JPS5932695A - Automatic pumping device - Google Patents

Abstract

PURPOSE:To keep a pumping pressure in constant within a wide operating area by a method wherein a low-pressure generating part, generating a control pressure lower than the pressure of the other part of a delivery pipe, is provided at the downstream side of a branch point between a bypass pipe equipped with an escape valve which is controlled by the control pressure. CONSTITUTION:The delivery pipe 7 is provided with the low-pressure generating part 16, capable of generating the control pressure lower than the pressure of the other part of the delivery pipe as the flow amount is being increased, at a part 15 in the downstream side of the branch point 11. The escape valve 13 is provided with a driving part 17, capable of driving the valve so as to reduce the opening degree of the valve by the reduction of the control pressure. The control pressure P is introduced into a pressure chamber 29 and reduces the flow amount of the pump in accordance with the increase of the flow amount, therefore, the delivery pressure may be kept in constant within the wide range of practical use.

Description

[Detailed description of the invention] The present invention relates to an automatic pumping device ζ2.

When using a water supply φ11 pump, etc., the pump body generally has a characteristic of increasing discharge dispersion and decreasing discharge pressure, so the water pressure at the end faucet f2 will fluctuate during use. However, problems or accidents are likely to occur, such as malfunction of the water heater or fluctuations in the water temperature of the mixing faucet. In order to improve this problem, it is desirable that the pressure be approximately one foot within the usage range, but the speed of the pump? If C2 were used to control the system, the structure would be complicated and costly (2), so in small-scale water supply systems, a bypass pipe with a relief valve and branched from the discharge pipe was installed. however.

Conventional relief valves only control the valve opening by changing the discharge pressure to the vehicle (611), so due to their characteristics, they are completely constant pressure. However, as the flow rate increases, the pressure tends to gradually decrease.On the other hand, since a pressure switch is used to control the start and stop of the pump, it is necessary to widen the usable range. Due to the characteristics of the pressure switch, it is preferable for the pressure fluctuation to be large, and such a request (
It has been proposed to provide a 2L (rise l) part in the discharge pressure curve discharge flow rate characteristic line to increase the minute flow h1 area (for example, Japanese Patent Publication No. 56-1) +711
(No. 18712), in this case, a flow sensing member and a control valve linked thereto are used to control the relief valve. Not only does it require a complicated structure, but also water /711. ! □The present invention has been made under the above circumstances (2) because it requires a thin tube for the pot.

The purpose is to provide a mechanical pump device that (1) can obtain a nearly constant pressure over a wide range of ships, has a simple structure, and is particularly reliable (C2). □ The present invention has a relief valve?
A low pressure generating section is provided in the discharge pipe located downstream and on the side f2 and is capable of generating a control pressure that is 1 degree higher than the pressure in other parts of the discharge pipe as the flow rate increases; The relief valve C is bifurcated and has a controllable drive unit so that its valve opening degree is reduced as the secondary pressure decreases. So, /71Cf
As jt increases, the opening degree of the relief valve decreases by the amount that the control pressure decreases, and this reduces the relief flow rate, which prevents the discharge pipe pressure from dropping by 1 degree. This results in a nearly constant pressure. It was. Since there is no need to provide a thin tube or the like which is likely to cause blockage due to foreign matter C2, reliability is excellent and the structure is simple. moreover.

By starting the pump section by means of a pressure switch, and by having the pump stop and stop the pump section by turning it off against the flow switch, the usable range can be greatly expanded.

Is this the invention of F1? One example of the figure going forward will be explained with one example 0
In FIG. 1, the pump fs15i is connected to the pump body 2 and the drive motor 3, its suction pipe 4 is connected to the foot valve 6 in the water tank 5, and the discharge η'7 is connected to the check valve E8.
Accumulated through B? 11≦9 and faucet i.

I'm being pounded by... A bypass pipe 12 branched from the discharge pipe 7 at a branch point II is connected to a suction pipe 4 (or directly to a water tank 5) via a relief valve 3. The relief valve 13 is configured such that the relief flow h) increases by 11°1' as the discharge pressure increases.

The above-mentioned electric power converter 3 is connected to a control bar 1314 on the start/stop side. The above general +9Zlj is the same as in the conventional device and can be 3-□
The above-mentioned discharge pipe 7 has a branch point 77 J: j+ is also located at 11 and 6 minutes 15 on the downstream side, and as the number position increases, the pressure of the discharge pipe (1,! A low pressure generating section 16 is provided which generates a control pressure.The relief valve 131- is set at one level below the control pressure. immobile-b]
□ Soil-^C: The low pressure generating bar VS16 may be a Venturi tube or the like as shown in FIG. There is. Main body 18
m't in the middle part of the discharge pipe than the downstream part 15 of the discharge pipe.
A narrow portion 2o with a small UIIi product is formed.

The pressure detection tube 19 is provided facing the narrow part 20.
He is holding a mouth rj'lV21.

As shown in FIG. 2, the relief valve 13 is provided integrally with the relief valve 13, and the relief valve 13 includes a valve box 22 and 23 lid bodies.

F box 22 (the second is connected to the bypass pipe 12♂♂71)
1 Renro 24 is formed. J:, JO: Also, 2s is provided in this flow path 24 opening IV-J The lid 23 has one end that is connected to the outer end of the valve shaft 26 to move the valve body 25 in the closing direction C2. Pressure 'f' is also provided with a spring rLi15 material 2 and a spring LL force adjustment 111 original 813 material 28 which is connected to this spring member 27, and the discharge pressure increases as described above. Tru♂, the valve body 25 springs jη1
The valve opening degree is increased by being embossed in the opening direction against the 5 member 27, and the pressure in the -F flow section 15 is reduced.
3 and the pressure chamber 29 formed at j... and this pressure chamber 29
and the inner chamber of the lid body 23 are provided with a T-diaphragm 30 that is connected to the outer end of the valve stem 26,
The pressure chamber 29 is d[] The pressure detection tube 19 of the low/low pressure generating section 6
It is connected to i-1, the normally closed exhaust on-off valve, and connected to 9 - above side h! E<Is/4 is downstream 111 of the discharge pipe
When the pressure at 1 minute t5 (or pressure accumulating section 9) is below a predetermined lower limit value t11j, (-), the pressure switch 92 starts the pump section 1, and iQ& is a predetermined lower limit value. A flow rate switch 33 is provided to stop the flow rate when the flow rate decreases below.

In the device configured as described above, the pump body 2
is equipped with the characteristics shown in Figure 3 (2) by the broken line.If only the relief valves of f double bypass and o゛L were installed, it would not be possible to use the same material as a small T with a single point chain. However, by providing the low pressure generating section 16 and the driving section 17, the characteristic C'a'FrL as shown by the solid line is obtained.
, O, and 'f' are all faucets lθ... are closed and the pump part l is in a stopped state (second, the flow rate in the downstream part I5 of the discharge part is zero and the pressure accumulating part 9 Therefore, the IILE force is kept at the lower limit value 1 (,,, Kl+), so the pressure switch ?2 and the flow, quantity switch 3
3 are both in the open state O In this state, the faucet l
When the kidney is opened, the water in the pressure accumulation part 9 flows out, and the downstream part 151
When the pressure drops below a preset lower limit value H (-1 degree), the king switch 32 is closed and the pump section 1 is started.

This increases the discharge pressure by 1. Tru♂, the valve body 25 of the relief valve 7.9 is displaced in four directions.

A portion of the discharged water flows through the bypass pipe 12. Flow path 2 of relief valve 1'3
When it is guided again to the pump body 2 (or to the water tank 5C2) through 4 yen, the remainder is mainly the inverse ratio valve 8. Discharge pressure raw 51116,
0 guided to the pressure accumulator 9 and the water faucet IO via the flow rate switch 33. Then, when the flow rate passing through the flow rate switch 33 exceeds a preset lower limit (ll!tQl),
The flow and amount switch 33 is closed. In addition, 11 is used by the faucet IO, and the storage [(inflow to the second part 9-
As the pressure increases and 1 (2 pressure rises, the above pressure lower limit value 111, and When reaching T6, the pressure switch 32 is turned off at t3F1 or the flow rate is 1.s Switch 33 remains closed and the pump section l is kept in operation at ℃.Then, when the meteor falls below the lower limit value QI, the flow rate decreases. Switch 33 is opened.

3'] (Secondly, since the pressure switch 32 is already in the open state, the pump part l is stopped.a) During the above-mentioned operation process, the H nickel in the pinched part 20 of the low pressure generating part 16 is , well known by Bernoulli's sleep 1A, the pressure chamber 29 (- is shown in Fig. 4 f A control that decreases as the second-class Q increases.
Force P acts. Such a depressurizing effect is due to the narrow t4 in the chain acid 1 (・4+see J3191) where the flowmeter Q is small.
Since the flow velocity at 132θ is low, it is very small, and characteristic C is actually the same as characteristic B in the conventional device. However, in the subregion (■) where there is a relatively large number of i-forces Q, a remarkable depressurization effect is defined, and the control pressure 1' at the pressure ¥29
Since T increases by 1 degrees, the valve body 25 is displaced by the elastic force (2 to i) of the spring member 27 in the j direction, and the bypass pipe 1:1 decreases by t (-, I: )l LE force rises and the pressure C- shown in characteristic C- is almost constant at "J:, )"
When the flow h1 that is maintained increases further (shipping 1)
In order to lower the pressure P between IJ and T, the valve body 25 is displaced to the closed position by the material 27, and the relief flow meter in the bypass pipe 121 falls to zero. Then, the discharged extra volume is flowed through the flow section 5 of the discharge pipe.Special feature 1 in this overhead Ill: C! T'!
The difference from r 1'ig A is mainly based on '/Hf in the pinched portion 20 and the influence of dynamic resistance ζ2. However, as a pump device that utilizes a soil area, this difference does not cause any problems.S6 According to the above configuration, a discharge pipe part J/ifm and a 1 degree pressure generating part 16fi are provided, and the control pressure P is driven. In order to reduce the relief flow b1 in the relief valve 731- as the flow rate increases (two-sided) in the IE force chamber 29 of the part 17 (two-sided a).
), it is possible to keep the discharge pressure constant over a wide area, both actually and visually, if the characteristic I) actually measured in FIG. 5 is not the same. In addition, the low pressure Gyuto J6 and drive unit I
It is only necessary to provide one pipe between control 1 pressure P i transmission T between 7 and OJ.

Since there is no need to provide many A4 (1) holes through which water flows as in the conventional system R12 mentioned above, the structure is simple and there is no possibility of blockages caused by foreign objects etc. by 1°C. Excellent reliability and excellent fn.
The control section J4 is provided with an Lt switch 32 that starts the pump section 1 at a predetermined pressure lower limit (atl, ) and an a switch 33 that stops the pump section 1 at a predetermined lower limit value Q1. Set the output lower limit value 111 as low as possible before the area where the relief valve 13 is blocked using the vacuum force.
Note a Back, F limit (Region 11-Oi・C where the decrease in control pressure l' is small) [By setting it as small as possible, the usable region 1v can be set sufficiently wide. It should be noted that the present invention is not limited to the above-mentioned embodiments, and various shapes and sizes are possible within the scope of the gist of the invention.

[Brief explanation of the drawing]

Ward 1 City is a one-shot application of the present invention (Da 11?: Showing 5. Figure 1 is a system diagram, Figure 2 is a 1ll (long) cross section, and Figures 3 and 4 are illustrative of operating characteristics. The diagram for 1-11i, the fifth meat is a diagram that shows two examples of the actual 11 characteristics. l...pump field), 4...suction pipe, ?...discharge pipe, 9. ...Gaku pressure capital, II... Branch point, No. 2... Bypass pipe. No., 7... Relief valve, 14... Restraint part, 16... What pressure generation FKIS, l 7.・Kakeru 14171 part, l
q...detection tube, 20...pinching part, 25...valve body,
2. Spring member, 29.' Pressure chamber, 3L)...
Diaphragm, 32...Pressure switch. 33...Ha Li switch〇

Claims (2)

[Claims] (1) A pump part whose discharge pressure decreases as the discharge flow Ct increases, a control part which controls this pump part on the on/off side a-r, and a bypass branched from the discharge pipe of the pump part. and a relief valve whose valve opening degree is controlled according to the discharge pressure (1), and the discharge pipe is located 1 eft below the bypass pipe and the CI+ branch point. (-As the amount of /jj increases, the pressure of the other = B in the discharge pipe increases by 51!). A pump device characterized by having a valve opening valve and a controllable moving part so that the pressure decreases as the pressure decreases. (2) The control section is provided in the discharge pipe and controls the pump section when the pressure decreases below a predetermined F limit value. a soil switch to start the pump, and a fluid switch located on the discharge pipe located downstream of the branch point with the bypass pipe to stop the pump when the device has fallen below a predetermined lower limit. An automatic pump device according to claim 1, comprising: an automatic pump device according to claim 1;