JPS6141495Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a thermostatic mixing faucet.

Conventionally, this type of mixing faucet was used only when the pressure of the supplied hot water and the supplied water were almost equal, or when the pressure difference was small; When used, the supply water is not constantly mixed with the supply water, and only the supply water flows or only the supply hot water flows, resulting in a pulsating flow state. In other words, hunting pulsation occurs. This tendency tends to occur when the opening/closing handle of the mixing faucet is tightened (reducing the amount of mixed water). Further, as in the case where the pressure difference is large as described above, the larger the temperature difference between the supplied water and the supplied hot water, the more likely hunting pulsation occurs.

The reason why hunting pulsation occurs as described above will be explained below. When the thermostat controls the amount of water supplied and the amount of hot water supplied, on the side where the supply pressure is higher (hereinafter referred to as the supplied water side), the pressure is high and therefore the flow rate increases, so the flow path is further narrowed. In some cases, it is narrowed down to almost completely closed. Next, the moment it opens slightly, high-pressure water gushes out. Then, the flow rate of the mixed water increases and the temperature drops due to the jetted water, so the thermostat throttles the water-side flow path again until it is close to fully closed. Hunting pulsation occurs because of this repetition. In other words, high water pressure is ON−
A situation similar to OFF-ON-OFF-... is presented, and this appears as a pulsating flow of mixed water.

In view of the above, the present invention is designed to have small communication holes on the high water pressure side and the mixed water side so that even when the high water pressure side is turned off, the high pressure water is not completely cut off but slightly flows into the mixed water side. By providing the above communication hole, even if the high water pressure side is turned off, a small amount of water can be supplied from the communication hole to prevent the mixed water temperature from changing suddenly. This prevents hunting by making the temperature change gradual and making the thermostat operate smoothly.

Next, an embodiment of the present invention shown in the drawings will be described.

FIG. 1 is a sectional view of a main part of an embodiment of the present invention. 1 is the main body, and a crank 2 that communicates with the water supply pipe
9. It has a water passage 2 and a hot water passage 3 which are respectively connected to a crank 29a which communicates with a hot water supply pipe, and has an internal cavity 33 which communicates with these passages. The main body 1 is provided with a freely swingable water discharge pipe 28 as an outlet for the mixed water and a shower side outlet (not shown), and the two outlet ports and the inner cavity 33
A water discharge control valve 27 is interposed between the communication path and the water discharge control valve 27. This control valve 27 is used to selectively open one of the two outflow ports of the mixed water to adjust the outflow amount, or to close both of the outflow ports. A control valve 6 is housed in the inner cavity 33 . A thermostat 80 is integrally attached to the upper bottom side of the cylindrical control valve 6 with a nut 7. The thermostat 80 includes a temperature sensing part 23 that stores a substance (such as wax) that changes volume by sensing the temperature of the mixed water, a piston 9 that expands and contracts in response to changes in the volume of the wax, and a guide that guides the piston. It consists of case 8 etc. Both end surfaces of the control valve 6 have a lower end surface connected to a hot water sheet 21 (attached to the main body 1) and an upper end surface connected to a water sheet 2.
Together with 0, a hot water control port 25 and a water control port 24 are formed. The control valve 6 moves in the vertical direction, and as it moves downward, the opening gap of the hot water control port 25 decreases until it is fully closed. On the other hand, the opening gap of the opposing water control port 24 increases until it is fully opened. The control valve 6, the hot water seat 21, etc. are stored in the inner cavity 33, and the assembly members are attached and detached using a cover 17 that is screwed to the main body 1.
This is possible by attaching and detaching the A spring 31 is interposed between the hot water sheet 21 member and the control valve 6, and serves to fix the hot water sheet 21 member to the main body 1 and to always bias the control valve 6 toward the water sheet 20 side. . A screw 19 is installed in the hollow part of the cylindrical cover 17.
There is a temperature control spindle 10 that engages with the temperature control spindle 10, and a spring 13 is housed in a bore 15 which is open at one end of the temperature control spindle 10, and a plate 1 that can be slid within the bore 15 by compressing and expanding the spring 13.
1 is housed in the inner cavity 15 with the spring 13 being compressed and biased in advance. At this time, in order to prevent the plate 11 from popping out of the inner cavity 15 due to the biasing force, a retaining ring 12 having spring properties is provided which is engaged with a groove provided near the open end of the inner cavity.
The spring 13 is stronger than the spring 31 so that when the temperature control spindle 10 is operated, the control valve 6 is operated within its movable range. The function of the spring 31 is that the control valve 6 is connected to the hot water seat 21.
The piston 9 may still extend even when seated on the
This is to compress the spring 13 and retreat the plate 11 when the spindle 10 is extended and a force exceeding a predetermined level is applied to the piston 9, in order to prevent damage to various parts and to protect the thermostat 80 from exploding. . The hot water passage 3 extends in an annular manner surrounding the hot water control port 25. Similarly, the water passage 2 also extends in an annular manner surrounding the water control port 24. An O-ring 101 is interposed between the outer periphery of the control valve 6 and the main body 1 so that the water passage 2 and hot water passage 3 do not communicate with each other at the outer periphery of the control valve 6. In addition, each part is sealed,
An O-ring is used to prevent leakage. Further, a C ring 18 is provided at the upper end of the inner surface of the cover 17 to prevent the temperature control spindle 10 from falling off the cover 17. Further, a cylindrical guide 22 concentric with the temperature sensing portion 23 of the thermostat 80 is provided inside the hot water sheet 21. Hot water flows out from the upper end side of the guide 22 to the mixing section, but the mixture is kept above the temperature sensing section 23.
A small communication hole 62 is provided on the side of the control valve 6 that is always in contact with the supply water and communicates with the inside where the thermostat 80 is provided. Communication hole 62
A diameter of φ1.5 is sufficient. Further, a cylindrical flow passage tube 63 whose collar is held is provided between the control valve 6 and the spring 31. Channel cylinder 63
In this case, the supply water flowing out from the outlet 67 through which the supply water passes through the control valve 6 flows through the guide 22 and the control valve 6.
This is to prevent the supply hot water from flowing linearly into the annular hot water chamber 65 formed by the hot water chamber 65 and obstructing the outflow of the supplied hot water. Therefore, the diameter of the channel tube 63 is preferably approximately equal to or smaller than the guide 22, but it is sufficient as long as the linear inflow is suppressed as much as possible. The gap between the guide 22 and the channel tube 63 is defined as a hot water outflow slit 64. A guide 61 that slides on the inner peripheral surface of the cover 17 extends from the upper end side of the control valve 6 . This guide 61 is for smooth operation of the control valve 6 without tilting.

Next, the operation will be explained.

In the case of FIG. 1, water and hot water supplied to the water passage 2 and the hot water passage 3 flow into the inside of the control valve 6 through the water control port 24 and the hot water control port 25. At this time, after passing through the outlet 67, the water is regulated by the flow pipe 63, so that it is mixed with the hot water from the hot water outlet slit 64 so as to prevent it from flowing into the hot water chamber 65 as much as possible.
to the mixing water temperature. If the temperature of the mixed water becomes higher than a predetermined temperature, the piston 9 of the thermostat extends up to the temperature of the mixed water. At this time, since the plate 11 is pressed by the spring 13, the guide case 8 of the thermostat 80 moves downward, and the integrated control valve 6 moves in the direction of closing the hot water control port 25. Therefore, the inflow amount of hot water decreases and the inflow amount of water increases, so that the temperature of the mixed water returns to a predetermined temperature. If the mixed water temperature becomes lower than a predetermined temperature, the piston 9 retracts and moves in the direction of closing the water control port 24 and in the direction of opening the hot water control port 25, so that the mixed water temperature decreases. The temperature of the mixed water will rise to maintain a predetermined temperature. The desired temperature is set by moving the temperature control spindle 10 back and forth to change the position of the plate 11 that regulates the position of the tip of the piston 9. The control valve 27 controls the discharge, water stop, and flow rate of the mixed water from the discharge pipe 28 and the shower.

The pressure of hot water supply in general households is 0.6Kg/cm, which ranks ^second .
The supply water pressure varies widely depending on region and location, ranging from 1 to 7 kg/ ^cm2 . For example, if the control valve 27 is throttled to reduce the flow rate when the mixed water is at 40°C, water with higher pressure will come out more easily and the temperature will drop, causing the piston 9 to contract and the water control port 24 to open. Move in the closing direction. In this case, the higher the supplied water pressure, the greater the amount of water, so the higher the pressure, the closer the water control port 24 is to a fully closed state. Although it is for a short time, it may become fully closed.
If the communication hole 62 is close to fully closed or even if it is fully closed,
Since a small amount of water is supplied from the hot water source, the water and the hot water are mixed to form mixed water, which warms the temperature sensing part 23 of the thermostat. Therefore, the temperature change of the thermostat becomes gradual. If the communication hole 62 is not provided, only hot water will flow when the water control port 24 is fully closed as described above, and the hot water will warm the temperature sensing part 23, and the hot water will suddenly Then, the piston 9 of the thermowax extends and suddenly opens the water control port 24.
At this time, if the supplied water pressure is high, such as 6 kg/cm ² , a large amount of water will be spouted out, and the temperature sensing section 23 will be cooled down rapidly. For this purpose, the piston 9 retracts again and closes the water control port 24. In this way, the control valve repeatedly turns on and off, causing pulsating flow. In other words, it is hunting. In this way, the higher the supply pressure, the greater the pressure difference between the supply hot water and the supply water, the more the control valve 2
The more the pressure in the inner cavity 33 increases as a result of the flow rate being restricted by 7, the more likely hunting is to occur. The reason why it is sufficient that the communication hole 62 has a diameter of 1.5 is because the flow rate flowing through the communication hole 62 increases as the pressure becomes higher and hunting is more likely to occur. In the case of FIG. 1, the communication hole 62 is provided on the supply water side, but if the higher pressure side is the supply hot water side, it will be provided on the supply water side.

FIG. 2 shows a modification of FIG. 1, in which the amount of change in the opening width 72 of the water control port 24 is controlled by the control surface 71 that controls the water control port 24 of the control valve 6. Since the amount of change in operation can be made smaller than the amount of change in operation of No. 6, the amount of water ejected when the water control port 24 is repeatedly turned on and off when the water control port 24 is close to fully closed can be suppressed. Therefore, such a control valve 6
In this case, the communication hole 62 may be even smaller.

In the case of FIG. 3, the size of the communication hole 62 can be changed arbitrarily. An adjustment screw 70 is screwed into the control valve 6, and a communication hole 62a with a varying area is provided in the axial direction of the adjustment screw 70. Therefore,
By changing the screwing amount, the communication hole 62a
You can adjust the size of.

The case shown in Fig. 4 is a modification of Fig. 1, and instead of the communication hole 62, there is a communication groove 62b that is large enough to allow a small amount of water to leak from the sealing surface even when the water control port 24 is fully closed. is provided in the control valve 6. of course,
The communication groove 62b may be provided on the cover side.

As described above, in the present invention, the water supply system and the hot water supply system can be controlled with a single-piece valve, which simplifies the control valve device. As a result, the temperature change of the mixed water is gradual, and rapid expansion and contraction of the thermostat is suppressed, making it possible to provide a mixing faucet with less hunting and pulsation even when the pressure difference between the supplied hot water and the supplied water is large. The conventional problems can be wiped out.

By using the control valve with an angled control surface 71 as shown in FIG. 2, the communicating hole can be made even smaller and a mixing faucet with even less hunting pulsation can be provided.

Furthermore, if the size of the communication hole is made variable using an adjustment screw, a communication hole that suits the usage conditions can be selected, and a comfortable mixing faucet can be provided.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a front view with main parts in section, and FIGS. 2 to 4 are partial sectional views showing other embodiments of the communication part. 1...Main body, 2...Water passage, 3...Hot water passage, 6
...Control valve, 17...Cover, 22...Guide,
23...Temperature sensing part, 24...Water control port, 25...Hot water control port, 62, 62a...Communication hole, 62b...Communication groove, 80...Thermostat.

Claims (1)

[Scope of utility model registration request] A thermostatic mixer faucet that obtains mixed water at a desired temperature by controlling supply water and hot water using a control valve that is linked to a thermostat.
It has a water supply system and a hot water supply system that flow into the mixing section through a water control port 24 and a hot water control port 25, respectively, which are controlled by the control valve, and among these supply systems, the one with the higher supply pressure has a A thermostatic mixing faucet, characterized in that an auxiliary passage is added for introducing fluid from the supply source side into the mixing section regardless of the operating state of the control valve.