JPH0235280A - Manufacture of coolant opening/closing valve body in cooling and warming device - Google Patents

Abstract

PURPOSE:To permit the molding using a metal mold by forming an opening/ closing valve body for coolant from thermoplastic resin, ceramics, or molten metal. CONSTITUTION:As for an opening/closing valve body for coolant, a low pressure coolant feeding inlet 13, feeding outlet 14, high pressure coolant feeding inlet 15, and a feeding outlet 16 are allowed to communicate from outside to a valve chamber 12 having a valve rod insertion port 11 opened on the upper surface 10. The valve body is made by using a metal mold, using thermoplastic resin, ceramics, and molten metal as material. Therefore, the material cost can be reduced to about 1/10 of a conventional device, and the production cost in each process can be reduced to 1/5-1/10.

Description

Detailed Description of the Invention [Field of Industrial Application] This invention relates to a method for shutting off refrigerant and replenishing refrigerant in an air-conditioning and heating system that has an outdoor unit and an indoor unit, which is called a senorate type. The present invention also relates to a method of manufacturing a valve body of a refrigerant on-off valve used when removing internal pressure air.

[Technical background]

The technical concept of opening and closing two high- and low-pressure refrigerant circuits for use in a central-rate type air conditioning system using a single on-off valve is already known, and the form of the opening and closing action of these on-off valves is This method is disclosed in, for example, Japanese Patent Publication No. 58-54348, etc., in which the valve stem is spirally propelled and retreated in the longitudinal direction, and the valve head is moved into and out of contact with the valve seat having the valve port in the valve chamber to open and close the valve passage. The technology used here, and the valve structure that is still under development, rotates the valve stem within the valve chamber, creating a valve hole that opens on the outer periphery of the valve stem, and an opening on the inner wall of the valve chamber of the valve body that encloses the valve stem. There are two types of refrigerant opening/closing valves in which the technical idea is to connect with a port and conduct/cut off the refrigerant using a valve stand.This invention belongs to the latter type of refrigerant on/off valve that rotates the valve stem. .

[Conventional technology]

Refrigerant on/off valves used in air conditioners are available in two types: single-path type, which uses both the high-pressure side and low-pressure side individually, and two-way type, which uses both the high-pressure side and low-pressure side.
There is a type that opens and closes the circuit with a single valve body, and both of these two types of on-off valves have a female thread in the valve chamber and a male thread on the valve stem, which are screwed together to form the valve. The valve is constructed in such a way that the valve stem is propelled in a spiral motion by a rotational operation given to the valve, and the propulsive force is used to forcibly bring the valve stem into close contact with the valve seat of the valve body, thereby cutting off the refrigerant. widely known.

[Problem to be solved by the invention]

In the refrigerant on-off valve, the above-mentioned method in which the valve stem and the valve body are screwed together and the valve stem is propelled by the rotation given to the valve stem is such that the valve head of the valve stem is isolated from the valve seat of the valve body. In order to increase the effectiveness, it is necessary to apply a high torque of about 100 to 200 kg, m to the threaded portion, and therefore the strength of the threaded portions of the valve body and valve stem are important factors.

In addition, in order to ensure shutoff performance, it is necessary to precisely machine the valve seat part of the valve body and the valve head that contacts the valve opening of the valve seat, and in addition, the valve seat part of the valve body side, the female thread part, and Precise machining is required for the position of the valve head and the straightness (coaxiality) of the male thread on the valve stem.

Therefore, these materials require careful selection of the metals used and ultra-precision processing, making them expensive.

On the other hand, the valve body of the refrigerant on-off valve of the present invention is of a type in which the valve stem within the valve chamber is rotated without using any screwing means.

In the valve stem rotation method, fluid communication is controlled by a valve hole that opens on the outer periphery of the valve stem as the valve stem rotates inside the valve chamber, and a joint/valve stand that opens on the inner wall of the valve chamber with each port. Since it is not equipped with a threaded engagement means, no torque other than that required for rotation is required to rotate the valve stem, and therefore, the material strength of the valve stem and the valve body that forms the valve chamber is the same as that of the above-mentioned threads of the valve stem. Focusing on the fact that it has much lower strength than the metal material that forms the valve body of the dynamic propulsion method, it can be used for months.
Therefore, it has been found that a wide variety of thermoplastic resins can be used as the material due to its strength.

As mentioned above, if thermoplastic resin can be used as the material due to its strength, it is also possible to use a molding method for manufacturing it, and molding using this mold is possible. When it comes to the second issue, the molding accuracy of the molded body becomes a new issue to consider.

Therefore, as mentioned above, the valve stem is made of resin-based rubber as a sill layer on the outer periphery of the valve stem, which enables close sliding even in the valve chamber of the valve body formed by molding. (The applicant of Utility Application No. 186896/1986 is the same as the applicant of this patent), the required circuit torque can be reduced to 5.
kg. t'm was extremely low and we were able to solve all the problems.

In this way, the molding material for the valve body can be a thermoplastic resin, a ceramic that can be molded as required, or a molten metal, such as aluminum, as the case may be. In addition, when the valve body is molded with a mold, the female end portion into which the conduit flare nut is screwed can be cast at the same time as separately manufactured parts.The entire valve body is made of a molded body. The purpose is to try.

[Failure to solve the problem]

This invention relates to a method of manufacturing a valve body of a refrigerant on/off valve in an air-conditioning machine by molding thermoplastic resin, ceramic, or molten metal with a mold. The refrigerant on-off valve body, which communicates the low-pressure refrigerant inlet and outlet and the high-pressure refrigerant inlet and outlet from the outside, is molded from thermoplastic resin, ceramic, or molten metal. It is.

On each day, a valve chamber with a valve stem insertion port on the soil surface is connected to a pipe line forming a refrigerant circuit through a low-pressure refrigerant inlet and outlet, and a high-pressure refrigerant inlet and outlet. In addition, the refrigerant on-off valve body, which has a fluid passage for replenishing refrigerant or venting air at the tip of a nozzle that protrudes from the outer periphery of the valve body, is made of thermoplastic resin or ceramic. It is made by molding using a metal mold or a bath melting metal as a material.

Furthermore, in the valve body of the refrigerant on-off valve in the air conditioner/heater as described above, short and small metal pieces for connecting to the conduits forming the refrigerant circuit are provided at the inlet and outlet ports for the low-pressure refrigerant and the high-pressure refrigerant, respectively. 7 on the end and outer circumference of the pipe end material
U;
The valve-closing body is made of thermoplastic resin, ceramic, or molten metal and is molded using a mold.

Furthermore, in the valve body of the refrigerant on-off valve in the air-conditioning/heating machine, the ends of the pipes forming the refrigerant circuit or the pipes are connected to the inlet and outlet for the low-pressure refrigerant and the high-pressure refrigerant, respectively. A flare mouth member having a male thread that can be screwed into the female thread of a flare nut on the end and outer periphery of a cylindrical piece member that can be easily connected to a short or small metal pipe material connected to the end is attached to the inlet and the outlet in the mold. The main body of the refrigerant on-off valve is molded entirely from thermoplastic resin, ceramic, or molten metal.

1. At each inlet and outlet for low-pressure refrigerant and high-pressure refrigerant, the short and small metal tubes connected to the conduits forming the refrigerant circuit can be connected to the conduits of the circuit or the metal tubes. It is a flare mouth member that has a male thread on the piece member and outer periphery that can be screwed into the female thread of a flare nut, and an uneven part, annular groove, or widened part is provided on the outer periphery of the part embedded in the valve body to increase the contact area. At the same time, it is possible to prevent the phenomenon of the valve being removed from the valve body.

[Effect]

A basic mold that can be molded by detachment movements that can be divided into individual molds, and a mold that includes an auxiliary mold in the shape of a carrot, is mainly made of thermoplastic resin, and in some cases ceramic or e.g. The valve body of the refrigerant on-off valve is molded from molten metal such as aluminum.The valve chamber, which opens on the top, has an inlet and an outlet for low-pressure refrigerant from the outer periphery of the valve body. Basically, the inlet and outlet for the valve are cast so that they pass through the valve chamber 'Iff that forms the outer periphery of the valve body, and the valve chamber and the outer periphery of the valve body communicate with each other. , the valve body to be inserted rotates, and the outer periphery of the valve body forms a valve chamber in which it can closely slide, and the valve chamber is provided with a valve chamber for low-pressure refrigerant and high-pressure refrigerant that communicates with the outside as described above. Inlet ports and outlet ports, as well as fluid passages for replenishment of refrigerant and air removal as needed, can be formed in a single molding process, and each of the two inlet ports and outlet ports As a process before filling each of the molding materials with the molding material, a short or small metal pipe material connected to the pipe line forming the refrigerant circuit or the above-mentioned
A piece member that can be easily connected to the conduit that forms the refrigerant circuit including short and small metal pipe materials, and a male piece that can be screwed into the female thread of the flare nut at both outlet forming positions in the mold. A flare mouth member having a screw on the outer periphery is installed in advance, and then the metal pipe material or piece member placed in front and the flare mouth member are cast into a molded body to form an integral shape. In these cases, an uneven part, an annular groove, or an enlarged part is provided on the outer periphery of the part to be cast, so that the contact surface of the part to be cast can be increased and the pull-out resistance can be increased.

Furthermore, it is also optional to simultaneously cast a nozzle body for forming a fluid passage provided as necessary as a separate member having the same structure as the flare mouth member at the same time when forming the mold.

〔Example〕

Next, an example of the method using the injection molding method when the material is entirely thermoplastic resin will be explained with reference to the drawings. Figures 1 and 2 show the basic cross section of the mold. In the figure, (1) shows a fixed mold, which can be divided into parts and disassembled as necessary to facilitate detailed molding.In addition, there is a bottle-shaped auxiliary mold (3). will be added. (
4) shows the sprue for injecting the material, as shown in Figure 3 1'l.
: Molded body (I) was molded by the mold shown in Figure 1, molded body (II) was molded by the mold shown in Figure 2, and these molded bodies (I) and (II) were molded for the purpose. The valve body has a valve chamber (12) with a valve stem insertion port (11) on the top surface (10), and a low-pressure refrigerant inlet (13), an outlet (14), and a high-pressure refrigerant inlet (15). In addition, the outlet (16) is formed by a protrusion (18) that protrudes from the outer wall (17) forming the outside of the molded body (I), (II).
), and the delivery portions (14) and (16
) on the outer periphery of the tip of the protrusion (18) with a male screw (19) into which a flare nut (not shown) can be screwed. r to constitute a basic molded body.

Further, a fluid passage (for the purpose of replenishing refrigerant or venting air) is provided at an arbitrarily set position on the circumference passing through the installation position of both or either of the low-pressure refrigerant inlet (13) and the high-pressure refrigerant inlet (15). 20) communicates the tip of the nozzle (21) protruding from the outer wall (17) with the valve chamber (12), and a male screw (19)' is provided on its outer periphery to which the lid can be screwed.

Depending on the protruding angle of this nozzle (21), a partially rotating type may be used.

Furthermore, each of the low-pressure refrigerant inlet (13) and the high-pressure refrigerant inlet (15) has a short metal tube (22) connected to a conduit forming a refrigerant circuit. 22) can be screwed into the female thread of the flare nut with any of the piece members (23) for which the connection has been formed in advance, and the outlet port (14) for the low pressure refrigerant and the outlet port (16) for the high pressure refrigerant, respectively. Male screw (1
In order to insert mold each of the flare mouth members (24) that have been formed in advance with 9) provided on the outer periphery, the mold was installed to penetrate through a predetermined position of the mold that forms the mold for the valve chamber installed in the mold. The auxiliary mold (3) K is pushed through so as not to form an inner cavity, and the metal pipe material (22) 6 or the piece member (23) and the flared mouth member (24) and, if necessary, the fluid passageway (20).
The nozzle (21) forming the flare mouth member (24)
A pre-formed separate member similar to the above is placed in a predetermined position (5) at the time of mold installation and forming, and then a thermoplastic resin as a molded body material, ceramic or aluminum, etc. The mold is filled with molten metal.

In this way, the metal pipe material (22) or the piece member (23) and the flare mouth member (24) may have a groove-like groove (25) on the outer periphery of the part to be cast.
), uneven portions (26), or widened portions (27) that are optically processed to increase the contact area and increase the pull-out resistance.

〔Effect of the invention〕

As mentioned above, this invention uses a refrigerant on-off valve with a valve body in the form of a rotating valve stem, and the strength of the main part is Vl 00, t/l=L 1, compared to a valve body with a screw propulsion type valve stem. /40, therefore, the basic technical idea is that it is possible to use a material that has the strength of the material that composes the valve body. In addition, if the valve stem to be inserted into the valve chamber of the valve body to be formed is placed around the periphery of the valve chamber, it is sufficient that the main shape of the valve chamber into which the valve stem is inserted is simply cylindrical, and it is sufficient to form a valve stem that is inserted into the valve chamber of the conventional valve chamber. There is no need for complicated cutting processes and ultra-precision finishing for screws, valve seats, etc. It became possible to mold the body with a metal mold.

This has made it possible to reduce the monthly raw material cost to about 1/10 of the previous cost, and the manufacturing cost for each process to about 115 to 1/10, making the valve body available to the world at a much lower price than the previous valve body. It is an effective thing that can be done.

[Brief explanation of the drawing]

Figure 1 is a basic sectional view of a mold, Figure 2 is a basic sectional view of a mold with a different configuration of the object to be molded, and Figure 3 is a diagram of a molded object molded with the mold shown in Figure 1. 4 is a cross-sectional view of a molded body molded with the mold shown in Figure 2, Figure 5 is a cross-sectional view of the mold with an insert part installed in the mold before filling with material, and Figure 6 is a divided view. A cross-sectional view of the mold showing the state in which a fluid passage is formed using the mold, Figure 7 is a cross-sectional view of the molded body of the part molded in Figure 6, and Figure 8 is a cross-sectional view of the metal pipe material to be inserted into the molded body. 8A is a cross-sectional view with an annular groove provided on the outer periphery of the end, FIG. 8B is a cross-sectional view with an uneven portion formed on the outer periphery of the end, and FIG. 8C is a cross-sectional view with an enlarged opening formed on the outer periphery of the end. 9 is a partial sectional view of the flared mouth member inserted into the molded body, FIG. 10 is a sectional view of the piece member, and FIG. 11 is a sectional view of the piece member. (10)...Top surface, (11)...Valve stem insertion port, (1
2)...Valve chamber, (13)...Low pressure refrigerant inlet, (
14)...Outlet port, (15)...High pressure refrigerant inlet port, (16)...Outlet port, (19)...Male thread, (2
0)...Fluid passage, (22)...Metal pipe material, (23
)...piece member, (24)...flare mouth member, (2
5)... Annular groove, (26)... Uneven part, (27)
... widening part. Patent applicant: Hiroshige Sangyo Co., Ltd. Procedural amendment (voluntary) November 1, 1988, Mr. Bunki Yoshida, Director General of the Special Fraud Office1, Indication of the case, 1982 Patent Application No. 1825782, Name of the invention: Air-conditioning/heating machine 3, Relation to the case of the person making the amendment Patent applicant address: 764 Tsuji, Hatogaya City, Saitama Name: Hiroshige Sangyo Co., Ltd. 4, Agent Address: Kaji, Chiyoda-ku, Tokyo 101 Town 2-4-1 (
Saeki Building 4th floor) Location (252) 25517, Section 8 of the detailed description of the invention in the specification to be amended, Contents of the amendment as shown in attached sheet 9, Attachment 1゛ Category or list of attached objects (1) Amendment! : 1 copy (2) Request for application examination 1 copy Showa year
Month/Date Correction: November 11, 1988 There were some errors in the specification of Japanese Patent Application No. 182578, so the corrections are made as follows. Note 1. In the specification, page 7, line 11, "required circuit torque" is corrected to "required rotational torque."

Claims (1)

[Scope of Claims] [1] A refrigerant opening/closing device in which a low-pressure refrigerant inlet and outlet and a high-pressure refrigerant inlet and outlet are communicated from the outside with a valve chamber having a valve stem insertion port on the upper surface. A method of manufacturing a valve body of a refrigerant on-off valve for an air-conditioning/heating machine, characterized in that the valve body is made of thermoplastic resin, ceramic, or molten metal and molded with a mold. [2] In the valve chamber with a valve stem insertion port on the top surface, in addition to each port connected to the pipe line forming the refrigerant circuit, such as a low-pressure refrigerant inlet and outlet, and a high-pressure refrigerant inlet and outlet, The refrigerant on-off valve body is made of thermoplastic resin, ceramic, or molten metal and is molded with a mold, and the fluid passage for the purpose of replenishing refrigerant or venting air is opened at the tip of a nozzle that protrudes from the outer periphery of the valve body. 2. A method for manufacturing a valve body of a refrigerant on-off valve in an air-conditioning/heating machine according to claim 1. [3] At each inlet and outlet for low-pressure refrigerant and high-pressure refrigerant, screw the female thread of a flare nut onto the end and outer periphery of a short and small metal tube to connect to the pipe line forming the refrigerant circuit. A flared port member having a male screw that can be formed is installed in advance in a mold at a position forming each of the inlet port and the outlet port, and the refrigerant on-off valve body is molded using a thermoplastic resin, ceramic, or molten metal as a material. 3. A method for manufacturing a valve body of a refrigerant on-off valve in an air-conditioning/heating machine according to claim 1 or 2, characterized in that: [4] At each inlet and outlet for low-pressure refrigerant and high-pressure refrigerant, a cylinder that can be easily connected to the end of a pipe line forming a refrigerant circuit or to a short or small metal pipe connected to the end of the pipe line. A flare port member having a male thread that can be screwed into the female thread of the flare nut is installed at the end and outer periphery of the shaped piece member in advance at a position forming each of the inlet and outlet in the mold to open and close the refrigerant. 3. The method of manufacturing a valve body of a refrigerant on-off valve in an air-conditioning/heating machine according to claim 1 or 2, wherein the valve body is formed by molding a thermoplastic resin, ceramic, or molten metal as a material. [5] Short and small metal pipes connected to the conduits forming the refrigerant circuit, or piece members connectable to the conduits of the circuit or the metal pipes, at the inlet and outlet ports for low-pressure refrigerant and high-pressure refrigerant, respectively. and a flare mouth member that has a male thread on the outer periphery that can be screwed into the female thread of a flare nut, and has an uneven part, an annular groove, or an enlarged part on the outer periphery of the part that is embedded in the valve body to increase the contact area. 5. The method of manufacturing a valve body of a refrigerant on/off valve in an air-conditioning/heating machine according to claim 3 or 4, characterized in that the phenomenon of removal from the valve body can be prevented.