mechanical seal chamber 5 rises due to the operation of the pump motor 1 and its volume increases, the annular film body 6 expands to cause the mechanical seal chamber. The volume of 5 increases.
As a result, an increase in pressure in the mechanical seal chamber 5 is prevented, and lubricating oil in the mechanical seal chamber 5 is less likely to leak to the motor chamber 7 side.

  However, since the pressure regulating device for pump shown in FIG. 5 is configured to adjust the pressure (volume) in the mechanical seal chamber 5 using the annular film body 6 made of synthetic resin or metal thin plate, From the viewpoint of the service life, there are problems that it takes time to replace and repair, and that it is difficult to select a large volume adjustment amount.

Therefore, as shown in FIG. 6, a structure in which a stretchable oil chamber 11 made of synthetic rubber or the like is interposed in the mechanical seal chamber 5 of the pump body, thereby changing the volume in the mechanical seal chamber 5. Has been developed and published (Japanese Patent No. 4503722).
In FIG. 6, 11 is an oil chamber, 12 is a spiral chamber, 13 is a water channel, 14 is a motor frame, 15 is an oil supply port, and 16 is an oil supply plug.

  In the pressure regulating device of FIG. 6, the oil chamber 11 is formed in a hollow shape with a stretchable elastic material such as synthetic rubber, and the first operation is performed via lubrication of the mechanical seal 3 and motor heat generation by the operation of the pump. Even when the lubricating oil temperature in the mechanical seal chamber 5a and the second first mechanical seal chamber 5b rises and the lubricating oil volume increases, the volume of the mechanical seal chambers 5a and 5b is reduced by compressing the oil chamber 11. The pressure in the mechanical seal chambers 5a and 5b is adjusted.

  Conversely, when the oil temperature is lowered and its volume is reduced by stopping the pump, the oil chamber 11 is expanded and the volumes of both mechanical seal chambers 5a and 5b are reduced.

  As a result, the lubricating oil level in both the mechanical seal chambers 5a and 5b is always maintained at a constant level regardless of the stoppage of the operation of the pump motor 1, and the lubricating oil level is lowered when the pump is started. There is no such thing as the resulting poor lubrication.

  Furthermore, since the oil chamber 11 is pressurized by the fluid in the spiral chamber 12, the pressure difference between the mechanical seal chambers 5a and 5b and the spiral chamber 12 is reduced, and the fluid enters the mechanical oil chambers 5a and 5b. It becomes difficult to invade.

  The conventional pressure regulating device for a pump shown in FIGS. 5 and 6 can sufficiently exhibit the function of the mechanical seal over a long period of time by always maintaining the lubricating oil level in the mechanical seal chamber at a predetermined position. It has a high substantial utility.

However, many problems to be solved still remain in the conventional pressure regulator for this type of pump.
First, the first problem is that the state of the lubricating oil in the mechanical seal chamber cannot be easily determined from the outside. That is, the pressure adjusting function of the mechanical seal chamber is obtained by providing the pressure adjusting oil chamber 11 in the mechanical seal chamber or by using the annular film body 6 on a part of the wall surface of the mechanical seal chamber. For this reason, there is a problem that the state of the lubricating oil in the mechanical seal chamber cannot be easily determined from the outside, and abnormality such as leakage of the lubricating oil or intrusion of fluid into the lubricating oil cannot be easily determined. .

  The second problem is a structure or function problem of the pump pressure regulator. That is, as shown in FIG. 5, in the case where the annular film body 6 is a part of the constituent material of the wall surface forming the mechanical seal chamber, the area of the annular film body 6 from the point of mechanical strength of the mechanical seal chamber. In other words, there is a limit to the amount of expansion and contraction, and there is a problem that a sufficient pressure regulation function cannot be obtained.

  Further, when the oil chamber 11 is arranged in the mechanical seal chamber as shown in FIG. 6, the oil chamber 11 needs to have a large capacity in order to enhance the pressure regulation function. As a result, the volume of the mechanical seal chamber is increased. There is a problem that it becomes difficult to reduce the size of the pump body.

JP-A-55-14938 Japanese Patent No. 4503732 Japanese Patent No. 4503721 Japanese Utility Model Publication No. 64-39493

  The present invention easily discriminates the above-described problem in this type of conventional pressure regulating device for pumps, that is, the state of the lubricating oil (encapsulated liquid) inside the mechanical seal chamber or the like that is subject to pressure regulation from the outside. This is a solution that solves problems such as inability to perform and sufficient pressure regulation performance and leads to an increase in the size of the pump body, and is simple in structure. The main purpose of the invention is to provide a pressure regulator for a pump which can easily and accurately grasp the state of ()) from the outside and can ensure the lubricity of the mechanical seal stably over a long period of time. Purpose.

According to the first aspect of the present invention, a mechanical seal filled with an encapsulated liquid C is obtained by communicating the inside of a variable displacement pressure regulating chamber installed outside the pump with the inside of the mechanical seal chamber or oil-sealed motor chamber inside the pump. in the pump pressure regulating device to adjust the internal pressure of the chamber or Aburafushiki motor chamber, a variable displacement pressure regulating chamber of the pump pressure regulating device, a cylindrical telescopic bellows 21f, bellows 21f upward The variable capacity pressure regulating chamber 21 is composed of an upper lid 21a having a transparent window plate 21c for closing the opening and a lower lid 21b for closing the lower opening of the bellows 21f. The bellows 21f is expanded and contracted via the sealed liquid C, and the amount of the sealed liquid C and an abnormality in its quality are detected from the expanded and contracted amount of the bellows 21f .

According to a second aspect of the present invention, in the first aspect of the present invention, a protective fence 19 is provided to surround the variable capacity pressure regulating chamber 21.

According to a third aspect of the present invention, in the first aspect of the present invention, the guide bar 20 is erected on the upper lid 21a of the variable capacity pressure regulating chamber 21, and the guide bar 20 is supported by the support member so as to be vertically movable. It is set as the structure which carries out.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the guide bar 20 is slidably supported on the ceiling plate 19b of the protective fence 19 surrounding the variable capacity type pressure regulating chamber 21. .

A fifth aspect of the present invention is the variable capacity type pressure regulating device according to the first, second, third or fourth aspect of the present invention, in which the bellows 21f is expanded and contracted on the side of the variable capacity type pressure regulating chamber 21. An abnormality confirmation cage 22 for detecting an abnormality of the sealed liquid C from the position change of the upper end portion of the chamber 21 is provided.

The bellows type pressure regulating device A of the present invention comprises a variable capacity type pressure regulating chamber 21 forming a main part of the bellows type pressure regulating apparatus A as a main body, and a guide bar 20 provided at the upper end of the variable capacity type pressure regulating chamber 21. The variable displacement pressure regulating chamber 21 is configured to guide the expansion and contraction movement.
Therefore, a change in the volume of the encapsulating liquid C is regularly reflected as a change in the amount of expansion / contraction of the bellows 21f, so that an abnormal detection of the amount of the enclosing liquid C and the pressure in the mechanical seal chamber can be adjusted accurately.

  In addition, since the transparent window plate 21c is used as a part of the constituent material of the variable capacity type pressure adjusting chamber 21, the inside of the variable capacity type pressure adjusting chamber 21 is visible from above, so that the variable capacity type pressure adjusting chamber 21 can be viewed. It is possible to visually detect a change in the color or amount of the sealing liquid C in the chamber 21 or a foreign substance.

  Further, since the pump pressure regulator A is provided independently of the mechanical seal chamber 5 and the like, it is possible to avoid an increase in the size of the pump body due to the provision of the pressure regulator function, and the pump pressure regulator A Can be easily performed, and the life of the pump body is greatly extended as compared with the case where the mechanical seal chamber 5 having a conventional pressure regulating function is used.

  In addition, by using the bellows 21f as a constituent material of the variable capacity pressure regulating chamber 21, the expansion of the sealed oil C can be easily absorbed, and an air pocket is not required. As a result, the mechanical seal 3 can be smoothly lubricated without being affected by the change in the posture of the pump, and can be easily applied to a portable pump or the like.

It is a longitudinal cross-sectional schematic diagram of the pump which provided the pressure regulator for pumps which concerns on this invention. It is a perspective view which shows the installation state of the pressure regulator for pumps which concerns on this invention. It is a disassembled perspective view which shows the structure of the pressure regulator for pumps which concerns on this invention. It is explanatory drawing which shows an example of the abnormality detection of the sealing liquid by the pressure regulator for pumps which concerns on this invention. It is explanatory drawing which shows the conventional pressure regulator for pumps. It is explanatory drawing which shows the other example of the conventional pressure regulator for pumps.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 4, the same reference numerals are used for the same parts and members as in FIGS. 5 and 6.

FIG. 1 shows a case where the pump pressure regulator A according to the present invention is applied to a pump B. In FIG. 1, A is a pump pressure regulator, B is a pump, and C is a sealed liquid (lubricant). Oil), 1 is a pump motor, 2 is a motor shaft moving shaft, 3 is a mechanical seal, 4 is an impeller, 5 is a mechanical seal chamber, 7 is a motor chamber, 8 is a pump casing, 9 is a water inlet, 13 is a water channel, 14 Is a motor frame, 17 is a support frame, and 18 is a connecting pipe.
Since the pump B itself is well known, detailed description thereof is omitted here.

The pump pressure regulator A is placed on a support base 17 provided at the top of the pump body, and the pump pressure regulator A and the mechanical seal chamber 5 are connected in an airtight manner by a connecting pipe 18. . That is, the sealed liquid C in the pump pressure regulating chamber A and the sealed liquid C in the mechanical seal chamber are communicated.
In the embodiment of FIG. 1, the connecting pipe 18 is used to communicate the inside of the pressure regulating chamber A for pump and the inside of the mechanical seal chamber 5, but the communicating hole that changes to the connecting pipe 18 in the casing of the pump body. (Not shown) may be formed, and the sealing liquid C may be communicated through the communication hole.

The variable capacity type pressure adjusting chamber 21 constituting the main part of the pump pressure adjusting device A is formed mainly of a cylindrical bellows 21f as will be described later, and the variable capacity type pressure adjusting chamber 21 is formed. Is disposed in a protective fence 19 as shown in FIG.
Further, a guide bar 20 is erected on the upper surface side of the variable capacity pressure regulating chamber 21, and an upper part thereof is slidably inserted into a support body such as a ceiling plate 19 b of the protective fence 19. . Thereby, the expansion-contraction movement to the up-down direction of the bellows 21f of the variable capacity type pressure regulation chamber 21 is performed smoothly.

  FIG. 2 is a perspective view showing an installation state of the variable capacity type pressure regulating chamber 21 according to the present invention, by combining a plurality of pipe members 19a, a ceiling plate 19b, and a bottom plate 19c having appropriate lengths. A cylindrical cage-like protective fence 19 is formed and supported and fixed on a support base 17 fixed to the pump body. A variable capacity type pressure regulation chamber 21 is disposed in the protective fence 19, and the upper part of the guide bar 20 standing on the upper surface of the protective fence 19 is inserted through the ceiling plate 19 b of the protective fence 19 to・ It is supported to move freely.

FIG. 3 is an exploded perspective view showing the structure of the pump pressure regulator A provided with the protective fence 19 shown in FIG. 2, and the variable displacement pressure regulator chamber 21 constituting the main part of the pump pressure regulator A. The transparent window plate 21c, packing 21d, upper reinforcing ring 21e, bellows 21f, lower reinforcing ring 21e, packing 21d are bolt nuts between the upper lid 21a and the flange-shaped lower lid 21b. Is formed in a cylindrical stretchable and airtight structure by airtightly fixing with the upper end of the bellows 21f (the upper lid body 21a and the transparent window plate 21c of the variable capacity pressure regulating chamber 21). It expands and contracts by a certain dimension in the vertical direction (vertical direction).
In FIG. 3, 21g is an air vent plug, and 20 is a guide bar erected on the upper lid 21a.

  The protective fence 19 is formed in a cylindrical cage shape by arranging and fixing a plurality of pipe members 19a between the ceiling plate 19b and the bottom plate 19c, and the ceiling plate 19b has a peephole 19d. Is provided.

  The bellows 21f is formed using a synthetic resin plate material or a stainless steel thin plate material having an appropriate thickness, and the internal volume thereof is selected as an appropriate volume according to the internal volume of the mechanical seal chamber 5 or the like. .

  The transparent window plate 21c and the like are provided so that the state in the variable displacement pressure regulating chamber 21 can be visually confirmed from above the pressure regulating device A for the pump. It is possible to directly check the discoloration of the liquid C, contamination of foreign matters, and the like from the outside.

Table 1 shows the specifications of the pressure regulator for a pump according to the embodiment of the present invention.

Next, the operation of the pump pressure regulator A according to the present invention will be described.
With reference to FIG. 1, first, the pressure regulating device A for the pump is installed on the support base 17 and fixed to the upper lid 21 a of the variable capacity type pressure regulating chamber 21 to the insertion hole of the ceiling plate 19 b of the protective fence 19. The guide bar 20 is inserted, and the bellows 21 f forming the variable capacity type pressure regulating chamber 21 is brought into a state in which it can be smoothly expanded and contracted, and the pressure regulating chamber 21 and the mechanical seal chamber 5 are connected by the connecting pipe 18.

Next, the air vent plug 21g of the variable capacity type pressure adjusting chamber 21 is opened, and a predetermined amount into the variable capacity type pressure adjusting chamber 21 and the mechanical seal chamber 5 (or the variable capacity type pressure adjusting chamber 21 and the oil seal motor chamber). In addition, the air vent plug 21g is closed after the filling liquid C is filled.
As a result, the inside of the mechanical seal chamber 5 (or the oil-sealed motor chamber) is completely filled with the filled liquid C, and the lubricating oil C reaches the top of the mechanical seal 3 completely. Thereby, better lubricity is maintained. In the case of an oil-sealed motor chamber (not shown), the filled liquid C reaches the entire area of the oil-sealed motor chamber.

  Further, since the expansion of the sealing liquid C is absorbed by the expansion of the bellows 21f of the variable capacity type pressure regulating chamber 21, it is not necessary to provide an air reservoir in the mechanical seal chamber 5 (or the oil seal motor chamber). As a result, in the portable pump, even if the pump posture changes, the lubricity of the mechanical seal 3 is ensured without being affected by the posture change.

  Referring to FIG. 4, when there is no abnormality in the amount and quality of the liquid (lubricating oil) C in the mechanical seal chamber 5 (or oil-sealed motor chamber) of the pump B, the variable capacity pressure regulating chamber 21 As shown in FIG. 4A, the upper end portion (ie, the upper lid body 21a) is positioned within the normal range N, and the mechanical seal chamber 5 and the like are placed in a predetermined enclosing liquid C. It is adjusted and held at a pressure determined by the amount of liquid.

Further, when the mechanical seal chamber 5 as sealed liquid C is leaked, the upper end portion of the variable capacity type pressure regulating chamber 21, as shown in (b) of FIG. 4, located below the abnormal range E ₁ Will do.

Additionally, water or the like into the mechanical seal chamber 5 when that has flowed has an upper end portion of the variable capacity type pressure regulating chamber 21, as shown in (c) of FIG. 4, is located above the abnormal range E in ₂ It will be.

  In the present embodiment, the variable capacity pressure regulating chamber 21 is not visually provided, and the position of the upper end portion of the variable capacity pressure regulating type 21 is visually confirmed without providing a cage for abnormality detection. The occurrence of an abnormality in the enclosed liquid C is detected, but a visual abnormality confirmation cage 22 is provided on the side of the variable capacity pressure regulating chamber 21 or an automatic alarm type abnormality confirmation device. Of course, it may be provided.

  Abnormalities such as discoloration of the sealing oil C, mixing of foreign matter, and liquid level fluctuation can be visually confirmed through the transparent window plate 21c above the variable capacity pressure regulating chamber 21, and the variable capacity can be periodically changed. By visually inspecting the inside of the mold pressure adjusting chamber 21, it is possible to detect an abnormality in the amount and quality of the encapsulated liquid C, an abnormality due to contamination with foreign matter, and the like.

  In FIG. 1, the abnormality detection of the encapsulated liquid C in the mechanical seal chamber 5 has been described. However, the present invention is applicable to a pump using an oil seal motor in which the encapsulated liquid C is filled in the motor chamber. Of course, the pump pressure regulator A according to the above can be applied. In this case, the water depth and the pressure in the motor chamber can be regulated, and the submersible motor can be used under a high water depth.

  The present invention can be used not only as a pressure regulator for a mechanical seal chamber of any pump, but also applicable to a pressure regulator for a motor chamber such as a submersible pump using an oil-sealed motor.

A Pump pressure regulator B Pump C Filled liquid (lubricating oil)
N Normal range E ₁ Lower abnormal range E ₂ Upper abnormal range 1 Pump motor 2 Motor drive shaft 3 Mechanical seal 4 Impeller 5 Mechanical seal chamber 5a First mechanical seal chamber (first oil chamber)
5b Second mechanical seal chamber (second oil chamber)
6 annular film body 7 motor chamber 8 pump casing 9 water inlet 10 water outlet 11 oil chamber 12 swirl chamber 13 water channel 14 motor frame 15 oil inlet 16 oil inlet plug 17 support base 18 connecting pipe 19 protective fence 19a pipe material 19b ceiling plate 19c Bottom plate 19d Peep hole 20 Guide bar 21 Variable capacity pressure adjusting chamber 21a Upper lid 21b Lower lid 21c Transparent window plate 21d Packing 21e Reinforcement ring 21f Bellows 21g Air vent plug 22 Abnormality confirmation gauge

Claims (5)

Mechanical seal chamber or oil-sealed motor filled with sealing liquid (C) by communicating the inside of the variable capacity pressure regulating chamber installed outside the pump with the inside of the mechanical seal chamber or oil-sealed motor chamber inside the pump in the pump pressure regulating device to adjust the internal pressure of the chamber, the variable displacement regulating chamber of the pump pressure regulating device, a cylindrical telescopic bellows (21f), bellows (21f) upper opening A variable capacity pressure regulating chamber (21) comprising an upper lid (21a) having a transparent window plate (21c) for closing the lower lid (21b) closing a lower opening of the bellows (21f), The bellows (21f) is expanded and contracted via the sealed liquid (C) in the variable capacity type pressure regulating chamber (21), and the amount of the sealed liquid (C) and the quality of the bellows (21f) are expanded and contracted. configuration and the pump to detect Pressure regulator. The pressure regulating device for a pump according to claim 1, wherein a protective fence (19) surrounding the variable displacement pressure regulating chamber (21) is provided. Erected a guide bar (20) on the upper lid (21a) of the variable displacement regulating chamber (21), in claim 1 which is configured to be vertically movably supported by the support member the guide bar (20) The pressure regulator for pumps as described. The pressure regulating device for a pump according to claim 3, wherein the guide bar (20) is slidably supported on a ceiling plate (19b) of a protective fence (19) surrounding the variable displacement pressure regulating chamber (21). . For confirming an abnormality in the side of the variable capacity pressure regulating chamber (21), which detects an abnormality in the sealed liquid (C) from the position change of the upper end of the variable capacity pressure regulating chamber (21) due to expansion and contraction of the bellows (21f). The pressure regulating device for a pump according to claim 1, 2, 3, or 4 , wherein the cage (22) is arranged.

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