JPS6111567Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial field of application) This invention relates to a temperature control valve with a constant flow valve, and when the temperature of the passing fluid is below the set temperature, regardless of the differential pressure across the valve body, A constant flow rate is constantly passed through the operation of the constant flow valve, but when the temperature of the passing fluid exceeds the set temperature, the piston-type valve body is activated as the temperature rises to automatically reduce the flow rate of the passing fluid. It is something to control.

(Conventional technology) In the hot water circulation circuit for district heating,
As a result of heat dissipation, the return temperature is lower than the feed temperature. However, when the amount used is small, the amount of heat released is small and the return temperature is also relatively high. In such cases, there is no need to return hot water for heating.

Therefore, a valve is needed that can open the circuit to avoid circulation at a constant flow rate when the amount of heat dissipated is large and the return temperature is low, and close the circuit when the amount of heat dissipated is small and the return temperature is high.

However, no valve with such a function has been known so far, and two parts, a temperature control valve and a constant flow valve, have to be combined, resulting in poor workability.

Furthermore, conventional constant flow valves have an orifice that is moved to move forward and backward relative to a rotated needle valve, which is prone to leakage and difficult to miniaturize. In addition, in models with movable needle valves, surging phenomenon is likely to occur due to the vibration of the needle valve, and in order to prevent this, it is necessary to
A complex damper structure, such as that disclosed in No. 38975, was required.

(Means for solving the problem) This invention satisfies the above requirements in district heating by integrally connecting a constant flow valve to the secondary side of the temperature control valve, and the temperature control valve A piston-type valve body 9 biased downward by a spring 18 is vertically fitted into a valve seat provided between the primary side and the secondary side, and a notch is formed in the upper and lower middle portions of the piston-type valve body 9. A groove 16 is provided in the axial direction, and the piston type valve body 9
The lower end surface is supported by a spindle 4 of a wax thermoelement (which uses the thermal expansion of wax sealed in a casing to raise the spindle) 5 to obtain a temperature control valve with reliable operation. Furthermore, the constant flow valve has a fixed orifice 32 on the outflow side, a damper 30 is fixed on the inflow side, and the base of the needle valve 25 is fitted loosely into the damper 30, thereby eliminating the possibility of surging. The above-mentioned problems have been solved by obtaining a small-sized constant flow valve.

(Function of the device) In this device, if the temperature of the passing fluid is above the set temperature, the temperature control valve closes and the fluid flow is cut off, and if it is below the set temperature, the constant flow rate is maintained at a constant flow rate by the action of the constant flow valve. The amount will flow.

Therefore, flow rate control based on temperature is performed by one valve device.

Examples of this invention will be described below based on the drawings.

(Example) A wax thermoelement 5 having a spindle 4 is installed in the primary chamber 3 connected to the inlet 2 of the main body.
is installed vertically, and the valve seat 7 provided between the primary chamber 3 and the secondary chamber 6 and the cylinder part 8 of the secondary chamber 6
A piston-type valve body 9 is fitted in the holder so as to be able to move up and down, and a constant flow valve 11 is attached to an outlet 10 connected to the secondary chamber 6. Secondary room 1 which communicates with primary room 3 through
A bonnet 15 having an adjustment bolt 14 screwed onto the inner periphery is screwed onto the bonnet 3.

The piston-type valve body 9 has a cutout groove 16 provided in the upper and lower intermediate portions of the circumferential wall in the axial direction. It is pushed by a spring 18 in a spring receiving hole 17 at the upper end, and is engaged with the spindle 4 of the wax thermoelement 5 at an engagement hole 19 at the lower end, so that it is held movable up and down. In addition, 20 in the figure
21 is an O-ring provided on the adjustment bolt 14, and 22 is a nut screwed onto the adjustment bolt 14 outside the bonnet 15. Further, the above temperature setting is based on the wax thermoelement 5, and the adjustment is performed by changing the load of the spring 18 with the adjustment bolt 14 of the bonnet 15. After adjustment, the adjustment bolt 14 is fixed with the nut 22. do.

Next, a configuration example of the constant flow valve 11 described above will be explained (FIGS. 4 and 5). A valve seat is fixed on the outflow side of the outlet 10, and an orifice 32 is provided on the valve seat. On the other hand, a damper holder 29 having a fluid passage 31 is fixed on the inflow side of the outlet 10. The damper holder 29 has retaining rings 35, 35 fitted in two grooves 34, 34 formed in the main body 1, and a damper 30 protrudes from the center of the inside. . The damper 30
A damper engagement hole 24 provided at the base of the needle valve 25 is engaged with the damper engagement hole 24, and the needle valve 25 is capable of moving forward and backward relative to the orifice 32. A valve holder 23 having a through hole 26 is connected to the outer side of the base end of the needle valve 25, and a valve holder 23 is provided between the valve holder 23 and the valve seat to urge the valve holder 23 toward the inflow side. A spring 33 is interposed.

Therefore, the fluid flowing into the outlet 10 from the secondary chamber 6 acts on the valve holder 23, and due to the pressure receiving action in the pressure receiving section described below, the needle valve 25 operates in relation to the spring 33, and a constant flow rate is maintained at the orifice 32. controlled, providing the effect of a constant flow valve.
In this case, since the pressure difference between the inside and outside of the portion 28 of the valve holder 23 is always constant, the portion 28 is irrelevant to the pressure receiving action, and only the portion 27 functions as a pressure receiving portion.

Therefore, the pressure receiving part can be minimized, and the spring 3
Since the load on spring 3 is reduced, spring 3
3 can be made weaker, and the overall size can be made smaller. Further, since the orifice 32 is fixed to the main body 1, leakage occurring between the valve holder 23 and the main body 1 has no effect on the flow rate control function, making it easy to control the accuracy of the valve holder 23. Further, as described above, the needle valve 25 moves forward and backward relative to the orifice 32 in response to fluctuations in the pressure received by the pressure receiving section. Since the needle valve 25 is braked, the needle valve 25 is braked.
The surging phenomenon caused by the resonance effect of the spring 33 caused by the vibration of the spring 33 is prevented, and a stable flow rate control effect can be obtained.

According to the above embodiment, when the temperature of the fluid flowing in from the inlet 2 is below the set temperature, the spindle 4 of the wax thermoelement 5 is recessed, the valve body 9 is pushed by the spring 18, and the valve seat 7 sliding surface 7
a is in sliding contact with the central part of the valve body 9 where the notch groove 16 is located. In this state, since the inlet side and the outlet side of the notch groove 16 of the valve body 9 have the same body area, the fluid flows smoothly from the primary chamber 3 to the secondary chamber 6 via the notch groove 16, and further flows at a constant flow rate at the outlet 10. The operation of the valve 11 causes a constant flow to flow out from the orifice 32.

Further, when the temperature of the fluid flowing in from the inlet 2 exceeds the set temperature, the spindle 4 protrudes due to the action of the wax thermoelement 5, and the valve body 9 rises against the spring 18, and the sliding surface of the valve seat 7 7a
comes into sliding contact with a portion of the valve body 9 where the notch groove 16 is not provided.
In this state, the area on the inlet side of the notched groove 16 of the valve body 9 is gradually narrowed down to control the flow rate, and finally the primary chamber 3 and the secondary chamber 6 are cut off, and the fluid flows into the secondary chamber 6. No inflow.

(Effect of the invention) According to this invention, when the temperature of the passing fluid is below the set temperature, a constant flow rate is constantly passed through the operation of the constant flow valve, regardless of the differential pressure across the valve body. When the temperature of the passing fluid exceeds a set temperature, the amount of fluid passing through can be automatically reduced or cut off by operating the piston-type valve body as the temperature rises.

Furthermore, since the constant flow valve is equipped with a damper, there is no risk of surging occurring.

[Brief explanation of the drawing]

Figures 1 and 2 are cross-sectional views of the embodiment of this invention, with Figure 1 showing the temperature control valve in an open state, Figure 2 showing the same closed state, and Figure 3 showing the same piston type valve. 4 and 5 are enlarged sectional views of the constant flow valve according to the embodiment of the invention, with FIG. 4 showing the open state and FIG. 5 showing the throttled state. 1...Main body, 2...Entrance, 3...Primary room, 6...
...Secondary chamber, 7...Valve seat, 8...Cylinder part, 1
0... Outlet, 16... Notch groove, 23... Valve holder, 24... Damper fitting hole, 25... Needle valve, 26... Hole, 29... Damper holder, 3
0...damper, 32...orifice.

Claims (1)

[Claims for Utility Model Registration] A constant flow valve is integrally connected to the secondary side of a temperature control valve, and the temperature control valve has a valve seat provided between the primary side and the secondary side. A piston-type valve body 9 biased downward by a spring 18 is vertically fitted in the piston-type valve body 9, and a cutout groove 16 is provided in the axial direction at the upper and lower intermediate portions of the piston-type valve body 9. The lower end surface is supported by the spindle 4 of the wax thermoelement 5, and the constant flow valve has a fixed orifice 32 on the outflow side.
, a damper 30 is fixed on the inflow side, and a base of a needle valve 25 is loosely fitted into the damper 30 so as to be able to move forward and backward with respect to the fixed orifice 32.