JPH0243020Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a condensing pressure regulating valve that can be set to either high or low set pressure, in exchange for improving the pressure setting device of the condensing pressure regulating valve used in the refrigeration cycle. It is.

A condensing pressure regulating valve is a unit with an air-cooled condenser, and is used in applications that are operated throughout the year (e.g. refrigerators, storage cases, etc.), and is used to control condensing pressure so that it does not fall below a set value. This is the purpose. To explain the general operation, in the refrigeration cycle shown in Fig. 2, high-pressure refrigerant gas discharged from the compressor C normally passes from the condenser K to the valve port A ₂ →A ₃ of the condensing pressure regulating valve A. A flow path is taken from the liquid receiver S to the expansion valve Open port A ₁ → A ₃ (A ₂ −
A ₃ closed) The refrigerant gas enters the liquid receiver S, but in this case, the refrigerant gas is also supplied to the condenser K and liquefied, so the effective area of the condenser K decreases and the pressure increases, and this pressure increase Press down the counter spring with
It operates to return to the normal state of A ₂ - _{A 3} open (A ₁ - _{A 3} closed). In other words, the condensing pressure regulating valve A increases or decreases the effective area of the condenser and adjusts the condenser pressure appropriately. It is something to be retained. By the way, the set pressure of the condensing pressure regulating valve A is determined by the type of refrigerant used in the refrigeration cycle, and refrigerant R-12 has a standard pressure of 7.
±0.6Kg/cm ² G, R-22, and R502 are 13.5
It is defined as ±1.3Kg/cm ² G. Therefore, if you know from the beginning which refrigerant to use, you can set the pressure to the one determined for that refrigerant. The method used was to prepare two types of set pressures and exchange them depending on the refrigerant used, but in order to exchange them, the condensing pressure regulating valve A had to be removed from the piping, and the desired setting pressure had to be removed. This used to require the complicated labor of putting things on.

The purpose of the present invention is to use one condensing pressure regulating valve that can be set to a higher set pressure and then changed to a lower set pressure.

The structure of the present invention is to counteract the gas pressure at the set pressure sealed in the filling chamber of the condensing pressure regulating valve A with the gas pressure on the discharge side of the compressor via a diaphragm, and the valve shaft moves up and down in response to the movement of the diaphragm. In the condensing pressure regulating valve, which comprises a counter spring that biases the valve body so that it is always in contact with the valve stem, a check valve that communicates with the gas filling chamber is provided on the outer wall of the filling chamber, and the check valve is filled with gas. a valve body that opens and closes a flow path to the chamber;
A spring that biases the valve body in a direction to close the flow path, an adjustment screw that adjusts the elasticity of the spring, and a discharge path that discharges the gas filled in the containment chamber to the atmosphere through the flow path when the valve body is opened. and a removable cap that forcibly opens and closes the discharge passage.

With the above configuration, after adjusting the adjustment screw of the check valve and setting the elasticity of the spring to the lower set pressure, tighten the cap tightly to close the discharge passage, and then adjust the pressure to the next higher set pressure. Gas is sealed in the filling chamber. In this state, the valve body of the check valve opens the flow path, but the discharge path is forcibly closed by the cap, so the pressure inside the containment chamber is at the higher set pressure. It can be used for higher set pressure. If you want to change to a lower set pressure, remove the cap or loosen the cap, and the gas will escape into the atmosphere from the exhaust path, and the gas pressure in the containment chamber will gradually decrease until it reaches the lower set pressure. Then, under the action of the adjustment spring of the check valve, the check valve body closes the flow path to the gas charging chamber, and the gas pressure in the charging chamber is maintained at the lower set pressure.The cap is then tightened again and the lower setting pressure is maintained. It can be used for setting pressure.

As mentioned above, this invention makes it possible to use the high pressure setting as well as the low pressure setting by installing a check valve in the sealing chamber. It is very suitable for use when converting from setting to low pressure setting.

Embodiments of the present invention will be described below based on the drawings.
Figure 1 shows a cross-sectional view of an embodiment of the present invention.
The valve body 7 has a connecting pipe _A1 connected to the compressor discharge pipe.
A connecting pipe A ₂ connected to the condenser outlet and a connecting pipe A ₃ connected to the receiver inlet are provided, and these correspond to the numbers of the condensing pressure regulating valve A shown in the refrigeration cycle of FIG. 2. A valve element 8 that selectively opens and closes the valve seat 7a communicating the connecting pipes _A1 - _A3 or the valve seat 10a communicating the connecting pipes _A2 - _A3 is connected to the connecting pipe _A2 and is screwed into the valve body 7. A counter spring 9 interposed between the bottom cap 10 and the matching bottom cap 10 constantly biases the valve seat 7a in a direction to close it. At the upper end of the valve body 7, there is a lower cover 5 that is screwed into the blind hole 7b, and a periphery between the upper cover 2, which is attached above the lower cover 5 and whose periphery is airtightly fixed to the lower cover, and the periphery between the upper cover and the lower cover. A diaphragm 3 is provided which clamps the inside and partitions the inside into an upper chamber C and a lower chamber B, and the diaphragm 3
A valve stem 6 is provided between the abutment 14 and the valve body 8, which abut on the lower surface of the valve body 8, with both ends of the stem abutting the abutment or the valve body, respectively, and passing through the valve body. Lower room B
A communication hole 7c is provided to communicate the flow path of the connecting pipe A1 with the flow path of the connecting pipe _A1 . A gas-filled chamber R is airtightly formed with a hemispherical shell 1 on the outside of the upper lid 2, and the gas-filled chamber R and the upper chamber C are electrically connected through a hole 13. A thin tube that encloses pressurized gas.
The tip of the capillary tube is sealed after gas is filled.

Above the hemispherical shell 1 is a check valve body 17.
A check valve element 18 is provided inside the check valve main body to open and close the flow path 17a. It includes an adjustment spring 20 that urges the check valve body 18 in a direction to close the flow path, a valve receiver 19 that adjusts the elasticity of the adjustment spring, and an adjustment screw 21, and is screwed onto the outer surface of the check valve body 17 to close the discharge path. A removable cap 23 is provided to open and close the opening of the cap 17b.

For the check valve, set the adjustment spring to the lower set pressure (for example, 7 ± 0.6 Kg/cm ² ), and then close the cap 2.
3 is closed, gas is sealed in the filling chamber R and raised to a higher set pressure (for example, 13.5±1.3 Kg/cm ² ). When using the compressor in this condition, set the higher pressure of the compressor discharge gas pressure (e.g.
13.5±1.3Kg/cm ² ), the diaphragm 3 bulges in the direction of the upper chamber C, the valve shaft 6 and the valve body 8 are moved upward by the spring 9, and the valve body 8 touches the valve seat 7a. is closed and the valve seat 10a is opened, and the refrigerant flows through the valve port A ₂ -
A ₃ It becomes a normal flow path for distribution. Conversely, when the compressor discharge gas pressure becomes less than the set value, the diaphragm 3 expands toward the lower chamber B, and pushes the valve body 8 downward through the valve shaft 6 against the elasticity of the opposing spring 9, thereby pressing the valve seat 10a. is closed, the valve seat 7a is opened, and the refrigerant enters the flow path of the valve ports _A1 to _A3 .

Next, when changing the set value to a lower value, loosen the cap 23 of the check valve. Since the valve body 18 of the check valve is already open, the gas in the sealing chamber will pass through the flow path 17a and the discharge path 17b to the outside. is discharged to lower the pressure, and the lower set pressure (Example 7+
0.6Kg/cm ² ), the valve body 18 closes the flow path 17a,
The pressure in the containment chamber is maintained at the lower set pressure, the compressor discharge gas pressure opposes the lower set pressure, and the valve is opened and closed in the same manner as in the case of the higher set pressure described above.

As described above, the present invention has a structure in which a check valve is attached to the sealing chamber of the condensing pressure regulating valve, and changing from a higher set pressure to a lower set pressure can be done by simply operating the check valve cap. Therefore, the set pressure can be changed immediately after the regulating valve is installed on the piping, which has the effect of significantly reducing on-site work compared to replacing the conventional regulating valve. It is something. In addition, the pressure setting mechanism using the check valve of the present invention can be applied as is to other condensing pressure regulating valves, such as constant pressure expansion valves, etc., where the set pressure of the sealed gas is changed. It is something.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 shows an example of a refrigeration cycle using the present invention. DESCRIPTION OF SYMBOLS 1...Shell, 2...Upper cover, 5...Lower cover, 3...Diaphragm, 7...Valve body, 8...Valve body, 9...
Counter spring, 17...Check valve body, 18...Check valve body, 23...Cap.

Claims (1)

[Scope of utility model registration request] A valve body that has a discharge passage connected to the atmosphere outside the gas filling chamber for pressure setting of the condensation pressure regulating valve through a flow path that leads to the filling chamber, and opens and closes the flow path in opposition to the gas pressure in the filling chamber. A condensing pressure regulating valve comprising: a check valve having a spring adjusting mechanism for regulating the closing pressure of a valve body; and a removable cap for forcibly opening and closing a discharge passage opening of the check valve.